Maxim nexpaq / nexpaq_dev

Preliminary main mbed library for nexpaq development

features/mbedtls/src/ctr_drbg.c@0:6c56fb4bc5f0, 2016-11-04 (annotated)

Committer:
nexpaq
Date:
Fri Nov 04 20:27:58 2016 +0000
Revision:
0:6c56fb4bc5f0
Moving to library for sharing updates

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nexpaq 0:6c56fb4bc5f0 1 /*
nexpaq 0:6c56fb4bc5f0 2 * CTR_DRBG implementation based on AES-256 (NIST SP 800-90)
nexpaq 0:6c56fb4bc5f0 3 *
nexpaq 0:6c56fb4bc5f0 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
nexpaq 0:6c56fb4bc5f0 5 * SPDX-License-Identifier: Apache-2.0
nexpaq 0:6c56fb4bc5f0 6 *
nexpaq 0:6c56fb4bc5f0 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
nexpaq 0:6c56fb4bc5f0 8 * not use this file except in compliance with the License.
nexpaq 0:6c56fb4bc5f0 9 * You may obtain a copy of the License at
nexpaq 0:6c56fb4bc5f0 10 *
nexpaq 0:6c56fb4bc5f0 11 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 0:6c56fb4bc5f0 12 *
nexpaq 0:6c56fb4bc5f0 13 * Unless required by applicable law or agreed to in writing, software
nexpaq 0:6c56fb4bc5f0 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
nexpaq 0:6c56fb4bc5f0 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 0:6c56fb4bc5f0 16 * See the License for the specific language governing permissions and
nexpaq 0:6c56fb4bc5f0 17 * limitations under the License.
nexpaq 0:6c56fb4bc5f0 18 *
nexpaq 0:6c56fb4bc5f0 19 * This file is part of mbed TLS (https://tls.mbed.org)
nexpaq 0:6c56fb4bc5f0 20 */
nexpaq 0:6c56fb4bc5f0 21 /*
nexpaq 0:6c56fb4bc5f0 22 * The NIST SP 800-90 DRBGs are described in the following publucation.
nexpaq 0:6c56fb4bc5f0 23 *
nexpaq 0:6c56fb4bc5f0 24 * http://csrc.nist.gov/publications/nistpubs/800-90/SP800-90revised_March2007.pdf
nexpaq 0:6c56fb4bc5f0 25 */
nexpaq 0:6c56fb4bc5f0 26
nexpaq 0:6c56fb4bc5f0 27 #if !defined(MBEDTLS_CONFIG_FILE)
nexpaq 0:6c56fb4bc5f0 28 #include "mbedtls/config.h"
nexpaq 0:6c56fb4bc5f0 29 #else
nexpaq 0:6c56fb4bc5f0 30 #include MBEDTLS_CONFIG_FILE
nexpaq 0:6c56fb4bc5f0 31 #endif
nexpaq 0:6c56fb4bc5f0 32
nexpaq 0:6c56fb4bc5f0 33 #if defined(MBEDTLS_CTR_DRBG_C)
nexpaq 0:6c56fb4bc5f0 34
nexpaq 0:6c56fb4bc5f0 35 #include "mbedtls/ctr_drbg.h"
nexpaq 0:6c56fb4bc5f0 36
nexpaq 0:6c56fb4bc5f0 37 #include <string.h>
nexpaq 0:6c56fb4bc5f0 38
nexpaq 0:6c56fb4bc5f0 39 #if defined(MBEDTLS_FS_IO)
nexpaq 0:6c56fb4bc5f0 40 #include <stdio.h>
nexpaq 0:6c56fb4bc5f0 41 #endif
nexpaq 0:6c56fb4bc5f0 42
nexpaq 0:6c56fb4bc5f0 43 #if defined(MBEDTLS_SELF_TEST)
nexpaq 0:6c56fb4bc5f0 44 #if defined(MBEDTLS_PLATFORM_C)
nexpaq 0:6c56fb4bc5f0 45 #include "mbedtls/platform.h"
nexpaq 0:6c56fb4bc5f0 46 #else
nexpaq 0:6c56fb4bc5f0 47 #include <stdio.h>
nexpaq 0:6c56fb4bc5f0 48 #define mbedtls_printf printf
nexpaq 0:6c56fb4bc5f0 49 #endif /* MBEDTLS_PLATFORM_C */
nexpaq 0:6c56fb4bc5f0 50 #endif /* MBEDTLS_SELF_TEST */
nexpaq 0:6c56fb4bc5f0 51
nexpaq 0:6c56fb4bc5f0 52 /* Implementation that should never be optimized out by the compiler */
nexpaq 0:6c56fb4bc5f0 53 static void mbedtls_zeroize( void *v, size_t n ) {
nexpaq 0:6c56fb4bc5f0 54 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
nexpaq 0:6c56fb4bc5f0 55 }
nexpaq 0:6c56fb4bc5f0 56
nexpaq 0:6c56fb4bc5f0 57 /*
nexpaq 0:6c56fb4bc5f0 58 * CTR_DRBG context initialization
nexpaq 0:6c56fb4bc5f0 59 */
nexpaq 0:6c56fb4bc5f0 60 void mbedtls_ctr_drbg_init( mbedtls_ctr_drbg_context *ctx )
nexpaq 0:6c56fb4bc5f0 61 {
nexpaq 0:6c56fb4bc5f0 62 memset( ctx, 0, sizeof( mbedtls_ctr_drbg_context ) );
nexpaq 0:6c56fb4bc5f0 63
