Greg Steiert / pegasus_dev

Dependents:   blinky_max32630fthr

features/mbedtls/src/hmac_drbg.c@3:1198227e6421, 2016-12-16 (annotated)

Committer:
switches
Date:
Fri Dec 16 16:27:57 2016 +0000
Revision:
3:1198227e6421
Parent:
0:5c4d7b2438d3 
Changed ADC scale for MAX32625 platforms to 1.2V full scale to match MAX32630 platforms

Who changed what in which revision?

UserRevisionLine numberNew contents of line
switches 0:5c4d7b2438d3 1 /*
switches 0:5c4d7b2438d3 2 * HMAC_DRBG implementation (NIST SP 800-90)
switches 0:5c4d7b2438d3 3 *
switches 0:5c4d7b2438d3 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
switches 0:5c4d7b2438d3 5 * SPDX-License-Identifier: Apache-2.0
switches 0:5c4d7b2438d3 6 *
switches 0:5c4d7b2438d3 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
switches 0:5c4d7b2438d3 8 * not use this file except in compliance with the License.
switches 0:5c4d7b2438d3 9 * You may obtain a copy of the License at
switches 0:5c4d7b2438d3 10 *
switches 0:5c4d7b2438d3 11 * http://www.apache.org/licenses/LICENSE-2.0
switches 0:5c4d7b2438d3 12 *
switches 0:5c4d7b2438d3 13 * Unless required by applicable law or agreed to in writing, software
switches 0:5c4d7b2438d3 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
switches 0:5c4d7b2438d3 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
switches 0:5c4d7b2438d3 16 * See the License for the specific language governing permissions and
switches 0:5c4d7b2438d3 17 * limitations under the License.
switches 0:5c4d7b2438d3 18 *
switches 0:5c4d7b2438d3 19 * This file is part of mbed TLS (https://tls.mbed.org)
switches 0:5c4d7b2438d3 20 */
switches 0:5c4d7b2438d3 21
switches 0:5c4d7b2438d3 22 /*
switches 0:5c4d7b2438d3 23 * The NIST SP 800-90A DRBGs are described in the following publication.
switches 0:5c4d7b2438d3 24 * http://csrc.nist.gov/publications/nistpubs/800-90A/SP800-90A.pdf
switches 0:5c4d7b2438d3 25 * References below are based on rev. 1 (January 2012).
switches 0:5c4d7b2438d3 26 */
switches 0:5c4d7b2438d3 27
switches 0:5c4d7b2438d3 28 #if !defined(MBEDTLS_CONFIG_FILE)
switches 0:5c4d7b2438d3 29 #include "mbedtls/config.h"
switches 0:5c4d7b2438d3 30 #else
switches 0:5c4d7b2438d3 31 #include MBEDTLS_CONFIG_FILE
switches 0:5c4d7b2438d3 32 #endif
switches 0:5c4d7b2438d3 33
switches 0:5c4d7b2438d3 34 #if defined(MBEDTLS_HMAC_DRBG_C)
switches 0:5c4d7b2438d3 35
switches 0:5c4d7b2438d3 36 #include "mbedtls/hmac_drbg.h"
switches 0:5c4d7b2438d3 37
switches 0:5c4d7b2438d3 38 #include <string.h>
switches 0:5c4d7b2438d3 39
switches 0:5c4d7b2438d3 40 #if defined(MBEDTLS_FS_IO)
switches 0:5c4d7b2438d3 41 #include <stdio.h>
switches 0:5c4d7b2438d3 42 #endif
switches 0:5c4d7b2438d3 43
switches 0:5c4d7b2438d3 44 #if defined(MBEDTLS_SELF_TEST)
switches 0:5c4d7b2438d3 45 #if defined(MBEDTLS_PLATFORM_C)
switches 0:5c4d7b2438d3 46 #include "mbedtls/platform.h"
switches 0:5c4d7b2438d3 47 #else
switches 0:5c4d7b2438d3 48 #include <stdio.h>
switches 0:5c4d7b2438d3 49 #define mbedtls_printf printf
switches 0:5c4d7b2438d3 50 #endif /* MBEDTLS_SELF_TEST */
switches 0:5c4d7b2438d3 51 #endif /* MBEDTLS_PLATFORM_C */
switches 0:5c4d7b2438d3 52
switches 0:5c4d7b2438d3 53 /* Implementation that should never be optimized out by the compiler */
switches 0:5c4d7b2438d3 54 static void mbedtls_zeroize( void *v, size_t n ) {
