Nathen Gallardojohnson / WNCInterface

I added functionality to get the RSSI, BER, and Cell Neighbor for reporting connection issues to M2X

Dependencies:   WncControllerK64F

mbedtls/source/hmac_drbg.c@12:0071cb144c7a, 2016-11-01 (annotated)

Committer:
JMF
Date:
Tue Nov 01 14:22:56 2016 +0000
Revision:
12:0071cb144c7a
Adding mbedtls files

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JMF 12:0071cb144c7a 1 /*
JMF 12:0071cb144c7a 2 * HMAC_DRBG implementation (NIST SP 800-90)
JMF 12:0071cb144c7a 3 *
JMF 12:0071cb144c7a 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
JMF 12:0071cb144c7a 5 * SPDX-License-Identifier: Apache-2.0
JMF 12:0071cb144c7a 6 *
JMF 12:0071cb144c7a 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
JMF 12:0071cb144c7a 8 * not use this file except in compliance with the License.
JMF 12:0071cb144c7a 9 * You may obtain a copy of the License at
JMF 12:0071cb144c7a 10 *
JMF 12:0071cb144c7a 11 * http://www.apache.org/licenses/LICENSE-2.0
JMF 12:0071cb144c7a 12 *
JMF 12:0071cb144c7a 13 * Unless required by applicable law or agreed to in writing, software
JMF 12:0071cb144c7a 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
JMF 12:0071cb144c7a 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
JMF 12:0071cb144c7a 16 * See the License for the specific language governing permissions and
JMF 12:0071cb144c7a 17 * limitations under the License.
JMF 12:0071cb144c7a 18 *
JMF 12:0071cb144c7a 19 * This file is part of mbed TLS (https://tls.mbed.org)
JMF 12:0071cb144c7a 20 */
JMF 12:0071cb144c7a 21
JMF 12:0071cb144c7a 22 /*
JMF 12:0071cb144c7a 23 * The NIST SP 800-90A DRBGs are described in the following publication.
JMF 12:0071cb144c7a 24 * http://csrc.nist.gov/publications/nistpubs/800-90A/SP800-90A.pdf
JMF 12:0071cb144c7a 25 * References below are based on rev. 1 (January 2012).
JMF 12:0071cb144c7a 26 */
JMF 12:0071cb144c7a 27
JMF 12:0071cb144c7a 28 #if !defined(MBEDTLS_CONFIG_FILE)
JMF 12:0071cb144c7a 29 #include "mbedtls/config.h"
JMF 12:0071cb144c7a 30 #else
JMF 12:0071cb144c7a 31 #include MBEDTLS_CONFIG_FILE
JMF 12:0071cb144c7a 32 #endif
JMF 12:0071cb144c7a 33
JMF 12:0071cb144c7a 34 #if defined(MBEDTLS_HMAC_DRBG_C)
JMF 12:0071cb144c7a 35
JMF 12:0071cb144c7a 36 #include "mbedtls/hmac_drbg.h"
JMF 12:0071cb144c7a 37
JMF 12:0071cb144c7a 38 #include <string.h>
JMF 12:0071cb144c7a 39
JMF 12:0071cb144c7a 40 #if defined(MBEDTLS_FS_IO)
JMF 12:0071cb144c7a 41 #include <stdio.h>
JMF 12:0071cb144c7a 42 #endif
JMF 12:0071cb144c7a 43
JMF 12:0071cb144c7a 44 #if defined(MBEDTLS_SELF_TEST)
JMF 12:0071cb144c7a 45 #if defined(MBEDTLS_PLATFORM_C)
JMF 12:0071cb144c7a 46 #include "mbedtls/platform.h"
JMF 12:0071cb144c7a 47 #else
JMF 12:0071cb144c7a 48 #include <stdio.h>
JMF 12:0071cb144c7a 49 #define mbedtls_printf printf
JMF 12:0071cb144c7a 50 #endif /* MBEDTLS_SELF_TEST */
JMF 12:0071cb144c7a 51 #endif /* MBEDTLS_PLATFORM_C */
JMF 12:0071cb144c7a 52
JMF 12:0071cb144c7a 53 /* Implementation that should never be optimized out by the compiler */
JMF 12:0071cb144c7a 54 static void mbedtls_zeroize( void *v, size_t n ) {
JMF 12:0071cb144c7a 55 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
JMF 12:0071cb144c7a 56 }
JMF 12:0071cb144c7a 57
JMF 12:0071cb144c7a 58 /*
JMF 12:0071cb144c7a 59 * HMAC_DRBG context initialization
JMF 12:0071cb144c7a 60 */
JMF 12:0071cb144c7a 61 void mbedtls_hmac_drbg_init( mbedtls_hmac_drbg_context *ctx )
JMF 12:0071cb144c7a 62 {
JMF 12:0071cb144c7a 63 memset( ctx, 0, sizeof( mbedtls_hmac_drbg_context ) );
JMF 12:0071cb144c7a 64
JMF 12:0071cb144c7a 65 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 66 mbedtls_mutex_init( &ctx->mutex );
JMF 12:0071cb144c7a 67 #endif