nexpaq 0:6c56fb4bc5f0 64 #if defined(MBEDTLS_THREADING_C)
nexpaq 0:6c56fb4bc5f0 65 mbedtls_mutex_init( &ctx->mutex );
nexpaq 0:6c56fb4bc5f0 66 #endif
nexpaq 0:6c56fb4bc5f0 67 }
nexpaq 0:6c56fb4bc5f0 68
nexpaq 0:6c56fb4bc5f0 69 /*
nexpaq 0:6c56fb4bc5f0 70 * Non-public function wrapped by mbedtls_ctr_drbg_seed(). Necessary to allow
nexpaq 0:6c56fb4bc5f0 71 * NIST tests to succeed (which require known length fixed entropy)
nexpaq 0:6c56fb4bc5f0 72 */
nexpaq 0:6c56fb4bc5f0 73 int mbedtls_ctr_drbg_seed_entropy_len(
nexpaq 0:6c56fb4bc5f0 74 mbedtls_ctr_drbg_context *ctx,
nexpaq 0:6c56fb4bc5f0 75 int (*f_entropy)(void *, unsigned char *, size_t),
nexpaq 0:6c56fb4bc5f0 76 void *p_entropy,
nexpaq 0:6c56fb4bc5f0 77 const unsigned char *custom,
nexpaq 0:6c56fb4bc5f0 78 size_t len,
nexpaq 0:6c56fb4bc5f0 79 size_t entropy_len )
nexpaq 0:6c56fb4bc5f0 80 {
nexpaq 0:6c56fb4bc5f0 81 int ret;
nexpaq 0:6c56fb4bc5f0 82 unsigned char key[MBEDTLS_CTR_DRBG_KEYSIZE];
nexpaq 0:6c56fb4bc5f0 83
nexpaq 0:6c56fb4bc5f0 84 memset( key, 0, MBEDTLS_CTR_DRBG_KEYSIZE );
nexpaq 0:6c56fb4bc5f0 85
nexpaq 0:6c56fb4bc5f0 86 mbedtls_aes_init( &ctx->aes_ctx );
nexpaq 0:6c56fb4bc5f0 87
nexpaq 0:6c56fb4bc5f0 88 ctx->f_entropy = f_entropy;
nexpaq 0:6c56fb4bc5f0 89 ctx->p_entropy = p_entropy;
nexpaq 0:6c56fb4bc5f0 90
nexpaq 0:6c56fb4bc5f0 91 ctx->entropy_len = entropy_len;
nexpaq 0:6c56fb4bc5f0 92 ctx->reseed_interval = MBEDTLS_CTR_DRBG_RESEED_INTERVAL;
nexpaq 0:6c56fb4bc5f0 93
nexpaq 0:6c56fb4bc5f0 94 /*
nexpaq 0:6c56fb4bc5f0 95 * Initialize with an empty key
nexpaq 0:6c56fb4bc5f0 96 */
nexpaq 0:6c56fb4bc5f0 97 mbedtls_aes_setkey_enc( &ctx->aes_ctx, key, MBEDTLS_CTR_DRBG_KEYBITS );
nexpaq 0:6c56fb4bc5f0 98
nexpaq 0:6c56fb4bc5f0 99 if( ( ret = mbedtls_ctr_drbg_reseed( ctx, custom, len ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 100 return( ret );
nexpaq 0:6c56fb4bc5f0 101
nexpaq 0:6c56fb4bc5f0 102 return( 0 );
nexpaq 0:6c56fb4bc5f0 103 }
nexpaq 0:6c56fb4bc5f0 104
nexpaq 0:6c56fb4bc5f0 105 int mbedtls_ctr_drbg_seed( mbedtls_ctr_drbg_context *ctx,
nexpaq 0:6c56fb4bc5f0 106 int (*f_entropy)(void *, unsigned char *, size_t),
nexpaq 0:6c56fb4bc5f0 107 void *p_entropy,
nexpaq 0:6c56fb4bc5f0 108 const unsigned char *custom,
nexpaq 0:6c56fb4bc5f0 109 size_t len )
nexpaq 0:6c56fb4bc5f0 110 {
nexpaq 0:6c56fb4bc5f0 111 return( mbedtls_ctr_drbg_seed_entropy_len( ctx, f_entropy, p_entropy, custom, len,
nexpaq 0:6c56fb4bc5f0 112 MBEDTLS_CTR_DRBG_ENTROPY_LEN ) );
nexpaq 0:6c56fb4bc5f0 113 }
nexpaq 0:6c56fb4bc5f0 114
nexpaq 0:6c56fb4bc5f0 115 void mbedtls_ctr_drbg_free( mbedtls_ctr_drbg_context *ctx )
nexpaq 0:6c56fb4bc5f0 116 {
nexpaq 0:6c56fb4bc5f0 117 if( ctx == NULL )
nexpaq 0:6c56fb4bc5f0 118 return;
nexpaq 0:6c56fb4bc5f0 119
nexpaq 0:6c56fb4bc5f0 120 #if defined(MBEDTLS_THREADING_C)
nexpaq 0:6c56fb4bc5f0 121 mbedtls_mutex_free( &ctx->mutex );
nexpaq 0:6c56fb4bc5f0 122 #endif
nexpaq 0:6c56fb4bc5f0 123 mbedtls_aes_free( &ctx->aes_ctx );
nexpaq 0:6c56fb4bc5f0 124 mbedtls_zeroize( ctx, sizeof( mbedtls_ctr_drbg_context ) );
nexpaq 0:6c56fb4bc5f0 125 }
nexpaq 0:6c56fb4bc5f0 126
nexpaq 0:6c56fb4bc5f0 127 void mbedtls_ctr_drbg_set_prediction_resistance( mbedtls_ctr_drbg_context *ctx, int resistance )
nexpaq 0:6c56fb4bc5f0 128 {
nexpaq 0:6c56fb4bc5f0 129 ctx->prediction_resistance = resistance;
nexpaq 0:6c56fb4bc5f0 130 }
nexpaq 0:6c56fb4bc5f0 131
nexpaq 0:6c56fb4bc5f0 132 void mbedtls_ctr_drbg_set_entropy_len( mbedtls_ctr_drbg_context *ctx, size_t len )
nexpaq 0:6c56fb4bc5f0 133 {
nexpaq 0:6c56fb4bc5f0 134 ctx->entropy_len = len;