switches 0:5c4d7b2438d3 55 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
switches 0:5c4d7b2438d3 56 }
switches 0:5c4d7b2438d3 57
switches 0:5c4d7b2438d3 58 /*
switches 0:5c4d7b2438d3 59 * HMAC_DRBG context initialization
switches 0:5c4d7b2438d3 60 */
switches 0:5c4d7b2438d3 61 void mbedtls_hmac_drbg_init( mbedtls_hmac_drbg_context *ctx )
switches 0:5c4d7b2438d3 62 {
switches 0:5c4d7b2438d3 63 memset( ctx, 0, sizeof( mbedtls_hmac_drbg_context ) );
switches 0:5c4d7b2438d3 64
switches 0:5c4d7b2438d3 65 #if defined(MBEDTLS_THREADING_C)
switches 0:5c4d7b2438d3 66 mbedtls_mutex_init( &ctx->mutex );
switches 0:5c4d7b2438d3 67 #endif
switches 0:5c4d7b2438d3 68 }
switches 0:5c4d7b2438d3 69
switches 0:5c4d7b2438d3 70 /*
switches 0:5c4d7b2438d3 71 * HMAC_DRBG update, using optional additional data (10.1.2.2)
switches 0:5c4d7b2438d3 72 */
switches 0:5c4d7b2438d3 73 void mbedtls_hmac_drbg_update( mbedtls_hmac_drbg_context *ctx,
switches 0:5c4d7b2438d3 74 const unsigned char *additional, size_t add_len )
switches 0:5c4d7b2438d3 75 {
switches 0:5c4d7b2438d3 76 size_t md_len = mbedtls_md_get_size( ctx->md_ctx.md_info );
switches 0:5c4d7b2438d3 77 unsigned char rounds = ( additional != NULL && add_len != 0 ) ? 2 : 1;
switches 0:5c4d7b2438d3 78 unsigned char sep[1];
switches 0:5c4d7b2438d3 79 unsigned char K[MBEDTLS_MD_MAX_SIZE];
switches 0:5c4d7b2438d3 80
switches 0:5c4d7b2438d3 81 for( sep[0] = 0; sep[0] < rounds; sep[0]++ )
switches 0:5c4d7b2438d3 82 {
switches 0:5c4d7b2438d3 83 /* Step 1 or 4 */
switches 0:5c4d7b2438d3 84 mbedtls_md_hmac_reset( &ctx->md_ctx );
switches 0:5c4d7b2438d3 85 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
switches 0:5c4d7b2438d3 86 mbedtls_md_hmac_update( &ctx->md_ctx, sep, 1 );
switches 0:5c4d7b2438d3 87 if( rounds == 2 )
switches 0:5c4d7b2438d3 88 mbedtls_md_hmac_update( &ctx->md_ctx, additional, add_len );
switches 0:5c4d7b2438d3 89 mbedtls_md_hmac_finish( &ctx->md_ctx, K );
switches 0:5c4d7b2438d3 90
switches 0:5c4d7b2438d3 91 /* Step 2 or 5 */
switches 0:5c4d7b2438d3 92 mbedtls_md_hmac_starts( &ctx->md_ctx, K, md_len );
switches 0:5c4d7b2438d3 93 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
switches 0:5c4d7b2438d3 94 mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V );
switches 0:5c4d7b2438d3 95 }
switches 0:5c4d7b2438d3 96 }
switches 0:5c4d7b2438d3 97
switches 0:5c4d7b2438d3 98 /*
switches 0:5c4d7b2438d3 99 * Simplified HMAC_DRBG initialisation (for use with deterministic ECDSA)
switches 0:5c4d7b2438d3 100 */
switches 0:5c4d7b2438d3 101 int mbedtls_hmac_drbg_seed_buf( mbedtls_hmac_drbg_context *ctx,
switches 0:5c4d7b2438d3 102 const mbedtls_md_info_t * md_info,
switches 0:5c4d7b2438d3 103 const unsigned char *data, size_t data_len )
switches 0:5c4d7b2438d3 104 {
switches 0:5c4d7b2438d3 105 int ret;
switches 0:5c4d7b2438d3 106
switches 0:5c4d7b2438d3 107 if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
switches 0:5c4d7b2438d3 108 return( ret );
switches 0:5c4d7b2438d3 109
switches 0:5c4d7b2438d3 110 /*
switches 0:5c4d7b2438d3 111 * Set initial working state.
switches 0:5c4d7b2438d3 112 * Use the V memory location, which is currently all 0, to initialize the
switches 0:5c4d7b2438d3 113 * MD context with an all-zero key. Then set V to its initial value.
switches 0:5c4d7b2438d3 114 */
switches 0:5c4d7b2438d3 115 mbedtls_md_hmac_starts( &ctx->md_ctx, ctx->V, mbedtls_md_get_size( md_info ) );
switches 0:5c4d7b2438d3 116 memset( ctx->V, 0x01, mbedtls_md_get_size( md_info ) );
switches 0:5c4d7b2438d3 117
switches 0:5c4d7b2438d3 118 mbedtls_hmac_drbg_update( ctx, data, data_len );
switches 0:5c4d7b2438d3 119
switches 0:5c4d7b2438d3 120 return( 0 );
switches 0:5c4d7b2438d3 121 }
switches 0:5c4d7b2438d3 122
switches 0:5c4d7b2438d3 123 /*
switches 0:5c4d7b2438d3 124 * HMAC_DRBG reseeding: 10.1.2.4 (arabic) + 9.2 (Roman)
switches 0:5c4d7b2438d3 125 */
switches 0:5c4d7b2438d3 126 int mbedtls_hmac_drbg_reseed( mbedtls_hmac_drbg_context *ctx,
switches 0:5c4d7b2438d3 127 const unsigned char *additional, size_t len )
switches 0:5c4d7b2438d3 128 {
switches 0:5c4d7b2438d3 129 unsigned char seed[MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT];
switches 0:5c4d7b2438d3 130 size_t seedlen;
switches 0:5c4d7b2438d3 131
switches 0:5c4d7b2438d3 132 /* III. Check input length */
switches 0:5c4d7b2438d3 133 if( len > MBEDTLS_HMAC_DRBG_MAX_INPUT ||
switches 0:5c4d7b2438d3 134 ctx->entropy_len + len > MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT )
switches 0:5c4d7b2438d3 135 {
switches 0:5c4d7b2438d3 136 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
switches 0:5c4d7b2438d3 137 }
switches 0:5c4d7b2438d3 138
switches 0:5c4d7b2438d3 139 memset( seed, 0, MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT );
switches 0:5c4d7b2438d3 140
switches 0:5c4d7b2438d3 141 /* IV. Gather entropy_len bytes of entropy for the seed */
switches 0:5c4d7b2438d3 142 if( ctx->f_entropy( ctx->p_entropy, seed, ctx->entropy_len ) != 0 )
switches 0:5c4d7b2438d3 143 return( MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED );
switches 0:5c4d7b2438d3 144
switches 0:5c4d7b2438d3 145 seedlen = ctx->entropy_len;
switches 0:5c4d7b2438d3 146
switches 0:5c4d7b2438d3 147 /* 1. Concatenate entropy and additional data if any */
switches 0:5c4d7b2438d3 148 if( additional != NULL && len != 0 )
switches 0:5c4d7b2438d3 149 {
switches 0:5c4d7b2438d3 150 memcpy( seed + seedlen, additional, len );
switches 0:5c4d7b2438d3 151 seedlen += len;
switches 0:5c4d7b2438d3 152 }
switches 0:5c4d7b2438d3 153
switches 0:5c4d7b2438d3 154 /* 2. Update state */
switches 0:5c4d7b2438d3 155 mbedtls_hmac_drbg_update( ctx, seed, seedlen );
switches 0:5c4d7b2438d3 156
switches 0:5c4d7b2438d3 157 /* 3. Reset reseed_counter */
switches 0:5c4d7b2438d3 158 ctx->reseed_counter = 1;
switches 0:5c4d7b2438d3 159
switches 0:5c4d7b2438d3 160 /* 4. Done */
switches 0:5c4d7b2438d3 161 return( 0 );
switches 0:5c4d7b2438d3 162 }
switches 0:5c4d7b2438d3 163
switches 0:5c4d7b2438d3 164 /*
switches 0:5c4d7b2438d3 165 * HMAC_DRBG initialisation (10.1.2.3 + 9.1)
switches 0:5c4d7b2438d3 166 */
switches 0:5c4d7b2438d3 167 int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
switches 0:5c4d7b2438d3 168 const mbedtls_md_info_t * md_info,
switches 0:5c4d7b2438d3 169 int (*f_entropy)(void *, unsigned char *, size_t),
switches 0:5c4d7b2438d3 170 void *p_entropy,
switches 0:5c4d7b2438d3 171 const unsigned char *custom,
switches 0:5c4d7b2438d3 172 size_t len )
switches 0:5c4d7b2438d3 173 {
switches 0:5c4d7b2438d3 174 int ret;
switches 0:5c4d7b2438d3 175 size_t entropy_len, md_size;
switches 0:5c4d7b2438d3 176
switches 0:5c4d7b2438d3 177 if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
switches 0:5c4d7b2438d3 178 return( ret );
switches 0:5c4d7b2438d3 179
switches 0:5c4d7b2438d3 180 md_size = mbedtls_md_get_size( md_info );
switches 0:5c4d7b2438d3 181
switches 0:5c4d7b2438d3 182 /*
switches 0:5c4d7b2438d3 183 * Set initial working state.
switches 0:5c4d7b2438d3 184 * Use the V memory location, which is currently all 0, to initialize the
switches 0:5c4d7b2438d3 185 * MD context with an all-zero key. Then set V to its initial value.
switches 0:5c4d7b2438d3 186 */
switches 0:5c4d7b2438d3 187 mbedtls_md_hmac_starts( &ctx->md_ctx, ctx->V, md_size );
switches 0:5c4d7b2438d3 188 memset( ctx->V, 0x01, md_size );
switches 0:5c4d7b2438d3 189
switches 0:5c4d7b2438d3 190 ctx->f_entropy = f_entropy;
switches 0:5c4d7b2438d3 191 ctx->p_entropy = p_entropy;
switches 0:5c4d7b2438d3 192
switches 0:5c4d7b2438d3 193 ctx->reseed_interval = MBEDTLS_HMAC_DRBG_RESEED_INTERVAL;
switches 0:5c4d7b2438d3 194
switches 0:5c4d7b2438d3 195 /*
switches 0:5c4d7b2438d3 196 * See SP800-57 5.6.1 (p. 65-66) for the security strength provided by
switches 0:5c4d7b2438d3 197 * each hash function, then according to SP800-90A rev1 10.1 table 2,
switches 0:5c4d7b2438d3 198 * min_entropy_len (in bits) is security_strength.
switches 0:5c4d7b2438d3 199 *
switches 0:5c4d7b2438d3 200 * (This also matches the sizes used in the NIST test vectors.)
