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features/mbedtls/src/hmac_drbg.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /*
be_bryan 0:b74591d5ab33 2 * HMAC_DRBG implementation (NIST SP 800-90)
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
be_bryan 0:b74591d5ab33 5 * SPDX-License-Identifier: Apache-2.0
be_bryan 0:b74591d5ab33 6 *
be_bryan 0:b74591d5ab33 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
be_bryan 0:b74591d5ab33 8 * not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 9 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 10 *
be_bryan 0:b74591d5ab33 11 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 12 *
be_bryan 0:b74591d5ab33 13 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
be_bryan 0:b74591d5ab33 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 16 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 17 * limitations under the License.
be_bryan 0:b74591d5ab33 18 *
be_bryan 0:b74591d5ab33 19 * This file is part of mbed TLS (https://tls.mbed.org)
be_bryan 0:b74591d5ab33 20 */
be_bryan 0:b74591d5ab33 21
be_bryan 0:b74591d5ab33 22 /*
be_bryan 0:b74591d5ab33 23 * The NIST SP 800-90A DRBGs are described in the following publication.
be_bryan 0:b74591d5ab33 24 * http://csrc.nist.gov/publications/nistpubs/800-90A/SP800-90A.pdf
be_bryan 0:b74591d5ab33 25 * References below are based on rev. 1 (January 2012).
be_bryan 0:b74591d5ab33 26 */
be_bryan 0:b74591d5ab33 27
be_bryan 0:b74591d5ab33 28 #if !defined(MBEDTLS_CONFIG_FILE)
be_bryan 0:b74591d5ab33 29 #include "mbedtls/config.h"
be_bryan 0:b74591d5ab33 30 #else
be_bryan 0:b74591d5ab33 31 #include MBEDTLS_CONFIG_FILE
be_bryan 0:b74591d5ab33 32 #endif
be_bryan 0:b74591d5ab33 33
be_bryan 0:b74591d5ab33 34 #if defined(MBEDTLS_HMAC_DRBG_C)
be_bryan 0:b74591d5ab33 35
be_bryan 0:b74591d5ab33 36 #include "mbedtls/hmac_drbg.h"
be_bryan 0:b74591d5ab33 37
be_bryan 0:b74591d5ab33 38 #include <string.h>
be_bryan 0:b74591d5ab33 39
be_bryan 0:b74591d5ab33 40 #if defined(MBEDTLS_FS_IO)
be_bryan 0:b74591d5ab33 41 #include <stdio.h>
be_bryan 0:b74591d5ab33 42 #endif
be_bryan 0:b74591d5ab33 43
be_bryan 0:b74591d5ab33 44 #if defined(MBEDTLS_SELF_TEST)
be_bryan 0:b74591d5ab33 45 #if defined(MBEDTLS_PLATFORM_C)
be_bryan 0:b74591d5ab33 46 #include "mbedtls/platform.h"
be_bryan 0:b74591d5ab33 47 #else
be_bryan 0:b74591d5ab33 48 #include <stdio.h>
be_bryan 0:b74591d5ab33 49 #define mbedtls_printf printf
be_bryan 0:b74591d5ab33 50 #endif /* MBEDTLS_SELF_TEST */
be_bryan 0:b74591d5ab33 51 #endif /* MBEDTLS_PLATFORM_C */
be_bryan 0:b74591d5ab33 52
be_bryan 0:b74591d5ab33 53 /* Implementation that should never be optimized out by the compiler */
be_bryan 0:b74591d5ab33 54 static void mbedtls_zeroize( void *v, size_t n ) {
be_bryan 0:b74591d5ab33 55 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
be_bryan 0:b74591d5ab33 56 }
be_bryan 0:b74591d5ab33 57
be_bryan 0:b74591d5ab33 58 /*
be_bryan 0:b74591d5ab33 59 * HMAC_DRBG context initialization
be_bryan 0:b74591d5ab33 60 */
be_bryan 0:b74591d5ab33 61 void mbedtls_hmac_drbg_init( mbedtls_hmac_drbg_context *ctx )
be_bryan 0:b74591d5ab33 62 {
be_bryan 0:b74591d5ab33 63 memset( ctx, 0, sizeof( mbedtls_hmac_drbg_context ) );
be_bryan 0:b74591d5ab33 64
be_bryan 0:b74591d5ab33 65 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 66 mbedtls_mutex_init( &ctx->mutex );
be_bryan 0:b74591d5ab33 67 #endif
be_bryan 0:b74591d5ab33 68 }
be_bryan 0:b74591d5ab33 69
be_bryan 0:b74591d5ab33 70 /*
be_bryan 0:b74591d5ab33 71 * HMAC_DRBG update, using optional additional data (10.1.2.2)
be_bryan 0:b74591d5ab33 72 */
be_bryan 0:b74591d5ab33 73 void mbedtls_hmac_drbg_update( mbedtls_hmac_drbg_context *ctx,
be_bryan 0:b74591d5ab33 74 const unsigned char *additional, size_t add_len )
be_bryan 0:b74591d5ab33 75 {
be_bryan 0:b74591d5ab33 76 size_t md_len = mbedtls_md_get_size( ctx->md_ctx.md_info );
be_bryan 0:b74591d5ab33 77 unsigned char rounds = ( additional != NULL && add_len != 0 ) ? 2 : 1;
be_bryan 0:b74591d5ab33 78 unsigned char sep[1];
be_bryan 0:b74591d5ab33 79 unsigned char K[MBEDTLS_MD_MAX_SIZE];
be_bryan 0:b74591d5ab33 80
be_bryan 0:b74591d5ab33 81 for( sep[0] = 0; sep[0] < rounds; sep[0]++ )
be_bryan 0:b74591d5ab33 82 {
be_bryan 0:b74591d5ab33 83 /* Step 1 or 4 */
be_bryan 0:b74591d5ab33 84 mbedtls_md_hmac_reset( &ctx->md_ctx );
be_bryan 0:b74591d5ab33 85 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
be_bryan 0:b74591d5ab33 86 mbedtls_md_hmac_update( &ctx->md_ctx, sep, 1 );
be_bryan 0:b74591d5ab33 87 if( rounds == 2 )
be_bryan 0:b74591d5ab33 88 mbedtls_md_hmac_update( &ctx->md_ctx, additional, add_len );
be_bryan 0:b74591d5ab33 89 mbedtls_md_hmac_finish( &ctx->md_ctx, K );
be_bryan 0:b74591d5ab33 90
be_bryan 0:b74591d5ab33 91 /* Step 2 or 5 */
be_bryan 0:b74591d5ab33 92 mbedtls_md_hmac_starts( &ctx->md_ctx, K, md_len );
be_bryan 0:b74591d5ab33 93 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
be_bryan 0:b74591d5ab33 94 mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V );
be_bryan 0:b74591d5ab33 95 }
be_bryan 0:b74591d5ab33 96 }
be_bryan 0:b74591d5ab33 97
be_bryan 0:b74591d5ab33 98 /*
be_bryan 0:b74591d5ab33 99 * Simplified HMAC_DRBG initialisation (for use with deterministic ECDSA)
be_bryan 0:b74591d5ab33 100 */
be_bryan 0:b74591d5ab33 101 int mbedtls_hmac_drbg_seed_buf( mbedtls_hmac_drbg_context *ctx,
be_bryan 0:b74591d5ab33 102 const mbedtls_md_info_t * md_info,
be_bryan 0:b74591d5ab33 103 const unsigned char *data, size_t data_len )
be_bryan 0:b74591d5ab33 104 {
be_bryan 0:b74591d5ab33 105 int ret;
be_bryan 0:b74591d5ab33 106
be_bryan 0:b74591d5ab33 107 if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
be_bryan 0:b74591d5ab33 108 return( ret );
be_bryan 0:b74591d5ab33 109
be_bryan 0:b74591d5ab33 110 /*
be_bryan 0:b74591d5ab33 111 * Set initial working state.
be_bryan 0:b74591d5ab33 112 * Use the V memory location, which is currently all 0, to initialize the
be_bryan 0:b74591d5ab33 113 * MD context with an all-zero key. Then set V to its initial value.
be_bryan 0:b74591d5ab33 114 */
be_bryan 0:b74591d5ab33 115 mbedtls_md_hmac_starts( &ctx->md_ctx, ctx->V, mbedtls_md_get_size( md_info ) );
be_bryan 0:b74591d5ab33 116 memset( ctx->V, 0x01, mbedtls_md_get_size( md_info ) );
be_bryan 0:b74591d5ab33 117
be_bryan 0:b74591d5ab33 118 mbedtls_hmac_drbg_update( ctx, data, data_len );
be_bryan 0:b74591d5ab33 119
be_bryan 0:b74591d5ab33 120 return( 0 );
be_bryan 0:b74591d5ab33 121 }
be_bryan 0:b74591d5ab33 122
be_bryan 0:b74591d5ab33 123 /*
be_bryan 0:b74591d5ab33 124 * HMAC_DRBG reseeding: 10.1.2.4 (arabic) + 9.2 (Roman)
be_bryan 0:b74591d5ab33 125 */
be_bryan 0:b74591d5ab33 126 int mbedtls_hmac_drbg_reseed( mbedtls_hmac_drbg_context *ctx,
be_bryan 0:b74591d5ab33 127 const unsigned char *additional, size_t len )
be_bryan 0:b74591d5ab33 128 {
be_bryan 0:b74591d5ab33 129 unsigned char seed[MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT];
be_bryan 0:b74591d5ab33 130 size_t seedlen;
be_bryan 0:b74591d5ab33 131
be_bryan 0:b74591d5ab33 132 /* III. Check input length */
be_bryan 0:b74591d5ab33 133 if( len > MBEDTLS_HMAC_DRBG_MAX_INPUT ||
be_bryan 0:b74591d5ab33 134 ctx->entropy_len + len > MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT )
be_bryan 0:b74591d5ab33 135 {
be_bryan 0:b74591d5ab33 136 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
be_bryan 0:b74591d5ab33 137 }
be_bryan 0:b74591d5ab33 138
be_bryan 0:b74591d5ab33 139 memset( seed, 0, MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT );
be_bryan 0:b74591d5ab33 140
be_bryan 0:b74591d5ab33 141 /* IV. Gather entropy_len bytes of entropy for the seed */
be_bryan 0:b74591d5ab33 142 if( ctx->f_entropy( ctx->p_entropy, seed, ctx->entropy_len ) != 0 )
be_bryan 0:b74591d5ab33 143 return( MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED );
be_bryan 0:b74591d5ab33 144
be_bryan 0:b74591d5ab33 145 seedlen = ctx->entropy_len;
be_bryan 0:b74591d5ab33 146
be_bryan 0:b74591d5ab33 147 /* 1. Concatenate entropy and additional data if any */
be_bryan 0:b74591d5ab33 148 if( additional != NULL && len != 0 )
be_bryan 0:b74591d5ab33 149 {
be_bryan 0:b74591d5ab33 150 memcpy( seed + seedlen, additional, len );
be_bryan 0:b74591d5ab33 151 seedlen += len;
be_bryan 0:b74591d5ab33 152 }
be_bryan 0:b74591d5ab33 153
be_bryan 0:b74591d5ab33 154 /* 2. Update state */
be_bryan 0:b74591d5ab33 155 mbedtls_hmac_drbg_update( ctx, seed, seedlen );
be_bryan 0:b74591d5ab33 156
be_bryan 0:b74591d5ab33 157 /* 3. Reset reseed_counter */
be_bryan 0:b74591d5ab33 158 ctx->reseed_counter = 1;
be_bryan 0:b74591d5ab33 159
be_bryan 0:b74591d5ab33 160 /* 4. Done */
be_bryan 0:b74591d5ab33 161 return( 0 );
be_bryan 0:b74591d5ab33 162 }
be_bryan 0:b74591d5ab33 163
be_bryan 0:b74591d5ab33 164 /*
be_bryan 0:b74591d5ab33 165 * HMAC_DRBG initialisation (10.1.2.3 + 9.1)
be_bryan 0:b74591d5ab33 166 */
be_bryan 0:b74591d5ab33 167 int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
be_bryan 0:b74591d5ab33 168 const mbedtls_md_info_t * md_info,
be_bryan 0:b74591d5ab33 169 int (*f_entropy)(void *, unsigned char *, size_t),
be_bryan 0:b74591d5ab33 170 void *p_entropy,
be_bryan 0:b74591d5ab33 171 const unsigned char *custom,
be_bryan 0:b74591d5ab33 172 size_t len )
be_bryan 0:b74591d5ab33 173 {
be_bryan 0:b74591d5ab33 174 int ret;
be_bryan 0:b74591d5ab33 175 size_t entropy_len, md_size;
be_bryan 0:b74591d5ab33 176
be_bryan 0:b74591d5ab33 177 if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
be_bryan 0:b74591d5ab33 178 return( ret );
be_bryan 0:b74591d5ab33 179
be_bryan 0:b74591d5ab33 180 md_size = mbedtls_md_get_size( md_info );
be_bryan 0:b74591d5ab33 181
be_bryan 0:b74591d5ab33 182 /*
be_bryan 0:b74591d5ab33 183 * Set initial working state.
be_bryan 0:b74591d5ab33 184 * Use the V memory location, which is currently all 0, to initialize the
be_bryan 0:b74591d5ab33 185 * MD context with an all-zero key. Then set V to its initial value.
be_bryan 0:b74591d5ab33 186 */
be_bryan 0:b74591d5ab33 187 mbedtls_md_hmac_starts( &ctx->md_ctx, ctx->V, md_size );
be_bryan 0:b74591d5ab33 188 memset( ctx->V, 0x01, md_size );
be_bryan 0:b74591d5ab33 189
be_bryan 0:b74591d5ab33 190 ctx->f_entropy = f_entropy;
be_bryan 0:b74591d5ab33 191 ctx->p_entropy = p_entropy;
be_bryan 0:b74591d5ab33 192
be_bryan 0:b74591d5ab33 193 ctx->reseed_interval = MBEDTLS_HMAC_DRBG_RESEED_INTERVAL;
be_bryan 0:b74591d5ab33 194
be_bryan 0:b74591d5ab33 195 /*
be_bryan 0:b74591d5ab33 196 * See SP800-57 5.6.1 (p. 65-66) for the security strength provided by
be_bryan 0:b74591d5ab33 197 * each hash function, then according to SP800-90A rev1 10.1 table 2,
be_bryan 0:b74591d5ab33 198 * min_entropy_len (in bits) is security_strength.
be_bryan 0:b74591d5ab33 199 *
be_bryan 0:b74591d5ab33 200 * (This also matches the sizes used in the NIST test vectors.)
be_bryan 0:b74591d5ab33 201 */
be_bryan 0:b74591d5ab33 202 entropy_len = md_size <= 20 ? 16 : /* 160-bits hash -> 128 bits */
be_bryan 0:b74591d5ab33 203 md_size <= 28 ? 24 : /* 224-bits hash -> 192 bits */
be_bryan 0:b74591d5ab33 204 32; /* better (256+) -> 256 bits */
be_bryan 0:b74591d5ab33 205
be_bryan 0:b74591d5ab33 206 /*
be_bryan 0:b74591d5ab33 207 * For initialisation, use more entropy to emulate a nonce
be_bryan 0:b74591d5ab33 208 * (Again, matches test vectors.)
