Marco Zecchini / Mbed OS Example_RTOS

Rtos API example

mbed-os/features/mbedtls/src/ctr_drbg.c@0:9fca2b23d0ba, 2019-02-23 (annotated)

Committer:
marcozecchini
Date:
Sat Feb 23 12:13:36 2019 +0000
Revision:
0:9fca2b23d0ba
final commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
marcozecchini 0:9fca2b23d0ba 1 /*
marcozecchini 0:9fca2b23d0ba 2 * CTR_DRBG implementation based on AES-256 (NIST SP 800-90)
marcozecchini 0:9fca2b23d0ba 3 *
marcozecchini 0:9fca2b23d0ba 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
marcozecchini 0:9fca2b23d0ba 5 * SPDX-License-Identifier: Apache-2.0
marcozecchini 0:9fca2b23d0ba 6 *
marcozecchini 0:9fca2b23d0ba 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
marcozecchini 0:9fca2b23d0ba 8 * not use this file except in compliance with the License.
marcozecchini 0:9fca2b23d0ba 9 * You may obtain a copy of the License at
marcozecchini 0:9fca2b23d0ba 10 *
marcozecchini 0:9fca2b23d0ba 11 * http://www.apache.org/licenses/LICENSE-2.0
marcozecchini 0:9fca2b23d0ba 12 *
marcozecchini 0:9fca2b23d0ba 13 * Unless required by applicable law or agreed to in writing, software
marcozecchini 0:9fca2b23d0ba 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
marcozecchini 0:9fca2b23d0ba 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
marcozecchini 0:9fca2b23d0ba 16 * See the License for the specific language governing permissions and
marcozecchini 0:9fca2b23d0ba 17 * limitations under the License.
marcozecchini 0:9fca2b23d0ba 18 *
marcozecchini 0:9fca2b23d0ba 19 * This file is part of mbed TLS (https://tls.mbed.org)
marcozecchini 0:9fca2b23d0ba 20 */
marcozecchini 0:9fca2b23d0ba 21 /*
marcozecchini 0:9fca2b23d0ba 22 * The NIST SP 800-90 DRBGs are described in the following publucation.
marcozecchini 0:9fca2b23d0ba 23 *
marcozecchini 0:9fca2b23d0ba 24 * http://csrc.nist.gov/publications/nistpubs/800-90/SP800-90revised_March2007.pdf
marcozecchini 0:9fca2b23d0ba 25 */
marcozecchini 0:9fca2b23d0ba 26
marcozecchini 0:9fca2b23d0ba 27 #if !defined(MBEDTLS_CONFIG_FILE)
marcozecchini 0:9fca2b23d0ba 28 #include "mbedtls/config.h"
marcozecchini 0:9fca2b23d0ba 29 #else
marcozecchini 0:9fca2b23d0ba 30 #include MBEDTLS_CONFIG_FILE
marcozecchini 0:9fca2b23d0ba 31 #endif
marcozecchini 0:9fca2b23d0ba 32
marcozecchini 0:9fca2b23d0ba 33 #if defined(MBEDTLS_CTR_DRBG_C)
marcozecchini 0:9fca2b23d0ba 34
marcozecchini 0:9fca2b23d0ba 35 #include "mbedtls/ctr_drbg.h"
marcozecchini 0:9fca2b23d0ba 36
marcozecchini 0:9fca2b23d0ba 37 #include <string.h>
marcozecchini 0:9fca2b23d0ba 38
marcozecchini 0:9fca2b23d0ba 39 #if defined(MBEDTLS_FS_IO)
marcozecchini 0:9fca2b23d0ba 40 #include <stdio.h>
marcozecchini 0:9fca2b23d0ba 41 #endif
marcozecchini 0:9fca2b23d0ba 42
marcozecchini 0:9fca2b23d0ba 43 #if defined(MBEDTLS_SELF_TEST)
marcozecchini 0:9fca2b23d0ba 44 #if defined(MBEDTLS_PLATFORM_C)
marcozecchini 0:9fca2b23d0ba 45 #include "mbedtls/platform.h"
marcozecchini 0:9fca2b23d0ba 46 #else
marcozecchini 0:9fca2b23d0ba 47 #include <stdio.h>
marcozecchini 0:9fca2b23d0ba 48 #define mbedtls_printf printf
marcozecchini 0:9fca2b23d0ba 49 #endif /* MBEDTLS_PLATFORM_C */
marcozecchini 0:9fca2b23d0ba 50 #endif /* MBEDTLS_SELF_TEST */
marcozecchini 0:9fca2b23d0ba 51
marcozecchini 0:9fca2b23d0ba 52 /* Implementation that should never be optimized out by the compiler */
marcozecchini 0:9fca2b23d0ba 53 static void mbedtls_zeroize( void *v, size_t n ) {
marcozecchini 0:9fca2b23d0ba 54 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
marcozecchini 0:9fca2b23d0ba 55 }
marcozecchini 0:9fca2b23d0ba 56
marcozecchini 0:9fca2b23d0ba 57 /*
marcozecchini 0:9fca2b23d0ba 58 * CTR_DRBG context initialization
marcozecchini 0:9fca2b23d0ba 59 */
marcozecchini 0:9fca2b23d0ba 60 void mbedtls_ctr_drbg_init( mbedtls_ctr_drbg_context *ctx )
marcozecchini 0:9fca2b23d0ba 61 {
marcozecchini 0:9fca2b23d0ba 62 memset( ctx, 0, sizeof( mbedtls_ctr_drbg_context ) );
marcozecchini 0:9fca2b23d0ba 63
marcozecchini 0:9fca2b23d0ba 64 #if defined(MBEDTLS_THREADING_C)
marcozecchini 0:9fca2b23d0ba 65 mbedtls_mutex_init( &ctx->mutex );
marcozecchini 0:9fca2b23d0ba 66 #endif
marcozecchini 0:9fca2b23d0ba 67 }
marcozecchini 0:9fca2b23d0ba 68
marcozecchini 0:9fca2b23d0ba 69 /*
marcozecchini 0:9fca2b23d0ba 70 * Non-public function wrapped by mbedtls_ctr_drbg_seed(). Necessary to allow
marcozecchini 0:9fca2b23d0ba 71 * NIST tests to succeed (which require known length fixed entropy)
marcozecchini 0:9fca2b23d0ba 72 */
marcozecchini 0:9fca2b23d0ba 73 int mbedtls_ctr_drbg_seed_entropy_len(
marcozecchini 0:9fca2b23d0ba 74 mbedtls_ctr_drbg_context *ctx,
marcozecchini 0:9fca2b23d0ba 75 int (*f_entropy)(void *, unsigned char *, size_t),
marcozecchini 0:9fca2b23d0ba 76 void *p_entropy,
marcozecchini 0:9fca2b23d0ba 77 const unsigned char *custom,
marcozecchini 0:9fca2b23d0ba 78 size_t len,
marcozecchini 0:9fca2b23d0ba 79 size_t entropy_len )
marcozecchini 0:9fca2b23d0ba 80 {
marcozecchini 0:9fca2b23d0ba 81 int ret;
marcozecchini 0:9fca2b23d0ba 82 unsigned char key[MBEDTLS_CTR_DRBG_KEYSIZE];
marcozecchini 0:9fca2b23d0ba 83
marcozecchini 0:9fca2b23d0ba 84 memset( key, 0, MBEDTLS_CTR_DRBG_KEYSIZE );
marcozecchini 0:9fca2b23d0ba 85
marcozecchini 0:9fca2b23d0ba 86 mbedtls_aes_init( &ctx->aes_ctx );
marcozecchini 0:9fca2b23d0ba 87
marcozecchini 0:9fca2b23d0ba 88 ctx->f_entropy = f_entropy;
marcozecchini 0:9fca2b23d0ba 89 ctx->p_entropy = p_entropy;
marcozecchini 0:9fca2b23d0ba 90
marcozecchini 0:9fca2b23d0ba 91 ctx->entropy_len = entropy_len;
marcozecchini 0:9fca2b23d0ba 92 ctx->reseed_interval = MBEDTLS_CTR_DRBG_RESEED_INTERVAL;
marcozecchini 0:9fca2b23d0ba 93
marcozecchini 0:9fca2b23d0ba 94 /*
marcozecchini 0:9fca2b23d0ba 95 * Initialize with an empty key
marcozecchini 0:9fca2b23d0ba 96 */
marcozecchini 0:9fca2b23d0ba 97 mbedtls_aes_setkey_enc( &ctx->aes_ctx, key, MBEDTLS_CTR_DRBG_KEYBITS );
marcozecchini 0:9fca2b23d0ba 98
marcozecchini 0:9fca2b23d0ba 99 if( ( ret = mbedtls_ctr_drbg_reseed( ctx, custom, len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 100 return( ret );
marcozecchini 0:9fca2b23d0ba 101
marcozecchini 0:9fca2b23d0ba 102 return( 0 );
marcozecchini 0:9fca2b23d0ba 103 }
marcozecchini 0:9fca2b23d0ba 104
marcozecchini 0:9fca2b23d0ba 105 int mbedtls_ctr_drbg_seed( mbedtls_ctr_drbg_context *ctx,
marcozecchini 0:9fca2b23d0ba 106 int (*f_entropy)(void *, unsigned char *, size_t),
marcozecchini 0:9fca2b23d0ba 107 void *p_entropy,
marcozecchini 0:9fca2b23d0ba 108 const unsigned char *custom,
marcozecchini 0:9fca2b23d0ba 109 size_t len )
marcozecchini 0:9fca2b23d0ba 110 {
marcozecchini 0:9fca2b23d0ba 111 return( mbedtls_ctr_drbg_seed_entropy_len( ctx, f_entropy, p_entropy, custom, len,
marcozecchini 0:9fca2b23d0ba 112 MBEDTLS_CTR_DRBG_ENTROPY_LEN ) );
marcozecchini 0:9fca2b23d0ba 113 }
marcozecchini 0:9fca2b23d0ba 114
marcozecchini 0:9fca2b23d0ba 115 void mbedtls_ctr_drbg_free( mbedtls_ctr_drbg_context *ctx )
marcozecchini 0:9fca2b23d0ba 116 {
marcozecchini 0:9fca2b23d0ba 117 if( ctx == NULL )
marcozecchini 0:9fca2b23d0ba 118 return;
marcozecchini 0:9fca2b23d0ba 119
marcozecchini 0:9fca2b23d0ba 120 #if defined(MBEDTLS_THREADING_C)
marcozecchini 0:9fca2b23d0ba 121 mbedtls_mutex_free( &ctx->mutex );
marcozecchini 0:9fca2b23d0ba 122 #endif
marcozecchini 0:9fca2b23d0ba 123 mbedtls_aes_free( &ctx->aes_ctx );
marcozecchini 0:9fca2b23d0ba 124 mbedtls_zeroize( ctx, sizeof( mbedtls_ctr_drbg_context ) );
marcozecchini 0:9fca2b23d0ba 125 }
marcozecchini 0:9fca2b23d0ba 126
marcozecchini 0:9fca2b23d0ba 127 void mbedtls_ctr_drbg_set_prediction_resistance( mbedtls_ctr_drbg_context *ctx, int resistance )
marcozecchini 0:9fca2b23d0ba 128 {
marcozecchini 0:9fca2b23d0ba 129 ctx->prediction_resistance = resistance;
marcozecchini 0:9fca2b23d0ba 130 }
marcozecchini 0:9fca2b23d0ba 131
marcozecchini 0:9fca2b23d0ba 132 void mbedtls_ctr_drbg_set_entropy_len( mbedtls_ctr_drbg_context *ctx, size_t len )
marcozecchini 0:9fca2b23d0ba 133 {
marcozecchini 0:9fca2b23d0ba 134 ctx->entropy_len = len;