switches 0:5c4d7b2438d3 201 */
switches 0:5c4d7b2438d3 202 entropy_len = md_size <= 20 ? 16 : /* 160-bits hash -> 128 bits */
switches 0:5c4d7b2438d3 203 md_size <= 28 ? 24 : /* 224-bits hash -> 192 bits */
switches 0:5c4d7b2438d3 204 32; /* better (256+) -> 256 bits */
switches 0:5c4d7b2438d3 205
switches 0:5c4d7b2438d3 206 /*
switches 0:5c4d7b2438d3 207 * For initialisation, use more entropy to emulate a nonce
switches 0:5c4d7b2438d3 208 * (Again, matches test vectors.)
switches 0:5c4d7b2438d3 209 */
switches 0:5c4d7b2438d3 210 ctx->entropy_len = entropy_len * 3 / 2;
switches 0:5c4d7b2438d3 211
switches 0:5c4d7b2438d3 212 if( ( ret = mbedtls_hmac_drbg_reseed( ctx, custom, len ) ) != 0 )
switches 0:5c4d7b2438d3 213 return( ret );
switches 0:5c4d7b2438d3 214
switches 0:5c4d7b2438d3 215 ctx->entropy_len = entropy_len;
switches 0:5c4d7b2438d3 216
switches 0:5c4d7b2438d3 217 return( 0 );
switches 0:5c4d7b2438d3 218 }
switches 0:5c4d7b2438d3 219
switches 0:5c4d7b2438d3 220 /*
switches 0:5c4d7b2438d3 221 * Set prediction resistance
switches 0:5c4d7b2438d3 222 */
switches 0:5c4d7b2438d3 223 void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx,
switches 0:5c4d7b2438d3 224 int resistance )
switches 0:5c4d7b2438d3 225 {
switches 0:5c4d7b2438d3 226 ctx->prediction_resistance = resistance;
switches 0:5c4d7b2438d3 227 }
switches 0:5c4d7b2438d3 228
switches 0:5c4d7b2438d3 229 /*
switches 0:5c4d7b2438d3 230 * Set entropy length grabbed for reseeds
switches 0:5c4d7b2438d3 231 */
switches 0:5c4d7b2438d3 232 void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx, size_t len )
switches 0:5c4d7b2438d3 233 {
switches 0:5c4d7b2438d3 234 ctx->entropy_len = len;
switches 0:5c4d7b2438d3 235 }
switches 0:5c4d7b2438d3 236
switches 0:5c4d7b2438d3 237 /*
switches 0:5c4d7b2438d3 238 * Set reseed interval
switches 0:5c4d7b2438d3 239 */
switches 0:5c4d7b2438d3 240 void mbedtls_hmac_drbg_set_reseed_interval( mbedtls_hmac_drbg_context *ctx, int interval )
switches 0:5c4d7b2438d3 241 {
switches 0:5c4d7b2438d3 242 ctx->reseed_interval = interval;
switches 0:5c4d7b2438d3 243 }
switches 0:5c4d7b2438d3 244
switches 0:5c4d7b2438d3 245 /*
switches 0:5c4d7b2438d3 246 * HMAC_DRBG random function with optional additional data:
switches 0:5c4d7b2438d3 247 * 10.1.2.5 (arabic) + 9.3 (Roman)
switches 0:5c4d7b2438d3 248 */
switches 0:5c4d7b2438d3 249 int mbedtls_hmac_drbg_random_with_add( void *p_rng,
switches 0:5c4d7b2438d3 250 unsigned char *output, size_t out_len,
switches 0:5c4d7b2438d3 251 const unsigned char *additional, size_t add_len )
switches 0:5c4d7b2438d3 252 {
switches 0:5c4d7b2438d3 253 int ret;
switches 0:5c4d7b2438d3 254 mbedtls_hmac_drbg_context *ctx = (mbedtls_hmac_drbg_context *) p_rng;
switches 0:5c4d7b2438d3 255 size_t md_len = mbedtls_md_get_size( ctx->md_ctx.md_info );
switches 0:5c4d7b2438d3 256 size_t left = out_len;
switches 0:5c4d7b2438d3 257 unsigned char *out = output;
switches 0:5c4d7b2438d3 258
switches 0:5c4d7b2438d3 259 /* II. Check request length */
switches 0:5c4d7b2438d3 260 if( out_len > MBEDTLS_HMAC_DRBG_MAX_REQUEST )
switches 0:5c4d7b2438d3 261 return( MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG );
switches 0:5c4d7b2438d3 262
switches 0:5c4d7b2438d3 263 /* III. Check input length */
switches 0:5c4d7b2438d3 264 if( add_len > MBEDTLS_HMAC_DRBG_MAX_INPUT )
switches 0:5c4d7b2438d3 265 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
switches 0:5c4d7b2438d3 266
switches 0:5c4d7b2438d3 267 /* 1. (aka VII and IX) Check reseed counter and PR */
