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mpi_shrink test: just set the top bit

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No need to bypass the API to fill limbs. It's a better test to just
set the top bit that we want to have set, and it's one less bypass of
the API.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-06-15 21:19:18 +02:00
parent 3f1c3c9605
commit e109175d05
1 changed files with 7 additions and 4 deletions
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11
tests/suites/test_suite_mpi.function
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@ -630,11 +630,14 @@ void mbedtls_mpi_shrink( int before, int used, int min, int after )
mbedtls_mpi_init( &X ); mbedtls_mpi_init( &X );
TEST_ASSERT( mbedtls_mpi_grow( &X, before ) == 0 ); TEST_ASSERT( mbedtls_mpi_grow( &X, before ) == 0 );
TEST_ASSERT( used <= before ); if( used > 0 )
if( before > 0 ) {
memset( X.p, 0x2a, used * sizeof( mbedtls_mpi_uint ) ); size_t used_bit_count = used * 8 * sizeof( mbedtls_mpi_uint );
TEST_ASSERT( mbedtls_mpi_set_bit( &X, used_bit_count - 1, 1 ) == 0 );
}
TEST_EQUAL( X.n, (size_t) before );
TEST_ASSERT( mbedtls_mpi_shrink( &X, min ) == 0 ); TEST_ASSERT( mbedtls_mpi_shrink( &X, min ) == 0 );
TEST_ASSERT( X.n == (size_t) after ); TEST_EQUAL( X.n, (size_t) after );
exit: exit:
mbedtls_mpi_free( &X ); mbedtls_mpi_free( &X );