| /* |
| * CTR_DRBG implementation based on AES-256 (NIST SP 800-90) |
| * |
| * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved |
| * |
| * This file is part of mbed TLS (https://tls.mbed.org) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| /* |
| * The NIST SP 800-90 DRBGs are described in the following publucation. |
| * |
| * http://csrc.nist.gov/publications/nistpubs/800-90/SP800-90revised_March2007.pdf |
| */ |
| |
| #if !defined(MBEDTLS_CONFIG_FILE) |
| #include "mbedtls/config.h" |
| #else |
| #include MBEDTLS_CONFIG_FILE |
| #endif |
| |
| #if defined(MBEDTLS_CTR_DRBG_C) |
| |
| #include "mbedtls/ctr_drbg.h" |
| |
| #include <string.h> |
| |
| #if defined(MBEDTLS_FS_IO) |
| #include <stdio.h> |
| #endif |
| |
| #if defined(MBEDTLS_SELF_TEST) |
| #if defined(MBEDTLS_PLATFORM_C) |
| #include "mbedtls/platform.h" |
| #else |
| #include <stdio.h> |
| #define mbedtls_printf printf |
| #endif /* MBEDTLS_PLATFORM_C */ |
| #endif /* MBEDTLS_SELF_TEST */ |
| |
| /* Implementation that should never be optimized out by the compiler */ |
| static void mbedtls_zeroize( void *v, size_t n ) { |
| volatile unsigned char *p = v; while( n-- ) *p++ = 0; |
| } |
| |
| /* |
| * CTR_DRBG context initialization |
| */ |
| void mbedtls_ctr_drbg_init( mbedtls_ctr_drbg_context *ctx ) |
| { |
| memset( ctx, 0, sizeof( mbedtls_ctr_drbg_context ) ); |
| |
| #if defined(MBEDTLS_THREADING_C) |
| mbedtls_mutex_init( &ctx->mutex ); |
| #endif |
| } |
| |
| /* |
| * Non-public function wrapped by ctr_crbg_init(). Necessary to allow NIST |
| * tests to succeed (which require known length fixed entropy) |
| */ |
| int mbedtls_ctr_drbg_seed_entropy_len( |
| mbedtls_ctr_drbg_context *ctx, |
| int (*f_entropy)(void *, unsigned char *, size_t), |
| void *p_entropy, |
| const unsigned char *custom, |
| size_t len, |
| size_t entropy_len ) |
| { |
| int ret; |
| unsigned char key[MBEDTLS_CTR_DRBG_KEYSIZE]; |
| |
| memset( key, 0, MBEDTLS_CTR_DRBG_KEYSIZE ); |
| |
| mbedtls_aes_init( &ctx->aes_ctx ); |
| |
| ctx->f_entropy = f_entropy; |
| ctx->p_entropy = p_entropy; |
| |
| ctx->entropy_len = entropy_len; |
| ctx->reseed_interval = MBEDTLS_CTR_DRBG_RESEED_INTERVAL; |
| |
| /* |
| * Initialize with an empty key |
| */ |
| mbedtls_aes_setkey_enc( &ctx->aes_ctx, key, MBEDTLS_CTR_DRBG_KEYBITS ); |
| |
| if( ( ret = mbedtls_ctr_drbg_reseed( ctx, custom, len ) ) != 0 ) |
| return( ret ); |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ctr_drbg_seed( mbedtls_ctr_drbg_context *ctx, |
| int (*f_entropy)(void *, unsigned char *, size_t), |
| void *p_entropy, |
| const unsigned char *custom, |
| size_t len ) |
| { |
| return( mbedtls_ctr_drbg_seed_entropy_len( ctx, f_entropy, p_entropy, custom, len, |
| MBEDTLS_CTR_DRBG_ENTROPY_LEN ) ); |
| } |
| |