switches 0:5c4d7b2438d3 268 if( ctx->f_entropy != NULL && /* For no-reseeding instances */
switches 0:5c4d7b2438d3 269 ( ctx->prediction_resistance == MBEDTLS_HMAC_DRBG_PR_ON ||
switches 0:5c4d7b2438d3 270 ctx->reseed_counter > ctx->reseed_interval ) )
switches 0:5c4d7b2438d3 271 {
switches 0:5c4d7b2438d3 272 if( ( ret = mbedtls_hmac_drbg_reseed( ctx, additional, add_len ) ) != 0 )
switches 0:5c4d7b2438d3 273 return( ret );
switches 0:5c4d7b2438d3 274
switches 0:5c4d7b2438d3 275 add_len = 0; /* VII.4 */
switches 0:5c4d7b2438d3 276 }
switches 0:5c4d7b2438d3 277
switches 0:5c4d7b2438d3 278 /* 2. Use additional data if any */
switches 0:5c4d7b2438d3 279 if( additional != NULL && add_len != 0 )
switches 0:5c4d7b2438d3 280 mbedtls_hmac_drbg_update( ctx, additional, add_len );
switches 0:5c4d7b2438d3 281
switches 0:5c4d7b2438d3 282 /* 3, 4, 5. Generate bytes */
switches 0:5c4d7b2438d3 283 while( left != 0 )
switches 0:5c4d7b2438d3 284 {
switches 0:5c4d7b2438d3 285 size_t use_len = left > md_len ? md_len : left;
switches 0:5c4d7b2438d3 286
switches 0:5c4d7b2438d3 287 mbedtls_md_hmac_reset( &ctx->md_ctx );
switches 0:5c4d7b2438d3 288 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
switches 0:5c4d7b2438d3 289 mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V );
switches 0:5c4d7b2438d3 290
switches 0:5c4d7b2438d3 291 memcpy( out, ctx->V, use_len );
switches 0:5c4d7b2438d3 292 out += use_len;
switches 0:5c4d7b2438d3 293 left -= use_len;
switches 0:5c4d7b2438d3 294 }
switches 0:5c4d7b2438d3 295
switches 0:5c4d7b2438d3 296 /* 6. Update */
switches 0:5c4d7b2438d3 297 mbedtls_hmac_drbg_update( ctx, additional, add_len );
switches 0:5c4d7b2438d3 298
switches 0:5c4d7b2438d3 299 /* 7. Update reseed counter */
switches 0:5c4d7b2438d3 300 ctx->reseed_counter++;
switches 0:5c4d7b2438d3 301
switches 0:5c4d7b2438d3 302 /* 8. Done */
switches 0:5c4d7b2438d3 303 return( 0 );
switches 0:5c4d7b2438d3 304 }
switches 0:5c4d7b2438d3 305
switches 0:5c4d7b2438d3 306 /*
switches 0:5c4d7b2438d3 307 * HMAC_DRBG random function
switches 0:5c4d7b2438d3 308 */
switches 0:5c4d7b2438d3 309 int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len )
switches 0:5c4d7b2438d3 310 {
switches 0:5c4d7b2438d3 311 int ret;
switches 0:5c4d7b2438d3 312 mbedtls_hmac_drbg_context *ctx = (mbedtls_hmac_drbg_context *) p_rng;
switches 0:5c4d7b2438d3 313
switches 0:5c4d7b2438d3 314 #if defined(MBEDTLS_THREADING_C)
switches 0:5c4d7b2438d3 315 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
switches 0:5c4d7b2438d3 316 return( ret );
switches 0:5c4d7b2438d3 317 #endif
switches 0:5c4d7b2438d3 318
switches 0:5c4d7b2438d3 319 ret = mbedtls_hmac_drbg_random_with_add( ctx, output, out_len, NULL, 0 );
switches 0:5c4d7b2438d3 320
switches 0:5c4d7b2438d3 321 #if defined(MBEDTLS_THREADING_C)
switches 0:5c4d7b2438d3 322 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
switches 0:5c4d7b2438d3 323 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
switches 0:5c4d7b2438d3 324 #endif
switches 0:5c4d7b2438d3 325
switches 0:5c4d7b2438d3 326 return( ret );
switches 0:5c4d7b2438d3 327 }
switches 0:5c4d7b2438d3 328
switches 0:5c4d7b2438d3 329 /*
switches 0:5c4d7b2438d3 330 * Free an HMAC_DRBG context
switches 0:5c4d7b2438d3 331 */
switches 0:5c4d7b2438d3 332 void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx )
switches 0:5c4d7b2438d3 333 {
switches 0:5c4d7b2438d3 334 if( ctx == NULL )
switches 0:5c4d7b2438d3 335 return;
switches 0:5c4d7b2438d3 336
switches 0:5c4d7b2438d3 337 #if defined(MBEDTLS_THREADING_C)