nexpaq 0:6c56fb4bc5f0 135 }
nexpaq 0:6c56fb4bc5f0 136
nexpaq 0:6c56fb4bc5f0 137 void mbedtls_ctr_drbg_set_reseed_interval( mbedtls_ctr_drbg_context *ctx, int interval )
nexpaq 0:6c56fb4bc5f0 138 {
nexpaq 0:6c56fb4bc5f0 139 ctx->reseed_interval = interval;
nexpaq 0:6c56fb4bc5f0 140 }
nexpaq 0:6c56fb4bc5f0 141
nexpaq 0:6c56fb4bc5f0 142 static int block_cipher_df( unsigned char *output,
nexpaq 0:6c56fb4bc5f0 143 const unsigned char *data, size_t data_len )
nexpaq 0:6c56fb4bc5f0 144 {
nexpaq 0:6c56fb4bc5f0 145 unsigned char buf[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16];
nexpaq 0:6c56fb4bc5f0 146 unsigned char tmp[MBEDTLS_CTR_DRBG_SEEDLEN];
nexpaq 0:6c56fb4bc5f0 147 unsigned char key[MBEDTLS_CTR_DRBG_KEYSIZE];
nexpaq 0:6c56fb4bc5f0 148 unsigned char chain[MBEDTLS_CTR_DRBG_BLOCKSIZE];
nexpaq 0:6c56fb4bc5f0 149 unsigned char *p, *iv;
nexpaq 0:6c56fb4bc5f0 150 mbedtls_aes_context aes_ctx;
nexpaq 0:6c56fb4bc5f0 151
nexpaq 0:6c56fb4bc5f0 152 int i, j;
nexpaq 0:6c56fb4bc5f0 153 size_t buf_len, use_len;
nexpaq 0:6c56fb4bc5f0 154
nexpaq 0:6c56fb4bc5f0 155 if( data_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
nexpaq 0:6c56fb4bc5f0 156 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
nexpaq 0:6c56fb4bc5f0 157
nexpaq 0:6c56fb4bc5f0 158 memset( buf, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16 );
nexpaq 0:6c56fb4bc5f0 159 mbedtls_aes_init( &aes_ctx );
nexpaq 0:6c56fb4bc5f0 160
nexpaq 0:6c56fb4bc5f0 161 /*
nexpaq 0:6c56fb4bc5f0 162 * Construct IV (16 bytes) and S in buffer
nexpaq 0:6c56fb4bc5f0 163 * IV = Counter (in 32-bits) padded to 16 with zeroes
nexpaq 0:6c56fb4bc5f0 164 * S = Length input string (in 32-bits) || Length of output (in 32-bits) ||
nexpaq 0:6c56fb4bc5f0 165 * data || 0x80
nexpaq 0:6c56fb4bc5f0 166 * (Total is padded to a multiple of 16-bytes with zeroes)
nexpaq 0:6c56fb4bc5f0 167 */
nexpaq 0:6c56fb4bc5f0 168 p = buf + MBEDTLS_CTR_DRBG_BLOCKSIZE;
nexpaq 0:6c56fb4bc5f0 169 *p++ = ( data_len >> 24 ) & 0xff;
nexpaq 0:6c56fb4bc5f0 170 *p++ = ( data_len >> 16 ) & 0xff;
nexpaq 0:6c56fb4bc5f0 171 *p++ = ( data_len >> 8 ) & 0xff;
nexpaq 0:6c56fb4bc5f0 172 *p++ = ( data_len ) & 0xff;
nexpaq 0:6c56fb4bc5f0 173 p += 3;
nexpaq 0:6c56fb4bc5f0 174 *p++ = MBEDTLS_CTR_DRBG_SEEDLEN;
nexpaq 0:6c56fb4bc5f0 175 memcpy( p, data, data_len );
nexpaq 0:6c56fb4bc5f0 176 p[data_len] = 0x80;
nexpaq 0:6c56fb4bc5f0 177
nexpaq 0:6c56fb4bc5f0 178 buf_len = MBEDTLS_CTR_DRBG_BLOCKSIZE + 8 + data_len + 1;
nexpaq 0:6c56fb4bc5f0 179
nexpaq 0:6c56fb4bc5f0 180 for( i = 0; i < MBEDTLS_CTR_DRBG_KEYSIZE; i++ )
nexpaq 0:6c56fb4bc5f0 181 key[i] = i;
nexpaq 0:6c56fb4bc5f0 182
nexpaq 0:6c56fb4bc5f0 183 mbedtls_aes_setkey_enc( &aes_ctx, key, MBEDTLS_CTR_DRBG_KEYBITS );
nexpaq 0:6c56fb4bc5f0 184
nexpaq 0:6c56fb4bc5f0 185 /*
nexpaq 0:6c56fb4bc5f0 186 * Reduce data to MBEDTLS_CTR_DRBG_SEEDLEN bytes of data
nexpaq 0:6c56fb4bc5f0 187 */
nexpaq 0:6c56fb4bc5f0 188 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
nexpaq 0:6c56fb4bc5f0 189 {
nexpaq 0:6c56fb4bc5f0 190 p = buf;
nexpaq 0:6c56fb4bc5f0 191 memset( chain, 0, MBEDTLS_CTR_DRBG_BLOCKSIZE );
nexpaq 0:6c56fb4bc5f0 192 use_len = buf_len;
nexpaq 0:6c56fb4bc5f0 193
nexpaq 0:6c56fb4bc5f0 194 while( use_len > 0 )
nexpaq 0:6c56fb4bc5f0 195 {
nexpaq 0:6c56fb4bc5f0 196 for( i = 0; i < MBEDTLS_CTR_DRBG_BLOCKSIZE; i++ )
nexpaq 0:6c56fb4bc5f0 197 chain[i] ^= p[i];
nexpaq 0:6c56fb4bc5f0 198 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
nexpaq 0:6c56fb4bc5f0 199 use_len -= ( use_len >= MBEDTLS_CTR_DRBG_BLOCKSIZE ) ?
