Add little endian export to Bignum
The function `mbedtls_mpi_write_binary()` writes big endian byte order,
but we need to be able to write little endian in some caseses. (For
example when handling keys corresponding to Montgomery curves.)
Used `echo xx | tac -rs ..` to transform the test data to little endian.
diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index 0ec45f6..5358379 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -378,6 +378,37 @@
}
/* END_CASE */
+/* BEGIN_CASE */
+void mbedtls_mpi_write_binary_le( int radix_X, char * input_X,
+ data_t * input_A, int output_size,
+ int result )
+{
+ mbedtls_mpi X;
+ unsigned char buf[1000];
+ size_t buflen;
+
+ memset( buf, 0x00, 1000 );
+
+ mbedtls_mpi_init( &X );
+
+ TEST_ASSERT( mbedtls_mpi_read_string( &X, radix_X, input_X ) == 0 );
+
+ buflen = mbedtls_mpi_size( &X );
+ if( buflen > (size_t) output_size )
+ buflen = (size_t) output_size;
+
+ TEST_ASSERT( mbedtls_mpi_write_binary_le( &X, buf, buflen ) == result );
+ if( result == 0)
+ {
+
+ TEST_ASSERT( hexcmp( buf, input_A->x, buflen, input_A->len ) == 0 );
+ }
+
+exit:
+ mbedtls_mpi_free( &X );
+}
+/* END_CASE */
+
/* BEGIN_CASE depends_on:MBEDTLS_FS_IO */
void mbedtls_mpi_read_file( int radix_X, char * input_file,
data_t * input_A, int result )