switches 0:5c4d7b2438d3 338 mbedtls_mutex_free( &ctx->mutex );
switches 0:5c4d7b2438d3 339 #endif
switches 0:5c4d7b2438d3 340 mbedtls_md_free( &ctx->md_ctx );
switches 0:5c4d7b2438d3 341 mbedtls_zeroize( ctx, sizeof( mbedtls_hmac_drbg_context ) );
switches 0:5c4d7b2438d3 342 }
switches 0:5c4d7b2438d3 343
switches 0:5c4d7b2438d3 344 #if defined(MBEDTLS_FS_IO)
switches 0:5c4d7b2438d3 345 int mbedtls_hmac_drbg_write_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
switches 0:5c4d7b2438d3 346 {
switches 0:5c4d7b2438d3 347 int ret;
switches 0:5c4d7b2438d3 348 FILE *f;
switches 0:5c4d7b2438d3 349 unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
switches 0:5c4d7b2438d3 350
switches 0:5c4d7b2438d3 351 if( ( f = fopen( path, "wb" ) ) == NULL )
switches 0:5c4d7b2438d3 352 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
switches 0:5c4d7b2438d3 353
switches 0:5c4d7b2438d3 354 if( ( ret = mbedtls_hmac_drbg_random( ctx, buf, sizeof( buf ) ) ) != 0 )
switches 0:5c4d7b2438d3 355 goto exit;
switches 0:5c4d7b2438d3 356
switches 0:5c4d7b2438d3 357 if( fwrite( buf, 1, sizeof( buf ), f ) != sizeof( buf ) )
switches 0:5c4d7b2438d3 358 {
switches 0:5c4d7b2438d3 359 ret = MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR;
switches 0:5c4d7b2438d3 360 goto exit;
switches 0:5c4d7b2438d3 361 }
switches 0:5c4d7b2438d3 362
switches 0:5c4d7b2438d3 363 ret = 0;
switches 0:5c4d7b2438d3 364
switches 0:5c4d7b2438d3 365 exit:
switches 0:5c4d7b2438d3 366 fclose( f );
switches 0:5c4d7b2438d3 367 return( ret );
switches 0:5c4d7b2438d3 368 }
switches 0:5c4d7b2438d3 369
switches 0:5c4d7b2438d3 370 int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
switches 0:5c4d7b2438d3 371 {
switches 0:5c4d7b2438d3 372 FILE *f;
switches 0:5c4d7b2438d3 373 size_t n;
switches 0:5c4d7b2438d3 374 unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
switches 0:5c4d7b2438d3 375
switches 0:5c4d7b2438d3 376 if( ( f = fopen( path, "rb" ) ) == NULL )
switches 0:5c4d7b2438d3 377 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
switches 0:5c4d7b2438d3 378
switches 0:5c4d7b2438d3 379 fseek( f, 0, SEEK_END );
switches 0:5c4d7b2438d3 380 n = (size_t) ftell( f );
switches 0:5c4d7b2438d3 381 fseek( f, 0, SEEK_SET );
switches 0:5c4d7b2438d3 382
switches 0:5c4d7b2438d3 383 if( n > MBEDTLS_HMAC_DRBG_MAX_INPUT )
switches 0:5c4d7b2438d3 384 {
switches 0:5c4d7b2438d3 385 fclose( f );
switches 0:5c4d7b2438d3 386 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
switches 0:5c4d7b2438d3 387 }
switches 0:5c4d7b2438d3 388
switches 0:5c4d7b2438d3 389 if( fread( buf, 1, n, f ) != n )
switches 0:5c4d7b2438d3 390 {
switches 0:5c4d7b2438d3 391 fclose( f );
switches 0:5c4d7b2438d3 392 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
switches 0:5c4d7b2438d3 393 }
switches 0:5c4d7b2438d3 394
switches 0:5c4d7b2438d3 395 fclose( f );
switches 0:5c4d7b2438d3 396
switches 0:5c4d7b2438d3 397 mbedtls_hmac_drbg_update( ctx, buf, n );
switches 0:5c4d7b2438d3 398
switches 0:5c4d7b2438d3 399 return( mbedtls_hmac_drbg_write_seed_file( ctx, path ) );
switches 0:5c4d7b2438d3 400 }
switches 0:5c4d7b2438d3 401 #endif /* MBEDTLS_FS_IO */
switches 0:5c4d7b2438d3 402
switches 0:5c4d7b2438d3 403
switches 0:5c4d7b2438d3 404 #if defined(MBEDTLS_SELF_TEST)
switches 0:5c4d7b2438d3 405
switches 0:5c4d7b2438d3 406 #if !defined(MBEDTLS_SHA1_C)
switches 0:5c4d7b2438d3 407 /* Dummy checkup routine */
switches 0:5c4d7b2438d3 408 int mbedtls_hmac_drbg_self_test( int verbose )
switches 0:5c4d7b2438d3 409 {
switches 0:5c4d7b2438d3 410 (void) verbose;