nexpaq 0:6c56fb4bc5f0 200 MBEDTLS_CTR_DRBG_BLOCKSIZE : use_len;
nexpaq 0:6c56fb4bc5f0 201
nexpaq 0:6c56fb4bc5f0 202 mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, chain, chain );
nexpaq 0:6c56fb4bc5f0 203 }
nexpaq 0:6c56fb4bc5f0 204
nexpaq 0:6c56fb4bc5f0 205 memcpy( tmp + j, chain, MBEDTLS_CTR_DRBG_BLOCKSIZE );
nexpaq 0:6c56fb4bc5f0 206
nexpaq 0:6c56fb4bc5f0 207 /*
nexpaq 0:6c56fb4bc5f0 208 * Update IV
nexpaq 0:6c56fb4bc5f0 209 */
nexpaq 0:6c56fb4bc5f0 210 buf[3]++;
nexpaq 0:6c56fb4bc5f0 211 }
nexpaq 0:6c56fb4bc5f0 212
nexpaq 0:6c56fb4bc5f0 213 /*
nexpaq 0:6c56fb4bc5f0 214 * Do final encryption with reduced data
nexpaq 0:6c56fb4bc5f0 215 */
nexpaq 0:6c56fb4bc5f0 216 mbedtls_aes_setkey_enc( &aes_ctx, tmp, MBEDTLS_CTR_DRBG_KEYBITS );
nexpaq 0:6c56fb4bc5f0 217 iv = tmp + MBEDTLS_CTR_DRBG_KEYSIZE;
nexpaq 0:6c56fb4bc5f0 218 p = output;
nexpaq 0:6c56fb4bc5f0 219
nexpaq 0:6c56fb4bc5f0 220 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
nexpaq 0:6c56fb4bc5f0 221 {
nexpaq 0:6c56fb4bc5f0 222 mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, iv, iv );
nexpaq 0:6c56fb4bc5f0 223 memcpy( p, iv, MBEDTLS_CTR_DRBG_BLOCKSIZE );
nexpaq 0:6c56fb4bc5f0 224 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
nexpaq 0:6c56fb4bc5f0 225 }
nexpaq 0:6c56fb4bc5f0 226
nexpaq 0:6c56fb4bc5f0 227 mbedtls_aes_free( &aes_ctx );
nexpaq 0:6c56fb4bc5f0 228
nexpaq 0:6c56fb4bc5f0 229 return( 0 );
nexpaq 0:6c56fb4bc5f0 230 }
nexpaq 0:6c56fb4bc5f0 231
nexpaq 0:6c56fb4bc5f0 232 static int ctr_drbg_update_internal( mbedtls_ctr_drbg_context *ctx,
nexpaq 0:6c56fb4bc5f0 233 const unsigned char data[MBEDTLS_CTR_DRBG_SEEDLEN] )
nexpaq 0:6c56fb4bc5f0 234 {
nexpaq 0:6c56fb4bc5f0 235 unsigned char tmp[MBEDTLS_CTR_DRBG_SEEDLEN];
nexpaq 0:6c56fb4bc5f0 236 unsigned char *p = tmp;
nexpaq 0:6c56fb4bc5f0 237 int i, j;
nexpaq 0:6c56fb4bc5f0 238
nexpaq 0:6c56fb4bc5f0 239 memset( tmp, 0, MBEDTLS_CTR_DRBG_SEEDLEN );
nexpaq 0:6c56fb4bc5f0 240
nexpaq 0:6c56fb4bc5f0 241 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
nexpaq 0:6c56fb4bc5f0 242 {
nexpaq 0:6c56fb4bc5f0 243 /*
nexpaq 0:6c56fb4bc5f0 244 * Increase counter
nexpaq 0:6c56fb4bc5f0 245 */
nexpaq 0:6c56fb4bc5f0 246 for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- )
nexpaq 0:6c56fb4bc5f0 247 if( ++ctx->counter[i - 1] != 0 )
nexpaq 0:6c56fb4bc5f0 248 break;
nexpaq 0:6c56fb4bc5f0 249
nexpaq 0:6c56fb4bc5f0 250 /*
nexpaq 0:6c56fb4bc5f0 251 * Crypt counter block
nexpaq 0:6c56fb4bc5f0 252 */
nexpaq 0:6c56fb4bc5f0 253 mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, ctx->counter, p );
nexpaq 0:6c56fb4bc5f0 254
nexpaq 0:6c56fb4bc5f0 255 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
nexpaq 0:6c56fb4bc5f0 256 }
nexpaq 0:6c56fb4bc5f0 257
nexpaq 0:6c56fb4bc5f0 258 for( i = 0; i < MBEDTLS_CTR_DRBG_SEEDLEN; i++ )
nexpaq 0:6c56fb4bc5f0 259 tmp[i] ^= data[i];
nexpaq 0:6c56fb4bc5f0 260
nexpaq 0:6c56fb4bc5f0 261 /*
nexpaq 0:6c56fb4bc5f0 262 * Update key and counter
nexpaq 0:6c56fb4bc5f0 263 */
nexpaq 0:6c56fb4bc5f0 264 mbedtls_aes_setkey_enc( &ctx->aes_ctx, tmp, MBEDTLS_CTR_DRBG_KEYBITS );
nexpaq 0:6c56fb4bc5f0 265 memcpy( ctx->counter, tmp + MBEDTLS_CTR_DRBG_KEYSIZE, MBEDTLS_CTR_DRBG_BLOCKSIZE );
nexpaq 0:6c56fb4bc5f0 266
nexpaq 0:6c56fb4bc5f0 267 return( 0 );
nexpaq 0:6c56fb4bc5f0 268 }
nexpaq 0:6c56fb4bc5f0 269
nexpaq 0:6c56fb4bc5f0 270 void mbedtls_ctr_drbg_update( mbedtls_ctr_drbg_context *ctx,
nexpaq 0:6c56fb4bc5f0 271 const unsigned char *additional, size_t add_len )
nexpaq 0:6c56fb4bc5f0 272 {
nexpaq 0:6c56fb4bc5f0 273 unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN];
nexpaq 0:6c56fb4bc5f0 274
nexpaq 0:6c56fb4bc5f0 275 if( add_len > 0 )
nexpaq 0:6c56fb4bc5f0 276 {
nexpaq 0:6c56fb4bc5f0 277 /* MAX_INPUT would be more logical here, but we have to match
nexpaq 0:6c56fb4bc5f0 278 * block_cipher_df()'s limits since we can't propagate errors */
nexpaq 0:6c56fb4bc5f0 279 if( add_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
nexpaq 0:6c56fb4bc5f0 280 add_len = MBEDTLS_CTR_DRBG_MAX_SEED_INPUT;
