EL4121 Embedded System / mbed-os

mbed-os

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

features/mbedtls/src/ctr_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 * CTR_DRBG implementation based on AES-256 (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 * The NIST SP 800-90 DRBGs are described in the following publucation.
be_bryan 0:b74591d5ab33 23 *
be_bryan 0:b74591d5ab33 24 * http://csrc.nist.gov/publications/nistpubs/800-90/SP800-90revised_March2007.pdf
be_bryan 0:b74591d5ab33 25 */
be_bryan 0:b74591d5ab33 26
be_bryan 0:b74591d5ab33 27 #if !defined(MBEDTLS_CONFIG_FILE)
be_bryan 0:b74591d5ab33 28 #include "mbedtls/config.h"
be_bryan 0:b74591d5ab33 29 #else
be_bryan 0:b74591d5ab33 30 #include MBEDTLS_CONFIG_FILE
be_bryan 0:b74591d5ab33 31 #endif
be_bryan 0:b74591d5ab33 32
be_bryan 0:b74591d5ab33 33 #if defined(MBEDTLS_CTR_DRBG_C)
be_bryan 0:b74591d5ab33 34
be_bryan 0:b74591d5ab33 35 #include "mbedtls/ctr_drbg.h"
be_bryan 0:b74591d5ab33 36
be_bryan 0:b74591d5ab33 37 #include <string.h>
be_bryan 0:b74591d5ab33 38
be_bryan 0:b74591d5ab33 39 #if defined(MBEDTLS_FS_IO)
be_bryan 0:b74591d5ab33 40 #include <stdio.h>
be_bryan 0:b74591d5ab33 41 #endif
be_bryan 0:b74591d5ab33 42
be_bryan 0:b74591d5ab33 43 #if defined(MBEDTLS_SELF_TEST)
be_bryan 0:b74591d5ab33 44 #if defined(MBEDTLS_PLATFORM_C)
be_bryan 0:b74591d5ab33 45 #include "mbedtls/platform.h"
be_bryan 0:b74591d5ab33 46 #else
be_bryan 0:b74591d5ab33 47 #include <stdio.h>
be_bryan 0:b74591d5ab33 48 #define mbedtls_printf printf
be_bryan 0:b74591d5ab33 49 #endif /* MBEDTLS_PLATFORM_C */
be_bryan 0:b74591d5ab33 50 #endif /* MBEDTLS_SELF_TEST */
be_bryan 0:b74591d5ab33 51
be_bryan 0:b74591d5ab33 52 /* Implementation that should never be optimized out by the compiler */
be_bryan 0:b74591d5ab33 53 static void mbedtls_zeroize( void *v, size_t n ) {
be_bryan 0:b74591d5ab33 54 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
be_bryan 0:b74591d5ab33 55 }
be_bryan 0:b74591d5ab33 56
be_bryan 0:b74591d5ab33 57 /*
be_bryan 0:b74591d5ab33 58 * CTR_DRBG context initialization
be_bryan 0:b74591d5ab33 59 */
be_bryan 0:b74591d5ab33 60 void mbedtls_ctr_drbg_init( mbedtls_ctr_drbg_context *ctx )
be_bryan 0:b74591d5ab33 61 {
be_bryan 0:b74591d5ab33 62 memset( ctx, 0, sizeof( mbedtls_ctr_drbg_context ) );
be_bryan 0:b74591d5ab33 63
be_bryan 0:b74591d5ab33 64 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 65 mbedtls_mutex_init( &ctx->mutex );
be_bryan 0:b74591d5ab33 66 #endif
be_bryan 0:b74591d5ab33 67 }
be_bryan 0:b74591d5ab33 68
be_bryan 0:b74591d5ab33 69 /*
be_bryan 0:b74591d5ab33 70 * Non-public function wrapped by mbedtls_ctr_drbg_seed(). Necessary to allow
be_bryan 0:b74591d5ab33 71 * NIST tests to succeed (which require known length fixed entropy)
be_bryan 0:b74591d5ab33 72 */
be_bryan 0:b74591d5ab33 73 int mbedtls_ctr_drbg_seed_entropy_len(
be_bryan 0:b74591d5ab33 74 mbedtls_ctr_drbg_context *ctx,
be_bryan 0:b74591d5ab33 75 int (*f_entropy)(void *, unsigned char *, size_t),
be_bryan 0:b74591d5ab33 76 void *p_entropy,
be_bryan 0:b74591d5ab33 77 const unsigned char *custom,
be_bryan 0:b74591d5ab33 78 size_t len,
be_bryan 0:b74591d5ab33 79 size_t entropy_len )
be_bryan 0:b74591d5ab33 80 {
be_bryan 0:b74591d5ab33 81 int ret;
be_bryan 0:b74591d5ab33 82 unsigned char key[MBEDTLS_CTR_DRBG_KEYSIZE];
be_bryan 0:b74591d5ab33 83
be_bryan 0:b74591d5ab33 84 memset( key, 0, MBEDTLS_CTR_DRBG_KEYSIZE );
be_bryan 0:b74591d5ab33 85
be_bryan 0:b74591d5ab33 86 mbedtls_aes_init( &ctx->aes_ctx );
be_bryan 0:b74591d5ab33 87
be_bryan 0:b74591d5ab33 88 ctx->f_entropy = f_entropy;
be_bryan 0:b74591d5ab33 89 ctx->p_entropy = p_entropy;
be_bryan 0:b74591d5ab33 90
be_bryan 0:b74591d5ab33 91 ctx->entropy_len = entropy_len;
be_bryan 0:b74591d5ab33 92 ctx->reseed_interval = MBEDTLS_CTR_DRBG_RESEED_INTERVAL;
