Austin Blackstone / Mbed 2 deprecated mbed-client-classic-example-lwip

mbed client on ethernet with LWIP

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by sandbox

mbedtls/source/hmac_drbg.c@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

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mbedAustin 11:cada08fc8a70 1 /*
mbedAustin 11:cada08fc8a70 2 * HMAC_DRBG implementation (NIST SP 800-90)
mbedAustin 11:cada08fc8a70 3 *
mbedAustin 11:cada08fc8a70 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
mbedAustin 11:cada08fc8a70 5 * SPDX-License-Identifier: Apache-2.0
mbedAustin 11:cada08fc8a70 6 *
mbedAustin 11:cada08fc8a70 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
mbedAustin 11:cada08fc8a70 8 * not use this file except in compliance with the License.
mbedAustin 11:cada08fc8a70 9 * You may obtain a copy of the License at
mbedAustin 11:cada08fc8a70 10 *
mbedAustin 11:cada08fc8a70 11 * http://www.apache.org/licenses/LICENSE-2.0
mbedAustin 11:cada08fc8a70 12 *
mbedAustin 11:cada08fc8a70 13 * Unless required by applicable law or agreed to in writing, software
mbedAustin 11:cada08fc8a70 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
mbedAustin 11:cada08fc8a70 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbedAustin 11:cada08fc8a70 16 * See the License for the specific language governing permissions and
mbedAustin 11:cada08fc8a70 17 * limitations under the License.
mbedAustin 11:cada08fc8a70 18 *
mbedAustin 11:cada08fc8a70 19 * This file is part of mbed TLS (https://tls.mbed.org)
mbedAustin 11:cada08fc8a70 20 */
mbedAustin 11:cada08fc8a70 21
mbedAustin 11:cada08fc8a70 22 /*
mbedAustin 11:cada08fc8a70 23 * The NIST SP 800-90A DRBGs are described in the following publication.
mbedAustin 11:cada08fc8a70 24 * http://csrc.nist.gov/publications/nistpubs/800-90A/SP800-90A.pdf
mbedAustin 11:cada08fc8a70 25 * References below are based on rev. 1 (January 2012).
mbedAustin 11:cada08fc8a70 26 */
mbedAustin 11:cada08fc8a70 27
mbedAustin 11:cada08fc8a70 28 #if !defined(MBEDTLS_CONFIG_FILE)
mbedAustin 11:cada08fc8a70 29 #include "mbedtls/config.h"
mbedAustin 11:cada08fc8a70 30 #else
mbedAustin 11:cada08fc8a70 31 #include MBEDTLS_CONFIG_FILE
mbedAustin 11:cada08fc8a70 32 #endif
mbedAustin 11:cada08fc8a70 33
mbedAustin 11:cada08fc8a70 34 #if defined(MBEDTLS_HMAC_DRBG_C)
mbedAustin 11:cada08fc8a70 35
mbedAustin 11:cada08fc8a70 36 #include "mbedtls/hmac_drbg.h"
mbedAustin 11:cada08fc8a70 37
mbedAustin 11:cada08fc8a70 38 #include <string.h>
mbedAustin 11:cada08fc8a70 39
mbedAustin 11:cada08fc8a70 40 #if defined(MBEDTLS_FS_IO)
mbedAustin 11:cada08fc8a70 41 #include <stdio.h>
mbedAustin 11:cada08fc8a70 42 #endif
mbedAustin 11:cada08fc8a70 43
mbedAustin 11:cada08fc8a70 44 #if defined(MBEDTLS_SELF_TEST)
mbedAustin 11:cada08fc8a70 45 #if defined(MBEDTLS_PLATFORM_C)
mbedAustin 11:cada08fc8a70 46 #include "mbedtls/platform.h"
mbedAustin 11:cada08fc8a70 47 #else
mbedAustin 11:cada08fc8a70 48 #include <stdio.h>
mbedAustin 11:cada08fc8a70 49 #define mbedtls_printf printf
mbedAustin 11:cada08fc8a70 50 #endif /* MBEDTLS_SELF_TEST */
mbedAustin 11:cada08fc8a70 51 #endif /* MBEDTLS_PLATFORM_C */
mbedAustin 11:cada08fc8a70 52
mbedAustin 11:cada08fc8a70 53 /* Implementation that should never be optimized out by the compiler */
mbedAustin 11:cada08fc8a70 54 static void mbedtls_zeroize( void *v, size_t n ) {
mbedAustin 11:cada08fc8a70 55 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
mbedAustin 11:cada08fc8a70 56 }
mbedAustin 11:cada08fc8a70 57
mbedAustin 11:cada08fc8a70 58 /*
mbedAustin 11:cada08fc8a70 59 * HMAC_DRBG context initialization
mbedAustin 11:cada08fc8a70 60 */
mbedAustin 11:cada08fc8a70 61 void mbedtls_hmac_drbg_init( mbedtls_hmac_drbg_context *ctx )
mbedAustin 11:cada08fc8a70 62 {
mbedAustin 11:cada08fc8a70 63 memset( ctx, 0, sizeof( mbedtls_hmac_drbg_context ) );
mbedAustin 11:cada08fc8a70 64
mbedAustin 11:cada08fc8a70 65 #if defined(MBEDTLS_THREADING_C)
