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Correct the aliasing requirements in doc for mbedtls_mpi_core_montmul(), and test them

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Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Tom Cosgrove
2022-09-29 14:40:21 +01:00
parent 119eae2e51
commit 4386ead662
3 changed files with 24 additions and 10 deletions
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17
tests/suites/test_suite_mpi.function
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@ -2140,11 +2140,22 @@ void mpi_core_montmul( int limbs_AN4, int limbs_B4,
memcpy( N.p, R.p, bytes );
/* The output may even be aliased to B, if AN_limbs == B_limbs */
if (limbs_AN == limbs_B)
{
/* Note: last test, so we don't save B */
/* Test when A aliased to B (requires A == B on input values) */
if ( memcmp( A.p, B.p, bytes ) == 0 )
{
/* Test with A aliased to B and output, since this is permitted -
* don't bother with yet another test with only A and B aliased */
mbedtls_mpi_core_montmul( B.p, B.p, B.p, B.n, N.p, N.n, mm, T.p );
ASSERT_COMPARE( B.p, bytes, X->p, bytes );
memcpy( B.p, A.p, bytes ); /* restore B from equal value A */
}
/* The output may be aliased to B - last test, so we don't save B */
mbedtls_mpi_core_montmul( B.p, A.p, B.p, B.n, N.p, N.n, mm, T.p );
ASSERT_COMPARE( B.p, bytes, X->p, bytes );
}