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Use mbedtls_mpi_sint not mbedtls_mpi_uint in mpi_mod_int test

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Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
This commit is contained in:
Tom Cosgrove 2022-11-10 12:05:55 +00:00
parent 91e35e3c32
commit 9feb19f98d
1 changed files with 13 additions and 3 deletions
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16
tests/suites/test_suite_bignum.function
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@ -981,11 +981,21 @@ void mpi_mod_int( char * input_X, char * input_Y,
TEST_EQUAL( Y.n, 1 );
TEST_EQUAL( A.n, 1 );
/* Convert the MPIs for Y and A to signed mbedtls_mpi_uints */
mbedtls_mpi_uint y = Y.p[0];
/* Convert the MPIs for Y and A to (signed) mbedtls_mpi_sints */
/* Since we're converting sign+magnitude to two's complement, we lose one
* bit of value in the output. This means there are some values we can't
* represent, e.g. (hex) -A0000000 on 32-bit systems. These are technically
* invalid test cases, so could be considered "won't happen", but they are
* easy to test for, and this helps guard against human error. */
mbedtls_mpi_sint y = (mbedtls_mpi_sint) Y.p[0];
TEST_ASSERT( y >= 0 ); /* If y < 0 here, we can't make negative y */
if( Y.s == -1 )
y = -y;
mbedtls_mpi_uint a = A.p[0];
mbedtls_mpi_sint a = (mbedtls_mpi_sint) A.p[0];
TEST_ASSERT( a >= 0 ); /* Same goes for a */
if( A.s == -1 )
a = -a;