mbedAustin 11:cada08fc8a70 66 mbedtls_mutex_init( &ctx->mutex );
mbedAustin 11:cada08fc8a70 67 #endif
mbedAustin 11:cada08fc8a70 68 }
mbedAustin 11:cada08fc8a70 69
mbedAustin 11:cada08fc8a70 70 /*
mbedAustin 11:cada08fc8a70 71 * HMAC_DRBG update, using optional additional data (10.1.2.2)
mbedAustin 11:cada08fc8a70 72 */
mbedAustin 11:cada08fc8a70 73 void mbedtls_hmac_drbg_update( mbedtls_hmac_drbg_context *ctx,
mbedAustin 11:cada08fc8a70 74 const unsigned char *additional, size_t add_len )
mbedAustin 11:cada08fc8a70 75 {
mbedAustin 11:cada08fc8a70 76 size_t md_len = mbedtls_md_get_size( ctx->md_ctx.md_info );
mbedAustin 11:cada08fc8a70 77 unsigned char rounds = ( additional != NULL && add_len != 0 ) ? 2 : 1;
mbedAustin 11:cada08fc8a70 78 unsigned char sep[1];
mbedAustin 11:cada08fc8a70 79 unsigned char K[MBEDTLS_MD_MAX_SIZE];
mbedAustin 11:cada08fc8a70 80
mbedAustin 11:cada08fc8a70 81 for( sep[0] = 0; sep[0] < rounds; sep[0]++ )
mbedAustin 11:cada08fc8a70 82 {
mbedAustin 11:cada08fc8a70 83 /* Step 1 or 4 */
mbedAustin 11:cada08fc8a70 84 mbedtls_md_hmac_reset( &ctx->md_ctx );
mbedAustin 11:cada08fc8a70 85 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
mbedAustin 11:cada08fc8a70 86 mbedtls_md_hmac_update( &ctx->md_ctx, sep, 1 );
mbedAustin 11:cada08fc8a70 87 if( rounds == 2 )
mbedAustin 11:cada08fc8a70 88 mbedtls_md_hmac_update( &ctx->md_ctx, additional, add_len );
mbedAustin 11:cada08fc8a70 89 mbedtls_md_hmac_finish( &ctx->md_ctx, K );
mbedAustin 11:cada08fc8a70 90
mbedAustin 11:cada08fc8a70 91 /* Step 2 or 5 */
mbedAustin 11:cada08fc8a70 92 mbedtls_md_hmac_starts( &ctx->md_ctx, K, md_len );
mbedAustin 11:cada08fc8a70 93 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
mbedAustin 11:cada08fc8a70 94 mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V );
mbedAustin 11:cada08fc8a70 95 }
mbedAustin 11:cada08fc8a70 96 }
mbedAustin 11:cada08fc8a70 97
mbedAustin 11:cada08fc8a70 98 /*
mbedAustin 11:cada08fc8a70 99 * Simplified HMAC_DRBG initialisation (for use with deterministic ECDSA)
mbedAustin 11:cada08fc8a70 100 */
mbedAustin 11:cada08fc8a70 101 int mbedtls_hmac_drbg_seed_buf( mbedtls_hmac_drbg_context *ctx,
mbedAustin 11:cada08fc8a70 102 const mbedtls_md_info_t * md_info,
mbedAustin 11:cada08fc8a70 103 const unsigned char *data, size_t data_len )
mbedAustin 11:cada08fc8a70 104 {
mbedAustin 11:cada08fc8a70 105 int ret;
mbedAustin 11:cada08fc8a70 106
mbedAustin 11:cada08fc8a70 107 if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
mbedAustin 11:cada08fc8a70 108 return( ret );
mbedAustin 11:cada08fc8a70 109
mbedAustin 11:cada08fc8a70 110 /*
mbedAustin 11:cada08fc8a70 111 * Set initial working state.
mbedAustin 11:cada08fc8a70 112 * Use the V memory location, which is currently all 0, to initialize the
mbedAustin 11:cada08fc8a70 113 * MD context with an all-zero key. Then set V to its initial value.
mbedAustin 11:cada08fc8a70 114 */
mbedAustin 11:cada08fc8a70 115 mbedtls_md_hmac_starts( &ctx->md_ctx, ctx->V, mbedtls_md_get_size( md_info ) );
mbedAustin 11:cada08fc8a70 116 memset( ctx->V, 0x01, mbedtls_md_get_size( md_info ) );
mbedAustin 11:cada08fc8a70 117
mbedAustin 11:cada08fc8a70 118 mbedtls_hmac_drbg_update( ctx, data, data_len );
mbedAustin 11:cada08fc8a70 119
mbedAustin 11:cada08fc8a70 120 return( 0 );
mbedAustin 11:cada08fc8a70 121 }
mbedAustin 11:cada08fc8a70 122
mbedAustin 11:cada08fc8a70 123 /*
mbedAustin 11:cada08fc8a70 124 * HMAC_DRBG reseeding: 10.1.2.4 (arabic) + 9.2 (Roman)
mbedAustin 11:cada08fc8a70 125 */
mbedAustin 11:cada08fc8a70 126 int mbedtls_hmac_drbg_reseed( mbedtls_hmac_drbg_context *ctx,
mbedAustin 11:cada08fc8a70 127 const unsigned char *additional, size_t len )
mbedAustin 11:cada08fc8a70 128 {
mbedAustin 11:cada08fc8a70 129 unsigned char seed[MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT];
mbedAustin 11:cada08fc8a70 130 size_t seedlen;
mbedAustin 11:cada08fc8a70 131
mbedAustin 11:cada08fc8a70 132 /* III. Check input length */