| void mbedtls_ctr_drbg_free( mbedtls_ctr_drbg_context *ctx ) |
| { |
| if( ctx == NULL ) |
| return; |
| |
| #if defined(MBEDTLS_THREADING_C) |
| mbedtls_mutex_free( &ctx->mutex ); |
| #endif |
| mbedtls_aes_free( &ctx->aes_ctx ); |
| mbedtls_zeroize( ctx, sizeof( mbedtls_ctr_drbg_context ) ); |
| } |
| |
| void mbedtls_ctr_drbg_set_prediction_resistance( mbedtls_ctr_drbg_context *ctx, int resistance ) |
| { |
| ctx->prediction_resistance = resistance; |
| } |
| |
| void mbedtls_ctr_drbg_set_entropy_len( mbedtls_ctr_drbg_context *ctx, size_t len ) |
| { |
| ctx->entropy_len = len; |
| } |
| |
| void mbedtls_ctr_drbg_set_reseed_interval( mbedtls_ctr_drbg_context *ctx, int interval ) |
| { |
| ctx->reseed_interval = interval; |
| } |
| |
| static int block_cipher_df( unsigned char *output, |
| const unsigned char *data, size_t data_len ) |
| { |
| unsigned char buf[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16]; |
| unsigned char tmp[MBEDTLS_CTR_DRBG_SEEDLEN]; |
| unsigned char key[MBEDTLS_CTR_DRBG_KEYSIZE]; |
| unsigned char chain[MBEDTLS_CTR_DRBG_BLOCKSIZE]; |
| unsigned char *p, *iv; |
| mbedtls_aes_context aes_ctx; |
| |
| int i, j; |
| size_t buf_len, use_len; |
| |
| if( data_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT ) |
| return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG ); |
| |
| memset( buf, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT + MBEDTLS_CTR_DRBG_BLOCKSIZE + 16 ); |
| mbedtls_aes_init( &aes_ctx ); |
| |
| /* |
| * Construct IV (16 bytes) and S in buffer |
| * IV = Counter (in 32-bits) padded to 16 with zeroes |
| * S = Length input string (in 32-bits) || Length of output (in 32-bits) || |
| * data || 0x80 |
| * (Total is padded to a multiple of 16-bytes with zeroes) |
| */ |
| p = buf + MBEDTLS_CTR_DRBG_BLOCKSIZE; |
| *p++ = ( data_len >> 24 ) & 0xff; |
| *p++ = ( data_len >> 16 ) & 0xff; |
| *p++ = ( data_len >> 8 ) & 0xff; |
| *p++ = ( data_len ) & 0xff; |
| p += 3; |
| *p++ = MBEDTLS_CTR_DRBG_SEEDLEN; |
| memcpy( p, data, data_len ); |
| p[data_len] = 0x80; |
| |
| buf_len = MBEDTLS_CTR_DRBG_BLOCKSIZE + 8 + data_len + 1; |
| |
| for( i = 0; i < MBEDTLS_CTR_DRBG_KEYSIZE; i++ ) |
| key[i] = i; |
| |
| mbedtls_aes_setkey_enc( &aes_ctx, key, MBEDTLS_CTR_DRBG_KEYBITS ); |
| |
| /* |
| * Reduce data to MBEDTLS_CTR_DRBG_SEEDLEN bytes of data |
| */ |
| for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE ) |
| { |
| p = buf; |
| memset( chain, 0, MBEDTLS_CTR_DRBG_BLOCKSIZE ); |
| use_len = buf_len; |
| |
| while( use_len > 0 ) |
| { |
| for( i = 0; i < MBEDTLS_CTR_DRBG_BLOCKSIZE; i++ ) |
| chain[i] ^= p[i]; |
| p += MBEDTLS_CTR_DRBG_BLOCKSIZE; |
| use_len -= ( use_len >= MBEDTLS_CTR_DRBG_BLOCKSIZE ) ? |
| MBEDTLS_CTR_DRBG_BLOCKSIZE : use_len; |
| |
| mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, chain, chain ); |
