Move bignum_mod tests into separate files
Signed-off-by: Werner Lewis <werner.lewis@arm.com>
diff --git a/tests/suites/test_suite_bignum_mod.function b/tests/suites/test_suite_bignum_mod.function
new file mode 100644
index 0000000..1543623
--- /dev/null
+++ b/tests/suites/test_suite_bignum_mod.function
@@ -0,0 +1,100 @@
+/* BEGIN_HEADER */
+#include "mbedtls/bignum.h"
+#include "mbedtls/entropy.h"
+#include "bignum_mod.h"
+#include "constant_time_internal.h"
+#include "test/constant_flow.h"
+
+/* Check the validity of the sign bit in an MPI object. Reject representations
+ * that are not supported by the rest of the library and indicate a bug when
+ * constructing the value. */
+static int sign_is_valid( const mbedtls_mpi *X )
+{
+ if( X->s != 1 && X->s != -1 )
+ return( 0 ); // invalid sign bit, e.g. 0
+ if( mbedtls_mpi_bitlen( X ) == 0 && X->s != 1 )
+ return( 0 ); // negative zero
+ return( 1 );
+}
+
+/* END_HEADER */
+
+/* BEGIN_DEPENDENCIES
+ * depends_on:MBEDTLS_BIGNUM_C
+ * END_DEPENDENCIES
+ */
+
+/* BEGIN_CASE */
+void mpi_mod_setup( int ext_rep, int int_rep, int iret )
+{
+ #define MLIMBS 8
+ mbedtls_mpi_uint mp[MLIMBS];
+ mbedtls_mpi_mod_modulus m;
+ int ret;
+
+ memset( mp, 0xFF, sizeof(mp) );
+
+ mbedtls_mpi_mod_modulus_init( &m );
+ ret = mbedtls_mpi_mod_modulus_setup( &m, mp, MLIMBS, ext_rep, int_rep );
+ TEST_EQUAL( ret, iret );
+
+ /* Address sanitiser should catch if we try to free mp */
+ mbedtls_mpi_mod_modulus_free( &m );
+
+ /* Make sure that the modulus doesn't have reference to mp anymore */
+ TEST_ASSERT( m.p != mp );
+
+exit:
+ /* It should be safe to call an mbedtls free several times */
+ mbedtls_mpi_mod_modulus_free( &m );
+
+ #undef MLIMBS
+}
+/* END_CASE */
+
+
+/* BEGIN_CASE */
+void mpi_mod_mpi( char * input_X, char * input_Y,
+ char * input_A, int div_result )
+{
+ mbedtls_mpi X, Y, A;
+ int res;
+ mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &A );
+
+ TEST_ASSERT( mbedtls_test_read_mpi( &X, input_X ) == 0 );
+ TEST_ASSERT( mbedtls_test_read_mpi( &Y, input_Y ) == 0 );
+ TEST_ASSERT( mbedtls_test_read_mpi( &A, input_A ) == 0 );
+ res = mbedtls_mpi_mod_mpi( &X, &X, &Y );
+ TEST_ASSERT( res == div_result );
+ if( res == 0 )
+ {
+ TEST_ASSERT( sign_is_valid( &X ) );
+ TEST_ASSERT( mbedtls_mpi_cmp_mpi( &X, &A ) == 0 );
+ }
+
+exit:
+ mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &A );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void mpi_mod_int( char * input_X, int input_Y,
+ int input_A, int div_result )
+{
+ mbedtls_mpi X;
+ int res;
+ mbedtls_mpi_uint r;
+ mbedtls_mpi_init( &X );
+
+ TEST_ASSERT( mbedtls_test_read_mpi( &X, input_X ) == 0 );
+ res = mbedtls_mpi_mod_int( &r, &X, input_Y );
+ TEST_ASSERT( res == div_result );
+ if( res == 0 )
+ {
+ TEST_ASSERT( r == (mbedtls_mpi_uint) input_A );
+ }
+
+exit:
+ mbedtls_mpi_free( &X );
+}
+/* END_CASE */