be_bryan 0:b74591d5ab33 209 */
be_bryan 0:b74591d5ab33 210 ctx->entropy_len = entropy_len * 3 / 2;
be_bryan 0:b74591d5ab33 211
be_bryan 0:b74591d5ab33 212 if( ( ret = mbedtls_hmac_drbg_reseed( ctx, custom, len ) ) != 0 )
be_bryan 0:b74591d5ab33 213 return( ret );
be_bryan 0:b74591d5ab33 214
be_bryan 0:b74591d5ab33 215 ctx->entropy_len = entropy_len;
be_bryan 0:b74591d5ab33 216
be_bryan 0:b74591d5ab33 217 return( 0 );
be_bryan 0:b74591d5ab33 218 }
be_bryan 0:b74591d5ab33 219
be_bryan 0:b74591d5ab33 220 /*
be_bryan 0:b74591d5ab33 221 * Set prediction resistance
be_bryan 0:b74591d5ab33 222 */
be_bryan 0:b74591d5ab33 223 void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx,
be_bryan 0:b74591d5ab33 224 int resistance )
be_bryan 0:b74591d5ab33 225 {
be_bryan 0:b74591d5ab33 226 ctx->prediction_resistance = resistance;
be_bryan 0:b74591d5ab33 227 }
be_bryan 0:b74591d5ab33 228
be_bryan 0:b74591d5ab33 229 /*
be_bryan 0:b74591d5ab33 230 * Set entropy length grabbed for reseeds
be_bryan 0:b74591d5ab33 231 */
be_bryan 0:b74591d5ab33 232 void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx, size_t len )
be_bryan 0:b74591d5ab33 233 {
be_bryan 0:b74591d5ab33 234 ctx->entropy_len = len;
be_bryan 0:b74591d5ab33 235 }
be_bryan 0:b74591d5ab33 236
be_bryan 0:b74591d5ab33 237 /*
be_bryan 0:b74591d5ab33 238 * Set reseed interval
be_bryan 0:b74591d5ab33 239 */
be_bryan 0:b74591d5ab33 240 void mbedtls_hmac_drbg_set_reseed_interval( mbedtls_hmac_drbg_context *ctx, int interval )
be_bryan 0:b74591d5ab33 241 {
be_bryan 0:b74591d5ab33 242 ctx->reseed_interval = interval;
be_bryan 0:b74591d5ab33 243 }
be_bryan 0:b74591d5ab33 244
be_bryan 0:b74591d5ab33 245 /*
be_bryan 0:b74591d5ab33 246 * HMAC_DRBG random function with optional additional data:
be_bryan 0:b74591d5ab33 247 * 10.1.2.5 (arabic) + 9.3 (Roman)
be_bryan 0:b74591d5ab33 248 */
be_bryan 0:b74591d5ab33 249 int mbedtls_hmac_drbg_random_with_add( void *p_rng,
be_bryan 0:b74591d5ab33 250 unsigned char *output, size_t out_len,
be_bryan 0:b74591d5ab33 251 const unsigned char *additional, size_t add_len )
be_bryan 0:b74591d5ab33 252 {
be_bryan 0:b74591d5ab33 253 int ret;
be_bryan 0:b74591d5ab33 254 mbedtls_hmac_drbg_context *ctx = (mbedtls_hmac_drbg_context *) p_rng;
be_bryan 0:b74591d5ab33 255 size_t md_len = mbedtls_md_get_size( ctx->md_ctx.md_info );
be_bryan 0:b74591d5ab33 256 size_t left = out_len;
be_bryan 0:b74591d5ab33 257 unsigned char *out = output;
be_bryan 0:b74591d5ab33 258
be_bryan 0:b74591d5ab33 259 /* II. Check request length */
be_bryan 0:b74591d5ab33 260 if( out_len > MBEDTLS_HMAC_DRBG_MAX_REQUEST )
be_bryan 0:b74591d5ab33 261 return( MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG );
be_bryan 0:b74591d5ab33 262
be_bryan 0:b74591d5ab33 263 /* III. Check input length */
be_bryan 0:b74591d5ab33 264 if( add_len > MBEDTLS_HMAC_DRBG_MAX_INPUT )
be_bryan 0:b74591d5ab33 265 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
be_bryan 0:b74591d5ab33 266
be_bryan 0:b74591d5ab33 267 /* 1. (aka VII and IX) Check reseed counter and PR */
be_bryan 0:b74591d5ab33 268 if( ctx->f_entropy != NULL && /* For no-reseeding instances */
be_bryan 0:b74591d5ab33 269 ( ctx->prediction_resistance == MBEDTLS_HMAC_DRBG_PR_ON ||
be_bryan 0:b74591d5ab33 270 ctx->reseed_counter > ctx->reseed_interval ) )
be_bryan 0:b74591d5ab33 271 {
be_bryan 0:b74591d5ab33 272 if( ( ret = mbedtls_hmac_drbg_reseed( ctx, additional, add_len ) ) != 0 )
