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library/rsa.c@0:cdf462088d13, 2017-01-05 (annotated)
- Committer:
- markrad
- Date:
- Thu Jan 05 00:18:44 2017 +0000
- Revision:
- 0:cdf462088d13
Initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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markrad | 0:cdf462088d13 | 1 | /* |
markrad | 0:cdf462088d13 | 2 | * The RSA public-key cryptosystem |
markrad | 0:cdf462088d13 | 3 | * |
markrad | 0:cdf462088d13 | 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved |
markrad | 0:cdf462088d13 | 5 | * SPDX-License-Identifier: Apache-2.0 |
markrad | 0:cdf462088d13 | 6 | * |
markrad | 0:cdf462088d13 | 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may |
markrad | 0:cdf462088d13 | 8 | * not use this file except in compliance with the License. |
markrad | 0:cdf462088d13 | 9 | * You may obtain a copy of the License at |
markrad | 0:cdf462088d13 | 10 | * |
markrad | 0:cdf462088d13 | 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
markrad | 0:cdf462088d13 | 12 | * |
markrad | 0:cdf462088d13 | 13 | * Unless required by applicable law or agreed to in writing, software |
markrad | 0:cdf462088d13 | 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
markrad | 0:cdf462088d13 | 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
markrad | 0:cdf462088d13 | 16 | * See the License for the specific language governing permissions and |
markrad | 0:cdf462088d13 | 17 | * limitations under the License. |
markrad | 0:cdf462088d13 | 18 | * |
markrad | 0:cdf462088d13 | 19 | * This file is part of mbed TLS (https://tls.mbed.org) |
markrad | 0:cdf462088d13 | 20 | */ |
markrad | 0:cdf462088d13 | 21 | /* |
markrad | 0:cdf462088d13 | 22 | * The following sources were referenced in the design of this implementation |
markrad | 0:cdf462088d13 | 23 | * of the RSA algorithm: |
markrad | 0:cdf462088d13 | 24 | * |
markrad | 0:cdf462088d13 | 25 | * [1] A method for obtaining digital signatures and public-key cryptosystems |
markrad | 0:cdf462088d13 | 26 | * R Rivest, A Shamir, and L Adleman |
markrad | 0:cdf462088d13 | 27 | * http://people.csail.mit.edu/rivest/pubs.html#RSA78 |
markrad | 0:cdf462088d13 | 28 | * |
markrad | 0:cdf462088d13 | 29 | * [2] Handbook of Applied Cryptography - 1997, Chapter 8 |
markrad | 0:cdf462088d13 | 30 | * Menezes, van Oorschot and Vanstone |
markrad | 0:cdf462088d13 | 31 | * |
markrad | 0:cdf462088d13 | 32 | */ |
markrad | 0:cdf462088d13 | 33 | |
markrad | 0:cdf462088d13 | 34 | #if !defined(MBEDTLS_CONFIG_FILE) |
markrad | 0:cdf462088d13 | 35 | #include "mbedtls/config.h" |
markrad | 0:cdf462088d13 | 36 | #else |
markrad | 0:cdf462088d13 | 37 | #include MBEDTLS_CONFIG_FILE |
markrad | 0:cdf462088d13 | 38 | #endif |
markrad | 0:cdf462088d13 | 39 | |
markrad | 0:cdf462088d13 | 40 | #if defined(MBEDTLS_RSA_C) |
markrad | 0:cdf462088d13 | 41 | |
markrad | 0:cdf462088d13 | 42 | #include "mbedtls/rsa.h" |
markrad | 0:cdf462088d13 | 43 | #include "mbedtls/oid.h" |
markrad | 0:cdf462088d13 | 44 | |
markrad | 0:cdf462088d13 | 45 | #include <string.h> |
markrad | 0:cdf462088d13 | 46 | |
markrad | 0:cdf462088d13 | 47 | #if defined(MBEDTLS_PKCS1_V21) |
markrad | 0:cdf462088d13 | 48 | #include "mbedtls/md.h" |
markrad | 0:cdf462088d13 | 49 | #endif |
markrad | 0:cdf462088d13 | 50 | |
markrad | 0:cdf462088d13 | 51 | #if defined(MBEDTLS_PKCS1_V15) && !defined(__OpenBSD__) |
markrad | 0:cdf462088d13 | 52 | #include <stdlib.h> |
markrad | 0:cdf462088d13 | 53 | #endif |
markrad | 0:cdf462088d13 | 54 | |
markrad | 0:cdf462088d13 | 55 | #if defined(MBEDTLS_PLATFORM_C) |
markrad | 0:cdf462088d13 | 56 | #include "mbedtls/platform.h" |
markrad | 0:cdf462088d13 | 57 | #else |
markrad | 0:cdf462088d13 | 58 | #include <stdio.h> |
markrad | 0:cdf462088d13 | 59 | #define mbedtls_printf printf |
markrad | 0:cdf462088d13 | 60 | #define mbedtls_calloc calloc |
markrad | 0:cdf462088d13 | 61 | #define mbedtls_free free |
markrad | 0:cdf462088d13 | 62 | #endif |
markrad | 0:cdf462088d13 | 63 | |
markrad | 0:cdf462088d13 | 64 | /* |
markrad | 0:cdf462088d13 | 65 | * Initialize an RSA context |
markrad | 0:cdf462088d13 | 66 | */ |
markrad | 0:cdf462088d13 | 67 | void mbedtls_rsa_init( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 68 | int padding, |
markrad | 0:cdf462088d13 | 69 | int hash_id ) |
markrad | 0:cdf462088d13 | 70 | { |
markrad | 0:cdf462088d13 | 71 | memset( ctx, 0, sizeof( mbedtls_rsa_context ) ); |
markrad | 0:cdf462088d13 | 72 | |
markrad | 0:cdf462088d13 | 73 | mbedtls_rsa_set_padding( ctx, padding, hash_id ); |
markrad | 0:cdf462088d13 | 74 | |
markrad | 0:cdf462088d13 | 75 | #if defined(MBEDTLS_THREADING_C) |
markrad | 0:cdf462088d13 | 76 | mbedtls_mutex_init( &ctx->mutex ); |
markrad | 0:cdf462088d13 | 77 | #endif |
markrad | 0:cdf462088d13 | 78 | } |
markrad | 0:cdf462088d13 | 79 | |
markrad | 0:cdf462088d13 | 80 | /* |
markrad | 0:cdf462088d13 | 81 | * Set padding for an existing RSA context |
markrad | 0:cdf462088d13 | 82 | */ |
markrad | 0:cdf462088d13 | 83 | void mbedtls_rsa_set_padding( mbedtls_rsa_context *ctx, int padding, int hash_id ) |
markrad | 0:cdf462088d13 | 84 | { |
markrad | 0:cdf462088d13 | 85 | ctx->padding = padding; |
markrad | 0:cdf462088d13 | 86 | ctx->hash_id = hash_id; |
markrad | 0:cdf462088d13 | 87 | } |
markrad | 0:cdf462088d13 | 88 | |
markrad | 0:cdf462088d13 | 89 | #if defined(MBEDTLS_GENPRIME) |
markrad | 0:cdf462088d13 | 90 | |
markrad | 0:cdf462088d13 | 91 | /* |
markrad | 0:cdf462088d13 | 92 | * Generate an RSA keypair |
markrad | 0:cdf462088d13 | 93 | */ |
markrad | 0:cdf462088d13 | 94 | int mbedtls_rsa_gen_key( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 95 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 96 | void *p_rng, |
markrad | 0:cdf462088d13 | 97 | unsigned int nbits, int exponent ) |
markrad | 0:cdf462088d13 | 98 | { |
markrad | 0:cdf462088d13 | 99 | int ret; |
markrad | 0:cdf462088d13 | 100 | mbedtls_mpi P1, Q1, H, G; |
markrad | 0:cdf462088d13 | 101 | |
markrad | 0:cdf462088d13 | 102 | if( f_rng == NULL || nbits < 128 || exponent < 3 ) |
markrad | 0:cdf462088d13 | 103 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 104 | |
markrad | 0:cdf462088d13 | 105 | if( nbits % 2 ) |
markrad | 0:cdf462088d13 | 106 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 107 | |
markrad | 0:cdf462088d13 | 108 | mbedtls_mpi_init( &P1 ); mbedtls_mpi_init( &Q1 ); |
markrad | 0:cdf462088d13 | 109 | mbedtls_mpi_init( &H ); mbedtls_mpi_init( &G ); |
markrad | 0:cdf462088d13 | 110 | |
markrad | 0:cdf462088d13 | 111 | /* |
markrad | 0:cdf462088d13 | 112 | * find primes P and Q with Q < P so that: |
markrad | 0:cdf462088d13 | 113 | * GCD( E, (P-1)*(Q-1) ) == 1 |
markrad | 0:cdf462088d13 | 114 | */ |
markrad | 0:cdf462088d13 | 115 | MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &ctx->E, exponent ) ); |
markrad | 0:cdf462088d13 | 116 | |
markrad | 0:cdf462088d13 | 117 | do |
markrad | 0:cdf462088d13 | 118 | { |
markrad | 0:cdf462088d13 | 119 | MBEDTLS_MPI_CHK( mbedtls_mpi_gen_prime( &ctx->P, nbits >> 1, 0, |
markrad | 0:cdf462088d13 | 120 | f_rng, p_rng ) ); |
markrad | 0:cdf462088d13 | 121 | |
markrad | 0:cdf462088d13 | 122 | MBEDTLS_MPI_CHK( mbedtls_mpi_gen_prime( &ctx->Q, nbits >> 1, 0, |
markrad | 0:cdf462088d13 | 123 | f_rng, p_rng ) ); |
markrad | 0:cdf462088d13 | 124 | |
markrad | 0:cdf462088d13 | 125 | if( mbedtls_mpi_cmp_mpi( &ctx->P, &ctx->Q ) == 0 ) |
markrad | 0:cdf462088d13 | 126 | continue; |
markrad | 0:cdf462088d13 | 127 | |
markrad | 0:cdf462088d13 | 128 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->N, &ctx->P, &ctx->Q ) ); |
markrad | 0:cdf462088d13 | 129 | if( mbedtls_mpi_bitlen( &ctx->N ) != nbits ) |
markrad | 0:cdf462088d13 | 130 | continue; |
markrad | 0:cdf462088d13 | 131 | |
markrad | 0:cdf462088d13 | 132 | if( mbedtls_mpi_cmp_mpi( &ctx->P, &ctx->Q ) < 0 ) |
markrad | 0:cdf462088d13 | 133 | mbedtls_mpi_swap( &ctx->P, &ctx->Q ); |
markrad | 0:cdf462088d13 | 134 | |
markrad | 0:cdf462088d13 | 135 | MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &P1, &ctx->P, 1 ) ); |
markrad | 0:cdf462088d13 | 136 | MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &Q1, &ctx->Q, 1 ) ); |
markrad | 0:cdf462088d13 | 137 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &H, &P1, &Q1 ) ); |
markrad | 0:cdf462088d13 | 138 | MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &G, &ctx->E, &H ) ); |
markrad | 0:cdf462088d13 | 139 | } |
markrad | 0:cdf462088d13 | 140 | while( mbedtls_mpi_cmp_int( &G, 1 ) != 0 ); |
markrad | 0:cdf462088d13 | 141 | |
markrad | 0:cdf462088d13 | 142 | /* |
markrad | 0:cdf462088d13 | 143 | * D = E^-1 mod ((P-1)*(Q-1)) |
markrad | 0:cdf462088d13 | 144 | * DP = D mod (P - 1) |
markrad | 0:cdf462088d13 | 145 | * DQ = D mod (Q - 1) |
markrad | 0:cdf462088d13 | 146 | * QP = Q^-1 mod P |
markrad | 0:cdf462088d13 | 147 | */ |
markrad | 0:cdf462088d13 | 148 | MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->D , &ctx->E, &H ) ); |
markrad | 0:cdf462088d13 | 149 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->DP, &ctx->D, &P1 ) ); |
markrad | 0:cdf462088d13 | 150 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->DQ, &ctx->D, &Q1 ) ); |
markrad | 0:cdf462088d13 | 151 | MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->QP, &ctx->Q, &ctx->P ) ); |
markrad | 0:cdf462088d13 | 152 | |
markrad | 0:cdf462088d13 | 153 | ctx->len = ( mbedtls_mpi_bitlen( &ctx->N ) + 7 ) >> 3; |
markrad | 0:cdf462088d13 | 154 | |
markrad | 0:cdf462088d13 | 155 | cleanup: |
markrad | 0:cdf462088d13 | 156 | |
markrad | 0:cdf462088d13 | 157 | mbedtls_mpi_free( &P1 ); mbedtls_mpi_free( &Q1 ); mbedtls_mpi_free( &H ); mbedtls_mpi_free( &G ); |
markrad | 0:cdf462088d13 | 158 | |
markrad | 0:cdf462088d13 | 159 | if( ret != 0 ) |
markrad | 0:cdf462088d13 | 160 | { |
markrad | 0:cdf462088d13 | 161 | mbedtls_rsa_free( ctx ); |
markrad | 0:cdf462088d13 | 162 | return( MBEDTLS_ERR_RSA_KEY_GEN_FAILED + ret ); |
markrad | 0:cdf462088d13 | 163 | } |
markrad | 0:cdf462088d13 | 164 | |
markrad | 0:cdf462088d13 | 165 | return( 0 ); |
markrad | 0:cdf462088d13 | 166 | } |
markrad | 0:cdf462088d13 | 167 | |
markrad | 0:cdf462088d13 | 168 | #endif /* MBEDTLS_GENPRIME */ |
markrad | 0:cdf462088d13 | 169 | |
markrad | 0:cdf462088d13 | 170 | /* |
markrad | 0:cdf462088d13 | 171 | * Check a public RSA key |
markrad | 0:cdf462088d13 | 172 | */ |
markrad | 0:cdf462088d13 | 173 | int mbedtls_rsa_check_pubkey( const mbedtls_rsa_context *ctx ) |
markrad | 0:cdf462088d13 | 174 | { |
markrad | 0:cdf462088d13 | 175 | if( !ctx->N.p || !ctx->E.p ) |
markrad | 0:cdf462088d13 | 176 | return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED ); |
markrad | 0:cdf462088d13 | 177 | |
markrad | 0:cdf462088d13 | 178 | if( ( ctx->N.p[0] & 1 ) == 0 || |
markrad | 0:cdf462088d13 | 179 | ( ctx->E.p[0] & 1 ) == 0 ) |
markrad | 0:cdf462088d13 | 180 | return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED ); |
markrad | 0:cdf462088d13 | 181 | |
markrad | 0:cdf462088d13 | 182 | if( mbedtls_mpi_bitlen( &ctx->N ) < 128 || |
markrad | 0:cdf462088d13 | 183 | mbedtls_mpi_bitlen( &ctx->N ) > MBEDTLS_MPI_MAX_BITS ) |
markrad | 0:cdf462088d13 | 184 | return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED ); |
markrad | 0:cdf462088d13 | 185 | |
markrad | 0:cdf462088d13 | 186 | if( mbedtls_mpi_bitlen( &ctx->E ) < 2 || |
markrad | 0:cdf462088d13 | 187 | mbedtls_mpi_cmp_mpi( &ctx->E, &ctx->N ) >= 0 ) |
markrad | 0:cdf462088d13 | 188 | return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED ); |
markrad | 0:cdf462088d13 | 189 | |
markrad | 0:cdf462088d13 | 190 | return( 0 ); |
markrad | 0:cdf462088d13 | 191 | } |
markrad | 0:cdf462088d13 | 192 | |
markrad | 0:cdf462088d13 | 193 | /* |
markrad | 0:cdf462088d13 | 194 | * Check a private RSA key |
markrad | 0:cdf462088d13 | 195 | */ |
markrad | 0:cdf462088d13 | 196 | int mbedtls_rsa_check_privkey( const mbedtls_rsa_context *ctx ) |
markrad | 0:cdf462088d13 | 197 | { |
markrad | 0:cdf462088d13 | 198 | int ret; |
markrad | 0:cdf462088d13 | 199 | mbedtls_mpi PQ, DE, P1, Q1, H, I, G, G2, L1, L2, DP, DQ, QP; |
markrad | 0:cdf462088d13 | 200 | |
markrad | 0:cdf462088d13 | 201 | if( ( ret = mbedtls_rsa_check_pubkey( ctx ) ) != 0 ) |
markrad | 0:cdf462088d13 | 202 | return( ret ); |
markrad | 0:cdf462088d13 | 203 | |
markrad | 0:cdf462088d13 | 204 | if( !ctx->P.p || !ctx->Q.p || !ctx->D.p ) |
markrad | 0:cdf462088d13 | 205 | return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED ); |
markrad | 0:cdf462088d13 | 206 | |
markrad | 0:cdf462088d13 | 207 | mbedtls_mpi_init( &PQ ); mbedtls_mpi_init( &DE ); mbedtls_mpi_init( &P1 ); mbedtls_mpi_init( &Q1 ); |
markrad | 0:cdf462088d13 | 208 | mbedtls_mpi_init( &H ); mbedtls_mpi_init( &I ); mbedtls_mpi_init( &G ); mbedtls_mpi_init( &G2 ); |