marcozecchini 0:9fca2b23d0ba 135 }
marcozecchini 0:9fca2b23d0ba 136
marcozecchini 0:9fca2b23d0ba 137 void mbedtls_ctr_drbg_set_reseed_interval( mbedtls_ctr_drbg_context *ctx, int interval )
marcozecchini 0:9fca2b23d0ba 138 {
marcozecchini 0:9fca2b23d0ba 139 ctx->reseed_interval = interval;
marcozecchini 0:9fca2b23d0ba 140 }
marcozecchini 0:9fca2b23d0ba 141
marcozecchini 0:9fca2b23d0ba 142 static int block_cipher_df( unsigned char *output,
marcozecchini 0:9fca2b23d0ba 143 const unsigned char *data, size_t data_len )
marcozecchini 0:9fca2b23d0ba 144 {
marcozecchini 0:9fca2b23d0ba 145 unsigned char buf[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16];
marcozecchini 0:9fca2b23d0ba 146 unsigned char tmp[MBEDTLS_CTR_DRBG_SEEDLEN];
marcozecchini 0:9fca2b23d0ba 147 unsigned char key[MBEDTLS_CTR_DRBG_KEYSIZE];
marcozecchini 0:9fca2b23d0ba 148 unsigned char chain[MBEDTLS_CTR_DRBG_BLOCKSIZE];
marcozecchini 0:9fca2b23d0ba 149 unsigned char *p, *iv;
marcozecchini 0:9fca2b23d0ba 150 mbedtls_aes_context aes_ctx;
marcozecchini 0:9fca2b23d0ba 151
marcozecchini 0:9fca2b23d0ba 152 int i, j;
marcozecchini 0:9fca2b23d0ba 153 size_t buf_len, use_len;
marcozecchini 0:9fca2b23d0ba 154
marcozecchini 0:9fca2b23d0ba 155 if( data_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
marcozecchini 0:9fca2b23d0ba 156 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
marcozecchini 0:9fca2b23d0ba 157
marcozecchini 0:9fca2b23d0ba 158 memset( buf, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16 );
marcozecchini 0:9fca2b23d0ba 159 mbedtls_aes_init( &aes_ctx );
marcozecchini 0:9fca2b23d0ba 160
marcozecchini 0:9fca2b23d0ba 161 /*
marcozecchini 0:9fca2b23d0ba 162 * Construct IV (16 bytes) and S in buffer
marcozecchini 0:9fca2b23d0ba 163 * IV = Counter (in 32-bits) padded to 16 with zeroes
marcozecchini 0:9fca2b23d0ba 164 * S = Length input string (in 32-bits) || Length of output (in 32-bits) ||
marcozecchini 0:9fca2b23d0ba 165 * data || 0x80
marcozecchini 0:9fca2b23d0ba 166 * (Total is padded to a multiple of 16-bytes with zeroes)
marcozecchini 0:9fca2b23d0ba 167 */
marcozecchini 0:9fca2b23d0ba 168 p = buf + MBEDTLS_CTR_DRBG_BLOCKSIZE;
marcozecchini 0:9fca2b23d0ba 169 *p++ = ( data_len >> 24 ) & 0xff;
marcozecchini 0:9fca2b23d0ba 170 *p++ = ( data_len >> 16 ) & 0xff;
marcozecchini 0:9fca2b23d0ba 171 *p++ = ( data_len >> 8 ) & 0xff;
marcozecchini 0:9fca2b23d0ba 172 *p++ = ( data_len ) & 0xff;
marcozecchini 0:9fca2b23d0ba 173 p += 3;
marcozecchini 0:9fca2b23d0ba 174 *p++ = MBEDTLS_CTR_DRBG_SEEDLEN;
marcozecchini 0:9fca2b23d0ba 175 memcpy( p, data, data_len );
marcozecchini 0:9fca2b23d0ba 176 p[data_len] = 0x80;
marcozecchini 0:9fca2b23d0ba 177
marcozecchini 0:9fca2b23d0ba 178 buf_len = MBEDTLS_CTR_DRBG_BLOCKSIZE + 8 + data_len + 1;
marcozecchini 0:9fca2b23d0ba 179
marcozecchini 0:9fca2b23d0ba 180 for( i = 0; i < MBEDTLS_CTR_DRBG_KEYSIZE; i++ )
marcozecchini 0:9fca2b23d0ba 181 key[i] = i;
marcozecchini 0:9fca2b23d0ba 182
marcozecchini 0:9fca2b23d0ba 183 mbedtls_aes_setkey_enc( &aes_ctx, key, MBEDTLS_CTR_DRBG_KEYBITS );
marcozecchini 0:9fca2b23d0ba 184
marcozecchini 0:9fca2b23d0ba 185 /*
marcozecchini 0:9fca2b23d0ba 186 * Reduce data to MBEDTLS_CTR_DRBG_SEEDLEN bytes of data
marcozecchini 0:9fca2b23d0ba 187 */
marcozecchini 0:9fca2b23d0ba 188 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
marcozecchini 0:9fca2b23d0ba 189 {
marcozecchini 0:9fca2b23d0ba 190 p = buf;
marcozecchini 0:9fca2b23d0ba 191 memset( chain, 0, MBEDTLS_CTR_DRBG_BLOCKSIZE );
marcozecchini 0:9fca2b23d0ba 192 use_len = buf_len;
marcozecchini 0:9fca2b23d0ba 193
marcozecchini 0:9fca2b23d0ba 194 while( use_len > 0 )
marcozecchini 0:9fca2b23d0ba 195 {
marcozecchini 0:9fca2b23d0ba 196 for( i = 0; i < MBEDTLS_CTR_DRBG_BLOCKSIZE; i++ )
marcozecchini 0:9fca2b23d0ba 197 chain[i] ^= p[i];
marcozecchini 0:9fca2b23d0ba 198 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
marcozecchini 0:9fca2b23d0ba 199 use_len -= ( use_len >= MBEDTLS_CTR_DRBG_BLOCKSIZE ) ?
