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features/mbedtls/src/rsa.c@1:f30bdcd2b33b, 2017-02-27 (annotated)

Committer:
jacobjohnson
Date:
Mon Feb 27 17:45:05 2017 +0000
Revision:
1:f30bdcd2b33b
Parent:
0:098463de4c5d 
changed the inputscale from 1 to 7 in analogin_api.c.  This will need to be changed later, and accessed from the main level, but for now this allows the  adc to read a value from 0 to 3.7V, instead of just up to 1V.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /*
group-onsemi 0:098463de4c5d 2 * The RSA public-key cryptosystem
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
group-onsemi 0:098463de4c5d 5 * SPDX-License-Identifier: Apache-2.0
group-onsemi 0:098463de4c5d 6 *
group-onsemi 0:098463de4c5d 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
group-onsemi 0:098463de4c5d 8 * not use this file except in compliance with the License.
group-onsemi 0:098463de4c5d 9 * You may obtain a copy of the License at
group-onsemi 0:098463de4c5d 10 *
group-onsemi 0:098463de4c5d 11 * http://www.apache.org/licenses/LICENSE-2.0
group-onsemi 0:098463de4c5d 12 *
group-onsemi 0:098463de4c5d 13 * Unless required by applicable law or agreed to in writing, software
group-onsemi 0:098463de4c5d 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
group-onsemi 0:098463de4c5d 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
group-onsemi 0:098463de4c5d 16 * See the License for the specific language governing permissions and
group-onsemi 0:098463de4c5d 17 * limitations under the License.
group-onsemi 0:098463de4c5d 18 *
group-onsemi 0:098463de4c5d 19 * This file is part of mbed TLS (https://tls.mbed.org)
group-onsemi 0:098463de4c5d 20 */
group-onsemi 0:098463de4c5d 21 /*
group-onsemi 0:098463de4c5d 22 * The following sources were referenced in the design of this implementation
group-onsemi 0:098463de4c5d 23 * of the RSA algorithm:
group-onsemi 0:098463de4c5d 24 *
group-onsemi 0:098463de4c5d 25 * [1] A method for obtaining digital signatures and public-key cryptosystems
group-onsemi 0:098463de4c5d 26 * R Rivest, A Shamir, and L Adleman
group-onsemi 0:098463de4c5d 27 * http://people.csail.mit.edu/rivest/pubs.html#RSA78
group-onsemi 0:098463de4c5d 28 *
group-onsemi 0:098463de4c5d 29 * [2] Handbook of Applied Cryptography - 1997, Chapter 8
group-onsemi 0:098463de4c5d 30 * Menezes, van Oorschot and Vanstone
group-onsemi 0:098463de4c5d 31 *
group-onsemi 0:098463de4c5d 32 */
group-onsemi 0:098463de4c5d 33
group-onsemi 0:098463de4c5d 34 #if !defined(MBEDTLS_CONFIG_FILE)
group-onsemi 0:098463de4c5d 35 #include "mbedtls/config.h"
group-onsemi 0:098463de4c5d 36 #else
group-onsemi 0:098463de4c5d 37 #include MBEDTLS_CONFIG_FILE
group-onsemi 0:098463de4c5d 38 #endif
group-onsemi 0:098463de4c5d 39
group-onsemi 0:098463de4c5d 40 #if defined(MBEDTLS_RSA_C)
group-onsemi 0:098463de4c5d 41
group-onsemi 0:098463de4c5d 42 #include "mbedtls/rsa.h"
group-onsemi 0:098463de4c5d 43 #include "mbedtls/oid.h"
group-onsemi 0:098463de4c5d 44
group-onsemi 0:098463de4c5d 45 #include <string.h>
group-onsemi 0:098463de4c5d 46
group-onsemi 0:098463de4c5d 47 #if defined(MBEDTLS_PKCS1_V21)
group-onsemi 0:098463de4c5d 48 #include "mbedtls/md.h"
group-onsemi 0:098463de4c5d 49 #endif
group-onsemi 0:098463de4c5d 50
group-onsemi 0:098463de4c5d 51 #if defined(MBEDTLS_PKCS1_V15) && !defined(__OpenBSD__)
group-onsemi 0:098463de4c5d 52 #include <stdlib.h>
group-onsemi 0:098463de4c5d 53 #endif
group-onsemi 0:098463de4c5d 54
group-onsemi 0:098463de4c5d 55 #if defined(MBEDTLS_PLATFORM_C)
group-onsemi 0:098463de4c5d 56 #include "mbedtls/platform.h"
group-onsemi 0:098463de4c5d 57 #else
group-onsemi 0:098463de4c5d 58 #include <stdio.h>
group-onsemi 0:098463de4c5d 59 #define mbedtls_printf printf
group-onsemi 0:098463de4c5d 60 #define mbedtls_calloc calloc
group-onsemi 0:098463de4c5d 61 #define mbedtls_free free
group-onsemi 0:098463de4c5d 62 #endif
group-onsemi 0:098463de4c5d 63
group-onsemi 0:098463de4c5d 64 /*
group-onsemi 0:098463de4c5d 65 * Initialize an RSA context
group-onsemi 0:098463de4c5d 66 */
group-onsemi 0:098463de4c5d 67 void mbedtls_rsa_init( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 68 int padding,
group-onsemi 0:098463de4c5d 69 int hash_id )
group-onsemi 0:098463de4c5d 70 {
group-onsemi 0:098463de4c5d 71 memset( ctx, 0, sizeof( mbedtls_rsa_context ) );
group-onsemi 0:098463de4c5d 72
group-onsemi 0:098463de4c5d 73 mbedtls_rsa_set_padding( ctx, padding, hash_id );
group-onsemi 0:098463de4c5d 74
group-onsemi 0:098463de4c5d 75 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 76 mbedtls_mutex_init( &ctx->mutex );
group-onsemi 0:098463de4c5d 77 #endif
group-onsemi 0:098463de4c5d 78 }
group-onsemi 0:098463de4c5d 79
group-onsemi 0:098463de4c5d 80 /*
group-onsemi 0:098463de4c5d 81 * Set padding for an existing RSA context
group-onsemi 0:098463de4c5d 82 */
group-onsemi 0:098463de4c5d 83 void mbedtls_rsa_set_padding( mbedtls_rsa_context *ctx, int padding, int hash_id )
group-onsemi 0:098463de4c5d 84 {
group-onsemi 0:098463de4c5d 85 ctx->padding = padding;
group-onsemi 0:098463de4c5d 86 ctx->hash_id = hash_id;
group-onsemi 0:098463de4c5d 87 }
group-onsemi 0:098463de4c5d 88
group-onsemi 0:098463de4c5d 89 #if defined(MBEDTLS_GENPRIME)
group-onsemi 0:098463de4c5d 90
group-onsemi 0:098463de4c5d 91 /*
group-onsemi 0:098463de4c5d 92 * Generate an RSA keypair
group-onsemi 0:098463de4c5d 93 */
group-onsemi 0:098463de4c5d 94 int mbedtls_rsa_gen_key( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 95 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 96 void *p_rng,
group-onsemi 0:098463de4c5d 97 unsigned int nbits, int exponent )
group-onsemi 0:098463de4c5d 98 {
group-onsemi 0:098463de4c5d 99 int ret;
group-onsemi 0:098463de4c5d 100 mbedtls_mpi P1, Q1, H, G;
group-onsemi 0:098463de4c5d 101
group-onsemi 0:098463de4c5d 102 if( f_rng == NULL || nbits < 128 || exponent < 3 )
group-onsemi 0:098463de4c5d 103 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 104
group-onsemi 0:098463de4c5d 105 if( nbits % 2 )
group-onsemi 0:098463de4c5d 106 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 107
group-onsemi 0:098463de4c5d 108 mbedtls_mpi_init( &P1 ); mbedtls_mpi_init( &Q1 );
group-onsemi 0:098463de4c5d 109 mbedtls_mpi_init( &H ); mbedtls_mpi_init( &G );
group-onsemi 0:098463de4c5d 110
group-onsemi 0:098463de4c5d 111 /*
group-onsemi 0:098463de4c5d 112 * find primes P and Q with Q < P so that:
group-onsemi 0:098463de4c5d 113 * GCD( E, (P-1)*(Q-1) ) == 1
group-onsemi 0:098463de4c5d 114 */
group-onsemi 0:098463de4c5d 115 MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &ctx->E, exponent ) );
group-onsemi 0:098463de4c5d 116
group-onsemi 0:098463de4c5d 117 do
group-onsemi 0:098463de4c5d 118 {
group-onsemi 0:098463de4c5d 119 MBEDTLS_MPI_CHK( mbedtls_mpi_gen_prime( &ctx->P, nbits >> 1, 0,
group-onsemi 0:098463de4c5d 120 f_rng, p_rng ) );
group-onsemi 0:098463de4c5d 121
group-onsemi 0:098463de4c5d 122 MBEDTLS_MPI_CHK( mbedtls_mpi_gen_prime( &ctx->Q, nbits >> 1, 0,
group-onsemi 0:098463de4c5d 123 f_rng, p_rng ) );
group-onsemi 0:098463de4c5d 124
group-onsemi 0:098463de4c5d 125 if( mbedtls_mpi_cmp_mpi( &ctx->P, &ctx->Q ) == 0 )
group-onsemi 0:098463de4c5d 126 continue;
group-onsemi 0:098463de4c5d 127
group-onsemi 0:098463de4c5d 128 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->N, &ctx->P, &ctx->Q ) );
group-onsemi 0:098463de4c5d 129 if( mbedtls_mpi_bitlen( &ctx->N ) != nbits )
group-onsemi 0:098463de4c5d 130 continue;
group-onsemi 0:098463de4c5d 131
group-onsemi 0:098463de4c5d 132 if( mbedtls_mpi_cmp_mpi( &ctx->P, &ctx->Q ) < 0 )
group-onsemi 0:098463de4c5d 133 mbedtls_mpi_swap( &ctx->P, &ctx->Q );
group-onsemi 0:098463de4c5d 134
group-onsemi 0:098463de4c5d 135 MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &P1, &ctx->P, 1 ) );
group-onsemi 0:098463de4c5d 136 MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &Q1, &ctx->Q, 1 ) );
group-onsemi 0:098463de4c5d 137 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &H, &P1, &Q1 ) );
group-onsemi 0:098463de4c5d 138 MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &G, &ctx->E, &H ) );
group-onsemi 0:098463de4c5d 139 }
group-onsemi 0:098463de4c5d 140 while( mbedtls_mpi_cmp_int( &G, 1 ) != 0 );
group-onsemi 0:098463de4c5d 141
group-onsemi 0:098463de4c5d 142 /*
group-onsemi 0:098463de4c5d 143 * D = E^-1 mod ((P-1)*(Q-1))
group-onsemi 0:098463de4c5d 144 * DP = D mod (P - 1)
group-onsemi 0:098463de4c5d 145 * DQ = D mod (Q - 1)
group-onsemi 0:098463de4c5d 146 * QP = Q^-1 mod P
group-onsemi 0:098463de4c5d 147 */
group-onsemi 0:098463de4c5d 148 MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->D , &ctx->E, &H ) );
group-onsemi 0:098463de4c5d 149 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->DP, &ctx->D, &P1 ) );
group-onsemi 0:098463de4c5d 150 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->DQ, &ctx->D, &Q1 ) );
group-onsemi 0:098463de4c5d 151 MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->QP, &ctx->Q, &ctx->P ) );
group-onsemi 0:098463de4c5d 152
group-onsemi 0:098463de4c5d 153 ctx->len = ( mbedtls_mpi_bitlen( &ctx->N ) + 7 ) >> 3;
group-onsemi 0:098463de4c5d 154
group-onsemi 0:098463de4c5d 155 cleanup:
group-onsemi 0:098463de4c5d 156
group-onsemi 0:098463de4c5d 157 mbedtls_mpi_free( &P1 ); mbedtls_mpi_free( &Q1 ); mbedtls_mpi_free( &H ); mbedtls_mpi_free( &G );
group-onsemi 0:098463de4c5d 158
group-onsemi 0:098463de4c5d 159 if( ret != 0 )
group-onsemi 0:098463de4c5d 160 {
group-onsemi 0:098463de4c5d 161 mbedtls_rsa_free( ctx );
group-onsemi 0:098463de4c5d 162 return( MBEDTLS_ERR_RSA_KEY_GEN_FAILED + ret );
group-onsemi 0:098463de4c5d 163 }
group-onsemi 0:098463de4c5d 164
group-onsemi 0:098463de4c5d 165 return( 0 );
group-onsemi 0:098463de4c5d 166 }
group-onsemi 0:098463de4c5d 167
group-onsemi 0:098463de4c5d 168 #endif /* MBEDTLS_GENPRIME */
group-onsemi 0:098463de4c5d 169
group-onsemi 0:098463de4c5d 170 /*
group-onsemi 0:098463de4c5d 171 * Check a public RSA key
group-onsemi 0:098463de4c5d 172 */
group-onsemi 0:098463de4c5d 173 int mbedtls_rsa_check_pubkey( const mbedtls_rsa_context *ctx )
group-onsemi 0:098463de4c5d 174 {
group-onsemi 0:098463de4c5d 175 if( !ctx->N.p || !ctx->E.p )
group-onsemi 0:098463de4c5d 176 return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
group-onsemi 0:098463de4c5d 177
group-onsemi 0:098463de4c5d 178 if( ( ctx->N.p[0] & 1 ) == 0 ||
group-onsemi 0:098463de4c5d 179 ( ctx->E.p[0] & 1 ) == 0 )
group-onsemi 0:098463de4c5d 180 return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
group-onsemi 0:098463de4c5d 181
group-onsemi 0:098463de4c5d 182 if( mbedtls_mpi_bitlen( &ctx->N ) < 128 ||
group-onsemi 0:098463de4c5d 183 mbedtls_mpi_bitlen( &ctx->N ) > MBEDTLS_MPI_MAX_BITS )
group-onsemi 0:098463de4c5d 184 return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
group-onsemi 0:098463de4c5d 185
group-onsemi 0:098463de4c5d 186 if( mbedtls_mpi_bitlen( &ctx->E ) < 2 ||
group-onsemi 0:098463de4c5d 187 mbedtls_mpi_cmp_mpi( &ctx->E, &ctx->N ) >= 0 )
group-onsemi 0:098463de4c5d 188 return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
group-onsemi 0:098463de4c5d 189
group-onsemi 0:098463de4c5d 190 return( 0 );
group-onsemi 0:098463de4c5d 191 }
group-onsemi 0:098463de4c5d 192
group-onsemi 0:098463de4c5d 193 /*
group-onsemi 0:098463de4c5d 194 * Check a private RSA key
group-onsemi 0:098463de4c5d 195 */
group-onsemi 0:098463de4c5d 196 int mbedtls_rsa_check_privkey( const mbedtls_rsa_context *ctx )
group-onsemi 0:098463de4c5d 197 {
group-onsemi 0:098463de4c5d 198 int ret;
group-onsemi 0:098463de4c5d 199 mbedtls_mpi PQ, DE, P1, Q1, H, I, G, G2, L1, L2, DP, DQ, QP;
group-onsemi 0:098463de4c5d 200
group-onsemi 0:098463de4c5d 201 if( ( ret = mbedtls_rsa_check_pubkey( ctx ) ) != 0 )
group-onsemi 0:098463de4c5d 202 return( ret );
group-onsemi 0:098463de4c5d 203
group-onsemi 0:098463de4c5d 204 if( !ctx->P.p || !ctx->Q.p || !ctx->D.p )
group-onsemi 0:098463de4c5d 205 return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
group-onsemi 0:098463de4c5d 206
group-onsemi 0:098463de4c5d 207 mbedtls_mpi_init( &PQ ); mbedtls_mpi_init( &DE ); mbedtls_mpi_init( &P1 ); mbedtls_mpi_init( &Q1 );
group-onsemi 0:098463de4c5d 208 mbedtls_mpi_init( &H ); mbedtls_mpi_init( &I ); mbedtls_mpi_init( &G ); mbedtls_mpi_init( &G2 );
group-onsemi 0:098463de4c5d 209 mbedtls_mpi_init( &L1 ); mbedtls_mpi_init( &L2 ); mbedtls_mpi_init( &DP ); mbedtls_mpi_init( &DQ );
group-onsemi 0:098463de4c5d 210 mbedtls_mpi_init( &QP );
group-onsemi 0:098463de4c5d 211
group-onsemi 0:098463de4c5d 212 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &PQ, &ctx->P, &ctx->Q ) );
group-onsemi 0:098463de4c5d 213 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &DE, &ctx->D, &ctx->E ) );
group-onsemi 0:098463de4c5d 214 MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &P1, &ctx->P, 1 ) );
group-onsemi 0:098463de4c5d 215 MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &Q1, &ctx->Q, 1 ) );
group-onsemi 0:098463de4c5d 216 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &H, &P1, &Q1 ) );
group-onsemi 0:098463de4c5d 217 MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &G, &ctx->E, &H ) );
group-onsemi 0:098463de4c5d 218
group-onsemi 0:098463de4c5d 219 MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &G2, &P1, &Q1 ) );
group-onsemi 0:098463de4c5d 220 MBEDTLS_MPI_CHK( mbedtls_mpi_div_mpi( &L1, &L2, &H, &G2 ) );
group-onsemi 0:098463de4c5d 221 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &I, &DE, &L1 ) );
group-onsemi 0:098463de4c5d 222
group-onsemi 0:098463de4c5d 223 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &DP, &ctx->D, &P1 ) );
group-onsemi 0:098463de4c5d 224 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &DQ, &ctx->D, &Q1 ) );
group-onsemi 0:098463de4c5d 225 MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &QP, &ctx->Q, &ctx->P ) );