markrad | 0:cdf462088d13 | 209 | mbedtls_mpi_init( &L1 ); mbedtls_mpi_init( &L2 ); mbedtls_mpi_init( &DP ); mbedtls_mpi_init( &DQ ); |
markrad | 0:cdf462088d13 | 210 | mbedtls_mpi_init( &QP ); |
markrad | 0:cdf462088d13 | 211 | |
markrad | 0:cdf462088d13 | 212 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &PQ, &ctx->P, &ctx->Q ) ); |
markrad | 0:cdf462088d13 | 213 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &DE, &ctx->D, &ctx->E ) ); |
markrad | 0:cdf462088d13 | 214 | MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &P1, &ctx->P, 1 ) ); |
markrad | 0:cdf462088d13 | 215 | MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &Q1, &ctx->Q, 1 ) ); |
markrad | 0:cdf462088d13 | 216 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &H, &P1, &Q1 ) ); |
markrad | 0:cdf462088d13 | 217 | MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &G, &ctx->E, &H ) ); |
markrad | 0:cdf462088d13 | 218 | |
markrad | 0:cdf462088d13 | 219 | MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &G2, &P1, &Q1 ) ); |
markrad | 0:cdf462088d13 | 220 | MBEDTLS_MPI_CHK( mbedtls_mpi_div_mpi( &L1, &L2, &H, &G2 ) ); |
markrad | 0:cdf462088d13 | 221 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &I, &DE, &L1 ) ); |
markrad | 0:cdf462088d13 | 222 | |
markrad | 0:cdf462088d13 | 223 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &DP, &ctx->D, &P1 ) ); |
markrad | 0:cdf462088d13 | 224 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &DQ, &ctx->D, &Q1 ) ); |
markrad | 0:cdf462088d13 | 225 | MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &QP, &ctx->Q, &ctx->P ) ); |
markrad | 0:cdf462088d13 | 226 | /* |
markrad | 0:cdf462088d13 | 227 | * Check for a valid PKCS1v2 private key |
markrad | 0:cdf462088d13 | 228 | */ |
markrad | 0:cdf462088d13 | 229 | if( mbedtls_mpi_cmp_mpi( &PQ, &ctx->N ) != 0 || |
markrad | 0:cdf462088d13 | 230 | mbedtls_mpi_cmp_mpi( &DP, &ctx->DP ) != 0 || |
markrad | 0:cdf462088d13 | 231 | mbedtls_mpi_cmp_mpi( &DQ, &ctx->DQ ) != 0 || |
markrad | 0:cdf462088d13 | 232 | mbedtls_mpi_cmp_mpi( &QP, &ctx->QP ) != 0 || |
markrad | 0:cdf462088d13 | 233 | mbedtls_mpi_cmp_int( &L2, 0 ) != 0 || |
markrad | 0:cdf462088d13 | 234 | mbedtls_mpi_cmp_int( &I, 1 ) != 0 || |
markrad | 0:cdf462088d13 | 235 | mbedtls_mpi_cmp_int( &G, 1 ) != 0 ) |
markrad | 0:cdf462088d13 | 236 | { |
markrad | 0:cdf462088d13 | 237 | ret = MBEDTLS_ERR_RSA_KEY_CHECK_FAILED; |
markrad | 0:cdf462088d13 | 238 | } |
markrad | 0:cdf462088d13 | 239 | |
markrad | 0:cdf462088d13 | 240 | cleanup: |
markrad | 0:cdf462088d13 | 241 | mbedtls_mpi_free( &PQ ); mbedtls_mpi_free( &DE ); mbedtls_mpi_free( &P1 ); mbedtls_mpi_free( &Q1 ); |
markrad | 0:cdf462088d13 | 242 | mbedtls_mpi_free( &H ); mbedtls_mpi_free( &I ); mbedtls_mpi_free( &G ); mbedtls_mpi_free( &G2 ); |
markrad | 0:cdf462088d13 | 243 | mbedtls_mpi_free( &L1 ); mbedtls_mpi_free( &L2 ); mbedtls_mpi_free( &DP ); mbedtls_mpi_free( &DQ ); |
markrad | 0:cdf462088d13 | 244 | mbedtls_mpi_free( &QP ); |
markrad | 0:cdf462088d13 | 245 | |
markrad | 0:cdf462088d13 | 246 | if( ret == MBEDTLS_ERR_RSA_KEY_CHECK_FAILED ) |
markrad | 0:cdf462088d13 | 247 | return( ret ); |
markrad | 0:cdf462088d13 | 248 | |
markrad | 0:cdf462088d13 | 249 | if( ret != 0 ) |
markrad | 0:cdf462088d13 | 250 | return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED + ret ); |
markrad | 0:cdf462088d13 | 251 | |
markrad | 0:cdf462088d13 | 252 | return( 0 ); |
markrad | 0:cdf462088d13 | 253 | } |
markrad | 0:cdf462088d13 | 254 | |
markrad | 0:cdf462088d13 | 255 | /* |
markrad | 0:cdf462088d13 | 256 | * Check if contexts holding a public and private key match |
markrad | 0:cdf462088d13 | 257 | */ |
markrad | 0:cdf462088d13 | 258 | int mbedtls_rsa_check_pub_priv( const mbedtls_rsa_context *pub, const mbedtls_rsa_context *prv ) |
markrad | 0:cdf462088d13 | 259 | { |
markrad | 0:cdf462088d13 | 260 | if( mbedtls_rsa_check_pubkey( pub ) != 0 || |
markrad | 0:cdf462088d13 | 261 | mbedtls_rsa_check_privkey( prv ) != 0 ) |
markrad | 0:cdf462088d13 | 262 | { |
markrad | 0:cdf462088d13 | 263 | return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED ); |
markrad | 0:cdf462088d13 | 264 | } |
markrad | 0:cdf462088d13 | 265 | |
markrad | 0:cdf462088d13 | 266 | if( mbedtls_mpi_cmp_mpi( &pub->N, &prv->N ) != 0 || |
markrad | 0:cdf462088d13 | 267 | mbedtls_mpi_cmp_mpi( &pub->E, &prv->E ) != 0 ) |
markrad | 0:cdf462088d13 | 268 | { |
markrad | 0:cdf462088d13 | 269 | return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED ); |
markrad | 0:cdf462088d13 | 270 | } |
markrad | 0:cdf462088d13 | 271 | |
markrad | 0:cdf462088d13 | 272 | return( 0 ); |
markrad | 0:cdf462088d13 | 273 | } |
markrad | 0:cdf462088d13 | 274 | |
markrad | 0:cdf462088d13 | 275 | /* |
markrad | 0:cdf462088d13 | 276 | * Do an RSA public key operation |
markrad | 0:cdf462088d13 | 277 | */ |
markrad | 0:cdf462088d13 | 278 | int mbedtls_rsa_public( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 279 | const unsigned char *input, |
markrad | 0:cdf462088d13 | 280 | unsigned char *output ) |
markrad | 0:cdf462088d13 | 281 | { |
markrad | 0:cdf462088d13 | 282 | int ret; |
markrad | 0:cdf462088d13 | 283 | size_t olen; |
markrad | 0:cdf462088d13 | 284 | mbedtls_mpi T; |
markrad | 0:cdf462088d13 | 285 | |
markrad | 0:cdf462088d13 | 286 | mbedtls_mpi_init( &T ); |
markrad | 0:cdf462088d13 | 287 | |
markrad | 0:cdf462088d13 | 288 | #if defined(MBEDTLS_THREADING_C) |
markrad | 0:cdf462088d13 | 289 | if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) |
markrad | 0:cdf462088d13 | 290 | return( ret ); |
markrad | 0:cdf462088d13 | 291 | #endif |
markrad | 0:cdf462088d13 | 292 | |
markrad | 0:cdf462088d13 | 293 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &T, input, ctx->len ) ); |
markrad | 0:cdf462088d13 | 294 | |
markrad | 0:cdf462088d13 | 295 | if( mbedtls_mpi_cmp_mpi( &T, &ctx->N ) >= 0 ) |
markrad | 0:cdf462088d13 | 296 | { |
markrad | 0:cdf462088d13 | 297 | ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA; |
markrad | 0:cdf462088d13 | 298 | goto cleanup; |
markrad | 0:cdf462088d13 | 299 | } |
markrad | 0:cdf462088d13 | 300 | |
markrad | 0:cdf462088d13 | 301 | olen = ctx->len; |
markrad | 0:cdf462088d13 | 302 | MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T, &T, &ctx->E, &ctx->N, &ctx->RN ) ); |
markrad | 0:cdf462088d13 | 303 | MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &T, output, olen ) ); |
markrad | 0:cdf462088d13 | 304 | |
markrad | 0:cdf462088d13 | 305 | cleanup: |
markrad | 0:cdf462088d13 | 306 | #if defined(MBEDTLS_THREADING_C) |
markrad | 0:cdf462088d13 | 307 | if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) |
markrad | 0:cdf462088d13 | 308 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); |
markrad | 0:cdf462088d13 | 309 | #endif |
markrad | 0:cdf462088d13 | 310 | |
markrad | 0:cdf462088d13 | 311 | mbedtls_mpi_free( &T ); |
markrad | 0:cdf462088d13 | 312 | |
markrad | 0:cdf462088d13 | 313 | if( ret != 0 ) |
markrad | 0:cdf462088d13 | 314 | return( MBEDTLS_ERR_RSA_PUBLIC_FAILED + ret ); |
markrad | 0:cdf462088d13 | 315 | |
markrad | 0:cdf462088d13 | 316 | return( 0 ); |
markrad | 0:cdf462088d13 | 317 | } |
markrad | 0:cdf462088d13 | 318 | |
markrad | 0:cdf462088d13 | 319 | /* |
markrad | 0:cdf462088d13 | 320 | * Generate or update blinding values, see section 10 of: |
markrad | 0:cdf462088d13 | 321 | * KOCHER, Paul C. Timing attacks on implementations of Diffie-Hellman, RSA, |
markrad | 0:cdf462088d13 | 322 | * DSS, and other systems. In : Advances in Cryptology-CRYPTO'96. Springer |
markrad | 0:cdf462088d13 | 323 | * Berlin Heidelberg, 1996. p. 104-113. |
markrad | 0:cdf462088d13 | 324 | */ |
markrad | 0:cdf462088d13 | 325 | static int rsa_prepare_blinding( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 326 | int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) |
markrad | 0:cdf462088d13 | 327 | { |
markrad | 0:cdf462088d13 | 328 | int ret, count = 0; |
markrad | 0:cdf462088d13 | 329 | |
markrad | 0:cdf462088d13 | 330 | if( ctx->Vf.p != NULL ) |
markrad | 0:cdf462088d13 | 331 | { |
markrad | 0:cdf462088d13 | 332 | /* We already have blinding values, just update them by squaring */ |
markrad | 0:cdf462088d13 | 333 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vi, &ctx->Vi, &ctx->Vi ) ); |
markrad | 0:cdf462088d13 | 334 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vi, &ctx->Vi, &ctx->N ) ); |
markrad | 0:cdf462088d13 | 335 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vf, &ctx->Vf, &ctx->Vf ) ); |
markrad | 0:cdf462088d13 | 336 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vf, &ctx->Vf, &ctx->N ) ); |
markrad | 0:cdf462088d13 | 337 | |
markrad | 0:cdf462088d13 | 338 | goto cleanup; |
markrad | 0:cdf462088d13 | 339 | } |
markrad | 0:cdf462088d13 | 340 | |
markrad | 0:cdf462088d13 | 341 | /* Unblinding value: Vf = random number, invertible mod N */ |
markrad | 0:cdf462088d13 | 342 | do { |
markrad | 0:cdf462088d13 | 343 | if( count++ > 10 ) |
markrad | 0:cdf462088d13 | 344 | return( MBEDTLS_ERR_RSA_RNG_FAILED ); |
markrad | 0:cdf462088d13 | 345 | |
markrad | 0:cdf462088d13 | 346 | MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->Vf, ctx->len - 1, f_rng, p_rng ) ); |
markrad | 0:cdf462088d13 | 347 | MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &ctx->Vi, &ctx->Vf, &ctx->N ) ); |
markrad | 0:cdf462088d13 | 348 | } while( mbedtls_mpi_cmp_int( &ctx->Vi, 1 ) != 0 ); |
markrad | 0:cdf462088d13 | 349 | |
markrad | 0:cdf462088d13 | 350 | /* Blinding value: Vi = Vf^(-e) mod N */ |
markrad | 0:cdf462088d13 | 351 | MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->Vi, &ctx->Vf, &ctx->N ) ); |
markrad | 0:cdf462088d13 | 352 | MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->Vi, &ctx->Vi, &ctx->E, &ctx->N, &ctx->RN ) ); |
markrad | 0:cdf462088d13 | 353 | |
markrad | 0:cdf462088d13 | 354 | |
markrad | 0:cdf462088d13 | 355 | cleanup: |
markrad | 0:cdf462088d13 | 356 | return( ret ); |
markrad | 0:cdf462088d13 | 357 | } |
markrad | 0:cdf462088d13 | 358 | |
markrad | 0:cdf462088d13 | 359 | /* |
markrad | 0:cdf462088d13 | 360 | * Do an RSA private key operation |
markrad | 0:cdf462088d13 | 361 | */ |
markrad | 0:cdf462088d13 | 362 | int mbedtls_rsa_private( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 363 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 364 | void *p_rng, |
markrad | 0:cdf462088d13 | 365 | const unsigned char *input, |
markrad | 0:cdf462088d13 | 366 | unsigned char *output ) |
markrad | 0:cdf462088d13 | 367 | { |
markrad | 0:cdf462088d13 | 368 | int ret; |
markrad | 0:cdf462088d13 | 369 | size_t olen; |
markrad | 0:cdf462088d13 | 370 | mbedtls_mpi T, T1, T2; |
markrad | 0:cdf462088d13 | 371 | |
markrad | 0:cdf462088d13 | 372 | /* Make sure we have private key info, prevent possible misuse */ |
markrad | 0:cdf462088d13 | 373 | if( ctx->P.p == NULL || ctx->Q.p == NULL || ctx->D.p == NULL ) |
markrad | 0:cdf462088d13 | 374 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 375 | |
markrad | 0:cdf462088d13 | 376 | mbedtls_mpi_init( &T ); mbedtls_mpi_init( &T1 ); mbedtls_mpi_init( &T2 ); |
markrad | 0:cdf462088d13 | 377 | |
markrad | 0:cdf462088d13 | 378 | #if defined(MBEDTLS_THREADING_C) |
markrad | 0:cdf462088d13 | 379 | if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) |
markrad | 0:cdf462088d13 | 380 | return( ret ); |
markrad | 0:cdf462088d13 | 381 | #endif |
markrad | 0:cdf462088d13 | 382 | |
markrad | 0:cdf462088d13 | 383 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &T, input, ctx->len ) ); |
markrad | 0:cdf462088d13 | 384 | if( mbedtls_mpi_cmp_mpi( &T, &ctx->N ) >= 0 ) |
markrad | 0:cdf462088d13 | 385 | { |
markrad | 0:cdf462088d13 | 386 | ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA; |
markrad | 0:cdf462088d13 | 387 | goto cleanup; |
markrad | 0:cdf462088d13 | 388 | } |
markrad | 0:cdf462088d13 | 389 | |
markrad | 0:cdf462088d13 | 390 | if( f_rng != NULL ) |
markrad | 0:cdf462088d13 | 391 | { |
markrad | 0:cdf462088d13 | 392 | /* |
markrad | 0:cdf462088d13 | 393 | * Blinding |
markrad | 0:cdf462088d13 | 394 | * T = T * Vi mod N |
markrad | 0:cdf462088d13 | 395 | */ |
markrad | 0:cdf462088d13 | 396 | MBEDTLS_MPI_CHK( rsa_prepare_blinding( ctx, f_rng, p_rng ) ); |
markrad | 0:cdf462088d13 | 397 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T, &T, &ctx->Vi ) ); |
markrad | 0:cdf462088d13 | 398 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &T, &T, &ctx->N ) ); |
markrad | 0:cdf462088d13 | 399 | } |
markrad | 0:cdf462088d13 | 400 | |
markrad | 0:cdf462088d13 | 401 | #if defined(MBEDTLS_RSA_NO_CRT) |
markrad | 0:cdf462088d13 | 402 | MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T, &T, &ctx->D, &ctx->N, &ctx->RN ) ); |
markrad | 0:cdf462088d13 | 403 | #else |
markrad | 0:cdf462088d13 | 404 | /* |
markrad | 0:cdf462088d13 | 405 | * faster decryption using the CRT |