switches 0:5c4d7b2438d3 411 return( 0 );
switches 0:5c4d7b2438d3 412 }
switches 0:5c4d7b2438d3 413 #else
switches 0:5c4d7b2438d3 414
switches 0:5c4d7b2438d3 415 #define OUTPUT_LEN 80
switches 0:5c4d7b2438d3 416
switches 0:5c4d7b2438d3 417 /* From a NIST PR=true test vector */
switches 0:5c4d7b2438d3 418 static const unsigned char entropy_pr[] = {
switches 0:5c4d7b2438d3 419 0xa0, 0xc9, 0xab, 0x58, 0xf1, 0xe2, 0xe5, 0xa4, 0xde, 0x3e, 0xbd, 0x4f,
switches 0:5c4d7b2438d3 420 0xf7, 0x3e, 0x9c, 0x5b, 0x64, 0xef, 0xd8, 0xca, 0x02, 0x8c, 0xf8, 0x11,
switches 0:5c4d7b2438d3 421 0x48, 0xa5, 0x84, 0xfe, 0x69, 0xab, 0x5a, 0xee, 0x42, 0xaa, 0x4d, 0x42,
switches 0:5c4d7b2438d3 422 0x17, 0x60, 0x99, 0xd4, 0x5e, 0x13, 0x97, 0xdc, 0x40, 0x4d, 0x86, 0xa3,
switches 0:5c4d7b2438d3 423 0x7b, 0xf5, 0x59, 0x54, 0x75, 0x69, 0x51, 0xe4 };
switches 0:5c4d7b2438d3 424 static const unsigned char result_pr[OUTPUT_LEN] = {
switches 0:5c4d7b2438d3 425 0x9a, 0x00, 0xa2, 0xd0, 0x0e, 0xd5, 0x9b, 0xfe, 0x31, 0xec, 0xb1, 0x39,
switches 0:5c4d7b2438d3 426 0x9b, 0x60, 0x81, 0x48, 0xd1, 0x96, 0x9d, 0x25, 0x0d, 0x3c, 0x1e, 0x94,
switches 0:5c4d7b2438d3 427 0x10, 0x10, 0x98, 0x12, 0x93, 0x25, 0xca, 0xb8, 0xfc, 0xcc, 0x2d, 0x54,
switches 0:5c4d7b2438d3 428 0x73, 0x19, 0x70, 0xc0, 0x10, 0x7a, 0xa4, 0x89, 0x25, 0x19, 0x95, 0x5e,
switches 0:5c4d7b2438d3 429 0x4b, 0xc6, 0x00, 0x1d, 0x7f, 0x4e, 0x6a, 0x2b, 0xf8, 0xa3, 0x01, 0xab,
switches 0:5c4d7b2438d3 430 0x46, 0x05, 0x5c, 0x09, 0xa6, 0x71, 0x88, 0xf1, 0xa7, 0x40, 0xee, 0xf3,
switches 0:5c4d7b2438d3 431 0xe1, 0x5c, 0x02, 0x9b, 0x44, 0xaf, 0x03, 0x44 };
switches 0:5c4d7b2438d3 432
switches 0:5c4d7b2438d3 433 /* From a NIST PR=false test vector */
switches 0:5c4d7b2438d3 434 static const unsigned char entropy_nopr[] = {
switches 0:5c4d7b2438d3 435 0x79, 0x34, 0x9b, 0xbf, 0x7c, 0xdd, 0xa5, 0x79, 0x95, 0x57, 0x86, 0x66,
switches 0:5c4d7b2438d3 436 0x21, 0xc9, 0x13, 0x83, 0x11, 0x46, 0x73, 0x3a, 0xbf, 0x8c, 0x35, 0xc8,
switches 0:5c4d7b2438d3 437 0xc7, 0x21, 0x5b, 0x5b, 0x96, 0xc4, 0x8e, 0x9b, 0x33, 0x8c, 0x74, 0xe3,
switches 0:5c4d7b2438d3 438 0xe9, 0x9d, 0xfe, 0xdf };
switches 0:5c4d7b2438d3 439 static const unsigned char result_nopr[OUTPUT_LEN] = {
switches 0:5c4d7b2438d3 440 0xc6, 0xa1, 0x6a, 0xb8, 0xd4, 0x20, 0x70, 0x6f, 0x0f, 0x34, 0xab, 0x7f,
switches 0:5c4d7b2438d3 441 0xec, 0x5a, 0xdc, 0xa9, 0xd8, 0xca, 0x3a, 0x13, 0x3e, 0x15, 0x9c, 0xa6,
switches 0:5c4d7b2438d3 442 0xac, 0x43, 0xc6, 0xf8, 0xa2, 0xbe, 0x22, 0x83, 0x4a, 0x4c, 0x0a, 0x0a,
switches 0:5c4d7b2438d3 443 0xff, 0xb1, 0x0d, 0x71, 0x94, 0xf1, 0xc1, 0xa5, 0xcf, 0x73, 0x22, 0xec,
switches 0:5c4d7b2438d3 444 0x1a, 0xe0, 0x96, 0x4e, 0xd4, 0xbf, 0x12, 0x27, 0x46, 0xe0, 0x87, 0xfd,
switches 0:5c4d7b2438d3 445 0xb5, 0xb3, 0xe9, 0x1b, 0x34, 0x93, 0xd5, 0xbb, 0x98, 0xfa, 0xed, 0x49,
switches 0:5c4d7b2438d3 446 0xe8, 0x5f, 0x13, 0x0f, 0xc8, 0xa4, 0x59, 0xb7 };
switches 0:5c4d7b2438d3 447
switches 0:5c4d7b2438d3 448 /* "Entropy" from buffer */
switches 0:5c4d7b2438d3 449 static size_t test_offset;
switches 0:5c4d7b2438d3 450 static int hmac_drbg_self_test_entropy( void *data,
switches 0:5c4d7b2438d3 451 unsigned char *buf, size_t len )
switches 0:5c4d7b2438d3 452 {
switches 0:5c4d7b2438d3 453 const unsigned char *p = data;
switches 0:5c4d7b2438d3 454 memcpy( buf, p + test_offset, len );
switches 0:5c4d7b2438d3 455 test_offset += len;
switches 0:5c4d7b2438d3 456 return( 0 );
switches 0:5c4d7b2438d3 457 }
switches 0:5c4d7b2438d3 458
switches 0:5c4d7b2438d3 459 #define CHK( c ) if( (c) != 0 ) \
switches 0:5c4d7b2438d3 460 { \