mbedAustin 11:cada08fc8a70 133 if( len > MBEDTLS_HMAC_DRBG_MAX_INPUT ||
mbedAustin 11:cada08fc8a70 134 ctx->entropy_len + len > MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT )
mbedAustin 11:cada08fc8a70 135 {
mbedAustin 11:cada08fc8a70 136 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
mbedAustin 11:cada08fc8a70 137 }
mbedAustin 11:cada08fc8a70 138
mbedAustin 11:cada08fc8a70 139 memset( seed, 0, MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT );
mbedAustin 11:cada08fc8a70 140
mbedAustin 11:cada08fc8a70 141 /* IV. Gather entropy_len bytes of entropy for the seed */
mbedAustin 11:cada08fc8a70 142 if( ctx->f_entropy( ctx->p_entropy, seed, ctx->entropy_len ) != 0 )
mbedAustin 11:cada08fc8a70 143 return( MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED );
mbedAustin 11:cada08fc8a70 144
mbedAustin 11:cada08fc8a70 145 seedlen = ctx->entropy_len;
mbedAustin 11:cada08fc8a70 146
mbedAustin 11:cada08fc8a70 147 /* 1. Concatenate entropy and additional data if any */
mbedAustin 11:cada08fc8a70 148 if( additional != NULL && len != 0 )
mbedAustin 11:cada08fc8a70 149 {
mbedAustin 11:cada08fc8a70 150 memcpy( seed + seedlen, additional, len );
mbedAustin 11:cada08fc8a70 151 seedlen += len;
mbedAustin 11:cada08fc8a70 152 }
mbedAustin 11:cada08fc8a70 153
mbedAustin 11:cada08fc8a70 154 /* 2. Update state */
mbedAustin 11:cada08fc8a70 155 mbedtls_hmac_drbg_update( ctx, seed, seedlen );
mbedAustin 11:cada08fc8a70 156
mbedAustin 11:cada08fc8a70 157 /* 3. Reset reseed_counter */
mbedAustin 11:cada08fc8a70 158 ctx->reseed_counter = 1;
mbedAustin 11:cada08fc8a70 159
mbedAustin 11:cada08fc8a70 160 /* 4. Done */
mbedAustin 11:cada08fc8a70 161 return( 0 );
mbedAustin 11:cada08fc8a70 162 }
mbedAustin 11:cada08fc8a70 163
mbedAustin 11:cada08fc8a70 164 /*
mbedAustin 11:cada08fc8a70 165 * HMAC_DRBG initialisation (10.1.2.3 + 9.1)
mbedAustin 11:cada08fc8a70 166 */
mbedAustin 11:cada08fc8a70 167 int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
mbedAustin 11:cada08fc8a70 168 const mbedtls_md_info_t * md_info,
mbedAustin 11:cada08fc8a70 169 int (*f_entropy)(void *, unsigned char *, size_t),
mbedAustin 11:cada08fc8a70 170 void *p_entropy,
mbedAustin 11:cada08fc8a70 171 const unsigned char *custom,
mbedAustin 11:cada08fc8a70 172 size_t len )
mbedAustin 11:cada08fc8a70 173 {
mbedAustin 11:cada08fc8a70 174 int ret;
mbedAustin 11:cada08fc8a70 175 size_t entropy_len, md_size;
mbedAustin 11:cada08fc8a70 176
mbedAustin 11:cada08fc8a70 177 if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
mbedAustin 11:cada08fc8a70 178 return( ret );
mbedAustin 11:cada08fc8a70 179
mbedAustin 11:cada08fc8a70 180 md_size = mbedtls_md_get_size( md_info );
mbedAustin 11:cada08fc8a70 181
mbedAustin 11:cada08fc8a70 182 /*
mbedAustin 11:cada08fc8a70 183 * Set initial working state.
mbedAustin 11:cada08fc8a70 184 * Use the V memory location, which is currently all 0, to initialize the
mbedAustin 11:cada08fc8a70 185 * MD context with an all-zero key. Then set V to its initial value.
mbedAustin 11:cada08fc8a70 186 */
mbedAustin 11:cada08fc8a70 187 mbedtls_md_hmac_starts( &ctx->md_ctx, ctx->V, md_size );
mbedAustin 11:cada08fc8a70 188 memset( ctx->V, 0x01, md_size );
mbedAustin 11:cada08fc8a70 189
mbedAustin 11:cada08fc8a70 190 ctx->f_entropy = f_entropy;
mbedAustin 11:cada08fc8a70 191 ctx->p_entropy = p_entropy;
mbedAustin 11:cada08fc8a70 192
mbedAustin 11:cada08fc8a70 193 ctx->reseed_interval = MBEDTLS_HMAC_DRBG_RESEED_INTERVAL;
mbedAustin 11:cada08fc8a70 194
mbedAustin 11:cada08fc8a70 195 /*
mbedAustin 11:cada08fc8a70 196 * See SP800-57 5.6.1 (p. 65-66) for the security strength provided by
mbedAustin 11:cada08fc8a70 197 * each hash function, then according to SP800-90A rev1 10.1 table 2,
mbedAustin 11:cada08fc8a70 198 * min_entropy_len (in bits) is security_strength.
mbedAustin 11:cada08fc8a70 199 *
mbedAustin 11:cada08fc8a70 200 * (This also matches the sizes used in the NIST test vectors.)
