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Random delay can be disabled in configuration

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Use random delay depending on whether MBEDTLS_FI_COUNTERMEASURES is defined

Signed-off-by: Piotr Nowicki <piotr.nowicki@arm.com>
This commit is contained in:
Piotr Nowicki 2020-08-03 13:08:33 +02:00
parent 77b7a7754c
commit 057daa3b28
2 changed files with 8 additions and 0 deletions
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4
include/mbedtls/platform_util.h
View file

@ -262,6 +262,10 @@ uint32_t mbedtls_platform_random_in_range( uint32_t num );
*
* Duration of the delay is random as number of variable increments
* is randomized.
*
* \note This function works only if the MBEDTLS_FI_COUNTERMEASURES flag
* is defined in the configuration. Otherwise, the function does
* nothing.
*/
void mbedtls_platform_random_delay( void );

4
library/platform_util.c
View file

@ -255,6 +255,7 @@ uint32_t mbedtls_platform_random_in_range( uint32_t num )
void mbedtls_platform_random_delay( void )
{
#if defined(MBEDTLS_FI_COUNTERMEASURES)
uint32_t rn_1, rn_2, rn_3;
volatile size_t i = 0;
uint8_t shift;
@ -276,6 +277,9 @@ void mbedtls_platform_random_delay( void )
rn_3 = ( rn_3 << shift ) | ( rn_3 >> ( 32 - shift ) );
rn_2 ^= rn_3;
} while( i < rn_1 || rn_2 == 0 || rn_3 == 0 );
#endif /* MBEDTLS_FI_COUNTERMEASURES */
return;
}
#if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT)