sandbox / mbedtls

mbedtls ported to mbed-classic

Fork of mbedtls by Christopher Haster

source/ctr_drbg.c@1:24750b9ad5ef, 2016-01-22 (annotated)

Committer:
Christopher Haster
Date:
Fri Jan 22 16:44:49 2016 -0600
Revision:
1:24750b9ad5ef
Initial move of mbedtls to mercurial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Christopher Haster 1:24750b9ad5ef 1 /*
Christopher Haster 1:24750b9ad5ef 2 * CTR_DRBG implementation based on AES-256 (NIST SP 800-90)
Christopher Haster 1:24750b9ad5ef 3 *
Christopher Haster 1:24750b9ad5ef 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Christopher Haster 1:24750b9ad5ef 5 * SPDX-License-Identifier: Apache-2.0
Christopher Haster 1:24750b9ad5ef 6 *
Christopher Haster 1:24750b9ad5ef 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
Christopher Haster 1:24750b9ad5ef 8 * not use this file except in compliance with the License.
Christopher Haster 1:24750b9ad5ef 9 * You may obtain a copy of the License at
Christopher Haster 1:24750b9ad5ef 10 *
Christopher Haster 1:24750b9ad5ef 11 * http://www.apache.org/licenses/LICENSE-2.0
Christopher Haster 1:24750b9ad5ef 12 *
Christopher Haster 1:24750b9ad5ef 13 * Unless required by applicable law or agreed to in writing, software
Christopher Haster 1:24750b9ad5ef 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
Christopher Haster 1:24750b9ad5ef 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Christopher Haster 1:24750b9ad5ef 16 * See the License for the specific language governing permissions and
Christopher Haster 1:24750b9ad5ef 17 * limitations under the License.
Christopher Haster 1:24750b9ad5ef 18 *
Christopher Haster 1:24750b9ad5ef 19 * This file is part of mbed TLS (https://tls.mbed.org)
Christopher Haster 1:24750b9ad5ef 20 */
Christopher Haster 1:24750b9ad5ef 21 /*
Christopher Haster 1:24750b9ad5ef 22 * The NIST SP 800-90 DRBGs are described in the following publucation.
Christopher Haster 1:24750b9ad5ef 23 *
Christopher Haster 1:24750b9ad5ef 24 * http://csrc.nist.gov/publications/nistpubs/800-90/SP800-90revised_March2007.pdf
Christopher Haster 1:24750b9ad5ef 25 */
Christopher Haster 1:24750b9ad5ef 26
Christopher Haster 1:24750b9ad5ef 27 #if !defined(MBEDTLS_CONFIG_FILE)
Christopher Haster 1:24750b9ad5ef 28 #include "mbedtls/config.h"
Christopher Haster 1:24750b9ad5ef 29 #else
Christopher Haster 1:24750b9ad5ef 30 #include MBEDTLS_CONFIG_FILE
Christopher Haster 1:24750b9ad5ef 31 #endif
Christopher Haster 1:24750b9ad5ef 32
Christopher Haster 1:24750b9ad5ef 33 #if defined(MBEDTLS_CTR_DRBG_C)
Christopher Haster 1:24750b9ad5ef 34
Christopher Haster 1:24750b9ad5ef 35 #include "mbedtls/ctr_drbg.h"
Christopher Haster 1:24750b9ad5ef 36
Christopher Haster 1:24750b9ad5ef 37 #include <string.h>
Christopher Haster 1:24750b9ad5ef 38
Christopher Haster 1:24750b9ad5ef 39 #if defined(MBEDTLS_FS_IO)
Christopher Haster 1:24750b9ad5ef 40 #include <stdio.h>
Christopher Haster 1:24750b9ad5ef 41 #endif
Christopher Haster 1:24750b9ad5ef 42
Christopher Haster 1:24750b9ad5ef 43 #if defined(MBEDTLS_SELF_TEST)
Christopher Haster 1:24750b9ad5ef 44 #if defined(MBEDTLS_PLATFORM_C)
Christopher Haster 1:24750b9ad5ef 45 #include "mbedtls/platform.h"
Christopher Haster 1:24750b9ad5ef 46 #else
Christopher Haster 1:24750b9ad5ef 47 #include <stdio.h>
Christopher Haster 1:24750b9ad5ef 48 #define mbedtls_printf printf
Christopher Haster 1:24750b9ad5ef 49 #endif /* MBEDTLS_PLATFORM_C */
Christopher Haster 1:24750b9ad5ef 50 #endif /* MBEDTLS_SELF_TEST */
Christopher Haster 1:24750b9ad5ef 51
Christopher Haster 1:24750b9ad5ef 52 /* Implementation that should never be optimized out by the compiler */
Christopher Haster 1:24750b9ad5ef 53 static void mbedtls_zeroize( void *v, size_t n ) {
Christopher Haster 1:24750b9ad5ef 54 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
Christopher Haster 1:24750b9ad5ef 55 }
Christopher Haster 1:24750b9ad5ef 56
Christopher Haster 1:24750b9ad5ef 57 /*
Christopher Haster 1:24750b9ad5ef 58 * CTR_DRBG context initialization
Christopher Haster 1:24750b9ad5ef 59 */
Christopher Haster 1:24750b9ad5ef 60 void mbedtls_ctr_drbg_init( mbedtls_ctr_drbg_context *ctx )
Christopher Haster 1:24750b9ad5ef 61 {
Christopher Haster 1:24750b9ad5ef 62 memset( ctx, 0, sizeof( mbedtls_ctr_drbg_context ) );
Christopher Haster 1:24750b9ad5ef 63