markrad | 0:cdf462088d13 | 406 | * |
markrad | 0:cdf462088d13 | 407 | * T1 = input ^ dP mod P |
markrad | 0:cdf462088d13 | 408 | * T2 = input ^ dQ mod Q |
markrad | 0:cdf462088d13 | 409 | */ |
markrad | 0:cdf462088d13 | 410 | MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T1, &T, &ctx->DP, &ctx->P, &ctx->RP ) ); |
markrad | 0:cdf462088d13 | 411 | MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T2, &T, &ctx->DQ, &ctx->Q, &ctx->RQ ) ); |
markrad | 0:cdf462088d13 | 412 | |
markrad | 0:cdf462088d13 | 413 | /* |
markrad | 0:cdf462088d13 | 414 | * T = (T1 - T2) * (Q^-1 mod P) mod P |
markrad | 0:cdf462088d13 | 415 | */ |
markrad | 0:cdf462088d13 | 416 | MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( &T, &T1, &T2 ) ); |
markrad | 0:cdf462088d13 | 417 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T1, &T, &ctx->QP ) ); |
markrad | 0:cdf462088d13 | 418 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &T, &T1, &ctx->P ) ); |
markrad | 0:cdf462088d13 | 419 | |
markrad | 0:cdf462088d13 | 420 | /* |
markrad | 0:cdf462088d13 | 421 | * T = T2 + T * Q |
markrad | 0:cdf462088d13 | 422 | */ |
markrad | 0:cdf462088d13 | 423 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T1, &T, &ctx->Q ) ); |
markrad | 0:cdf462088d13 | 424 | MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &T, &T2, &T1 ) ); |
markrad | 0:cdf462088d13 | 425 | #endif /* MBEDTLS_RSA_NO_CRT */ |
markrad | 0:cdf462088d13 | 426 | |
markrad | 0:cdf462088d13 | 427 | if( f_rng != NULL ) |
markrad | 0:cdf462088d13 | 428 | { |
markrad | 0:cdf462088d13 | 429 | /* |
markrad | 0:cdf462088d13 | 430 | * Unblind |
markrad | 0:cdf462088d13 | 431 | * T = T * Vf mod N |
markrad | 0:cdf462088d13 | 432 | */ |
markrad | 0:cdf462088d13 | 433 | MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T, &T, &ctx->Vf ) ); |
markrad | 0:cdf462088d13 | 434 | MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &T, &T, &ctx->N ) ); |
markrad | 0:cdf462088d13 | 435 | } |
markrad | 0:cdf462088d13 | 436 | |
markrad | 0:cdf462088d13 | 437 | olen = ctx->len; |
markrad | 0:cdf462088d13 | 438 | MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &T, output, olen ) ); |
markrad | 0:cdf462088d13 | 439 | |
markrad | 0:cdf462088d13 | 440 | cleanup: |
markrad | 0:cdf462088d13 | 441 | #if defined(MBEDTLS_THREADING_C) |
markrad | 0:cdf462088d13 | 442 | if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) |
markrad | 0:cdf462088d13 | 443 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); |
markrad | 0:cdf462088d13 | 444 | #endif |
markrad | 0:cdf462088d13 | 445 | |
markrad | 0:cdf462088d13 | 446 | mbedtls_mpi_free( &T ); mbedtls_mpi_free( &T1 ); mbedtls_mpi_free( &T2 ); |
markrad | 0:cdf462088d13 | 447 | |
markrad | 0:cdf462088d13 | 448 | if( ret != 0 ) |
markrad | 0:cdf462088d13 | 449 | return( MBEDTLS_ERR_RSA_PRIVATE_FAILED + ret ); |
markrad | 0:cdf462088d13 | 450 | |
markrad | 0:cdf462088d13 | 451 | return( 0 ); |
markrad | 0:cdf462088d13 | 452 | } |
markrad | 0:cdf462088d13 | 453 | |
markrad | 0:cdf462088d13 | 454 | #if defined(MBEDTLS_PKCS1_V21) |
markrad | 0:cdf462088d13 | 455 | /** |
markrad | 0:cdf462088d13 | 456 | * Generate and apply the MGF1 operation (from PKCS#1 v2.1) to a buffer. |
markrad | 0:cdf462088d13 | 457 | * |
markrad | 0:cdf462088d13 | 458 | * \param dst buffer to mask |
markrad | 0:cdf462088d13 | 459 | * \param dlen length of destination buffer |
markrad | 0:cdf462088d13 | 460 | * \param src source of the mask generation |
markrad | 0:cdf462088d13 | 461 | * \param slen length of the source buffer |
markrad | 0:cdf462088d13 | 462 | * \param md_ctx message digest context to use |
markrad | 0:cdf462088d13 | 463 | */ |
markrad | 0:cdf462088d13 | 464 | static void mgf_mask( unsigned char *dst, size_t dlen, unsigned char *src, |
markrad | 0:cdf462088d13 | 465 | size_t slen, mbedtls_md_context_t *md_ctx ) |
markrad | 0:cdf462088d13 | 466 | { |
markrad | 0:cdf462088d13 | 467 | unsigned char mask[MBEDTLS_MD_MAX_SIZE]; |
markrad | 0:cdf462088d13 | 468 | unsigned char counter[4]; |
markrad | 0:cdf462088d13 | 469 | unsigned char *p; |
markrad | 0:cdf462088d13 | 470 | unsigned int hlen; |
markrad | 0:cdf462088d13 | 471 | size_t i, use_len; |
markrad | 0:cdf462088d13 | 472 | |
markrad | 0:cdf462088d13 | 473 | memset( mask, 0, MBEDTLS_MD_MAX_SIZE ); |
markrad | 0:cdf462088d13 | 474 | memset( counter, 0, 4 ); |
markrad | 0:cdf462088d13 | 475 | |
markrad | 0:cdf462088d13 | 476 | hlen = mbedtls_md_get_size( md_ctx->md_info ); |
markrad | 0:cdf462088d13 | 477 | |
markrad | 0:cdf462088d13 | 478 | /* Generate and apply dbMask */ |
markrad | 0:cdf462088d13 | 479 | p = dst; |
markrad | 0:cdf462088d13 | 480 | |
markrad | 0:cdf462088d13 | 481 | while( dlen > 0 ) |
markrad | 0:cdf462088d13 | 482 | { |
markrad | 0:cdf462088d13 | 483 | use_len = hlen; |
markrad | 0:cdf462088d13 | 484 | if( dlen < hlen ) |
markrad | 0:cdf462088d13 | 485 | use_len = dlen; |
markrad | 0:cdf462088d13 | 486 | |
markrad | 0:cdf462088d13 | 487 | mbedtls_md_starts( md_ctx ); |
markrad | 0:cdf462088d13 | 488 | mbedtls_md_update( md_ctx, src, slen ); |
markrad | 0:cdf462088d13 | 489 | mbedtls_md_update( md_ctx, counter, 4 ); |
markrad | 0:cdf462088d13 | 490 | mbedtls_md_finish( md_ctx, mask ); |
markrad | 0:cdf462088d13 | 491 | |
markrad | 0:cdf462088d13 | 492 | for( i = 0; i < use_len; ++i ) |
markrad | 0:cdf462088d13 | 493 | *p++ ^= mask[i]; |
markrad | 0:cdf462088d13 | 494 | |
markrad | 0:cdf462088d13 | 495 | counter[3]++; |
markrad | 0:cdf462088d13 | 496 | |
markrad | 0:cdf462088d13 | 497 | dlen -= use_len; |
markrad | 0:cdf462088d13 | 498 | } |
markrad | 0:cdf462088d13 | 499 | } |
markrad | 0:cdf462088d13 | 500 | #endif /* MBEDTLS_PKCS1_V21 */ |
markrad | 0:cdf462088d13 | 501 | |
markrad | 0:cdf462088d13 | 502 | #if defined(MBEDTLS_PKCS1_V21) |
markrad | 0:cdf462088d13 | 503 | /* |
markrad | 0:cdf462088d13 | 504 | * Implementation of the PKCS#1 v2.1 RSAES-OAEP-ENCRYPT function |
markrad | 0:cdf462088d13 | 505 | */ |
markrad | 0:cdf462088d13 | 506 | int mbedtls_rsa_rsaes_oaep_encrypt( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 507 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 508 | void *p_rng, |
markrad | 0:cdf462088d13 | 509 | int mode, |
markrad | 0:cdf462088d13 | 510 | const unsigned char *label, size_t label_len, |
markrad | 0:cdf462088d13 | 511 | size_t ilen, |
markrad | 0:cdf462088d13 | 512 | const unsigned char *input, |
markrad | 0:cdf462088d13 | 513 | unsigned char *output ) |
markrad | 0:cdf462088d13 | 514 | { |
markrad | 0:cdf462088d13 | 515 | size_t olen; |
markrad | 0:cdf462088d13 | 516 | int ret; |
markrad | 0:cdf462088d13 | 517 | unsigned char *p = output; |
markrad | 0:cdf462088d13 | 518 | unsigned int hlen; |
markrad | 0:cdf462088d13 | 519 | const mbedtls_md_info_t *md_info; |
markrad | 0:cdf462088d13 | 520 | mbedtls_md_context_t md_ctx; |
markrad | 0:cdf462088d13 | 521 | |
markrad | 0:cdf462088d13 | 522 | if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 ) |
markrad | 0:cdf462088d13 | 523 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 524 | |
markrad | 0:cdf462088d13 | 525 | if( f_rng == NULL ) |
markrad | 0:cdf462088d13 | 526 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 527 | |
markrad | 0:cdf462088d13 | 528 | md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id ); |
markrad | 0:cdf462088d13 | 529 | if( md_info == NULL ) |
markrad | 0:cdf462088d13 | 530 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 531 | |
markrad | 0:cdf462088d13 | 532 | olen = ctx->len; |
markrad | 0:cdf462088d13 | 533 | hlen = mbedtls_md_get_size( md_info ); |
markrad | 0:cdf462088d13 | 534 | |
markrad | 0:cdf462088d13 | 535 | /* first comparison checks for overflow */ |
markrad | 0:cdf462088d13 | 536 | if( ilen + 2 * hlen + 2 < ilen || olen < ilen + 2 * hlen + 2 ) |
markrad | 0:cdf462088d13 | 537 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 538 | |
markrad | 0:cdf462088d13 | 539 | memset( output, 0, olen ); |
markrad | 0:cdf462088d13 | 540 | |
markrad | 0:cdf462088d13 | 541 | *p++ = 0; |
markrad | 0:cdf462088d13 | 542 | |
markrad | 0:cdf462088d13 | 543 | /* Generate a random octet string seed */ |
markrad | 0:cdf462088d13 | 544 | if( ( ret = f_rng( p_rng, p, hlen ) ) != 0 ) |
markrad | 0:cdf462088d13 | 545 | return( MBEDTLS_ERR_RSA_RNG_FAILED + ret ); |
markrad | 0:cdf462088d13 | 546 | |
markrad | 0:cdf462088d13 | 547 | p += hlen; |
markrad | 0:cdf462088d13 | 548 | |
markrad | 0:cdf462088d13 | 549 | /* Construct DB */ |
markrad | 0:cdf462088d13 | 550 | mbedtls_md( md_info, label, label_len, p ); |
markrad | 0:cdf462088d13 | 551 | p += hlen; |
markrad | 0:cdf462088d13 | 552 | p += olen - 2 * hlen - 2 - ilen; |
markrad | 0:cdf462088d13 | 553 | *p++ = 1; |
markrad | 0:cdf462088d13 | 554 | memcpy( p, input, ilen ); |
markrad | 0:cdf462088d13 | 555 | |
markrad | 0:cdf462088d13 | 556 | mbedtls_md_init( &md_ctx ); |
markrad | 0:cdf462088d13 | 557 | if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 ) |
markrad | 0:cdf462088d13 | 558 | { |
markrad | 0:cdf462088d13 | 559 | mbedtls_md_free( &md_ctx ); |
markrad | 0:cdf462088d13 | 560 | return( ret ); |
markrad | 0:cdf462088d13 | 561 | } |
markrad | 0:cdf462088d13 | 562 | |
markrad | 0:cdf462088d13 | 563 | /* maskedDB: Apply dbMask to DB */ |
markrad | 0:cdf462088d13 | 564 | mgf_mask( output + hlen + 1, olen - hlen - 1, output + 1, hlen, |
markrad | 0:cdf462088d13 | 565 | &md_ctx ); |
markrad | 0:cdf462088d13 | 566 | |
markrad | 0:cdf462088d13 | 567 | /* maskedSeed: Apply seedMask to seed */ |
markrad | 0:cdf462088d13 | 568 | mgf_mask( output + 1, hlen, output + hlen + 1, olen - hlen - 1, |
markrad | 0:cdf462088d13 | 569 | &md_ctx ); |
markrad | 0:cdf462088d13 | 570 | |
markrad | 0:cdf462088d13 | 571 | mbedtls_md_free( &md_ctx ); |
markrad | 0:cdf462088d13 | 572 | |
markrad | 0:cdf462088d13 | 573 | return( ( mode == MBEDTLS_RSA_PUBLIC ) |
markrad | 0:cdf462088d13 | 574 | ? mbedtls_rsa_public( ctx, output, output ) |
markrad | 0:cdf462088d13 | 575 | : mbedtls_rsa_private( ctx, f_rng, p_rng, output, output ) ); |
markrad | 0:cdf462088d13 | 576 | } |
markrad | 0:cdf462088d13 | 577 | #endif /* MBEDTLS_PKCS1_V21 */ |
markrad | 0:cdf462088d13 | 578 | |
markrad | 0:cdf462088d13 | 579 | #if defined(MBEDTLS_PKCS1_V15) |
markrad | 0:cdf462088d13 | 580 | /* |
markrad | 0:cdf462088d13 | 581 | * Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-ENCRYPT function |
markrad | 0:cdf462088d13 | 582 | */ |
markrad | 0:cdf462088d13 | 583 | int mbedtls_rsa_rsaes_pkcs1_v15_encrypt( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 584 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 585 | void *p_rng, |
markrad | 0:cdf462088d13 | 586 | int mode, size_t ilen, |
markrad | 0:cdf462088d13 | 587 | const unsigned char *input, |
markrad | 0:cdf462088d13 | 588 | unsigned char *output ) |
markrad | 0:cdf462088d13 | 589 | { |
markrad | 0:cdf462088d13 | 590 | size_t nb_pad, olen; |
markrad | 0:cdf462088d13 | 591 | int ret; |
markrad | 0:cdf462088d13 | 592 | unsigned char *p = output; |
markrad | 0:cdf462088d13 | 593 | |
markrad | 0:cdf462088d13 | 594 | if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 ) |
markrad | 0:cdf462088d13 | 595 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 596 | |
markrad | 0:cdf462088d13 | 597 | // We don't check p_rng because it won't be dereferenced here |
markrad | 0:cdf462088d13 | 598 | if( f_rng == NULL || input == NULL || output == NULL ) |
markrad | 0:cdf462088d13 | 599 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 600 | |
markrad | 0:cdf462088d13 | 601 | olen = ctx->len; |
markrad | 0:cdf462088d13 | 602 | |
markrad | 0:cdf462088d13 | 603 | /* first comparison checks for overflow */ |
markrad | 0:cdf462088d13 | 604 | if( ilen + 11 < ilen || olen < ilen + 11 ) |
markrad | 0:cdf462088d13 | 605 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 606 | |
markrad | 0:cdf462088d13 | 607 | nb_pad = olen - 3 - ilen; |
markrad | 0:cdf462088d13 | 608 | |
markrad | 0:cdf462088d13 | 609 | *p++ = 0; |
markrad | 0:cdf462088d13 | 610 | if( mode == MBEDTLS_RSA_PUBLIC ) |
markrad | 0:cdf462088d13 | 611 | { |
markrad | 0:cdf462088d13 | 612 | *p++ = MBEDTLS_RSA_CRYPT; |
markrad | 0:cdf462088d13 | 613 | |
markrad | 0:cdf462088d13 | 614 | while( nb_pad-- > 0 ) |
markrad | 0:cdf462088d13 | 615 | { |
markrad | 0:cdf462088d13 | 616 | int rng_dl = 100; |
markrad | 0:cdf462088d13 | 617 | |
markrad | 0:cdf462088d13 | 618 | do { |
markrad | 0:cdf462088d13 | 619 | ret = f_rng( p_rng, p, 1 ); |
markrad | 0:cdf462088d13 | 620 | } while( *p == 0 && --rng_dl && ret == 0 ); |
markrad | 0:cdf462088d13 | 621 | |
markrad | 0:cdf462088d13 | 622 | /* Check if RNG failed to generate data */ |
markrad | 0:cdf462088d13 | 623 | if( rng_dl == 0 || ret != 0 ) |
markrad | 0:cdf462088d13 | 624 | return( MBEDTLS_ERR_RSA_RNG_FAILED + ret ); |
markrad | 0:cdf462088d13 | 625 | |