be_bryan 0:b74591d5ab33 93
be_bryan 0:b74591d5ab33 94 /*
be_bryan 0:b74591d5ab33 95 * Initialize with an empty key
be_bryan 0:b74591d5ab33 96 */
be_bryan 0:b74591d5ab33 97 mbedtls_aes_setkey_enc( &ctx->aes_ctx, key, MBEDTLS_CTR_DRBG_KEYBITS );
be_bryan 0:b74591d5ab33 98
be_bryan 0:b74591d5ab33 99 if( ( ret = mbedtls_ctr_drbg_reseed( ctx, custom, len ) ) != 0 )
be_bryan 0:b74591d5ab33 100 return( ret );
be_bryan 0:b74591d5ab33 101
be_bryan 0:b74591d5ab33 102 return( 0 );
be_bryan 0:b74591d5ab33 103 }
be_bryan 0:b74591d5ab33 104
be_bryan 0:b74591d5ab33 105 int mbedtls_ctr_drbg_seed( mbedtls_ctr_drbg_context *ctx,
be_bryan 0:b74591d5ab33 106 int (*f_entropy)(void *, unsigned char *, size_t),
be_bryan 0:b74591d5ab33 107 void *p_entropy,
be_bryan 0:b74591d5ab33 108 const unsigned char *custom,
be_bryan 0:b74591d5ab33 109 size_t len )
be_bryan 0:b74591d5ab33 110 {
be_bryan 0:b74591d5ab33 111 return( mbedtls_ctr_drbg_seed_entropy_len( ctx, f_entropy, p_entropy, custom, len,
be_bryan 0:b74591d5ab33 112 MBEDTLS_CTR_DRBG_ENTROPY_LEN ) );
be_bryan 0:b74591d5ab33 113 }
be_bryan 0:b74591d5ab33 114
be_bryan 0:b74591d5ab33 115 void mbedtls_ctr_drbg_free( mbedtls_ctr_drbg_context *ctx )
be_bryan 0:b74591d5ab33 116 {
be_bryan 0:b74591d5ab33 117 if( ctx == NULL )
be_bryan 0:b74591d5ab33 118 return;
be_bryan 0:b74591d5ab33 119
be_bryan 0:b74591d5ab33 120 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 121 mbedtls_mutex_free( &ctx->mutex );
be_bryan 0:b74591d5ab33 122 #endif
be_bryan 0:b74591d5ab33 123 mbedtls_aes_free( &ctx->aes_ctx );
be_bryan 0:b74591d5ab33 124 mbedtls_zeroize( ctx, sizeof( mbedtls_ctr_drbg_context ) );
be_bryan 0:b74591d5ab33 125 }
be_bryan 0:b74591d5ab33 126
be_bryan 0:b74591d5ab33 127 void mbedtls_ctr_drbg_set_prediction_resistance( mbedtls_ctr_drbg_context *ctx, int resistance )
be_bryan 0:b74591d5ab33 128 {
be_bryan 0:b74591d5ab33 129 ctx->prediction_resistance = resistance;
be_bryan 0:b74591d5ab33 130 }
be_bryan 0:b74591d5ab33 131
be_bryan 0:b74591d5ab33 132 void mbedtls_ctr_drbg_set_entropy_len( mbedtls_ctr_drbg_context *ctx, size_t len )
be_bryan 0:b74591d5ab33 133 {
be_bryan 0:b74591d5ab33 134 ctx->entropy_len = len;
be_bryan 0:b74591d5ab33 135 }
be_bryan 0:b74591d5ab33 136
be_bryan 0:b74591d5ab33 137 void mbedtls_ctr_drbg_set_reseed_interval( mbedtls_ctr_drbg_context *ctx, int interval )
be_bryan 0:b74591d5ab33 138 {
be_bryan 0:b74591d5ab33 139 ctx->reseed_interval = interval;
be_bryan 0:b74591d5ab33 140 }
be_bryan 0:b74591d5ab33 141
be_bryan 0:b74591d5ab33 142 static int block_cipher_df( unsigned char *output,
be_bryan 0:b74591d5ab33 143 const unsigned char *data, size_t data_len )
be_bryan 0:b74591d5ab33 144 {
be_bryan 0:b74591d5ab33 145 unsigned char buf[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16];
be_bryan 0:b74591d5ab33 146 unsigned char tmp[MBEDTLS_CTR_DRBG_SEEDLEN];
be_bryan 0:b74591d5ab33 147 unsigned char key[MBEDTLS_CTR_DRBG_KEYSIZE];
be_bryan 0:b74591d5ab33 148 unsigned char chain[MBEDTLS_CTR_DRBG_BLOCKSIZE];
be_bryan 0:b74591d5ab33 149 unsigned char *p, *iv;
be_bryan 0:b74591d5ab33 150 mbedtls_aes_context aes_ctx;
be_bryan 0:b74591d5ab33 151
be_bryan 0:b74591d5ab33 152 int i, j;
be_bryan 0:b74591d5ab33 153 size_t buf_len, use_len;
be_bryan 0:b74591d5ab33 154
be_bryan 0:b74591d5ab33 155 if( data_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
be_bryan 0:b74591d5ab33 156 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
be_bryan 0:b74591d5ab33 157
be_bryan 0:b74591d5ab33 158 memset( buf, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16 );
be_bryan 0:b74591d5ab33 159 mbedtls_aes_init( &aes_ctx );
be_bryan 0:b74591d5ab33 160
be_bryan 0:b74591d5ab33 161 /*
be_bryan 0:b74591d5ab33 162 * Construct IV (16 bytes) and S in buffer
be_bryan 0:b74591d5ab33 163 * IV = Counter (in 32-bits) padded to 16 with zeroes
be_bryan 0:b74591d5ab33 164 * S = Length input string (in 32-bits) || Length of output (in 32-bits) ||
be_bryan 0:b74591d5ab33 165 * data || 0x80
be_bryan 0:b74591d5ab33 166 * (Total is padded to a multiple of 16-bytes with zeroes)
be_bryan 0:b74591d5ab33 167 */
be_bryan 0:b74591d5ab33 168 p = buf + MBEDTLS_CTR_DRBG_BLOCKSIZE;
be_bryan 0:b74591d5ab33 169 *p++ = ( data_len >> 24 ) & 0xff;
be_bryan 0:b74591d5ab33 170 *p++ = ( data_len >> 16 ) & 0xff;
be_bryan 0:b74591d5ab33 171 *p++ = ( data_len >> 8 ) & 0xff;
be_bryan 0:b74591d5ab33 172 *p++ = ( data_len ) & 0xff;
be_bryan 0:b74591d5ab33 173 p += 3;
be_bryan 0:b74591d5ab33 174 *p++ = MBEDTLS_CTR_DRBG_SEEDLEN;
be_bryan 0:b74591d5ab33 175 memcpy( p, data, data_len );
be_bryan 0:b74591d5ab33 176 p[data_len] = 0x80;
be_bryan 0:b74591d5ab33 177
be_bryan 0:b74591d5ab33 178 buf_len = MBEDTLS_CTR_DRBG_BLOCKSIZE + 8 + data_len + 1;
be_bryan 0:b74591d5ab33 179
be_bryan 0:b74591d5ab33 180 for( i = 0; i < MBEDTLS_CTR_DRBG_KEYSIZE; i++ )
be_bryan 0:b74591d5ab33 181 key[i] = i;
be_bryan 0:b74591d5ab33 182
be_bryan 0:b74591d5ab33 183 mbedtls_aes_setkey_enc( &aes_ctx, key, MBEDTLS_CTR_DRBG_KEYBITS );
be_bryan 0:b74591d5ab33 184
be_bryan 0:b74591d5ab33 185 /*
be_bryan 0:b74591d5ab33 186 * Reduce data to MBEDTLS_CTR_DRBG_SEEDLEN bytes of data
be_bryan 0:b74591d5ab33 187 */
be_bryan 0:b74591d5ab33 188 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
be_bryan 0:b74591d5ab33 189 {
be_bryan 0:b74591d5ab33 190 p = buf;
be_bryan 0:b74591d5ab33 191 memset( chain, 0, MBEDTLS_CTR_DRBG_BLOCKSIZE );
be_bryan 0:b74591d5ab33 192 use_len = buf_len;
be_bryan 0:b74591d5ab33 193
be_bryan 0:b74591d5ab33 194 while( use_len > 0 )
be_bryan 0:b74591d5ab33 195 {
be_bryan 0:b74591d5ab33 196 for( i = 0; i < MBEDTLS_CTR_DRBG_BLOCKSIZE; i++ )
be_bryan 0:b74591d5ab33 197 chain[i] ^= p[i];
be_bryan 0:b74591d5ab33 198 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
be_bryan 0:b74591d5ab33 199 use_len -= ( use_len >= MBEDTLS_CTR_DRBG_BLOCKSIZE ) ?
be_bryan 0:b74591d5ab33 200 MBEDTLS_CTR_DRBG_BLOCKSIZE : use_len;
be_bryan 0:b74591d5ab33 201
be_bryan 0:b74591d5ab33 202 mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, chain, chain );
be_bryan 0:b74591d5ab33 203 }
be_bryan 0:b74591d5ab33 204
be_bryan 0:b74591d5ab33 205 memcpy( tmp + j, chain, MBEDTLS_CTR_DRBG_BLOCKSIZE );
be_bryan 0:b74591d5ab33 206
be_bryan 0:b74591d5ab33 207 /*
be_bryan 0:b74591d5ab33 208 * Update IV
be_bryan 0:b74591d5ab33 209 */
be_bryan 0:b74591d5ab33 210 buf[3]++;
be_bryan 0:b74591d5ab33 211 }
be_bryan 0:b74591d5ab33 212
be_bryan 0:b74591d5ab33 213 /*
be_bryan 0:b74591d5ab33 214 * Do final encryption with reduced data
be_bryan 0:b74591d5ab33 215 */
be_bryan 0:b74591d5ab33 216 mbedtls_aes_setkey_enc( &aes_ctx, tmp, MBEDTLS_CTR_DRBG_KEYBITS );
be_bryan 0:b74591d5ab33 217 iv = tmp + MBEDTLS_CTR_DRBG_KEYSIZE;
be_bryan 0:b74591d5ab33 218 p = output;
be_bryan 0:b74591d5ab33 219
be_bryan 0:b74591d5ab33 220 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
be_bryan 0:b74591d5ab33 221 {
be_bryan 0:b74591d5ab33 222 mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, iv, iv );
be_bryan 0:b74591d5ab33 223 memcpy( p, iv, MBEDTLS_CTR_DRBG_BLOCKSIZE );
be_bryan 0:b74591d5ab33 224 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
be_bryan 0:b74591d5ab33 225 }
be_bryan 0:b74591d5ab33 226
be_bryan 0:b74591d5ab33 227 mbedtls_aes_free( &aes_ctx );
be_bryan 0:b74591d5ab33 228
be_bryan 0:b74591d5ab33 229 return( 0 );
be_bryan 0:b74591d5ab33 230 }
be_bryan 0:b74591d5ab33 231
be_bryan 0:b74591d5ab33 232 static int ctr_drbg_update_internal( mbedtls_ctr_drbg_context *ctx,
be_bryan 0:b74591d5ab33 233 const unsigned char data[MBEDTLS_CTR_DRBG_SEEDLEN] )
be_bryan 0:b74591d5ab33 234 {