Christopher Haster 1:24750b9ad5ef 64 #if defined(MBEDTLS_THREADING_C)
Christopher Haster 1:24750b9ad5ef 65 mbedtls_mutex_init( &ctx->mutex );
Christopher Haster 1:24750b9ad5ef 66 #endif
Christopher Haster 1:24750b9ad5ef 67 }
Christopher Haster 1:24750b9ad5ef 68
Christopher Haster 1:24750b9ad5ef 69 /*
Christopher Haster 1:24750b9ad5ef 70 * Non-public function wrapped by ctr_crbg_init(). Necessary to allow NIST
Christopher Haster 1:24750b9ad5ef 71 * tests to succeed (which require known length fixed entropy)
Christopher Haster 1:24750b9ad5ef 72 */
Christopher Haster 1:24750b9ad5ef 73 int mbedtls_ctr_drbg_seed_entropy_len(
Christopher Haster 1:24750b9ad5ef 74 mbedtls_ctr_drbg_context *ctx,
Christopher Haster 1:24750b9ad5ef 75 int (*f_entropy)(void *, unsigned char *, size_t),
Christopher Haster 1:24750b9ad5ef 76 void *p_entropy,
Christopher Haster 1:24750b9ad5ef 77 const unsigned char *custom,
Christopher Haster 1:24750b9ad5ef 78 size_t len,
Christopher Haster 1:24750b9ad5ef 79 size_t entropy_len )
Christopher Haster 1:24750b9ad5ef 80 {
Christopher Haster 1:24750b9ad5ef 81 int ret;
Christopher Haster 1:24750b9ad5ef 82 unsigned char key[MBEDTLS_CTR_DRBG_KEYSIZE];
Christopher Haster 1:24750b9ad5ef 83
Christopher Haster 1:24750b9ad5ef 84 memset( key, 0, MBEDTLS_CTR_DRBG_KEYSIZE );
Christopher Haster 1:24750b9ad5ef 85
Christopher Haster 1:24750b9ad5ef 86 mbedtls_aes_init( &ctx->aes_ctx );
Christopher Haster 1:24750b9ad5ef 87
Christopher Haster 1:24750b9ad5ef 88 ctx->f_entropy = f_entropy;
Christopher Haster 1:24750b9ad5ef 89 ctx->p_entropy = p_entropy;
Christopher Haster 1:24750b9ad5ef 90
Christopher Haster 1:24750b9ad5ef 91 ctx->entropy_len = entropy_len;
Christopher Haster 1:24750b9ad5ef 92 ctx->reseed_interval = MBEDTLS_CTR_DRBG_RESEED_INTERVAL;
Christopher Haster 1:24750b9ad5ef 93
Christopher Haster 1:24750b9ad5ef 94 /*
Christopher Haster 1:24750b9ad5ef 95 * Initialize with an empty key
Christopher Haster 1:24750b9ad5ef 96 */
Christopher Haster 1:24750b9ad5ef 97 mbedtls_aes_setkey_enc( &ctx->aes_ctx, key, MBEDTLS_CTR_DRBG_KEYBITS );
Christopher Haster 1:24750b9ad5ef 98
Christopher Haster 1:24750b9ad5ef 99 if( ( ret = mbedtls_ctr_drbg_reseed( ctx, custom, len ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 100 return( ret );
Christopher Haster 1:24750b9ad5ef 101
Christopher Haster 1:24750b9ad5ef 102 return( 0 );
Christopher Haster 1:24750b9ad5ef 103 }
Christopher Haster 1:24750b9ad5ef 104
Christopher Haster 1:24750b9ad5ef 105 int mbedtls_ctr_drbg_seed( mbedtls_ctr_drbg_context *ctx,
Christopher Haster 1:24750b9ad5ef 106 int (*f_entropy)(void *, unsigned char *, size_t),
Christopher Haster 1:24750b9ad5ef 107 void *p_entropy,
Christopher Haster 1:24750b9ad5ef 108 const unsigned char *custom,
Christopher Haster 1:24750b9ad5ef 109 size_t len )
Christopher Haster 1:24750b9ad5ef 110 {
Christopher Haster 1:24750b9ad5ef 111 return( mbedtls_ctr_drbg_seed_entropy_len( ctx, f_entropy, p_entropy, custom, len,
Christopher Haster 1:24750b9ad5ef 112 MBEDTLS_CTR_DRBG_ENTROPY_LEN ) );
Christopher Haster 1:24750b9ad5ef 113 }
Christopher Haster 1:24750b9ad5ef 114
Christopher Haster 1:24750b9ad5ef 115 void mbedtls_ctr_drbg_free( mbedtls_ctr_drbg_context *ctx )
Christopher Haster 1:24750b9ad5ef 116 {
Christopher Haster 1:24750b9ad5ef 117 if( ctx == NULL )
Christopher Haster 1:24750b9ad5ef 118 return;
Christopher Haster 1:24750b9ad5ef 119
Christopher Haster 1:24750b9ad5ef 120 #if defined(MBEDTLS_THREADING_C)
Christopher Haster 1:24750b9ad5ef 121 mbedtls_mutex_free( &ctx->mutex );
Christopher Haster 1:24750b9ad5ef 122 #endif
Christopher Haster 1:24750b9ad5ef 123 mbedtls_aes_free( &ctx->aes_ctx );
Christopher Haster 1:24750b9ad5ef 124 mbedtls_zeroize( ctx, sizeof( mbedtls_ctr_drbg_context ) );
Christopher Haster 1:24750b9ad5ef 125 }
Christopher Haster 1:24750b9ad5ef 126
Christopher Haster 1:24750b9ad5ef 127 void mbedtls_ctr_drbg_set_prediction_resistance( mbedtls_ctr_drbg_context *ctx, int resistance )
Christopher Haster 1:24750b9ad5ef 128 {
Christopher Haster 1:24750b9ad5ef 129 ctx->prediction_resistance = resistance;
Christopher Haster 1:24750b9ad5ef 130 }
Christopher Haster 1:24750b9ad5ef 131
Christopher Haster 1:24750b9ad5ef 132 void mbedtls_ctr_drbg_set_entropy_len( mbedtls_ctr_drbg_context *ctx, size_t len )
Christopher Haster 1:24750b9ad5ef 133 {
Christopher Haster 1:24750b9ad5ef 134 ctx->entropy_len = len;