| } |
| |
| memcpy( tmp + j, chain, MBEDTLS_CTR_DRBG_BLOCKSIZE ); |
| |
| /* |
| * Update IV |
| */ |
| buf[3]++; |
| } |
| |
| /* |
| * Do final encryption with reduced data |
| */ |
| mbedtls_aes_setkey_enc( &aes_ctx, tmp, MBEDTLS_CTR_DRBG_KEYBITS ); |
| iv = tmp + MBEDTLS_CTR_DRBG_KEYSIZE; |
| p = output; |
| |
| for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE ) |
| { |
| mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, iv, iv ); |
| memcpy( p, iv, MBEDTLS_CTR_DRBG_BLOCKSIZE ); |
| p += MBEDTLS_CTR_DRBG_BLOCKSIZE; |
| } |
| |
| mbedtls_aes_free( &aes_ctx ); |
| |
| return( 0 ); |
| } |
| |
| static int ctr_drbg_update_internal( mbedtls_ctr_drbg_context *ctx, |
| const unsigned char data[MBEDTLS_CTR_DRBG_SEEDLEN] ) |
| { |
| unsigned char tmp[MBEDTLS_CTR_DRBG_SEEDLEN]; |
| unsigned char *p = tmp; |
| int i, j; |
| |
| memset( tmp, 0, MBEDTLS_CTR_DRBG_SEEDLEN ); |
| |
| for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE ) |
| { |
| /* |
| * Increase counter |
| */ |
| for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- ) |
| if( ++ctx->counter[i - 1] != 0 ) |
| break; |
| |
| /* |
| * Crypt counter block |
| */ |
| mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, ctx->counter, p ); |
| |
| p += MBEDTLS_CTR_DRBG_BLOCKSIZE; |
| } |
| |
| for( i = 0; i < MBEDTLS_CTR_DRBG_SEEDLEN; i++ ) |
| tmp[i] ^= data[i]; |
| |
| /* |
| * Update key and counter |
| */ |
| mbedtls_aes_setkey_enc( &ctx->aes_ctx, tmp, MBEDTLS_CTR_DRBG_KEYBITS ); |
| memcpy( ctx->counter, tmp + MBEDTLS_CTR_DRBG_KEYSIZE, MBEDTLS_CTR_DRBG_BLOCKSIZE ); |
| |
| return( 0 ); |
| } |
| |
| void mbedtls_ctr_drbg_update( mbedtls_ctr_drbg_context *ctx, |
| const unsigned char *additional, size_t add_len ) |
| { |
| unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN]; |
| |
| if( add_len > 0 ) |
| { |
| /* MAX_INPUT would be more logical here, but we have to match |
| * block_cipher_df()'s limits since we can't propagate errors */ |
| if( add_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT ) |
| add_len = MBEDTLS_CTR_DRBG_MAX_SEED_INPUT; |
| |
| block_cipher_df( add_input, additional, add_len ); |
| ctr_drbg_update_internal( ctx, add_input ); |
| } |
| } |
| |
| int mbedtls_ctr_drbg_reseed( mbedtls_ctr_drbg_context *ctx, |
| const unsigned char *additional, size_t len ) |
| { |
| unsigned char seed[MBEDTLS_CTR_DRBG_MAX_SEED_INPUT]; |
| size_t seedlen = 0; |
| |
| if( ctx->entropy_len + len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT ) |
| return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG ); |
| |
| memset( seed, 0, MBEDTLS_CTR_DRBG_MAX_SEED_INPUT ); |
| |
| /* |
| * Gather entropy_len bytes of entropy to seed state |
| */ |
| if( 0 != ctx->f_entropy( ctx->p_entropy, seed, |
| ctx->entropy_len ) ) |