group-onsemi 0:098463de4c5d 226 /*
group-onsemi 0:098463de4c5d 227 * Check for a valid PKCS1v2 private key
group-onsemi 0:098463de4c5d 228 */
group-onsemi 0:098463de4c5d 229 if( mbedtls_mpi_cmp_mpi( &PQ, &ctx->N ) != 0 ||
group-onsemi 0:098463de4c5d 230 mbedtls_mpi_cmp_mpi( &DP, &ctx->DP ) != 0 ||
group-onsemi 0:098463de4c5d 231 mbedtls_mpi_cmp_mpi( &DQ, &ctx->DQ ) != 0 ||
group-onsemi 0:098463de4c5d 232 mbedtls_mpi_cmp_mpi( &QP, &ctx->QP ) != 0 ||
group-onsemi 0:098463de4c5d 233 mbedtls_mpi_cmp_int( &L2, 0 ) != 0 ||
group-onsemi 0:098463de4c5d 234 mbedtls_mpi_cmp_int( &I, 1 ) != 0 ||
group-onsemi 0:098463de4c5d 235 mbedtls_mpi_cmp_int( &G, 1 ) != 0 )
group-onsemi 0:098463de4c5d 236 {
group-onsemi 0:098463de4c5d 237 ret = MBEDTLS_ERR_RSA_KEY_CHECK_FAILED;
group-onsemi 0:098463de4c5d 238 }
group-onsemi 0:098463de4c5d 239
group-onsemi 0:098463de4c5d 240 cleanup:
group-onsemi 0:098463de4c5d 241 mbedtls_mpi_free( &PQ ); mbedtls_mpi_free( &DE ); mbedtls_mpi_free( &P1 ); mbedtls_mpi_free( &Q1 );
group-onsemi 0:098463de4c5d 242 mbedtls_mpi_free( &H ); mbedtls_mpi_free( &I ); mbedtls_mpi_free( &G ); mbedtls_mpi_free( &G2 );
group-onsemi 0:098463de4c5d 243 mbedtls_mpi_free( &L1 ); mbedtls_mpi_free( &L2 ); mbedtls_mpi_free( &DP ); mbedtls_mpi_free( &DQ );
group-onsemi 0:098463de4c5d 244 mbedtls_mpi_free( &QP );
group-onsemi 0:098463de4c5d 245
group-onsemi 0:098463de4c5d 246 if( ret == MBEDTLS_ERR_RSA_KEY_CHECK_FAILED )
group-onsemi 0:098463de4c5d 247 return( ret );
group-onsemi 0:098463de4c5d 248
group-onsemi 0:098463de4c5d 249 if( ret != 0 )
group-onsemi 0:098463de4c5d 250 return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED + ret );
group-onsemi 0:098463de4c5d 251
group-onsemi 0:098463de4c5d 252 return( 0 );
group-onsemi 0:098463de4c5d 253 }
group-onsemi 0:098463de4c5d 254
group-onsemi 0:098463de4c5d 255 /*
group-onsemi 0:098463de4c5d 256 * Check if contexts holding a public and private key match
group-onsemi 0:098463de4c5d 257 */
group-onsemi 0:098463de4c5d 258 int mbedtls_rsa_check_pub_priv( const mbedtls_rsa_context *pub, const mbedtls_rsa_context *prv )
group-onsemi 0:098463de4c5d 259 {
group-onsemi 0:098463de4c5d 260 if( mbedtls_rsa_check_pubkey( pub ) != 0 ||
group-onsemi 0:098463de4c5d 261 mbedtls_rsa_check_privkey( prv ) != 0 )
group-onsemi 0:098463de4c5d 262 {
group-onsemi 0:098463de4c5d 263 return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
group-onsemi 0:098463de4c5d 264 }
group-onsemi 0:098463de4c5d 265
group-onsemi 0:098463de4c5d 266 if( mbedtls_mpi_cmp_mpi( &pub->N, &prv->N ) != 0 ||
group-onsemi 0:098463de4c5d 267 mbedtls_mpi_cmp_mpi( &pub->E, &prv->E ) != 0 )
group-onsemi 0:098463de4c5d 268 {
group-onsemi 0:098463de4c5d 269 return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
group-onsemi 0:098463de4c5d 270 }
group-onsemi 0:098463de4c5d 271
group-onsemi 0:098463de4c5d 272 return( 0 );
group-onsemi 0:098463de4c5d 273 }
group-onsemi 0:098463de4c5d 274
group-onsemi 0:098463de4c5d 275 /*
group-onsemi 0:098463de4c5d 276 * Do an RSA public key operation
group-onsemi 0:098463de4c5d 277 */
group-onsemi 0:098463de4c5d 278 int mbedtls_rsa_public( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 279 const unsigned char *input,
group-onsemi 0:098463de4c5d 280 unsigned char *output )
group-onsemi 0:098463de4c5d 281 {
group-onsemi 0:098463de4c5d 282 int ret;
group-onsemi 0:098463de4c5d 283 size_t olen;
group-onsemi 0:098463de4c5d 284 mbedtls_mpi T;
group-onsemi 0:098463de4c5d 285
group-onsemi 0:098463de4c5d 286 mbedtls_mpi_init( &T );
group-onsemi 0:098463de4c5d 287
group-onsemi 0:098463de4c5d 288 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 289 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
group-onsemi 0:098463de4c5d 290 return( ret );
group-onsemi 0:098463de4c5d 291 #endif
group-onsemi 0:098463de4c5d 292
group-onsemi 0:098463de4c5d 293 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &T, input, ctx->len ) );
group-onsemi 0:098463de4c5d 294
group-onsemi 0:098463de4c5d 295 if( mbedtls_mpi_cmp_mpi( &T, &ctx->N ) >= 0 )
group-onsemi 0:098463de4c5d 296 {
group-onsemi 0:098463de4c5d 297 ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
group-onsemi 0:098463de4c5d 298 goto cleanup;
group-onsemi 0:098463de4c5d 299 }
group-onsemi 0:098463de4c5d 300
group-onsemi 0:098463de4c5d 301 olen = ctx->len;
group-onsemi 0:098463de4c5d 302 MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T, &T, &ctx->E, &ctx->N, &ctx->RN ) );
group-onsemi 0:098463de4c5d 303 MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &T, output, olen ) );
group-onsemi 0:098463de4c5d 304
group-onsemi 0:098463de4c5d 305 cleanup:
group-onsemi 0:098463de4c5d 306 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 307 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
group-onsemi 0:098463de4c5d 308 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
group-onsemi 0:098463de4c5d 309 #endif
group-onsemi 0:098463de4c5d 310
group-onsemi 0:098463de4c5d 311 mbedtls_mpi_free( &T );
group-onsemi 0:098463de4c5d 312
group-onsemi 0:098463de4c5d 313 if( ret != 0 )
group-onsemi 0:098463de4c5d 314 return( MBEDTLS_ERR_RSA_PUBLIC_FAILED + ret );
group-onsemi 0:098463de4c5d 315
group-onsemi 0:098463de4c5d 316 return( 0 );
group-onsemi 0:098463de4c5d 317 }
group-onsemi 0:098463de4c5d 318
group-onsemi 0:098463de4c5d 319 /*
group-onsemi 0:098463de4c5d 320 * Generate or update blinding values, see section 10 of:
group-onsemi 0:098463de4c5d 321 * KOCHER, Paul C. Timing attacks on implementations of Diffie-Hellman, RSA,
group-onsemi 0:098463de4c5d 322 * DSS, and other systems. In : Advances in Cryptology-CRYPTO'96. Springer
group-onsemi 0:098463de4c5d 323 * Berlin Heidelberg, 1996. p. 104-113.
group-onsemi 0:098463de4c5d 324 */
group-onsemi 0:098463de4c5d 325 static int rsa_prepare_blinding( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 326 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
group-onsemi 0:098463de4c5d 327 {
group-onsemi 0:098463de4c5d 328 int ret, count = 0;
group-onsemi 0:098463de4c5d 329
group-onsemi 0:098463de4c5d 330 if( ctx->Vf.p != NULL )
group-onsemi 0:098463de4c5d 331 {
group-onsemi 0:098463de4c5d 332 /* We already have blinding values, just update them by squaring */
group-onsemi 0:098463de4c5d 333 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vi, &ctx->Vi, &ctx->Vi ) );
group-onsemi 0:098463de4c5d 334 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vi, &ctx->Vi, &ctx->N ) );
group-onsemi 0:098463de4c5d 335 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vf, &ctx->Vf, &ctx->Vf ) );
group-onsemi 0:098463de4c5d 336 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vf, &ctx->Vf, &ctx->N ) );
group-onsemi 0:098463de4c5d 337
group-onsemi 0:098463de4c5d 338 goto cleanup;
group-onsemi 0:098463de4c5d 339 }
group-onsemi 0:098463de4c5d 340
group-onsemi 0:098463de4c5d 341 /* Unblinding value: Vf = random number, invertible mod N */
group-onsemi 0:098463de4c5d 342 do {
group-onsemi 0:098463de4c5d 343 if( count++ > 10 )
group-onsemi 0:098463de4c5d 344 return( MBEDTLS_ERR_RSA_RNG_FAILED );
group-onsemi 0:098463de4c5d 345
group-onsemi 0:098463de4c5d 346 MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->Vf, ctx->len - 1, f_rng, p_rng ) );
group-onsemi 0:098463de4c5d 347 MBEDTLS_MPI_CHK( mbedtls_mpi_gcd( &ctx->Vi, &ctx->Vf, &ctx->N ) );
group-onsemi 0:098463de4c5d 348 } while( mbedtls_mpi_cmp_int( &ctx->Vi, 1 ) != 0 );
group-onsemi 0:098463de4c5d 349
group-onsemi 0:098463de4c5d 350 /* Blinding value: Vi = Vf^(-e) mod N */
group-onsemi 0:098463de4c5d 351 MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->Vi, &ctx->Vf, &ctx->N ) );
group-onsemi 0:098463de4c5d 352 MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->Vi, &ctx->Vi, &ctx->E, &ctx->N, &ctx->RN ) );
group-onsemi 0:098463de4c5d 353
group-onsemi 0:098463de4c5d 354
group-onsemi 0:098463de4c5d 355 cleanup:
group-onsemi 0:098463de4c5d 356 return( ret );
group-onsemi 0:098463de4c5d 357 }
group-onsemi 0:098463de4c5d 358
group-onsemi 0:098463de4c5d 359 /*
group-onsemi 0:098463de4c5d 360 * Do an RSA private key operation
group-onsemi 0:098463de4c5d 361 */
group-onsemi 0:098463de4c5d 362 int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 363 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 364 void *p_rng,
group-onsemi 0:098463de4c5d 365 const unsigned char *input,
group-onsemi 0:098463de4c5d 366 unsigned char *output )
group-onsemi 0:098463de4c5d 367 {
group-onsemi 0:098463de4c5d 368 int ret;
group-onsemi 0:098463de4c5d 369 size_t olen;
group-onsemi 0:098463de4c5d 370 mbedtls_mpi T, T1, T2;
group-onsemi 0:098463de4c5d 371
group-onsemi 0:098463de4c5d 372 /* Make sure we have private key info, prevent possible misuse */
group-onsemi 0:098463de4c5d 373 if( ctx->P.p == NULL || ctx->Q.p == NULL || ctx->D.p == NULL )
group-onsemi 0:098463de4c5d 374 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 375
group-onsemi 0:098463de4c5d 376 mbedtls_mpi_init( &T ); mbedtls_mpi_init( &T1 ); mbedtls_mpi_init( &T2 );
group-onsemi 0:098463de4c5d 377
group-onsemi 0:098463de4c5d 378 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 379 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
group-onsemi 0:098463de4c5d 380 return( ret );
group-onsemi 0:098463de4c5d 381 #endif
group-onsemi 0:098463de4c5d 382
group-onsemi 0:098463de4c5d 383 MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &T, input, ctx->len ) );
group-onsemi 0:098463de4c5d 384 if( mbedtls_mpi_cmp_mpi( &T, &ctx->N ) >= 0 )
group-onsemi 0:098463de4c5d 385 {
group-onsemi 0:098463de4c5d 386 ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
group-onsemi 0:098463de4c5d 387 goto cleanup;
group-onsemi 0:098463de4c5d 388 }
group-onsemi 0:098463de4c5d 389
group-onsemi 0:098463de4c5d 390 if( f_rng != NULL )
group-onsemi 0:098463de4c5d 391 {
group-onsemi 0:098463de4c5d 392 /*
group-onsemi 0:098463de4c5d 393 * Blinding
group-onsemi 0:098463de4c5d 394 * T = T * Vi mod N
group-onsemi 0:098463de4c5d 395 */
group-onsemi 0:098463de4c5d 396 MBEDTLS_MPI_CHK( rsa_prepare_blinding( ctx, f_rng, p_rng ) );
group-onsemi 0:098463de4c5d 397 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T, &T, &ctx->Vi ) );
group-onsemi 0:098463de4c5d 398 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &T, &T, &ctx->N ) );
group-onsemi 0:098463de4c5d 399 }
group-onsemi 0:098463de4c5d 400
group-onsemi 0:098463de4c5d 401 #if defined(MBEDTLS_RSA_NO_CRT)
group-onsemi 0:098463de4c5d 402 MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T, &T, &ctx->D, &ctx->N, &ctx->RN ) );
group-onsemi 0:098463de4c5d 403 #else
group-onsemi 0:098463de4c5d 404 /*
group-onsemi 0:098463de4c5d 405 * faster decryption using the CRT
group-onsemi 0:098463de4c5d 406 *
group-onsemi 0:098463de4c5d 407 * T1 = input ^ dP mod P
group-onsemi 0:098463de4c5d 408 * T2 = input ^ dQ mod Q
group-onsemi 0:098463de4c5d 409 */
group-onsemi 0:098463de4c5d 410 MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T1, &T, &ctx->DP, &ctx->P, &ctx->RP ) );
group-onsemi 0:098463de4c5d 411 MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &T2, &T, &ctx->DQ, &ctx->Q, &ctx->RQ ) );
group-onsemi 0:098463de4c5d 412
group-onsemi 0:098463de4c5d 413 /*
group-onsemi 0:098463de4c5d 414 * T = (T1 - T2) * (Q^-1 mod P) mod P
group-onsemi 0:098463de4c5d 415 */
group-onsemi 0:098463de4c5d 416 MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( &T, &T1, &T2 ) );
group-onsemi 0:098463de4c5d 417 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T1, &T, &ctx->QP ) );
group-onsemi 0:098463de4c5d 418 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &T, &T1, &ctx->P ) );
group-onsemi 0:098463de4c5d 419
group-onsemi 0:098463de4c5d 420 /*
group-onsemi 0:098463de4c5d 421 * T = T2 + T * Q
group-onsemi 0:098463de4c5d 422 */
group-onsemi 0:098463de4c5d 423 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T1, &T, &ctx->Q ) );
group-onsemi 0:098463de4c5d 424 MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &T, &T2, &T1 ) );
group-onsemi 0:098463de4c5d 425 #endif /* MBEDTLS_RSA_NO_CRT */
group-onsemi 0:098463de4c5d 426
group-onsemi 0:098463de4c5d 427 if( f_rng != NULL )
group-onsemi 0:098463de4c5d 428 {
group-onsemi 0:098463de4c5d 429 /*
group-onsemi 0:098463de4c5d 430 * Unblind
group-onsemi 0:098463de4c5d 431 * T = T * Vf mod N
group-onsemi 0:098463de4c5d 432 */
group-onsemi 0:098463de4c5d 433 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &T, &T, &ctx->Vf ) );
group-onsemi 0:098463de4c5d 434 MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &T, &T, &ctx->N ) );
group-onsemi 0:098463de4c5d 435 }
group-onsemi 0:098463de4c5d 436
group-onsemi 0:098463de4c5d 437 olen = ctx->len;
group-onsemi 0:098463de4c5d 438 MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &T, output, olen ) );
group-onsemi 0:098463de4c5d 439
group-onsemi 0:098463de4c5d 440 cleanup:
group-onsemi 0:098463de4c5d 441 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 442 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
group-onsemi 0:098463de4c5d 443 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
group-onsemi 0:098463de4c5d 444 #endif
group-onsemi 0:098463de4c5d 445
group-onsemi 0:098463de4c5d 446 mbedtls_mpi_free( &T ); mbedtls_mpi_free( &T1 ); mbedtls_mpi_free( &T2 );
group-onsemi 0:098463de4c5d 447
group-onsemi 0:098463de4c5d 448 if( ret != 0 )
group-onsemi 0:098463de4c5d 449 return( MBEDTLS_ERR_RSA_PRIVATE_FAILED + ret );
group-onsemi 0:098463de4c5d 450
group-onsemi 0:098463de4c5d 451 return( 0 );
group-onsemi 0:098463de4c5d 452 }
group-onsemi 0:098463de4c5d 453
group-onsemi 0:098463de4c5d 454 #if defined(MBEDTLS_PKCS1_V21)
group-onsemi 0:098463de4c5d 455 /**
group-onsemi 0:098463de4c5d 456 * Generate and apply the MGF1 operation (from PKCS#1 v2.1) to a buffer.