Christopher Haster 1:24750b9ad5ef 135 }
Christopher Haster 1:24750b9ad5ef 136
Christopher Haster 1:24750b9ad5ef 137 void mbedtls_ctr_drbg_set_reseed_interval( mbedtls_ctr_drbg_context *ctx, int interval )
Christopher Haster 1:24750b9ad5ef 138 {
Christopher Haster 1:24750b9ad5ef 139 ctx->reseed_interval = interval;
Christopher Haster 1:24750b9ad5ef 140 }
Christopher Haster 1:24750b9ad5ef 141
Christopher Haster 1:24750b9ad5ef 142 static int block_cipher_df( unsigned char *output,
Christopher Haster 1:24750b9ad5ef 143 const unsigned char *data, size_t data_len )
Christopher Haster 1:24750b9ad5ef 144 {
Christopher Haster 1:24750b9ad5ef 145 unsigned char buf[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16];
Christopher Haster 1:24750b9ad5ef 146 unsigned char tmp[MBEDTLS_CTR_DRBG_SEEDLEN];
Christopher Haster 1:24750b9ad5ef 147 unsigned char key[MBEDTLS_CTR_DRBG_KEYSIZE];
Christopher Haster 1:24750b9ad5ef 148 unsigned char chain[MBEDTLS_CTR_DRBG_BLOCKSIZE];
Christopher Haster 1:24750b9ad5ef 149 unsigned char *p, *iv;
Christopher Haster 1:24750b9ad5ef 150 mbedtls_aes_context aes_ctx;
Christopher Haster 1:24750b9ad5ef 151
Christopher Haster 1:24750b9ad5ef 152 int i, j;
Christopher Haster 1:24750b9ad5ef 153 size_t buf_len, use_len;
Christopher Haster 1:24750b9ad5ef 154
Christopher Haster 1:24750b9ad5ef 155 if( data_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
Christopher Haster 1:24750b9ad5ef 156 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
Christopher Haster 1:24750b9ad5ef 157
Christopher Haster 1:24750b9ad5ef 158 memset( buf, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16 );
Christopher Haster 1:24750b9ad5ef 159 mbedtls_aes_init( &aes_ctx );
Christopher Haster 1:24750b9ad5ef 160
Christopher Haster 1:24750b9ad5ef 161 /*
Christopher Haster 1:24750b9ad5ef 162 * Construct IV (16 bytes) and S in buffer
Christopher Haster 1:24750b9ad5ef 163 * IV = Counter (in 32-bits) padded to 16 with zeroes
Christopher Haster 1:24750b9ad5ef 164 * S = Length input string (in 32-bits) || Length of output (in 32-bits) ||
Christopher Haster 1:24750b9ad5ef 165 * data || 0x80
Christopher Haster 1:24750b9ad5ef 166 * (Total is padded to a multiple of 16-bytes with zeroes)
Christopher Haster 1:24750b9ad5ef 167 */
Christopher Haster 1:24750b9ad5ef 168 p = buf + MBEDTLS_CTR_DRBG_BLOCKSIZE;
Christopher Haster 1:24750b9ad5ef 169 *p++ = ( data_len >> 24 ) & 0xff;
Christopher Haster 1:24750b9ad5ef 170 *p++ = ( data_len >> 16 ) & 0xff;
Christopher Haster 1:24750b9ad5ef 171 *p++ = ( data_len >> 8 ) & 0xff;
Christopher Haster 1:24750b9ad5ef 172 *p++ = ( data_len ) & 0xff;
Christopher Haster 1:24750b9ad5ef 173 p += 3;
Christopher Haster 1:24750b9ad5ef 174 *p++ = MBEDTLS_CTR_DRBG_SEEDLEN;
Christopher Haster 1:24750b9ad5ef 175 memcpy( p, data, data_len );
Christopher Haster 1:24750b9ad5ef 176 p[data_len] = 0x80;
Christopher Haster 1:24750b9ad5ef 177
Christopher Haster 1:24750b9ad5ef 178 buf_len = MBEDTLS_CTR_DRBG_BLOCKSIZE + 8 + data_len + 1;
Christopher Haster 1:24750b9ad5ef 179
Christopher Haster 1:24750b9ad5ef 180 for( i = 0; i < MBEDTLS_CTR_DRBG_KEYSIZE; i++ )
Christopher Haster 1:24750b9ad5ef 181 key[i] = i;
Christopher Haster 1:24750b9ad5ef 182
Christopher Haster 1:24750b9ad5ef 183 mbedtls_aes_setkey_enc( &aes_ctx, key, MBEDTLS_CTR_DRBG_KEYBITS );
Christopher Haster 1:24750b9ad5ef 184
Christopher Haster 1:24750b9ad5ef 185 /*
Christopher Haster 1:24750b9ad5ef 186 * Reduce data to MBEDTLS_CTR_DRBG_SEEDLEN bytes of data
Christopher Haster 1:24750b9ad5ef 187 */
Christopher Haster 1:24750b9ad5ef 188 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
Christopher Haster 1:24750b9ad5ef 189 {
Christopher Haster 1:24750b9ad5ef 190 p = buf;
Christopher Haster 1:24750b9ad5ef 191 memset( chain, 0, MBEDTLS_CTR_DRBG_BLOCKSIZE );
Christopher Haster 1:24750b9ad5ef 192 use_len = buf_len;
Christopher Haster 1:24750b9ad5ef 193
Christopher Haster 1:24750b9ad5ef 194 while( use_len > 0 )
Christopher Haster 1:24750b9ad5ef 195 {
Christopher Haster 1:24750b9ad5ef 196 for( i = 0; i < MBEDTLS_CTR_DRBG_BLOCKSIZE; i++ )
Christopher Haster 1:24750b9ad5ef 197 chain[i] ^= p[i];
Christopher Haster 1:24750b9ad5ef 198 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
Christopher Haster 1:24750b9ad5ef 199 use_len -= ( use_len >= MBEDTLS_CTR_DRBG_BLOCKSIZE ) ?