marcozecchini 0:9fca2b23d0ba 200 MBEDTLS_CTR_DRBG_BLOCKSIZE : use_len;
marcozecchini 0:9fca2b23d0ba 201
marcozecchini 0:9fca2b23d0ba 202 mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, chain, chain );
marcozecchini 0:9fca2b23d0ba 203 }
marcozecchini 0:9fca2b23d0ba 204
marcozecchini 0:9fca2b23d0ba 205 memcpy( tmp + j, chain, MBEDTLS_CTR_DRBG_BLOCKSIZE );
marcozecchini 0:9fca2b23d0ba 206
marcozecchini 0:9fca2b23d0ba 207 /*
marcozecchini 0:9fca2b23d0ba 208 * Update IV
marcozecchini 0:9fca2b23d0ba 209 */
marcozecchini 0:9fca2b23d0ba 210 buf[3]++;
marcozecchini 0:9fca2b23d0ba 211 }
marcozecchini 0:9fca2b23d0ba 212
marcozecchini 0:9fca2b23d0ba 213 /*
marcozecchini 0:9fca2b23d0ba 214 * Do final encryption with reduced data
marcozecchini 0:9fca2b23d0ba 215 */
marcozecchini 0:9fca2b23d0ba 216 mbedtls_aes_setkey_enc( &aes_ctx, tmp, MBEDTLS_CTR_DRBG_KEYBITS );
marcozecchini 0:9fca2b23d0ba 217 iv = tmp + MBEDTLS_CTR_DRBG_KEYSIZE;
marcozecchini 0:9fca2b23d0ba 218 p = output;
marcozecchini 0:9fca2b23d0ba 219
marcozecchini 0:9fca2b23d0ba 220 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
marcozecchini 0:9fca2b23d0ba 221 {
marcozecchini 0:9fca2b23d0ba 222 mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, iv, iv );
marcozecchini 0:9fca2b23d0ba 223 memcpy( p, iv, MBEDTLS_CTR_DRBG_BLOCKSIZE );
marcozecchini 0:9fca2b23d0ba 224 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
marcozecchini 0:9fca2b23d0ba 225 }
marcozecchini 0:9fca2b23d0ba 226
marcozecchini 0:9fca2b23d0ba 227 mbedtls_aes_free( &aes_ctx );
marcozecchini 0:9fca2b23d0ba 228
marcozecchini 0:9fca2b23d0ba 229 return( 0 );
marcozecchini 0:9fca2b23d0ba 230 }
marcozecchini 0:9fca2b23d0ba 231
marcozecchini 0:9fca2b23d0ba 232 static int ctr_drbg_update_internal( mbedtls_ctr_drbg_context *ctx,
marcozecchini 0:9fca2b23d0ba 233 const unsigned char data[MBEDTLS_CTR_DRBG_SEEDLEN] )
marcozecchini 0:9fca2b23d0ba 234 {
marcozecchini 0:9fca2b23d0ba 235 unsigned char tmp[MBEDTLS_CTR_DRBG_SEEDLEN];
marcozecchini 0:9fca2b23d0ba 236 unsigned char *p = tmp;
marcozecchini 0:9fca2b23d0ba 237 int i, j;
marcozecchini 0:9fca2b23d0ba 238
marcozecchini 0:9fca2b23d0ba 239 memset( tmp, 0, MBEDTLS_CTR_DRBG_SEEDLEN );
marcozecchini 0:9fca2b23d0ba 240
marcozecchini 0:9fca2b23d0ba 241 for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE )
marcozecchini 0:9fca2b23d0ba 242 {
marcozecchini 0:9fca2b23d0ba 243 /*
marcozecchini 0:9fca2b23d0ba 244 * Increase counter
marcozecchini 0:9fca2b23d0ba 245 */
marcozecchini 0:9fca2b23d0ba 246 for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- )
marcozecchini 0:9fca2b23d0ba 247 if( ++ctx->counter[i - 1] != 0 )
marcozecchini 0:9fca2b23d0ba 248 break;
marcozecchini 0:9fca2b23d0ba 249
marcozecchini 0:9fca2b23d0ba 250 /*
marcozecchini 0:9fca2b23d0ba 251 * Crypt counter block
marcozecchini 0:9fca2b23d0ba 252 */
marcozecchini 0:9fca2b23d0ba 253 mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, ctx->counter, p );
marcozecchini 0:9fca2b23d0ba 254
marcozecchini 0:9fca2b23d0ba 255 p += MBEDTLS_CTR_DRBG_BLOCKSIZE;
marcozecchini 0:9fca2b23d0ba 256 }
marcozecchini 0:9fca2b23d0ba 257
marcozecchini 0:9fca2b23d0ba 258 for( i = 0; i < MBEDTLS_CTR_DRBG_SEEDLEN; i++ )
marcozecchini 0:9fca2b23d0ba 259 tmp[i] ^= data[i];
marcozecchini 0:9fca2b23d0ba 260
marcozecchini 0:9fca2b23d0ba 261 /*
marcozecchini 0:9fca2b23d0ba 262 * Update key and counter
marcozecchini 0:9fca2b23d0ba 263 */
marcozecchini 0:9fca2b23d0ba 264 mbedtls_aes_setkey_enc( &ctx->aes_ctx, tmp, MBEDTLS_CTR_DRBG_KEYBITS );
marcozecchini 0:9fca2b23d0ba 265 memcpy( ctx->counter, tmp + MBEDTLS_CTR_DRBG_KEYSIZE, MBEDTLS_CTR_DRBG_BLOCKSIZE );
marcozecchini 0:9fca2b23d0ba 266
marcozecchini 0:9fca2b23d0ba 267 return( 0 );
marcozecchini 0:9fca2b23d0ba 268 }
marcozecchini 0:9fca2b23d0ba 269
marcozecchini 0:9fca2b23d0ba 270 void mbedtls_ctr_drbg_update( mbedtls_ctr_drbg_context *ctx,
marcozecchini 0:9fca2b23d0ba 271 const unsigned char *additional, size_t add_len )
marcozecchini 0:9fca2b23d0ba 272 {
marcozecchini 0:9fca2b23d0ba 273 unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN];
marcozecchini 0:9fca2b23d0ba 274
marcozecchini 0:9fca2b23d0ba 275 if( add_len > 0 )
marcozecchini 0:9fca2b23d0ba 276 {
marcozecchini 0:9fca2b23d0ba 277 /* MAX_INPUT would be more logical here, but we have to match
marcozecchini 0:9fca2b23d0ba 278 * block_cipher_df()'s limits since we can't propagate errors */
marcozecchini 0:9fca2b23d0ba 279 if( add_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT )
marcozecchini 0:9fca2b23d0ba 280 add_len = MBEDTLS_CTR_DRBG_MAX_SEED_INPUT;
