| /* | |
| * CTR_DRBG implementation based on AES-256 (NIST SP 800-90) | |
| * | |
| * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved | |
| * SPDX-License-Identifier: Apache-2.0 | |
| * | |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may | |
| * not use this file except in compliance with the License. | |
| * You may obtain a copy of the License at | |
| * | |
| * http://www.apache.org/licenses/LICENSE-2.0 | |
| * | |
| * Unless required by applicable law or agreed to in writing, software | |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| * See the License for the specific language governing permissions and | |
| * limitations under the License. | |
| * | |
| * This file is part of mbed TLS (https://tls.mbed.org) | |
| */ | |
| /* | |
| * The NIST SP 800-90 DRBGs are described in the following publication. | |
| * | |
| * 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 "mbedtls/platform_util.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 */ | |
| /* | |
| * 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 mbedtls_ctr_drbg_seed(). Necessary to allow | |
| * NIST tests to succeed (which require known length fixed entropy) | |
| */ | |
| /* CTR_DRBG_Instantiate with derivation function (SP 800-90A §10.2.1.3.2) | |
| * mbedtls_ctr_drbg_seed_entropy_len(ctx, f_entropy, p_entropy, | |
| * custom, len, entropy_len) | |
| * implements | |
| * CTR_DRBG_Instantiate(entropy_input, nonce, personalization_string, | |
| * security_strength) -> initial_working_state | |
| * with inputs | |
| * custom[:len] = nonce || personalization_string | |
| * where entropy_input comes from f_entropy for entropy_len bytes | |
| * and with outputs | |
| * ctx = initial_working_state | |
| */ | |
| 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 | |
| */ | |
| if( ( ret = mbedtls_aes_setkey_enc( &ctx->aes_ctx, key, | |
| MBEDTLS_CTR_DRBG_KEYBITS ) ) != 0 ) | |
| { | |
| return( ret ); | |
| } | |
| 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_platform_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 ret = 0; | |
| 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; | |
| if( ( ret = mbedtls_aes_setkey_enc( &aes_ctx, key, | |
| MBEDTLS_CTR_DRBG_KEYBITS ) ) != 0 ) | |
| { | |
| goto exit; | |
| } | |
| /* | |
| * 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; | |
| if( ( ret = mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, | |
| chain, chain ) ) != 0 ) | |
| { | |
| goto exit; | |
| } | |
| } | |
| memcpy( tmp + j, chain, MBEDTLS_CTR_DRBG_BLOCKSIZE ); | |
| /* | |
| * Update IV | |
| */ | |
| buf[3]++; | |
| } | |
| /* | |
| * Do final encryption with reduced data | |
| */ | |
| if( ( ret = mbedtls_aes_setkey_enc( &aes_ctx, tmp, | |
| MBEDTLS_CTR_DRBG_KEYBITS ) ) != 0 ) | |
| { | |
| goto exit; | |
| } | |
| iv = tmp + MBEDTLS_CTR_DRBG_KEYSIZE; | |
| p = output; | |
| for( j = 0; j < MBEDTLS_CTR_DRBG_SEEDLEN; j += MBEDTLS_CTR_DRBG_BLOCKSIZE ) | |
| { | |
| if( ( ret = mbedtls_aes_crypt_ecb( &aes_ctx, MBEDTLS_AES_ENCRYPT, | |
| iv, iv ) ) != 0 ) | |
| { | |
| goto exit; | |
| } | |
| memcpy( p, iv, MBEDTLS_CTR_DRBG_BLOCKSIZE ); | |
| p += MBEDTLS_CTR_DRBG_BLOCKSIZE; | |
| } | |
| exit: | |
| mbedtls_aes_free( &aes_ctx ); | |
| /* | |
| * tidy up the stack | |
| */ | |
| mbedtls_platform_zeroize( buf, sizeof( buf ) ); | |
| mbedtls_platform_zeroize( tmp, sizeof( tmp ) ); | |