markrad | 0:cdf462088d13 | 626 | p++; |
markrad | 0:cdf462088d13 | 627 | } |
markrad | 0:cdf462088d13 | 628 | } |
markrad | 0:cdf462088d13 | 629 | else |
markrad | 0:cdf462088d13 | 630 | { |
markrad | 0:cdf462088d13 | 631 | *p++ = MBEDTLS_RSA_SIGN; |
markrad | 0:cdf462088d13 | 632 | |
markrad | 0:cdf462088d13 | 633 | while( nb_pad-- > 0 ) |
markrad | 0:cdf462088d13 | 634 | *p++ = 0xFF; |
markrad | 0:cdf462088d13 | 635 | } |
markrad | 0:cdf462088d13 | 636 | |
markrad | 0:cdf462088d13 | 637 | *p++ = 0; |
markrad | 0:cdf462088d13 | 638 | memcpy( p, input, ilen ); |
markrad | 0:cdf462088d13 | 639 | |
markrad | 0:cdf462088d13 | 640 | return( ( mode == MBEDTLS_RSA_PUBLIC ) |
markrad | 0:cdf462088d13 | 641 | ? mbedtls_rsa_public( ctx, output, output ) |
markrad | 0:cdf462088d13 | 642 | : mbedtls_rsa_private( ctx, f_rng, p_rng, output, output ) ); |
markrad | 0:cdf462088d13 | 643 | } |
markrad | 0:cdf462088d13 | 644 | #endif /* MBEDTLS_PKCS1_V15 */ |
markrad | 0:cdf462088d13 | 645 | |
markrad | 0:cdf462088d13 | 646 | /* |
markrad | 0:cdf462088d13 | 647 | * Add the message padding, then do an RSA operation |
markrad | 0:cdf462088d13 | 648 | */ |
markrad | 0:cdf462088d13 | 649 | int mbedtls_rsa_pkcs1_encrypt( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 650 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 651 | void *p_rng, |
markrad | 0:cdf462088d13 | 652 | int mode, size_t ilen, |
markrad | 0:cdf462088d13 | 653 | const unsigned char *input, |
markrad | 0:cdf462088d13 | 654 | unsigned char *output ) |
markrad | 0:cdf462088d13 | 655 | { |
markrad | 0:cdf462088d13 | 656 | switch( ctx->padding ) |
markrad | 0:cdf462088d13 | 657 | { |
markrad | 0:cdf462088d13 | 658 | #if defined(MBEDTLS_PKCS1_V15) |
markrad | 0:cdf462088d13 | 659 | case MBEDTLS_RSA_PKCS_V15: |
markrad | 0:cdf462088d13 | 660 | return mbedtls_rsa_rsaes_pkcs1_v15_encrypt( ctx, f_rng, p_rng, mode, ilen, |
markrad | 0:cdf462088d13 | 661 | input, output ); |
markrad | 0:cdf462088d13 | 662 | #endif |
markrad | 0:cdf462088d13 | 663 | |
markrad | 0:cdf462088d13 | 664 | #if defined(MBEDTLS_PKCS1_V21) |
markrad | 0:cdf462088d13 | 665 | case MBEDTLS_RSA_PKCS_V21: |
markrad | 0:cdf462088d13 | 666 | return mbedtls_rsa_rsaes_oaep_encrypt( ctx, f_rng, p_rng, mode, NULL, 0, |
markrad | 0:cdf462088d13 | 667 | ilen, input, output ); |
markrad | 0:cdf462088d13 | 668 | #endif |
markrad | 0:cdf462088d13 | 669 | |
markrad | 0:cdf462088d13 | 670 | default: |
markrad | 0:cdf462088d13 | 671 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 672 | } |
markrad | 0:cdf462088d13 | 673 | } |
markrad | 0:cdf462088d13 | 674 | |
markrad | 0:cdf462088d13 | 675 | #if defined(MBEDTLS_PKCS1_V21) |
markrad | 0:cdf462088d13 | 676 | /* |
markrad | 0:cdf462088d13 | 677 | * Implementation of the PKCS#1 v2.1 RSAES-OAEP-DECRYPT function |
markrad | 0:cdf462088d13 | 678 | */ |
markrad | 0:cdf462088d13 | 679 | int mbedtls_rsa_rsaes_oaep_decrypt( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 680 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 681 | void *p_rng, |
markrad | 0:cdf462088d13 | 682 | int mode, |
markrad | 0:cdf462088d13 | 683 | const unsigned char *label, size_t label_len, |
markrad | 0:cdf462088d13 | 684 | size_t *olen, |
markrad | 0:cdf462088d13 | 685 | const unsigned char *input, |
markrad | 0:cdf462088d13 | 686 | unsigned char *output, |
markrad | 0:cdf462088d13 | 687 | size_t output_max_len ) |
markrad | 0:cdf462088d13 | 688 | { |
markrad | 0:cdf462088d13 | 689 | int ret; |
markrad | 0:cdf462088d13 | 690 | size_t ilen, i, pad_len; |
markrad | 0:cdf462088d13 | 691 | unsigned char *p, bad, pad_done; |
markrad | 0:cdf462088d13 | 692 | unsigned char buf[MBEDTLS_MPI_MAX_SIZE]; |
markrad | 0:cdf462088d13 | 693 | unsigned char lhash[MBEDTLS_MD_MAX_SIZE]; |
markrad | 0:cdf462088d13 | 694 | unsigned int hlen; |
markrad | 0:cdf462088d13 | 695 | const mbedtls_md_info_t *md_info; |
markrad | 0:cdf462088d13 | 696 | mbedtls_md_context_t md_ctx; |
markrad | 0:cdf462088d13 | 697 | |
markrad | 0:cdf462088d13 | 698 | /* |
markrad | 0:cdf462088d13 | 699 | * Parameters sanity checks |
markrad | 0:cdf462088d13 | 700 | */ |
markrad | 0:cdf462088d13 | 701 | if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 ) |
markrad | 0:cdf462088d13 | 702 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 703 | |
markrad | 0:cdf462088d13 | 704 | ilen = ctx->len; |
markrad | 0:cdf462088d13 | 705 | |
markrad | 0:cdf462088d13 | 706 | if( ilen < 16 || ilen > sizeof( buf ) ) |
markrad | 0:cdf462088d13 | 707 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 708 | |
markrad | 0:cdf462088d13 | 709 | md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id ); |
markrad | 0:cdf462088d13 | 710 | if( md_info == NULL ) |
markrad | 0:cdf462088d13 | 711 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 712 | |
markrad | 0:cdf462088d13 | 713 | hlen = mbedtls_md_get_size( md_info ); |
markrad | 0:cdf462088d13 | 714 | |
markrad | 0:cdf462088d13 | 715 | // checking for integer underflow |
markrad | 0:cdf462088d13 | 716 | if( 2 * hlen + 2 > ilen ) |
markrad | 0:cdf462088d13 | 717 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 718 | |
markrad | 0:cdf462088d13 | 719 | /* |
markrad | 0:cdf462088d13 | 720 | * RSA operation |
markrad | 0:cdf462088d13 | 721 | */ |
markrad | 0:cdf462088d13 | 722 | ret = ( mode == MBEDTLS_RSA_PUBLIC ) |
markrad | 0:cdf462088d13 | 723 | ? mbedtls_rsa_public( ctx, input, buf ) |
markrad | 0:cdf462088d13 | 724 | : mbedtls_rsa_private( ctx, f_rng, p_rng, input, buf ); |
markrad | 0:cdf462088d13 | 725 | |
markrad | 0:cdf462088d13 | 726 | if( ret != 0 ) |
markrad | 0:cdf462088d13 | 727 | return( ret ); |
markrad | 0:cdf462088d13 | 728 | |
markrad | 0:cdf462088d13 | 729 | /* |
markrad | 0:cdf462088d13 | 730 | * Unmask data and generate lHash |
markrad | 0:cdf462088d13 | 731 | */ |
markrad | 0:cdf462088d13 | 732 | mbedtls_md_init( &md_ctx ); |
markrad | 0:cdf462088d13 | 733 | if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 ) |
markrad | 0:cdf462088d13 | 734 | { |
markrad | 0:cdf462088d13 | 735 | mbedtls_md_free( &md_ctx ); |
markrad | 0:cdf462088d13 | 736 | return( ret ); |
markrad | 0:cdf462088d13 | 737 | } |
markrad | 0:cdf462088d13 | 738 | |
markrad | 0:cdf462088d13 | 739 | |
markrad | 0:cdf462088d13 | 740 | /* Generate lHash */ |
markrad | 0:cdf462088d13 | 741 | mbedtls_md( md_info, label, label_len, lhash ); |
markrad | 0:cdf462088d13 | 742 | |
markrad | 0:cdf462088d13 | 743 | /* seed: Apply seedMask to maskedSeed */ |
markrad | 0:cdf462088d13 | 744 | mgf_mask( buf + 1, hlen, buf + hlen + 1, ilen - hlen - 1, |
markrad | 0:cdf462088d13 | 745 | &md_ctx ); |
markrad | 0:cdf462088d13 | 746 | |
markrad | 0:cdf462088d13 | 747 | /* DB: Apply dbMask to maskedDB */ |
markrad | 0:cdf462088d13 | 748 | mgf_mask( buf + hlen + 1, ilen - hlen - 1, buf + 1, hlen, |
markrad | 0:cdf462088d13 | 749 | &md_ctx ); |
markrad | 0:cdf462088d13 | 750 | |
markrad | 0:cdf462088d13 | 751 | mbedtls_md_free( &md_ctx ); |
markrad | 0:cdf462088d13 | 752 | |
markrad | 0:cdf462088d13 | 753 | /* |
markrad | 0:cdf462088d13 | 754 | * Check contents, in "constant-time" |
markrad | 0:cdf462088d13 | 755 | */ |
markrad | 0:cdf462088d13 | 756 | p = buf; |
markrad | 0:cdf462088d13 | 757 | bad = 0; |
markrad | 0:cdf462088d13 | 758 | |
markrad | 0:cdf462088d13 | 759 | bad |= *p++; /* First byte must be 0 */ |
markrad | 0:cdf462088d13 | 760 | |
markrad | 0:cdf462088d13 | 761 | p += hlen; /* Skip seed */ |
markrad | 0:cdf462088d13 | 762 | |
markrad | 0:cdf462088d13 | 763 | /* Check lHash */ |
markrad | 0:cdf462088d13 | 764 | for( i = 0; i < hlen; i++ ) |
markrad | 0:cdf462088d13 | 765 | bad |= lhash[i] ^ *p++; |
markrad | 0:cdf462088d13 | 766 | |
markrad | 0:cdf462088d13 | 767 | /* Get zero-padding len, but always read till end of buffer |
markrad | 0:cdf462088d13 | 768 | * (minus one, for the 01 byte) */ |
markrad | 0:cdf462088d13 | 769 | pad_len = 0; |
markrad | 0:cdf462088d13 | 770 | pad_done = 0; |
markrad | 0:cdf462088d13 | 771 | for( i = 0; i < ilen - 2 * hlen - 2; i++ ) |
markrad | 0:cdf462088d13 | 772 | { |
markrad | 0:cdf462088d13 | 773 | pad_done |= p[i]; |
markrad | 0:cdf462088d13 | 774 | pad_len += ((pad_done | (unsigned char)-pad_done) >> 7) ^ 1; |
markrad | 0:cdf462088d13 | 775 | } |
markrad | 0:cdf462088d13 | 776 | |
markrad | 0:cdf462088d13 | 777 | p += pad_len; |
markrad | 0:cdf462088d13 | 778 | bad |= *p++ ^ 0x01; |
markrad | 0:cdf462088d13 | 779 | |
markrad | 0:cdf462088d13 | 780 | /* |
markrad | 0:cdf462088d13 | 781 | * The only information "leaked" is whether the padding was correct or not |
markrad | 0:cdf462088d13 | 782 | * (eg, no data is copied if it was not correct). This meets the |
markrad | 0:cdf462088d13 | 783 | * recommendations in PKCS#1 v2.2: an opponent cannot distinguish between |
markrad | 0:cdf462088d13 | 784 | * the different error conditions. |
markrad | 0:cdf462088d13 | 785 | */ |
markrad | 0:cdf462088d13 | 786 | if( bad != 0 ) |
markrad | 0:cdf462088d13 | 787 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 788 | |
markrad | 0:cdf462088d13 | 789 | if( ilen - ( p - buf ) > output_max_len ) |
markrad | 0:cdf462088d13 | 790 | return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE ); |
markrad | 0:cdf462088d13 | 791 | |
markrad | 0:cdf462088d13 | 792 | *olen = ilen - (p - buf); |
markrad | 0:cdf462088d13 | 793 | memcpy( output, p, *olen ); |
markrad | 0:cdf462088d13 | 794 | |
markrad | 0:cdf462088d13 | 795 | return( 0 ); |
markrad | 0:cdf462088d13 | 796 | } |
markrad | 0:cdf462088d13 | 797 | #endif /* MBEDTLS_PKCS1_V21 */ |
markrad | 0:cdf462088d13 | 798 | |
markrad | 0:cdf462088d13 | 799 | #if defined(MBEDTLS_PKCS1_V15) |
markrad | 0:cdf462088d13 | 800 | /* |
markrad | 0:cdf462088d13 | 801 | * Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-DECRYPT function |
markrad | 0:cdf462088d13 | 802 | */ |
markrad | 0:cdf462088d13 | 803 | int mbedtls_rsa_rsaes_pkcs1_v15_decrypt( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 804 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 805 | void *p_rng, |
markrad | 0:cdf462088d13 | 806 | int mode, size_t *olen, |
markrad | 0:cdf462088d13 | 807 | const unsigned char *input, |
markrad | 0:cdf462088d13 | 808 | unsigned char *output, |
markrad | 0:cdf462088d13 | 809 | size_t output_max_len) |
markrad | 0:cdf462088d13 | 810 | { |
markrad | 0:cdf462088d13 | 811 | int ret; |
markrad | 0:cdf462088d13 | 812 | size_t ilen, pad_count = 0, i; |
markrad | 0:cdf462088d13 | 813 | unsigned char *p, bad, pad_done = 0; |
markrad | 0:cdf462088d13 | 814 | unsigned char buf[MBEDTLS_MPI_MAX_SIZE]; |
markrad | 0:cdf462088d13 | 815 | |
markrad | 0:cdf462088d13 | 816 | if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 ) |
markrad | 0:cdf462088d13 | 817 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 818 | |
markrad | 0:cdf462088d13 | 819 | ilen = ctx->len; |
markrad | 0:cdf462088d13 | 820 | |
markrad | 0:cdf462088d13 | 821 | if( ilen < 16 || ilen > sizeof( buf ) ) |
markrad | 0:cdf462088d13 | 822 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 823 | |
markrad | 0:cdf462088d13 | 824 | ret = ( mode == MBEDTLS_RSA_PUBLIC ) |
markrad | 0:cdf462088d13 | 825 | ? mbedtls_rsa_public( ctx, input, buf ) |
markrad | 0:cdf462088d13 | 826 | : mbedtls_rsa_private( ctx, f_rng, p_rng, input, buf ); |
markrad | 0:cdf462088d13 | 827 | |
markrad | 0:cdf462088d13 | 828 | if( ret != 0 ) |
markrad | 0:cdf462088d13 | 829 | return( ret ); |
markrad | 0:cdf462088d13 | 830 | |
markrad | 0:cdf462088d13 | 831 | p = buf; |
markrad | 0:cdf462088d13 | 832 | bad = 0; |
markrad | 0:cdf462088d13 | 833 | |
markrad | 0:cdf462088d13 | 834 | /* |
markrad | 0:cdf462088d13 | 835 | * Check and get padding len in "constant-time" |
markrad | 0:cdf462088d13 | 836 | */ |
markrad | 0:cdf462088d13 | 837 | bad |= *p++; /* First byte must be 0 */ |
markrad | 0:cdf462088d13 | 838 | |
markrad | 0:cdf462088d13 | 839 | /* This test does not depend on secret data */ |
markrad | 0:cdf462088d13 | 840 | if( mode == MBEDTLS_RSA_PRIVATE ) |
markrad | 0:cdf462088d13 | 841 | { |
markrad | 0:cdf462088d13 | 842 | bad |= *p++ ^ MBEDTLS_RSA_CRYPT; |
markrad | 0:cdf462088d13 | 843 | |
markrad | 0:cdf462088d13 | 844 | /* Get padding len, but always read till end of buffer |
markrad | 0:cdf462088d13 | 845 | * (minus one, for the 00 byte) */ |
markrad | 0:cdf462088d13 | 846 | for( i = 0; i < ilen - 3; i++ ) |
markrad | 0:cdf462088d13 | 847 | { |
markrad | 0:cdf462088d13 | 848 | pad_done |= ((p[i] | (unsigned char)-p[i]) >> 7) ^ 1; |
markrad | 0:cdf462088d13 | 849 | pad_count += ((pad_done | (unsigned char)-pad_done) >> 7) ^ 1; |
markrad | 0:cdf462088d13 | 850 | } |
markrad | 0:cdf462088d13 | 851 | |
markrad | 0:cdf462088d13 | 852 | p += pad_count; |
markrad | 0:cdf462088d13 | 853 | bad |= *p++; /* Must be zero */ |
markrad | 0:cdf462088d13 | 854 | } |