group-onsemi 0:098463de4c5d 457 *
group-onsemi 0:098463de4c5d 458 * \param dst buffer to mask
group-onsemi 0:098463de4c5d 459 * \param dlen length of destination buffer
group-onsemi 0:098463de4c5d 460 * \param src source of the mask generation
group-onsemi 0:098463de4c5d 461 * \param slen length of the source buffer
group-onsemi 0:098463de4c5d 462 * \param md_ctx message digest context to use
group-onsemi 0:098463de4c5d 463 */
group-onsemi 0:098463de4c5d 464 static void mgf_mask( unsigned char *dst, size_t dlen, unsigned char *src,
group-onsemi 0:098463de4c5d 465 size_t slen, mbedtls_md_context_t *md_ctx )
group-onsemi 0:098463de4c5d 466 {
group-onsemi 0:098463de4c5d 467 unsigned char mask[MBEDTLS_MD_MAX_SIZE];
group-onsemi 0:098463de4c5d 468 unsigned char counter[4];
group-onsemi 0:098463de4c5d 469 unsigned char *p;
group-onsemi 0:098463de4c5d 470 unsigned int hlen;
group-onsemi 0:098463de4c5d 471 size_t i, use_len;
group-onsemi 0:098463de4c5d 472
group-onsemi 0:098463de4c5d 473 memset( mask, 0, MBEDTLS_MD_MAX_SIZE );
group-onsemi 0:098463de4c5d 474 memset( counter, 0, 4 );
group-onsemi 0:098463de4c5d 475
group-onsemi 0:098463de4c5d 476 hlen = mbedtls_md_get_size( md_ctx->md_info );
group-onsemi 0:098463de4c5d 477
group-onsemi 0:098463de4c5d 478 /* Generate and apply dbMask */
group-onsemi 0:098463de4c5d 479 p = dst;
group-onsemi 0:098463de4c5d 480
group-onsemi 0:098463de4c5d 481 while( dlen > 0 )
group-onsemi 0:098463de4c5d 482 {
group-onsemi 0:098463de4c5d 483 use_len = hlen;
group-onsemi 0:098463de4c5d 484 if( dlen < hlen )
group-onsemi 0:098463de4c5d 485 use_len = dlen;
group-onsemi 0:098463de4c5d 486
group-onsemi 0:098463de4c5d 487 mbedtls_md_starts( md_ctx );
group-onsemi 0:098463de4c5d 488 mbedtls_md_update( md_ctx, src, slen );
group-onsemi 0:098463de4c5d 489 mbedtls_md_update( md_ctx, counter, 4 );
group-onsemi 0:098463de4c5d 490 mbedtls_md_finish( md_ctx, mask );
group-onsemi 0:098463de4c5d 491
group-onsemi 0:098463de4c5d 492 for( i = 0; i < use_len; ++i )
group-onsemi 0:098463de4c5d 493 *p++ ^= mask[i];
group-onsemi 0:098463de4c5d 494
group-onsemi 0:098463de4c5d 495 counter[3]++;
group-onsemi 0:098463de4c5d 496
group-onsemi 0:098463de4c5d 497 dlen -= use_len;
group-onsemi 0:098463de4c5d 498 }
group-onsemi 0:098463de4c5d 499 }
group-onsemi 0:098463de4c5d 500 #endif /* MBEDTLS_PKCS1_V21 */
group-onsemi 0:098463de4c5d 501
group-onsemi 0:098463de4c5d 502 #if defined(MBEDTLS_PKCS1_V21)
group-onsemi 0:098463de4c5d 503 /*
group-onsemi 0:098463de4c5d 504 * Implementation of the PKCS#1 v2.1 RSAES-OAEP-ENCRYPT function
group-onsemi 0:098463de4c5d 505 */
group-onsemi 0:098463de4c5d 506 int mbedtls_rsa_rsaes_oaep_encrypt( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 507 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 508 void *p_rng,
group-onsemi 0:098463de4c5d 509 int mode,
group-onsemi 0:098463de4c5d 510 const unsigned char *label, size_t label_len,
group-onsemi 0:098463de4c5d 511 size_t ilen,
group-onsemi 0:098463de4c5d 512 const unsigned char *input,
group-onsemi 0:098463de4c5d 513 unsigned char *output )
group-onsemi 0:098463de4c5d 514 {
group-onsemi 0:098463de4c5d 515 size_t olen;
group-onsemi 0:098463de4c5d 516 int ret;
group-onsemi 0:098463de4c5d 517 unsigned char *p = output;
group-onsemi 0:098463de4c5d 518 unsigned int hlen;
group-onsemi 0:098463de4c5d 519 const mbedtls_md_info_t *md_info;
group-onsemi 0:098463de4c5d 520 mbedtls_md_context_t md_ctx;
group-onsemi 0:098463de4c5d 521
group-onsemi 0:098463de4c5d 522 if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 )
group-onsemi 0:098463de4c5d 523 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 524
group-onsemi 0:098463de4c5d 525 if( f_rng == NULL )
group-onsemi 0:098463de4c5d 526 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 527
group-onsemi 0:098463de4c5d 528 md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id );
group-onsemi 0:098463de4c5d 529 if( md_info == NULL )
group-onsemi 0:098463de4c5d 530 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 531
group-onsemi 0:098463de4c5d 532 olen = ctx->len;
group-onsemi 0:098463de4c5d 533 hlen = mbedtls_md_get_size( md_info );
group-onsemi 0:098463de4c5d 534
group-onsemi 0:098463de4c5d 535 /* first comparison checks for overflow */
group-onsemi 0:098463de4c5d 536 if( ilen + 2 * hlen + 2 < ilen || olen < ilen + 2 * hlen + 2 )
group-onsemi 0:098463de4c5d 537 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 538
group-onsemi 0:098463de4c5d 539 memset( output, 0, olen );
group-onsemi 0:098463de4c5d 540
group-onsemi 0:098463de4c5d 541 *p++ = 0;
group-onsemi 0:098463de4c5d 542
group-onsemi 0:098463de4c5d 543 /* Generate a random octet string seed */
group-onsemi 0:098463de4c5d 544 if( ( ret = f_rng( p_rng, p, hlen ) ) != 0 )
group-onsemi 0:098463de4c5d 545 return( MBEDTLS_ERR_RSA_RNG_FAILED + ret );
group-onsemi 0:098463de4c5d 546
group-onsemi 0:098463de4c5d 547 p += hlen;
group-onsemi 0:098463de4c5d 548
group-onsemi 0:098463de4c5d 549 /* Construct DB */
group-onsemi 0:098463de4c5d 550 mbedtls_md( md_info, label, label_len, p );
group-onsemi 0:098463de4c5d 551 p += hlen;
group-onsemi 0:098463de4c5d 552 p += olen - 2 * hlen - 2 - ilen;
group-onsemi 0:098463de4c5d 553 *p++ = 1;
group-onsemi 0:098463de4c5d 554 memcpy( p, input, ilen );
group-onsemi 0:098463de4c5d 555
group-onsemi 0:098463de4c5d 556 mbedtls_md_init( &md_ctx );
group-onsemi 0:098463de4c5d 557 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
group-onsemi 0:098463de4c5d 558 {
group-onsemi 0:098463de4c5d 559 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 560 return( ret );
group-onsemi 0:098463de4c5d 561 }
group-onsemi 0:098463de4c5d 562
group-onsemi 0:098463de4c5d 563 /* maskedDB: Apply dbMask to DB */
group-onsemi 0:098463de4c5d 564 mgf_mask( output + hlen + 1, olen - hlen - 1, output + 1, hlen,
group-onsemi 0:098463de4c5d 565 &md_ctx );
group-onsemi 0:098463de4c5d 566
group-onsemi 0:098463de4c5d 567 /* maskedSeed: Apply seedMask to seed */
group-onsemi 0:098463de4c5d 568 mgf_mask( output + 1, hlen, output + hlen + 1, olen - hlen - 1,
group-onsemi 0:098463de4c5d 569 &md_ctx );
group-onsemi 0:098463de4c5d 570
group-onsemi 0:098463de4c5d 571 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 572
group-onsemi 0:098463de4c5d 573 return( ( mode == MBEDTLS_RSA_PUBLIC )
group-onsemi 0:098463de4c5d 574 ? mbedtls_rsa_public( ctx, output, output )
group-onsemi 0:098463de4c5d 575 : mbedtls_rsa_private( ctx, f_rng, p_rng, output, output ) );
group-onsemi 0:098463de4c5d 576 }
group-onsemi 0:098463de4c5d 577 #endif /* MBEDTLS_PKCS1_V21 */
group-onsemi 0:098463de4c5d 578
group-onsemi 0:098463de4c5d 579 #if defined(MBEDTLS_PKCS1_V15)
group-onsemi 0:098463de4c5d 580 /*
group-onsemi 0:098463de4c5d 581 * Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-ENCRYPT function
group-onsemi 0:098463de4c5d 582 */
group-onsemi 0:098463de4c5d 583 int mbedtls_rsa_rsaes_pkcs1_v15_encrypt( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 584 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 585 void *p_rng,
group-onsemi 0:098463de4c5d 586 int mode, size_t ilen,
group-onsemi 0:098463de4c5d 587 const unsigned char *input,
group-onsemi 0:098463de4c5d 588 unsigned char *output )
group-onsemi 0:098463de4c5d 589 {
group-onsemi 0:098463de4c5d 590 size_t nb_pad, olen;
group-onsemi 0:098463de4c5d 591 int ret;
group-onsemi 0:098463de4c5d 592 unsigned char *p = output;
group-onsemi 0:098463de4c5d 593
group-onsemi 0:098463de4c5d 594 if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
group-onsemi 0:098463de4c5d 595 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 596
group-onsemi 0:098463de4c5d 597 // We don't check p_rng because it won't be dereferenced here
group-onsemi 0:098463de4c5d 598 if( f_rng == NULL || input == NULL || output == NULL )
group-onsemi 0:098463de4c5d 599 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 600
group-onsemi 0:098463de4c5d 601 olen = ctx->len;
group-onsemi 0:098463de4c5d 602
group-onsemi 0:098463de4c5d 603 /* first comparison checks for overflow */
group-onsemi 0:098463de4c5d 604 if( ilen + 11 < ilen || olen < ilen + 11 )
group-onsemi 0:098463de4c5d 605 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 606
group-onsemi 0:098463de4c5d 607 nb_pad = olen - 3 - ilen;
group-onsemi 0:098463de4c5d 608
group-onsemi 0:098463de4c5d 609 *p++ = 0;
group-onsemi 0:098463de4c5d 610 if( mode == MBEDTLS_RSA_PUBLIC )
group-onsemi 0:098463de4c5d 611 {
group-onsemi 0:098463de4c5d 612 *p++ = MBEDTLS_RSA_CRYPT;
group-onsemi 0:098463de4c5d 613
group-onsemi 0:098463de4c5d 614 while( nb_pad-- > 0 )
group-onsemi 0:098463de4c5d 615 {
group-onsemi 0:098463de4c5d 616 int rng_dl = 100;
group-onsemi 0:098463de4c5d 617
group-onsemi 0:098463de4c5d 618 do {
group-onsemi 0:098463de4c5d 619 ret = f_rng( p_rng, p, 1 );
group-onsemi 0:098463de4c5d 620 } while( *p == 0 && --rng_dl && ret == 0 );
group-onsemi 0:098463de4c5d 621
group-onsemi 0:098463de4c5d 622 /* Check if RNG failed to generate data */
group-onsemi 0:098463de4c5d 623 if( rng_dl == 0 || ret != 0 )
group-onsemi 0:098463de4c5d 624 return( MBEDTLS_ERR_RSA_RNG_FAILED + ret );
group-onsemi 0:098463de4c5d 625
group-onsemi 0:098463de4c5d 626 p++;
group-onsemi 0:098463de4c5d 627 }
group-onsemi 0:098463de4c5d 628 }
group-onsemi 0:098463de4c5d 629 else
group-onsemi 0:098463de4c5d 630 {
group-onsemi 0:098463de4c5d 631 *p++ = MBEDTLS_RSA_SIGN;
group-onsemi 0:098463de4c5d 632
group-onsemi 0:098463de4c5d 633 while( nb_pad-- > 0 )
group-onsemi 0:098463de4c5d 634 *p++ = 0xFF;
group-onsemi 0:098463de4c5d 635 }
group-onsemi 0:098463de4c5d 636
group-onsemi 0:098463de4c5d 637 *p++ = 0;
group-onsemi 0:098463de4c5d 638 memcpy( p, input, ilen );
group-onsemi 0:098463de4c5d 639
group-onsemi 0:098463de4c5d 640 return( ( mode == MBEDTLS_RSA_PUBLIC )
group-onsemi 0:098463de4c5d 641 ? mbedtls_rsa_public( ctx, output, output )
group-onsemi 0:098463de4c5d 642 : mbedtls_rsa_private( ctx, f_rng, p_rng, output, output ) );
group-onsemi 0:098463de4c5d 643 }
group-onsemi 0:098463de4c5d 644 #endif /* MBEDTLS_PKCS1_V15 */
group-onsemi 0:098463de4c5d 645
group-onsemi 0:098463de4c5d 646 /*
group-onsemi 0:098463de4c5d 647 * Add the message padding, then do an RSA operation
group-onsemi 0:098463de4c5d 648 */
group-onsemi 0:098463de4c5d 649 int mbedtls_rsa_pkcs1_encrypt( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 650 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 651 void *p_rng,
group-onsemi 0:098463de4c5d 652 int mode, size_t ilen,
group-onsemi 0:098463de4c5d 653 const unsigned char *input,
group-onsemi 0:098463de4c5d 654 unsigned char *output )
group-onsemi 0:098463de4c5d 655 {
group-onsemi 0:098463de4c5d 656 switch( ctx->padding )
group-onsemi 0:098463de4c5d 657 {
group-onsemi 0:098463de4c5d 658 #if defined(MBEDTLS_PKCS1_V15)
group-onsemi 0:098463de4c5d 659 case MBEDTLS_RSA_PKCS_V15:
group-onsemi 0:098463de4c5d 660 return mbedtls_rsa_rsaes_pkcs1_v15_encrypt( ctx, f_rng, p_rng, mode, ilen,
group-onsemi 0:098463de4c5d 661 input, output );
group-onsemi 0:098463de4c5d 662 #endif
group-onsemi 0:098463de4c5d 663
group-onsemi 0:098463de4c5d 664 #if defined(MBEDTLS_PKCS1_V21)
group-onsemi 0:098463de4c5d 665 case MBEDTLS_RSA_PKCS_V21:
group-onsemi 0:098463de4c5d 666 return mbedtls_rsa_rsaes_oaep_encrypt( ctx, f_rng, p_rng, mode, NULL, 0,
group-onsemi 0:098463de4c5d 667 ilen, input, output );
group-onsemi 0:098463de4c5d 668 #endif
group-onsemi 0:098463de4c5d 669
group-onsemi 0:098463de4c5d 670 default:
group-onsemi 0:098463de4c5d 671 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 672 }
group-onsemi 0:098463de4c5d 673 }
group-onsemi 0:098463de4c5d 674
group-onsemi 0:098463de4c5d 675 #if defined(MBEDTLS_PKCS1_V21)