Christopher Haster 1:24750b9ad5ef 200 MBEDTLS_CTR_DRBG_BLOCKSIZE : use_len;
Christopher Haster 1:24750b9ad5ef 201
Christopher Haster 1:24750b9ad5ef 202 mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, chain, chain );
Christopher Haster 1:24750b9ad5ef 203 }
Christopher Haster 1:24750b9ad5ef 204
Christopher Haster 1:24750b9ad5ef 205 memcpy( tmp + j, chain, MBEDTLS_CTR_DRBG_BLOCKSIZE );
Christopher Haster 1:24750b9ad5ef 206
Christopher Haster 1:24750b9ad5ef 207 /*
Christopher Haster 1:24750b9ad5ef 208 * Update IV
Christopher Haster 1:24750b9ad5ef 209 */
Christopher Haster 1:24750b9ad5ef 210 buf[3]++;
Christopher Haster 1:24750b9ad5ef 211 }
Christopher Haster 1:24750b9ad5ef 212
Christopher Haster 1:24750b9ad5ef 213 /*
Christopher Haster 1:24750b9ad5ef 214 * Do final encryption with reduced data
Christopher Haster 1:24750b9ad5ef 215 */
Christopher Haster 1:24750b9ad5ef 216 mbedtls_aes_setkey_enc( &aes_ctx, tmp, MBEDTLS_CTR_DRBG_KEYBITS );
Christopher Haster 1:24750b9ad5ef 217 iv = tmp + MBEDTLS_CTR_DRBG_KEYSIZE;
Christopher Haster 1:24750b9ad5ef 218 p = output;
Christopher Haster 1:24750b9ad5ef 219
Christopher Haster 1:24750b9ad5ef 220 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
Christopher Haster 1:24750b9ad5ef 221 {
Christopher Haster 1:24750b9ad5ef 222 mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, iv, iv );
Christopher Haster 1:24750b9ad5ef 223 memcpy( p, iv, MBEDTLS_CTR_DRBG_BLOCKSIZE );
Christopher Haster 1:24750b9ad5ef 224 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
Christopher Haster 1:24750b9ad5ef 225 }
Christopher Haster 1:24750b9ad5ef 226
Christopher Haster 1:24750b9ad5ef 227 mbedtls_aes_free( &aes_ctx );
Christopher Haster 1:24750b9ad5ef 228
Christopher Haster 1:24750b9ad5ef 229 return( 0 );
Christopher Haster 1:24750b9ad5ef 230 }
Christopher Haster 1:24750b9ad5ef 231
Christopher Haster 1:24750b9ad5ef 232 static int ctr_drbg_update_internal( mbedtls_ctr_drbg_context *ctx,
Christopher Haster 1:24750b9ad5ef 233 const unsigned char data[MBEDTLS_CTR_DRBG_SEEDLEN] )
Christopher Haster 1:24750b9ad5ef 234 {
Christopher Haster 1:24750b9ad5ef 235 unsigned char tmp[MBEDTLS_CTR_DRBG_SEEDLEN];
Christopher Haster 1:24750b9ad5ef 236 unsigned char *p = tmp;
Christopher Haster 1:24750b9ad5ef 237 int i, j;
Christopher Haster 1:24750b9ad5ef 238
Christopher Haster 1:24750b9ad5ef 239 memset( tmp, 0, MBEDTLS_CTR_DRBG_SEEDLEN );
Christopher Haster 1:24750b9ad5ef 240
Christopher Haster 1:24750b9ad5ef 241 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
Christopher Haster 1:24750b9ad5ef 242 {
Christopher Haster 1:24750b9ad5ef 243 /*
Christopher Haster 1:24750b9ad5ef 244 * Increase counter
Christopher Haster 1:24750b9ad5ef 245 */
Christopher Haster 1:24750b9ad5ef 246 for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- )
Christopher Haster 1:24750b9ad5ef 247 if( ++ctx->counter[i - 1] != 0 )
Christopher Haster 1:24750b9ad5ef 248 break;
Christopher Haster 1:24750b9ad5ef 249
Christopher Haster 1:24750b9ad5ef 250 /*
Christopher Haster 1:24750b9ad5ef 251 * Crypt counter block
Christopher Haster 1:24750b9ad5ef 252 */
Christopher Haster 1:24750b9ad5ef 253 mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, ctx->counter, p );
Christopher Haster 1:24750b9ad5ef 254
Christopher Haster 1:24750b9ad5ef 255 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
Christopher Haster 1:24750b9ad5ef 256 }
Christopher Haster 1:24750b9ad5ef 257
Christopher Haster 1:24750b9ad5ef 258 for( i = 0; i < MBEDTLS_CTR_DRBG_SEEDLEN; i++ )
Christopher Haster 1:24750b9ad5ef 259 tmp[i] ^= data[i];
Christopher Haster 1:24750b9ad5ef 260
Christopher Haster 1:24750b9ad5ef 261 /*
Christopher Haster 1:24750b9ad5ef 262 * Update key and counter
Christopher Haster 1:24750b9ad5ef 263 */
Christopher Haster 1:24750b9ad5ef 264 mbedtls_aes_setkey_enc( &ctx->aes_ctx, tmp, MBEDTLS_CTR_DRBG_KEYBITS );
Christopher Haster 1:24750b9ad5ef 265 memcpy( ctx->counter, tmp + MBEDTLS_CTR_DRBG_KEYSIZE, MBEDTLS_CTR_DRBG_BLOCKSIZE );
Christopher Haster 1:24750b9ad5ef 266
Christopher Haster 1:24750b9ad5ef 267 return( 0 );
Christopher Haster 1:24750b9ad5ef 268 }
Christopher Haster 1:24750b9ad5ef 269
Christopher Haster 1:24750b9ad5ef 270 void mbedtls_ctr_drbg_update( mbedtls_ctr_drbg_context *ctx,
Christopher Haster 1:24750b9ad5ef 271 const unsigned char *additional, size_t add_len )
Christopher Haster 1:24750b9ad5ef 272 {
Christopher Haster 1:24750b9ad5ef 273 unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN];
Christopher Haster 1:24750b9ad5ef 274
Christopher Haster 1:24750b9ad5ef 275 if( add_len > 0 )
Christopher Haster 1:24750b9ad5ef 276 {
Christopher Haster 1:24750b9ad5ef 277 /* MAX_INPUT would be more logical here, but we have to match
Christopher Haster 1:24750b9ad5ef 278 * block_cipher_df()'s limits since we can't propagate errors */
Christopher Haster 1:24750b9ad5ef 279 if( add_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
