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Add check for test input

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The input for fix_quasi_reduction must be in range 0 <= X < 2N.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
This commit is contained in:
Gabor Mezei 2023-01-24 12:48:15 +01:00
parent a24fd06451
commit ee2aff2093
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GPG Key ID: F072ACA227ACD71D
1 changed files with 9 additions and 0 deletions
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9
tests/suites/test_suite_bignum_mod_raw.function
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@ -348,6 +348,7 @@ void mpi_mod_raw_fix_quasi_reduction(char *input_N,
mbedtls_mpi_uint *A = NULL;
mbedtls_mpi_uint *N = NULL;
mbedtls_mpi_uint *res = NULL;
mbedtls_mpi_uint *tmp = NULL;
size_t limbs_A;
size_t limbs_N;
size_t limbs_res;
@ -365,6 +366,13 @@ void mpi_mod_raw_fix_quasi_reduction(char *input_N,
TEST_EQUAL(limbs_A, limbs);
TEST_EQUAL(limbs_res, limbs);
ASSERT_ALLOC(tmp, limbs);
memcpy(tmp, A, bytes);
/* Check that 0 <= X < 2N */
mbedtls_mpi_uint c = mbedtls_mpi_core_sub(tmp, A, N, limbs);
TEST_ASSERT(c || mbedtls_mpi_core_lt_ct(tmp, N, limbs));
TEST_EQUAL(mbedtls_mpi_mod_modulus_setup(
&m, N, limbs,
MBEDTLS_MPI_MOD_REP_MONTGOMERY), 0);
@ -375,6 +383,7 @@ void mpi_mod_raw_fix_quasi_reduction(char *input_N,
exit:
mbedtls_free(A);
mbedtls_free(res);
mbedtls_free(tmp);
mbedtls_mpi_mod_modulus_free(&m);
mbedtls_free(N);