be_bryan 0:b74591d5ab33 273 return( ret );
be_bryan 0:b74591d5ab33 274
be_bryan 0:b74591d5ab33 275 add_len = 0; /* VII.4 */
be_bryan 0:b74591d5ab33 276 }
be_bryan 0:b74591d5ab33 277
be_bryan 0:b74591d5ab33 278 /* 2. Use additional data if any */
be_bryan 0:b74591d5ab33 279 if( additional != NULL && add_len != 0 )
be_bryan 0:b74591d5ab33 280 mbedtls_hmac_drbg_update( ctx, additional, add_len );
be_bryan 0:b74591d5ab33 281
be_bryan 0:b74591d5ab33 282 /* 3, 4, 5. Generate bytes */
be_bryan 0:b74591d5ab33 283 while( left != 0 )
be_bryan 0:b74591d5ab33 284 {
be_bryan 0:b74591d5ab33 285 size_t use_len = left > md_len ? md_len : left;
be_bryan 0:b74591d5ab33 286
be_bryan 0:b74591d5ab33 287 mbedtls_md_hmac_reset( &ctx->md_ctx );
be_bryan 0:b74591d5ab33 288 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
be_bryan 0:b74591d5ab33 289 mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V );
be_bryan 0:b74591d5ab33 290
be_bryan 0:b74591d5ab33 291 memcpy( out, ctx->V, use_len );
be_bryan 0:b74591d5ab33 292 out += use_len;
be_bryan 0:b74591d5ab33 293 left -= use_len;
be_bryan 0:b74591d5ab33 294 }
be_bryan 0:b74591d5ab33 295
be_bryan 0:b74591d5ab33 296 /* 6. Update */
be_bryan 0:b74591d5ab33 297 mbedtls_hmac_drbg_update( ctx, additional, add_len );
be_bryan 0:b74591d5ab33 298
be_bryan 0:b74591d5ab33 299 /* 7. Update reseed counter */
be_bryan 0:b74591d5ab33 300 ctx->reseed_counter++;
be_bryan 0:b74591d5ab33 301
be_bryan 0:b74591d5ab33 302 /* 8. Done */
be_bryan 0:b74591d5ab33 303 return( 0 );
be_bryan 0:b74591d5ab33 304 }
be_bryan 0:b74591d5ab33 305
be_bryan 0:b74591d5ab33 306 /*
be_bryan 0:b74591d5ab33 307 * HMAC_DRBG random function
be_bryan 0:b74591d5ab33 308 */
be_bryan 0:b74591d5ab33 309 int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len )
be_bryan 0:b74591d5ab33 310 {
be_bryan 0:b74591d5ab33 311 int ret;
be_bryan 0:b74591d5ab33 312 mbedtls_hmac_drbg_context *ctx = (mbedtls_hmac_drbg_context *) p_rng;
be_bryan 0:b74591d5ab33 313
be_bryan 0:b74591d5ab33 314 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 315 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
be_bryan 0:b74591d5ab33 316 return( ret );
be_bryan 0:b74591d5ab33 317 #endif
be_bryan 0:b74591d5ab33 318
be_bryan 0:b74591d5ab33 319 ret = mbedtls_hmac_drbg_random_with_add( ctx, output, out_len, NULL, 0 );
be_bryan 0:b74591d5ab33 320
be_bryan 0:b74591d5ab33 321 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 322 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
be_bryan 0:b74591d5ab33 323 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
be_bryan 0:b74591d5ab33 324 #endif
be_bryan 0:b74591d5ab33 325
be_bryan 0:b74591d5ab33 326 return( ret );
be_bryan 0:b74591d5ab33 327 }
be_bryan 0:b74591d5ab33 328
be_bryan 0:b74591d5ab33 329 /*
be_bryan 0:b74591d5ab33 330 * Free an HMAC_DRBG context
be_bryan 0:b74591d5ab33 331 */
be_bryan 0:b74591d5ab33 332 void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx )
be_bryan 0:b74591d5ab33 333 {
be_bryan 0:b74591d5ab33 334 if( ctx == NULL )
be_bryan 0:b74591d5ab33 335 return;
be_bryan 0:b74591d5ab33 336
be_bryan 0:b74591d5ab33 337 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 338 mbedtls_mutex_free( &ctx->mutex );
be_bryan 0:b74591d5ab33 339 #endif
be_bryan 0:b74591d5ab33 340 mbedtls_md_free( &ctx->md_ctx );
be_bryan 0:b74591d5ab33 341 mbedtls_zeroize( ctx, sizeof( mbedtls_hmac_drbg_context ) );
be_bryan 0:b74591d5ab33 342 }
be_bryan 0:b74591d5ab33 343