mbedAustin 11:cada08fc8a70 201 */
mbedAustin 11:cada08fc8a70 202 entropy_len = md_size <= 20 ? 16 : /* 160-bits hash -> 128 bits */
mbedAustin 11:cada08fc8a70 203 md_size <= 28 ? 24 : /* 224-bits hash -> 192 bits */
mbedAustin 11:cada08fc8a70 204 32; /* better (256+) -> 256 bits */
mbedAustin 11:cada08fc8a70 205
mbedAustin 11:cada08fc8a70 206 /*
mbedAustin 11:cada08fc8a70 207 * For initialisation, use more entropy to emulate a nonce
mbedAustin 11:cada08fc8a70 208 * (Again, matches test vectors.)
mbedAustin 11:cada08fc8a70 209 */
mbedAustin 11:cada08fc8a70 210 ctx->entropy_len = entropy_len * 3 / 2;
mbedAustin 11:cada08fc8a70 211
mbedAustin 11:cada08fc8a70 212 if( ( ret = mbedtls_hmac_drbg_reseed( ctx, custom, len ) ) != 0 )
mbedAustin 11:cada08fc8a70 213 return( ret );
mbedAustin 11:cada08fc8a70 214
mbedAustin 11:cada08fc8a70 215 ctx->entropy_len = entropy_len;
mbedAustin 11:cada08fc8a70 216
mbedAustin 11:cada08fc8a70 217 return( 0 );
mbedAustin 11:cada08fc8a70 218 }
mbedAustin 11:cada08fc8a70 219
mbedAustin 11:cada08fc8a70 220 /*
mbedAustin 11:cada08fc8a70 221 * Set prediction resistance
mbedAustin 11:cada08fc8a70 222 */
mbedAustin 11:cada08fc8a70 223 void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx,
mbedAustin 11:cada08fc8a70 224 int resistance )
mbedAustin 11:cada08fc8a70 225 {
mbedAustin 11:cada08fc8a70 226 ctx->prediction_resistance = resistance;
mbedAustin 11:cada08fc8a70 227 }
mbedAustin 11:cada08fc8a70 228
mbedAustin 11:cada08fc8a70 229 /*
mbedAustin 11:cada08fc8a70 230 * Set entropy length grabbed for reseeds
mbedAustin 11:cada08fc8a70 231 */
mbedAustin 11:cada08fc8a70 232 void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx, size_t len )
mbedAustin 11:cada08fc8a70 233 {
mbedAustin 11:cada08fc8a70 234 ctx->entropy_len = len;
mbedAustin 11:cada08fc8a70 235 }
mbedAustin 11:cada08fc8a70 236
mbedAustin 11:cada08fc8a70 237 /*
mbedAustin 11:cada08fc8a70 238 * Set reseed interval
mbedAustin 11:cada08fc8a70 239 */
mbedAustin 11:cada08fc8a70 240 void mbedtls_hmac_drbg_set_reseed_interval( mbedtls_hmac_drbg_context *ctx, int interval )
mbedAustin 11:cada08fc8a70 241 {
mbedAustin 11:cada08fc8a70 242 ctx->reseed_interval = interval;
mbedAustin 11:cada08fc8a70 243 }
mbedAustin 11:cada08fc8a70 244
mbedAustin 11:cada08fc8a70 245 /*
mbedAustin 11:cada08fc8a70 246 * HMAC_DRBG random function with optional additional data:
mbedAustin 11:cada08fc8a70 247 * 10.1.2.5 (arabic) + 9.3 (Roman)
mbedAustin 11:cada08fc8a70 248 */
mbedAustin 11:cada08fc8a70 249 int mbedtls_hmac_drbg_random_with_add( void *p_rng,
mbedAustin 11:cada08fc8a70 250 unsigned char *output, size_t out_len,
mbedAustin 11:cada08fc8a70 251 const unsigned char *additional, size_t add_len )
mbedAustin 11:cada08fc8a70 252 {
mbedAustin 11:cada08fc8a70 253 int ret;
mbedAustin 11:cada08fc8a70 254 mbedtls_hmac_drbg_context *ctx = (mbedtls_hmac_drbg_context *) p_rng;
mbedAustin 11:cada08fc8a70 255 size_t md_len = mbedtls_md_get_size( ctx->md_ctx.md_info );
mbedAustin 11:cada08fc8a70 256 size_t left = out_len;
mbedAustin 11:cada08fc8a70 257 unsigned char *out = output;
mbedAustin 11:cada08fc8a70 258
mbedAustin 11:cada08fc8a70 259 /* II. Check request length */
mbedAustin 11:cada08fc8a70 260 if( out_len > MBEDTLS_HMAC_DRBG_MAX_REQUEST )
mbedAustin 11:cada08fc8a70 261 return( MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG );
mbedAustin 11:cada08fc8a70 262
mbedAustin 11:cada08fc8a70 263 /* III. Check input length */
mbedAustin 11:cada08fc8a70 264 if( add_len > MBEDTLS_HMAC_DRBG_MAX_INPUT )
mbedAustin 11:cada08fc8a70 265 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
mbedAustin 11:cada08fc8a70 266
mbedAustin 11:cada08fc8a70 267 /* 1. (aka VII and IX) Check reseed counter and PR */