be_bryan 0:b74591d5ab33 235 unsigned char tmp[MBEDTLS_CTR_DRBG_SEEDLEN];
be_bryan 0:b74591d5ab33 236 unsigned char *p = tmp;
be_bryan 0:b74591d5ab33 237 int i, j;
be_bryan 0:b74591d5ab33 238
be_bryan 0:b74591d5ab33 239 memset( tmp, 0, MBEDTLS_CTR_DRBG_SEEDLEN );
be_bryan 0:b74591d5ab33 240
be_bryan 0:b74591d5ab33 241 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
be_bryan 0:b74591d5ab33 242 {
be_bryan 0:b74591d5ab33 243 /*
be_bryan 0:b74591d5ab33 244 * Increase counter
be_bryan 0:b74591d5ab33 245 */
be_bryan 0:b74591d5ab33 246 for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- )
be_bryan 0:b74591d5ab33 247 if( ++ctx->counter[i - 1] != 0 )
be_bryan 0:b74591d5ab33 248 break;
be_bryan 0:b74591d5ab33 249
be_bryan 0:b74591d5ab33 250 /*
be_bryan 0:b74591d5ab33 251 * Crypt counter block
be_bryan 0:b74591d5ab33 252 */
be_bryan 0:b74591d5ab33 253 mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, ctx->counter, p );
be_bryan 0:b74591d5ab33 254
be_bryan 0:b74591d5ab33 255 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
be_bryan 0:b74591d5ab33 256 }
be_bryan 0:b74591d5ab33 257
be_bryan 0:b74591d5ab33 258 for( i = 0; i < MBEDTLS_CTR_DRBG_SEEDLEN; i++ )
be_bryan 0:b74591d5ab33 259 tmp[i] ^= data[i];
be_bryan 0:b74591d5ab33 260
be_bryan 0:b74591d5ab33 261 /*
be_bryan 0:b74591d5ab33 262 * Update key and counter
be_bryan 0:b74591d5ab33 263 */
be_bryan 0:b74591d5ab33 264 mbedtls_aes_setkey_enc( &ctx->aes_ctx, tmp, MBEDTLS_CTR_DRBG_KEYBITS );
be_bryan 0:b74591d5ab33 265 memcpy( ctx->counter, tmp + MBEDTLS_CTR_DRBG_KEYSIZE, MBEDTLS_CTR_DRBG_BLOCKSIZE );
be_bryan 0:b74591d5ab33 266
be_bryan 0:b74591d5ab33 267 return( 0 );
be_bryan 0:b74591d5ab33 268 }
be_bryan 0:b74591d5ab33 269
be_bryan 0:b74591d5ab33 270 void mbedtls_ctr_drbg_update( mbedtls_ctr_drbg_context *ctx,
be_bryan 0:b74591d5ab33 271 const unsigned char *additional, size_t add_len )
be_bryan 0:b74591d5ab33 272 {
be_bryan 0:b74591d5ab33 273 unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN];
be_bryan 0:b74591d5ab33 274
be_bryan 0:b74591d5ab33 275 if( add_len > 0 )
be_bryan 0:b74591d5ab33 276 {
be_bryan 0:b74591d5ab33 277 /* MAX_INPUT would be more logical here, but we have to match
be_bryan 0:b74591d5ab33 278 * block_cipher_df()'s limits since we can't propagate errors */
be_bryan 0:b74591d5ab33 279 if( add_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
be_bryan 0:b74591d5ab33 280 add_len = MBEDTLS_CTR_DRBG_MAX_SEED_INPUT;
be_bryan 0:b74591d5ab33 281
be_bryan 0:b74591d5ab33 282 block_cipher_df( add_input, additional, add_len );
be_bryan 0:b74591d5ab33 283 ctr_drbg_update_internal( ctx, add_input );
be_bryan 0:b74591d5ab33 284 }
be_bryan 0:b74591d5ab33 285 }
be_bryan 0:b74591d5ab33 286
be_bryan 0:b74591d5ab33 287 int mbedtls_ctr_drbg_reseed( mbedtls_ctr_drbg_context *ctx,
be_bryan 0:b74591d5ab33 288 const unsigned char *additional, size_t len )
be_bryan 0:b74591d5ab33 289 {
be_bryan 0:b74591d5ab33 290 unsigned char seed[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT];
be_bryan 0:b74591d5ab33 291 size_t seedlen = 0;
be_bryan 0:b74591d5ab33 292
be_bryan 0:b74591d5ab33 293 if( ctx->entropy_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT ||
be_bryan 0:b74591d5ab33 294 len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT - ctx->entropy_len )
be_bryan 0:b74591d5ab33 295 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
be_bryan 0:b74591d5ab33 296
be_bryan 0:b74591d5ab33 297 memset( seed, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT );
be_bryan 0:b74591d5ab33 298
be_bryan 0:b74591d5ab33 299 /*
be_bryan 0:b74591d5ab33 300 * Gather entropy_len bytes of entropy to seed state
be_bryan 0:b74591d5ab33 301 */
be_bryan 0:b74591d5ab33 302 if( 0 != ctx->f_entropy( ctx->p_entropy, seed,
be_bryan 0:b74591d5ab33 303 ctx->entropy_len ) )
be_bryan 0:b74591d5ab33 304 {