be_bryan 0:b74591d5ab33 344 #if defined(MBEDTLS_FS_IO)
be_bryan 0:b74591d5ab33 345 int mbedtls_hmac_drbg_write_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
be_bryan 0:b74591d5ab33 346 {
be_bryan 0:b74591d5ab33 347 int ret;
be_bryan 0:b74591d5ab33 348 FILE *f;
be_bryan 0:b74591d5ab33 349 unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
be_bryan 0:b74591d5ab33 350
be_bryan 0:b74591d5ab33 351 if( ( f = fopen( path, "wb" ) ) == NULL )
be_bryan 0:b74591d5ab33 352 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
be_bryan 0:b74591d5ab33 353
be_bryan 0:b74591d5ab33 354 if( ( ret = mbedtls_hmac_drbg_random( ctx, buf, sizeof( buf ) ) ) != 0 )
be_bryan 0:b74591d5ab33 355 goto exit;
be_bryan 0:b74591d5ab33 356
be_bryan 0:b74591d5ab33 357 if( fwrite( buf, 1, sizeof( buf ), f ) != sizeof( buf ) )
be_bryan 0:b74591d5ab33 358 {
be_bryan 0:b74591d5ab33 359 ret = MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR;
be_bryan 0:b74591d5ab33 360 goto exit;
be_bryan 0:b74591d5ab33 361 }
be_bryan 0:b74591d5ab33 362
be_bryan 0:b74591d5ab33 363 ret = 0;
be_bryan 0:b74591d5ab33 364
be_bryan 0:b74591d5ab33 365 exit:
be_bryan 0:b74591d5ab33 366 fclose( f );
be_bryan 0:b74591d5ab33 367 return( ret );
be_bryan 0:b74591d5ab33 368 }
be_bryan 0:b74591d5ab33 369
be_bryan 0:b74591d5ab33 370 int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
be_bryan 0:b74591d5ab33 371 {
be_bryan 0:b74591d5ab33 372 FILE *f;
be_bryan 0:b74591d5ab33 373 size_t n;
be_bryan 0:b74591d5ab33 374 unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
be_bryan 0:b74591d5ab33 375
be_bryan 0:b74591d5ab33 376 if( ( f = fopen( path, "rb" ) ) == NULL )
be_bryan 0:b74591d5ab33 377 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
be_bryan 0:b74591d5ab33 378
be_bryan 0:b74591d5ab33 379 fseek( f, 0, SEEK_END );
be_bryan 0:b74591d5ab33 380 n = (size_t) ftell( f );
be_bryan 0:b74591d5ab33 381 fseek( f, 0, SEEK_SET );
be_bryan 0:b74591d5ab33 382
be_bryan 0:b74591d5ab33 383 if( n > MBEDTLS_HMAC_DRBG_MAX_INPUT )
be_bryan 0:b74591d5ab33 384 {
be_bryan 0:b74591d5ab33 385 fclose( f );
be_bryan 0:b74591d5ab33 386 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
be_bryan 0:b74591d5ab33 387 }
be_bryan 0:b74591d5ab33 388
be_bryan 0:b74591d5ab33 389 if( fread( buf, 1, n, f ) != n )
be_bryan 0:b74591d5ab33 390 {
be_bryan 0:b74591d5ab33 391 fclose( f );
be_bryan 0:b74591d5ab33 392 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
be_bryan 0:b74591d5ab33 393 }
be_bryan 0:b74591d5ab33 394
be_bryan 0:b74591d5ab33 395 fclose( f );
be_bryan 0:b74591d5ab33 396
be_bryan 0:b74591d5ab33 397 mbedtls_hmac_drbg_update( ctx, buf, n );
be_bryan 0:b74591d5ab33 398
be_bryan 0:b74591d5ab33 399 return( mbedtls_hmac_drbg_write_seed_file( ctx, path ) );
be_bryan 0:b74591d5ab33 400 }
be_bryan 0:b74591d5ab33 401 #endif /* MBEDTLS_FS_IO */
be_bryan 0:b74591d5ab33 402
be_bryan 0:b74591d5ab33 403
be_bryan 0:b74591d5ab33 404 #if defined(MBEDTLS_SELF_TEST)
be_bryan 0:b74591d5ab33 405
be_bryan 0:b74591d5ab33 406 #if !defined(MBEDTLS_SHA1_C)
be_bryan 0:b74591d5ab33 407 /* Dummy checkup routine */
be_bryan 0:b74591d5ab33 408 int mbedtls_hmac_drbg_self_test( int verbose )
be_bryan 0:b74591d5ab33 409 {
be_bryan 0:b74591d5ab33 410 (void) verbose;
be_bryan 0:b74591d5ab33 411 return( 0 );
be_bryan 0:b74591d5ab33 412 }
be_bryan 0:b74591d5ab33 413 #else
be_bryan 0:b74591d5ab33 414
be_bryan 0:b74591d5ab33 415 #define OUTPUT_LEN 80