group-onsemi 0:098463de4c5d 676 /*
group-onsemi 0:098463de4c5d 677 * Implementation of the PKCS#1 v2.1 RSAES-OAEP-DECRYPT function
group-onsemi 0:098463de4c5d 678 */
group-onsemi 0:098463de4c5d 679 int mbedtls_rsa_rsaes_oaep_decrypt( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 680 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 681 void *p_rng,
group-onsemi 0:098463de4c5d 682 int mode,
group-onsemi 0:098463de4c5d 683 const unsigned char *label, size_t label_len,
group-onsemi 0:098463de4c5d 684 size_t *olen,
group-onsemi 0:098463de4c5d 685 const unsigned char *input,
group-onsemi 0:098463de4c5d 686 unsigned char *output,
group-onsemi 0:098463de4c5d 687 size_t output_max_len )
group-onsemi 0:098463de4c5d 688 {
group-onsemi 0:098463de4c5d 689 int ret;
group-onsemi 0:098463de4c5d 690 size_t ilen, i, pad_len;
group-onsemi 0:098463de4c5d 691 unsigned char *p, bad, pad_done;
group-onsemi 0:098463de4c5d 692 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
group-onsemi 0:098463de4c5d 693 unsigned char lhash[MBEDTLS_MD_MAX_SIZE];
group-onsemi 0:098463de4c5d 694 unsigned int hlen;
group-onsemi 0:098463de4c5d 695 const mbedtls_md_info_t *md_info;
group-onsemi 0:098463de4c5d 696 mbedtls_md_context_t md_ctx;
group-onsemi 0:098463de4c5d 697
group-onsemi 0:098463de4c5d 698 /*
group-onsemi 0:098463de4c5d 699 * Parameters sanity checks
group-onsemi 0:098463de4c5d 700 */
group-onsemi 0:098463de4c5d 701 if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 )
group-onsemi 0:098463de4c5d 702 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 703
group-onsemi 0:098463de4c5d 704 ilen = ctx->len;
group-onsemi 0:098463de4c5d 705
group-onsemi 0:098463de4c5d 706 if( ilen < 16 || ilen > sizeof( buf ) )
group-onsemi 0:098463de4c5d 707 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 708
group-onsemi 0:098463de4c5d 709 md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id );
group-onsemi 0:098463de4c5d 710 if( md_info == NULL )
group-onsemi 0:098463de4c5d 711 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 712
group-onsemi 0:098463de4c5d 713 hlen = mbedtls_md_get_size( md_info );
group-onsemi 0:098463de4c5d 714
group-onsemi 0:098463de4c5d 715 // checking for integer underflow
group-onsemi 0:098463de4c5d 716 if( 2 * hlen + 2 > ilen )
group-onsemi 0:098463de4c5d 717 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 718
group-onsemi 0:098463de4c5d 719 /*
group-onsemi 0:098463de4c5d 720 * RSA operation
group-onsemi 0:098463de4c5d 721 */
group-onsemi 0:098463de4c5d 722 ret = ( mode == MBEDTLS_RSA_PUBLIC )
group-onsemi 0:098463de4c5d 723 ? mbedtls_rsa_public( ctx, input, buf )
group-onsemi 0:098463de4c5d 724 : mbedtls_rsa_private( ctx, f_rng, p_rng, input, buf );
group-onsemi 0:098463de4c5d 725
group-onsemi 0:098463de4c5d 726 if( ret != 0 )
group-onsemi 0:098463de4c5d 727 return( ret );
group-onsemi 0:098463de4c5d 728
group-onsemi 0:098463de4c5d 729 /*
group-onsemi 0:098463de4c5d 730 * Unmask data and generate lHash
group-onsemi 0:098463de4c5d 731 */
group-onsemi 0:098463de4c5d 732 mbedtls_md_init( &md_ctx );
group-onsemi 0:098463de4c5d 733 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
group-onsemi 0:098463de4c5d 734 {
group-onsemi 0:098463de4c5d 735 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 736 return( ret );
group-onsemi 0:098463de4c5d 737 }
group-onsemi 0:098463de4c5d 738
group-onsemi 0:098463de4c5d 739
group-onsemi 0:098463de4c5d 740 /* Generate lHash */
group-onsemi 0:098463de4c5d 741 mbedtls_md( md_info, label, label_len, lhash );
group-onsemi 0:098463de4c5d 742
group-onsemi 0:098463de4c5d 743 /* seed: Apply seedMask to maskedSeed */
group-onsemi 0:098463de4c5d 744 mgf_mask( buf + 1, hlen, buf + hlen + 1, ilen - hlen - 1,
group-onsemi 0:098463de4c5d 745 &md_ctx );
group-onsemi 0:098463de4c5d 746
group-onsemi 0:098463de4c5d 747 /* DB: Apply dbMask to maskedDB */
group-onsemi 0:098463de4c5d 748 mgf_mask( buf + hlen + 1, ilen - hlen - 1, buf + 1, hlen,
group-onsemi 0:098463de4c5d 749 &md_ctx );
group-onsemi 0:098463de4c5d 750
group-onsemi 0:098463de4c5d 751 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 752
group-onsemi 0:098463de4c5d 753 /*
group-onsemi 0:098463de4c5d 754 * Check contents, in "constant-time"
group-onsemi 0:098463de4c5d 755 */
group-onsemi 0:098463de4c5d 756 p = buf;
group-onsemi 0:098463de4c5d 757 bad = 0;
group-onsemi 0:098463de4c5d 758
group-onsemi 0:098463de4c5d 759 bad |= *p++; /* First byte must be 0 */
group-onsemi 0:098463de4c5d 760
group-onsemi 0:098463de4c5d 761 p += hlen; /* Skip seed */
group-onsemi 0:098463de4c5d 762
group-onsemi 0:098463de4c5d 763 /* Check lHash */
group-onsemi 0:098463de4c5d 764 for( i = 0; i < hlen; i++ )
group-onsemi 0:098463de4c5d 765 bad |= lhash[i] ^ *p++;
group-onsemi 0:098463de4c5d 766
group-onsemi 0:098463de4c5d 767 /* Get zero-padding len, but always read till end of buffer
group-onsemi 0:098463de4c5d 768 * (minus one, for the 01 byte) */
group-onsemi 0:098463de4c5d 769 pad_len = 0;
group-onsemi 0:098463de4c5d 770 pad_done = 0;
group-onsemi 0:098463de4c5d 771 for( i = 0; i < ilen - 2 * hlen - 2; i++ )
group-onsemi 0:098463de4c5d 772 {
group-onsemi 0:098463de4c5d 773 pad_done |= p[i];
group-onsemi 0:098463de4c5d 774 pad_len += ((pad_done | (unsigned char)-pad_done) >> 7) ^ 1;
group-onsemi 0:098463de4c5d 775 }
group-onsemi 0:098463de4c5d 776
group-onsemi 0:098463de4c5d 777 p += pad_len;
group-onsemi 0:098463de4c5d 778 bad |= *p++ ^ 0x01;
group-onsemi 0:098463de4c5d 779
group-onsemi 0:098463de4c5d 780 /*
group-onsemi 0:098463de4c5d 781 * The only information "leaked" is whether the padding was correct or not
group-onsemi 0:098463de4c5d 782 * (eg, no data is copied if it was not correct). This meets the
group-onsemi 0:098463de4c5d 783 * recommendations in PKCS#1 v2.2: an opponent cannot distinguish between
group-onsemi 0:098463de4c5d 784 * the different error conditions.
group-onsemi 0:098463de4c5d 785 */
group-onsemi 0:098463de4c5d 786 if( bad != 0 )
group-onsemi 0:098463de4c5d 787 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 788
group-onsemi 0:098463de4c5d 789 if( ilen - ( p - buf ) > output_max_len )
group-onsemi 0:098463de4c5d 790 return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
group-onsemi 0:098463de4c5d 791
group-onsemi 0:098463de4c5d 792 *olen = ilen - (p - buf);
group-onsemi 0:098463de4c5d 793 memcpy( output, p, *olen );
group-onsemi 0:098463de4c5d 794
group-onsemi 0:098463de4c5d 795 return( 0 );
group-onsemi 0:098463de4c5d 796 }
group-onsemi 0:098463de4c5d 797 #endif /* MBEDTLS_PKCS1_V21 */
group-onsemi 0:098463de4c5d 798
group-onsemi 0:098463de4c5d 799 #if defined(MBEDTLS_PKCS1_V15)
group-onsemi 0:098463de4c5d 800 /*
group-onsemi 0:098463de4c5d 801 * Implementation of the PKCS#1 v2.1 RSAES-PKCS1-V1_5-DECRYPT function
group-onsemi 0:098463de4c5d 802 */
group-onsemi 0:098463de4c5d 803 int mbedtls_rsa_rsaes_pkcs1_v15_decrypt( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 804 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 805 void *p_rng,
group-onsemi 0:098463de4c5d 806 int mode, size_t *olen,
group-onsemi 0:098463de4c5d 807 const unsigned char *input,
group-onsemi 0:098463de4c5d 808 unsigned char *output,
group-onsemi 0:098463de4c5d 809 size_t output_max_len)
group-onsemi 0:098463de4c5d 810 {
group-onsemi 0:098463de4c5d 811 int ret;
group-onsemi 0:098463de4c5d 812 size_t ilen, pad_count = 0, i;
group-onsemi 0:098463de4c5d 813 unsigned char *p, bad, pad_done = 0;
group-onsemi 0:098463de4c5d 814 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
group-onsemi 0:098463de4c5d 815
group-onsemi 0:098463de4c5d 816 if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
group-onsemi 0:098463de4c5d 817 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 818
group-onsemi 0:098463de4c5d 819 ilen = ctx->len;
group-onsemi 0:098463de4c5d 820
group-onsemi 0:098463de4c5d 821 if( ilen < 16 || ilen > sizeof( buf ) )
group-onsemi 0:098463de4c5d 822 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 823
group-onsemi 0:098463de4c5d 824 ret = ( mode == MBEDTLS_RSA_PUBLIC )
group-onsemi 0:098463de4c5d 825 ? mbedtls_rsa_public( ctx, input, buf )
group-onsemi 0:098463de4c5d 826 : mbedtls_rsa_private( ctx, f_rng, p_rng, input, buf );
group-onsemi 0:098463de4c5d 827
group-onsemi 0:098463de4c5d 828 if( ret != 0 )
group-onsemi 0:098463de4c5d 829 return( ret );
group-onsemi 0:098463de4c5d 830
group-onsemi 0:098463de4c5d 831 p = buf;
group-onsemi 0:098463de4c5d 832 bad = 0;
group-onsemi 0:098463de4c5d 833
group-onsemi 0:098463de4c5d 834 /*
group-onsemi 0:098463de4c5d 835 * Check and get padding len in "constant-time"
group-onsemi 0:098463de4c5d 836 */
group-onsemi 0:098463de4c5d 837 bad |= *p++; /* First byte must be 0 */
group-onsemi 0:098463de4c5d 838
group-onsemi 0:098463de4c5d 839 /* This test does not depend on secret data */
group-onsemi 0:098463de4c5d 840 if( mode == MBEDTLS_RSA_PRIVATE )
group-onsemi 0:098463de4c5d 841 {
group-onsemi 0:098463de4c5d 842 bad |= *p++ ^ MBEDTLS_RSA_CRYPT;
group-onsemi 0:098463de4c5d 843
group-onsemi 0:098463de4c5d 844 /* Get padding len, but always read till end of buffer
group-onsemi 0:098463de4c5d 845 * (minus one, for the 00 byte) */
group-onsemi 0:098463de4c5d 846 for( i = 0; i < ilen - 3; i++ )
group-onsemi 0:098463de4c5d 847 {
group-onsemi 0:098463de4c5d 848 pad_done |= ((p[i] | (unsigned char)-p[i]) >> 7) ^ 1;
group-onsemi 0:098463de4c5d 849 pad_count += ((pad_done | (unsigned char)-pad_done) >> 7) ^ 1;
group-onsemi 0:098463de4c5d 850 }
group-onsemi 0:098463de4c5d 851
group-onsemi 0:098463de4c5d 852 p += pad_count;
group-onsemi 0:098463de4c5d 853 bad |= *p++; /* Must be zero */
group-onsemi 0:098463de4c5d 854 }
group-onsemi 0:098463de4c5d 855 else
group-onsemi 0:098463de4c5d 856 {
group-onsemi 0:098463de4c5d 857 bad |= *p++ ^ MBEDTLS_RSA_SIGN;
group-onsemi 0:098463de4c5d 858
group-onsemi 0:098463de4c5d 859 /* Get padding len, but always read till end of buffer
group-onsemi 0:098463de4c5d 860 * (minus one, for the 00 byte) */
group-onsemi 0:098463de4c5d 861 for( i = 0; i < ilen - 3; i++ )
group-onsemi 0:098463de4c5d 862 {
group-onsemi 0:098463de4c5d 863 pad_done |= ( p[i] != 0xFF );
group-onsemi 0:098463de4c5d 864 pad_count += ( pad_done == 0 );
group-onsemi 0:098463de4c5d 865 }
group-onsemi 0:098463de4c5d 866
group-onsemi 0:098463de4c5d 867 p += pad_count;
group-onsemi 0:098463de4c5d 868 bad |= *p++; /* Must be zero */
group-onsemi 0:098463de4c5d 869 }
group-onsemi 0:098463de4c5d 870
group-onsemi 0:098463de4c5d 871 bad |= ( pad_count < 8 );
group-onsemi 0:098463de4c5d 872
group-onsemi 0:098463de4c5d 873 if( bad )
group-onsemi 0:098463de4c5d 874 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 875
group-onsemi 0:098463de4c5d 876 if( ilen - ( p - buf ) > output_max_len )
group-onsemi 0:098463de4c5d 877 return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
group-onsemi 0:098463de4c5d 878
group-onsemi 0:098463de4c5d 879 *olen = ilen - (p - buf);
group-onsemi 0:098463de4c5d 880 memcpy( output, p, *olen );
group-onsemi 0:098463de4c5d 881
group-onsemi 0:098463de4c5d 882 return( 0 );
group-onsemi 0:098463de4c5d 883 }
group-onsemi 0:098463de4c5d 884 #endif /* MBEDTLS_PKCS1_V15 */
group-onsemi 0:098463de4c5d 885
group-onsemi 0:098463de4c5d 886 /*
group-onsemi 0:098463de4c5d 887 * Do an RSA operation, then remove the message padding
group-onsemi 0:098463de4c5d 888 */
group-onsemi 0:098463de4c5d 889 int mbedtls_rsa_pkcs1_decrypt( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 890 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 891 void *p_rng,
group-onsemi 0:098463de4c5d 892 int mode, size_t *olen,
group-onsemi 0:098463de4c5d 893 const unsigned char *input,