JMF 12:0071cb144c7a 68 }
JMF 12:0071cb144c7a 69
JMF 12:0071cb144c7a 70 /*
JMF 12:0071cb144c7a 71 * HMAC_DRBG update, using optional additional data (10.1.2.2)
JMF 12:0071cb144c7a 72 */
JMF 12:0071cb144c7a 73 void mbedtls_hmac_drbg_update( mbedtls_hmac_drbg_context *ctx,
JMF 12:0071cb144c7a 74 const unsigned char *additional, size_t add_len )
JMF 12:0071cb144c7a 75 {
JMF 12:0071cb144c7a 76 size_t md_len = mbedtls_md_get_size( ctx->md_ctx.md_info );
JMF 12:0071cb144c7a 77 unsigned char rounds = ( additional != NULL && add_len != 0 ) ? 2 : 1;
JMF 12:0071cb144c7a 78 unsigned char sep[1];
JMF 12:0071cb144c7a 79 unsigned char K[MBEDTLS_MD_MAX_SIZE];
JMF 12:0071cb144c7a 80
JMF 12:0071cb144c7a 81 for( sep[0] = 0; sep[0] < rounds; sep[0]++ )
JMF 12:0071cb144c7a 82 {
JMF 12:0071cb144c7a 83 /* Step 1 or 4 */
JMF 12:0071cb144c7a 84 mbedtls_md_hmac_reset( &ctx->md_ctx );
JMF 12:0071cb144c7a 85 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
JMF 12:0071cb144c7a 86 mbedtls_md_hmac_update( &ctx->md_ctx, sep, 1 );
JMF 12:0071cb144c7a 87 if( rounds == 2 )
JMF 12:0071cb144c7a 88 mbedtls_md_hmac_update( &ctx->md_ctx, additional, add_len );
JMF 12:0071cb144c7a 89 mbedtls_md_hmac_finish( &ctx->md_ctx, K );
JMF 12:0071cb144c7a 90
JMF 12:0071cb144c7a 91 /* Step 2 or 5 */
JMF 12:0071cb144c7a 92 mbedtls_md_hmac_starts( &ctx->md_ctx, K, md_len );
JMF 12:0071cb144c7a 93 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
JMF 12:0071cb144c7a 94 mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V );
JMF 12:0071cb144c7a 95 }
JMF 12:0071cb144c7a 96 }
JMF 12:0071cb144c7a 97
JMF 12:0071cb144c7a 98 /*
JMF 12:0071cb144c7a 99 * Simplified HMAC_DRBG initialisation (for use with deterministic ECDSA)
JMF 12:0071cb144c7a 100 */
JMF 12:0071cb144c7a 101 int mbedtls_hmac_drbg_seed_buf( mbedtls_hmac_drbg_context *ctx,
JMF 12:0071cb144c7a 102 const mbedtls_md_info_t * md_info,
JMF 12:0071cb144c7a 103 const unsigned char *data, size_t data_len )
JMF 12:0071cb144c7a 104 {
JMF 12:0071cb144c7a 105 int ret;
JMF 12:0071cb144c7a 106
JMF 12:0071cb144c7a 107 if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
JMF 12:0071cb144c7a 108 return( ret );
JMF 12:0071cb144c7a 109
JMF 12:0071cb144c7a 110 /*
JMF 12:0071cb144c7a 111 * Set initial working state.
JMF 12:0071cb144c7a 112 * Use the V memory location, which is currently all 0, to initialize the
JMF 12:0071cb144c7a 113 * MD context with an all-zero key. Then set V to its initial value.
JMF 12:0071cb144c7a 114 */
JMF 12:0071cb144c7a 115 mbedtls_md_hmac_starts( &ctx->md_ctx, ctx->V, mbedtls_md_get_size( md_info ) );
JMF 12:0071cb144c7a 116 memset( ctx->V, 0x01, mbedtls_md_get_size( md_info ) );
JMF 12:0071cb144c7a 117
JMF 12:0071cb144c7a 118 mbedtls_hmac_drbg_update( ctx, data, data_len );
JMF 12:0071cb144c7a 119
JMF 12:0071cb144c7a 120 return( 0 );
JMF 12:0071cb144c7a 121 }
JMF 12:0071cb144c7a 122
JMF 12:0071cb144c7a 123 /*
JMF 12:0071cb144c7a 124 * HMAC_DRBG reseeding: 10.1.2.4 (arabic) + 9.2 (Roman)
JMF 12:0071cb144c7a 125 */
JMF 12:0071cb144c7a 126 int mbedtls_hmac_drbg_reseed( mbedtls_hmac_drbg_context *ctx,
JMF 12:0071cb144c7a 127 const unsigned char *additional, size_t len )
JMF 12:0071cb144c7a 128 {
JMF 12:0071cb144c7a 129 unsigned char seed[MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT];
JMF 12:0071cb144c7a 130 size_t seedlen;
JMF 12:0071cb144c7a 131
JMF 12:0071cb144c7a 132 /* III. Check input length */
JMF 12:0071cb144c7a 133 if( len > MBEDTLS_HMAC_DRBG_MAX_INPUT ||
JMF 12:0071cb144c7a 134 ctx->entropy_len + len > MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT )
JMF 12:0071cb144c7a 135 {
JMF 12:0071cb144c7a 136 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