be_bryan 0:b74591d5ab33 416
be_bryan 0:b74591d5ab33 417 /* From a NIST PR=true test vector */
be_bryan 0:b74591d5ab33 418 static const unsigned char entropy_pr[] = {
be_bryan 0:b74591d5ab33 419 0xa0, 0xc9, 0xab, 0x58, 0xf1, 0xe2, 0xe5, 0xa4, 0xde, 0x3e, 0xbd, 0x4f,
be_bryan 0:b74591d5ab33 420 0xf7, 0x3e, 0x9c, 0x5b, 0x64, 0xef, 0xd8, 0xca, 0x02, 0x8c, 0xf8, 0x11,
be_bryan 0:b74591d5ab33 421 0x48, 0xa5, 0x84, 0xfe, 0x69, 0xab, 0x5a, 0xee, 0x42, 0xaa, 0x4d, 0x42,
be_bryan 0:b74591d5ab33 422 0x17, 0x60, 0x99, 0xd4, 0x5e, 0x13, 0x97, 0xdc, 0x40, 0x4d, 0x86, 0xa3,
be_bryan 0:b74591d5ab33 423 0x7b, 0xf5, 0x59, 0x54, 0x75, 0x69, 0x51, 0xe4 };
be_bryan 0:b74591d5ab33 424 static const unsigned char result_pr[OUTPUT_LEN] = {
be_bryan 0:b74591d5ab33 425 0x9a, 0x00, 0xa2, 0xd0, 0x0e, 0xd5, 0x9b, 0xfe, 0x31, 0xec, 0xb1, 0x39,
be_bryan 0:b74591d5ab33 426 0x9b, 0x60, 0x81, 0x48, 0xd1, 0x96, 0x9d, 0x25, 0x0d, 0x3c, 0x1e, 0x94,
be_bryan 0:b74591d5ab33 427 0x10, 0x10, 0x98, 0x12, 0x93, 0x25, 0xca, 0xb8, 0xfc, 0xcc, 0x2d, 0x54,
be_bryan 0:b74591d5ab33 428 0x73, 0x19, 0x70, 0xc0, 0x10, 0x7a, 0xa4, 0x89, 0x25, 0x19, 0x95, 0x5e,
be_bryan 0:b74591d5ab33 429 0x4b, 0xc6, 0x00, 0x1d, 0x7f, 0x4e, 0x6a, 0x2b, 0xf8, 0xa3, 0x01, 0xab,
be_bryan 0:b74591d5ab33 430 0x46, 0x05, 0x5c, 0x09, 0xa6, 0x71, 0x88, 0xf1, 0xa7, 0x40, 0xee, 0xf3,
be_bryan 0:b74591d5ab33 431 0xe1, 0x5c, 0x02, 0x9b, 0x44, 0xaf, 0x03, 0x44 };
be_bryan 0:b74591d5ab33 432
be_bryan 0:b74591d5ab33 433 /* From a NIST PR=false test vector */
be_bryan 0:b74591d5ab33 434 static const unsigned char entropy_nopr[] = {
be_bryan 0:b74591d5ab33 435 0x79, 0x34, 0x9b, 0xbf, 0x7c, 0xdd, 0xa5, 0x79, 0x95, 0x57, 0x86, 0x66,
be_bryan 0:b74591d5ab33 436 0x21, 0xc9, 0x13, 0x83, 0x11, 0x46, 0x73, 0x3a, 0xbf, 0x8c, 0x35, 0xc8,
be_bryan 0:b74591d5ab33 437 0xc7, 0x21, 0x5b, 0x5b, 0x96, 0xc4, 0x8e, 0x9b, 0x33, 0x8c, 0x74, 0xe3,
be_bryan 0:b74591d5ab33 438 0xe9, 0x9d, 0xfe, 0xdf };
be_bryan 0:b74591d5ab33 439 static const unsigned char result_nopr[OUTPUT_LEN] = {
be_bryan 0:b74591d5ab33 440 0xc6, 0xa1, 0x6a, 0xb8, 0xd4, 0x20, 0x70, 0x6f, 0x0f, 0x34, 0xab, 0x7f,
be_bryan 0:b74591d5ab33 441 0xec, 0x5a, 0xdc, 0xa9, 0xd8, 0xca, 0x3a, 0x13, 0x3e, 0x15, 0x9c, 0xa6,
be_bryan 0:b74591d5ab33 442 0xac, 0x43, 0xc6, 0xf8, 0xa2, 0xbe, 0x22, 0x83, 0x4a, 0x4c, 0x0a, 0x0a,
be_bryan 0:b74591d5ab33 443 0xff, 0xb1, 0x0d, 0x71, 0x94, 0xf1, 0xc1, 0xa5, 0xcf, 0x73, 0x22, 0xec,
be_bryan 0:b74591d5ab33 444 0x1a, 0xe0, 0x96, 0x4e, 0xd4, 0xbf, 0x12, 0x27, 0x46, 0xe0, 0x87, 0xfd,
be_bryan 0:b74591d5ab33 445 0xb5, 0xb3, 0xe9, 0x1b, 0x34, 0x93, 0xd5, 0xbb, 0x98, 0xfa, 0xed, 0x49,
be_bryan 0:b74591d5ab33 446 0xe8, 0x5f, 0x13, 0x0f, 0xc8, 0xa4, 0x59, 0xb7 };
be_bryan 0:b74591d5ab33 447
be_bryan 0:b74591d5ab33 448 /* "Entropy" from buffer */
be_bryan 0:b74591d5ab33 449 static size_t test_offset;
be_bryan 0:b74591d5ab33 450 static int hmac_drbg_self_test_entropy( void *data,
be_bryan 0:b74591d5ab33 451 unsigned char *buf, size_t len )
be_bryan 0:b74591d5ab33 452 {
be_bryan 0:b74591d5ab33 453 const unsigned char *p = data;
be_bryan 0:b74591d5ab33 454 memcpy( buf, p + test_offset, len );
be_bryan 0:b74591d5ab33 455 test_offset += len;
be_bryan 0:b74591d5ab33 456 return( 0 );
be_bryan 0:b74591d5ab33 457 }
be_bryan 0:b74591d5ab33 458
be_bryan 0:b74591d5ab33 459 #define CHK( c ) if( (c) != 0 ) \
be_bryan 0:b74591d5ab33 460 { \
be_bryan 0:b74591d5ab33 461 if( verbose != 0 ) \
be_bryan 0:b74591d5ab33 462 mbedtls_printf( "failed\n" ); \