marcozecchini 0:9fca2b23d0ba 281
marcozecchini 0:9fca2b23d0ba 282 block_cipher_df( add_input, additional, add_len );
marcozecchini 0:9fca2b23d0ba 283 ctr_drbg_update_internal( ctx, add_input );
marcozecchini 0:9fca2b23d0ba 284 }
marcozecchini 0:9fca2b23d0ba 285 }
marcozecchini 0:9fca2b23d0ba 286
marcozecchini 0:9fca2b23d0ba 287 int mbedtls_ctr_drbg_reseed( mbedtls_ctr_drbg_context *ctx,
marcozecchini 0:9fca2b23d0ba 288 const unsigned char *additional, size_t len )
marcozecchini 0:9fca2b23d0ba 289 {
marcozecchini 0:9fca2b23d0ba 290 unsigned char seed[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT];
marcozecchini 0:9fca2b23d0ba 291 size_t seedlen = 0;
marcozecchini 0:9fca2b23d0ba 292
marcozecchini 0:9fca2b23d0ba 293 if( ctx->entropy_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT ||
marcozecchini 0:9fca2b23d0ba 294 len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT - ctx->entropy_len )
marcozecchini 0:9fca2b23d0ba 295 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
marcozecchini 0:9fca2b23d0ba 296
marcozecchini 0:9fca2b23d0ba 297 memset( seed, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT );
marcozecchini 0:9fca2b23d0ba 298
marcozecchini 0:9fca2b23d0ba 299 /*
marcozecchini 0:9fca2b23d0ba 300 * Gather entropy_len bytes of entropy to seed state
marcozecchini 0:9fca2b23d0ba 301 */
marcozecchini 0:9fca2b23d0ba 302 if( 0 != ctx->f_entropy( ctx->p_entropy, seed,
marcozecchini 0:9fca2b23d0ba 303 ctx->entropy_len ) )
marcozecchini 0:9fca2b23d0ba 304 {
marcozecchini 0:9fca2b23d0ba 305 return( MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED );
marcozecchini 0:9fca2b23d0ba 306 }
marcozecchini 0:9fca2b23d0ba 307
marcozecchini 0:9fca2b23d0ba 308 seedlen += ctx->entropy_len;
marcozecchini 0:9fca2b23d0ba 309
marcozecchini 0:9fca2b23d0ba 310 /*
marcozecchini 0:9fca2b23d0ba 311 * Add additional data
marcozecchini 0:9fca2b23d0ba 312 */
marcozecchini 0:9fca2b23d0ba 313 if( additional && len )
marcozecchini 0:9fca2b23d0ba 314 {
marcozecchini 0:9fca2b23d0ba 315 memcpy( seed + seedlen, additional, len );
marcozecchini 0:9fca2b23d0ba 316 seedlen += len;
marcozecchini 0:9fca2b23d0ba 317 }
marcozecchini 0:9fca2b23d0ba 318
marcozecchini 0:9fca2b23d0ba 319 /*
marcozecchini 0:9fca2b23d0ba 320 * Reduce to 384 bits
marcozecchini 0:9fca2b23d0ba 321 */
marcozecchini 0:9fca2b23d0ba 322 block_cipher_df( seed, seed, seedlen );
marcozecchini 0:9fca2b23d0ba 323
marcozecchini 0:9fca2b23d0ba 324 /*
marcozecchini 0:9fca2b23d0ba 325 * Update state
marcozecchini 0:9fca2b23d0ba 326 */
marcozecchini 0:9fca2b23d0ba 327 ctr_drbg_update_internal( ctx, seed );
marcozecchini 0:9fca2b23d0ba 328 ctx->reseed_counter = 1;
marcozecchini 0:9fca2b23d0ba 329
marcozecchini 0:9fca2b23d0ba 330 return( 0 );
marcozecchini 0:9fca2b23d0ba 331 }
marcozecchini 0:9fca2b23d0ba 332
marcozecchini 0:9fca2b23d0ba 333 int mbedtls_ctr_drbg_random_with_add( void *p_rng,
marcozecchini 0:9fca2b23d0ba 334 unsigned char *output, size_t output_len,
marcozecchini 0:9fca2b23d0ba 335 const unsigned char *additional, size_t add_len )
marcozecchini 0:9fca2b23d0ba 336 {
marcozecchini 0:9fca2b23d0ba 337 int ret = 0;
marcozecchini 0:9fca2b23d0ba 338 mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng;
marcozecchini 0:9fca2b23d0ba 339 unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN];
marcozecchini 0:9fca2b23d0ba 340 unsigned char *p = output;
marcozecchini 0:9fca2b23d0ba 341 unsigned char tmp[MBEDTLS_CTR_DRBG_BLOCKSIZE];
marcozecchini 0:9fca2b23d0ba 342 int i;
marcozecchini 0:9fca2b23d0ba 343 size_t use_len;
marcozecchini 0:9fca2b23d0ba 344
marcozecchini 0:9fca2b23d0ba 345 if( output_len > MBEDTLS_CTR_DRBG_MAX_REQUEST )
marcozecchini 0:9fca2b23d0ba 346 return( MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG );
marcozecchini 0:9fca2b23d0ba 347
marcozecchini 0:9fca2b23d0ba 348 if( add_len > MBEDTLS_CTR_DRBG_MAX_INPUT )
marcozecchini 0:9fca2b23d0ba 349 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
marcozecchini 0:9fca2b23d0ba 350
marcozecchini 0:9fca2b23d0ba 351 memset( add_input, 0, MBEDTLS_CTR_DRBG_SEEDLEN );
marcozecchini 0:9fca2b23d0ba 352
marcozecchini 0:9fca2b23d0ba 353 if( ctx->reseed_counter > ctx->reseed_interval ||
marcozecchini 0:9fca2b23d0ba 354 ctx->prediction_resistance )
marcozecchini 0:9fca2b23d0ba 355 {
marcozecchini 0:9fca2b23d0ba 356 if( ( ret = mbedtls_ctr_drbg_reseed( ctx, additional, add_len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 357 return( ret );
marcozecchini 0:9fca2b23d0ba 358
marcozecchini 0:9fca2b23d0ba 359 add_len = 0;