JMF 12:0071cb144c7a 137 }
JMF 12:0071cb144c7a 138
JMF 12:0071cb144c7a 139 memset( seed, 0, MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT );
JMF 12:0071cb144c7a 140
JMF 12:0071cb144c7a 141 /* IV. Gather entropy_len bytes of entropy for the seed */
JMF 12:0071cb144c7a 142 if( ctx->f_entropy( ctx->p_entropy, seed, ctx->entropy_len ) != 0 )
JMF 12:0071cb144c7a 143 return( MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED );
JMF 12:0071cb144c7a 144
JMF 12:0071cb144c7a 145 seedlen = ctx->entropy_len;
JMF 12:0071cb144c7a 146
JMF 12:0071cb144c7a 147 /* 1. Concatenate entropy and additional data if any */
JMF 12:0071cb144c7a 148 if( additional != NULL && len != 0 )
JMF 12:0071cb144c7a 149 {
JMF 12:0071cb144c7a 150 memcpy( seed + seedlen, additional, len );
JMF 12:0071cb144c7a 151 seedlen += len;
JMF 12:0071cb144c7a 152 }
JMF 12:0071cb144c7a 153
JMF 12:0071cb144c7a 154 /* 2. Update state */
JMF 12:0071cb144c7a 155 mbedtls_hmac_drbg_update( ctx, seed, seedlen );
JMF 12:0071cb144c7a 156
JMF 12:0071cb144c7a 157 /* 3. Reset reseed_counter */
JMF 12:0071cb144c7a 158 ctx->reseed_counter = 1;
JMF 12:0071cb144c7a 159
JMF 12:0071cb144c7a 160 /* 4. Done */
JMF 12:0071cb144c7a 161 return( 0 );
JMF 12:0071cb144c7a 162 }
JMF 12:0071cb144c7a 163
JMF 12:0071cb144c7a 164 /*
JMF 12:0071cb144c7a 165 * HMAC_DRBG initialisation (10.1.2.3 + 9.1)
JMF 12:0071cb144c7a 166 */
JMF 12:0071cb144c7a 167 int mbedtls_hmac_drbg_seed( mbedtls_hmac_drbg_context *ctx,
JMF 12:0071cb144c7a 168 const mbedtls_md_info_t * md_info,
JMF 12:0071cb144c7a 169 int (*f_entropy)(void *, unsigned char *, size_t),
JMF 12:0071cb144c7a 170 void *p_entropy,
JMF 12:0071cb144c7a 171 const unsigned char *custom,
JMF 12:0071cb144c7a 172 size_t len )
JMF 12:0071cb144c7a 173 {
JMF 12:0071cb144c7a 174 int ret;
JMF 12:0071cb144c7a 175 size_t entropy_len, md_size;
JMF 12:0071cb144c7a 176
JMF 12:0071cb144c7a 177 if( ( ret = mbedtls_md_setup( &ctx->md_ctx, md_info, 1 ) ) != 0 )
JMF 12:0071cb144c7a 178 return( ret );
JMF 12:0071cb144c7a 179
JMF 12:0071cb144c7a 180 md_size = mbedtls_md_get_size( md_info );
JMF 12:0071cb144c7a 181
JMF 12:0071cb144c7a 182 /*
JMF 12:0071cb144c7a 183 * Set initial working state.
JMF 12:0071cb144c7a 184 * Use the V memory location, which is currently all 0, to initialize the
JMF 12:0071cb144c7a 185 * MD context with an all-zero key. Then set V to its initial value.
JMF 12:0071cb144c7a 186 */
JMF 12:0071cb144c7a 187 mbedtls_md_hmac_starts( &ctx->md_ctx, ctx->V, md_size );
JMF 12:0071cb144c7a 188 memset( ctx->V, 0x01, md_size );
JMF 12:0071cb144c7a 189
JMF 12:0071cb144c7a 190 ctx->f_entropy = f_entropy;
JMF 12:0071cb144c7a 191 ctx->p_entropy = p_entropy;
JMF 12:0071cb144c7a 192
JMF 12:0071cb144c7a 193 ctx->reseed_interval = MBEDTLS_HMAC_DRBG_RESEED_INTERVAL;
JMF 12:0071cb144c7a 194
JMF 12:0071cb144c7a 195 /*
JMF 12:0071cb144c7a 196 * See SP800-57 5.6.1 (p. 65-66) for the security strength provided by
JMF 12:0071cb144c7a 197 * each hash function, then according to SP800-90A rev1 10.1 table 2,
JMF 12:0071cb144c7a 198 * min_entropy_len (in bits) is security_strength.
JMF 12:0071cb144c7a 199 *
JMF 12:0071cb144c7a 200 * (This also matches the sizes used in the NIST test vectors.)
JMF 12:0071cb144c7a 201 */
JMF 12:0071cb144c7a 202 entropy_len = md_size <= 20 ? 16 : /* 160-bits hash -> 128 bits */
JMF 12:0071cb144c7a 203 md_size <= 28 ? 24 : /* 224-bits hash -> 192 bits */
JMF 12:0071cb144c7a 204 32; /* better (256+) -> 256 bits */
JMF 12:0071cb144c7a 205
JMF 12:0071cb144c7a 206 /*
JMF 12:0071cb144c7a 207 * For initialisation, use more entropy to emulate a nonce
JMF 12:0071cb144c7a 208 * (Again, matches test vectors.)