markrad | 0:cdf462088d13 | 855 | else |
markrad | 0:cdf462088d13 | 856 | { |
markrad | 0:cdf462088d13 | 857 | bad |= *p++ ^ MBEDTLS_RSA_SIGN; |
markrad | 0:cdf462088d13 | 858 | |
markrad | 0:cdf462088d13 | 859 | /* Get padding len, but always read till end of buffer |
markrad | 0:cdf462088d13 | 860 | * (minus one, for the 00 byte) */ |
markrad | 0:cdf462088d13 | 861 | for( i = 0; i < ilen - 3; i++ ) |
markrad | 0:cdf462088d13 | 862 | { |
markrad | 0:cdf462088d13 | 863 | pad_done |= ( p[i] != 0xFF ); |
markrad | 0:cdf462088d13 | 864 | pad_count += ( pad_done == 0 ); |
markrad | 0:cdf462088d13 | 865 | } |
markrad | 0:cdf462088d13 | 866 | |
markrad | 0:cdf462088d13 | 867 | p += pad_count; |
markrad | 0:cdf462088d13 | 868 | bad |= *p++; /* Must be zero */ |
markrad | 0:cdf462088d13 | 869 | } |
markrad | 0:cdf462088d13 | 870 | |
markrad | 0:cdf462088d13 | 871 | bad |= ( pad_count < 8 ); |
markrad | 0:cdf462088d13 | 872 | |
markrad | 0:cdf462088d13 | 873 | if( bad ) |
markrad | 0:cdf462088d13 | 874 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 875 | |
markrad | 0:cdf462088d13 | 876 | if( ilen - ( p - buf ) > output_max_len ) |
markrad | 0:cdf462088d13 | 877 | return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE ); |
markrad | 0:cdf462088d13 | 878 | |
markrad | 0:cdf462088d13 | 879 | *olen = ilen - (p - buf); |
markrad | 0:cdf462088d13 | 880 | memcpy( output, p, *olen ); |
markrad | 0:cdf462088d13 | 881 | |
markrad | 0:cdf462088d13 | 882 | return( 0 ); |
markrad | 0:cdf462088d13 | 883 | } |
markrad | 0:cdf462088d13 | 884 | #endif /* MBEDTLS_PKCS1_V15 */ |
markrad | 0:cdf462088d13 | 885 | |
markrad | 0:cdf462088d13 | 886 | /* |
markrad | 0:cdf462088d13 | 887 | * Do an RSA operation, then remove the message padding |
markrad | 0:cdf462088d13 | 888 | */ |
markrad | 0:cdf462088d13 | 889 | int mbedtls_rsa_pkcs1_decrypt( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 890 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 891 | void *p_rng, |
markrad | 0:cdf462088d13 | 892 | int mode, size_t *olen, |
markrad | 0:cdf462088d13 | 893 | const unsigned char *input, |
markrad | 0:cdf462088d13 | 894 | unsigned char *output, |
markrad | 0:cdf462088d13 | 895 | size_t output_max_len) |
markrad | 0:cdf462088d13 | 896 | { |
markrad | 0:cdf462088d13 | 897 | switch( ctx->padding ) |
markrad | 0:cdf462088d13 | 898 | { |
markrad | 0:cdf462088d13 | 899 | #if defined(MBEDTLS_PKCS1_V15) |
markrad | 0:cdf462088d13 | 900 | case MBEDTLS_RSA_PKCS_V15: |
markrad | 0:cdf462088d13 | 901 | return mbedtls_rsa_rsaes_pkcs1_v15_decrypt( ctx, f_rng, p_rng, mode, olen, |
markrad | 0:cdf462088d13 | 902 | input, output, output_max_len ); |
markrad | 0:cdf462088d13 | 903 | #endif |
markrad | 0:cdf462088d13 | 904 | |
markrad | 0:cdf462088d13 | 905 | #if defined(MBEDTLS_PKCS1_V21) |
markrad | 0:cdf462088d13 | 906 | case MBEDTLS_RSA_PKCS_V21: |
markrad | 0:cdf462088d13 | 907 | return mbedtls_rsa_rsaes_oaep_decrypt( ctx, f_rng, p_rng, mode, NULL, 0, |
markrad | 0:cdf462088d13 | 908 | olen, input, output, |
markrad | 0:cdf462088d13 | 909 | output_max_len ); |
markrad | 0:cdf462088d13 | 910 | #endif |
markrad | 0:cdf462088d13 | 911 | |
markrad | 0:cdf462088d13 | 912 | default: |
markrad | 0:cdf462088d13 | 913 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 914 | } |
markrad | 0:cdf462088d13 | 915 | } |
markrad | 0:cdf462088d13 | 916 | |
markrad | 0:cdf462088d13 | 917 | #if defined(MBEDTLS_PKCS1_V21) |
markrad | 0:cdf462088d13 | 918 | /* |
markrad | 0:cdf462088d13 | 919 | * Implementation of the PKCS#1 v2.1 RSASSA-PSS-SIGN function |
markrad | 0:cdf462088d13 | 920 | */ |
markrad | 0:cdf462088d13 | 921 | int mbedtls_rsa_rsassa_pss_sign( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 922 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 923 | void *p_rng, |
markrad | 0:cdf462088d13 | 924 | int mode, |
markrad | 0:cdf462088d13 | 925 | mbedtls_md_type_t md_alg, |
markrad | 0:cdf462088d13 | 926 | unsigned int hashlen, |
markrad | 0:cdf462088d13 | 927 | const unsigned char *hash, |
markrad | 0:cdf462088d13 | 928 | unsigned char *sig ) |
markrad | 0:cdf462088d13 | 929 | { |
markrad | 0:cdf462088d13 | 930 | size_t olen; |
markrad | 0:cdf462088d13 | 931 | unsigned char *p = sig; |
markrad | 0:cdf462088d13 | 932 | unsigned char salt[MBEDTLS_MD_MAX_SIZE]; |
markrad | 0:cdf462088d13 | 933 | unsigned int slen, hlen, offset = 0; |
markrad | 0:cdf462088d13 | 934 | int ret; |
markrad | 0:cdf462088d13 | 935 | size_t msb; |
markrad | 0:cdf462088d13 | 936 | const mbedtls_md_info_t *md_info; |
markrad | 0:cdf462088d13 | 937 | mbedtls_md_context_t md_ctx; |
markrad | 0:cdf462088d13 | 938 | |
markrad | 0:cdf462088d13 | 939 | if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 ) |
markrad | 0:cdf462088d13 | 940 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 941 | |
markrad | 0:cdf462088d13 | 942 | if( f_rng == NULL ) |
markrad | 0:cdf462088d13 | 943 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 944 | |
markrad | 0:cdf462088d13 | 945 | olen = ctx->len; |
markrad | 0:cdf462088d13 | 946 | |
markrad | 0:cdf462088d13 | 947 | if( md_alg != MBEDTLS_MD_NONE ) |
markrad | 0:cdf462088d13 | 948 | { |
markrad | 0:cdf462088d13 | 949 | /* Gather length of hash to sign */ |
markrad | 0:cdf462088d13 | 950 | md_info = mbedtls_md_info_from_type( md_alg ); |
markrad | 0:cdf462088d13 | 951 | if( md_info == NULL ) |
markrad | 0:cdf462088d13 | 952 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 953 | |
markrad | 0:cdf462088d13 | 954 | hashlen = mbedtls_md_get_size( md_info ); |
markrad | 0:cdf462088d13 | 955 | } |
markrad | 0:cdf462088d13 | 956 | |
markrad | 0:cdf462088d13 | 957 | md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id ); |
markrad | 0:cdf462088d13 | 958 | if( md_info == NULL ) |
markrad | 0:cdf462088d13 | 959 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 960 | |
markrad | 0:cdf462088d13 | 961 | hlen = mbedtls_md_get_size( md_info ); |
markrad | 0:cdf462088d13 | 962 | slen = hlen; |
markrad | 0:cdf462088d13 | 963 | |
markrad | 0:cdf462088d13 | 964 | if( olen < hlen + slen + 2 ) |
markrad | 0:cdf462088d13 | 965 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 966 | |
markrad | 0:cdf462088d13 | 967 | memset( sig, 0, olen ); |
markrad | 0:cdf462088d13 | 968 | |
markrad | 0:cdf462088d13 | 969 | /* Generate salt of length slen */ |
markrad | 0:cdf462088d13 | 970 | if( ( ret = f_rng( p_rng, salt, slen ) ) != 0 ) |
markrad | 0:cdf462088d13 | 971 | return( MBEDTLS_ERR_RSA_RNG_FAILED + ret ); |
markrad | 0:cdf462088d13 | 972 | |
markrad | 0:cdf462088d13 | 973 | /* Note: EMSA-PSS encoding is over the length of N - 1 bits */ |
markrad | 0:cdf462088d13 | 974 | msb = mbedtls_mpi_bitlen( &ctx->N ) - 1; |
markrad | 0:cdf462088d13 | 975 | p += olen - hlen * 2 - 2; |
markrad | 0:cdf462088d13 | 976 | *p++ = 0x01; |
markrad | 0:cdf462088d13 | 977 | memcpy( p, salt, slen ); |
markrad | 0:cdf462088d13 | 978 | p += slen; |
markrad | 0:cdf462088d13 | 979 | |
markrad | 0:cdf462088d13 | 980 | mbedtls_md_init( &md_ctx ); |
markrad | 0:cdf462088d13 | 981 | if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 ) |
markrad | 0:cdf462088d13 | 982 | { |
markrad | 0:cdf462088d13 | 983 | mbedtls_md_free( &md_ctx ); |
markrad | 0:cdf462088d13 | 984 | return( ret ); |
markrad | 0:cdf462088d13 | 985 | } |
markrad | 0:cdf462088d13 | 986 | |
markrad | 0:cdf462088d13 | 987 | /* Generate H = Hash( M' ) */ |
markrad | 0:cdf462088d13 | 988 | mbedtls_md_starts( &md_ctx ); |
markrad | 0:cdf462088d13 | 989 | mbedtls_md_update( &md_ctx, p, 8 ); |
markrad | 0:cdf462088d13 | 990 | mbedtls_md_update( &md_ctx, hash, hashlen ); |
markrad | 0:cdf462088d13 | 991 | mbedtls_md_update( &md_ctx, salt, slen ); |
markrad | 0:cdf462088d13 | 992 | mbedtls_md_finish( &md_ctx, p ); |
markrad | 0:cdf462088d13 | 993 | |
markrad | 0:cdf462088d13 | 994 | /* Compensate for boundary condition when applying mask */ |
markrad | 0:cdf462088d13 | 995 | if( msb % 8 == 0 ) |
markrad | 0:cdf462088d13 | 996 | offset = 1; |
markrad | 0:cdf462088d13 | 997 | |
markrad | 0:cdf462088d13 | 998 | /* maskedDB: Apply dbMask to DB */ |
markrad | 0:cdf462088d13 | 999 | mgf_mask( sig + offset, olen - hlen - 1 - offset, p, hlen, &md_ctx ); |
markrad | 0:cdf462088d13 | 1000 | |
markrad | 0:cdf462088d13 | 1001 | mbedtls_md_free( &md_ctx ); |
markrad | 0:cdf462088d13 | 1002 | |
markrad | 0:cdf462088d13 | 1003 | msb = mbedtls_mpi_bitlen( &ctx->N ) - 1; |
markrad | 0:cdf462088d13 | 1004 | sig[0] &= 0xFF >> ( olen * 8 - msb ); |
markrad | 0:cdf462088d13 | 1005 | |
markrad | 0:cdf462088d13 | 1006 | p += hlen; |
markrad | 0:cdf462088d13 | 1007 | *p++ = 0xBC; |
markrad | 0:cdf462088d13 | 1008 | |
markrad | 0:cdf462088d13 | 1009 | return( ( mode == MBEDTLS_RSA_PUBLIC ) |
markrad | 0:cdf462088d13 | 1010 | ? mbedtls_rsa_public( ctx, sig, sig ) |
markrad | 0:cdf462088d13 | 1011 | : mbedtls_rsa_private( ctx, f_rng, p_rng, sig, sig ) ); |
markrad | 0:cdf462088d13 | 1012 | } |
markrad | 0:cdf462088d13 | 1013 | #endif /* MBEDTLS_PKCS1_V21 */ |
markrad | 0:cdf462088d13 | 1014 | |
markrad | 0:cdf462088d13 | 1015 | #if defined(MBEDTLS_PKCS1_V15) |
markrad | 0:cdf462088d13 | 1016 | /* |
markrad | 0:cdf462088d13 | 1017 | * Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-V1_5-SIGN function |
markrad | 0:cdf462088d13 | 1018 | */ |
markrad | 0:cdf462088d13 | 1019 | /* |
markrad | 0:cdf462088d13 | 1020 | * Do an RSA operation to sign the message digest |
markrad | 0:cdf462088d13 | 1021 | */ |
markrad | 0:cdf462088d13 | 1022 | int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 1023 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 1024 | void *p_rng, |
markrad | 0:cdf462088d13 | 1025 | int mode, |
markrad | 0:cdf462088d13 | 1026 | mbedtls_md_type_t md_alg, |
markrad | 0:cdf462088d13 | 1027 | unsigned int hashlen, |
markrad | 0:cdf462088d13 | 1028 | const unsigned char *hash, |
markrad | 0:cdf462088d13 | 1029 | unsigned char *sig ) |
markrad | 0:cdf462088d13 | 1030 | { |
markrad | 0:cdf462088d13 | 1031 | size_t nb_pad, olen, oid_size = 0; |
markrad | 0:cdf462088d13 | 1032 | unsigned char *p = sig; |
markrad | 0:cdf462088d13 | 1033 | const char *oid = NULL; |
markrad | 0:cdf462088d13 | 1034 | unsigned char *sig_try = NULL, *verif = NULL; |
markrad | 0:cdf462088d13 | 1035 | size_t i; |
markrad | 0:cdf462088d13 | 1036 | unsigned char diff; |
markrad | 0:cdf462088d13 | 1037 | volatile unsigned char diff_no_optimize; |
markrad | 0:cdf462088d13 | 1038 | int ret; |
markrad | 0:cdf462088d13 | 1039 | |
markrad | 0:cdf462088d13 | 1040 | if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 ) |
markrad | 0:cdf462088d13 | 1041 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1042 | |
markrad | 0:cdf462088d13 | 1043 | olen = ctx->len; |
markrad | 0:cdf462088d13 | 1044 | nb_pad = olen - 3; |
markrad | 0:cdf462088d13 | 1045 | |
markrad | 0:cdf462088d13 | 1046 | if( md_alg != MBEDTLS_MD_NONE ) |
markrad | 0:cdf462088d13 | 1047 | { |
markrad | 0:cdf462088d13 | 1048 | const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg ); |
markrad | 0:cdf462088d13 | 1049 | if( md_info == NULL ) |
markrad | 0:cdf462088d13 | 1050 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1051 | |
markrad | 0:cdf462088d13 | 1052 | if( mbedtls_oid_get_oid_by_md( md_alg, &oid, &oid_size ) != 0 ) |
markrad | 0:cdf462088d13 | 1053 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1054 | |
markrad | 0:cdf462088d13 | 1055 | nb_pad -= 10 + oid_size; |
markrad | 0:cdf462088d13 | 1056 | |
markrad | 0:cdf462088d13 | 1057 | hashlen = mbedtls_md_get_size( md_info ); |
markrad | 0:cdf462088d13 | 1058 | } |
markrad | 0:cdf462088d13 | 1059 | |
markrad | 0:cdf462088d13 | 1060 | nb_pad -= hashlen; |
markrad | 0:cdf462088d13 | 1061 | |
markrad | 0:cdf462088d13 | 1062 | if( ( nb_pad < 8 ) || ( nb_pad > olen ) ) |
markrad | 0:cdf462088d13 | 1063 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1064 | |
markrad | 0:cdf462088d13 | 1065 | *p++ = 0; |
markrad | 0:cdf462088d13 | 1066 | *p++ = MBEDTLS_RSA_SIGN; |
markrad | 0:cdf462088d13 | 1067 | memset( p, 0xFF, nb_pad ); |
markrad | 0:cdf462088d13 | 1068 | p += nb_pad; |
markrad | 0:cdf462088d13 | 1069 | *p++ = 0; |
markrad | 0:cdf462088d13 | 1070 | |
markrad | 0:cdf462088d13 | 1071 | if( md_alg == MBEDTLS_MD_NONE ) |
markrad | 0:cdf462088d13 | 1072 | { |
markrad | 0:cdf462088d13 | 1073 | memcpy( p, hash, hashlen ); |
markrad | 0:cdf462088d13 | 1074 | } |
markrad | 0:cdf462088d13 | 1075 | else |
markrad | 0:cdf462088d13 | 1076 | { |
markrad | 0:cdf462088d13 | 1077 | /* |
markrad | 0:cdf462088d13 | 1078 | * DigestInfo ::= SEQUENCE { |
markrad | 0:cdf462088d13 | 1079 | * digestAlgorithm DigestAlgorithmIdentifier, |
markrad | 0:cdf462088d13 | 1080 | * digest Digest } |
markrad | 0:cdf462088d13 | 1081 | * |
markrad | 0:cdf462088d13 | 1082 | * DigestAlgorithmIdentifier ::= AlgorithmIdentifier |