marcozecchini 0:9fca2b23d0ba 360 }
marcozecchini 0:9fca2b23d0ba 361
marcozecchini 0:9fca2b23d0ba 362 if( add_len > 0 )
marcozecchini 0:9fca2b23d0ba 363 {
marcozecchini 0:9fca2b23d0ba 364 block_cipher_df( add_input, additional, add_len );
marcozecchini 0:9fca2b23d0ba 365 ctr_drbg_update_internal( ctx, add_input );
marcozecchini 0:9fca2b23d0ba 366 }
marcozecchini 0:9fca2b23d0ba 367
marcozecchini 0:9fca2b23d0ba 368 while( output_len > 0 )
marcozecchini 0:9fca2b23d0ba 369 {
marcozecchini 0:9fca2b23d0ba 370 /*
marcozecchini 0:9fca2b23d0ba 371 * Increase counter
marcozecchini 0:9fca2b23d0ba 372 */
marcozecchini 0:9fca2b23d0ba 373 for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- )
marcozecchini 0:9fca2b23d0ba 374 if( ++ctx->counter[i - 1] != 0 )
marcozecchini 0:9fca2b23d0ba 375 break;
marcozecchini 0:9fca2b23d0ba 376
marcozecchini 0:9fca2b23d0ba 377 /*
marcozecchini 0:9fca2b23d0ba 378 * Crypt counter block
marcozecchini 0:9fca2b23d0ba 379 */
marcozecchini 0:9fca2b23d0ba 380 mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, ctx->counter, tmp );
marcozecchini 0:9fca2b23d0ba 381
marcozecchini 0:9fca2b23d0ba 382 use_len = ( output_len > MBEDTLS_CTR_DRBG_BLOCKSIZE ) ? MBEDTLS_CTR_DRBG_BLOCKSIZE :
marcozecchini 0:9fca2b23d0ba 383 output_len;
marcozecchini 0:9fca2b23d0ba 384 /*
marcozecchini 0:9fca2b23d0ba 385 * Copy random block to destination
marcozecchini 0:9fca2b23d0ba 386 */
marcozecchini 0:9fca2b23d0ba 387 memcpy( p, tmp, use_len );
marcozecchini 0:9fca2b23d0ba 388 p += use_len;
marcozecchini 0:9fca2b23d0ba 389 output_len -= use_len;
marcozecchini 0:9fca2b23d0ba 390 }
marcozecchini 0:9fca2b23d0ba 391
marcozecchini 0:9fca2b23d0ba 392 ctr_drbg_update_internal( ctx, add_input );
marcozecchini 0:9fca2b23d0ba 393
marcozecchini 0:9fca2b23d0ba 394 ctx->reseed_counter++;
marcozecchini 0:9fca2b23d0ba 395
marcozecchini 0:9fca2b23d0ba 396 return( 0 );
marcozecchini 0:9fca2b23d0ba 397 }
marcozecchini 0:9fca2b23d0ba 398
marcozecchini 0:9fca2b23d0ba 399 int mbedtls_ctr_drbg_random( void *p_rng, unsigned char *output, size_t output_len )
marcozecchini 0:9fca2b23d0ba 400 {
marcozecchini 0:9fca2b23d0ba 401 int ret;
marcozecchini 0:9fca2b23d0ba 402 mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng;
marcozecchini 0:9fca2b23d0ba 403
marcozecchini 0:9fca2b23d0ba 404 #if defined(MBEDTLS_THREADING_C)
marcozecchini 0:9fca2b23d0ba 405 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 406 return( ret );
marcozecchini 0:9fca2b23d0ba 407 #endif
marcozecchini 0:9fca2b23d0ba 408
marcozecchini 0:9fca2b23d0ba 409 ret = mbedtls_ctr_drbg_random_with_add( ctx, output, output_len, NULL, 0 );
marcozecchini 0:9fca2b23d0ba 410
marcozecchini 0:9fca2b23d0ba 411 #if defined(MBEDTLS_THREADING_C)
marcozecchini 0:9fca2b23d0ba 412 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
marcozecchini 0:9fca2b23d0ba 413 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
marcozecchini 0:9fca2b23d0ba 414 #endif
marcozecchini 0:9fca2b23d0ba 415
marcozecchini 0:9fca2b23d0ba 416 return( ret );
marcozecchini 0:9fca2b23d0ba 417 }
marcozecchini 0:9fca2b23d0ba 418
marcozecchini 0:9fca2b23d0ba 419 #if defined(MBEDTLS_FS_IO)
marcozecchini 0:9fca2b23d0ba 420 int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path )
marcozecchini 0:9fca2b23d0ba 421 {
marcozecchini 0:9fca2b23d0ba 422 int ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR;
marcozecchini 0:9fca2b23d0ba 423 FILE *f;
marcozecchini 0:9fca2b23d0ba 424 unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ];
marcozecchini 0:9fca2b23d0ba 425
marcozecchini 0:9fca2b23d0ba 426 if( ( f = fopen( path, "wb" ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 427 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
marcozecchini 0:9fca2b23d0ba 428
marcozecchini 0:9fca2b23d0ba 429 if( ( ret = mbedtls_ctr_drbg_random( ctx, buf, MBEDTLS_CTR_DRBG_MAX_INPUT ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 430 goto exit;
marcozecchini 0:9fca2b23d0ba 431
marcozecchini 0:9fca2b23d0ba 432 if( fwrite( buf, 1, MBEDTLS_CTR_DRBG_MAX_INPUT, f ) != MBEDTLS_CTR_DRBG_MAX_INPUT )
marcozecchini 0:9fca2b23d0ba 433 {
marcozecchini 0:9fca2b23d0ba 434 ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR;
marcozecchini 0:9fca2b23d0ba 435 goto exit;
marcozecchini 0:9fca2b23d0ba 436 }
marcozecchini 0:9fca2b23d0ba 437
marcozecchini 0:9fca2b23d0ba 438 ret = 0;
marcozecchini 0:9fca2b23d0ba 439
marcozecchini 0:9fca2b23d0ba 440 exit:
marcozecchini 0:9fca2b23d0ba 441 fclose( f );
marcozecchini 0:9fca2b23d0ba 442 return( ret );
marcozecchini 0:9fca2b23d0ba 443 }