JMF 12:0071cb144c7a 209 */
JMF 12:0071cb144c7a 210 ctx->entropy_len = entropy_len * 3 / 2;
JMF 12:0071cb144c7a 211
JMF 12:0071cb144c7a 212 if( ( ret = mbedtls_hmac_drbg_reseed( ctx, custom, len ) ) != 0 )
JMF 12:0071cb144c7a 213 return( ret );
JMF 12:0071cb144c7a 214
JMF 12:0071cb144c7a 215 ctx->entropy_len = entropy_len;
JMF 12:0071cb144c7a 216
JMF 12:0071cb144c7a 217 return( 0 );
JMF 12:0071cb144c7a 218 }
JMF 12:0071cb144c7a 219
JMF 12:0071cb144c7a 220 /*
JMF 12:0071cb144c7a 221 * Set prediction resistance
JMF 12:0071cb144c7a 222 */
JMF 12:0071cb144c7a 223 void mbedtls_hmac_drbg_set_prediction_resistance( mbedtls_hmac_drbg_context *ctx,
JMF 12:0071cb144c7a 224 int resistance )
JMF 12:0071cb144c7a 225 {
JMF 12:0071cb144c7a 226 ctx->prediction_resistance = resistance;
JMF 12:0071cb144c7a 227 }
JMF 12:0071cb144c7a 228
JMF 12:0071cb144c7a 229 /*
JMF 12:0071cb144c7a 230 * Set entropy length grabbed for reseeds
JMF 12:0071cb144c7a 231 */
JMF 12:0071cb144c7a 232 void mbedtls_hmac_drbg_set_entropy_len( mbedtls_hmac_drbg_context *ctx, size_t len )
JMF 12:0071cb144c7a 233 {
JMF 12:0071cb144c7a 234 ctx->entropy_len = len;
JMF 12:0071cb144c7a 235 }
JMF 12:0071cb144c7a 236
JMF 12:0071cb144c7a 237 /*
JMF 12:0071cb144c7a 238 * Set reseed interval
JMF 12:0071cb144c7a 239 */
JMF 12:0071cb144c7a 240 void mbedtls_hmac_drbg_set_reseed_interval( mbedtls_hmac_drbg_context *ctx, int interval )
JMF 12:0071cb144c7a 241 {
JMF 12:0071cb144c7a 242 ctx->reseed_interval = interval;
JMF 12:0071cb144c7a 243 }
JMF 12:0071cb144c7a 244
JMF 12:0071cb144c7a 245 /*
JMF 12:0071cb144c7a 246 * HMAC_DRBG random function with optional additional data:
JMF 12:0071cb144c7a 247 * 10.1.2.5 (arabic) + 9.3 (Roman)
JMF 12:0071cb144c7a 248 */
JMF 12:0071cb144c7a 249 int mbedtls_hmac_drbg_random_with_add( void *p_rng,
JMF 12:0071cb144c7a 250 unsigned char *output, size_t out_len,
JMF 12:0071cb144c7a 251 const unsigned char *additional, size_t add_len )
JMF 12:0071cb144c7a 252 {
JMF 12:0071cb144c7a 253 int ret;
JMF 12:0071cb144c7a 254 mbedtls_hmac_drbg_context *ctx = (mbedtls_hmac_drbg_context *) p_rng;
JMF 12:0071cb144c7a 255 size_t md_len = mbedtls_md_get_size( ctx->md_ctx.md_info );
JMF 12:0071cb144c7a 256 size_t left = out_len;
JMF 12:0071cb144c7a 257 unsigned char *out = output;
JMF 12:0071cb144c7a 258
JMF 12:0071cb144c7a 259 /* II. Check request length */
JMF 12:0071cb144c7a 260 if( out_len > MBEDTLS_HMAC_DRBG_MAX_REQUEST )
JMF 12:0071cb144c7a 261 return( MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG );
JMF 12:0071cb144c7a 262
JMF 12:0071cb144c7a 263 /* III. Check input length */
JMF 12:0071cb144c7a 264 if( add_len > MBEDTLS_HMAC_DRBG_MAX_INPUT )
JMF 12:0071cb144c7a 265 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
JMF 12:0071cb144c7a 266
JMF 12:0071cb144c7a 267 /* 1. (aka VII and IX) Check reseed counter and PR */
JMF 12:0071cb144c7a 268 if( ctx->f_entropy != NULL && /* For no-reseeding instances */
JMF 12:0071cb144c7a 269 ( ctx->prediction_resistance == MBEDTLS_HMAC_DRBG_PR_ON ||
JMF 12:0071cb144c7a 270 ctx->reseed_counter > ctx->reseed_interval ) )
JMF 12:0071cb144c7a 271 {
JMF 12:0071cb144c7a 272 if( ( ret = mbedtls_hmac_drbg_reseed( ctx, additional, add_len ) ) != 0 )