| mbedtls_platform_zeroize( key, sizeof( key ) ); | |
| mbedtls_platform_zeroize( chain, sizeof( chain ) ); | |
| if( 0 != ret ) | |
| { | |
| /* | |
| * wipe partial seed from memory | |
| */ | |
| mbedtls_platform_zeroize( output, MBEDTLS_CTR_DRBG_SEEDLEN ); | |
| } | |
| return( ret ); | |
| } | |
| /* CTR_DRBG_Update (SP 800-90A §10.2.1.2) | |
| * ctr_drbg_update_internal(ctx, provided_data) | |
| * implements | |
| * CTR_DRBG_Update(provided_data, Key, V) | |
| * with inputs and outputs | |
| * ctx->aes_ctx = Key | |
| * ctx->counter = V | |
| */ | |
| 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; | |
| int ret = 0; | |
| 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 | |
| */ | |
| if( ( ret = mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, | |
| ctx->counter, p ) ) != 0 ) | |
| { | |
| goto exit; | |
| } | |
| p += MBEDTLS_CTR_DRBG_BLOCKSIZE; | |
| } | |
| for( i = 0; i < MBEDTLS_CTR_DRBG_SEEDLEN; i++ ) | |
| tmp[i] ^= data[i]; | |
| /* | |
| * Update key and counter | |
| */ | |
| if( ( ret = mbedtls_aes_setkey_enc( &ctx->aes_ctx, tmp, | |
| MBEDTLS_CTR_DRBG_KEYBITS ) ) != 0 ) | |
| { | |
| goto exit; | |
| } | |
| memcpy( ctx->counter, tmp + MBEDTLS_CTR_DRBG_KEYSIZE, | |
| MBEDTLS_CTR_DRBG_BLOCKSIZE ); | |
| exit: | |
| mbedtls_platform_zeroize( tmp, sizeof( tmp ) ); | |
| return( ret ); | |
| } | |
| /* CTR_DRBG_Instantiate with derivation function (SP 800-90A §10.2.1.3.2) | |
| * mbedtls_ctr_drbg_update(ctx, additional, add_len) | |
| * implements | |
| * CTR_DRBG_Instantiate(entropy_input, nonce, personalization_string, | |
| * security_strength) -> initial_working_state | |
| * with inputs | |
| * ctx->counter = all-bits-0 | |
| * ctx->aes_ctx = context from all-bits-0 key | |
| * additional[:add_len] = entropy_input || nonce || personalization_string | |
| * and with outputs | |
| * ctx = initial_working_state | |
| */ | |
| int mbedtls_ctr_drbg_update_ret( mbedtls_ctr_drbg_context *ctx, | |
| const unsigned char *additional, | |
| size_t add_len ) | |
| { | |
| unsigned char add_input[MBEDTLS_CTR_DRBG_SEEDLEN]; | |
| int ret; | |
| if( add_len == 0 ) | |
| return( 0 ); | |
| if( ( ret = block_cipher_df( add_input, additional, add_len ) ) != 0 ) | |
| goto exit; | |
| if( ( ret = ctr_drbg_update_internal( ctx, add_input ) ) != 0 ) | |
| goto exit; | |
| exit: | |
| mbedtls_platform_zeroize( add_input, sizeof( add_input ) ); | |
| return( ret ); | |
| } | |
| #if !defined(MBEDTLS_DEPRECATED_REMOVED) | |
| void mbedtls_ctr_drbg_update( mbedtls_ctr_drbg_context *ctx, | |
| const unsigned char *additional, | |
| size_t add_len ) | |
| { | |
| /* 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; | |
| (void) mbedtls_ctr_drbg_update_ret( ctx, additional, add_len ); | |
| } | |
| #endif /* MBEDTLS_DEPRECATED_REMOVED */ | |
| /* CTR_DRBG_Reseed with derivation function (SP 800-90A §10.2.1.4.2) | |
| * mbedtls_ctr_drbg_reseed(ctx, additional, len) | |
| * implements | |
| * CTR_DRBG_Reseed(working_state, entropy_input, additional_input) | |
| * -> new_working_state | |
| * with inputs | |
| * ctx contains working_state | |
| * additional[:len] = additional_input | |
| * and entropy_input comes from calling ctx->f_entropy | |
| * and with output | |
| * ctx contains new_working_state | |
| */ | |
| 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; | |
| int ret; | |