marcozecchini 0:9fca2b23d0ba 444
marcozecchini 0:9fca2b23d0ba 445 int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path )
marcozecchini 0:9fca2b23d0ba 446 {
marcozecchini 0:9fca2b23d0ba 447 FILE *f;
marcozecchini 0:9fca2b23d0ba 448 size_t n;
marcozecchini 0:9fca2b23d0ba 449 unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ];
marcozecchini 0:9fca2b23d0ba 450
marcozecchini 0:9fca2b23d0ba 451 if( ( f = fopen( path, "rb" ) ) == NULL )
marcozecchini 0:9fca2b23d0ba 452 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
marcozecchini 0:9fca2b23d0ba 453
marcozecchini 0:9fca2b23d0ba 454 fseek( f, 0, SEEK_END );
marcozecchini 0:9fca2b23d0ba 455 n = (size_t) ftell( f );
marcozecchini 0:9fca2b23d0ba 456 fseek( f, 0, SEEK_SET );
marcozecchini 0:9fca2b23d0ba 457
marcozecchini 0:9fca2b23d0ba 458 if( n > MBEDTLS_CTR_DRBG_MAX_INPUT )
marcozecchini 0:9fca2b23d0ba 459 {
marcozecchini 0:9fca2b23d0ba 460 fclose( f );
marcozecchini 0:9fca2b23d0ba 461 return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG );
marcozecchini 0:9fca2b23d0ba 462 }
marcozecchini 0:9fca2b23d0ba 463
marcozecchini 0:9fca2b23d0ba 464 if( fread( buf, 1, n, f ) != n )
marcozecchini 0:9fca2b23d0ba 465 {
marcozecchini 0:9fca2b23d0ba 466 fclose( f );
marcozecchini 0:9fca2b23d0ba 467 return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR );
marcozecchini 0:9fca2b23d0ba 468 }
marcozecchini 0:9fca2b23d0ba 469
marcozecchini 0:9fca2b23d0ba 470 fclose( f );
marcozecchini 0:9fca2b23d0ba 471
marcozecchini 0:9fca2b23d0ba 472 mbedtls_ctr_drbg_update( ctx, buf, n );
marcozecchini 0:9fca2b23d0ba 473
marcozecchini 0:9fca2b23d0ba 474 return( mbedtls_ctr_drbg_write_seed_file( ctx, path ) );
marcozecchini 0:9fca2b23d0ba 475 }
marcozecchini 0:9fca2b23d0ba 476 #endif /* MBEDTLS_FS_IO */
marcozecchini 0:9fca2b23d0ba 477
marcozecchini 0:9fca2b23d0ba 478 #if defined(MBEDTLS_SELF_TEST)
marcozecchini 0:9fca2b23d0ba 479
marcozecchini 0:9fca2b23d0ba 480 static const unsigned char entropy_source_pr[96] =
marcozecchini 0:9fca2b23d0ba 481 { 0xc1, 0x80, 0x81, 0xa6, 0x5d, 0x44, 0x02, 0x16,
marcozecchini 0:9fca2b23d0ba 482 0x19, 0xb3, 0xf1, 0x80, 0xb1, 0xc9, 0x20, 0x02,
marcozecchini 0:9fca2b23d0ba 483 0x6a, 0x54, 0x6f, 0x0c, 0x70, 0x81, 0x49, 0x8b,
marcozecchini 0:9fca2b23d0ba 484 0x6e, 0xa6, 0x62, 0x52, 0x6d, 0x51, 0xb1, 0xcb,
marcozecchini 0:9fca2b23d0ba 485 0x58, 0x3b, 0xfa, 0xd5, 0x37, 0x5f, 0xfb, 0xc9,
marcozecchini 0:9fca2b23d0ba 486 0xff, 0x46, 0xd2, 0x19, 0xc7, 0x22, 0x3e, 0x95,
marcozecchini 0:9fca2b23d0ba 487 0x45, 0x9d, 0x82, 0xe1, 0xe7, 0x22, 0x9f, 0x63,
marcozecchini 0:9fca2b23d0ba 488 0x31, 0x69, 0xd2, 0x6b, 0x57, 0x47, 0x4f, 0xa3,
marcozecchini 0:9fca2b23d0ba 489 0x37, 0xc9, 0x98, 0x1c, 0x0b, 0xfb, 0x91, 0x31,
marcozecchini 0:9fca2b23d0ba 490 0x4d, 0x55, 0xb9, 0xe9, 0x1c, 0x5a, 0x5e, 0xe4,
marcozecchini 0:9fca2b23d0ba 491 0x93, 0x92, 0xcf, 0xc5, 0x23, 0x12, 0xd5, 0x56,
marcozecchini 0:9fca2b23d0ba 492 0x2c, 0x4a, 0x6e, 0xff, 0xdc, 0x10, 0xd0, 0x68 };
marcozecchini 0:9fca2b23d0ba 493
marcozecchini 0:9fca2b23d0ba 494 static const unsigned char entropy_source_nopr[64] =
marcozecchini 0:9fca2b23d0ba 495 { 0x5a, 0x19, 0x4d, 0x5e, 0x2b, 0x31, 0x58, 0x14,
marcozecchini 0:9fca2b23d0ba 496 0x54, 0xde, 0xf6, 0x75, 0xfb, 0x79, 0x58, 0xfe,
marcozecchini 0:9fca2b23d0ba 497 0xc7, 0xdb, 0x87, 0x3e, 0x56, 0x89, 0xfc, 0x9d,
marcozecchini 0:9fca2b23d0ba 498 0x03, 0x21, 0x7c, 0x68, 0xd8, 0x03, 0x38, 0x20,
marcozecchini 0:9fca2b23d0ba 499 0xf9, 0xe6, 0x5e, 0x04, 0xd8, 0x56, 0xf3, 0xa9,
marcozecchini 0:9fca2b23d0ba 500 0xc4, 0x4a, 0x4c, 0xbd, 0xc1, 0xd0, 0x08, 0x46,
marcozecchini 0:9fca2b23d0ba 501 0xf5, 0x98, 0x3d, 0x77, 0x1c, 0x1b, 0x13, 0x7e,
marcozecchini 0:9fca2b23d0ba 502 0x4e, 0x0f, 0x9d, 0x8e, 0xf4, 0x09, 0xf9, 0x2e };
marcozecchini 0:9fca2b23d0ba 503
marcozecchini 0:9fca2b23d0ba 504 static const unsigned char nonce_pers_pr[16] =
marcozecchini 0:9fca2b23d0ba 505 { 0xd2, 0x54, 0xfc, 0xff, 0x02, 0x1e, 0x69, 0xd2,
marcozecchini 0:9fca2b23d0ba 506 0x29, 0xc9, 0xcf, 0xad, 0x85, 0xfa, 0x48, 0x6c };
marcozecchini 0:9fca2b23d0ba 507
marcozecchini 0:9fca2b23d0ba 508 static const unsigned char nonce_pers_nopr[16] =
marcozecchini 0:9fca2b23d0ba 509 { 0x1b, 0x54, 0xb8, 0xff, 0x06, 0x42, 0xbf, 0xf5,
marcozecchini 0:9fca2b23d0ba 510 0x21, 0xf1, 0x5c, 0x1c, 0x0b, 0x66, 0x5f, 0x3f };
marcozecchini 0:9fca2b23d0ba 511
marcozecchini 0:9fca2b23d0ba 512 static const unsigned char result_pr[16] =
marcozecchini 0:9fca2b23d0ba 513 { 0x34, 0x01, 0x16, 0x56, 0xb4, 0x29, 0x00, 0x8f,
marcozecchini 0:9fca2b23d0ba 514 0x35, 0x63, 0xec, 0xb5, 0xf2, 0x59, 0x07, 0x23 };