Christopher Haster 1:24750b9ad5ef 280 add_len = MBEDTLS_CTR_DRBG_MAX_SEED_INPUT;
Christopher Haster 1:24750b9ad5ef 281
Christopher Haster 1:24750b9ad5ef 282 block_cipher_df( add_input, additional, add_len );
Christopher Haster 1:24750b9ad5ef 283 ctr_drbg_update_internal( ctx, add_input );
Christopher Haster 1:24750b9ad5ef 284 }
Christopher Haster 1:24750b9ad5ef 285 }
Christopher Haster 1:24750b9ad5ef 286
Christopher Haster 1:24750b9ad5ef 287 int mbedtls_ctr_drbg_reseed( mbedtls_ctr_drbg_context *ctx,
Christopher Haster 1:24750b9ad5ef 288 const unsigned char *additional, size_t len )
Christopher Haster 1:24750b9ad5ef 289 {
Christopher Haster 1:24750b9ad5ef 290 unsigned char seed[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT];
Christopher Haster 1:24750b9ad5ef 291 size_t seedlen = 0;
Christopher Haster 1:24750b9ad5ef 292
Christopher Haster 1:24750b9ad5ef 293 if( ctx->entropy_len + len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
Christopher Haster 1:24750b9ad5ef 294 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
Christopher Haster 1:24750b9ad5ef 295
Christopher Haster 1:24750b9ad5ef 296 memset( seed, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT );
Christopher Haster 1:24750b9ad5ef 297
Christopher Haster 1:24750b9ad5ef 298 /*
Christopher Haster 1:24750b9ad5ef 299 * Gather entropy_len bytes of entropy to seed state
Christopher Haster 1:24750b9ad5ef 300 */
Christopher Haster 1:24750b9ad5ef 301 if( 0 != ctx->f_entropy( ctx->p_entropy, seed,
Christopher Haster 1:24750b9ad5ef 302 ctx->entropy_len ) )
Christopher Haster 1:24750b9ad5ef 303 {
Christopher Haster 1:24750b9ad5ef 304 return( MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED );
Christopher Haster 1:24750b9ad5ef 305 }
Christopher Haster 1:24750b9ad5ef 306
Christopher Haster 1:24750b9ad5ef 307 seedlen += ctx->entropy_len;
Christopher Haster 1:24750b9ad5ef 308
Christopher Haster 1:24750b9ad5ef 309 /*
Christopher Haster 1:24750b9ad5ef 310 * Add additional data
Christopher Haster 1:24750b9ad5ef 311 */
Christopher Haster 1:24750b9ad5ef 312 if( additional && len )
Christopher Haster 1:24750b9ad5ef 313 {
Christopher Haster 1:24750b9ad5ef 314 memcpy( seed + seedlen, additional, len );
Christopher Haster 1:24750b9ad5ef 315 seedlen += len;
Christopher Haster 1:24750b9ad5ef 316 }
Christopher Haster 1:24750b9ad5ef 317
Christopher Haster 1:24750b9ad5ef 318 /*
Christopher Haster 1:24750b9ad5ef 319 * Reduce to 384 bits
Christopher Haster 1:24750b9ad5ef 320 */
Christopher Haster 1:24750b9ad5ef 321 block_cipher_df( seed, seed, seedlen );
Christopher Haster 1:24750b9ad5ef 322
Christopher Haster 1:24750b9ad5ef 323 /*
Christopher Haster 1:24750b9ad5ef 324 * Update state
Christopher Haster 1:24750b9ad5ef 325 */
Christopher Haster 1:24750b9ad5ef 326 ctr_drbg_update_internal( ctx, seed );
Christopher Haster 1:24750b9ad5ef 327 ctx->reseed_counter = 1;
Christopher Haster 1:24750b9ad5ef 328
Christopher Haster 1:24750b9ad5ef 329 return( 0 );
Christopher Haster 1:24750b9ad5ef 330 }
Christopher Haster 1:24750b9ad5ef 331
Christopher Haster 1:24750b9ad5ef 332 int mbedtls_ctr_drbg_random_with_add( void *p_rng,
Christopher Haster 1:24750b9ad5ef 333 unsigned char *output, size_t output_len,
Christopher Haster 1:24750b9ad5ef 334 const unsigned char *additional, size_t add_len )
Christopher Haster 1:24750b9ad5ef 335 {
Christopher Haster 1:24750b9ad5ef 336 int ret = 0;
Christopher Haster 1:24750b9ad5ef 337 mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng;
Christopher Haster 1:24750b9ad5ef 338 unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN];
Christopher Haster 1:24750b9ad5ef 339 unsigned char *p = output;
Christopher Haster 1:24750b9ad5ef 340 unsigned char tmp[MBEDTLS_CTR_DRBG_BLOCKSIZE];
Christopher Haster 1:24750b9ad5ef 341 int i;
Christopher Haster 1:24750b9ad5ef 342 size_t use_len;
Christopher Haster 1:24750b9ad5ef 343
Christopher Haster 1:24750b9ad5ef 344 if( output_len > MBEDTLS_CTR_DRBG_MAX_REQUEST )
Christopher Haster 1:24750b9ad5ef 345 return( MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG );
Christopher Haster 1:24750b9ad5ef 346
Christopher Haster 1:24750b9ad5ef 347 if( add_len > MBEDTLS_CTR_DRBG_MAX_INPUT )
Christopher Haster 1:24750b9ad5ef 348 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
Christopher Haster 1:24750b9ad5ef 349
Christopher Haster 1:24750b9ad5ef 350 memset( add_input, 0, MBEDTLS_CTR_DRBG_SEEDLEN );
Christopher Haster 1:24750b9ad5ef 351
Christopher Haster 1:24750b9ad5ef 352 if( ctx->reseed_counter > ctx->reseed_interval ||
Christopher Haster 1:24750b9ad5ef 353 ctx->prediction_resistance )
Christopher Haster 1:24750b9ad5ef 354 {
Christopher Haster 1:24750b9ad5ef 355 if( ( ret = mbedtls_ctr_drbg_reseed( ctx, additional, add_len ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 356 return( ret );
Christopher Haster 1:24750b9ad5ef 357
Christopher Haster 1:24750b9ad5ef 358 add_len = 0;
Christopher Haster 1:24750b9ad5ef 359 }
Christopher Haster 1:24750b9ad5ef 360
Christopher Haster 1:24750b9ad5ef 361 if( add_len > 0 )
Christopher Haster 1:24750b9ad5ef 362 {
Christopher Haster 1:24750b9ad5ef 363 block_cipher_df( add_input, additional, add_len );
Christopher Haster 1:24750b9ad5ef 364 ctr_drbg_update_internal( ctx, add_input );
Christopher Haster 1:24750b9ad5ef 365 }
Christopher Haster 1:24750b9ad5ef 366
Christopher Haster 1:24750b9ad5ef 367 while( output_len > 0 )
Christopher Haster 1:24750b9ad5ef 368 {
Christopher Haster 1:24750b9ad5ef 369 /*
Christopher Haster 1:24750b9ad5ef 370 * Increase counter
Christopher Haster 1:24750b9ad5ef 371 */
Christopher Haster 1:24750b9ad5ef 372 for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- )
Christopher Haster 1:24750b9ad5ef 373 if( ++ctx->counter[i - 1] != 0 )
Christopher Haster 1:24750b9ad5ef 374 break;
Christopher Haster 1:24750b9ad5ef 375
Christopher Haster 1:24750b9ad5ef 376 /*
Christopher Haster 1:24750b9ad5ef 377 * Crypt counter block
Christopher Haster 1:24750b9ad5ef 378 */
Christopher Haster 1:24750b9ad5ef 379 mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, ctx->counter, tmp );
Christopher Haster 1:24750b9ad5ef 380
Christopher Haster 1:24750b9ad5ef 381 use_len = ( output_len > MBEDTLS_CTR_DRBG_BLOCKSIZE ) ? MBEDTLS_CTR_DRBG_BLOCKSIZE :
Christopher Haster 1:24750b9ad5ef 382 output_len;
Christopher Haster 1:24750b9ad5ef 383 /*
Christopher Haster 1:24750b9ad5ef 384 * Copy random block to destination
Christopher Haster 1:24750b9ad5ef 385 */
Christopher Haster 1:24750b9ad5ef 386 memcpy( p, tmp, use_len );
Christopher Haster 1:24750b9ad5ef 387 p += use_len;
Christopher Haster 1:24750b9ad5ef 388 output_len -= use_len;
Christopher Haster 1:24750b9ad5ef 389 }
Christopher Haster 1:24750b9ad5ef 390
Christopher Haster 1:24750b9ad5ef 391 ctr_drbg_update_internal( ctx, add_input );
Christopher Haster 1:24750b9ad5ef 392
Christopher Haster 1:24750b9ad5ef 393 ctx->reseed_counter++;
Christopher Haster 1:24750b9ad5ef 394
Christopher Haster 1:24750b9ad5ef 395 return( 0 );
Christopher Haster 1:24750b9ad5ef 396 }
Christopher Haster 1:24750b9ad5ef 397
Christopher Haster 1:24750b9ad5ef 398 int mbedtls_ctr_drbg_random( void *p_rng, unsigned char *output, size_t output_len )
Christopher Haster 1:24750b9ad5ef 399 {
Christopher Haster 1:24750b9ad5ef 400 int ret;
Christopher Haster 1:24750b9ad5ef 401 mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng;
Christopher Haster 1:24750b9ad5ef 402
Christopher Haster 1:24750b9ad5ef 403 #if defined(MBEDTLS_THREADING_C)
Christopher Haster 1:24750b9ad5ef 404 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 405 return( ret );
Christopher Haster 1:24750b9ad5ef 406 #endif
Christopher Haster 1:24750b9ad5ef 407
Christopher Haster 1:24750b9ad5ef 408 ret = mbedtls_ctr_drbg_random_with_add( ctx, output, output_len, NULL, 0 );
Christopher Haster 1:24750b9ad5ef 409
Christopher Haster 1:24750b9ad5ef 410 #if defined(MBEDTLS_THREADING_C)
Christopher Haster 1:24750b9ad5ef 411 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
Christopher Haster 1:24750b9ad5ef 412 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
Christopher Haster 1:24750b9ad5ef 413 #endif
Christopher Haster 1:24750b9ad5ef 414
Christopher Haster 1:24750b9ad5ef 415 return( ret );
Christopher Haster 1:24750b9ad5ef 416 }
Christopher Haster 1:24750b9ad5ef 417
Christopher Haster 1:24750b9ad5ef 418 #if defined(MBEDTLS_FS_IO)
Christopher Haster 1:24750b9ad5ef 419 int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path )
Christopher Haster 1:24750b9ad5ef 420 {
Christopher Haster 1:24750b9ad5ef 421 int ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR;
Christopher Haster 1:24750b9ad5ef 422 FILE *f;
Christopher Haster 1:24750b9ad5ef 423 unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ];
Christopher Haster 1:24750b9ad5ef 424
Christopher Haster 1:24750b9ad5ef 425 if( ( f = fopen( path, "wb" ) ) == NULL )
Christopher Haster 1:24750b9ad5ef 426 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
Christopher Haster 1:24750b9ad5ef 427
Christopher Haster 1:24750b9ad5ef 428 if( ( ret = mbedtls_ctr_drbg_random( ctx, buf, MBEDTLS_CTR_DRBG_MAX_INPUT ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 429 goto exit;
Christopher Haster 1:24750b9ad5ef 430
Christopher Haster 1:24750b9ad5ef 431 if( fwrite( buf, 1, MBEDTLS_CTR_DRBG_MAX_INPUT, f ) != MBEDTLS_CTR_DRBG_MAX_INPUT )
Christopher Haster 1:24750b9ad5ef 432 {
Christopher Haster 1:24750b9ad5ef 433 ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR;
Christopher Haster 1:24750b9ad5ef 434 goto exit;
Christopher Haster 1:24750b9ad5ef 435 }
Christopher Haster 1:24750b9ad5ef 436
Christopher Haster 1:24750b9ad5ef 437 ret = 0;
Christopher Haster 1:24750b9ad5ef 438
Christopher Haster 1:24750b9ad5ef 439 exit:
Christopher Haster 1:24750b9ad5ef 440 fclose( f );
Christopher Haster 1:24750b9ad5ef 441 return( ret );
Christopher Haster 1:24750b9ad5ef 442 }