group-onsemi 0:098463de4c5d 894 unsigned char *output,
group-onsemi 0:098463de4c5d 895 size_t output_max_len)
group-onsemi 0:098463de4c5d 896 {
group-onsemi 0:098463de4c5d 897 switch( ctx->padding )
group-onsemi 0:098463de4c5d 898 {
group-onsemi 0:098463de4c5d 899 #if defined(MBEDTLS_PKCS1_V15)
group-onsemi 0:098463de4c5d 900 case MBEDTLS_RSA_PKCS_V15:
group-onsemi 0:098463de4c5d 901 return mbedtls_rsa_rsaes_pkcs1_v15_decrypt( ctx, f_rng, p_rng, mode, olen,
group-onsemi 0:098463de4c5d 902 input, output, output_max_len );
group-onsemi 0:098463de4c5d 903 #endif
group-onsemi 0:098463de4c5d 904
group-onsemi 0:098463de4c5d 905 #if defined(MBEDTLS_PKCS1_V21)
group-onsemi 0:098463de4c5d 906 case MBEDTLS_RSA_PKCS_V21:
group-onsemi 0:098463de4c5d 907 return mbedtls_rsa_rsaes_oaep_decrypt( ctx, f_rng, p_rng, mode, NULL, 0,
group-onsemi 0:098463de4c5d 908 olen, input, output,
group-onsemi 0:098463de4c5d 909 output_max_len );
group-onsemi 0:098463de4c5d 910 #endif
group-onsemi 0:098463de4c5d 911
group-onsemi 0:098463de4c5d 912 default:
group-onsemi 0:098463de4c5d 913 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 914 }
group-onsemi 0:098463de4c5d 915 }
group-onsemi 0:098463de4c5d 916
group-onsemi 0:098463de4c5d 917 #if defined(MBEDTLS_PKCS1_V21)
group-onsemi 0:098463de4c5d 918 /*
group-onsemi 0:098463de4c5d 919 * Implementation of the PKCS#1 v2.1 RSASSA-PSS-SIGN function
group-onsemi 0:098463de4c5d 920 */
group-onsemi 0:098463de4c5d 921 int mbedtls_rsa_rsassa_pss_sign( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 922 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 923 void *p_rng,
group-onsemi 0:098463de4c5d 924 int mode,
group-onsemi 0:098463de4c5d 925 mbedtls_md_type_t md_alg,
group-onsemi 0:098463de4c5d 926 unsigned int hashlen,
group-onsemi 0:098463de4c5d 927 const unsigned char *hash,
group-onsemi 0:098463de4c5d 928 unsigned char *sig )
group-onsemi 0:098463de4c5d 929 {
group-onsemi 0:098463de4c5d 930 size_t olen;
group-onsemi 0:098463de4c5d 931 unsigned char *p = sig;
group-onsemi 0:098463de4c5d 932 unsigned char salt[MBEDTLS_MD_MAX_SIZE];
group-onsemi 0:098463de4c5d 933 unsigned int slen, hlen, offset = 0;
group-onsemi 0:098463de4c5d 934 int ret;
group-onsemi 0:098463de4c5d 935 size_t msb;
group-onsemi 0:098463de4c5d 936 const mbedtls_md_info_t *md_info;
group-onsemi 0:098463de4c5d 937 mbedtls_md_context_t md_ctx;
group-onsemi 0:098463de4c5d 938
group-onsemi 0:098463de4c5d 939 if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 )
group-onsemi 0:098463de4c5d 940 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 941
group-onsemi 0:098463de4c5d 942 if( f_rng == NULL )
group-onsemi 0:098463de4c5d 943 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 944
group-onsemi 0:098463de4c5d 945 olen = ctx->len;
group-onsemi 0:098463de4c5d 946
group-onsemi 0:098463de4c5d 947 if( md_alg != MBEDTLS_MD_NONE )
group-onsemi 0:098463de4c5d 948 {
group-onsemi 0:098463de4c5d 949 /* Gather length of hash to sign */
group-onsemi 0:098463de4c5d 950 md_info = mbedtls_md_info_from_type( md_alg );
group-onsemi 0:098463de4c5d 951 if( md_info == NULL )
group-onsemi 0:098463de4c5d 952 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 953
group-onsemi 0:098463de4c5d 954 hashlen = mbedtls_md_get_size( md_info );
group-onsemi 0:098463de4c5d 955 }
group-onsemi 0:098463de4c5d 956
group-onsemi 0:098463de4c5d 957 md_info = mbedtls_md_info_from_type( (mbedtls_md_type_t) ctx->hash_id );
group-onsemi 0:098463de4c5d 958 if( md_info == NULL )
group-onsemi 0:098463de4c5d 959 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 960
group-onsemi 0:098463de4c5d 961 hlen = mbedtls_md_get_size( md_info );
group-onsemi 0:098463de4c5d 962 slen = hlen;
group-onsemi 0:098463de4c5d 963
group-onsemi 0:098463de4c5d 964 if( olen < hlen + slen + 2 )
group-onsemi 0:098463de4c5d 965 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 966
group-onsemi 0:098463de4c5d 967 memset( sig, 0, olen );
group-onsemi 0:098463de4c5d 968
group-onsemi 0:098463de4c5d 969 /* Generate salt of length slen */
group-onsemi 0:098463de4c5d 970 if( ( ret = f_rng( p_rng, salt, slen ) ) != 0 )
group-onsemi 0:098463de4c5d 971 return( MBEDTLS_ERR_RSA_RNG_FAILED + ret );
group-onsemi 0:098463de4c5d 972
group-onsemi 0:098463de4c5d 973 /* Note: EMSA-PSS encoding is over the length of N - 1 bits */
group-onsemi 0:098463de4c5d 974 msb = mbedtls_mpi_bitlen( &ctx->N ) - 1;
group-onsemi 0:098463de4c5d 975 p += olen - hlen * 2 - 2;
group-onsemi 0:098463de4c5d 976 *p++ = 0x01;
group-onsemi 0:098463de4c5d 977 memcpy( p, salt, slen );
group-onsemi 0:098463de4c5d 978 p += slen;
group-onsemi 0:098463de4c5d 979
group-onsemi 0:098463de4c5d 980 mbedtls_md_init( &md_ctx );
group-onsemi 0:098463de4c5d 981 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
group-onsemi 0:098463de4c5d 982 {
group-onsemi 0:098463de4c5d 983 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 984 return( ret );
group-onsemi 0:098463de4c5d 985 }
group-onsemi 0:098463de4c5d 986
group-onsemi 0:098463de4c5d 987 /* Generate H = Hash( M' ) */
group-onsemi 0:098463de4c5d 988 mbedtls_md_starts( &md_ctx );
group-onsemi 0:098463de4c5d 989 mbedtls_md_update( &md_ctx, p, 8 );
group-onsemi 0:098463de4c5d 990 mbedtls_md_update( &md_ctx, hash, hashlen );
group-onsemi 0:098463de4c5d 991 mbedtls_md_update( &md_ctx, salt, slen );
group-onsemi 0:098463de4c5d 992 mbedtls_md_finish( &md_ctx, p );
group-onsemi 0:098463de4c5d 993
group-onsemi 0:098463de4c5d 994 /* Compensate for boundary condition when applying mask */
group-onsemi 0:098463de4c5d 995 if( msb % 8 == 0 )
group-onsemi 0:098463de4c5d 996 offset = 1;
group-onsemi 0:098463de4c5d 997
group-onsemi 0:098463de4c5d 998 /* maskedDB: Apply dbMask to DB */
group-onsemi 0:098463de4c5d 999 mgf_mask( sig + offset, olen - hlen - 1 - offset, p, hlen, &md_ctx );
group-onsemi 0:098463de4c5d 1000
group-onsemi 0:098463de4c5d 1001 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 1002
group-onsemi 0:098463de4c5d 1003 msb = mbedtls_mpi_bitlen( &ctx->N ) - 1;
group-onsemi 0:098463de4c5d 1004 sig[0] &= 0xFF >> ( olen * 8 - msb );
group-onsemi 0:098463de4c5d 1005
group-onsemi 0:098463de4c5d 1006 p += hlen;
group-onsemi 0:098463de4c5d 1007 *p++ = 0xBC;
group-onsemi 0:098463de4c5d 1008
group-onsemi 0:098463de4c5d 1009 return( ( mode == MBEDTLS_RSA_PUBLIC )
group-onsemi 0:098463de4c5d 1010 ? mbedtls_rsa_public( ctx, sig, sig )
group-onsemi 0:098463de4c5d 1011 : mbedtls_rsa_private( ctx, f_rng, p_rng, sig, sig ) );
group-onsemi 0:098463de4c5d 1012 }
group-onsemi 0:098463de4c5d 1013 #endif /* MBEDTLS_PKCS1_V21 */
group-onsemi 0:098463de4c5d 1014
group-onsemi 0:098463de4c5d 1015 #if defined(MBEDTLS_PKCS1_V15)
group-onsemi 0:098463de4c5d 1016 /*
group-onsemi 0:098463de4c5d 1017 * Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-V1_5-SIGN function
group-onsemi 0:098463de4c5d 1018 */
group-onsemi 0:098463de4c5d 1019 /*
group-onsemi 0:098463de4c5d 1020 * Do an RSA operation to sign the message digest
group-onsemi 0:098463de4c5d 1021 */
group-onsemi 0:098463de4c5d 1022 int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 1023 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 1024 void *p_rng,
group-onsemi 0:098463de4c5d 1025 int mode,
group-onsemi 0:098463de4c5d 1026 mbedtls_md_type_t md_alg,
group-onsemi 0:098463de4c5d 1027 unsigned int hashlen,
group-onsemi 0:098463de4c5d 1028 const unsigned char *hash,
group-onsemi 0:098463de4c5d 1029 unsigned char *sig )
group-onsemi 0:098463de4c5d 1030 {
group-onsemi 0:098463de4c5d 1031 size_t nb_pad, olen, oid_size = 0;
group-onsemi 0:098463de4c5d 1032 unsigned char *p = sig;
group-onsemi 0:098463de4c5d 1033 const char *oid = NULL;
group-onsemi 0:098463de4c5d 1034 unsigned char *sig_try = NULL, *verif = NULL;
group-onsemi 0:098463de4c5d 1035 size_t i;
group-onsemi 0:098463de4c5d 1036 unsigned char diff;
group-onsemi 0:098463de4c5d 1037 volatile unsigned char diff_no_optimize;
group-onsemi 0:098463de4c5d 1038 int ret;
group-onsemi 0:098463de4c5d 1039
group-onsemi 0:098463de4c5d 1040 if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
group-onsemi 0:098463de4c5d 1041 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1042
group-onsemi 0:098463de4c5d 1043 olen = ctx->len;
group-onsemi 0:098463de4c5d 1044 nb_pad = olen - 3;
group-onsemi 0:098463de4c5d 1045
group-onsemi 0:098463de4c5d 1046 if( md_alg != MBEDTLS_MD_NONE )
group-onsemi 0:098463de4c5d 1047 {
group-onsemi 0:098463de4c5d 1048 const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg );
group-onsemi 0:098463de4c5d 1049 if( md_info == NULL )
group-onsemi 0:098463de4c5d 1050 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1051
group-onsemi 0:098463de4c5d 1052 if( mbedtls_oid_get_oid_by_md( md_alg, &oid, &oid_size ) != 0 )
group-onsemi 0:098463de4c5d 1053 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1054
group-onsemi 0:098463de4c5d 1055 nb_pad -= 10 + oid_size;
group-onsemi 0:098463de4c5d 1056
group-onsemi 0:098463de4c5d 1057 hashlen = mbedtls_md_get_size( md_info );
group-onsemi 0:098463de4c5d 1058 }
group-onsemi 0:098463de4c5d 1059
group-onsemi 0:098463de4c5d 1060 nb_pad -= hashlen;
group-onsemi 0:098463de4c5d 1061
group-onsemi 0:098463de4c5d 1062 if( ( nb_pad < 8 ) || ( nb_pad > olen ) )
group-onsemi 0:098463de4c5d 1063 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1064
group-onsemi 0:098463de4c5d 1065 *p++ = 0;
group-onsemi 0:098463de4c5d 1066 *p++ = MBEDTLS_RSA_SIGN;
group-onsemi 0:098463de4c5d 1067 memset( p, 0xFF, nb_pad );
group-onsemi 0:098463de4c5d 1068 p += nb_pad;
group-onsemi 0:098463de4c5d 1069 *p++ = 0;
group-onsemi 0:098463de4c5d 1070
group-onsemi 0:098463de4c5d 1071 if( md_alg == MBEDTLS_MD_NONE )
group-onsemi 0:098463de4c5d 1072 {
group-onsemi 0:098463de4c5d 1073 memcpy( p, hash, hashlen );
group-onsemi 0:098463de4c5d 1074 }
group-onsemi 0:098463de4c5d 1075 else
group-onsemi 0:098463de4c5d 1076 {
group-onsemi 0:098463de4c5d 1077 /*
group-onsemi 0:098463de4c5d 1078 * DigestInfo ::= SEQUENCE {
group-onsemi 0:098463de4c5d 1079 * digestAlgorithm DigestAlgorithmIdentifier,
group-onsemi 0:098463de4c5d 1080 * digest Digest }
group-onsemi 0:098463de4c5d 1081 *
group-onsemi 0:098463de4c5d 1082 * DigestAlgorithmIdentifier ::= AlgorithmIdentifier
group-onsemi 0:098463de4c5d 1083 *
group-onsemi 0:098463de4c5d 1084 * Digest ::= OCTET STRING
group-onsemi 0:098463de4c5d 1085 */
group-onsemi 0:098463de4c5d 1086 *p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED;
group-onsemi 0:098463de4c5d 1087 *p++ = (unsigned char) ( 0x08 + oid_size + hashlen );
group-onsemi 0:098463de4c5d 1088 *p++ = MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED;
group-onsemi 0:098463de4c5d 1089 *p++ = (unsigned char) ( 0x04 + oid_size );
group-onsemi 0:098463de4c5d 1090 *p++ = MBEDTLS_ASN1_OID;
group-onsemi 0:098463de4c5d 1091 *p++ = oid_size & 0xFF;
group-onsemi 0:098463de4c5d 1092 memcpy( p, oid, oid_size );
group-onsemi 0:098463de4c5d 1093 p += oid_size;
group-onsemi 0:098463de4c5d 1094 *p++ = MBEDTLS_ASN1_NULL;
group-onsemi 0:098463de4c5d 1095 *p++ = 0x00;
group-onsemi 0:098463de4c5d 1096 *p++ = MBEDTLS_ASN1_OCTET_STRING;
group-onsemi 0:098463de4c5d 1097 *p++ = hashlen;
group-onsemi 0:098463de4c5d 1098 memcpy( p, hash, hashlen );
group-onsemi 0:098463de4c5d 1099 }
group-onsemi 0:098463de4c5d 1100
group-onsemi 0:098463de4c5d 1101 if( mode == MBEDTLS_RSA_PUBLIC )
group-onsemi 0:098463de4c5d 1102 return( mbedtls_rsa_public( ctx, sig, sig ) );
group-onsemi 0:098463de4c5d 1103
group-onsemi 0:098463de4c5d 1104 /*
group-onsemi 0:098463de4c5d 1105 * In order to prevent Lenstra's attack, make the signature in a
group-onsemi 0:098463de4c5d 1106 * temporary buffer and check it before returning it.