marcozecchini 0:9fca2b23d0ba 515
marcozecchini 0:9fca2b23d0ba 516 static const unsigned char result_nopr[16] =
marcozecchini 0:9fca2b23d0ba 517 { 0xa0, 0x54, 0x30, 0x3d, 0x8a, 0x7e, 0xa9, 0x88,
marcozecchini 0:9fca2b23d0ba 518 0x9d, 0x90, 0x3e, 0x07, 0x7c, 0x6f, 0x21, 0x8f };
marcozecchini 0:9fca2b23d0ba 519
marcozecchini 0:9fca2b23d0ba 520 static size_t test_offset;
marcozecchini 0:9fca2b23d0ba 521 static int ctr_drbg_self_test_entropy( void *data, unsigned char *buf,
marcozecchini 0:9fca2b23d0ba 522 size_t len )
marcozecchini 0:9fca2b23d0ba 523 {
marcozecchini 0:9fca2b23d0ba 524 const unsigned char *p = data;
marcozecchini 0:9fca2b23d0ba 525 memcpy( buf, p + test_offset, len );
marcozecchini 0:9fca2b23d0ba 526 test_offset += len;
marcozecchini 0:9fca2b23d0ba 527 return( 0 );
marcozecchini 0:9fca2b23d0ba 528 }
marcozecchini 0:9fca2b23d0ba 529
marcozecchini 0:9fca2b23d0ba 530 #define CHK( c ) if( (c) != 0 ) \
marcozecchini 0:9fca2b23d0ba 531 { \
marcozecchini 0:9fca2b23d0ba 532 if( verbose != 0 ) \
marcozecchini 0:9fca2b23d0ba 533 mbedtls_printf( "failed\n" ); \
marcozecchini 0:9fca2b23d0ba 534 return( 1 ); \
marcozecchini 0:9fca2b23d0ba 535 }
marcozecchini 0:9fca2b23d0ba 536
marcozecchini 0:9fca2b23d0ba 537 /*
marcozecchini 0:9fca2b23d0ba 538 * Checkup routine
marcozecchini 0:9fca2b23d0ba 539 */
marcozecchini 0:9fca2b23d0ba 540 int mbedtls_ctr_drbg_self_test( int verbose )
marcozecchini 0:9fca2b23d0ba 541 {
marcozecchini 0:9fca2b23d0ba 542 mbedtls_ctr_drbg_context ctx;
marcozecchini 0:9fca2b23d0ba 543 unsigned char buf[16];
marcozecchini 0:9fca2b23d0ba 544
marcozecchini 0:9fca2b23d0ba 545 mbedtls_ctr_drbg_init( &ctx );
marcozecchini 0:9fca2b23d0ba 546
marcozecchini 0:9fca2b23d0ba 547 /*
marcozecchini 0:9fca2b23d0ba 548 * Based on a NIST CTR_DRBG test vector (PR = True)
marcozecchini 0:9fca2b23d0ba 549 */
marcozecchini 0:9fca2b23d0ba 550 if( verbose != 0 )
marcozecchini 0:9fca2b23d0ba 551 mbedtls_printf( " CTR_DRBG (PR = TRUE) : " );
marcozecchini 0:9fca2b23d0ba 552
marcozecchini 0:9fca2b23d0ba 553 test_offset = 0;
marcozecchini 0:9fca2b23d0ba 554 CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy,
marcozecchini 0:9fca2b23d0ba 555 (void *) entropy_source_pr, nonce_pers_pr, 16, 32 ) );
marcozecchini 0:9fca2b23d0ba 556 mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
marcozecchini 0:9fca2b23d0ba 557 CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
marcozecchini 0:9fca2b23d0ba 558 CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
marcozecchini 0:9fca2b23d0ba 559 CHK( memcmp( buf, result_pr, MBEDTLS_CTR_DRBG_BLOCKSIZE ) );
marcozecchini 0:9fca2b23d0ba 560
marcozecchini 0:9fca2b23d0ba 561 mbedtls_ctr_drbg_free( &ctx );
marcozecchini 0:9fca2b23d0ba 562
marcozecchini 0:9fca2b23d0ba 563 if( verbose != 0 )
marcozecchini 0:9fca2b23d0ba 564 mbedtls_printf( "passed\n" );
marcozecchini 0:9fca2b23d0ba 565
marcozecchini 0:9fca2b23d0ba 566 /*
marcozecchini 0:9fca2b23d0ba 567 * Based on a NIST CTR_DRBG test vector (PR = FALSE)
marcozecchini 0:9fca2b23d0ba 568 */
marcozecchini 0:9fca2b23d0ba 569 if( verbose != 0 )
marcozecchini 0:9fca2b23d0ba 570 mbedtls_printf( " CTR_DRBG (PR = FALSE): " );
marcozecchini 0:9fca2b23d0ba 571
marcozecchini 0:9fca2b23d0ba 572 mbedtls_ctr_drbg_init( &ctx );
marcozecchini 0:9fca2b23d0ba 573
marcozecchini 0:9fca2b23d0ba 574 test_offset = 0;
marcozecchini 0:9fca2b23d0ba 575 CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy,
marcozecchini 0:9fca2b23d0ba 576 (void *) entropy_source_nopr, nonce_pers_nopr, 16, 32 ) );
marcozecchini 0:9fca2b23d0ba 577 CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) );
marcozecchini 0:9fca2b23d0ba 578 CHK( mbedtls_ctr_drbg_reseed( &ctx, NULL, 0 ) );
marcozecchini 0:9fca2b23d0ba 579 CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) );
marcozecchini 0:9fca2b23d0ba 580 CHK( memcmp( buf, result_nopr, 16 ) );
marcozecchini 0:9fca2b23d0ba 581
marcozecchini 0:9fca2b23d0ba 582 mbedtls_ctr_drbg_free( &ctx );
marcozecchini 0:9fca2b23d0ba 583
marcozecchini 0:9fca2b23d0ba 584 if( verbose != 0 )
marcozecchini 0:9fca2b23d0ba 585 mbedtls_printf( "passed\n" );
marcozecchini 0:9fca2b23d0ba 586
marcozecchini 0:9fca2b23d0ba 587 if( verbose != 0 )
marcozecchini 0:9fca2b23d0ba 588 mbedtls_printf( "\n" );
marcozecchini 0:9fca2b23d0ba 589
marcozecchini 0:9fca2b23d0ba 590 return( 0 );
marcozecchini 0:9fca2b23d0ba 591 }
marcozecchini 0:9fca2b23d0ba 592 #endif /* MBEDTLS_SELF_TEST */
marcozecchini 0:9fca2b23d0ba 593
marcozecchini 0:9fca2b23d0ba 594 #endif /* MBEDTLS_CTR_DRBG_C */