markrad | 0:cdf462088d13 | 1083 | * |
markrad | 0:cdf462088d13 | 1084 | * Digest ::= OCTET STRING |
markrad | 0:cdf462088d13 | 1085 | */ |
markrad | 0:cdf462088d13 | 1086 | *p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED; |
markrad | 0:cdf462088d13 | 1087 | *p++ = (unsigned char) ( 0x08 + oid_size + hashlen ); |
markrad | 0:cdf462088d13 | 1088 | *p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED; |
markrad | 0:cdf462088d13 | 1089 | *p++ = (unsigned char) ( 0x04 + oid_size ); |
markrad | 0:cdf462088d13 | 1090 | *p++ = MBEDTLS_ASN1_OID; |
markrad | 0:cdf462088d13 | 1091 | *p++ = oid_size & 0xFF; |
markrad | 0:cdf462088d13 | 1092 | memcpy( p, oid, oid_size ); |
markrad | 0:cdf462088d13 | 1093 | p += oid_size; |
markrad | 0:cdf462088d13 | 1094 | *p++ = MBEDTLS_ASN1_NULL; |
markrad | 0:cdf462088d13 | 1095 | *p++ = 0x00; |
markrad | 0:cdf462088d13 | 1096 | *p++ = MBEDTLS_ASN1_OCTET_STRING; |
markrad | 0:cdf462088d13 | 1097 | *p++ = hashlen; |
markrad | 0:cdf462088d13 | 1098 | memcpy( p, hash, hashlen ); |
markrad | 0:cdf462088d13 | 1099 | } |
markrad | 0:cdf462088d13 | 1100 | |
markrad | 0:cdf462088d13 | 1101 | if( mode == MBEDTLS_RSA_PUBLIC ) |
markrad | 0:cdf462088d13 | 1102 | return( mbedtls_rsa_public( ctx, sig, sig ) ); |
markrad | 0:cdf462088d13 | 1103 | |
markrad | 0:cdf462088d13 | 1104 | /* |
markrad | 0:cdf462088d13 | 1105 | * In order to prevent Lenstra's attack, make the signature in a |
markrad | 0:cdf462088d13 | 1106 | * temporary buffer and check it before returning it. |
markrad | 0:cdf462088d13 | 1107 | */ |
markrad | 0:cdf462088d13 | 1108 | sig_try = mbedtls_calloc( 1, ctx->len ); |
markrad | 0:cdf462088d13 | 1109 | if( sig_try == NULL ) |
markrad | 0:cdf462088d13 | 1110 | return( MBEDTLS_ERR_MPI_ALLOC_FAILED ); |
markrad | 0:cdf462088d13 | 1111 | |
markrad | 0:cdf462088d13 | 1112 | verif = mbedtls_calloc( 1, ctx->len ); |
markrad | 0:cdf462088d13 | 1113 | if( verif == NULL ) |
markrad | 0:cdf462088d13 | 1114 | { |
markrad | 0:cdf462088d13 | 1115 | mbedtls_free( sig_try ); |
markrad | 0:cdf462088d13 | 1116 | return( MBEDTLS_ERR_MPI_ALLOC_FAILED ); |
markrad | 0:cdf462088d13 | 1117 | } |
markrad | 0:cdf462088d13 | 1118 | |
markrad | 0:cdf462088d13 | 1119 | MBEDTLS_MPI_CHK( mbedtls_rsa_private( ctx, f_rng, p_rng, sig, sig_try ) ); |
markrad | 0:cdf462088d13 | 1120 | MBEDTLS_MPI_CHK( mbedtls_rsa_public( ctx, sig_try, verif ) ); |
markrad | 0:cdf462088d13 | 1121 | |
markrad | 0:cdf462088d13 | 1122 | /* Compare in constant time just in case */ |
markrad | 0:cdf462088d13 | 1123 | for( diff = 0, i = 0; i < ctx->len; i++ ) |
markrad | 0:cdf462088d13 | 1124 | diff |= verif[i] ^ sig[i]; |
markrad | 0:cdf462088d13 | 1125 | diff_no_optimize = diff; |
markrad | 0:cdf462088d13 | 1126 | |
markrad | 0:cdf462088d13 | 1127 | if( diff_no_optimize != 0 ) |
markrad | 0:cdf462088d13 | 1128 | { |
markrad | 0:cdf462088d13 | 1129 | ret = MBEDTLS_ERR_RSA_PRIVATE_FAILED; |
markrad | 0:cdf462088d13 | 1130 | goto cleanup; |
markrad | 0:cdf462088d13 | 1131 | } |
markrad | 0:cdf462088d13 | 1132 | |
markrad | 0:cdf462088d13 | 1133 | memcpy( sig, sig_try, ctx->len ); |
markrad | 0:cdf462088d13 | 1134 | |
markrad | 0:cdf462088d13 | 1135 | cleanup: |
markrad | 0:cdf462088d13 | 1136 | mbedtls_free( sig_try ); |
markrad | 0:cdf462088d13 | 1137 | mbedtls_free( verif ); |
markrad | 0:cdf462088d13 | 1138 | |
markrad | 0:cdf462088d13 | 1139 | return( ret ); |
markrad | 0:cdf462088d13 | 1140 | } |
markrad | 0:cdf462088d13 | 1141 | #endif /* MBEDTLS_PKCS1_V15 */ |
markrad | 0:cdf462088d13 | 1142 | |
markrad | 0:cdf462088d13 | 1143 | /* |
markrad | 0:cdf462088d13 | 1144 | * Do an RSA operation to sign the message digest |
markrad | 0:cdf462088d13 | 1145 | */ |
markrad | 0:cdf462088d13 | 1146 | int mbedtls_rsa_pkcs1_sign( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 1147 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 1148 | void *p_rng, |
markrad | 0:cdf462088d13 | 1149 | int mode, |
markrad | 0:cdf462088d13 | 1150 | mbedtls_md_type_t md_alg, |
markrad | 0:cdf462088d13 | 1151 | unsigned int hashlen, |
markrad | 0:cdf462088d13 | 1152 | const unsigned char *hash, |
markrad | 0:cdf462088d13 | 1153 | unsigned char *sig ) |
markrad | 0:cdf462088d13 | 1154 | { |
markrad | 0:cdf462088d13 | 1155 | switch( ctx->padding ) |
markrad | 0:cdf462088d13 | 1156 | { |
markrad | 0:cdf462088d13 | 1157 | #if defined(MBEDTLS_PKCS1_V15) |
markrad | 0:cdf462088d13 | 1158 | case MBEDTLS_RSA_PKCS_V15: |
markrad | 0:cdf462088d13 | 1159 | return mbedtls_rsa_rsassa_pkcs1_v15_sign( ctx, f_rng, p_rng, mode, md_alg, |
markrad | 0:cdf462088d13 | 1160 | hashlen, hash, sig ); |
markrad | 0:cdf462088d13 | 1161 | #endif |
markrad | 0:cdf462088d13 | 1162 | |
markrad | 0:cdf462088d13 | 1163 | #if defined(MBEDTLS_PKCS1_V21) |
markrad | 0:cdf462088d13 | 1164 | case MBEDTLS_RSA_PKCS_V21: |
markrad | 0:cdf462088d13 | 1165 | return mbedtls_rsa_rsassa_pss_sign( ctx, f_rng, p_rng, mode, md_alg, |
markrad | 0:cdf462088d13 | 1166 | hashlen, hash, sig ); |
markrad | 0:cdf462088d13 | 1167 | #endif |
markrad | 0:cdf462088d13 | 1168 | |
markrad | 0:cdf462088d13 | 1169 | default: |
markrad | 0:cdf462088d13 | 1170 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 1171 | } |
markrad | 0:cdf462088d13 | 1172 | } |
markrad | 0:cdf462088d13 | 1173 | |
markrad | 0:cdf462088d13 | 1174 | #if defined(MBEDTLS_PKCS1_V21) |
markrad | 0:cdf462088d13 | 1175 | /* |
markrad | 0:cdf462088d13 | 1176 | * Implementation of the PKCS#1 v2.1 RSASSA-PSS-VERIFY function |
markrad | 0:cdf462088d13 | 1177 | */ |
markrad | 0:cdf462088d13 | 1178 | int mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 1179 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 1180 | void *p_rng, |
markrad | 0:cdf462088d13 | 1181 | int mode, |
markrad | 0:cdf462088d13 | 1182 | mbedtls_md_type_t md_alg, |
markrad | 0:cdf462088d13 | 1183 | unsigned int hashlen, |
markrad | 0:cdf462088d13 | 1184 | const unsigned char *hash, |
markrad | 0:cdf462088d13 | 1185 | mbedtls_md_type_t mgf1_hash_id, |
markrad | 0:cdf462088d13 | 1186 | int expected_salt_len, |
markrad | 0:cdf462088d13 | 1187 | const unsigned char *sig ) |
markrad | 0:cdf462088d13 | 1188 | { |
markrad | 0:cdf462088d13 | 1189 | int ret; |
markrad | 0:cdf462088d13 | 1190 | size_t siglen; |
markrad | 0:cdf462088d13 | 1191 | unsigned char *p; |
markrad | 0:cdf462088d13 | 1192 | unsigned char result[MBEDTLS_MD_MAX_SIZE]; |
markrad | 0:cdf462088d13 | 1193 | unsigned char zeros[8]; |
markrad | 0:cdf462088d13 | 1194 | unsigned int hlen; |
markrad | 0:cdf462088d13 | 1195 | size_t slen, msb; |
markrad | 0:cdf462088d13 | 1196 | const mbedtls_md_info_t *md_info; |
markrad | 0:cdf462088d13 | 1197 | mbedtls_md_context_t md_ctx; |
markrad | 0:cdf462088d13 | 1198 | unsigned char buf[MBEDTLS_MPI_MAX_SIZE]; |
markrad | 0:cdf462088d13 | 1199 | |
markrad | 0:cdf462088d13 | 1200 | if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 ) |
markrad | 0:cdf462088d13 | 1201 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1202 | |
markrad | 0:cdf462088d13 | 1203 | siglen = ctx->len; |
markrad | 0:cdf462088d13 | 1204 | |
markrad | 0:cdf462088d13 | 1205 | if( siglen < 16 || siglen > sizeof( buf ) ) |
markrad | 0:cdf462088d13 | 1206 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1207 | |
markrad | 0:cdf462088d13 | 1208 | ret = ( mode == MBEDTLS_RSA_PUBLIC ) |
markrad | 0:cdf462088d13 | 1209 | ? mbedtls_rsa_public( ctx, sig, buf ) |
markrad | 0:cdf462088d13 | 1210 | : mbedtls_rsa_private( ctx, f_rng, p_rng, sig, buf ); |
markrad | 0:cdf462088d13 | 1211 | |
markrad | 0:cdf462088d13 | 1212 | if( ret != 0 ) |
markrad | 0:cdf462088d13 | 1213 | return( ret ); |
markrad | 0:cdf462088d13 | 1214 | |
markrad | 0:cdf462088d13 | 1215 | p = buf; |
markrad | 0:cdf462088d13 | 1216 | |
markrad | 0:cdf462088d13 | 1217 | if( buf[siglen - 1] != 0xBC ) |
markrad | 0:cdf462088d13 | 1218 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 1219 | |
markrad | 0:cdf462088d13 | 1220 | if( md_alg != MBEDTLS_MD_NONE ) |
markrad | 0:cdf462088d13 | 1221 | { |
markrad | 0:cdf462088d13 | 1222 | /* Gather length of hash to sign */ |
markrad | 0:cdf462088d13 | 1223 | md_info = mbedtls_md_info_from_type( md_alg ); |
markrad | 0:cdf462088d13 | 1224 | if( md_info == NULL ) |
markrad | 0:cdf462088d13 | 1225 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1226 | |
markrad | 0:cdf462088d13 | 1227 | hashlen = mbedtls_md_get_size( md_info ); |
markrad | 0:cdf462088d13 | 1228 | } |
markrad | 0:cdf462088d13 | 1229 | |
markrad | 0:cdf462088d13 | 1230 | md_info = mbedtls_md_info_from_type( mgf1_hash_id ); |
markrad | 0:cdf462088d13 | 1231 | if( md_info == NULL ) |
markrad | 0:cdf462088d13 | 1232 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1233 | |
markrad | 0:cdf462088d13 | 1234 | hlen = mbedtls_md_get_size( md_info ); |
markrad | 0:cdf462088d13 | 1235 | slen = siglen - hlen - 1; /* Currently length of salt + padding */ |
markrad | 0:cdf462088d13 | 1236 | |
markrad | 0:cdf462088d13 | 1237 | memset( zeros, 0, 8 ); |
markrad | 0:cdf462088d13 | 1238 | |
markrad | 0:cdf462088d13 | 1239 | /* |
markrad | 0:cdf462088d13 | 1240 | * Note: EMSA-PSS verification is over the length of N - 1 bits |
markrad | 0:cdf462088d13 | 1241 | */ |
markrad | 0:cdf462088d13 | 1242 | msb = mbedtls_mpi_bitlen( &ctx->N ) - 1; |
markrad | 0:cdf462088d13 | 1243 | |
markrad | 0:cdf462088d13 | 1244 | /* Compensate for boundary condition when applying mask */ |
markrad | 0:cdf462088d13 | 1245 | if( msb % 8 == 0 ) |
markrad | 0:cdf462088d13 | 1246 | { |
markrad | 0:cdf462088d13 | 1247 | p++; |
markrad | 0:cdf462088d13 | 1248 | siglen -= 1; |
markrad | 0:cdf462088d13 | 1249 | } |
markrad | 0:cdf462088d13 | 1250 | if( buf[0] >> ( 8 - siglen * 8 + msb ) ) |
markrad | 0:cdf462088d13 | 1251 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1252 | |
markrad | 0:cdf462088d13 | 1253 | mbedtls_md_init( &md_ctx ); |
markrad | 0:cdf462088d13 | 1254 | if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 ) |
markrad | 0:cdf462088d13 | 1255 | { |
markrad | 0:cdf462088d13 | 1256 | mbedtls_md_free( &md_ctx ); |
markrad | 0:cdf462088d13 | 1257 | return( ret ); |
markrad | 0:cdf462088d13 | 1258 | } |
markrad | 0:cdf462088d13 | 1259 | |
markrad | 0:cdf462088d13 | 1260 | mgf_mask( p, siglen - hlen - 1, p + siglen - hlen - 1, hlen, &md_ctx ); |
markrad | 0:cdf462088d13 | 1261 | |
markrad | 0:cdf462088d13 | 1262 | buf[0] &= 0xFF >> ( siglen * 8 - msb ); |
markrad | 0:cdf462088d13 | 1263 | |
markrad | 0:cdf462088d13 | 1264 | while( p < buf + siglen && *p == 0 ) |
markrad | 0:cdf462088d13 | 1265 | p++; |
markrad | 0:cdf462088d13 | 1266 | |
markrad | 0:cdf462088d13 | 1267 | if( p == buf + siglen || |
markrad | 0:cdf462088d13 | 1268 | *p++ != 0x01 ) |
markrad | 0:cdf462088d13 | 1269 | { |
markrad | 0:cdf462088d13 | 1270 | mbedtls_md_free( &md_ctx ); |
markrad | 0:cdf462088d13 | 1271 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 1272 | } |
markrad | 0:cdf462088d13 | 1273 | |
markrad | 0:cdf462088d13 | 1274 | /* Actual salt len */ |
markrad | 0:cdf462088d13 | 1275 | slen -= p - buf; |
markrad | 0:cdf462088d13 | 1276 | |
markrad | 0:cdf462088d13 | 1277 | if( expected_salt_len != MBEDTLS_RSA_SALT_LEN_ANY && |
markrad | 0:cdf462088d13 | 1278 | slen != (size_t) expected_salt_len ) |
markrad | 0:cdf462088d13 | 1279 | { |
markrad | 0:cdf462088d13 | 1280 | mbedtls_md_free( &md_ctx ); |
markrad | 0:cdf462088d13 | 1281 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 1282 | } |
markrad | 0:cdf462088d13 | 1283 | |
markrad | 0:cdf462088d13 | 1284 | /* |
markrad | 0:cdf462088d13 | 1285 | * Generate H = Hash( M' ) |
markrad | 0:cdf462088d13 | 1286 | */ |
markrad | 0:cdf462088d13 | 1287 | mbedtls_md_starts( &md_ctx ); |
markrad | 0:cdf462088d13 | 1288 | mbedtls_md_update( &md_ctx, zeros, 8 ); |
markrad | 0:cdf462088d13 | 1289 | mbedtls_md_update( &md_ctx, hash, hashlen ); |
markrad | 0:cdf462088d13 | 1290 | mbedtls_md_update( &md_ctx, p, slen ); |
markrad | 0:cdf462088d13 | 1291 | mbedtls_md_finish( &md_ctx, result ); |
markrad | 0:cdf462088d13 | 1292 | |
markrad | 0:cdf462088d13 | 1293 | mbedtls_md_free( &md_ctx ); |
markrad | 0:cdf462088d13 | 1294 | |
markrad | 0:cdf462088d13 | 1295 | if( memcmp( p + slen, result, hlen ) == 0 ) |
markrad | 0:cdf462088d13 | 1296 | return( 0 ); |
markrad | 0:cdf462088d13 | 1297 | else |
markrad | 0:cdf462088d13 | 1298 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1299 | } |
markrad | 0:cdf462088d13 | 1300 | |
markrad | 0:cdf462088d13 | 1301 | /* |
markrad | 0:cdf462088d13 | 1302 | * Simplified PKCS#1 v2.1 RSASSA-PSS-VERIFY function |
markrad | 0:cdf462088d13 | 1303 | */ |
markrad | 0:cdf462088d13 | 1304 | int mbedtls_rsa_rsassa_pss_verify( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 1305 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 1306 | void *p_rng, |