group-onsemi 0:098463de4c5d 1107 */
group-onsemi 0:098463de4c5d 1108 sig_try = mbedtls_calloc( 1, ctx->len );
group-onsemi 0:098463de4c5d 1109 if( sig_try == NULL )
group-onsemi 0:098463de4c5d 1110 return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
group-onsemi 0:098463de4c5d 1111
group-onsemi 0:098463de4c5d 1112 verif = mbedtls_calloc( 1, ctx->len );
group-onsemi 0:098463de4c5d 1113 if( verif == NULL )
group-onsemi 0:098463de4c5d 1114 {
group-onsemi 0:098463de4c5d 1115 mbedtls_free( sig_try );
group-onsemi 0:098463de4c5d 1116 return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
group-onsemi 0:098463de4c5d 1117 }
group-onsemi 0:098463de4c5d 1118
group-onsemi 0:098463de4c5d 1119 MBEDTLS_MPI_CHK( mbedtls_rsa_private( ctx, f_rng, p_rng, sig, sig_try ) );
group-onsemi 0:098463de4c5d 1120 MBEDTLS_MPI_CHK( mbedtls_rsa_public( ctx, sig_try, verif ) );
group-onsemi 0:098463de4c5d 1121
group-onsemi 0:098463de4c5d 1122 /* Compare in constant time just in case */
group-onsemi 0:098463de4c5d 1123 for( diff = 0, i = 0; i < ctx->len; i++ )
group-onsemi 0:098463de4c5d 1124 diff |= verif[i] ^ sig[i];
group-onsemi 0:098463de4c5d 1125 diff_no_optimize = diff;
group-onsemi 0:098463de4c5d 1126
group-onsemi 0:098463de4c5d 1127 if( diff_no_optimize != 0 )
group-onsemi 0:098463de4c5d 1128 {
group-onsemi 0:098463de4c5d 1129 ret = MBEDTLS_ERR_RSA_PRIVATE_FAILED;
group-onsemi 0:098463de4c5d 1130 goto cleanup;
group-onsemi 0:098463de4c5d 1131 }
group-onsemi 0:098463de4c5d 1132
group-onsemi 0:098463de4c5d 1133 memcpy( sig, sig_try, ctx->len );
group-onsemi 0:098463de4c5d 1134
group-onsemi 0:098463de4c5d 1135 cleanup:
group-onsemi 0:098463de4c5d 1136 mbedtls_free( sig_try );
group-onsemi 0:098463de4c5d 1137 mbedtls_free( verif );
group-onsemi 0:098463de4c5d 1138
group-onsemi 0:098463de4c5d 1139 return( ret );
group-onsemi 0:098463de4c5d 1140 }
group-onsemi 0:098463de4c5d 1141 #endif /* MBEDTLS_PKCS1_V15 */
group-onsemi 0:098463de4c5d 1142
group-onsemi 0:098463de4c5d 1143 /*
group-onsemi 0:098463de4c5d 1144 * Do an RSA operation to sign the message digest
group-onsemi 0:098463de4c5d 1145 */
group-onsemi 0:098463de4c5d 1146 int mbedtls_rsa_pkcs1_sign( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 1147 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 1148 void *p_rng,
group-onsemi 0:098463de4c5d 1149 int mode,
group-onsemi 0:098463de4c5d 1150 mbedtls_md_type_t md_alg,
group-onsemi 0:098463de4c5d 1151 unsigned int hashlen,
group-onsemi 0:098463de4c5d 1152 const unsigned char *hash,
group-onsemi 0:098463de4c5d 1153 unsigned char *sig )
group-onsemi 0:098463de4c5d 1154 {
group-onsemi 0:098463de4c5d 1155 switch( ctx->padding )
group-onsemi 0:098463de4c5d 1156 {
group-onsemi 0:098463de4c5d 1157 #if defined(MBEDTLS_PKCS1_V15)
group-onsemi 0:098463de4c5d 1158 case MBEDTLS_RSA_PKCS_V15:
group-onsemi 0:098463de4c5d 1159 return mbedtls_rsa_rsassa_pkcs1_v15_sign( ctx, f_rng, p_rng, mode, md_alg,
group-onsemi 0:098463de4c5d 1160 hashlen, hash, sig );
group-onsemi 0:098463de4c5d 1161 #endif
group-onsemi 0:098463de4c5d 1162
group-onsemi 0:098463de4c5d 1163 #if defined(MBEDTLS_PKCS1_V21)
group-onsemi 0:098463de4c5d 1164 case MBEDTLS_RSA_PKCS_V21:
group-onsemi 0:098463de4c5d 1165 return mbedtls_rsa_rsassa_pss_sign( ctx, f_rng, p_rng, mode, md_alg,
group-onsemi 0:098463de4c5d 1166 hashlen, hash, sig );
group-onsemi 0:098463de4c5d 1167 #endif
group-onsemi 0:098463de4c5d 1168
group-onsemi 0:098463de4c5d 1169 default:
group-onsemi 0:098463de4c5d 1170 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 1171 }
group-onsemi 0:098463de4c5d 1172 }
group-onsemi 0:098463de4c5d 1173
group-onsemi 0:098463de4c5d 1174 #if defined(MBEDTLS_PKCS1_V21)
group-onsemi 0:098463de4c5d 1175 /*
group-onsemi 0:098463de4c5d 1176 * Implementation of the PKCS#1 v2.1 RSASSA-PSS-VERIFY function
group-onsemi 0:098463de4c5d 1177 */
group-onsemi 0:098463de4c5d 1178 int mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 1179 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 1180 void *p_rng,
group-onsemi 0:098463de4c5d 1181 int mode,
group-onsemi 0:098463de4c5d 1182 mbedtls_md_type_t md_alg,
group-onsemi 0:098463de4c5d 1183 unsigned int hashlen,
group-onsemi 0:098463de4c5d 1184 const unsigned char *hash,
group-onsemi 0:098463de4c5d 1185 mbedtls_md_type_t mgf1_hash_id,
group-onsemi 0:098463de4c5d 1186 int expected_salt_len,
group-onsemi 0:098463de4c5d 1187 const unsigned char *sig )
group-onsemi 0:098463de4c5d 1188 {
group-onsemi 0:098463de4c5d 1189 int ret;
group-onsemi 0:098463de4c5d 1190 size_t siglen;
group-onsemi 0:098463de4c5d 1191 unsigned char *p;
group-onsemi 0:098463de4c5d 1192 unsigned char result[MBEDTLS_MD_MAX_SIZE];
group-onsemi 0:098463de4c5d 1193 unsigned char zeros[8];
group-onsemi 0:098463de4c5d 1194 unsigned int hlen;
group-onsemi 0:098463de4c5d 1195 size_t slen, msb;
group-onsemi 0:098463de4c5d 1196 const mbedtls_md_info_t *md_info;
group-onsemi 0:098463de4c5d 1197 mbedtls_md_context_t md_ctx;
group-onsemi 0:098463de4c5d 1198 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
group-onsemi 0:098463de4c5d 1199
group-onsemi 0:098463de4c5d 1200 if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V21 )
group-onsemi 0:098463de4c5d 1201 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1202
group-onsemi 0:098463de4c5d 1203 siglen = ctx->len;
group-onsemi 0:098463de4c5d 1204
group-onsemi 0:098463de4c5d 1205 if( siglen < 16 || siglen > sizeof( buf ) )
group-onsemi 0:098463de4c5d 1206 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1207
group-onsemi 0:098463de4c5d 1208 ret = ( mode == MBEDTLS_RSA_PUBLIC )
group-onsemi 0:098463de4c5d 1209 ? mbedtls_rsa_public( ctx, sig, buf )
group-onsemi 0:098463de4c5d 1210 : mbedtls_rsa_private( ctx, f_rng, p_rng, sig, buf );
group-onsemi 0:098463de4c5d 1211
group-onsemi 0:098463de4c5d 1212 if( ret != 0 )
group-onsemi 0:098463de4c5d 1213 return( ret );
group-onsemi 0:098463de4c5d 1214
group-onsemi 0:098463de4c5d 1215 p = buf;
group-onsemi 0:098463de4c5d 1216
group-onsemi 0:098463de4c5d 1217 if( buf[siglen - 1] != 0xBC )
group-onsemi 0:098463de4c5d 1218 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 1219
group-onsemi 0:098463de4c5d 1220 if( md_alg != MBEDTLS_MD_NONE )
group-onsemi 0:098463de4c5d 1221 {
group-onsemi 0:098463de4c5d 1222 /* Gather length of hash to sign */
group-onsemi 0:098463de4c5d 1223 md_info = mbedtls_md_info_from_type( md_alg );
group-onsemi 0:098463de4c5d 1224 if( md_info == NULL )
group-onsemi 0:098463de4c5d 1225 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1226
group-onsemi 0:098463de4c5d 1227 hashlen = mbedtls_md_get_size( md_info );
group-onsemi 0:098463de4c5d 1228 }
group-onsemi 0:098463de4c5d 1229
group-onsemi 0:098463de4c5d 1230 md_info = mbedtls_md_info_from_type( mgf1_hash_id );
group-onsemi 0:098463de4c5d 1231 if( md_info == NULL )
group-onsemi 0:098463de4c5d 1232 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1233
group-onsemi 0:098463de4c5d 1234 hlen = mbedtls_md_get_size( md_info );
group-onsemi 0:098463de4c5d 1235 slen = siglen - hlen - 1; /* Currently length of salt + padding */
group-onsemi 0:098463de4c5d 1236
group-onsemi 0:098463de4c5d 1237 memset( zeros, 0, 8 );
group-onsemi 0:098463de4c5d 1238
group-onsemi 0:098463de4c5d 1239 /*
group-onsemi 0:098463de4c5d 1240 * Note: EMSA-PSS verification is over the length of N - 1 bits
group-onsemi 0:098463de4c5d 1241 */
group-onsemi 0:098463de4c5d 1242 msb = mbedtls_mpi_bitlen( &ctx->N ) - 1;
group-onsemi 0:098463de4c5d 1243
group-onsemi 0:098463de4c5d 1244 /* Compensate for boundary condition when applying mask */
group-onsemi 0:098463de4c5d 1245 if( msb % 8 == 0 )
group-onsemi 0:098463de4c5d 1246 {
group-onsemi 0:098463de4c5d 1247 p++;
group-onsemi 0:098463de4c5d 1248 siglen -= 1;
group-onsemi 0:098463de4c5d 1249 }
group-onsemi 0:098463de4c5d 1250 if( buf[0] >> ( 8 - siglen * 8 + msb ) )
group-onsemi 0:098463de4c5d 1251 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1252
group-onsemi 0:098463de4c5d 1253 mbedtls_md_init( &md_ctx );
group-onsemi 0:098463de4c5d 1254 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 0 ) ) != 0 )
group-onsemi 0:098463de4c5d 1255 {
group-onsemi 0:098463de4c5d 1256 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 1257 return( ret );
group-onsemi 0:098463de4c5d 1258 }
group-onsemi 0:098463de4c5d 1259
group-onsemi 0:098463de4c5d 1260 mgf_mask( p, siglen - hlen - 1, p + siglen - hlen - 1, hlen, &md_ctx );
group-onsemi 0:098463de4c5d 1261
group-onsemi 0:098463de4c5d 1262 buf[0] &= 0xFF >> ( siglen * 8 - msb );
group-onsemi 0:098463de4c5d 1263
group-onsemi 0:098463de4c5d 1264 while( p < buf + siglen && *p == 0 )
group-onsemi 0:098463de4c5d 1265 p++;
group-onsemi 0:098463de4c5d 1266
group-onsemi 0:098463de4c5d 1267 if( p == buf + siglen ||
group-onsemi 0:098463de4c5d 1268 *p++ != 0x01 )
group-onsemi 0:098463de4c5d 1269 {
group-onsemi 0:098463de4c5d 1270 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 1271 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 1272 }
group-onsemi 0:098463de4c5d 1273
group-onsemi 0:098463de4c5d 1274 /* Actual salt len */
group-onsemi 0:098463de4c5d 1275 slen -= p - buf;
group-onsemi 0:098463de4c5d 1276
group-onsemi 0:098463de4c5d 1277 if( expected_salt_len != MBEDTLS_RSA_SALT_LEN_ANY &&
group-onsemi 0:098463de4c5d 1278 slen != (size_t) expected_salt_len )
group-onsemi 0:098463de4c5d 1279 {
group-onsemi 0:098463de4c5d 1280 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 1281 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 1282 }
group-onsemi 0:098463de4c5d 1283
group-onsemi 0:098463de4c5d 1284 /*
group-onsemi 0:098463de4c5d 1285 * Generate H = Hash( M' )
group-onsemi 0:098463de4c5d 1286 */
group-onsemi 0:098463de4c5d 1287 mbedtls_md_starts( &md_ctx );
group-onsemi 0:098463de4c5d 1288 mbedtls_md_update( &md_ctx, zeros, 8 );
group-onsemi 0:098463de4c5d 1289 mbedtls_md_update( &md_ctx, hash, hashlen );
group-onsemi 0:098463de4c5d 1290 mbedtls_md_update( &md_ctx, p, slen );
group-onsemi 0:098463de4c5d 1291 mbedtls_md_finish( &md_ctx, result );
group-onsemi 0:098463de4c5d 1292
group-onsemi 0:098463de4c5d 1293 mbedtls_md_free( &md_ctx );
group-onsemi 0:098463de4c5d 1294
group-onsemi 0:098463de4c5d 1295 if( memcmp( p + slen, result, hlen ) == 0 )
group-onsemi 0:098463de4c5d 1296 return( 0 );
group-onsemi 0:098463de4c5d 1297 else
group-onsemi 0:098463de4c5d 1298 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1299 }
group-onsemi 0:098463de4c5d 1300
group-onsemi 0:098463de4c5d 1301 /*
group-onsemi 0:098463de4c5d 1302 * Simplified PKCS#1 v2.1 RSASSA-PSS-VERIFY function
group-onsemi 0:098463de4c5d 1303 */
group-onsemi 0:098463de4c5d 1304 int mbedtls_rsa_rsassa_pss_verify( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 1305 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 1306 void *p_rng,
group-onsemi 0:098463de4c5d 1307 int mode,
group-onsemi 0:098463de4c5d 1308 mbedtls_md_type_t md_alg,
group-onsemi 0:098463de4c5d 1309 unsigned int hashlen,
group-onsemi 0:098463de4c5d 1310 const unsigned char *hash,
group-onsemi 0:098463de4c5d 1311 const unsigned char *sig )
group-onsemi 0:098463de4c5d 1312 {
group-onsemi 0:098463de4c5d 1313 mbedtls_md_type_t mgf1_hash_id = ( ctx->hash_id != MBEDTLS_MD_NONE )
group-onsemi 0:098463de4c5d 1314 ? (mbedtls_md_type_t) ctx->hash_id
group-onsemi 0:098463de4c5d 1315 : md_alg;
group-onsemi 0:098463de4c5d 1316
group-onsemi 0:098463de4c5d 1317 return( mbedtls_rsa_rsassa_pss_verify_ext( ctx, f_rng, p_rng, mode,
group-onsemi 0:098463de4c5d 1318 md_alg, hashlen, hash,
group-onsemi 0:098463de4c5d 1319 mgf1_hash_id, MBEDTLS_RSA_SALT_LEN_ANY,
group-onsemi 0:098463de4c5d 1320 sig ) );
group-onsemi 0:098463de4c5d 1321
group-onsemi 0:098463de4c5d 1322 }
group-onsemi 0:098463de4c5d 1323 #endif /* MBEDTLS_PKCS1_V21 */
group-onsemi 0:098463de4c5d 1324