mbedAustin 11:cada08fc8a70 268 if( ctx->f_entropy != NULL && /* For no-reseeding instances */
mbedAustin 11:cada08fc8a70 269 ( ctx->prediction_resistance == MBEDTLS_HMAC_DRBG_PR_ON ||
mbedAustin 11:cada08fc8a70 270 ctx->reseed_counter > ctx->reseed_interval ) )
mbedAustin 11:cada08fc8a70 271 {
mbedAustin 11:cada08fc8a70 272 if( ( ret = mbedtls_hmac_drbg_reseed( ctx, additional, add_len ) ) != 0 )
mbedAustin 11:cada08fc8a70 273 return( ret );
mbedAustin 11:cada08fc8a70 274
mbedAustin 11:cada08fc8a70 275 add_len = 0; /* VII.4 */
mbedAustin 11:cada08fc8a70 276 }
mbedAustin 11:cada08fc8a70 277
mbedAustin 11:cada08fc8a70 278 /* 2. Use additional data if any */
mbedAustin 11:cada08fc8a70 279 if( additional != NULL && add_len != 0 )
mbedAustin 11:cada08fc8a70 280 mbedtls_hmac_drbg_update( ctx, additional, add_len );
mbedAustin 11:cada08fc8a70 281
mbedAustin 11:cada08fc8a70 282 /* 3, 4, 5. Generate bytes */
mbedAustin 11:cada08fc8a70 283 while( left != 0 )
mbedAustin 11:cada08fc8a70 284 {
mbedAustin 11:cada08fc8a70 285 size_t use_len = left > md_len ? md_len : left;
mbedAustin 11:cada08fc8a70 286
mbedAustin 11:cada08fc8a70 287 mbedtls_md_hmac_reset( &ctx->md_ctx );
mbedAustin 11:cada08fc8a70 288 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
mbedAustin 11:cada08fc8a70 289 mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V );
mbedAustin 11:cada08fc8a70 290
mbedAustin 11:cada08fc8a70 291 memcpy( out, ctx->V, use_len );
mbedAustin 11:cada08fc8a70 292 out += use_len;
mbedAustin 11:cada08fc8a70 293 left -= use_len;
mbedAustin 11:cada08fc8a70 294 }
mbedAustin 11:cada08fc8a70 295
mbedAustin 11:cada08fc8a70 296 /* 6. Update */
mbedAustin 11:cada08fc8a70 297 mbedtls_hmac_drbg_update( ctx, additional, add_len );
mbedAustin 11:cada08fc8a70 298
mbedAustin 11:cada08fc8a70 299 /* 7. Update reseed counter */
mbedAustin 11:cada08fc8a70 300 ctx->reseed_counter++;
mbedAustin 11:cada08fc8a70 301
mbedAustin 11:cada08fc8a70 302 /* 8. Done */
mbedAustin 11:cada08fc8a70 303 return( 0 );
mbedAustin 11:cada08fc8a70 304 }
mbedAustin 11:cada08fc8a70 305
mbedAustin 11:cada08fc8a70 306 /*
mbedAustin 11:cada08fc8a70 307 * HMAC_DRBG random function
mbedAustin 11:cada08fc8a70 308 */
mbedAustin 11:cada08fc8a70 309 int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len )
mbedAustin 11:cada08fc8a70 310 {
mbedAustin 11:cada08fc8a70 311 int ret;
mbedAustin 11:cada08fc8a70 312 mbedtls_hmac_drbg_context *ctx = (mbedtls_hmac_drbg_context *) p_rng;
mbedAustin 11:cada08fc8a70 313
mbedAustin 11:cada08fc8a70 314 #if defined(MBEDTLS_THREADING_C)
mbedAustin 11:cada08fc8a70 315 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
mbedAustin 11:cada08fc8a70 316 return( ret );
mbedAustin 11:cada08fc8a70 317 #endif
mbedAustin 11:cada08fc8a70 318
mbedAustin 11:cada08fc8a70 319 ret = mbedtls_hmac_drbg_random_with_add( ctx, output, out_len, NULL, 0 );
mbedAustin 11:cada08fc8a70 320
mbedAustin 11:cada08fc8a70 321 #if defined(MBEDTLS_THREADING_C)
mbedAustin 11:cada08fc8a70 322 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
mbedAustin 11:cada08fc8a70 323 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
mbedAustin 11:cada08fc8a70 324 #endif
mbedAustin 11:cada08fc8a70 325
mbedAustin 11:cada08fc8a70 326 return( ret );
mbedAustin 11:cada08fc8a70 327 }
mbedAustin 11:cada08fc8a70 328
mbedAustin 11:cada08fc8a70 329 /*
mbedAustin 11:cada08fc8a70 330 * Free an HMAC_DRBG context
mbedAustin 11:cada08fc8a70 331 */
mbedAustin 11:cada08fc8a70 332 void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx )
mbedAustin 11:cada08fc8a70 333 {
mbedAustin 11:cada08fc8a70 334 if( ctx == NULL )
mbedAustin 11:cada08fc8a70 335 return;
mbedAustin 11:cada08fc8a70 336
mbedAustin 11:cada08fc8a70 337 #if defined(MBEDTLS_THREADING_C)