| { |
| return( MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED ); |
| } |
| |
| seedlen += ctx->entropy_len; |
| |
| /* |
| * Add additional data |
| */ |
| if( additional && len ) |
| { |
| memcpy( seed + seedlen, additional, len ); |
| seedlen += len; |
| } |
| |
| /* |
| * Reduce to 384 bits |
| */ |
| block_cipher_df( seed, seed, seedlen ); |
| |
| /* |
| * Update state |
| */ |
| ctr_drbg_update_internal( ctx, seed ); |
| ctx->reseed_counter = 1; |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ctr_drbg_random_with_add( void *p_rng, |
| unsigned char *output, size_t output_len, |
| const unsigned char *additional, size_t add_len ) |
| { |
| int ret = 0; |
| mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng; |
| unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN]; |
| unsigned char *p = output; |
| unsigned char tmp[MBEDTLS_CTR_DRBG_BLOCKSIZE]; |
| int i; |
| size_t use_len; |
| |
| if( output_len > MBEDTLS_CTR_DRBG_MAX_REQUEST ) |
| return( MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG ); |
| |
| if( add_len > MBEDTLS_CTR_DRBG_MAX_INPUT ) |
| return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG ); |
| |
| memset( add_input, 0, MBEDTLS_CTR_DRBG_SEEDLEN ); |
| |
| if( ctx->reseed_counter > ctx->reseed_interval || |
| ctx->prediction_resistance ) |
| { |
| if( ( ret = mbedtls_ctr_drbg_reseed( ctx, additional, add_len ) ) != 0 ) |
| return( ret ); |
| |
| add_len = 0; |
| } |
| |
| if( add_len > 0 ) |
| { |
| block_cipher_df( add_input, additional, add_len ); |
| ctr_drbg_update_internal( ctx, add_input ); |
| } |
| |
| while( output_len > 0 ) |
| { |
| /* |
| * Increase counter |
| */ |
| for( i = MBEDTLS_CTR_DRBG_BLOCKSIZE; i > 0; i-- ) |
| if( ++ctx->counter[i - 1] != 0 ) |
| break; |
| |
| /* |
| * Crypt counter block |
| */ |
| mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, ctx->counter, tmp ); |
| |
| use_len = ( output_len > MBEDTLS_CTR_DRBG_BLOCKSIZE ) ? MBEDTLS_CTR_DRBG_BLOCKSIZE : |
| output_len; |
| /* |
| * Copy random block to destination |
| */ |
| memcpy( p, tmp, use_len ); |
| p += use_len; |
| output_len -= use_len; |
| } |
| |
| ctr_drbg_update_internal( ctx, add_input ); |
| |
| ctx->reseed_counter++; |
| |
| return( 0 ); |
| } |
| |
| int mbedtls_ctr_drbg_random( void *p_rng, unsigned char *output, size_t output_len ) |
| { |
| int ret; |
| mbedtls_ctr_drbg_context *ctx = (mbedtls_ctr_drbg_context *) p_rng; |
| |
| #if defined(MBEDTLS_THREADING_C) |
| if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) |
| return( ret ); |
| #endif |
| |
| ret = mbedtls_ctr_drbg_random_with_add( ctx, output, output_len, NULL, 0 ); |
| |
| #if defined(MBEDTLS_THREADING_C) |
| if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) |
| return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); |