be_bryan 0:b74591d5ab33 463 return( 1 ); \
be_bryan 0:b74591d5ab33 464 }
be_bryan 0:b74591d5ab33 465
be_bryan 0:b74591d5ab33 466 /*
be_bryan 0:b74591d5ab33 467 * Checkup routine for HMAC_DRBG with SHA-1
be_bryan 0:b74591d5ab33 468 */
be_bryan 0:b74591d5ab33 469 int mbedtls_hmac_drbg_self_test( int verbose )
be_bryan 0:b74591d5ab33 470 {
be_bryan 0:b74591d5ab33 471 mbedtls_hmac_drbg_context ctx;
be_bryan 0:b74591d5ab33 472 unsigned char buf[OUTPUT_LEN];
be_bryan 0:b74591d5ab33 473 const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
be_bryan 0:b74591d5ab33 474
be_bryan 0:b74591d5ab33 475 mbedtls_hmac_drbg_init( &ctx );
be_bryan 0:b74591d5ab33 476
be_bryan 0:b74591d5ab33 477 /*
be_bryan 0:b74591d5ab33 478 * PR = True
be_bryan 0:b74591d5ab33 479 */
be_bryan 0:b74591d5ab33 480 if( verbose != 0 )
be_bryan 0:b74591d5ab33 481 mbedtls_printf( " HMAC_DRBG (PR = True) : " );
be_bryan 0:b74591d5ab33 482
be_bryan 0:b74591d5ab33 483 test_offset = 0;
be_bryan 0:b74591d5ab33 484 CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
be_bryan 0:b74591d5ab33 485 hmac_drbg_self_test_entropy, (void *) entropy_pr,
be_bryan 0:b74591d5ab33 486 NULL, 0 ) );
be_bryan 0:b74591d5ab33 487 mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
be_bryan 0:b74591d5ab33 488 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
be_bryan 0:b74591d5ab33 489 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
be_bryan 0:b74591d5ab33 490 CHK( memcmp( buf, result_pr, OUTPUT_LEN ) );
be_bryan 0:b74591d5ab33 491 mbedtls_hmac_drbg_free( &ctx );
be_bryan 0:b74591d5ab33 492
be_bryan 0:b74591d5ab33 493 mbedtls_hmac_drbg_free( &ctx );
be_bryan 0:b74591d5ab33 494
be_bryan 0:b74591d5ab33 495 if( verbose != 0 )
be_bryan 0:b74591d5ab33 496 mbedtls_printf( "passed\n" );
be_bryan 0:b74591d5ab33 497
be_bryan 0:b74591d5ab33 498 /*
be_bryan 0:b74591d5ab33 499 * PR = False
be_bryan 0:b74591d5ab33 500 */
be_bryan 0:b74591d5ab33 501 if( verbose != 0 )
be_bryan 0:b74591d5ab33 502 mbedtls_printf( " HMAC_DRBG (PR = False) : " );
be_bryan 0:b74591d5ab33 503
be_bryan 0:b74591d5ab33 504 mbedtls_hmac_drbg_init( &ctx );
be_bryan 0:b74591d5ab33 505
be_bryan 0:b74591d5ab33 506 test_offset = 0;
be_bryan 0:b74591d5ab33 507 CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
be_bryan 0:b74591d5ab33 508 hmac_drbg_self_test_entropy, (void *) entropy_nopr,
be_bryan 0:b74591d5ab33 509 NULL, 0 ) );
be_bryan 0:b74591d5ab33 510 CHK( mbedtls_hmac_drbg_reseed( &ctx, NULL, 0 ) );
be_bryan 0:b74591d5ab33 511 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
be_bryan 0:b74591d5ab33 512 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
be_bryan 0:b74591d5ab33 513 CHK( memcmp( buf, result_nopr, OUTPUT_LEN ) );
be_bryan 0:b74591d5ab33 514 mbedtls_hmac_drbg_free( &ctx );
be_bryan 0:b74591d5ab33 515
be_bryan 0:b74591d5ab33 516 mbedtls_hmac_drbg_free( &ctx );
be_bryan 0:b74591d5ab33 517
be_bryan 0:b74591d5ab33 518 if( verbose != 0 )
be_bryan 0:b74591d5ab33 519 mbedtls_printf( "passed\n" );
be_bryan 0:b74591d5ab33 520
be_bryan 0:b74591d5ab33 521 if( verbose != 0 )
be_bryan 0:b74591d5ab33 522 mbedtls_printf( "\n" );
be_bryan 0:b74591d5ab33 523
be_bryan 0:b74591d5ab33 524 return( 0 );
be_bryan 0:b74591d5ab33 525 }
be_bryan 0:b74591d5ab33 526 #endif /* MBEDTLS_SHA1_C */
be_bryan 0:b74591d5ab33 527 #endif /* MBEDTLS_SELF_TEST */
be_bryan 0:b74591d5ab33 528
be_bryan 0:b74591d5ab33 529 #endif /* MBEDTLS_HMAC_DRBG_C */