be_bryan 0:b74591d5ab33 305 return( MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED );
be_bryan 0:b74591d5ab33 306 }
be_bryan 0:b74591d5ab33 307
be_bryan 0:b74591d5ab33 308 seedlen += ctx->entropy_len;
be_bryan 0:b74591d5ab33 309
be_bryan 0:b74591d5ab33 310 /*
be_bryan 0:b74591d5ab33 311 * Add additional data
be_bryan 0:b74591d5ab33 312 */
be_bryan 0:b74591d5ab33 313 if( additional && len )
be_bryan 0:b74591d5ab33 314 {
be_bryan 0:b74591d5ab33 315 memcpy( seed + seedlen, additional, len );
be_bryan 0:b74591d5ab33 316 seedlen += len;
be_bryan 0:b74591d5ab33 317 }
be_bryan 0:b74591d5ab33 318
be_bryan 0:b74591d5ab33 319 /*
be_bryan 0:b74591d5ab33 320 * Reduce to 384 bits
be_bryan 0:b74591d5ab33 321 */
be_bryan 0:b74591d5ab33 322 block_cipher_df( seed, seed, seedlen );
be_bryan 0:b74591d5ab33 323
be_bryan 0:b74591d5ab33 324 /*
be_bryan 0:b74591d5ab33 325 * Update state
be_bryan 0:b74591d5ab33 326 */
be_bryan 0:b74591d5ab33 327 ctr_drbg_update_internal( ctx, seed );
be_bryan 0:b74591d5ab33 328 ctx->reseed_counter = 1;
be_bryan 0:b74591d5ab33 329
be_bryan 0:b74591d5ab33 330 return( 0 );
be_bryan 0:b74591d5ab33 331 }
be_bryan 0:b74591d5ab33 332
be_bryan 0:b74591d5ab33 333 int mbedtls_ctr_drbg_random_with_add( void *p_rng,
be_bryan 0:b74591d5ab33 334 unsigned char *output, size_t output_len,
be_bryan 0:b74591d5ab33 335 const unsigned char *additional, size_t add_len )
be_bryan 0:b74591d5ab33 336 {
be_bryan 0:b74591d5ab33 337 int ret = 0;
be_bryan 0:b74591d5ab33 338 mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng;
be_bryan 0:b74591d5ab33 339 unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN];
be_bryan 0:b74591d5ab33 340 unsigned char *p = output;
be_bryan 0:b74591d5ab33 341 unsigned char tmp[MBEDTLS_CTR_DRBG_BLOCKSIZE];
be_bryan 0:b74591d5ab33 342 int i;
be_bryan 0:b74591d5ab33 343 size_t use_len;
be_bryan 0:b74591d5ab33 344
be_bryan 0:b74591d5ab33 345 if( output_len > MBEDTLS_CTR_DRBG_MAX_REQUEST )
be_bryan 0:b74591d5ab33 346 return( MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG );
be_bryan 0:b74591d5ab33 347
be_bryan 0:b74591d5ab33 348 if( add_len > MBEDTLS_CTR_DRBG_MAX_INPUT )
be_bryan 0:b74591d5ab33 349 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
be_bryan 0:b74591d5ab33 350
be_bryan 0:b74591d5ab33 351 memset( add_input, 0, MBEDTLS_CTR_DRBG_SEEDLEN );
be_bryan 0:b74591d5ab33 352
be_bryan 0:b74591d5ab33 353 if( ctx->reseed_counter > ctx->reseed_interval ||
be_bryan 0:b74591d5ab33 354 ctx->prediction_resistance )
be_bryan 0:b74591d5ab33 355 {
be_bryan 0:b74591d5ab33 356 if( ( ret = mbedtls_ctr_drbg_reseed( ctx, additional, add_len ) ) != 0 )
be_bryan 0:b74591d5ab33 357 return( ret );
be_bryan 0:b74591d5ab33 358
be_bryan 0:b74591d5ab33 359 add_len = 0;
be_bryan 0:b74591d5ab33 360 }
be_bryan 0:b74591d5ab33 361
be_bryan 0:b74591d5ab33 362 if( add_len > 0 )
be_bryan 0:b74591d5ab33 363 {
be_bryan 0:b74591d5ab33 364 block_cipher_df( add_input, additional, add_len );
be_bryan 0:b74591d5ab33 365 ctr_drbg_update_internal( ctx, add_input );
be_bryan 0:b74591d5ab33 366 }
be_bryan 0:b74591d5ab33 367
be_bryan 0:b74591d5ab33 368 while( output_len > 0 )
be_bryan 0:b74591d5ab33 369 {
be_bryan 0:b74591d5ab33 370 /*
be_bryan 0:b74591d5ab33 371 * Increase counter
be_bryan 0:b74591d5ab33 372 */
be_bryan 0:b74591d5ab33 373 for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- )
be_bryan 0:b74591d5ab33 374 if( ++ctx->counter[i - 1] != 0 )
be_bryan 0:b74591d5ab33 375 break;
be_bryan 0:b74591d5ab33 376
be_bryan 0:b74591d5ab33 377 /*
be_bryan 0:b74591d5ab33 378 * Crypt counter block
be_bryan 0:b74591d5ab33 379 */
be_bryan 0:b74591d5ab33 380 mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, ctx->counter, tmp );
be_bryan 0:b74591d5ab33 381
be_bryan 0:b74591d5ab33 382 use_len = ( output_len > MBEDTLS_CTR_DRBG_BLOCKSIZE ) ? MBEDTLS_CTR_DRBG_BLOCKSIZE :