JMF 12:0071cb144c7a 273 return( ret );
JMF 12:0071cb144c7a 274
JMF 12:0071cb144c7a 275 add_len = 0; /* VII.4 */
JMF 12:0071cb144c7a 276 }
JMF 12:0071cb144c7a 277
JMF 12:0071cb144c7a 278 /* 2. Use additional data if any */
JMF 12:0071cb144c7a 279 if( additional != NULL && add_len != 0 )
JMF 12:0071cb144c7a 280 mbedtls_hmac_drbg_update( ctx, additional, add_len );
JMF 12:0071cb144c7a 281
JMF 12:0071cb144c7a 282 /* 3, 4, 5. Generate bytes */
JMF 12:0071cb144c7a 283 while( left != 0 )
JMF 12:0071cb144c7a 284 {
JMF 12:0071cb144c7a 285 size_t use_len = left > md_len ? md_len : left;
JMF 12:0071cb144c7a 286
JMF 12:0071cb144c7a 287 mbedtls_md_hmac_reset( &ctx->md_ctx );
JMF 12:0071cb144c7a 288 mbedtls_md_hmac_update( &ctx->md_ctx, ctx->V, md_len );
JMF 12:0071cb144c7a 289 mbedtls_md_hmac_finish( &ctx->md_ctx, ctx->V );
JMF 12:0071cb144c7a 290
JMF 12:0071cb144c7a 291 memcpy( out, ctx->V, use_len );
JMF 12:0071cb144c7a 292 out += use_len;
JMF 12:0071cb144c7a 293 left -= use_len;
JMF 12:0071cb144c7a 294 }
JMF 12:0071cb144c7a 295
JMF 12:0071cb144c7a 296 /* 6. Update */
JMF 12:0071cb144c7a 297 mbedtls_hmac_drbg_update( ctx, additional, add_len );
JMF 12:0071cb144c7a 298
JMF 12:0071cb144c7a 299 /* 7. Update reseed counter */
JMF 12:0071cb144c7a 300 ctx->reseed_counter++;
JMF 12:0071cb144c7a 301
JMF 12:0071cb144c7a 302 /* 8. Done */
JMF 12:0071cb144c7a 303 return( 0 );
JMF 12:0071cb144c7a 304 }
JMF 12:0071cb144c7a 305
JMF 12:0071cb144c7a 306 /*
JMF 12:0071cb144c7a 307 * HMAC_DRBG random function
JMF 12:0071cb144c7a 308 */
JMF 12:0071cb144c7a 309 int mbedtls_hmac_drbg_random( void *p_rng, unsigned char *output, size_t out_len )
JMF 12:0071cb144c7a 310 {
JMF 12:0071cb144c7a 311 int ret;
JMF 12:0071cb144c7a 312 mbedtls_hmac_drbg_context *ctx = (mbedtls_hmac_drbg_context *) p_rng;
JMF 12:0071cb144c7a 313
JMF 12:0071cb144c7a 314 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 315 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
JMF 12:0071cb144c7a 316 return( ret );
JMF 12:0071cb144c7a 317 #endif
JMF 12:0071cb144c7a 318
JMF 12:0071cb144c7a 319 ret = mbedtls_hmac_drbg_random_with_add( ctx, output, out_len, NULL, 0 );
JMF 12:0071cb144c7a 320
JMF 12:0071cb144c7a 321 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 322 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
JMF 12:0071cb144c7a 323 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
JMF 12:0071cb144c7a 324 #endif
JMF 12:0071cb144c7a 325
JMF 12:0071cb144c7a 326 return( ret );
JMF 12:0071cb144c7a 327 }
JMF 12:0071cb144c7a 328
JMF 12:0071cb144c7a 329 /*
JMF 12:0071cb144c7a 330 * Free an HMAC_DRBG context
JMF 12:0071cb144c7a 331 */
JMF 12:0071cb144c7a 332 void mbedtls_hmac_drbg_free( mbedtls_hmac_drbg_context *ctx )
JMF 12:0071cb144c7a 333 {
JMF 12:0071cb144c7a 334 if( ctx == NULL )
JMF 12:0071cb144c7a 335 return;
JMF 12:0071cb144c7a 336
JMF 12:0071cb144c7a 337 #if defined(MBEDTLS_THREADING_C)
JMF 12:0071cb144c7a 338 mbedtls_mutex_free( &ctx->mutex );
JMF 12:0071cb144c7a 339 #endif
JMF 12:0071cb144c7a 340 mbedtls_md_free( &ctx->md_ctx );
JMF 12:0071cb144c7a 341 mbedtls_zeroize( ctx, sizeof( mbedtls_hmac_drbg_context ) );
JMF 12:0071cb144c7a 342 }
JMF 12:0071cb144c7a 343