markrad | 0:cdf462088d13 | 1307 | int mode, |
markrad | 0:cdf462088d13 | 1308 | mbedtls_md_type_t md_alg, |
markrad | 0:cdf462088d13 | 1309 | unsigned int hashlen, |
markrad | 0:cdf462088d13 | 1310 | const unsigned char *hash, |
markrad | 0:cdf462088d13 | 1311 | const unsigned char *sig ) |
markrad | 0:cdf462088d13 | 1312 | { |
markrad | 0:cdf462088d13 | 1313 | mbedtls_md_type_t mgf1_hash_id = ( ctx->hash_id != MBEDTLS_MD_NONE ) |
markrad | 0:cdf462088d13 | 1314 | ? (mbedtls_md_type_t) ctx->hash_id |
markrad | 0:cdf462088d13 | 1315 | : md_alg; |
markrad | 0:cdf462088d13 | 1316 | |
markrad | 0:cdf462088d13 | 1317 | return( mbedtls_rsa_rsassa_pss_verify_ext( ctx, f_rng, p_rng, mode, |
markrad | 0:cdf462088d13 | 1318 | md_alg, hashlen, hash, |
markrad | 0:cdf462088d13 | 1319 | mgf1_hash_id, MBEDTLS_RSA_SALT_LEN_ANY, |
markrad | 0:cdf462088d13 | 1320 | sig ) ); |
markrad | 0:cdf462088d13 | 1321 | |
markrad | 0:cdf462088d13 | 1322 | } |
markrad | 0:cdf462088d13 | 1323 | #endif /* MBEDTLS_PKCS1_V21 */ |
markrad | 0:cdf462088d13 | 1324 | |
markrad | 0:cdf462088d13 | 1325 | #if defined(MBEDTLS_PKCS1_V15) |
markrad | 0:cdf462088d13 | 1326 | /* |
markrad | 0:cdf462088d13 | 1327 | * Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-v1_5-VERIFY function |
markrad | 0:cdf462088d13 | 1328 | */ |
markrad | 0:cdf462088d13 | 1329 | int mbedtls_rsa_rsassa_pkcs1_v15_verify( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 1330 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 1331 | void *p_rng, |
markrad | 0:cdf462088d13 | 1332 | int mode, |
markrad | 0:cdf462088d13 | 1333 | mbedtls_md_type_t md_alg, |
markrad | 0:cdf462088d13 | 1334 | unsigned int hashlen, |
markrad | 0:cdf462088d13 | 1335 | const unsigned char *hash, |
markrad | 0:cdf462088d13 | 1336 | const unsigned char *sig ) |
markrad | 0:cdf462088d13 | 1337 | { |
markrad | 0:cdf462088d13 | 1338 | int ret; |
markrad | 0:cdf462088d13 | 1339 | size_t len, siglen, asn1_len; |
markrad | 0:cdf462088d13 | 1340 | unsigned char *p, *end; |
markrad | 0:cdf462088d13 | 1341 | mbedtls_md_type_t msg_md_alg; |
markrad | 0:cdf462088d13 | 1342 | const mbedtls_md_info_t *md_info; |
markrad | 0:cdf462088d13 | 1343 | mbedtls_asn1_buf oid; |
markrad | 0:cdf462088d13 | 1344 | unsigned char buf[MBEDTLS_MPI_MAX_SIZE]; |
markrad | 0:cdf462088d13 | 1345 | |
markrad | 0:cdf462088d13 | 1346 | if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 ) |
markrad | 0:cdf462088d13 | 1347 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1348 | |
markrad | 0:cdf462088d13 | 1349 | siglen = ctx->len; |
markrad | 0:cdf462088d13 | 1350 | |
markrad | 0:cdf462088d13 | 1351 | if( siglen < 16 || siglen > sizeof( buf ) ) |
markrad | 0:cdf462088d13 | 1352 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1353 | |
markrad | 0:cdf462088d13 | 1354 | ret = ( mode == MBEDTLS_RSA_PUBLIC ) |
markrad | 0:cdf462088d13 | 1355 | ? mbedtls_rsa_public( ctx, sig, buf ) |
markrad | 0:cdf462088d13 | 1356 | : mbedtls_rsa_private( ctx, f_rng, p_rng, sig, buf ); |
markrad | 0:cdf462088d13 | 1357 | |
markrad | 0:cdf462088d13 | 1358 | if( ret != 0 ) |
markrad | 0:cdf462088d13 | 1359 | return( ret ); |
markrad | 0:cdf462088d13 | 1360 | |
markrad | 0:cdf462088d13 | 1361 | p = buf; |
markrad | 0:cdf462088d13 | 1362 | |
markrad | 0:cdf462088d13 | 1363 | if( *p++ != 0 || *p++ != MBEDTLS_RSA_SIGN ) |
markrad | 0:cdf462088d13 | 1364 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 1365 | |
markrad | 0:cdf462088d13 | 1366 | while( *p != 0 ) |
markrad | 0:cdf462088d13 | 1367 | { |
markrad | 0:cdf462088d13 | 1368 | if( p >= buf + siglen - 1 || *p != 0xFF ) |
markrad | 0:cdf462088d13 | 1369 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 1370 | p++; |
markrad | 0:cdf462088d13 | 1371 | } |
markrad | 0:cdf462088d13 | 1372 | p++; |
markrad | 0:cdf462088d13 | 1373 | |
markrad | 0:cdf462088d13 | 1374 | len = siglen - ( p - buf ); |
markrad | 0:cdf462088d13 | 1375 | |
markrad | 0:cdf462088d13 | 1376 | if( len == hashlen && md_alg == MBEDTLS_MD_NONE ) |
markrad | 0:cdf462088d13 | 1377 | { |
markrad | 0:cdf462088d13 | 1378 | if( memcmp( p, hash, hashlen ) == 0 ) |
markrad | 0:cdf462088d13 | 1379 | return( 0 ); |
markrad | 0:cdf462088d13 | 1380 | else |
markrad | 0:cdf462088d13 | 1381 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1382 | } |
markrad | 0:cdf462088d13 | 1383 | |
markrad | 0:cdf462088d13 | 1384 | md_info = mbedtls_md_info_from_type( md_alg ); |
markrad | 0:cdf462088d13 | 1385 | if( md_info == NULL ) |
markrad | 0:cdf462088d13 | 1386 | return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA ); |
markrad | 0:cdf462088d13 | 1387 | hashlen = mbedtls_md_get_size( md_info ); |
markrad | 0:cdf462088d13 | 1388 | |
markrad | 0:cdf462088d13 | 1389 | end = p + len; |
markrad | 0:cdf462088d13 | 1390 | |
markrad | 0:cdf462088d13 | 1391 | /* |
markrad | 0:cdf462088d13 | 1392 | * Parse the ASN.1 structure inside the PKCS#1 v1.5 structure |
markrad | 0:cdf462088d13 | 1393 | */ |
markrad | 0:cdf462088d13 | 1394 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len, |
markrad | 0:cdf462088d13 | 1395 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
markrad | 0:cdf462088d13 | 1396 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1397 | |
markrad | 0:cdf462088d13 | 1398 | if( asn1_len + 2 != len ) |
markrad | 0:cdf462088d13 | 1399 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1400 | |
markrad | 0:cdf462088d13 | 1401 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len, |
markrad | 0:cdf462088d13 | 1402 | MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) |
markrad | 0:cdf462088d13 | 1403 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1404 | |
markrad | 0:cdf462088d13 | 1405 | if( asn1_len + 6 + hashlen != len ) |
markrad | 0:cdf462088d13 | 1406 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1407 | |
markrad | 0:cdf462088d13 | 1408 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &oid.len, MBEDTLS_ASN1_OID ) ) != 0 ) |
markrad | 0:cdf462088d13 | 1409 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1410 | |
markrad | 0:cdf462088d13 | 1411 | oid.p = p; |
markrad | 0:cdf462088d13 | 1412 | p += oid.len; |
markrad | 0:cdf462088d13 | 1413 | |
markrad | 0:cdf462088d13 | 1414 | if( mbedtls_oid_get_md_alg( &oid, &msg_md_alg ) != 0 ) |
markrad | 0:cdf462088d13 | 1415 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1416 | |
markrad | 0:cdf462088d13 | 1417 | if( md_alg != msg_md_alg ) |
markrad | 0:cdf462088d13 | 1418 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1419 | |
markrad | 0:cdf462088d13 | 1420 | /* |
markrad | 0:cdf462088d13 | 1421 | * assume the algorithm parameters must be NULL |
markrad | 0:cdf462088d13 | 1422 | */ |
markrad | 0:cdf462088d13 | 1423 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len, MBEDTLS_ASN1_NULL ) ) != 0 ) |
markrad | 0:cdf462088d13 | 1424 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1425 | |
markrad | 0:cdf462088d13 | 1426 | if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ) |
markrad | 0:cdf462088d13 | 1427 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1428 | |
markrad | 0:cdf462088d13 | 1429 | if( asn1_len != hashlen ) |
markrad | 0:cdf462088d13 | 1430 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1431 | |
markrad | 0:cdf462088d13 | 1432 | if( memcmp( p, hash, hashlen ) != 0 ) |
markrad | 0:cdf462088d13 | 1433 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1434 | |
markrad | 0:cdf462088d13 | 1435 | p += hashlen; |
markrad | 0:cdf462088d13 | 1436 | |
markrad | 0:cdf462088d13 | 1437 | if( p != end ) |
markrad | 0:cdf462088d13 | 1438 | return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); |
markrad | 0:cdf462088d13 | 1439 | |
markrad | 0:cdf462088d13 | 1440 | return( 0 ); |
markrad | 0:cdf462088d13 | 1441 | } |
markrad | 0:cdf462088d13 | 1442 | #endif /* MBEDTLS_PKCS1_V15 */ |
markrad | 0:cdf462088d13 | 1443 | |
markrad | 0:cdf462088d13 | 1444 | /* |
markrad | 0:cdf462088d13 | 1445 | * Do an RSA operation and check the message digest |
markrad | 0:cdf462088d13 | 1446 | */ |
markrad | 0:cdf462088d13 | 1447 | int mbedtls_rsa_pkcs1_verify( mbedtls_rsa_context *ctx, |
markrad | 0:cdf462088d13 | 1448 | int (*f_rng)(void *, unsigned char *, size_t), |
markrad | 0:cdf462088d13 | 1449 | void *p_rng, |
markrad | 0:cdf462088d13 | 1450 | int mode, |
markrad | 0:cdf462088d13 | 1451 | mbedtls_md_type_t md_alg, |
markrad | 0:cdf462088d13 | 1452 | unsigned int hashlen, |
markrad | 0:cdf462088d13 | 1453 | const unsigned char *hash, |
markrad | 0:cdf462088d13 | 1454 | const unsigned char *sig ) |
markrad | 0:cdf462088d13 | 1455 | { |
markrad | 0:cdf462088d13 | 1456 | switch( ctx->padding ) |
markrad | 0:cdf462088d13 | 1457 | { |
markrad | 0:cdf462088d13 | 1458 | #if defined(MBEDTLS_PKCS1_V15) |
markrad | 0:cdf462088d13 | 1459 | case MBEDTLS_RSA_PKCS_V15: |
markrad | 0:cdf462088d13 | 1460 | return mbedtls_rsa_rsassa_pkcs1_v15_verify( ctx, f_rng, p_rng, mode, md_alg, |
markrad | 0:cdf462088d13 | 1461 | hashlen, hash, sig ); |
markrad | 0:cdf462088d13 | 1462 | #endif |
markrad | 0:cdf462088d13 | 1463 | |
markrad | 0:cdf462088d13 | 1464 | #if defined(MBEDTLS_PKCS1_V21) |
markrad | 0:cdf462088d13 | 1465 | case MBEDTLS_RSA_PKCS_V21: |
markrad | 0:cdf462088d13 | 1466 | return mbedtls_rsa_rsassa_pss_verify( ctx, f_rng, p_rng, mode, md_alg, |
markrad | 0:cdf462088d13 | 1467 | hashlen, hash, sig ); |
markrad | 0:cdf462088d13 | 1468 | #endif |
markrad | 0:cdf462088d13 | 1469 | |
markrad | 0:cdf462088d13 | 1470 | default: |
markrad | 0:cdf462088d13 | 1471 | return( MBEDTLS_ERR_RSA_INVALID_PADDING ); |
markrad | 0:cdf462088d13 | 1472 | } |
markrad | 0:cdf462088d13 | 1473 | } |
markrad | 0:cdf462088d13 | 1474 | |
markrad | 0:cdf462088d13 | 1475 | /* |
markrad | 0:cdf462088d13 | 1476 | * Copy the components of an RSA key |
markrad | 0:cdf462088d13 | 1477 | */ |
markrad | 0:cdf462088d13 | 1478 | int mbedtls_rsa_copy( mbedtls_rsa_context *dst, const mbedtls_rsa_context *src ) |
markrad | 0:cdf462088d13 | 1479 | { |
markrad | 0:cdf462088d13 | 1480 | int ret; |
markrad | 0:cdf462088d13 | 1481 | |
markrad | 0:cdf462088d13 | 1482 | dst->ver = src->ver; |
markrad | 0:cdf462088d13 | 1483 | dst->len = src->len; |
markrad | 0:cdf462088d13 | 1484 | |
markrad | 0:cdf462088d13 | 1485 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->N, &src->N ) ); |
markrad | 0:cdf462088d13 | 1486 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->E, &src->E ) ); |
markrad | 0:cdf462088d13 | 1487 | |
markrad | 0:cdf462088d13 | 1488 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->D, &src->D ) ); |
markrad | 0:cdf462088d13 | 1489 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->P, &src->P ) ); |
markrad | 0:cdf462088d13 | 1490 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->Q, &src->Q ) ); |
markrad | 0:cdf462088d13 | 1491 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->DP, &src->DP ) ); |
markrad | 0:cdf462088d13 | 1492 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->DQ, &src->DQ ) ); |
markrad | 0:cdf462088d13 | 1493 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->QP, &src->QP ) ); |
markrad | 0:cdf462088d13 | 1494 | |
markrad | 0:cdf462088d13 | 1495 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->RN, &src->RN ) ); |
markrad | 0:cdf462088d13 | 1496 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->RP, &src->RP ) ); |
markrad | 0:cdf462088d13 | 1497 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->RQ, &src->RQ ) ); |
markrad | 0:cdf462088d13 | 1498 | |
markrad | 0:cdf462088d13 | 1499 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->Vi, &src->Vi ) ); |
markrad | 0:cdf462088d13 | 1500 | MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->Vf, &src->Vf ) ); |
markrad | 0:cdf462088d13 | 1501 | |
markrad | 0:cdf462088d13 | 1502 | dst->padding = src->padding; |
markrad | 0:cdf462088d13 | 1503 | dst->hash_id = src->hash_id; |
markrad | 0:cdf462088d13 | 1504 | |
markrad | 0:cdf462088d13 | 1505 | cleanup: |
markrad | 0:cdf462088d13 | 1506 | if( ret != 0 ) |
markrad | 0:cdf462088d13 | 1507 | mbedtls_rsa_free( dst ); |
markrad | 0:cdf462088d13 | 1508 | |
markrad | 0:cdf462088d13 | 1509 | return( ret ); |
markrad | 0:cdf462088d13 | 1510 | } |
markrad | 0:cdf462088d13 | 1511 | |
markrad | 0:cdf462088d13 | 1512 | /* |
markrad | 0:cdf462088d13 | 1513 | * Free the components of an RSA key |
markrad | 0:cdf462088d13 | 1514 | */ |
markrad | 0:cdf462088d13 | 1515 | void mbedtls_rsa_free( mbedtls_rsa_context *ctx ) |
markrad | 0:cdf462088d13 | 1516 | { |
markrad | 0:cdf462088d13 | 1517 | mbedtls_mpi_free( &ctx->Vi ); mbedtls_mpi_free( &ctx->Vf ); |
markrad | 0:cdf462088d13 | 1518 | mbedtls_mpi_free( &ctx->RQ ); mbedtls_mpi_free( &ctx->RP ); mbedtls_mpi_free( &ctx->RN ); |
markrad | 0:cdf462088d13 | 1519 | mbedtls_mpi_free( &ctx->QP ); mbedtls_mpi_free( &ctx->DQ ); mbedtls_mpi_free( &ctx->DP ); |