| #endif |
| |
| return( ret ); |
| } |
| |
| #if defined(MBEDTLS_FS_IO) |
| int mbedtls_ctr_drbg_write_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path ) |
| { |
| int ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR; |
| FILE *f; |
| unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ]; |
| |
| if( ( f = fopen( path, "wb" ) ) == NULL ) |
| return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR ); |
| |
| if( ( ret = mbedtls_ctr_drbg_random( ctx, buf, MBEDTLS_CTR_DRBG_MAX_INPUT ) ) != 0 ) |
| goto exit; |
| |
| if( fwrite( buf, 1, MBEDTLS_CTR_DRBG_MAX_INPUT, f ) != MBEDTLS_CTR_DRBG_MAX_INPUT ) |
| { |
| ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR; |
| goto exit; |
| } |
| |
| ret = 0; |
| |
| exit: |
| fclose( f ); |
| return( ret ); |
| } |
| |
| int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, const char *path ) |
| { |
| FILE *f; |
| size_t n; |
| unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ]; |
| |
| if( ( f = fopen( path, "rb" ) ) == NULL ) |
| return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR ); |
| |
| fseek( f, 0, SEEK_END ); |
| n = (size_t) ftell( f ); |
| fseek( f, 0, SEEK_SET ); |
| |
| if( n > MBEDTLS_CTR_DRBG_MAX_INPUT ) |
| { |
| fclose( f ); |
| return( MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG ); |
| } |
| |
| if( fread( buf, 1, n, f ) != n ) |
| { |
| fclose( f ); |
| return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR ); |
| } |
| |
| fclose( f ); |
| |
| mbedtls_ctr_drbg_update( ctx, buf, n ); |
| |
| return( mbedtls_ctr_drbg_write_seed_file( ctx, path ) ); |
| } |
| #endif /* MBEDTLS_FS_IO */ |
| |
| #if defined(MBEDTLS_SELF_TEST) |
| |
| static const unsigned char entropy_source_pr[96] = |
| { 0xc1, 0x80, 0x81, 0xa6, 0x5d, 0x44, 0x02, 0x16, |
| 0x19, 0xb3, 0xf1, 0x80, 0xb1, 0xc9, 0x20, 0x02, |
| 0x6a, 0x54, 0x6f, 0x0c, 0x70, 0x81, 0x49, 0x8b, |
| 0x6e, 0xa6, 0x62, 0x52, 0x6d, 0x51, 0xb1, 0xcb, |
| 0x58, 0x3b, 0xfa, 0xd5, 0x37, 0x5f, 0xfb, 0xc9, |
| 0xff, 0x46, 0xd2, 0x19, 0xc7, 0x22, 0x3e, 0x95, |
| 0x45, 0x9d, 0x82, 0xe1, 0xe7, 0x22, 0x9f, 0x63, |
| 0x31, 0x69, 0xd2, 0x6b, 0x57, 0x47, 0x4f, 0xa3, |
| 0x37, 0xc9, 0x98, 0x1c, 0x0b, 0xfb, 0x91, 0x31, |
| 0x4d, 0x55, 0xb9, 0xe9, 0x1c, 0x5a, 0x5e, 0xe4, |
| 0x93, 0x92, 0xcf, 0xc5, 0x23, 0x12, 0xd5, 0x56, |
| 0x2c, 0x4a, 0x6e, 0xff, 0xdc, 0x10, 0xd0, 0x68 }; |
| |
| static const unsigned char entropy_source_nopr[64] = |
| { 0x5a, 0x19, 0x4d, 0x5e, 0x2b, 0x31, 0x58, 0x14, |
| 0x54, 0xde, 0xf6, 0x75, 0xfb, 0x79, 0x58, 0xfe, |
| 0xc7, 0xdb, 0x87, 0x3e, 0x56, 0x89, 0xfc, 0x9d, |
| 0x03, 0x21, 0x7c, 0x68, 0xd8, 0x03, 0x38, 0x20, |
| 0xf9, 0xe6, 0x5e, 0x04, 0xd8, 0x56, 0xf3, 0xa9, |
| 0xc4, 0x4a, 0x4c, 0xbd, 0xc1, 0xd0, 0x08, 0x46, |
| 0xf5, 0x98, 0x3d, 0x77, 0x1c, 0x1b, 0x13, 0x7e, |