JMF 12:0071cb144c7a 344 #if defined(MBEDTLS_FS_IO)
JMF 12:0071cb144c7a 345 int mbedtls_hmac_drbg_write_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
JMF 12:0071cb144c7a 346 {
JMF 12:0071cb144c7a 347 int ret;
JMF 12:0071cb144c7a 348 FILE *f;
JMF 12:0071cb144c7a 349 unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
JMF 12:0071cb144c7a 350
JMF 12:0071cb144c7a 351 if( ( f = fopen( path, "wb" ) ) == NULL )
JMF 12:0071cb144c7a 352 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
JMF 12:0071cb144c7a 353
JMF 12:0071cb144c7a 354 if( ( ret = mbedtls_hmac_drbg_random( ctx, buf, sizeof( buf ) ) ) != 0 )
JMF 12:0071cb144c7a 355 goto exit;
JMF 12:0071cb144c7a 356
JMF 12:0071cb144c7a 357 if( fwrite( buf, 1, sizeof( buf ), f ) != sizeof( buf ) )
JMF 12:0071cb144c7a 358 {
JMF 12:0071cb144c7a 359 ret = MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR;
JMF 12:0071cb144c7a 360 goto exit;
JMF 12:0071cb144c7a 361 }
JMF 12:0071cb144c7a 362
JMF 12:0071cb144c7a 363 ret = 0;
JMF 12:0071cb144c7a 364
JMF 12:0071cb144c7a 365 exit:
JMF 12:0071cb144c7a 366 fclose( f );
JMF 12:0071cb144c7a 367 return( ret );
JMF 12:0071cb144c7a 368 }
JMF 12:0071cb144c7a 369
JMF 12:0071cb144c7a 370 int mbedtls_hmac_drbg_update_seed_file( mbedtls_hmac_drbg_context *ctx, const char *path )
JMF 12:0071cb144c7a 371 {
JMF 12:0071cb144c7a 372 FILE *f;
JMF 12:0071cb144c7a 373 size_t n;
JMF 12:0071cb144c7a 374 unsigned char buf[ MBEDTLS_HMAC_DRBG_MAX_INPUT ];
JMF 12:0071cb144c7a 375
JMF 12:0071cb144c7a 376 if( ( f = fopen( path, "rb" ) ) == NULL )
JMF 12:0071cb144c7a 377 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
JMF 12:0071cb144c7a 378
JMF 12:0071cb144c7a 379 fseek( f, 0, SEEK_END );
JMF 12:0071cb144c7a 380 n = (size_t) ftell( f );
JMF 12:0071cb144c7a 381 fseek( f, 0, SEEK_SET );
JMF 12:0071cb144c7a 382
JMF 12:0071cb144c7a 383 if( n > MBEDTLS_HMAC_DRBG_MAX_INPUT )
JMF 12:0071cb144c7a 384 {
JMF 12:0071cb144c7a 385 fclose( f );
JMF 12:0071cb144c7a 386 return( MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG );
JMF 12:0071cb144c7a 387 }
JMF 12:0071cb144c7a 388
JMF 12:0071cb144c7a 389 if( fread( buf, 1, n, f ) != n )
JMF 12:0071cb144c7a 390 {
JMF 12:0071cb144c7a 391 fclose( f );
JMF 12:0071cb144c7a 392 return( MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR );
JMF 12:0071cb144c7a 393 }
JMF 12:0071cb144c7a 394
JMF 12:0071cb144c7a 395 fclose( f );
JMF 12:0071cb144c7a 396
JMF 12:0071cb144c7a 397 mbedtls_hmac_drbg_update( ctx, buf, n );
JMF 12:0071cb144c7a 398
JMF 12:0071cb144c7a 399 return( mbedtls_hmac_drbg_write_seed_file( ctx, path ) );
JMF 12:0071cb144c7a 400 }
JMF 12:0071cb144c7a 401 #endif /* MBEDTLS_FS_IO */
JMF 12:0071cb144c7a 402
JMF 12:0071cb144c7a 403
JMF 12:0071cb144c7a 404 #if defined(MBEDTLS_SELF_TEST)
JMF 12:0071cb144c7a 405
JMF 12:0071cb144c7a 406 #if !defined(MBEDTLS_SHA1_C)
JMF 12:0071cb144c7a 407 /* Dummy checkup routine */
JMF 12:0071cb144c7a 408 int mbedtls_hmac_drbg_self_test( int verbose )
JMF 12:0071cb144c7a 409 {
JMF 12:0071cb144c7a 410 (void) verbose;
JMF 12:0071cb144c7a 411 return( 0 );
JMF 12:0071cb144c7a 412 }
JMF 12:0071cb144c7a 413 #else
JMF 12:0071cb144c7a 414
JMF 12:0071cb144c7a 415 #define OUTPUT_LEN 80
JMF 12:0071cb144c7a 416