nexpaq 0:6c56fb4bc5f0 281
nexpaq 0:6c56fb4bc5f0 282 block_cipher_df( add_input, additional, add_len );
nexpaq 0:6c56fb4bc5f0 283 ctr_drbg_update_internal( ctx, add_input );
nexpaq 0:6c56fb4bc5f0 284 }
nexpaq 0:6c56fb4bc5f0 285 }
nexpaq 0:6c56fb4bc5f0 286
nexpaq 0:6c56fb4bc5f0 287 int mbedtls_ctr_drbg_reseed( mbedtls_ctr_drbg_context *ctx,
nexpaq 0:6c56fb4bc5f0 288 const unsigned char *additional, size_t len )
nexpaq 0:6c56fb4bc5f0 289 {
nexpaq 0:6c56fb4bc5f0 290 unsigned char seed[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT];
nexpaq 0:6c56fb4bc5f0 291 size_t seedlen = 0;
nexpaq 0:6c56fb4bc5f0 292
nexpaq 0:6c56fb4bc5f0 293 if( ctx->entropy_len + len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
nexpaq 0:6c56fb4bc5f0 294 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
nexpaq 0:6c56fb4bc5f0 295
nexpaq 0:6c56fb4bc5f0 296 memset( seed, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT );
nexpaq 0:6c56fb4bc5f0 297
nexpaq 0:6c56fb4bc5f0 298 /*
nexpaq 0:6c56fb4bc5f0 299 * Gather entropy_len bytes of entropy to seed state
nexpaq 0:6c56fb4bc5f0 300 */
nexpaq 0:6c56fb4bc5f0 301 if( 0 != ctx->f_entropy( ctx->p_entropy, seed,
nexpaq 0:6c56fb4bc5f0 302 ctx->entropy_len ) )
nexpaq 0:6c56fb4bc5f0 303 {
nexpaq 0:6c56fb4bc5f0 304 return( MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED );
nexpaq 0:6c56fb4bc5f0 305 }
nexpaq 0:6c56fb4bc5f0 306
nexpaq 0:6c56fb4bc5f0 307 seedlen += ctx->entropy_len;
nexpaq 0:6c56fb4bc5f0 308
nexpaq 0:6c56fb4bc5f0 309 /*
nexpaq 0:6c56fb4bc5f0 310 * Add additional data
nexpaq 0:6c56fb4bc5f0 311 */
nexpaq 0:6c56fb4bc5f0 312 if( additional && len )
nexpaq 0:6c56fb4bc5f0 313 {
nexpaq 0:6c56fb4bc5f0 314 memcpy( seed + seedlen, additional, len );
nexpaq 0:6c56fb4bc5f0 315 seedlen += len;
nexpaq 0:6c56fb4bc5f0 316 }
nexpaq 0:6c56fb4bc5f0 317
nexpaq 0:6c56fb4bc5f0 318 /*
nexpaq 0:6c56fb4bc5f0 319 * Reduce to 384 bits
nexpaq 0:6c56fb4bc5f0 320 */
nexpaq 0:6c56fb4bc5f0 321 block_cipher_df( seed, seed, seedlen );
nexpaq 0:6c56fb4bc5f0 322
nexpaq 0:6c56fb4bc5f0 323 /*
nexpaq 0:6c56fb4bc5f0 324 * Update state
nexpaq 0:6c56fb4bc5f0 325 */
nexpaq 0:6c56fb4bc5f0 326 ctr_drbg_update_internal( ctx, seed );
nexpaq 0:6c56fb4bc5f0 327 ctx->reseed_counter = 1;
nexpaq 0:6c56fb4bc5f0 328
nexpaq 0:6c56fb4bc5f0 329 return( 0 );
nexpaq 0:6c56fb4bc5f0 330 }
nexpaq 0:6c56fb4bc5f0 331
nexpaq 0:6c56fb4bc5f0 332 int mbedtls_ctr_drbg_random_with_add( void *p_rng,
nexpaq 0:6c56fb4bc5f0 333 unsigned char *output, size_t output_len,
nexpaq 0:6c56fb4bc5f0 334 const unsigned char *additional, size_t add_len )
nexpaq 0:6c56fb4bc5f0 335 {
nexpaq 0:6c56fb4bc5f0 336 int ret = 0;
nexpaq 0:6c56fb4bc5f0 337 mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng;
nexpaq 0:6c56fb4bc5f0 338 unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN];
nexpaq 0:6c56fb4bc5f0 339 unsigned char *p = output;
nexpaq 0:6c56fb4bc5f0 340 unsigned char tmp[MBEDTLS_CTR_DRBG_BLOCKSIZE];
nexpaq 0:6c56fb4bc5f0 341 int i;
nexpaq 0:6c56fb4bc5f0 342 size_t use_len;
nexpaq 0:6c56fb4bc5f0 343
nexpaq 0:6c56fb4bc5f0 344 if( output_len > MBEDTLS_CTR_DRBG_MAX_REQUEST )
nexpaq 0:6c56fb4bc5f0 345 return( MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG );
nexpaq 0:6c56fb4bc5f0 346
nexpaq 0:6c56fb4bc5f0 347 if( add_len > MBEDTLS_CTR_DRBG_MAX_INPUT )
nexpaq 0:6c56fb4bc5f0 348 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
nexpaq 0:6c56fb4bc5f0 349
nexpaq 0:6c56fb4bc5f0 350 memset( add_input, 0, MBEDTLS_CTR_DRBG_SEEDLEN );
nexpaq 0:6c56fb4bc5f0 351
nexpaq 0:6c56fb4bc5f0 352 if( ctx->reseed_counter > ctx->reseed_interval ||
nexpaq 0:6c56fb4bc5f0 353 ctx->prediction_resistance )
nexpaq 0:6c56fb4bc5f0 354 {
nexpaq 0:6c56fb4bc5f0 355 if( ( ret = mbedtls_ctr_drbg_reseed( ctx, additional, add_len ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 356 return( ret );
nexpaq 0:6c56fb4bc5f0 357
nexpaq 0:6c56fb4bc5f0 358 add_len = 0;
nexpaq 0:6c56fb4bc5f0 359 }
nexpaq 0:6c56fb4bc5f0 360