mbedAustin 11:cada08fc8a70 338 mbedtls_mutex_free( &ctx->mutex );
mbedAustin 11:cada08fc8a70 339 #endif
mbedAustin 11:cada08fc8a70 340 mbedtls_md_free( &ctx->md_ctx );
mbedAustin 11:cada08fc8a70 341 mbedtls_zeroize( ctx, sizeof( mbedtls_hmac_drbg_context ) );
mbedAustin 11:cada08fc8a70 342 }
mbedAustin 11:cada08fc8a70 343
mbedAustin 11:cada08fc8a70 344 #if defined(MBEDTLS_FS_IO)
mbedAustin 11:cada08fc8a70 345 int mbedtls_hmac_drbg_write_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
mbedAustin 11:cada08fc8a70 346 {
mbedAustin 11:cada08fc8a70 347 int ret;
mbedAustin 11:cada08fc8a70 348 FILE *f;
mbedAustin 11:cada08fc8a70 349 unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
mbedAustin 11:cada08fc8a70 350
mbedAustin 11:cada08fc8a70 351 if( ( f = fopen( path, "wb" ) ) == NULL )
mbedAustin 11:cada08fc8a70 352 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
mbedAustin 11:cada08fc8a70 353
mbedAustin 11:cada08fc8a70 354 if( ( ret = mbedtls_hmac_drbg_random( ctx, buf, sizeof( buf ) ) ) != 0 )
mbedAustin 11:cada08fc8a70 355 goto exit;
mbedAustin 11:cada08fc8a70 356
mbedAustin 11:cada08fc8a70 357 if( fwrite( buf, 1, sizeof( buf ), f ) != sizeof( buf ) )
mbedAustin 11:cada08fc8a70 358 {
mbedAustin 11:cada08fc8a70 359 ret = MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR;
mbedAustin 11:cada08fc8a70 360 goto exit;
mbedAustin 11:cada08fc8a70 361 }
mbedAustin 11:cada08fc8a70 362
mbedAustin 11:cada08fc8a70 363 ret = 0;
mbedAustin 11:cada08fc8a70 364
mbedAustin 11:cada08fc8a70 365 exit:
mbedAustin 11:cada08fc8a70 366 fclose( f );
mbedAustin 11:cada08fc8a70 367 return( ret );
mbedAustin 11:cada08fc8a70 368 }
mbedAustin 11:cada08fc8a70 369
mbedAustin 11:cada08fc8a70 370 int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
mbedAustin 11:cada08fc8a70 371 {
mbedAustin 11:cada08fc8a70 372 FILE *f;
mbedAustin 11:cada08fc8a70 373 size_t n;
mbedAustin 11:cada08fc8a70 374 unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
mbedAustin 11:cada08fc8a70 375
mbedAustin 11:cada08fc8a70 376 if( ( f = fopen( path, "rb" ) ) == NULL )
mbedAustin 11:cada08fc8a70 377 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
mbedAustin 11:cada08fc8a70 378
mbedAustin 11:cada08fc8a70 379 fseek( f, 0, SEEK_END );
mbedAustin 11:cada08fc8a70 380 n = (size_t) ftell( f );
mbedAustin 11:cada08fc8a70 381 fseek( f, 0, SEEK_SET );
mbedAustin 11:cada08fc8a70 382
mbedAustin 11:cada08fc8a70 383 if( n > MBEDTLS_HMAC_DRBG_MAX_INPUT )
mbedAustin 11:cada08fc8a70 384 {
mbedAustin 11:cada08fc8a70 385 fclose( f );
mbedAustin 11:cada08fc8a70 386 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
mbedAustin 11:cada08fc8a70 387 }
mbedAustin 11:cada08fc8a70 388
mbedAustin 11:cada08fc8a70 389 if( fread( buf, 1, n, f ) != n )
mbedAustin 11:cada08fc8a70 390 {
mbedAustin 11:cada08fc8a70 391 fclose( f );
mbedAustin 11:cada08fc8a70 392 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
mbedAustin 11:cada08fc8a70 393 }
mbedAustin 11:cada08fc8a70 394
mbedAustin 11:cada08fc8a70 395 fclose( f );
mbedAustin 11:cada08fc8a70 396
mbedAustin 11:cada08fc8a70 397 mbedtls_hmac_drbg_update( ctx, buf, n );
mbedAustin 11:cada08fc8a70 398
mbedAustin 11:cada08fc8a70 399 return( mbedtls_hmac_drbg_write_seed_file( ctx, path ) );
mbedAustin 11:cada08fc8a70 400 }
mbedAustin 11:cada08fc8a70 401 #endif /* MBEDTLS_FS_IO */
mbedAustin 11:cada08fc8a70 402
mbedAustin 11:cada08fc8a70 403
mbedAustin 11:cada08fc8a70 404 #if defined(MBEDTLS_SELF_TEST)
mbedAustin 11:cada08fc8a70 405
mbedAustin 11:cada08fc8a70 406 #if !defined(MBEDTLS_SHA1_C)
mbedAustin 11:cada08fc8a70 407 /* Dummy checkup routine */
mbedAustin 11:cada08fc8a70 408 int mbedtls_hmac_drbg_self_test( int verbose )
mbedAustin 11:cada08fc8a70 409 {