| if( ctx->entropy_len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT || | |
| len > MBEDTLS_CTR_DRBG_MAX_SEED_INPUT - ctx->entropy_len ) | |
| 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 | |
| */ | |
| if( ( ret = block_cipher_df( seed, seed, seedlen ) ) != 0 ) | |
| goto exit; | |
| /* | |
| * Update state | |
| */ | |
| if( ( ret = ctr_drbg_update_internal( ctx, seed ) ) != 0 ) | |
| goto exit; | |
| ctx->reseed_counter = 1; | |
| exit: | |
| mbedtls_platform_zeroize( seed, sizeof( seed ) ); | |
| return( ret ); | |
| } | |
| /* CTR_DRBG_Generate with derivation function (SP 800-90A §10.2.1.5.2) | |
| * mbedtls_ctr_drbg_random_with_add(ctx, output, output_len, additional, add_len) | |
| * implements | |
| * CTR_DRBG_Reseed(working_state, entropy_input, additional[:add_len]) | |
| * -> working_state_after_reseed | |
| * if required, then | |
| * CTR_DRBG_Generate(working_state_after_reseed, | |
| * requested_number_of_bits, additional_input) | |
| * -> status, returned_bits, new_working_state | |
| * with inputs | |
| * ctx contains working_state | |
| * requested_number_of_bits = 8 * output_len | |
| * additional[:add_len] = additional_input | |
| * and entropy_input comes from calling ctx->f_entropy | |
| * and with outputs | |
| * status = SUCCESS (this function does the reseed internally) | |
| * returned_bits = output[:output_len] | |
| * ctx contains new_working_state | |
| */ | |
| 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 ) | |
| { | |
| if( ( ret = block_cipher_df( add_input, additional, add_len ) ) != 0 ) | |
| goto exit; | |
| if( ( ret = ctr_drbg_update_internal( ctx, add_input ) ) != 0 ) | |
| goto exit; | |
| } | |
| 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 | |
| */ | |
| if( ( ret = mbedtls_aes_crypt_ecb( &ctx->aes_ctx, MBEDTLS_AES_ENCRYPT, | |
| ctx->counter, tmp ) ) != 0 ) | |
| { | |
| goto exit; | |
| } | |
| 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; | |
| } | |
| if( ( ret = ctr_drbg_update_internal( ctx, add_input ) ) != 0 ) | |
| goto exit; | |
| ctx->reseed_counter++; | |
| exit: | |
| mbedtls_platform_zeroize( add_input, sizeof( add_input ) ); | |
| mbedtls_platform_zeroize( tmp, sizeof( tmp ) ); | |
| 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; | |
| } | |
| else | |
| { | |
| ret = 0; | |
| } | |
| exit: | |
| mbedtls_platform_zeroize( buf, sizeof( buf ) ); | |
| fclose( f ); | |
| return( ret ); | |
| } | |
| int mbedtls_ctr_drbg_update_seed_file( mbedtls_ctr_drbg_context *ctx, | |
| const char *path ) | |
| { | |
| int ret = 0; | |
| FILE *f = NULL; | |
| size_t n; | |
| unsigned char buf[ MBEDTLS_CTR_DRBG_MAX_INPUT ]; | |
| unsigned char c; | |
| if( ( f = fopen( path, "rb" ) ) == NULL ) | |
| return( MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR ); | |
| n = fread( buf, 1, sizeof( buf ), f ); | |
| if( fread( &c, 1, 1, f ) != 0 ) | |
| { | |
| ret = MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG; | |
| goto exit; | |
| } | |
| if( n == 0 || ferror( f ) ) | |
| { | |
| ret = MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR; | |
| goto exit; | |
| } | |
| fclose( f ); | |
| f = NULL; | |
| ret = mbedtls_ctr_drbg_update_ret( ctx, buf, n ); | |
| exit: | |
| mbedtls_platform_zeroize( buf, sizeof( buf ) ); | |
| if( f != NULL ) | |
| fclose( f ); | |
| if( ret != 0 ) | |
| return( ret ); | |
| 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 */ |