nexpaq 0:6c56fb4bc5f0 361 if( add_len > 0 )
nexpaq 0:6c56fb4bc5f0 362 {
nexpaq 0:6c56fb4bc5f0 363 block_cipher_df( add_input, additional, add_len );
nexpaq 0:6c56fb4bc5f0 364 ctr_drbg_update_internal( ctx, add_input );
nexpaq 0:6c56fb4bc5f0 365 }
nexpaq 0:6c56fb4bc5f0 366
nexpaq 0:6c56fb4bc5f0 367 while( output_len > 0 )
nexpaq 0:6c56fb4bc5f0 368 {
nexpaq 0:6c56fb4bc5f0 369 /*
nexpaq 0:6c56fb4bc5f0 370 * Increase counter
nexpaq 0:6c56fb4bc5f0 371 */
nexpaq 0:6c56fb4bc5f0 372 for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- )
nexpaq 0:6c56fb4bc5f0 373 if( ++ctx->counter[i - 1] != 0 )
nexpaq 0:6c56fb4bc5f0 374 break;
nexpaq 0:6c56fb4bc5f0 375
nexpaq 0:6c56fb4bc5f0 376 /*
nexpaq 0:6c56fb4bc5f0 377 * Crypt counter block
nexpaq 0:6c56fb4bc5f0 378 */
nexpaq 0:6c56fb4bc5f0 379 mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, ctx->counter, tmp );
nexpaq 0:6c56fb4bc5f0 380
nexpaq 0:6c56fb4bc5f0 381 use_len = ( output_len > MBEDTLS_CTR_DRBG_BLOCKSIZE ) ? MBEDTLS_CTR_DRBG_BLOCKSIZE :
nexpaq 0:6c56fb4bc5f0 382 output_len;
nexpaq 0:6c56fb4bc5f0 383 /*
nexpaq 0:6c56fb4bc5f0 384 * Copy random block to destination
nexpaq 0:6c56fb4bc5f0 385 */
nexpaq 0:6c56fb4bc5f0 386 memcpy( p, tmp, use_len );
nexpaq 0:6c56fb4bc5f0 387 p += use_len;
nexpaq 0:6c56fb4bc5f0 388 output_len -= use_len;
nexpaq 0:6c56fb4bc5f0 389 }
nexpaq 0:6c56fb4bc5f0 390
nexpaq 0:6c56fb4bc5f0 391 ctr_drbg_update_internal( ctx, add_input );
nexpaq 0:6c56fb4bc5f0 392
nexpaq 0:6c56fb4bc5f0 393 ctx->reseed_counter++;
nexpaq 0:6c56fb4bc5f0 394
nexpaq 0:6c56fb4bc5f0 395 return( 0 );
nexpaq 0:6c56fb4bc5f0 396 }
nexpaq 0:6c56fb4bc5f0 397
nexpaq 0:6c56fb4bc5f0 398 int mbedtls_ctr_drbg_random( void *p_rng, unsigned char *output, size_t output_len )
nexpaq 0:6c56fb4bc5f0 399 {
nexpaq 0:6c56fb4bc5f0 400 int ret;
nexpaq 0:6c56fb4bc5f0 401 mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng;
nexpaq 0:6c56fb4bc5f0 402
nexpaq 0:6c56fb4bc5f0 403 #if defined(MBEDTLS_THREADING_C)
nexpaq 0:6c56fb4bc5f0 404 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 405 return( ret );
nexpaq 0:6c56fb4bc5f0 406 #endif
nexpaq 0:6c56fb4bc5f0 407
nexpaq 0:6c56fb4bc5f0 408 ret = mbedtls_ctr_drbg_random_with_add( ctx, output, output_len, NULL, 0 );
nexpaq 0:6c56fb4bc5f0 409
nexpaq 0:6c56fb4bc5f0 410 #if defined(MBEDTLS_THREADING_C)
nexpaq 0:6c56fb4bc5f0 411 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
nexpaq 0:6c56fb4bc5f0 412 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
nexpaq 0:6c56fb4bc5f0 413 #endif
nexpaq 0:6c56fb4bc5f0 414
nexpaq 0:6c56fb4bc5f0 415 return( ret );
nexpaq 0:6c56fb4bc5f0 416 }
nexpaq 0:6c56fb4bc5f0 417
nexpaq 0:6c56fb4bc5f0 418 #if defined(MBEDTLS_FS_IO)
nexpaq 0:6c56fb4bc5f0 419 int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path )
nexpaq 0:6c56fb4bc5f0 420 {
nexpaq 0:6c56fb4bc5f0 421 int ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR;
nexpaq 0:6c56fb4bc5f0 422 FILE *f;
nexpaq 0:6c56fb4bc5f0 423 unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ];
nexpaq 0:6c56fb4bc5f0 424
nexpaq 0:6c56fb4bc5f0 425 if( ( f = fopen( path, "wb" ) ) == NULL )
nexpaq 0:6c56fb4bc5f0 426 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
nexpaq 0:6c56fb4bc5f0 427
nexpaq 0:6c56fb4bc5f0 428 if( ( ret = mbedtls_ctr_drbg_random( ctx, buf, MBEDTLS_CTR_DRBG_MAX_INPUT ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 429 goto exit;
nexpaq 0:6c56fb4bc5f0 430
nexpaq 0:6c56fb4bc5f0 431 if( fwrite( buf, 1, MBEDTLS_CTR_DRBG_MAX_INPUT, f ) != MBEDTLS_CTR_DRBG_MAX_INPUT )
nexpaq 0:6c56fb4bc5f0 432 {
nexpaq 0:6c56fb4bc5f0 433 ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR;
nexpaq 0:6c56fb4bc5f0 434 goto exit;
nexpaq 0:6c56fb4bc5f0 435 }
nexpaq 0:6c56fb4bc5f0 436
nexpaq 0:6c56fb4bc5f0 437 ret = 0;
nexpaq 0:6c56fb4bc5f0 438
nexpaq 0:6c56fb4bc5f0 439 exit:
nexpaq 0:6c56fb4bc5f0 440 fclose( f );
nexpaq 0:6c56fb4bc5f0 441 return( ret );
nexpaq 0:6c56fb4bc5f0 442 }
nexpaq 0:6c56fb4bc5f0 443
nexpaq 0:6c56fb4bc5f0 444 int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path )