be_bryan 0:b74591d5ab33 383 output_len;
be_bryan 0:b74591d5ab33 384 /*
be_bryan 0:b74591d5ab33 385 * Copy random block to destination
be_bryan 0:b74591d5ab33 386 */
be_bryan 0:b74591d5ab33 387 memcpy( p, tmp, use_len );
be_bryan 0:b74591d5ab33 388 p += use_len;
be_bryan 0:b74591d5ab33 389 output_len -= use_len;
be_bryan 0:b74591d5ab33 390 }
be_bryan 0:b74591d5ab33 391
be_bryan 0:b74591d5ab33 392 ctr_drbg_update_internal( ctx, add_input );
be_bryan 0:b74591d5ab33 393
be_bryan 0:b74591d5ab33 394 ctx->reseed_counter++;
be_bryan 0:b74591d5ab33 395
be_bryan 0:b74591d5ab33 396 return( 0 );
be_bryan 0:b74591d5ab33 397 }
be_bryan 0:b74591d5ab33 398
be_bryan 0:b74591d5ab33 399 int mbedtls_ctr_drbg_random( void *p_rng, unsigned char *output, size_t output_len )
be_bryan 0:b74591d5ab33 400 {
be_bryan 0:b74591d5ab33 401 int ret;
be_bryan 0:b74591d5ab33 402 mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng;
be_bryan 0:b74591d5ab33 403
be_bryan 0:b74591d5ab33 404 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 405 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
be_bryan 0:b74591d5ab33 406 return( ret );
be_bryan 0:b74591d5ab33 407 #endif
be_bryan 0:b74591d5ab33 408
be_bryan 0:b74591d5ab33 409 ret = mbedtls_ctr_drbg_random_with_add( ctx, output, output_len, NULL, 0 );
be_bryan 0:b74591d5ab33 410
be_bryan 0:b74591d5ab33 411 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 412 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
be_bryan 0:b74591d5ab33 413 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
be_bryan 0:b74591d5ab33 414 #endif
be_bryan 0:b74591d5ab33 415
be_bryan 0:b74591d5ab33 416 return( ret );
be_bryan 0:b74591d5ab33 417 }
be_bryan 0:b74591d5ab33 418
be_bryan 0:b74591d5ab33 419 #if defined(MBEDTLS_FS_IO)
be_bryan 0:b74591d5ab33 420 int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path )
be_bryan 0:b74591d5ab33 421 {
be_bryan 0:b74591d5ab33 422 int ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR;
be_bryan 0:b74591d5ab33 423 FILE *f;
be_bryan 0:b74591d5ab33 424 unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ];
be_bryan 0:b74591d5ab33 425
be_bryan 0:b74591d5ab33 426 if( ( f = fopen( path, "wb" ) ) == NULL )
be_bryan 0:b74591d5ab33 427 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
be_bryan 0:b74591d5ab33 428
be_bryan 0:b74591d5ab33 429 if( ( ret = mbedtls_ctr_drbg_random( ctx, buf, MBEDTLS_CTR_DRBG_MAX_INPUT ) ) != 0 )
be_bryan 0:b74591d5ab33 430 goto exit;
be_bryan 0:b74591d5ab33 431
be_bryan 0:b74591d5ab33 432 if( fwrite( buf, 1, MBEDTLS_CTR_DRBG_MAX_INPUT, f ) != MBEDTLS_CTR_DRBG_MAX_INPUT )
be_bryan 0:b74591d5ab33 433 {
be_bryan 0:b74591d5ab33 434 ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR;
be_bryan 0:b74591d5ab33 435 goto exit;
be_bryan 0:b74591d5ab33 436 }
be_bryan 0:b74591d5ab33 437
be_bryan 0:b74591d5ab33 438 ret = 0;
be_bryan 0:b74591d5ab33 439
be_bryan 0:b74591d5ab33 440 exit:
be_bryan 0:b74591d5ab33 441 fclose( f );
be_bryan 0:b74591d5ab33 442 return( ret );
be_bryan 0:b74591d5ab33 443 }
be_bryan 0:b74591d5ab33 444
be_bryan 0:b74591d5ab33 445 int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path )
be_bryan 0:b74591d5ab33 446 {
be_bryan 0:b74591d5ab33 447 FILE *f;
be_bryan 0:b74591d5ab33 448 size_t n;
be_bryan 0:b74591d5ab33 449 unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ];
be_bryan 0:b74591d5ab33 450
be_bryan 0:b74591d5ab33 451 if( ( f = fopen( path, "rb" ) ) == NULL )
be_bryan 0:b74591d5ab33 452 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
be_bryan 0:b74591d5ab33 453
be_bryan 0:b74591d5ab33 454 fseek( f, 0, SEEK_END );
be_bryan 0:b74591d5ab33 455 n = (size_t) ftell( f );
be_bryan 0:b74591d5ab33 456 fseek( f, 0, SEEK_SET );
be_bryan 0:b74591d5ab33 457