switches 0:5c4d7b2438d3 461 if( verbose != 0 ) \
switches 0:5c4d7b2438d3 462 mbedtls_printf( "failed\n" ); \
switches 0:5c4d7b2438d3 463 return( 1 ); \
switches 0:5c4d7b2438d3 464 }
switches 0:5c4d7b2438d3 465
switches 0:5c4d7b2438d3 466 /*
switches 0:5c4d7b2438d3 467 * Checkup routine for HMAC_DRBG with SHA-1
switches 0:5c4d7b2438d3 468 */
switches 0:5c4d7b2438d3 469 int mbedtls_hmac_drbg_self_test( int verbose )
switches 0:5c4d7b2438d3 470 {
switches 0:5c4d7b2438d3 471 mbedtls_hmac_drbg_context ctx;
switches 0:5c4d7b2438d3 472 unsigned char buf[OUTPUT_LEN];
switches 0:5c4d7b2438d3 473 const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
switches 0:5c4d7b2438d3 474
switches 0:5c4d7b2438d3 475 mbedtls_hmac_drbg_init( &ctx );
switches 0:5c4d7b2438d3 476
switches 0:5c4d7b2438d3 477 /*
switches 0:5c4d7b2438d3 478 * PR = True
switches 0:5c4d7b2438d3 479 */
switches 0:5c4d7b2438d3 480 if( verbose != 0 )
switches 0:5c4d7b2438d3 481 mbedtls_printf( " HMAC_DRBG (PR = True) : " );
switches 0:5c4d7b2438d3 482
switches 0:5c4d7b2438d3 483 test_offset = 0;
switches 0:5c4d7b2438d3 484 CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
switches 0:5c4d7b2438d3 485 hmac_drbg_self_test_entropy, (void *) entropy_pr,
switches 0:5c4d7b2438d3 486 NULL, 0 ) );
switches 0:5c4d7b2438d3 487 mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
switches 0:5c4d7b2438d3 488 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
switches 0:5c4d7b2438d3 489 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
switches 0:5c4d7b2438d3 490 CHK( memcmp( buf, result_pr, OUTPUT_LEN ) );
switches 0:5c4d7b2438d3 491 mbedtls_hmac_drbg_free( &ctx );
switches 0:5c4d7b2438d3 492
switches 0:5c4d7b2438d3 493 mbedtls_hmac_drbg_free( &ctx );
switches 0:5c4d7b2438d3 494
switches 0:5c4d7b2438d3 495 if( verbose != 0 )
switches 0:5c4d7b2438d3 496 mbedtls_printf( "passed\n" );
switches 0:5c4d7b2438d3 497
switches 0:5c4d7b2438d3 498 /*
switches 0:5c4d7b2438d3 499 * PR = False
switches 0:5c4d7b2438d3 500 */
switches 0:5c4d7b2438d3 501 if( verbose != 0 )
switches 0:5c4d7b2438d3 502 mbedtls_printf( " HMAC_DRBG (PR = False) : " );
switches 0:5c4d7b2438d3 503
switches 0:5c4d7b2438d3 504 mbedtls_hmac_drbg_init( &ctx );
switches 0:5c4d7b2438d3 505
switches 0:5c4d7b2438d3 506 test_offset = 0;
switches 0:5c4d7b2438d3 507 CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
switches 0:5c4d7b2438d3 508 hmac_drbg_self_test_entropy, (void *) entropy_nopr,
switches 0:5c4d7b2438d3 509 NULL, 0 ) );
switches 0:5c4d7b2438d3 510 CHK( mbedtls_hmac_drbg_reseed( &ctx, NULL, 0 ) );
switches 0:5c4d7b2438d3 511 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
switches 0:5c4d7b2438d3 512 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
switches 0:5c4d7b2438d3 513 CHK( memcmp( buf, result_nopr, OUTPUT_LEN ) );
switches 0:5c4d7b2438d3 514 mbedtls_hmac_drbg_free( &ctx );
switches 0:5c4d7b2438d3 515
switches 0:5c4d7b2438d3 516 mbedtls_hmac_drbg_free( &ctx );
switches 0:5c4d7b2438d3 517
switches 0:5c4d7b2438d3 518 if( verbose != 0 )
switches 0:5c4d7b2438d3 519 mbedtls_printf( "passed\n" );
switches 0:5c4d7b2438d3 520
switches 0:5c4d7b2438d3 521 if( verbose != 0 )
switches 0:5c4d7b2438d3 522 mbedtls_printf( "\n" );
switches 0:5c4d7b2438d3 523
switches 0:5c4d7b2438d3 524 return( 0 );
switches 0:5c4d7b2438d3 525 }
switches 0:5c4d7b2438d3 526 #endif /* MBEDTLS_SHA1_C */
switches 0:5c4d7b2438d3 527 #endif /* MBEDTLS_SELF_TEST */
switches 0:5c4d7b2438d3 528
switches 0:5c4d7b2438d3 529 #endif /* MBEDTLS_HMAC_DRBG_C */