| 0x4e, 0x0f, 0x9d, 0x8e, 0xf4, 0x09, 0xf9, 0x2e }; |
| |
| static const unsigned char nonce_pers_pr[16] = |
| { 0xd2, 0x54, 0xfc, 0xff, 0x02, 0x1e, 0x69, 0xd2, |
| 0x29, 0xc9, 0xcf, 0xad, 0x85, 0xfa, 0x48, 0x6c }; |
| |
| static const unsigned char nonce_pers_nopr[16] = |
| { 0x1b, 0x54, 0xb8, 0xff, 0x06, 0x42, 0xbf, 0xf5, |
| 0x21, 0xf1, 0x5c, 0x1c, 0x0b, 0x66, 0x5f, 0x3f }; |
| |
| static const unsigned char result_pr[16] = |
| { 0x34, 0x01, 0x16, 0x56, 0xb4, 0x29, 0x00, 0x8f, |
| 0x35, 0x63, 0xec, 0xb5, 0xf2, 0x59, 0x07, 0x23 }; |
| |
| static const unsigned char result_nopr[16] = |
| { 0xa0, 0x54, 0x30, 0x3d, 0x8a, 0x7e, 0xa9, 0x88, |
| 0x9d, 0x90, 0x3e, 0x07, 0x7c, 0x6f, 0x21, 0x8f }; |
| |
| static size_t test_offset; |
| static int ctr_drbg_self_test_entropy( void *data, unsigned char *buf, |
| size_t len ) |
| { |
| const unsigned char *p = data; |
| memcpy( buf, p + test_offset, len ); |
| test_offset += len; |
| return( 0 ); |
| } |
| |
| #define CHK( c ) if( (c) != 0 ) \ |
| { \ |
| if( verbose != 0 ) \ |
| mbedtls_printf( "failed\n" ); \ |
| return( 1 ); \ |
| } |
| |
| /* |
| * Checkup routine |
| */ |
| int mbedtls_ctr_drbg_self_test( int verbose ) |
| { |
| mbedtls_ctr_drbg_context ctx; |
| unsigned char buf[16]; |
| |
| mbedtls_ctr_drbg_init( &ctx ); |
| |
| /* |
| * Based on a NIST CTR_DRBG test vector (PR = True) |
| */ |
| if( verbose != 0 ) |
| mbedtls_printf( " CTR_DRBG (PR = TRUE) : " ); |
| |
| test_offset = 0; |
| CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy, |
| (void *) entropy_source_pr, nonce_pers_pr, 16, 32 ) ); |
| mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON ); |
| CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) ); |
| CHK( mbedtls_ctr_drbg_random( &ctx, buf, MBEDTLS_CTR_DRBG_BLOCKSIZE ) ); |
| CHK( memcmp( buf, result_pr, MBEDTLS_CTR_DRBG_BLOCKSIZE ) ); |
| |
| mbedtls_ctr_drbg_free( &ctx ); |
| |
| if( verbose != 0 ) |
| mbedtls_printf( "passed\n" ); |
| |
| /* |
| * Based on a NIST CTR_DRBG test vector (PR = FALSE) |
| */ |
| if( verbose != 0 ) |
| mbedtls_printf( " CTR_DRBG (PR = FALSE): " ); |
| |
| mbedtls_ctr_drbg_init( &ctx ); |
| |
| test_offset = 0; |
| CHK( mbedtls_ctr_drbg_seed_entropy_len( &ctx, ctr_drbg_self_test_entropy, |
| (void *) entropy_source_nopr, nonce_pers_nopr, 16, 32 ) ); |
| CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) ); |
| CHK( mbedtls_ctr_drbg_reseed( &ctx, NULL, 0 ) ); |
| CHK( mbedtls_ctr_drbg_random( &ctx, buf, 16 ) ); |
| CHK( memcmp( buf, result_nopr, 16 ) ); |
| |
| mbedtls_ctr_drbg_free( &ctx ); |
| |
| if( verbose != 0 ) |
| mbedtls_printf( "passed\n" ); |
| |
| if( verbose != 0 ) |
| mbedtls_printf( "\n" ); |
| |
| return( 0 ); |
| } |
| #endif /* MBEDTLS_SELF_TEST */ |
| |
| #endif /* MBEDTLS_CTR_DRBG_C */ |