group-onsemi 0:098463de4c5d 1325 #if defined(MBEDTLS_PKCS1_V15)
group-onsemi 0:098463de4c5d 1326 /*
group-onsemi 0:098463de4c5d 1327 * Implementation of the PKCS#1 v2.1 RSASSA-PKCS1-v1_5-VERIFY function
group-onsemi 0:098463de4c5d 1328 */
group-onsemi 0:098463de4c5d 1329 int mbedtls_rsa_rsassa_pkcs1_v15_verify( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 1330 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 1331 void *p_rng,
group-onsemi 0:098463de4c5d 1332 int mode,
group-onsemi 0:098463de4c5d 1333 mbedtls_md_type_t md_alg,
group-onsemi 0:098463de4c5d 1334 unsigned int hashlen,
group-onsemi 0:098463de4c5d 1335 const unsigned char *hash,
group-onsemi 0:098463de4c5d 1336 const unsigned char *sig )
group-onsemi 0:098463de4c5d 1337 {
group-onsemi 0:098463de4c5d 1338 int ret;
group-onsemi 0:098463de4c5d 1339 size_t len, siglen, asn1_len;
group-onsemi 0:098463de4c5d 1340 unsigned char *p, *end;
group-onsemi 0:098463de4c5d 1341 mbedtls_md_type_t msg_md_alg;
group-onsemi 0:098463de4c5d 1342 const mbedtls_md_info_t *md_info;
group-onsemi 0:098463de4c5d 1343 mbedtls_asn1_buf oid;
group-onsemi 0:098463de4c5d 1344 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
group-onsemi 0:098463de4c5d 1345
group-onsemi 0:098463de4c5d 1346 if( mode == MBEDTLS_RSA_PRIVATE && ctx->padding != MBEDTLS_RSA_PKCS_V15 )
group-onsemi 0:098463de4c5d 1347 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1348
group-onsemi 0:098463de4c5d 1349 siglen = ctx->len;
group-onsemi 0:098463de4c5d 1350
group-onsemi 0:098463de4c5d 1351 if( siglen < 16 || siglen > sizeof( buf ) )
group-onsemi 0:098463de4c5d 1352 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1353
group-onsemi 0:098463de4c5d 1354 ret = ( mode == MBEDTLS_RSA_PUBLIC )
group-onsemi 0:098463de4c5d 1355 ? mbedtls_rsa_public( ctx, sig, buf )
group-onsemi 0:098463de4c5d 1356 : mbedtls_rsa_private( ctx, f_rng, p_rng, sig, buf );
group-onsemi 0:098463de4c5d 1357
group-onsemi 0:098463de4c5d 1358 if( ret != 0 )
group-onsemi 0:098463de4c5d 1359 return( ret );
group-onsemi 0:098463de4c5d 1360
group-onsemi 0:098463de4c5d 1361 p = buf;
group-onsemi 0:098463de4c5d 1362
group-onsemi 0:098463de4c5d 1363 if( *p++ != 0 || *p++ != MBEDTLS_RSA_SIGN )
group-onsemi 0:098463de4c5d 1364 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 1365
group-onsemi 0:098463de4c5d 1366 while( *p != 0 )
group-onsemi 0:098463de4c5d 1367 {
group-onsemi 0:098463de4c5d 1368 if( p >= buf + siglen - 1 || *p != 0xFF )
group-onsemi 0:098463de4c5d 1369 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 1370 p++;
group-onsemi 0:098463de4c5d 1371 }
group-onsemi 0:098463de4c5d 1372 p++;
group-onsemi 0:098463de4c5d 1373
group-onsemi 0:098463de4c5d 1374 len = siglen - ( p - buf );
group-onsemi 0:098463de4c5d 1375
group-onsemi 0:098463de4c5d 1376 if( len == hashlen && md_alg == MBEDTLS_MD_NONE )
group-onsemi 0:098463de4c5d 1377 {
group-onsemi 0:098463de4c5d 1378 if( memcmp( p, hash, hashlen ) == 0 )
group-onsemi 0:098463de4c5d 1379 return( 0 );
group-onsemi 0:098463de4c5d 1380 else
group-onsemi 0:098463de4c5d 1381 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1382 }
group-onsemi 0:098463de4c5d 1383
group-onsemi 0:098463de4c5d 1384 md_info = mbedtls_md_info_from_type( md_alg );
group-onsemi 0:098463de4c5d 1385 if( md_info == NULL )
group-onsemi 0:098463de4c5d 1386 return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
group-onsemi 0:098463de4c5d 1387 hashlen = mbedtls_md_get_size( md_info );
group-onsemi 0:098463de4c5d 1388
group-onsemi 0:098463de4c5d 1389 end = p + len;
group-onsemi 0:098463de4c5d 1390
group-onsemi 0:098463de4c5d 1391 /*
group-onsemi 0:098463de4c5d 1392 * Parse the ASN.1 structure inside the PKCS#1 v1.5 structure
group-onsemi 0:098463de4c5d 1393 */
group-onsemi 0:098463de4c5d 1394 if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len,
group-onsemi 0:098463de4c5d 1395 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
group-onsemi 0:098463de4c5d 1396 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1397
group-onsemi 0:098463de4c5d 1398 if( asn1_len + 2 != len )
group-onsemi 0:098463de4c5d 1399 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1400
group-onsemi 0:098463de4c5d 1401 if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len,
group-onsemi 0:098463de4c5d 1402 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
group-onsemi 0:098463de4c5d 1403 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1404
group-onsemi 0:098463de4c5d 1405 if( asn1_len + 6 + hashlen != len )
group-onsemi 0:098463de4c5d 1406 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1407
group-onsemi 0:098463de4c5d 1408 if( ( ret = mbedtls_asn1_get_tag( &p, end, &oid.len, MBEDTLS_ASN1_OID ) ) != 0 )
group-onsemi 0:098463de4c5d 1409 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1410
group-onsemi 0:098463de4c5d 1411 oid.p = p;
group-onsemi 0:098463de4c5d 1412 p += oid.len;
group-onsemi 0:098463de4c5d 1413
group-onsemi 0:098463de4c5d 1414 if( mbedtls_oid_get_md_alg( &oid, &msg_md_alg ) != 0 )
group-onsemi 0:098463de4c5d 1415 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1416
group-onsemi 0:098463de4c5d 1417 if( md_alg != msg_md_alg )
group-onsemi 0:098463de4c5d 1418 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1419
group-onsemi 0:098463de4c5d 1420 /*
group-onsemi 0:098463de4c5d 1421 * assume the algorithm parameters must be NULL
group-onsemi 0:098463de4c5d 1422 */
group-onsemi 0:098463de4c5d 1423 if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len, MBEDTLS_ASN1_NULL ) ) != 0 )
group-onsemi 0:098463de4c5d 1424 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1425
group-onsemi 0:098463de4c5d 1426 if( ( ret = mbedtls_asn1_get_tag( &p, end, &asn1_len, MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
group-onsemi 0:098463de4c5d 1427 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1428
group-onsemi 0:098463de4c5d 1429 if( asn1_len != hashlen )
group-onsemi 0:098463de4c5d 1430 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1431
group-onsemi 0:098463de4c5d 1432 if( memcmp( p, hash, hashlen ) != 0 )
group-onsemi 0:098463de4c5d 1433 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1434
group-onsemi 0:098463de4c5d 1435 p += hashlen;
group-onsemi 0:098463de4c5d 1436
group-onsemi 0:098463de4c5d 1437 if( p != end )
group-onsemi 0:098463de4c5d 1438 return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
group-onsemi 0:098463de4c5d 1439
group-onsemi 0:098463de4c5d 1440 return( 0 );
group-onsemi 0:098463de4c5d 1441 }
group-onsemi 0:098463de4c5d 1442 #endif /* MBEDTLS_PKCS1_V15 */
group-onsemi 0:098463de4c5d 1443
group-onsemi 0:098463de4c5d 1444 /*
group-onsemi 0:098463de4c5d 1445 * Do an RSA operation and check the message digest
group-onsemi 0:098463de4c5d 1446 */
group-onsemi 0:098463de4c5d 1447 int mbedtls_rsa_pkcs1_verify( mbedtls_rsa_context *ctx,
group-onsemi 0:098463de4c5d 1448 int (*f_rng)(void *, unsigned char *, size_t),
group-onsemi 0:098463de4c5d 1449 void *p_rng,
group-onsemi 0:098463de4c5d 1450 int mode,
group-onsemi 0:098463de4c5d 1451 mbedtls_md_type_t md_alg,
group-onsemi 0:098463de4c5d 1452 unsigned int hashlen,
group-onsemi 0:098463de4c5d 1453 const unsigned char *hash,
group-onsemi 0:098463de4c5d 1454 const unsigned char *sig )
group-onsemi 0:098463de4c5d 1455 {
group-onsemi 0:098463de4c5d 1456 switch( ctx->padding )
group-onsemi 0:098463de4c5d 1457 {
group-onsemi 0:098463de4c5d 1458 #if defined(MBEDTLS_PKCS1_V15)
group-onsemi 0:098463de4c5d 1459 case MBEDTLS_RSA_PKCS_V15:
group-onsemi 0:098463de4c5d 1460 return mbedtls_rsa_rsassa_pkcs1_v15_verify( ctx, f_rng, p_rng, mode, md_alg,
group-onsemi 0:098463de4c5d 1461 hashlen, hash, sig );
group-onsemi 0:098463de4c5d 1462 #endif
group-onsemi 0:098463de4c5d 1463
group-onsemi 0:098463de4c5d 1464 #if defined(MBEDTLS_PKCS1_V21)
group-onsemi 0:098463de4c5d 1465 case MBEDTLS_RSA_PKCS_V21:
group-onsemi 0:098463de4c5d 1466 return mbedtls_rsa_rsassa_pss_verify( ctx, f_rng, p_rng, mode, md_alg,
group-onsemi 0:098463de4c5d 1467 hashlen, hash, sig );
group-onsemi 0:098463de4c5d 1468 #endif
group-onsemi 0:098463de4c5d 1469
group-onsemi 0:098463de4c5d 1470 default:
group-onsemi 0:098463de4c5d 1471 return( MBEDTLS_ERR_RSA_INVALID_PADDING );
group-onsemi 0:098463de4c5d 1472 }
group-onsemi 0:098463de4c5d 1473 }
group-onsemi 0:098463de4c5d 1474
group-onsemi 0:098463de4c5d 1475 /*
group-onsemi 0:098463de4c5d 1476 * Copy the components of an RSA key
group-onsemi 0:098463de4c5d 1477 */
group-onsemi 0:098463de4c5d 1478 int mbedtls_rsa_copy( mbedtls_rsa_context *dst, const mbedtls_rsa_context *src )
group-onsemi 0:098463de4c5d 1479 {
group-onsemi 0:098463de4c5d 1480 int ret;
group-onsemi 0:098463de4c5d 1481
group-onsemi 0:098463de4c5d 1482 dst->ver = src->ver;
group-onsemi 0:098463de4c5d 1483 dst->len = src->len;
group-onsemi 0:098463de4c5d 1484
group-onsemi 0:098463de4c5d 1485 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->N, &src->N ) );
group-onsemi 0:098463de4c5d 1486 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->E, &src->E ) );
group-onsemi 0:098463de4c5d 1487
group-onsemi 0:098463de4c5d 1488 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->D, &src->D ) );
group-onsemi 0:098463de4c5d 1489 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->P, &src->P ) );
group-onsemi 0:098463de4c5d 1490 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->Q, &src->Q ) );
group-onsemi 0:098463de4c5d 1491 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->DP, &src->DP ) );
group-onsemi 0:098463de4c5d 1492 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->DQ, &src->DQ ) );
group-onsemi 0:098463de4c5d 1493 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->QP, &src->QP ) );
group-onsemi 0:098463de4c5d 1494
group-onsemi 0:098463de4c5d 1495 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->RN, &src->RN ) );
group-onsemi 0:098463de4c5d 1496 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->RP, &src->RP ) );
group-onsemi 0:098463de4c5d 1497 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->RQ, &src->RQ ) );
group-onsemi 0:098463de4c5d 1498
group-onsemi 0:098463de4c5d 1499 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->Vi, &src->Vi ) );
group-onsemi 0:098463de4c5d 1500 MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &dst->Vf, &src->Vf ) );
group-onsemi 0:098463de4c5d 1501
group-onsemi 0:098463de4c5d 1502 dst->padding = src->padding;
group-onsemi 0:098463de4c5d 1503 dst->hash_id = src->hash_id;
group-onsemi 0:098463de4c5d 1504
group-onsemi 0:098463de4c5d 1505 cleanup:
group-onsemi 0:098463de4c5d 1506 if( ret != 0 )
group-onsemi 0:098463de4c5d 1507 mbedtls_rsa_free( dst );
group-onsemi 0:098463de4c5d 1508
group-onsemi 0:098463de4c5d 1509 return( ret );
group-onsemi 0:098463de4c5d 1510 }
group-onsemi 0:098463de4c5d 1511
group-onsemi 0:098463de4c5d 1512 /*
group-onsemi 0:098463de4c5d 1513 * Free the components of an RSA key
group-onsemi 0:098463de4c5d 1514 */
group-onsemi 0:098463de4c5d 1515 void mbedtls_rsa_free( mbedtls_rsa_context *ctx )
group-onsemi 0:098463de4c5d 1516 {
group-onsemi 0:098463de4c5d 1517 mbedtls_mpi_free( &ctx->Vi ); mbedtls_mpi_free( &ctx->Vf );
group-onsemi 0:098463de4c5d 1518 mbedtls_mpi_free( &ctx->RQ ); mbedtls_mpi_free( &ctx->RP ); mbedtls_mpi_free( &ctx->RN );
group-onsemi 0:098463de4c5d 1519 mbedtls_mpi_free( &ctx->QP ); mbedtls_mpi_free( &ctx->DQ ); mbedtls_mpi_free( &ctx->DP );
group-onsemi 0:098463de4c5d 1520 mbedtls_mpi_free( &ctx->Q ); mbedtls_mpi_free( &ctx->P ); mbedtls_mpi_free( &ctx->D );
group-onsemi 0:098463de4c5d 1521 mbedtls_mpi_free( &ctx->E ); mbedtls_mpi_free( &ctx->N );
group-onsemi 0:098463de4c5d 1522
group-onsemi 0:098463de4c5d 1523 #if defined(MBEDTLS_THREADING_C)
group-onsemi 0:098463de4c5d 1524 mbedtls_mutex_free( &ctx->mutex );
group-onsemi 0:098463de4c5d 1525 #endif