JMF 12:0071cb144c7a 417 /* From a NIST PR=true test vector */
JMF 12:0071cb144c7a 418 static const unsigned char entropy_pr[] = {
JMF 12:0071cb144c7a 419 0xa0, 0xc9, 0xab, 0x58, 0xf1, 0xe2, 0xe5, 0xa4, 0xde, 0x3e, 0xbd, 0x4f,
JMF 12:0071cb144c7a 420 0xf7, 0x3e, 0x9c, 0x5b, 0x64, 0xef, 0xd8, 0xca, 0x02, 0x8c, 0xf8, 0x11,
JMF 12:0071cb144c7a 421 0x48, 0xa5, 0x84, 0xfe, 0x69, 0xab, 0x5a, 0xee, 0x42, 0xaa, 0x4d, 0x42,
JMF 12:0071cb144c7a 422 0x17, 0x60, 0x99, 0xd4, 0x5e, 0x13, 0x97, 0xdc, 0x40, 0x4d, 0x86, 0xa3,
JMF 12:0071cb144c7a 423 0x7b, 0xf5, 0x59, 0x54, 0x75, 0x69, 0x51, 0xe4 };
JMF 12:0071cb144c7a 424 static const unsigned char result_pr[OUTPUT_LEN] = {
JMF 12:0071cb144c7a 425 0x9a, 0x00, 0xa2, 0xd0, 0x0e, 0xd5, 0x9b, 0xfe, 0x31, 0xec, 0xb1, 0x39,
JMF 12:0071cb144c7a 426 0x9b, 0x60, 0x81, 0x48, 0xd1, 0x96, 0x9d, 0x25, 0x0d, 0x3c, 0x1e, 0x94,
JMF 12:0071cb144c7a 427 0x10, 0x10, 0x98, 0x12, 0x93, 0x25, 0xca, 0xb8, 0xfc, 0xcc, 0x2d, 0x54,
JMF 12:0071cb144c7a 428 0x73, 0x19, 0x70, 0xc0, 0x10, 0x7a, 0xa4, 0x89, 0x25, 0x19, 0x95, 0x5e,
JMF 12:0071cb144c7a 429 0x4b, 0xc6, 0x00, 0x1d, 0x7f, 0x4e, 0x6a, 0x2b, 0xf8, 0xa3, 0x01, 0xab,
JMF 12:0071cb144c7a 430 0x46, 0x05, 0x5c, 0x09, 0xa6, 0x71, 0x88, 0xf1, 0xa7, 0x40, 0xee, 0xf3,
JMF 12:0071cb144c7a 431 0xe1, 0x5c, 0x02, 0x9b, 0x44, 0xaf, 0x03, 0x44 };
JMF 12:0071cb144c7a 432
JMF 12:0071cb144c7a 433 /* From a NIST PR=false test vector */
JMF 12:0071cb144c7a 434 static const unsigned char entropy_nopr[] = {
JMF 12:0071cb144c7a 435 0x79, 0x34, 0x9b, 0xbf, 0x7c, 0xdd, 0xa5, 0x79, 0x95, 0x57, 0x86, 0x66,
JMF 12:0071cb144c7a 436 0x21, 0xc9, 0x13, 0x83, 0x11, 0x46, 0x73, 0x3a, 0xbf, 0x8c, 0x35, 0xc8,
JMF 12:0071cb144c7a 437 0xc7, 0x21, 0x5b, 0x5b, 0x96, 0xc4, 0x8e, 0x9b, 0x33, 0x8c, 0x74, 0xe3,
JMF 12:0071cb144c7a 438 0xe9, 0x9d, 0xfe, 0xdf };
JMF 12:0071cb144c7a 439 static const unsigned char result_nopr[OUTPUT_LEN] = {
JMF 12:0071cb144c7a 440 0xc6, 0xa1, 0x6a, 0xb8, 0xd4, 0x20, 0x70, 0x6f, 0x0f, 0x34, 0xab, 0x7f,
JMF 12:0071cb144c7a 441 0xec, 0x5a, 0xdc, 0xa9, 0xd8, 0xca, 0x3a, 0x13, 0x3e, 0x15, 0x9c, 0xa6,
JMF 12:0071cb144c7a 442 0xac, 0x43, 0xc6, 0xf8, 0xa2, 0xbe, 0x22, 0x83, 0x4a, 0x4c, 0x0a, 0x0a,
JMF 12:0071cb144c7a 443 0xff, 0xb1, 0x0d, 0x71, 0x94, 0xf1, 0xc1, 0xa5, 0xcf, 0x73, 0x22, 0xec,
JMF 12:0071cb144c7a 444 0x1a, 0xe0, 0x96, 0x4e, 0xd4, 0xbf, 0x12, 0x27, 0x46, 0xe0, 0x87, 0xfd,
JMF 12:0071cb144c7a 445 0xb5, 0xb3, 0xe9, 0x1b, 0x34, 0x93, 0xd5, 0xbb, 0x98, 0xfa, 0xed, 0x49,
JMF 12:0071cb144c7a 446 0xe8, 0x5f, 0x13, 0x0f, 0xc8, 0xa4, 0x59, 0xb7 };
JMF 12:0071cb144c7a 447
JMF 12:0071cb144c7a 448 /* "Entropy" from buffer */
JMF 12:0071cb144c7a 449 static size_t test_offset;
JMF 12:0071cb144c7a 450 static int hmac_drbg_self_test_entropy( void *data,
JMF 12:0071cb144c7a 451 unsigned char *buf, size_t len )
JMF 12:0071cb144c7a 452 {
JMF 12:0071cb144c7a 453 const unsigned char *p = data;
JMF 12:0071cb144c7a 454 memcpy( buf, p + test_offset, len );
JMF 12:0071cb144c7a 455 test_offset += len;
JMF 12:0071cb144c7a 456 return( 0 );
JMF 12:0071cb144c7a 457 }
JMF 12:0071cb144c7a 458
JMF 12:0071cb144c7a 459 #define CHK( c ) if( (c) != 0 ) \
JMF 12:0071cb144c7a 460 { \
JMF 12:0071cb144c7a 461 if( verbose != 0 ) \