mbedAustin 11:cada08fc8a70 410 (void) verbose;
mbedAustin 11:cada08fc8a70 411 return( 0 );
mbedAustin 11:cada08fc8a70 412 }
mbedAustin 11:cada08fc8a70 413 #else
mbedAustin 11:cada08fc8a70 414
mbedAustin 11:cada08fc8a70 415 #define OUTPUT_LEN 80
mbedAustin 11:cada08fc8a70 416
mbedAustin 11:cada08fc8a70 417 /* From a NIST PR=true test vector */
mbedAustin 11:cada08fc8a70 418 static const unsigned char entropy_pr[] = {
mbedAustin 11:cada08fc8a70 419 0xa0, 0xc9, 0xab, 0x58, 0xf1, 0xe2, 0xe5, 0xa4, 0xde, 0x3e, 0xbd, 0x4f,
mbedAustin 11:cada08fc8a70 420 0xf7, 0x3e, 0x9c, 0x5b, 0x64, 0xef, 0xd8, 0xca, 0x02, 0x8c, 0xf8, 0x11,
mbedAustin 11:cada08fc8a70 421 0x48, 0xa5, 0x84, 0xfe, 0x69, 0xab, 0x5a, 0xee, 0x42, 0xaa, 0x4d, 0x42,
mbedAustin 11:cada08fc8a70 422 0x17, 0x60, 0x99, 0xd4, 0x5e, 0x13, 0x97, 0xdc, 0x40, 0x4d, 0x86, 0xa3,
mbedAustin 11:cada08fc8a70 423 0x7b, 0xf5, 0x59, 0x54, 0x75, 0x69, 0x51, 0xe4 };
mbedAustin 11:cada08fc8a70 424 static const unsigned char result_pr[OUTPUT_LEN] = {
mbedAustin 11:cada08fc8a70 425 0x9a, 0x00, 0xa2, 0xd0, 0x0e, 0xd5, 0x9b, 0xfe, 0x31, 0xec, 0xb1, 0x39,
mbedAustin 11:cada08fc8a70 426 0x9b, 0x60, 0x81, 0x48, 0xd1, 0x96, 0x9d, 0x25, 0x0d, 0x3c, 0x1e, 0x94,
mbedAustin 11:cada08fc8a70 427 0x10, 0x10, 0x98, 0x12, 0x93, 0x25, 0xca, 0xb8, 0xfc, 0xcc, 0x2d, 0x54,
mbedAustin 11:cada08fc8a70 428 0x73, 0x19, 0x70, 0xc0, 0x10, 0x7a, 0xa4, 0x89, 0x25, 0x19, 0x95, 0x5e,
mbedAustin 11:cada08fc8a70 429 0x4b, 0xc6, 0x00, 0x1d, 0x7f, 0x4e, 0x6a, 0x2b, 0xf8, 0xa3, 0x01, 0xab,
mbedAustin 11:cada08fc8a70 430 0x46, 0x05, 0x5c, 0x09, 0xa6, 0x71, 0x88, 0xf1, 0xa7, 0x40, 0xee, 0xf3,
mbedAustin 11:cada08fc8a70 431 0xe1, 0x5c, 0x02, 0x9b, 0x44, 0xaf, 0x03, 0x44 };
mbedAustin 11:cada08fc8a70 432
mbedAustin 11:cada08fc8a70 433 /* From a NIST PR=false test vector */
mbedAustin 11:cada08fc8a70 434 static const unsigned char entropy_nopr[] = {
mbedAustin 11:cada08fc8a70 435 0x79, 0x34, 0x9b, 0xbf, 0x7c, 0xdd, 0xa5, 0x79, 0x95, 0x57, 0x86, 0x66,
mbedAustin 11:cada08fc8a70 436 0x21, 0xc9, 0x13, 0x83, 0x11, 0x46, 0x73, 0x3a, 0xbf, 0x8c, 0x35, 0xc8,
mbedAustin 11:cada08fc8a70 437 0xc7, 0x21, 0x5b, 0x5b, 0x96, 0xc4, 0x8e, 0x9b, 0x33, 0x8c, 0x74, 0xe3,
mbedAustin 11:cada08fc8a70 438 0xe9, 0x9d, 0xfe, 0xdf };
mbedAustin 11:cada08fc8a70 439 static const unsigned char result_nopr[OUTPUT_LEN] = {
mbedAustin 11:cada08fc8a70 440 0xc6, 0xa1, 0x6a, 0xb8, 0xd4, 0x20, 0x70, 0x6f, 0x0f, 0x34, 0xab, 0x7f,
mbedAustin 11:cada08fc8a70 441 0xec, 0x5a, 0xdc, 0xa9, 0xd8, 0xca, 0x3a, 0x13, 0x3e, 0x15, 0x9c, 0xa6,
mbedAustin 11:cada08fc8a70 442 0xac, 0x43, 0xc6, 0xf8, 0xa2, 0xbe, 0x22, 0x83, 0x4a, 0x4c, 0x0a, 0x0a,
mbedAustin 11:cada08fc8a70 443 0xff, 0xb1, 0x0d, 0x71, 0x94, 0xf1, 0xc1, 0xa5, 0xcf, 0x73, 0x22, 0xec,
mbedAustin 11:cada08fc8a70 444 0x1a, 0xe0, 0x96, 0x4e, 0xd4, 0xbf, 0x12, 0x27, 0x46, 0xe0, 0x87, 0xfd,
mbedAustin 11:cada08fc8a70 445 0xb5, 0xb3, 0xe9, 0x1b, 0x34, 0x93, 0xd5, 0xbb, 0x98, 0xfa, 0xed, 0x49,
mbedAustin 11:cada08fc8a70 446 0xe8, 0x5f, 0x13, 0x0f, 0xc8, 0xa4, 0x59, 0xb7 };
mbedAustin 11:cada08fc8a70 447
mbedAustin 11:cada08fc8a70 448 /* "Entropy" from buffer */
mbedAustin 11:cada08fc8a70 449 static size_t test_offset;
mbedAustin 11:cada08fc8a70 450 static int hmac_drbg_self_test_entropy( void *data,
mbedAustin 11:cada08fc8a70 451 unsigned char *buf, size_t len )
mbedAustin 11:cada08fc8a70 452 {
mbedAustin 11:cada08fc8a70 453 const unsigned char *p = data;
mbedAustin 11:cada08fc8a70 454 memcpy( buf, p + test_offset, len );
mbedAustin 11:cada08fc8a70 455 test_offset += len;
mbedAustin 11:cada08fc8a70 456 return( 0 );
mbedAustin 11:cada08fc8a70 457 }
mbedAustin 11:cada08fc8a70 458
mbedAustin 11:cada08fc8a70 459 #define CHK( c ) if( (c) != 0 ) \
mbedAustin 11:cada08fc8a70 460 { \