Christopher Haster 1:24750b9ad5ef 443
Christopher Haster 1:24750b9ad5ef 444 int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path )
Christopher Haster 1:24750b9ad5ef 445 {
Christopher Haster 1:24750b9ad5ef 446 FILE *f;
Christopher Haster 1:24750b9ad5ef 447 size_t n;
Christopher Haster 1:24750b9ad5ef 448 unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ];
Christopher Haster 1:24750b9ad5ef 449
Christopher Haster 1:24750b9ad5ef 450 if( ( f = fopen( path, "rb" ) ) == NULL )
Christopher Haster 1:24750b9ad5ef 451 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
Christopher Haster 1:24750b9ad5ef 452
Christopher Haster 1:24750b9ad5ef 453 fseek( f, 0, SEEK_END );
Christopher Haster 1:24750b9ad5ef 454 n = (size_t) ftell( f );
Christopher Haster 1:24750b9ad5ef 455 fseek( f, 0, SEEK_SET );
Christopher Haster 1:24750b9ad5ef 456
Christopher Haster 1:24750b9ad5ef 457 if( n > MBEDTLS_CTR_DRBG_MAX_INPUT )
Christopher Haster 1:24750b9ad5ef 458 {
Christopher Haster 1:24750b9ad5ef 459 fclose( f );
Christopher Haster 1:24750b9ad5ef 460 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
Christopher Haster 1:24750b9ad5ef 461 }
Christopher Haster 1:24750b9ad5ef 462
Christopher Haster 1:24750b9ad5ef 463 if( fread( buf, 1, n, f ) != n )
Christopher Haster 1:24750b9ad5ef 464 {
Christopher Haster 1:24750b9ad5ef 465 fclose( f );
Christopher Haster 1:24750b9ad5ef 466 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
Christopher Haster 1:24750b9ad5ef 467 }
Christopher Haster 1:24750b9ad5ef 468
Christopher Haster 1:24750b9ad5ef 469 fclose( f );
Christopher Haster 1:24750b9ad5ef 470
Christopher Haster 1:24750b9ad5ef 471 mbedtls_ctr_drbg_update( ctx, buf, n );
Christopher Haster 1:24750b9ad5ef 472
Christopher Haster 1:24750b9ad5ef 473 return( mbedtls_ctr_drbg_write_seed_file( ctx, path ) );
Christopher Haster 1:24750b9ad5ef 474 }
Christopher Haster 1:24750b9ad5ef 475 #endif /* MBEDTLS_FS_IO */
Christopher Haster 1:24750b9ad5ef 476
Christopher Haster 1:24750b9ad5ef 477 #if defined(MBEDTLS_SELF_TEST)
Christopher Haster 1:24750b9ad5ef 478
Christopher Haster 1:24750b9ad5ef 479 static const unsigned char entropy_source_pr[96] =
Christopher Haster 1:24750b9ad5ef 480 { 0xc1, 0x80, 0x81, 0xa6, 0x5d, 0x44, 0x02, 0x16,
Christopher Haster 1:24750b9ad5ef 481 0x19, 0xb3, 0xf1, 0x80, 0xb1, 0xc9, 0x20, 0x02,
Christopher Haster 1:24750b9ad5ef 482 0x6a, 0x54, 0x6f, 0x0c, 0x70, 0x81, 0x49, 0x8b,
Christopher Haster 1:24750b9ad5ef 483 0x6e, 0xa6, 0x62, 0x52, 0x6d, 0x51, 0xb1, 0xcb,
Christopher Haster 1:24750b9ad5ef 484 0x58, 0x3b, 0xfa, 0xd5, 0x37, 0x5f, 0xfb, 0xc9,
Christopher Haster 1:24750b9ad5ef 485 0xff, 0x46, 0xd2, 0x19, 0xc7, 0x22, 0x3e, 0x95,
Christopher Haster 1:24750b9ad5ef 486 0x45, 0x9d, 0x82, 0xe1, 0xe7, 0x22, 0x9f, 0x63,
Christopher Haster 1:24750b9ad5ef 487 0x31, 0x69, 0xd2, 0x6b, 0x57, 0x47, 0x4f, 0xa3,
Christopher Haster 1:24750b9ad5ef 488 0x37, 0xc9, 0x98, 0x1c, 0x0b, 0xfb, 0x91, 0x31,
Christopher Haster 1:24750b9ad5ef 489 0x4d, 0x55, 0xb9, 0xe9, 0x1c, 0x5a, 0x5e, 0xe4,
Christopher Haster 1:24750b9ad5ef 490 0x93, 0x92, 0xcf, 0xc5, 0x23, 0x12, 0xd5, 0x56,
Christopher Haster 1:24750b9ad5ef 491 0x2c, 0x4a, 0x6e, 0xff, 0xdc, 0x10, 0xd0, 0x68 };
Christopher Haster 1:24750b9ad5ef 492
Christopher Haster 1:24750b9ad5ef 493 static const unsigned char entropy_source_nopr[64] =
Christopher Haster 1:24750b9ad5ef 494 { 0x5a, 0x19, 0x4d, 0x5e, 0x2b, 0x31, 0x58, 0x14,
Christopher Haster 1:24750b9ad5ef 495 0x54, 0xde, 0xf6, 0x75, 0xfb, 0x79, 0x58, 0xfe,
Christopher Haster 1:24750b9ad5ef 496 0xc7, 0xdb, 0x87, 0x3e, 0x56, 0x89, 0xfc, 0x9d,
Christopher Haster 1:24750b9ad5ef 497 0x03, 0x21, 0x7c, 0x68, 0xd8, 0x03, 0x38, 0x20,
Christopher Haster 1:24750b9ad5ef 498 0xf9, 0xe6, 0x5e, 0x04, 0xd8, 0x56, 0xf3, 0xa9,
Christopher Haster 1:24750b9ad5ef 499 0xc4, 0x4a, 0x4c, 0xbd, 0xc1, 0xd0, 0x08, 0x46,
Christopher Haster 1:24750b9ad5ef 500 0xf5, 0x98, 0x3d, 0x77, 0x1c, 0x1b, 0x13, 0x7e,
Christopher Haster 1:24750b9ad5ef 501 0x4e, 0x0f, 0x9d, 0x8e, 0xf4, 0x09, 0xf9, 0x2e };
Christopher Haster 1:24750b9ad5ef 502
Christopher Haster 1:24750b9ad5ef 503 static const unsigned char nonce_pers_pr[16] =
Christopher Haster 1:24750b9ad5ef 504 { 0xd2, 0x54, 0xfc, 0xff, 0x02, 0x1e, 0x69, 0xd2,
Christopher Haster 1:24750b9ad5ef 505 0x29, 0xc9, 0xcf, 0xad, 0x85, 0xfa, 0x48, 0x6c };
Christopher Haster 1:24750b9ad5ef 506
Christopher Haster 1:24750b9ad5ef 507 static const unsigned char nonce_pers_nopr[16] =
Christopher Haster 1:24750b9ad5ef 508 { 0x1b, 0x54, 0xb8, 0xff, 0x06, 0x42, 0xbf, 0xf5,
Christopher Haster 1:24750b9ad5ef 509 0x21, 0xf1, 0x5c, 0x1c, 0x0b, 0x66, 0x5f, 0x3f };
Christopher Haster 1:24750b9ad5ef 510
Christopher Haster 1:24750b9ad5ef 511 static const unsigned char result_pr[16] =
Christopher Haster 1:24750b9ad5ef 512 { 0x34, 0x01, 0x16, 0x56, 0xb4, 0x29, 0x00, 0x8f,
Christopher Haster 1:24750b9ad5ef 513 0x35, 0x63, 0xec, 0xb5, 0xf2, 0x59, 0x07, 0x23 };
Christopher Haster 1:24750b9ad5ef 514