markrad | 0:cdf462088d13 | 1520 | mbedtls_mpi_free( &ctx->Q ); mbedtls_mpi_free( &ctx->P ); mbedtls_mpi_free( &ctx->D ); |
markrad | 0:cdf462088d13 | 1521 | mbedtls_mpi_free( &ctx->E ); mbedtls_mpi_free( &ctx->N ); |
markrad | 0:cdf462088d13 | 1522 | |
markrad | 0:cdf462088d13 | 1523 | #if defined(MBEDTLS_THREADING_C) |
markrad | 0:cdf462088d13 | 1524 | mbedtls_mutex_free( &ctx->mutex ); |
markrad | 0:cdf462088d13 | 1525 | #endif |
markrad | 0:cdf462088d13 | 1526 | } |
markrad | 0:cdf462088d13 | 1527 | |
markrad | 0:cdf462088d13 | 1528 | #if defined(MBEDTLS_SELF_TEST) |
markrad | 0:cdf462088d13 | 1529 | |
markrad | 0:cdf462088d13 | 1530 | #include "mbedtls/sha1.h" |
markrad | 0:cdf462088d13 | 1531 | |
markrad | 0:cdf462088d13 | 1532 | /* |
markrad | 0:cdf462088d13 | 1533 | * Example RSA-1024 keypair, for test purposes |
markrad | 0:cdf462088d13 | 1534 | */ |
markrad | 0:cdf462088d13 | 1535 | #define KEY_LEN 128 |
markrad | 0:cdf462088d13 | 1536 | |
markrad | 0:cdf462088d13 | 1537 | #define RSA_N "9292758453063D803DD603D5E777D788" \ |
markrad | 0:cdf462088d13 | 1538 | "8ED1D5BF35786190FA2F23EBC0848AEA" \ |
markrad | 0:cdf462088d13 | 1539 | "DDA92CA6C3D80B32C4D109BE0F36D6AE" \ |
markrad | 0:cdf462088d13 | 1540 | "7130B9CED7ACDF54CFC7555AC14EEBAB" \ |
markrad | 0:cdf462088d13 | 1541 | "93A89813FBF3C4F8066D2D800F7C38A8" \ |
markrad | 0:cdf462088d13 | 1542 | "1AE31942917403FF4946B0A83D3D3E05" \ |
markrad | 0:cdf462088d13 | 1543 | "EE57C6F5F5606FB5D4BC6CD34EE0801A" \ |
markrad | 0:cdf462088d13 | 1544 | "5E94BB77B07507233A0BC7BAC8F90F79" |
markrad | 0:cdf462088d13 | 1545 | |
markrad | 0:cdf462088d13 | 1546 | #define RSA_E "10001" |
markrad | 0:cdf462088d13 | 1547 | |
markrad | 0:cdf462088d13 | 1548 | #define RSA_D "24BF6185468786FDD303083D25E64EFC" \ |
markrad | 0:cdf462088d13 | 1549 | "66CA472BC44D253102F8B4A9D3BFA750" \ |
markrad | 0:cdf462088d13 | 1550 | "91386C0077937FE33FA3252D28855837" \ |
markrad | 0:cdf462088d13 | 1551 | "AE1B484A8A9A45F7EE8C0C634F99E8CD" \ |
markrad | 0:cdf462088d13 | 1552 | "DF79C5CE07EE72C7F123142198164234" \ |
markrad | 0:cdf462088d13 | 1553 | "CABB724CF78B8173B9F880FC86322407" \ |
markrad | 0:cdf462088d13 | 1554 | "AF1FEDFDDE2BEB674CA15F3E81A1521E" \ |
markrad | 0:cdf462088d13 | 1555 | "071513A1E85B5DFA031F21ECAE91A34D" |
markrad | 0:cdf462088d13 | 1556 | |
markrad | 0:cdf462088d13 | 1557 | #define RSA_P "C36D0EB7FCD285223CFB5AABA5BDA3D8" \ |
markrad | 0:cdf462088d13 | 1558 | "2C01CAD19EA484A87EA4377637E75500" \ |
markrad | 0:cdf462088d13 | 1559 | "FCB2005C5C7DD6EC4AC023CDA285D796" \ |
markrad | 0:cdf462088d13 | 1560 | "C3D9E75E1EFC42488BB4F1D13AC30A57" |
markrad | 0:cdf462088d13 | 1561 | |
markrad | 0:cdf462088d13 | 1562 | #define RSA_Q "C000DF51A7C77AE8D7C7370C1FF55B69" \ |
markrad | 0:cdf462088d13 | 1563 | "E211C2B9E5DB1ED0BF61D0D9899620F4" \ |
markrad | 0:cdf462088d13 | 1564 | "910E4168387E3C30AA1E00C339A79508" \ |
markrad | 0:cdf462088d13 | 1565 | "8452DD96A9A5EA5D9DCA68DA636032AF" |
markrad | 0:cdf462088d13 | 1566 | |
markrad | 0:cdf462088d13 | 1567 | #define RSA_DP "C1ACF567564274FB07A0BBAD5D26E298" \ |
markrad | 0:cdf462088d13 | 1568 | "3C94D22288ACD763FD8E5600ED4A702D" \ |
markrad | 0:cdf462088d13 | 1569 | "F84198A5F06C2E72236AE490C93F07F8" \ |
markrad | 0:cdf462088d13 | 1570 | "3CC559CD27BC2D1CA488811730BB5725" |
markrad | 0:cdf462088d13 | 1571 | |
markrad | 0:cdf462088d13 | 1572 | #define RSA_DQ "4959CBF6F8FEF750AEE6977C155579C7" \ |
markrad | 0:cdf462088d13 | 1573 | "D8AAEA56749EA28623272E4F7D0592AF" \ |
markrad | 0:cdf462088d13 | 1574 | "7C1F1313CAC9471B5C523BFE592F517B" \ |
markrad | 0:cdf462088d13 | 1575 | "407A1BD76C164B93DA2D32A383E58357" |
markrad | 0:cdf462088d13 | 1576 | |
markrad | 0:cdf462088d13 | 1577 | #define RSA_QP "9AE7FBC99546432DF71896FC239EADAE" \ |
markrad | 0:cdf462088d13 | 1578 | "F38D18D2B2F0E2DD275AA977E2BF4411" \ |
markrad | 0:cdf462088d13 | 1579 | "F5A3B2A5D33605AEBBCCBA7FEB9F2D2F" \ |
markrad | 0:cdf462088d13 | 1580 | "A74206CEC169D74BF5A8C50D6F48EA08" |
markrad | 0:cdf462088d13 | 1581 | |
markrad | 0:cdf462088d13 | 1582 | #define PT_LEN 24 |
markrad | 0:cdf462088d13 | 1583 | #define RSA_PT "\xAA\xBB\xCC\x03\x02\x01\x00\xFF\xFF\xFF\xFF\xFF" \ |
markrad | 0:cdf462088d13 | 1584 | "\x11\x22\x33\x0A\x0B\x0C\xCC\xDD\xDD\xDD\xDD\xDD" |
markrad | 0:cdf462088d13 | 1585 | |
markrad | 0:cdf462088d13 | 1586 | #if defined(MBEDTLS_PKCS1_V15) |
markrad | 0:cdf462088d13 | 1587 | static int myrand( void *rng_state, unsigned char *output, size_t len ) |
markrad | 0:cdf462088d13 | 1588 | { |
markrad | 0:cdf462088d13 | 1589 | #if !defined(__OpenBSD__) |
markrad | 0:cdf462088d13 | 1590 | size_t i; |
markrad | 0:cdf462088d13 | 1591 | |
markrad | 0:cdf462088d13 | 1592 | if( rng_state != NULL ) |
markrad | 0:cdf462088d13 | 1593 | rng_state = NULL; |
markrad | 0:cdf462088d13 | 1594 | |
markrad | 0:cdf462088d13 | 1595 | for( i = 0; i < len; ++i ) |
markrad | 0:cdf462088d13 | 1596 | output[i] = rand(); |
markrad | 0:cdf462088d13 | 1597 | #else |
markrad | 0:cdf462088d13 | 1598 | if( rng_state != NULL ) |
markrad | 0:cdf462088d13 | 1599 | rng_state = NULL; |
markrad | 0:cdf462088d13 | 1600 | |
markrad | 0:cdf462088d13 | 1601 | arc4random_buf( output, len ); |
markrad | 0:cdf462088d13 | 1602 | #endif /* !OpenBSD */ |
markrad | 0:cdf462088d13 | 1603 | |
markrad | 0:cdf462088d13 | 1604 | return( 0 ); |
markrad | 0:cdf462088d13 | 1605 | } |
markrad | 0:cdf462088d13 | 1606 | #endif /* MBEDTLS_PKCS1_V15 */ |
markrad | 0:cdf462088d13 | 1607 | |
markrad | 0:cdf462088d13 | 1608 | /* |
markrad | 0:cdf462088d13 | 1609 | * Checkup routine |
markrad | 0:cdf462088d13 | 1610 | */ |
markrad | 0:cdf462088d13 | 1611 | int mbedtls_rsa_self_test( int verbose ) |
markrad | 0:cdf462088d13 | 1612 | { |
markrad | 0:cdf462088d13 | 1613 | int ret = 0; |
markrad | 0:cdf462088d13 | 1614 | #if defined(MBEDTLS_PKCS1_V15) |
markrad | 0:cdf462088d13 | 1615 | size_t len; |
markrad | 0:cdf462088d13 | 1616 | mbedtls_rsa_context rsa; |
markrad | 0:cdf462088d13 | 1617 | unsigned char rsa_plaintext[PT_LEN]; |
markrad | 0:cdf462088d13 | 1618 | unsigned char rsa_decrypted[PT_LEN]; |
markrad | 0:cdf462088d13 | 1619 | unsigned char rsa_ciphertext[KEY_LEN]; |
markrad | 0:cdf462088d13 | 1620 | #if defined(MBEDTLS_SHA1_C) |
markrad | 0:cdf462088d13 | 1621 | unsigned char sha1sum[20]; |
markrad | 0:cdf462088d13 | 1622 | #endif |
markrad | 0:cdf462088d13 | 1623 | |
markrad | 0:cdf462088d13 | 1624 | mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 ); |
markrad | 0:cdf462088d13 | 1625 | |
markrad | 0:cdf462088d13 | 1626 | rsa.len = KEY_LEN; |
markrad | 0:cdf462088d13 | 1627 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.N , 16, RSA_N ) ); |
markrad | 0:cdf462088d13 | 1628 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.E , 16, RSA_E ) ); |
markrad | 0:cdf462088d13 | 1629 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.D , 16, RSA_D ) ); |
markrad | 0:cdf462088d13 | 1630 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.P , 16, RSA_P ) ); |
markrad | 0:cdf462088d13 | 1631 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.Q , 16, RSA_Q ) ); |
markrad | 0:cdf462088d13 | 1632 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.DP, 16, RSA_DP ) ); |
markrad | 0:cdf462088d13 | 1633 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.DQ, 16, RSA_DQ ) ); |
markrad | 0:cdf462088d13 | 1634 | MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.QP, 16, RSA_QP ) ); |
markrad | 0:cdf462088d13 | 1635 | |
markrad | 0:cdf462088d13 | 1636 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1637 | mbedtls_printf( " RSA key validation: " ); |
markrad | 0:cdf462088d13 | 1638 | |
markrad | 0:cdf462088d13 | 1639 | if( mbedtls_rsa_check_pubkey( &rsa ) != 0 || |
markrad | 0:cdf462088d13 | 1640 | mbedtls_rsa_check_privkey( &rsa ) != 0 ) |
markrad | 0:cdf462088d13 | 1641 | { |
markrad | 0:cdf462088d13 | 1642 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1643 | mbedtls_printf( "failed\n" ); |
markrad | 0:cdf462088d13 | 1644 | |
markrad | 0:cdf462088d13 | 1645 | return( 1 ); |
markrad | 0:cdf462088d13 | 1646 | } |
markrad | 0:cdf462088d13 | 1647 | |
markrad | 0:cdf462088d13 | 1648 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1649 | mbedtls_printf( "passed\n PKCS#1 encryption : " ); |
markrad | 0:cdf462088d13 | 1650 | |
markrad | 0:cdf462088d13 | 1651 | memcpy( rsa_plaintext, RSA_PT, PT_LEN ); |
markrad | 0:cdf462088d13 | 1652 | |
markrad | 0:cdf462088d13 | 1653 | if( mbedtls_rsa_pkcs1_encrypt( &rsa, myrand, NULL, MBEDTLS_RSA_PUBLIC, PT_LEN, |
markrad | 0:cdf462088d13 | 1654 | rsa_plaintext, rsa_ciphertext ) != 0 ) |
markrad | 0:cdf462088d13 | 1655 | { |
markrad | 0:cdf462088d13 | 1656 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1657 | mbedtls_printf( "failed\n" ); |
markrad | 0:cdf462088d13 | 1658 | |
markrad | 0:cdf462088d13 | 1659 | return( 1 ); |
markrad | 0:cdf462088d13 | 1660 | } |
markrad | 0:cdf462088d13 | 1661 | |
markrad | 0:cdf462088d13 | 1662 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1663 | mbedtls_printf( "passed\n PKCS#1 decryption : " ); |
markrad | 0:cdf462088d13 | 1664 | |
markrad | 0:cdf462088d13 | 1665 | if( mbedtls_rsa_pkcs1_decrypt( &rsa, myrand, NULL, MBEDTLS_RSA_PRIVATE, &len, |
markrad | 0:cdf462088d13 | 1666 | rsa_ciphertext, rsa_decrypted, |
markrad | 0:cdf462088d13 | 1667 | sizeof(rsa_decrypted) ) != 0 ) |
markrad | 0:cdf462088d13 | 1668 | { |
markrad | 0:cdf462088d13 | 1669 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1670 | mbedtls_printf( "failed\n" ); |
markrad | 0:cdf462088d13 | 1671 | |
markrad | 0:cdf462088d13 | 1672 | return( 1 ); |
markrad | 0:cdf462088d13 | 1673 | } |
markrad | 0:cdf462088d13 | 1674 | |
markrad | 0:cdf462088d13 | 1675 | if( memcmp( rsa_decrypted, rsa_plaintext, len ) != 0 ) |
markrad | 0:cdf462088d13 | 1676 | { |
markrad | 0:cdf462088d13 | 1677 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1678 | mbedtls_printf( "failed\n" ); |
markrad | 0:cdf462088d13 | 1679 | |
markrad | 0:cdf462088d13 | 1680 | return( 1 ); |
markrad | 0:cdf462088d13 | 1681 | } |
markrad | 0:cdf462088d13 | 1682 | |
markrad | 0:cdf462088d13 | 1683 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1684 | mbedtls_printf( "passed\n" ); |
markrad | 0:cdf462088d13 | 1685 | |
markrad | 0:cdf462088d13 | 1686 | #if defined(MBEDTLS_SHA1_C) |
markrad | 0:cdf462088d13 | 1687 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1688 | mbedtls_printf( " PKCS#1 data sign : " ); |
markrad | 0:cdf462088d13 | 1689 | |
markrad | 0:cdf462088d13 | 1690 | mbedtls_sha1( rsa_plaintext, PT_LEN, sha1sum ); |
markrad | 0:cdf462088d13 | 1691 | |
markrad | 0:cdf462088d13 | 1692 | if( mbedtls_rsa_pkcs1_sign( &rsa, myrand, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA1, 0, |
markrad | 0:cdf462088d13 | 1693 | sha1sum, rsa_ciphertext ) != 0 ) |
markrad | 0:cdf462088d13 | 1694 | { |
markrad | 0:cdf462088d13 | 1695 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1696 | mbedtls_printf( "failed\n" ); |
markrad | 0:cdf462088d13 | 1697 | |
markrad | 0:cdf462088d13 | 1698 | return( 1 ); |
markrad | 0:cdf462088d13 | 1699 | } |
markrad | 0:cdf462088d13 | 1700 | |
markrad | 0:cdf462088d13 | 1701 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1702 | mbedtls_printf( "passed\n PKCS#1 sig. verify: " ); |
markrad | 0:cdf462088d13 | 1703 | |
markrad | 0:cdf462088d13 | 1704 | if( mbedtls_rsa_pkcs1_verify( &rsa, NULL, NULL, MBEDTLS_RSA_PUBLIC, MBEDTLS_MD_SHA1, 0, |
markrad | 0:cdf462088d13 | 1705 | sha1sum, rsa_ciphertext ) != 0 ) |
markrad | 0:cdf462088d13 | 1706 | { |
markrad | 0:cdf462088d13 | 1707 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1708 | mbedtls_printf( "failed\n" ); |
markrad | 0:cdf462088d13 | 1709 | |
markrad | 0:cdf462088d13 | 1710 | return( 1 ); |
markrad | 0:cdf462088d13 | 1711 | } |
markrad | 0:cdf462088d13 | 1712 | |
markrad | 0:cdf462088d13 | 1713 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1714 | mbedtls_printf( "passed\n" ); |
markrad | 0:cdf462088d13 | 1715 | #endif /* MBEDTLS_SHA1_C */ |
markrad | 0:cdf462088d13 | 1716 | |
markrad | 0:cdf462088d13 | 1717 | if( verbose != 0 ) |
markrad | 0:cdf462088d13 | 1718 | mbedtls_printf( "\n" ); |
markrad | 0:cdf462088d13 | 1719 | |
markrad | 0:cdf462088d13 | 1720 | cleanup: |
markrad | 0:cdf462088d13 | 1721 | mbedtls_rsa_free( &rsa ); |
markrad | 0:cdf462088d13 | 1722 | #else /* MBEDTLS_PKCS1_V15 */ |
markrad | 0:cdf462088d13 | 1723 | ((void) verbose); |
markrad | 0:cdf462088d13 | 1724 | #endif /* MBEDTLS_PKCS1_V15 */ |
markrad | 0:cdf462088d13 | 1725 | return( ret ); |
markrad | 0:cdf462088d13 | 1726 | } |
markrad | 0:cdf462088d13 | 1727 | |
markrad | 0:cdf462088d13 | 1728 | #endif /* MBEDTLS_SELF_TEST */ |
markrad | 0:cdf462088d13 | 1729 | |
markrad | 0:cdf462088d13 | 1730 | #endif /* MBEDTLS_RSA_C */ |