group-onsemi 0:098463de4c5d 1526 }
group-onsemi 0:098463de4c5d 1527
group-onsemi 0:098463de4c5d 1528 #if defined(MBEDTLS_SELF_TEST)
group-onsemi 0:098463de4c5d 1529
group-onsemi 0:098463de4c5d 1530 #include "mbedtls/sha1.h"
group-onsemi 0:098463de4c5d 1531
group-onsemi 0:098463de4c5d 1532 /*
group-onsemi 0:098463de4c5d 1533 * Example RSA-1024 keypair, for test purposes
group-onsemi 0:098463de4c5d 1534 */
group-onsemi 0:098463de4c5d 1535 #define KEY_LEN 128
group-onsemi 0:098463de4c5d 1536
group-onsemi 0:098463de4c5d 1537 #define RSA_N "9292758453063D803DD603D5E777D788" \
group-onsemi 0:098463de4c5d 1538 "8ED1D5BF35786190FA2F23EBC0848AEA" \
group-onsemi 0:098463de4c5d 1539 "DDA92CA6C3D80B32C4D109BE0F36D6AE" \
group-onsemi 0:098463de4c5d 1540 "7130B9CED7ACDF54CFC7555AC14EEBAB" \
group-onsemi 0:098463de4c5d 1541 "93A89813FBF3C4F8066D2D800F7C38A8" \
group-onsemi 0:098463de4c5d 1542 "1AE31942917403FF4946B0A83D3D3E05" \
group-onsemi 0:098463de4c5d 1543 "EE57C6F5F5606FB5D4BC6CD34EE0801A" \
group-onsemi 0:098463de4c5d 1544 "5E94BB77B07507233A0BC7BAC8F90F79"
group-onsemi 0:098463de4c5d 1545
group-onsemi 0:098463de4c5d 1546 #define RSA_E "10001"
group-onsemi 0:098463de4c5d 1547
group-onsemi 0:098463de4c5d 1548 #define RSA_D "24BF6185468786FDD303083D25E64EFC" \
group-onsemi 0:098463de4c5d 1549 "66CA472BC44D253102F8B4A9D3BFA750" \
group-onsemi 0:098463de4c5d 1550 "91386C0077937FE33FA3252D28855837" \
group-onsemi 0:098463de4c5d 1551 "AE1B484A8A9A45F7EE8C0C634F99E8CD" \
group-onsemi 0:098463de4c5d 1552 "DF79C5CE07EE72C7F123142198164234" \
group-onsemi 0:098463de4c5d 1553 "CABB724CF78B8173B9F880FC86322407" \
group-onsemi 0:098463de4c5d 1554 "AF1FEDFDDE2BEB674CA15F3E81A1521E" \
group-onsemi 0:098463de4c5d 1555 "071513A1E85B5DFA031F21ECAE91A34D"
group-onsemi 0:098463de4c5d 1556
group-onsemi 0:098463de4c5d 1557 #define RSA_P "C36D0EB7FCD285223CFB5AABA5BDA3D8" \
group-onsemi 0:098463de4c5d 1558 "2C01CAD19EA484A87EA4377637E75500" \
group-onsemi 0:098463de4c5d 1559 "FCB2005C5C7DD6EC4AC023CDA285D796" \
group-onsemi 0:098463de4c5d 1560 "C3D9E75E1EFC42488BB4F1D13AC30A57"
group-onsemi 0:098463de4c5d 1561
group-onsemi 0:098463de4c5d 1562 #define RSA_Q "C000DF51A7C77AE8D7C7370C1FF55B69" \
group-onsemi 0:098463de4c5d 1563 "E211C2B9E5DB1ED0BF61D0D9899620F4" \
group-onsemi 0:098463de4c5d 1564 "910E4168387E3C30AA1E00C339A79508" \
group-onsemi 0:098463de4c5d 1565 "8452DD96A9A5EA5D9DCA68DA636032AF"
group-onsemi 0:098463de4c5d 1566
group-onsemi 0:098463de4c5d 1567 #define RSA_DP "C1ACF567564274FB07A0BBAD5D26E298" \
group-onsemi 0:098463de4c5d 1568 "3C94D22288ACD763FD8E5600ED4A702D" \
group-onsemi 0:098463de4c5d 1569 "F84198A5F06C2E72236AE490C93F07F8" \
group-onsemi 0:098463de4c5d 1570 "3CC559CD27BC2D1CA488811730BB5725"
group-onsemi 0:098463de4c5d 1571
group-onsemi 0:098463de4c5d 1572 #define RSA_DQ "4959CBF6F8FEF750AEE6977C155579C7" \
group-onsemi 0:098463de4c5d 1573 "D8AAEA56749EA28623272E4F7D0592AF" \
group-onsemi 0:098463de4c5d 1574 "7C1F1313CAC9471B5C523BFE592F517B" \
group-onsemi 0:098463de4c5d 1575 "407A1BD76C164B93DA2D32A383E58357"
group-onsemi 0:098463de4c5d 1576
group-onsemi 0:098463de4c5d 1577 #define RSA_QP "9AE7FBC99546432DF71896FC239EADAE" \
group-onsemi 0:098463de4c5d 1578 "F38D18D2B2F0E2DD275AA977E2BF4411" \
group-onsemi 0:098463de4c5d 1579 "F5A3B2A5D33605AEBBCCBA7FEB9F2D2F" \
group-onsemi 0:098463de4c5d 1580 "A74206CEC169D74BF5A8C50D6F48EA08"
group-onsemi 0:098463de4c5d 1581
group-onsemi 0:098463de4c5d 1582 #define PT_LEN 24
group-onsemi 0:098463de4c5d 1583 #define RSA_PT "\xAA\xBB\xCC\x03\x02\x01\x00\xFF\xFF\xFF\xFF\xFF" \
group-onsemi 0:098463de4c5d 1584 "\x11\x22\x33\x0A\x0B\x0C\xCC\xDD\xDD\xDD\xDD\xDD"
group-onsemi 0:098463de4c5d 1585
group-onsemi 0:098463de4c5d 1586 #if defined(MBEDTLS_PKCS1_V15)
group-onsemi 0:098463de4c5d 1587 static int myrand( void *rng_state, unsigned char *output, size_t len )
group-onsemi 0:098463de4c5d 1588 {
group-onsemi 0:098463de4c5d 1589 #if !defined(__OpenBSD__)
group-onsemi 0:098463de4c5d 1590 size_t i;
group-onsemi 0:098463de4c5d 1591
group-onsemi 0:098463de4c5d 1592 if( rng_state != NULL )
group-onsemi 0:098463de4c5d 1593 rng_state = NULL;
group-onsemi 0:098463de4c5d 1594
group-onsemi 0:098463de4c5d 1595 for( i = 0; i < len; ++i )
group-onsemi 0:098463de4c5d 1596 output[i] = rand();
group-onsemi 0:098463de4c5d 1597 #else
group-onsemi 0:098463de4c5d 1598 if( rng_state != NULL )
group-onsemi 0:098463de4c5d 1599 rng_state = NULL;
group-onsemi 0:098463de4c5d 1600
group-onsemi 0:098463de4c5d 1601 arc4random_buf( output, len );
group-onsemi 0:098463de4c5d 1602 #endif /* !OpenBSD */
group-onsemi 0:098463de4c5d 1603
group-onsemi 0:098463de4c5d 1604 return( 0 );
group-onsemi 0:098463de4c5d 1605 }
group-onsemi 0:098463de4c5d 1606 #endif /* MBEDTLS_PKCS1_V15 */
group-onsemi 0:098463de4c5d 1607
group-onsemi 0:098463de4c5d 1608 /*
group-onsemi 0:098463de4c5d 1609 * Checkup routine
group-onsemi 0:098463de4c5d 1610 */
group-onsemi 0:098463de4c5d 1611 int mbedtls_rsa_self_test( int verbose )
group-onsemi 0:098463de4c5d 1612 {
group-onsemi 0:098463de4c5d 1613 int ret = 0;
group-onsemi 0:098463de4c5d 1614 #if defined(MBEDTLS_PKCS1_V15)
group-onsemi 0:098463de4c5d 1615 size_t len;
group-onsemi 0:098463de4c5d 1616 mbedtls_rsa_context rsa;
group-onsemi 0:098463de4c5d 1617 unsigned char rsa_plaintext[PT_LEN];
group-onsemi 0:098463de4c5d 1618 unsigned char rsa_decrypted[PT_LEN];
group-onsemi 0:098463de4c5d 1619 unsigned char rsa_ciphertext[KEY_LEN];
group-onsemi 0:098463de4c5d 1620 #if defined(MBEDTLS_SHA1_C)
group-onsemi 0:098463de4c5d 1621 unsigned char sha1sum[20];
group-onsemi 0:098463de4c5d 1622 #endif
group-onsemi 0:098463de4c5d 1623
group-onsemi 0:098463de4c5d 1624 mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
group-onsemi 0:098463de4c5d 1625
group-onsemi 0:098463de4c5d 1626 rsa.len = KEY_LEN;
group-onsemi 0:098463de4c5d 1627 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.N , 16, RSA_N ) );
group-onsemi 0:098463de4c5d 1628 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.E , 16, RSA_E ) );
group-onsemi 0:098463de4c5d 1629 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.D , 16, RSA_D ) );
group-onsemi 0:098463de4c5d 1630 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.P , 16, RSA_P ) );
group-onsemi 0:098463de4c5d 1631 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.Q , 16, RSA_Q ) );
group-onsemi 0:098463de4c5d 1632 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.DP, 16, RSA_DP ) );
group-onsemi 0:098463de4c5d 1633 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.DQ, 16, RSA_DQ ) );
group-onsemi 0:098463de4c5d 1634 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &rsa.QP, 16, RSA_QP ) );
group-onsemi 0:098463de4c5d 1635
group-onsemi 0:098463de4c5d 1636 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1637 mbedtls_printf( " RSA key validation: " );
group-onsemi 0:098463de4c5d 1638
group-onsemi 0:098463de4c5d 1639 if( mbedtls_rsa_check_pubkey( &rsa ) != 0 ||
group-onsemi 0:098463de4c5d 1640 mbedtls_rsa_check_privkey( &rsa ) != 0 )
group-onsemi 0:098463de4c5d 1641 {
group-onsemi 0:098463de4c5d 1642 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1643 mbedtls_printf( "failed\n" );
group-onsemi 0:098463de4c5d 1644
group-onsemi 0:098463de4c5d 1645 return( 1 );
group-onsemi 0:098463de4c5d 1646 }
group-onsemi 0:098463de4c5d 1647
group-onsemi 0:098463de4c5d 1648 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1649 mbedtls_printf( "passed\n PKCS#1 encryption : " );
group-onsemi 0:098463de4c5d 1650
group-onsemi 0:098463de4c5d 1651 memcpy( rsa_plaintext, RSA_PT, PT_LEN );
group-onsemi 0:098463de4c5d 1652
group-onsemi 0:098463de4c5d 1653 if( mbedtls_rsa_pkcs1_encrypt( &rsa, myrand, NULL, MBEDTLS_RSA_PUBLIC, PT_LEN,
group-onsemi 0:098463de4c5d 1654 rsa_plaintext, rsa_ciphertext ) != 0 )
group-onsemi 0:098463de4c5d 1655 {
group-onsemi 0:098463de4c5d 1656 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1657 mbedtls_printf( "failed\n" );
group-onsemi 0:098463de4c5d 1658
group-onsemi 0:098463de4c5d 1659 return( 1 );
group-onsemi 0:098463de4c5d 1660 }
group-onsemi 0:098463de4c5d 1661
group-onsemi 0:098463de4c5d 1662 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1663 mbedtls_printf( "passed\n PKCS#1 decryption : " );
group-onsemi 0:098463de4c5d 1664
group-onsemi 0:098463de4c5d 1665 if( mbedtls_rsa_pkcs1_decrypt( &rsa, myrand, NULL, MBEDTLS_RSA_PRIVATE, &len,
group-onsemi 0:098463de4c5d 1666 rsa_ciphertext, rsa_decrypted,
group-onsemi 0:098463de4c5d 1667 sizeof(rsa_decrypted) ) != 0 )
group-onsemi 0:098463de4c5d 1668 {
group-onsemi 0:098463de4c5d 1669 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1670 mbedtls_printf( "failed\n" );
group-onsemi 0:098463de4c5d 1671
group-onsemi 0:098463de4c5d 1672 return( 1 );
group-onsemi 0:098463de4c5d 1673 }
group-onsemi 0:098463de4c5d 1674
group-onsemi 0:098463de4c5d 1675 if( memcmp( rsa_decrypted, rsa_plaintext, len ) != 0 )
group-onsemi 0:098463de4c5d 1676 {
group-onsemi 0:098463de4c5d 1677 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1678 mbedtls_printf( "failed\n" );
group-onsemi 0:098463de4c5d 1679
group-onsemi 0:098463de4c5d 1680 return( 1 );
group-onsemi 0:098463de4c5d 1681 }
group-onsemi 0:098463de4c5d 1682
group-onsemi 0:098463de4c5d 1683 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1684 mbedtls_printf( "passed\n" );
group-onsemi 0:098463de4c5d 1685
group-onsemi 0:098463de4c5d 1686 #if defined(MBEDTLS_SHA1_C)
group-onsemi 0:098463de4c5d 1687 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1688 mbedtls_printf( " PKCS#1 data sign : " );
group-onsemi 0:098463de4c5d 1689
group-onsemi 0:098463de4c5d 1690 mbedtls_sha1( rsa_plaintext, PT_LEN, sha1sum );
group-onsemi 0:098463de4c5d 1691
group-onsemi 0:098463de4c5d 1692 if( mbedtls_rsa_pkcs1_sign( &rsa, myrand, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA1, 0,
group-onsemi 0:098463de4c5d 1693 sha1sum, rsa_ciphertext ) != 0 )
group-onsemi 0:098463de4c5d 1694 {
group-onsemi 0:098463de4c5d 1695 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1696 mbedtls_printf( "failed\n" );
group-onsemi 0:098463de4c5d 1697
group-onsemi 0:098463de4c5d 1698 return( 1 );
group-onsemi 0:098463de4c5d 1699 }
group-onsemi 0:098463de4c5d 1700
group-onsemi 0:098463de4c5d 1701 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1702 mbedtls_printf( "passed\n PKCS#1 sig. verify: " );
group-onsemi 0:098463de4c5d 1703
group-onsemi 0:098463de4c5d 1704 if( mbedtls_rsa_pkcs1_verify( &rsa, NULL, NULL, MBEDTLS_RSA_PUBLIC, MBEDTLS_MD_SHA1, 0,
group-onsemi 0:098463de4c5d 1705 sha1sum, rsa_ciphertext ) != 0 )
group-onsemi 0:098463de4c5d 1706 {
group-onsemi 0:098463de4c5d 1707 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1708 mbedtls_printf( "failed\n" );
group-onsemi 0:098463de4c5d 1709
group-onsemi 0:098463de4c5d 1710 return( 1 );
group-onsemi 0:098463de4c5d 1711 }
group-onsemi 0:098463de4c5d 1712
group-onsemi 0:098463de4c5d 1713 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1714 mbedtls_printf( "passed\n" );
group-onsemi 0:098463de4c5d 1715 #endif /* MBEDTLS_SHA1_C */
group-onsemi 0:098463de4c5d 1716
group-onsemi 0:098463de4c5d 1717 if( verbose != 0 )
group-onsemi 0:098463de4c5d 1718 mbedtls_printf( "\n" );
group-onsemi 0:098463de4c5d 1719
group-onsemi 0:098463de4c5d 1720 cleanup:
group-onsemi 0:098463de4c5d 1721 mbedtls_rsa_free( &rsa );
group-onsemi 0:098463de4c5d 1722 #else /* MBEDTLS_PKCS1_V15 */
group-onsemi 0:098463de4c5d 1723 ((void) verbose);
group-onsemi 0:098463de4c5d 1724 #endif /* MBEDTLS_PKCS1_V15 */
group-onsemi 0:098463de4c5d 1725 return( ret );
group-onsemi 0:098463de4c5d 1726 }
group-onsemi 0:098463de4c5d 1727
group-onsemi 0:098463de4c5d 1728 #endif /* MBEDTLS_SELF_TEST */
group-onsemi 0:098463de4c5d 1729
group-onsemi 0:098463de4c5d 1730 #endif /* MBEDTLS_RSA_C */