From 9db10386430479067795bec66bb26343ff176ded Mon Sep 17 00:00:00 2001 From: Adam Harrison Date: Thu, 6 Jul 2023 06:37:41 -0400 Subject: Removed old mbedtls, replacing with submodule. --- lib/mbedtls-2.27.0/library/entropy.c | 737 ----------------------------------- 1 file changed, 737 deletions(-) delete mode 100644 lib/mbedtls-2.27.0/library/entropy.c (limited to 'lib/mbedtls-2.27.0/library/entropy.c') diff --git a/lib/mbedtls-2.27.0/library/entropy.c b/lib/mbedtls-2.27.0/library/entropy.c deleted file mode 100644 index 12fd3b9..0000000 --- a/lib/mbedtls-2.27.0/library/entropy.c +++ /dev/null @@ -1,737 +0,0 @@ -/* - * Entropy accumulator implementation - * - * Copyright The Mbed TLS Contributors - * 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. - */ - -#include "common.h" - -#if defined(MBEDTLS_ENTROPY_C) - -#if defined(MBEDTLS_TEST_NULL_ENTROPY) -#warning "**** WARNING! MBEDTLS_TEST_NULL_ENTROPY defined! " -#warning "**** THIS BUILD HAS NO DEFINED ENTROPY SOURCES " -#warning "**** THIS BUILD IS *NOT* SUITABLE FOR PRODUCTION USE " -#endif - -#include "mbedtls/entropy.h" -#include "mbedtls/entropy_poll.h" -#include "mbedtls/platform_util.h" -#include "mbedtls/error.h" - -#include - -#if defined(MBEDTLS_FS_IO) -#include -#endif - -#if defined(MBEDTLS_ENTROPY_NV_SEED) -#include "mbedtls/platform.h" -#endif - -#if defined(MBEDTLS_SELF_TEST) -#if defined(MBEDTLS_PLATFORM_C) -#include "mbedtls/platform.h" -#else -#include -#define mbedtls_printf printf -#endif /* MBEDTLS_PLATFORM_C */ -#endif /* MBEDTLS_SELF_TEST */ - -#if defined(MBEDTLS_HAVEGE_C) -#include "mbedtls/havege.h" -#endif - -#define ENTROPY_MAX_LOOP 256 /**< Maximum amount to loop before error */ - -void mbedtls_entropy_init( mbedtls_entropy_context *ctx ) -{ - ctx->source_count = 0; - memset( ctx->source, 0, sizeof( ctx->source ) ); - -#if defined(MBEDTLS_THREADING_C) - mbedtls_mutex_init( &ctx->mutex ); -#endif - - ctx->accumulator_started = 0; -#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) - mbedtls_sha512_init( &ctx->accumulator ); -#else - mbedtls_sha256_init( &ctx->accumulator ); -#endif -#if defined(MBEDTLS_HAVEGE_C) - mbedtls_havege_init( &ctx->havege_data ); -#endif - - /* Reminder: Update ENTROPY_HAVE_STRONG in the test files - * when adding more strong entropy sources here. */ - -#if defined(MBEDTLS_TEST_NULL_ENTROPY) - mbedtls_entropy_add_source( ctx, mbedtls_null_entropy_poll, NULL, - 1, MBEDTLS_ENTROPY_SOURCE_STRONG ); -#endif - -#if !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES) -#if !defined(MBEDTLS_NO_PLATFORM_ENTROPY) - mbedtls_entropy_add_source( ctx, mbedtls_platform_entropy_poll, NULL, - MBEDTLS_ENTROPY_MIN_PLATFORM, - MBEDTLS_ENTROPY_SOURCE_STRONG ); -#endif -#if defined(MBEDTLS_TIMING_C) - mbedtls_entropy_add_source( ctx, mbedtls_hardclock_poll, NULL, - MBEDTLS_ENTROPY_MIN_HARDCLOCK, - MBEDTLS_ENTROPY_SOURCE_WEAK ); -#endif -#if defined(MBEDTLS_HAVEGE_C) - mbedtls_entropy_add_source( ctx, mbedtls_havege_poll, &ctx->havege_data, - MBEDTLS_ENTROPY_MIN_HAVEGE, - MBEDTLS_ENTROPY_SOURCE_STRONG ); -#endif -#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT) - mbedtls_entropy_add_source( ctx, mbedtls_hardware_poll, NULL, - MBEDTLS_ENTROPY_MIN_HARDWARE, - MBEDTLS_ENTROPY_SOURCE_STRONG ); -#endif -#if defined(MBEDTLS_ENTROPY_NV_SEED) - mbedtls_entropy_add_source( ctx, mbedtls_nv_seed_poll, NULL, - MBEDTLS_ENTROPY_BLOCK_SIZE, - MBEDTLS_ENTROPY_SOURCE_STRONG ); - ctx->initial_entropy_run = 0; -#endif -#endif /* MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES */ -} - -void mbedtls_entropy_free( mbedtls_entropy_context *ctx ) -{ - /* If the context was already free, don't call free() again. - * This is important for mutexes which don't allow double-free. */ - if( ctx->accumulator_started == -1 ) - return; - -#if defined(MBEDTLS_HAVEGE_C) - mbedtls_havege_free( &ctx->havege_data ); -#endif -#if defined(MBEDTLS_THREADING_C) - mbedtls_mutex_free( &ctx->mutex ); -#endif -#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) - mbedtls_sha512_free( &ctx->accumulator ); -#else - mbedtls_sha256_free( &ctx->accumulator ); -#endif -#if defined(MBEDTLS_ENTROPY_NV_SEED) - ctx->initial_entropy_run = 0; -#endif - ctx->source_count = 0; - mbedtls_platform_zeroize( ctx->source, sizeof( ctx->source ) ); - ctx->accumulator_started = -1; -} - -int mbedtls_entropy_add_source( mbedtls_entropy_context *ctx, - mbedtls_entropy_f_source_ptr f_source, void *p_source, - size_t threshold, int strong ) -{ - int idx, ret = 0; - -#if defined(MBEDTLS_THREADING_C) - if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) - return( ret ); -#endif - - idx = ctx->source_count; - if( idx >= MBEDTLS_ENTROPY_MAX_SOURCES ) - { - ret = MBEDTLS_ERR_ENTROPY_MAX_SOURCES; - goto exit; - } - - ctx->source[idx].f_source = f_source; - ctx->source[idx].p_source = p_source; - ctx->source[idx].threshold = threshold; - ctx->source[idx].strong = strong; - - ctx->source_count++; - -exit: -#if defined(MBEDTLS_THREADING_C) - if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) - return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); -#endif - - return( ret ); -} - -/* - * Entropy accumulator update - */ -static int entropy_update( mbedtls_entropy_context *ctx, unsigned char source_id, - const unsigned char *data, size_t len ) -{ - unsigned char header[2]; - unsigned char tmp[MBEDTLS_ENTROPY_BLOCK_SIZE]; - size_t use_len = len; - const unsigned char *p = data; - int ret = 0; - - if( use_len > MBEDTLS_ENTROPY_BLOCK_SIZE ) - { -#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) - if( ( ret = mbedtls_sha512_ret( data, len, tmp, 0 ) ) != 0 ) - goto cleanup; -#else - if( ( ret = mbedtls_sha256_ret( data, len, tmp, 0 ) ) != 0 ) - goto cleanup; -#endif - p = tmp; - use_len = MBEDTLS_ENTROPY_BLOCK_SIZE; - } - - header[0] = source_id; - header[1] = use_len & 0xFF; - - /* - * Start the accumulator if this has not already happened. Note that - * it is sufficient to start the accumulator here only because all calls to - * gather entropy eventually execute this code. - */ -#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) - if( ctx->accumulator_started == 0 && - ( ret = mbedtls_sha512_starts_ret( &ctx->accumulator, 0 ) ) != 0 ) - goto cleanup; - else - ctx->accumulator_started = 1; - if( ( ret = mbedtls_sha512_update_ret( &ctx->accumulator, header, 2 ) ) != 0 ) - goto cleanup; - ret = mbedtls_sha512_update_ret( &ctx->accumulator, p, use_len ); -#else - if( ctx->accumulator_started == 0 && - ( ret = mbedtls_sha256_starts_ret( &ctx->accumulator, 0 ) ) != 0 ) - goto cleanup; - else - ctx->accumulator_started = 1; - if( ( ret = mbedtls_sha256_update_ret( &ctx->accumulator, header, 2 ) ) != 0 ) - goto cleanup; - ret = mbedtls_sha256_update_ret( &ctx->accumulator, p, use_len ); -#endif - -cleanup: - mbedtls_platform_zeroize( tmp, sizeof( tmp ) ); - - return( ret ); -} - -int mbedtls_entropy_update_manual( mbedtls_entropy_context *ctx, - const unsigned char *data, size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - -#if defined(MBEDTLS_THREADING_C) - if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) - return( ret ); -#endif - - ret = entropy_update( ctx, MBEDTLS_ENTROPY_SOURCE_MANUAL, data, len ); - -#if defined(MBEDTLS_THREADING_C) - if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) - return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); -#endif - - return( ret ); -} - -/* - * Run through the different sources to add entropy to our accumulator - */ -static int entropy_gather_internal( mbedtls_entropy_context *ctx ) -{ - int ret = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED; - int i; - int have_one_strong = 0; - unsigned char buf[MBEDTLS_ENTROPY_MAX_GATHER]; - size_t olen; - - if( ctx->source_count == 0 ) - return( MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED ); - - /* - * Run through our entropy sources - */ - for( i = 0; i < ctx->source_count; i++ ) - { - if( ctx->source[i].strong == MBEDTLS_ENTROPY_SOURCE_STRONG ) - have_one_strong = 1; - - olen = 0; - if( ( ret = ctx->source[i].f_source( ctx->source[i].p_source, - buf, MBEDTLS_ENTROPY_MAX_GATHER, &olen ) ) != 0 ) - { - goto cleanup; - } - - /* - * Add if we actually gathered something - */ - if( olen > 0 ) - { - if( ( ret = entropy_update( ctx, (unsigned char) i, - buf, olen ) ) != 0 ) - return( ret ); - ctx->source[i].size += olen; - } - } - - if( have_one_strong == 0 ) - ret = MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE; - -cleanup: - mbedtls_platform_zeroize( buf, sizeof( buf ) ); - - return( ret ); -} - -/* - * Thread-safe wrapper for entropy_gather_internal() - */ -int mbedtls_entropy_gather( mbedtls_entropy_context *ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - -#if defined(MBEDTLS_THREADING_C) - if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) - return( ret ); -#endif - - ret = entropy_gather_internal( ctx ); - -#if defined(MBEDTLS_THREADING_C) - if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) - return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); -#endif - - return( ret ); -} - -int mbedtls_entropy_func( void *data, unsigned char *output, size_t len ) -{ - int ret, count = 0, i, thresholds_reached; - size_t strong_size; - mbedtls_entropy_context *ctx = (mbedtls_entropy_context *) data; - unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE]; - - if( len > MBEDTLS_ENTROPY_BLOCK_SIZE ) - return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED ); - -#if defined(MBEDTLS_ENTROPY_NV_SEED) - /* Update the NV entropy seed before generating any entropy for outside - * use. - */ - if( ctx->initial_entropy_run == 0 ) - { - ctx->initial_entropy_run = 1; - if( ( ret = mbedtls_entropy_update_nv_seed( ctx ) ) != 0 ) - return( ret ); - } -#endif - -#if defined(MBEDTLS_THREADING_C) - if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) - return( ret ); -#endif - - /* - * Always gather extra entropy before a call - */ - do - { - if( count++ > ENTROPY_MAX_LOOP ) - { - ret = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED; - goto exit; - } - - if( ( ret = entropy_gather_internal( ctx ) ) != 0 ) - goto exit; - - thresholds_reached = 1; - strong_size = 0; - for( i = 0; i < ctx->source_count; i++ ) - { - if( ctx->source[i].size < ctx->source[i].threshold ) - thresholds_reached = 0; - if( ctx->source[i].strong == MBEDTLS_ENTROPY_SOURCE_STRONG ) - strong_size += ctx->source[i].size; - } - } - while( ! thresholds_reached || strong_size < MBEDTLS_ENTROPY_BLOCK_SIZE ); - - memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE ); - -#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) - /* - * Note that at this stage it is assumed that the accumulator was started - * in a previous call to entropy_update(). If this is not guaranteed, the - * code below will fail. - */ - if( ( ret = mbedtls_sha512_finish_ret( &ctx->accumulator, buf ) ) != 0 ) - goto exit; - - /* - * Reset accumulator and counters and recycle existing entropy - */ - mbedtls_sha512_free( &ctx->accumulator ); - mbedtls_sha512_init( &ctx->accumulator ); - if( ( ret = mbedtls_sha512_starts_ret( &ctx->accumulator, 0 ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_sha512_update_ret( &ctx->accumulator, buf, - MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 ) - goto exit; - - /* - * Perform second SHA-512 on entropy - */ - if( ( ret = mbedtls_sha512_ret( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, - buf, 0 ) ) != 0 ) - goto exit; -#else /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */ - if( ( ret = mbedtls_sha256_finish_ret( &ctx->accumulator, buf ) ) != 0 ) - goto exit; - - /* - * Reset accumulator and counters and recycle existing entropy - */ - mbedtls_sha256_free( &ctx->accumulator ); - mbedtls_sha256_init( &ctx->accumulator ); - if( ( ret = mbedtls_sha256_starts_ret( &ctx->accumulator, 0 ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_sha256_update_ret( &ctx->accumulator, buf, - MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 ) - goto exit; - - /* - * Perform second SHA-256 on entropy - */ - if( ( ret = mbedtls_sha256_ret( buf, MBEDTLS_ENTROPY_BLOCK_SIZE, - buf, 0 ) ) != 0 ) - goto exit; -#endif /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */ - - for( i = 0; i < ctx->source_count; i++ ) - ctx->source[i].size = 0; - - memcpy( output, buf, len ); - - ret = 0; - -exit: - mbedtls_platform_zeroize( buf, sizeof( buf ) ); - -#if defined(MBEDTLS_THREADING_C) - if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) - return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); -#endif - - return( ret ); -} - -#if defined(MBEDTLS_ENTROPY_NV_SEED) -int mbedtls_entropy_update_nv_seed( mbedtls_entropy_context *ctx ) -{ - int ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR; - unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE]; - - /* Read new seed and write it to NV */ - if( ( ret = mbedtls_entropy_func( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 ) - return( ret ); - - if( mbedtls_nv_seed_write( buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) < 0 ) - return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR ); - - /* Manually update the remaining stream with a separator value to diverge */ - memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE ); - ret = mbedtls_entropy_update_manual( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ); - - return( ret ); -} -#endif /* MBEDTLS_ENTROPY_NV_SEED */ - -#if defined(MBEDTLS_FS_IO) -int mbedtls_entropy_write_seed_file( mbedtls_entropy_context *ctx, const char *path ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - FILE *f = NULL; - unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE]; - - if( ( ret = mbedtls_entropy_func( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 ) - { - ret = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED; - goto exit; - } - - if( ( f = fopen( path, "wb" ) ) == NULL ) - { - ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR; - goto exit; - } - - if( fwrite( buf, 1, MBEDTLS_ENTROPY_BLOCK_SIZE, f ) != MBEDTLS_ENTROPY_BLOCK_SIZE ) - { - ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR; - goto exit; - } - - ret = 0; - -exit: - mbedtls_platform_zeroize( buf, sizeof( buf ) ); - - if( f != NULL ) - fclose( f ); - - return( ret ); -} - -int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *path ) -{ - int ret = 0; - FILE *f; - size_t n; - unsigned char buf[ MBEDTLS_ENTROPY_MAX_SEED_SIZE ]; - - if( ( f = fopen( path, "rb" ) ) == NULL ) - return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR ); - - fseek( f, 0, SEEK_END ); - n = (size_t) ftell( f ); - fseek( f, 0, SEEK_SET ); - - if( n > MBEDTLS_ENTROPY_MAX_SEED_SIZE ) - n = MBEDTLS_ENTROPY_MAX_SEED_SIZE; - - if( fread( buf, 1, n, f ) != n ) - ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR; - else - ret = mbedtls_entropy_update_manual( ctx, buf, n ); - - fclose( f ); - - mbedtls_platform_zeroize( buf, sizeof( buf ) ); - - if( ret != 0 ) - return( ret ); - - return( mbedtls_entropy_write_seed_file( ctx, path ) ); -} -#endif /* MBEDTLS_FS_IO */ - -#if defined(MBEDTLS_SELF_TEST) -#if !defined(MBEDTLS_TEST_NULL_ENTROPY) -/* - * Dummy source function - */ -static int entropy_dummy_source( void *data, unsigned char *output, - size_t len, size_t *olen ) -{ - ((void) data); - - memset( output, 0x2a, len ); - *olen = len; - - return( 0 ); -} -#endif /* !MBEDTLS_TEST_NULL_ENTROPY */ - -#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT) - -static int mbedtls_entropy_source_self_test_gather( unsigned char *buf, size_t buf_len ) -{ - int ret = 0; - size_t entropy_len = 0; - size_t olen = 0; - size_t attempts = buf_len; - - while( attempts > 0 && entropy_len < buf_len ) - { - if( ( ret = mbedtls_hardware_poll( NULL, buf + entropy_len, - buf_len - entropy_len, &olen ) ) != 0 ) - return( ret ); - - entropy_len += olen; - attempts--; - } - - if( entropy_len < buf_len ) - { - ret = 1; - } - - return( ret ); -} - - -static int mbedtls_entropy_source_self_test_check_bits( const unsigned char *buf, - size_t buf_len ) -{ - unsigned char set= 0xFF; - unsigned char unset = 0x00; - size_t i; - - for( i = 0; i < buf_len; i++ ) - { - set &= buf[i]; - unset |= buf[i]; - } - - return( set == 0xFF || unset == 0x00 ); -} - -/* - * A test to ensure hat the entropy sources are functioning correctly - * and there is no obvious failure. The test performs the following checks: - * - The entropy source is not providing only 0s (all bits unset) or 1s (all - * bits set). - * - The entropy source is not providing values in a pattern. Because the - * hardware could be providing data in an arbitrary length, this check polls - * the hardware entropy source twice and compares the result to ensure they - * are not equal. - * - The error code returned by the entropy source is not an error. - */ -int mbedtls_entropy_source_self_test( int verbose ) -{ - int ret = 0; - unsigned char buf0[2 * sizeof( unsigned long long int )]; - unsigned char buf1[2 * sizeof( unsigned long long int )]; - - if( verbose != 0 ) - mbedtls_printf( " ENTROPY_BIAS test: " ); - - memset( buf0, 0x00, sizeof( buf0 ) ); - memset( buf1, 0x00, sizeof( buf1 ) ); - - if( ( ret = mbedtls_entropy_source_self_test_gather( buf0, sizeof( buf0 ) ) ) != 0 ) - goto cleanup; - if( ( ret = mbedtls_entropy_source_self_test_gather( buf1, sizeof( buf1 ) ) ) != 0 ) - goto cleanup; - - /* Make sure that the returned values are not all 0 or 1 */ - if( ( ret = mbedtls_entropy_source_self_test_check_bits( buf0, sizeof( buf0 ) ) ) != 0 ) - goto cleanup; - if( ( ret = mbedtls_entropy_source_self_test_check_bits( buf1, sizeof( buf1 ) ) ) != 0 ) - goto cleanup; - - /* Make sure that the entropy source is not returning values in a - * pattern */ - ret = memcmp( buf0, buf1, sizeof( buf0 ) ) == 0; - -cleanup: - if( verbose != 0 ) - { - if( ret != 0 ) - mbedtls_printf( "failed\n" ); - else - mbedtls_printf( "passed\n" ); - - mbedtls_printf( "\n" ); - } - - return( ret != 0 ); -} - -#endif /* MBEDTLS_ENTROPY_HARDWARE_ALT */ - -/* - * The actual entropy quality is hard to test, but we can at least - * test that the functions don't cause errors and write the correct - * amount of data to buffers. - */ -int mbedtls_entropy_self_test( int verbose ) -{ - int ret = 1; -#if !defined(MBEDTLS_TEST_NULL_ENTROPY) - mbedtls_entropy_context ctx; - unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 }; - unsigned char acc[MBEDTLS_ENTROPY_BLOCK_SIZE] = { 0 }; - size_t i, j; -#endif /* !MBEDTLS_TEST_NULL_ENTROPY */ - - if( verbose != 0 ) - mbedtls_printf( " ENTROPY test: " ); - -#if !defined(MBEDTLS_TEST_NULL_ENTROPY) - mbedtls_entropy_init( &ctx ); - - /* First do a gather to make sure we have default sources */ - if( ( ret = mbedtls_entropy_gather( &ctx ) ) != 0 ) - goto cleanup; - - ret = mbedtls_entropy_add_source( &ctx, entropy_dummy_source, NULL, 16, - MBEDTLS_ENTROPY_SOURCE_WEAK ); - if( ret != 0 ) - goto cleanup; - - if( ( ret = mbedtls_entropy_update_manual( &ctx, buf, sizeof buf ) ) != 0 ) - goto cleanup; - - /* - * To test that mbedtls_entropy_func writes correct number of bytes: - * - use the whole buffer and rely on ASan to detect overruns - * - collect entropy 8 times and OR the result in an accumulator: - * any byte should then be 0 with probably 2^(-64), so requiring - * each of the 32 or 64 bytes to be non-zero has a false failure rate - * of at most 2^(-58) which is acceptable. - */ - for( i = 0; i < 8; i++ ) - { - if( ( ret = mbedtls_entropy_func( &ctx, buf, sizeof( buf ) ) ) != 0 ) - goto cleanup; - - for( j = 0; j < sizeof( buf ); j++ ) - acc[j] |= buf[j]; - } - - for( j = 0; j < sizeof( buf ); j++ ) - { - if( acc[j] == 0 ) - { - ret = 1; - goto cleanup; - } - } - -#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT) - if( ( ret = mbedtls_entropy_source_self_test( 0 ) ) != 0 ) - goto cleanup; -#endif - -cleanup: - mbedtls_entropy_free( &ctx ); -#endif /* !MBEDTLS_TEST_NULL_ENTROPY */ - - if( verbose != 0 ) - { - if( ret != 0 ) - mbedtls_printf( "failed\n" ); - else - mbedtls_printf( "passed\n" ); - - mbedtls_printf( "\n" ); - } - - return( ret != 0 ); -} -#endif /* MBEDTLS_SELF_TEST */ - -#endif /* MBEDTLS_ENTROPY_C */ -- cgit v1.2.3