mbedAustin 11:cada08fc8a70 461 if( verbose != 0 ) \
mbedAustin 11:cada08fc8a70 462 mbedtls_printf( "failed\n" ); \
mbedAustin 11:cada08fc8a70 463 return( 1 ); \
mbedAustin 11:cada08fc8a70 464 }
mbedAustin 11:cada08fc8a70 465
mbedAustin 11:cada08fc8a70 466 /*
mbedAustin 11:cada08fc8a70 467 * Checkup routine for HMAC_DRBG with SHA-1
mbedAustin 11:cada08fc8a70 468 */
mbedAustin 11:cada08fc8a70 469 int mbedtls_hmac_drbg_self_test( int verbose )
mbedAustin 11:cada08fc8a70 470 {
mbedAustin 11:cada08fc8a70 471 mbedtls_hmac_drbg_context ctx;
mbedAustin 11:cada08fc8a70 472 unsigned char buf[OUTPUT_LEN];
mbedAustin 11:cada08fc8a70 473 const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
mbedAustin 11:cada08fc8a70 474
mbedAustin 11:cada08fc8a70 475 mbedtls_hmac_drbg_init( &ctx );
mbedAustin 11:cada08fc8a70 476
mbedAustin 11:cada08fc8a70 477 /*
mbedAustin 11:cada08fc8a70 478 * PR = True
mbedAustin 11:cada08fc8a70 479 */
mbedAustin 11:cada08fc8a70 480 if( verbose != 0 )
mbedAustin 11:cada08fc8a70 481 mbedtls_printf( " HMAC_DRBG (PR = True) : " );
mbedAustin 11:cada08fc8a70 482
mbedAustin 11:cada08fc8a70 483 test_offset = 0;
mbedAustin 11:cada08fc8a70 484 CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
mbedAustin 11:cada08fc8a70 485 hmac_drbg_self_test_entropy, (void *) entropy_pr,
mbedAustin 11:cada08fc8a70 486 NULL, 0 ) );
mbedAustin 11:cada08fc8a70 487 mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
mbedAustin 11:cada08fc8a70 488 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
mbedAustin 11:cada08fc8a70 489 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
mbedAustin 11:cada08fc8a70 490 CHK( memcmp( buf, result_pr, OUTPUT_LEN ) );
mbedAustin 11:cada08fc8a70 491 mbedtls_hmac_drbg_free( &ctx );
mbedAustin 11:cada08fc8a70 492
mbedAustin 11:cada08fc8a70 493 mbedtls_hmac_drbg_free( &ctx );
mbedAustin 11:cada08fc8a70 494
mbedAustin 11:cada08fc8a70 495 if( verbose != 0 )
mbedAustin 11:cada08fc8a70 496 mbedtls_printf( "passed\n" );
mbedAustin 11:cada08fc8a70 497
mbedAustin 11:cada08fc8a70 498 /*
mbedAustin 11:cada08fc8a70 499 * PR = False
mbedAustin 11:cada08fc8a70 500 */
mbedAustin 11:cada08fc8a70 501 if( verbose != 0 )
mbedAustin 11:cada08fc8a70 502 mbedtls_printf( " HMAC_DRBG (PR = False) : " );
mbedAustin 11:cada08fc8a70 503
mbedAustin 11:cada08fc8a70 504 mbedtls_hmac_drbg_init( &ctx );
mbedAustin 11:cada08fc8a70 505
mbedAustin 11:cada08fc8a70 506 test_offset = 0;
mbedAustin 11:cada08fc8a70 507 CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
mbedAustin 11:cada08fc8a70 508 hmac_drbg_self_test_entropy, (void *) entropy_nopr,
mbedAustin 11:cada08fc8a70 509 NULL, 0 ) );
mbedAustin 11:cada08fc8a70 510 CHK( mbedtls_hmac_drbg_reseed( &ctx, NULL, 0 ) );
mbedAustin 11:cada08fc8a70 511 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
mbedAustin 11:cada08fc8a70 512 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
mbedAustin 11:cada08fc8a70 513 CHK( memcmp( buf, result_nopr, OUTPUT_LEN ) );
mbedAustin 11:cada08fc8a70 514 mbedtls_hmac_drbg_free( &ctx );
mbedAustin 11:cada08fc8a70 515
mbedAustin 11:cada08fc8a70 516 mbedtls_hmac_drbg_free( &ctx );
mbedAustin 11:cada08fc8a70 517
mbedAustin 11:cada08fc8a70 518 if( verbose != 0 )
mbedAustin 11:cada08fc8a70 519 mbedtls_printf( "passed\n" );
mbedAustin 11:cada08fc8a70 520
mbedAustin 11:cada08fc8a70 521 if( verbose != 0 )
mbedAustin 11:cada08fc8a70 522 mbedtls_printf( "\n" );
mbedAustin 11:cada08fc8a70 523
mbedAustin 11:cada08fc8a70 524 return( 0 );
mbedAustin 11:cada08fc8a70 525 }
mbedAustin 11:cada08fc8a70 526 #endif /* MBEDTLS_SHA1_C */
mbedAustin 11:cada08fc8a70 527 #endif /* MBEDTLS_SELF_TEST */
mbedAustin 11:cada08fc8a70 528
mbedAustin 11:cada08fc8a70 529 #endif /* MBEDTLS_HMAC_DRBG_C */