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Test mpi_core_table_lookup for constant timeness

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Signed-off-by: Janos Follath <janos.follath@arm.com>
This commit is contained in:
Janos Follath 2022-10-28 10:54:46 +01:00
parent 032924f297
commit 133f4e427b
1 changed files with 11 additions and 0 deletions
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11
tests/suites/test_suite_bignum_core.function
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@ -966,12 +966,23 @@ void mpi_core_ct_uint_table_lookup( int bitlen, int window_size )
for( size_t i = 0; i < count; i++ )
{
/*
* We shouldn't leak anything through timing.
* We need to set these in every loop as we need to make the loop
* variable public for the loop head and comparison macros make the
* rest public automatically.
*/
TEST_CF_SECRET( &i, sizeof( i ) );
TEST_CF_SECRET( dest, limbs * sizeof( mbedtls_mpi_uint ) );
TEST_CF_SECRET( table, count * limbs * sizeof( mbedtls_mpi_uint ) );
memset( dest, 0x00, limbs * sizeof( *dest ) );
mbedtls_mpi_core_ct_uint_table_lookup( dest, table, limbs, count, i );
mbedtls_mpi_uint *current = table + i * limbs;
ASSERT_COMPARE( dest, limbs * sizeof( *dest ),
current, limbs * sizeof( *current ) );
TEST_CF_PUBLIC( &i, sizeof( i ) );
}
exit: