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https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-26 09:15:43 +01:00
Added some descriptions of functions
Signed-off-by: Piotr Nowicki <piotr.nowicki@arm.com>
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@ -111,6 +111,9 @@ void *mbedtls_platform_memcpy( void *dst, const void *src, size_t num )
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/* Randomize initial data to prevent leakage while copying */
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/* Randomize initial data to prevent leakage while copying */
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uint32_t data = mbedtls_platform_random_in_range( 256 );
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uint32_t data = mbedtls_platform_random_in_range( 256 );
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/* Use memset with random value at first to increase security - memset is
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not normally part of the memcpy function and here can be useed
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with regular, unsecured implementation */
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memset( (void *) dst, data, num );
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memset( (void *) dst, data, num );
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memcpy( (void *) ( (unsigned char *) dst + start_offset ),
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memcpy( (void *) ( (unsigned char *) dst + start_offset ),
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(void *) ( (unsigned char *) src + start_offset ),
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(void *) ( (unsigned char *) src + start_offset ),
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@ -124,8 +127,8 @@ int mbedtls_platform_memcmp( const void *buf1, const void *buf2, size_t num )
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volatile const unsigned char *B = (volatile const unsigned char *) buf2;
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volatile const unsigned char *B = (volatile const unsigned char *) buf2;
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volatile unsigned char diff = 0;
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volatile unsigned char diff = 0;
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size_t i = num;
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/* Start from a random location and check the correct number of iterations */
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size_t flow_counter = 0;
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size_t i, flow_counter = 0;
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size_t start_offset = (size_t) mbedtls_platform_random_in_range( num );
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size_t start_offset = (size_t) mbedtls_platform_random_in_range( num );
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for( i = start_offset; i < num; i++ )
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for( i = start_offset; i < num; i++ )
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@ -290,6 +290,7 @@ uECC_word_t uECC_vli_equal(const uECC_word_t *left, const uECC_word_t *right)
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uECC_word_t tmp1, tmp2;
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uECC_word_t tmp1, tmp2;
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volatile int i;
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volatile int i;
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/* Start from a random location and check the correct number of iterations */
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int start_offset = mbedtls_platform_random_in_range(NUM_ECC_WORDS);
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int start_offset = mbedtls_platform_random_in_range(NUM_ECC_WORDS);
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for (i = start_offset; i < NUM_ECC_WORDS; ++i) {
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for (i = start_offset; i < NUM_ECC_WORDS; ++i) {
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@ -306,6 +307,7 @@ uECC_word_t uECC_vli_equal(const uECC_word_t *left, const uECC_word_t *right)
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diff |= (tmp1 ^ tmp2);
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diff |= (tmp1 ^ tmp2);
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}
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}
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/* Random delay to increase security */
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mbedtls_platform_random_delay();
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mbedtls_platform_random_delay();
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/* Return 0 only when diff is 0 and flow_counter is equal to NUM_ECC_WORDS */
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/* Return 0 only when diff is 0 and flow_counter is equal to NUM_ECC_WORDS */
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