Christopher Haster 1:24750b9ad5ef 515 static const unsigned char result_nopr[16] =
Christopher Haster 1:24750b9ad5ef 516 { 0xa0, 0x54, 0x30, 0x3d, 0x8a, 0x7e, 0xa9, 0x88,
Christopher Haster 1:24750b9ad5ef 517 0x9d, 0x90, 0x3e, 0x07, 0x7c, 0x6f, 0x21, 0x8f };
Christopher Haster 1:24750b9ad5ef 518
Christopher Haster 1:24750b9ad5ef 519 static size_t test_offset;
Christopher Haster 1:24750b9ad5ef 520 static int ctr_drbg_self_test_entropy( void *data, unsigned char *buf,
Christopher Haster 1:24750b9ad5ef 521 size_t len )
Christopher Haster 1:24750b9ad5ef 522 {
Christopher Haster 1:24750b9ad5ef 523 const unsigned char *p = data;
Christopher Haster 1:24750b9ad5ef 524 memcpy( buf, p + test_offset, len );
Christopher Haster 1:24750b9ad5ef 525 test_offset += len;
Christopher Haster 1:24750b9ad5ef 526 return( 0 );
Christopher Haster 1:24750b9ad5ef 527 }
Christopher Haster 1:24750b9ad5ef 528
Christopher Haster 1:24750b9ad5ef 529 #define CHK( c ) if( (c) != 0 ) \
Christopher Haster 1:24750b9ad5ef 530 { \
Christopher Haster 1:24750b9ad5ef 531 if( verbose != 0 ) \
Christopher Haster 1:24750b9ad5ef 532 mbedtls_printf( "failed\n" ); \
Christopher Haster 1:24750b9ad5ef 533 return( 1 ); \
Christopher Haster 1:24750b9ad5ef 534 }
Christopher Haster 1:24750b9ad5ef 535
Christopher Haster 1:24750b9ad5ef 536 /*
Christopher Haster 1:24750b9ad5ef 537 * Checkup routine
Christopher Haster 1:24750b9ad5ef 538 */
Christopher Haster 1:24750b9ad5ef 539 int mbedtls_ctr_drbg_self_test( int verbose )
Christopher Haster 1:24750b9ad5ef 540 {
Christopher Haster 1:24750b9ad5ef 541 mbedtls_ctr_drbg_context ctx;
Christopher Haster 1:24750b9ad5ef 542 unsigned char buf[16];
Christopher Haster 1:24750b9ad5ef 543
Christopher Haster 1:24750b9ad5ef 544 mbedtls_ctr_drbg_init( &ctx );
Christopher Haster 1:24750b9ad5ef 545
Christopher Haster 1:24750b9ad5ef 546 /*
Christopher Haster 1:24750b9ad5ef 547 * Based on a NIST CTR_DRBG test vector (PR = True)
Christopher Haster 1:24750b9ad5ef 548 */
Christopher Haster 1:24750b9ad5ef 549 if( verbose != 0 )
Christopher Haster 1:24750b9ad5ef 550 mbedtls_printf( " CTR_DRBG (PR = TRUE) : " );
Christopher Haster 1:24750b9ad5ef 551
Christopher Haster 1:24750b9ad5ef 552 test_offset = 0;
Christopher Haster 1:24750b9ad5ef 553 CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy,
Christopher Haster 1:24750b9ad5ef 554 (void *) entropy_source_pr, nonce_pers_pr, 16, 32 ) );
Christopher Haster 1:24750b9ad5ef 555 mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
Christopher Haster 1:24750b9ad5ef 556 CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
Christopher Haster 1:24750b9ad5ef 557 CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
Christopher Haster 1:24750b9ad5ef 558 CHK( memcmp( buf, result_pr, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
Christopher Haster 1:24750b9ad5ef 559
Christopher Haster 1:24750b9ad5ef 560 mbedtls_ctr_drbg_free( &ctx );
Christopher Haster 1:24750b9ad5ef 561
Christopher Haster 1:24750b9ad5ef 562 if( verbose != 0 )
Christopher Haster 1:24750b9ad5ef 563 mbedtls_printf( "passed\n" );
Christopher Haster 1:24750b9ad5ef 564
Christopher Haster 1:24750b9ad5ef 565 /*
Christopher Haster 1:24750b9ad5ef 566 * Based on a NIST CTR_DRBG test vector (PR = FALSE)
Christopher Haster 1:24750b9ad5ef 567 */
Christopher Haster 1:24750b9ad5ef 568 if( verbose != 0 )
Christopher Haster 1:24750b9ad5ef 569 mbedtls_printf( " CTR_DRBG (PR = FALSE): " );
Christopher Haster 1:24750b9ad5ef 570
Christopher Haster 1:24750b9ad5ef 571 mbedtls_ctr_drbg_init( &ctx );
Christopher Haster 1:24750b9ad5ef 572
Christopher Haster 1:24750b9ad5ef 573 test_offset = 0;
Christopher Haster 1:24750b9ad5ef 574 CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy,
Christopher Haster 1:24750b9ad5ef 575 (void *) entropy_source_nopr, nonce_pers_nopr, 16, 32 ) );
Christopher Haster 1:24750b9ad5ef 576 CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) );
Christopher Haster 1:24750b9ad5ef 577 CHK( mbedtls_ctr_drbg_reseed( &ctx, NULL, 0 ) );
Christopher Haster 1:24750b9ad5ef 578 CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) );
Christopher Haster 1:24750b9ad5ef 579 CHK( memcmp( buf, result_nopr, 16 ) );
Christopher Haster 1:24750b9ad5ef 580
Christopher Haster 1:24750b9ad5ef 581 mbedtls_ctr_drbg_free( &ctx );
Christopher Haster 1:24750b9ad5ef 582
Christopher Haster 1:24750b9ad5ef 583 if( verbose != 0 )
Christopher Haster 1:24750b9ad5ef 584 mbedtls_printf( "passed\n" );
Christopher Haster 1:24750b9ad5ef 585
Christopher Haster 1:24750b9ad5ef 586 if( verbose != 0 )
Christopher Haster 1:24750b9ad5ef 587 mbedtls_printf( "\n" );
Christopher Haster 1:24750b9ad5ef 588
Christopher Haster 1:24750b9ad5ef 589 return( 0 );
Christopher Haster 1:24750b9ad5ef 590 }
Christopher Haster 1:24750b9ad5ef 591 #endif /* MBEDTLS_SELF_TEST */
Christopher Haster 1:24750b9ad5ef 592
Christopher Haster 1:24750b9ad5ef 593 #endif /* MBEDTLS_CTR_DRBG_C */