JMF 12:0071cb144c7a 462 mbedtls_printf( "failed\n" ); \
JMF 12:0071cb144c7a 463 return( 1 ); \
JMF 12:0071cb144c7a 464 }
JMF 12:0071cb144c7a 465
JMF 12:0071cb144c7a 466 /*
JMF 12:0071cb144c7a 467 * Checkup routine for HMAC_DRBG with SHA-1
JMF 12:0071cb144c7a 468 */
JMF 12:0071cb144c7a 469 int mbedtls_hmac_drbg_self_test( int verbose )
JMF 12:0071cb144c7a 470 {
JMF 12:0071cb144c7a 471 mbedtls_hmac_drbg_context ctx;
JMF 12:0071cb144c7a 472 unsigned char buf[OUTPUT_LEN];
JMF 12:0071cb144c7a 473 const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 );
JMF 12:0071cb144c7a 474
JMF 12:0071cb144c7a 475 mbedtls_hmac_drbg_init( &ctx );
JMF 12:0071cb144c7a 476
JMF 12:0071cb144c7a 477 /*
JMF 12:0071cb144c7a 478 * PR = True
JMF 12:0071cb144c7a 479 */
JMF 12:0071cb144c7a 480 if( verbose != 0 )
JMF 12:0071cb144c7a 481 mbedtls_printf( " HMAC_DRBG (PR = True) : " );
JMF 12:0071cb144c7a 482
JMF 12:0071cb144c7a 483 test_offset = 0;
JMF 12:0071cb144c7a 484 CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
JMF 12:0071cb144c7a 485 hmac_drbg_self_test_entropy, (void *) entropy_pr,
JMF 12:0071cb144c7a 486 NULL, 0 ) );
JMF 12:0071cb144c7a 487 mbedtls_hmac_drbg_set_prediction_resistance( &ctx, MBEDTLS_HMAC_DRBG_PR_ON );
JMF 12:0071cb144c7a 488 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
JMF 12:0071cb144c7a 489 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
JMF 12:0071cb144c7a 490 CHK( memcmp( buf, result_pr, OUTPUT_LEN ) );
JMF 12:0071cb144c7a 491 mbedtls_hmac_drbg_free( &ctx );
JMF 12:0071cb144c7a 492
JMF 12:0071cb144c7a 493 mbedtls_hmac_drbg_free( &ctx );
JMF 12:0071cb144c7a 494
JMF 12:0071cb144c7a 495 if( verbose != 0 )
JMF 12:0071cb144c7a 496 mbedtls_printf( "passed\n" );
JMF 12:0071cb144c7a 497
JMF 12:0071cb144c7a 498 /*
JMF 12:0071cb144c7a 499 * PR = False
JMF 12:0071cb144c7a 500 */
JMF 12:0071cb144c7a 501 if( verbose != 0 )
JMF 12:0071cb144c7a 502 mbedtls_printf( " HMAC_DRBG (PR = False) : " );
JMF 12:0071cb144c7a 503
JMF 12:0071cb144c7a 504 mbedtls_hmac_drbg_init( &ctx );
JMF 12:0071cb144c7a 505
JMF 12:0071cb144c7a 506 test_offset = 0;
JMF 12:0071cb144c7a 507 CHK( mbedtls_hmac_drbg_seed( &ctx, md_info,
JMF 12:0071cb144c7a 508 hmac_drbg_self_test_entropy, (void *) entropy_nopr,
JMF 12:0071cb144c7a 509 NULL, 0 ) );
JMF 12:0071cb144c7a 510 CHK( mbedtls_hmac_drbg_reseed( &ctx, NULL, 0 ) );
JMF 12:0071cb144c7a 511 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
JMF 12:0071cb144c7a 512 CHK( mbedtls_hmac_drbg_random( &ctx, buf, OUTPUT_LEN ) );
JMF 12:0071cb144c7a 513 CHK( memcmp( buf, result_nopr, OUTPUT_LEN ) );
JMF 12:0071cb144c7a 514 mbedtls_hmac_drbg_free( &ctx );
JMF 12:0071cb144c7a 515
JMF 12:0071cb144c7a 516 mbedtls_hmac_drbg_free( &ctx );
JMF 12:0071cb144c7a 517
JMF 12:0071cb144c7a 518 if( verbose != 0 )
JMF 12:0071cb144c7a 519 mbedtls_printf( "passed\n" );
JMF 12:0071cb144c7a 520
JMF 12:0071cb144c7a 521 if( verbose != 0 )
JMF 12:0071cb144c7a 522 mbedtls_printf( "\n" );
JMF 12:0071cb144c7a 523
JMF 12:0071cb144c7a 524 return( 0 );
JMF 12:0071cb144c7a 525 }
JMF 12:0071cb144c7a 526 #endif /* MBEDTLS_SHA1_C */
JMF 12:0071cb144c7a 527 #endif /* MBEDTLS_SELF_TEST */
JMF 12:0071cb144c7a 528
JMF 12:0071cb144c7a 529 #endif /* MBEDTLS_HMAC_DRBG_C */