nexpaq 0:6c56fb4bc5f0 445 {
nexpaq 0:6c56fb4bc5f0 446 FILE *f;
nexpaq 0:6c56fb4bc5f0 447 size_t n;
nexpaq 0:6c56fb4bc5f0 448 unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ];
nexpaq 0:6c56fb4bc5f0 449
nexpaq 0:6c56fb4bc5f0 450 if( ( f = fopen( path, "rb" ) ) == NULL )
nexpaq 0:6c56fb4bc5f0 451 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
nexpaq 0:6c56fb4bc5f0 452
nexpaq 0:6c56fb4bc5f0 453 fseek( f, 0, SEEK_END );
nexpaq 0:6c56fb4bc5f0 454 n = (size_t) ftell( f );
nexpaq 0:6c56fb4bc5f0 455 fseek( f, 0, SEEK_SET );
nexpaq 0:6c56fb4bc5f0 456
nexpaq 0:6c56fb4bc5f0 457 if( n > MBEDTLS_CTR_DRBG_MAX_INPUT )
nexpaq 0:6c56fb4bc5f0 458 {
nexpaq 0:6c56fb4bc5f0 459 fclose( f );
nexpaq 0:6c56fb4bc5f0 460 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
nexpaq 0:6c56fb4bc5f0 461 }
nexpaq 0:6c56fb4bc5f0 462
nexpaq 0:6c56fb4bc5f0 463 if( fread( buf, 1, n, f ) != n )
nexpaq 0:6c56fb4bc5f0 464 {
nexpaq 0:6c56fb4bc5f0 465 fclose( f );
nexpaq 0:6c56fb4bc5f0 466 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
nexpaq 0:6c56fb4bc5f0 467 }
nexpaq 0:6c56fb4bc5f0 468
nexpaq 0:6c56fb4bc5f0 469 fclose( f );
nexpaq 0:6c56fb4bc5f0 470
nexpaq 0:6c56fb4bc5f0 471 mbedtls_ctr_drbg_update( ctx, buf, n );
nexpaq 0:6c56fb4bc5f0 472
nexpaq 0:6c56fb4bc5f0 473 return( mbedtls_ctr_drbg_write_seed_file( ctx, path ) );
nexpaq 0:6c56fb4bc5f0 474 }
nexpaq 0:6c56fb4bc5f0 475 #endif /* MBEDTLS_FS_IO */
nexpaq 0:6c56fb4bc5f0 476
nexpaq 0:6c56fb4bc5f0 477 #if defined(MBEDTLS_SELF_TEST)
nexpaq 0:6c56fb4bc5f0 478
nexpaq 0:6c56fb4bc5f0 479 static const unsigned char entropy_source_pr[96] =
nexpaq 0:6c56fb4bc5f0 480 { 0xc1, 0x80, 0x81, 0xa6, 0x5d, 0x44, 0x02, 0x16,
nexpaq 0:6c56fb4bc5f0 481 0x19, 0xb3, 0xf1, 0x80, 0xb1, 0xc9, 0x20, 0x02,
nexpaq 0:6c56fb4bc5f0 482 0x6a, 0x54, 0x6f, 0x0c, 0x70, 0x81, 0x49, 0x8b,
nexpaq 0:6c56fb4bc5f0 483 0x6e, 0xa6, 0x62, 0x52, 0x6d, 0x51, 0xb1, 0xcb,
nexpaq 0:6c56fb4bc5f0 484 0x58, 0x3b, 0xfa, 0xd5, 0x37, 0x5f, 0xfb, 0xc9,
nexpaq 0:6c56fb4bc5f0 485 0xff, 0x46, 0xd2, 0x19, 0xc7, 0x22, 0x3e, 0x95,
nexpaq 0:6c56fb4bc5f0 486 0x45, 0x9d, 0x82, 0xe1, 0xe7, 0x22, 0x9f, 0x63,
nexpaq 0:6c56fb4bc5f0 487 0x31, 0x69, 0xd2, 0x6b, 0x57, 0x47, 0x4f, 0xa3,
nexpaq 0:6c56fb4bc5f0 488 0x37, 0xc9, 0x98, 0x1c, 0x0b, 0xfb, 0x91, 0x31,
nexpaq 0:6c56fb4bc5f0 489 0x4d, 0x55, 0xb9, 0xe9, 0x1c, 0x5a, 0x5e, 0xe4,
nexpaq 0:6c56fb4bc5f0 490 0x93, 0x92, 0xcf, 0xc5, 0x23, 0x12, 0xd5, 0x56,
nexpaq 0:6c56fb4bc5f0 491 0x2c, 0x4a, 0x6e, 0xff, 0xdc, 0x10, 0xd0, 0x68 };
nexpaq 0:6c56fb4bc5f0 492
nexpaq 0:6c56fb4bc5f0 493 static const unsigned char entropy_source_nopr[64] =
nexpaq 0:6c56fb4bc5f0 494 { 0x5a, 0x19, 0x4d, 0x5e, 0x2b, 0x31, 0x58, 0x14,
nexpaq 0:6c56fb4bc5f0 495 0x54, 0xde, 0xf6, 0x75, 0xfb, 0x79, 0x58, 0xfe,
nexpaq 0:6c56fb4bc5f0 496 0xc7, 0xdb, 0x87, 0x3e, 0x56, 0x89, 0xfc, 0x9d,
nexpaq 0:6c56fb4bc5f0 497 0x03, 0x21, 0x7c, 0x68, 0xd8, 0x03, 0x38, 0x20,
nexpaq 0:6c56fb4bc5f0 498 0xf9, 0xe6, 0x5e, 0x04, 0xd8, 0x56, 0xf3, 0xa9,
nexpaq 0:6c56fb4bc5f0 499 0xc4, 0x4a, 0x4c, 0xbd, 0xc1, 0xd0, 0x08, 0x46,
nexpaq 0:6c56fb4bc5f0 500 0xf5, 0x98, 0x3d, 0x77, 0x1c, 0x1b, 0x13, 0x7e,
nexpaq 0:6c56fb4bc5f0 501 0x4e, 0x0f, 0x9d, 0x8e, 0xf4, 0x09, 0xf9, 0x2e };
nexpaq 0:6c56fb4bc5f0 502
nexpaq 0:6c56fb4bc5f0 503 static const unsigned char nonce_pers_pr[16] =
nexpaq 0:6c56fb4bc5f0 504 { 0xd2, 0x54, 0xfc, 0xff, 0x02, 0x1e, 0x69, 0xd2,
nexpaq 0:6c56fb4bc5f0 505 0x29, 0xc9, 0xcf, 0xad, 0x85, 0xfa, 0x48, 0x6c };
nexpaq 0:6c56fb4bc5f0 506
nexpaq 0:6c56fb4bc5f0 507 static const unsigned char nonce_pers_nopr[16] =
nexpaq 0:6c56fb4bc5f0 508 { 0x1b, 0x54, 0xb8, 0xff, 0x06, 0x42, 0xbf, 0xf5,
nexpaq 0:6c56fb4bc5f0 509 0x21, 0xf1, 0x5c, 0x1c, 0x0b, 0x66, 0x5f, 0x3f };
nexpaq 0:6c56fb4bc5f0 510
nexpaq 0:6c56fb4bc5f0 511 static const unsigned char result_pr[16] =
nexpaq 0:6c56fb4bc5f0 512 { 0x34, 0x01, 0x16, 0x56, 0xb4, 0x29, 0x00, 0x8f,
nexpaq 0:6c56fb4bc5f0 513 0x35, 0x63, 0xec, 0xb5, 0xf2, 0x59, 0x07, 0x23 };