be_bryan 0:b74591d5ab33 458 if( n > MBEDTLS_CTR_DRBG_MAX_INPUT )
be_bryan 0:b74591d5ab33 459 {
be_bryan 0:b74591d5ab33 460 fclose( f );
be_bryan 0:b74591d5ab33 461 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
be_bryan 0:b74591d5ab33 462 }
be_bryan 0:b74591d5ab33 463
be_bryan 0:b74591d5ab33 464 if( fread( buf, 1, n, f ) != n )
be_bryan 0:b74591d5ab33 465 {
be_bryan 0:b74591d5ab33 466 fclose( f );
be_bryan 0:b74591d5ab33 467 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
be_bryan 0:b74591d5ab33 468 }
be_bryan 0:b74591d5ab33 469
be_bryan 0:b74591d5ab33 470 fclose( f );
be_bryan 0:b74591d5ab33 471
be_bryan 0:b74591d5ab33 472 mbedtls_ctr_drbg_update( ctx, buf, n );
be_bryan 0:b74591d5ab33 473
be_bryan 0:b74591d5ab33 474 return( mbedtls_ctr_drbg_write_seed_file( ctx, path ) );
be_bryan 0:b74591d5ab33 475 }
be_bryan 0:b74591d5ab33 476 #endif /* MBEDTLS_FS_IO */
be_bryan 0:b74591d5ab33 477
be_bryan 0:b74591d5ab33 478 #if defined(MBEDTLS_SELF_TEST)
be_bryan 0:b74591d5ab33 479
be_bryan 0:b74591d5ab33 480 static const unsigned char entropy_source_pr[96] =
be_bryan 0:b74591d5ab33 481 { 0xc1, 0x80, 0x81, 0xa6, 0x5d, 0x44, 0x02, 0x16,
be_bryan 0:b74591d5ab33 482 0x19, 0xb3, 0xf1, 0x80, 0xb1, 0xc9, 0x20, 0x02,
be_bryan 0:b74591d5ab33 483 0x6a, 0x54, 0x6f, 0x0c, 0x70, 0x81, 0x49, 0x8b,
be_bryan 0:b74591d5ab33 484 0x6e, 0xa6, 0x62, 0x52, 0x6d, 0x51, 0xb1, 0xcb,
be_bryan 0:b74591d5ab33 485 0x58, 0x3b, 0xfa, 0xd5, 0x37, 0x5f, 0xfb, 0xc9,
be_bryan 0:b74591d5ab33 486 0xff, 0x46, 0xd2, 0x19, 0xc7, 0x22, 0x3e, 0x95,
be_bryan 0:b74591d5ab33 487 0x45, 0x9d, 0x82, 0xe1, 0xe7, 0x22, 0x9f, 0x63,
be_bryan 0:b74591d5ab33 488 0x31, 0x69, 0xd2, 0x6b, 0x57, 0x47, 0x4f, 0xa3,
be_bryan 0:b74591d5ab33 489 0x37, 0xc9, 0x98, 0x1c, 0x0b, 0xfb, 0x91, 0x31,
be_bryan 0:b74591d5ab33 490 0x4d, 0x55, 0xb9, 0xe9, 0x1c, 0x5a, 0x5e, 0xe4,
be_bryan 0:b74591d5ab33 491 0x93, 0x92, 0xcf, 0xc5, 0x23, 0x12, 0xd5, 0x56,
be_bryan 0:b74591d5ab33 492 0x2c, 0x4a, 0x6e, 0xff, 0xdc, 0x10, 0xd0, 0x68 };
be_bryan 0:b74591d5ab33 493
be_bryan 0:b74591d5ab33 494 static const unsigned char entropy_source_nopr[64] =
be_bryan 0:b74591d5ab33 495 { 0x5a, 0x19, 0x4d, 0x5e, 0x2b, 0x31, 0x58, 0x14,
be_bryan 0:b74591d5ab33 496 0x54, 0xde, 0xf6, 0x75, 0xfb, 0x79, 0x58, 0xfe,
be_bryan 0:b74591d5ab33 497 0xc7, 0xdb, 0x87, 0x3e, 0x56, 0x89, 0xfc, 0x9d,
be_bryan 0:b74591d5ab33 498 0x03, 0x21, 0x7c, 0x68, 0xd8, 0x03, 0x38, 0x20,
be_bryan 0:b74591d5ab33 499 0xf9, 0xe6, 0x5e, 0x04, 0xd8, 0x56, 0xf3, 0xa9,
be_bryan 0:b74591d5ab33 500 0xc4, 0x4a, 0x4c, 0xbd, 0xc1, 0xd0, 0x08, 0x46,
be_bryan 0:b74591d5ab33 501 0xf5, 0x98, 0x3d, 0x77, 0x1c, 0x1b, 0x13, 0x7e,
be_bryan 0:b74591d5ab33 502 0x4e, 0x0f, 0x9d, 0x8e, 0xf4, 0x09, 0xf9, 0x2e };
be_bryan 0:b74591d5ab33 503
be_bryan 0:b74591d5ab33 504 static const unsigned char nonce_pers_pr[16] =
be_bryan 0:b74591d5ab33 505 { 0xd2, 0x54, 0xfc, 0xff, 0x02, 0x1e, 0x69, 0xd2,
be_bryan 0:b74591d5ab33 506 0x29, 0xc9, 0xcf, 0xad, 0x85, 0xfa, 0x48, 0x6c };
be_bryan 0:b74591d5ab33 507
be_bryan 0:b74591d5ab33 508 static const unsigned char nonce_pers_nopr[16] =
be_bryan 0:b74591d5ab33 509 { 0x1b, 0x54, 0xb8, 0xff, 0x06, 0x42, 0xbf, 0xf5,
be_bryan 0:b74591d5ab33 510 0x21, 0xf1, 0x5c, 0x1c, 0x0b, 0x66, 0x5f, 0x3f };
be_bryan 0:b74591d5ab33 511
be_bryan 0:b74591d5ab33 512 static const unsigned char result_pr[16] =
be_bryan 0:b74591d5ab33 513 { 0x34, 0x01, 0x16, 0x56, 0xb4, 0x29, 0x00, 0x8f,
be_bryan 0:b74591d5ab33 514 0x35, 0x63, 0xec, 0xb5, 0xf2, 0x59, 0x07, 0x23 };
be_bryan 0:b74591d5ab33 515
be_bryan 0:b74591d5ab33 516 static const unsigned char result_nopr[16] =
be_bryan 0:b74591d5ab33 517 { 0xa0, 0x54, 0x30, 0x3d, 0x8a, 0x7e, 0xa9, 0x88,
be_bryan 0:b74591d5ab33 518 0x9d, 0x90, 0x3e, 0x07, 0x7c, 0x6f, 0x21, 0x8f };
be_bryan 0:b74591d5ab33 519
be_bryan 0:b74591d5ab33 520 static size_t test_offset;
be_bryan 0:b74591d5ab33 521 static int ctr_drbg_self_test_entropy( void *data, unsigned char *buf,
be_bryan 0:b74591d5ab33 522 size_t len )
be_bryan 0:b74591d5ab33 523 {
be_bryan 0:b74591d5ab33 524 const unsigned char *p = data;
be_bryan 0:b74591d5ab33 525 memcpy( buf, p + test_offset, len );
be_bryan 0:b74591d5ab33 526 test_offset += len;
be_bryan 0:b74591d5ab33 527 return( 0 );
be_bryan 0:b74591d5ab33 528 }
be_bryan 0:b74591d5ab33 529
be_bryan 0:b74591d5ab33 530 #define CHK( c ) if( (c) != 0 ) \
be_bryan 0:b74591d5ab33 531 { \
be_bryan 0:b74591d5ab33 532 if( verbose != 0 ) \
be_bryan 0:b74591d5ab33 533 mbedtls_printf( "failed\n" ); \
be_bryan 0:b74591d5ab33 534 return( 1 ); \
be_bryan 0:b74591d5ab33 535 }
be_bryan 0:b74591d5ab33 536
be_bryan 0:b74591d5ab33 537 /*
be_bryan 0:b74591d5ab33 538 * Checkup routine
be_bryan 0:b74591d5ab33 539 */
be_bryan 0:b74591d5ab33 540 int mbedtls_ctr_drbg_self_test( int verbose )
be_bryan 0:b74591d5ab33 541 {
be_bryan 0:b74591d5ab33 542 mbedtls_ctr_drbg_context ctx;
be_bryan 0:b74591d5ab33 543 unsigned char buf[16];
be_bryan 0:b74591d5ab33 544
be_bryan 0:b74591d5ab33 545 mbedtls_ctr_drbg_init( &ctx );
be_bryan 0:b74591d5ab33 546
be_bryan 0:b74591d5ab33 547 /*
be_bryan 0:b74591d5ab33 548 * Based on a NIST CTR_DRBG test vector (PR = True)
be_bryan 0:b74591d5ab33 549 */
be_bryan 0:b74591d5ab33 550 if( verbose != 0 )
be_bryan 0:b74591d5ab33 551 mbedtls_printf( " CTR_DRBG (PR = TRUE) : " );
be_bryan 0:b74591d5ab33 552
be_bryan 0:b74591d5ab33 553 test_offset = 0;
be_bryan 0:b74591d5ab33 554 CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy,
be_bryan 0:b74591d5ab33 555 (void *) entropy_source_pr, nonce_pers_pr, 16, 32 ) );
be_bryan 0:b74591d5ab33 556 mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
be_bryan 0:b74591d5ab33 557 CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
be_bryan 0:b74591d5ab33 558 CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
be_bryan 0:b74591d5ab33 559 CHK( memcmp( buf, result_pr, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
be_bryan 0:b74591d5ab33 560
be_bryan 0:b74591d5ab33 561 mbedtls_ctr_drbg_free( &ctx );
be_bryan 0:b74591d5ab33 562
be_bryan 0:b74591d5ab33 563 if( verbose != 0 )
be_bryan 0:b74591d5ab33 564 mbedtls_printf( "passed\n" );
be_bryan 0:b74591d5ab33 565
be_bryan 0:b74591d5ab33 566 /*
be_bryan 0:b74591d5ab33 567 * Based on a NIST CTR_DRBG test vector (PR = FALSE)
be_bryan 0:b74591d5ab33 568 */
be_bryan 0:b74591d5ab33 569 if( verbose != 0 )
be_bryan 0:b74591d5ab33 570 mbedtls_printf( " CTR_DRBG (PR = FALSE): " );
be_bryan 0:b74591d5ab33 571
be_bryan 0:b74591d5ab33 572 mbedtls_ctr_drbg_init( &ctx );
be_bryan 0:b74591d5ab33 573
be_bryan 0:b74591d5ab33 574 test_offset = 0;
be_bryan 0:b74591d5ab33 575 CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy,
be_bryan 0:b74591d5ab33 576 (void *) entropy_source_nopr, nonce_pers_nopr, 16, 32 ) );
be_bryan 0:b74591d5ab33 577 CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) );
be_bryan 0:b74591d5ab33 578 CHK( mbedtls_ctr_drbg_reseed( &ctx, NULL, 0 ) );
be_bryan 0:b74591d5ab33 579 CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) );
be_bryan 0:b74591d5ab33 580 CHK( memcmp( buf, result_nopr, 16 ) );
be_bryan 0:b74591d5ab33 581
be_bryan 0:b74591d5ab33 582 mbedtls_ctr_drbg_free( &ctx );
be_bryan 0:b74591d5ab33 583
be_bryan 0:b74591d5ab33 584 if( verbose != 0 )
be_bryan 0:b74591d5ab33 585 mbedtls_printf( "passed\n" );
be_bryan 0:b74591d5ab33 586
be_bryan 0:b74591d5ab33 587 if( verbose != 0 )
be_bryan 0:b74591d5ab33 588 mbedtls_printf( "\n" );
be_bryan 0:b74591d5ab33 589
be_bryan 0:b74591d5ab33 590 return( 0 );
be_bryan 0:b74591d5ab33 591 }
be_bryan 0:b74591d5ab33 592 #endif /* MBEDTLS_SELF_TEST */
be_bryan 0:b74591d5ab33 593
be_bryan 0:b74591d5ab33 594 #endif /* MBEDTLS_CTR_DRBG_C */