nexpaq 0:6c56fb4bc5f0 514
nexpaq 0:6c56fb4bc5f0 515 static const unsigned char result_nopr[16] =
nexpaq 0:6c56fb4bc5f0 516 { 0xa0, 0x54, 0x30, 0x3d, 0x8a, 0x7e, 0xa9, 0x88,
nexpaq 0:6c56fb4bc5f0 517 0x9d, 0x90, 0x3e, 0x07, 0x7c, 0x6f, 0x21, 0x8f };
nexpaq 0:6c56fb4bc5f0 518
nexpaq 0:6c56fb4bc5f0 519 static size_t test_offset;
nexpaq 0:6c56fb4bc5f0 520 static int ctr_drbg_self_test_entropy( void *data, unsigned char *buf,
nexpaq 0:6c56fb4bc5f0 521 size_t len )
nexpaq 0:6c56fb4bc5f0 522 {
nexpaq 0:6c56fb4bc5f0 523 const unsigned char *p = data;
nexpaq 0:6c56fb4bc5f0 524 memcpy( buf, p + test_offset, len );
nexpaq 0:6c56fb4bc5f0 525 test_offset += len;
nexpaq 0:6c56fb4bc5f0 526 return( 0 );
nexpaq 0:6c56fb4bc5f0 527 }
nexpaq 0:6c56fb4bc5f0 528
nexpaq 0:6c56fb4bc5f0 529 #define CHK( c ) if( (c) != 0 ) \
nexpaq 0:6c56fb4bc5f0 530 { \
nexpaq 0:6c56fb4bc5f0 531 if( verbose != 0 ) \
nexpaq 0:6c56fb4bc5f0 532 mbedtls_printf( "failed\n" ); \
nexpaq 0:6c56fb4bc5f0 533 return( 1 ); \
nexpaq 0:6c56fb4bc5f0 534 }
nexpaq 0:6c56fb4bc5f0 535
nexpaq 0:6c56fb4bc5f0 536 /*
nexpaq 0:6c56fb4bc5f0 537 * Checkup routine
nexpaq 0:6c56fb4bc5f0 538 */
nexpaq 0:6c56fb4bc5f0 539 int mbedtls_ctr_drbg_self_test( int verbose )
nexpaq 0:6c56fb4bc5f0 540 {
nexpaq 0:6c56fb4bc5f0 541 mbedtls_ctr_drbg_context ctx;
nexpaq 0:6c56fb4bc5f0 542 unsigned char buf[16];
nexpaq 0:6c56fb4bc5f0 543
nexpaq 0:6c56fb4bc5f0 544 mbedtls_ctr_drbg_init( &ctx );
nexpaq 0:6c56fb4bc5f0 545
nexpaq 0:6c56fb4bc5f0 546 /*
nexpaq 0:6c56fb4bc5f0 547 * Based on a NIST CTR_DRBG test vector (PR = True)
nexpaq 0:6c56fb4bc5f0 548 */
nexpaq 0:6c56fb4bc5f0 549 if( verbose != 0 )
nexpaq 0:6c56fb4bc5f0 550 mbedtls_printf( " CTR_DRBG (PR = TRUE) : " );
nexpaq 0:6c56fb4bc5f0 551
nexpaq 0:6c56fb4bc5f0 552 test_offset = 0;
nexpaq 0:6c56fb4bc5f0 553 CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy,
nexpaq 0:6c56fb4bc5f0 554 (void *) entropy_source_pr, nonce_pers_pr, 16, 32 ) );
nexpaq 0:6c56fb4bc5f0 555 mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
nexpaq 0:6c56fb4bc5f0 556 CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
nexpaq 0:6c56fb4bc5f0 557 CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
nexpaq 0:6c56fb4bc5f0 558 CHK( memcmp( buf, result_pr, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
nexpaq 0:6c56fb4bc5f0 559
nexpaq 0:6c56fb4bc5f0 560 mbedtls_ctr_drbg_free( &ctx );
nexpaq 0:6c56fb4bc5f0 561
nexpaq 0:6c56fb4bc5f0 562 if( verbose != 0 )
nexpaq 0:6c56fb4bc5f0 563 mbedtls_printf( "passed\n" );
nexpaq 0:6c56fb4bc5f0 564
nexpaq 0:6c56fb4bc5f0 565 /*
nexpaq 0:6c56fb4bc5f0 566 * Based on a NIST CTR_DRBG test vector (PR = FALSE)
nexpaq 0:6c56fb4bc5f0 567 */
nexpaq 0:6c56fb4bc5f0 568 if( verbose != 0 )
nexpaq 0:6c56fb4bc5f0 569 mbedtls_printf( " CTR_DRBG (PR = FALSE): " );
nexpaq 0:6c56fb4bc5f0 570
nexpaq 0:6c56fb4bc5f0 571 mbedtls_ctr_drbg_init( &ctx );
nexpaq 0:6c56fb4bc5f0 572
nexpaq 0:6c56fb4bc5f0 573 test_offset = 0;
nexpaq 0:6c56fb4bc5f0 574 CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy,
nexpaq 0:6c56fb4bc5f0 575 (void *) entropy_source_nopr, nonce_pers_nopr, 16, 32 ) );
nexpaq 0:6c56fb4bc5f0 576 CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) );
nexpaq 0:6c56fb4bc5f0 577 CHK( mbedtls_ctr_drbg_reseed( &ctx, NULL, 0 ) );
nexpaq 0:6c56fb4bc5f0 578 CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) );
nexpaq 0:6c56fb4bc5f0 579 CHK( memcmp( buf, result_nopr, 16 ) );
nexpaq 0:6c56fb4bc5f0 580
nexpaq 0:6c56fb4bc5f0 581 mbedtls_ctr_drbg_free( &ctx );
nexpaq 0:6c56fb4bc5f0 582
nexpaq 0:6c56fb4bc5f0 583 if( verbose != 0 )
nexpaq 0:6c56fb4bc5f0 584 mbedtls_printf( "passed\n" );
nexpaq 0:6c56fb4bc5f0 585
nexpaq 0:6c56fb4bc5f0 586 if( verbose != 0 )
nexpaq 0:6c56fb4bc5f0 587 mbedtls_printf( "\n" );
nexpaq 0:6c56fb4bc5f0 588
nexpaq 0:6c56fb4bc5f0 589 return( 0 );
nexpaq 0:6c56fb4bc5f0 590 }
nexpaq 0:6c56fb4bc5f0 591 #endif /* MBEDTLS_SELF_TEST */
nexpaq 0:6c56fb4bc5f0 592
nexpaq 0:6c56fb4bc5f0 593 #endif /* MBEDTLS_CTR_DRBG_C */