Bignum: extract bignum_mod_raw.h functions
Extract functions declared in bignum_mod_raw.h into a source file with a
matching name.
We are doing this because:
- This is a general best practice/convention
- We hope that this will make resolving merge conflicts in the future
easier
- Having them in a unified source file is a premature optimisation at
this point
Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/library/bignum_mod_raw.c b/library/bignum_mod_raw.c
new file mode 100644
index 0000000..305cec1
--- /dev/null
+++ b/library/bignum_mod_raw.c
@@ -0,0 +1,90 @@
+/*
+ * Multi-precision integer library
+ *
+ * Copyright The Mbed TLS Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "common.h"
+
+#if defined(MBEDTLS_BIGNUM_C)
+
+#include <string.h>
+
+#include "mbedtls/error.h"
+#include "mbedtls/platform_util.h"
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_printf printf
+#define mbedtls_calloc calloc
+#define mbedtls_free free
+#endif
+
+#include "bignum_core.h"
+#include "bignum_mod_raw.h"
+#include "bignum_mod.h"
+#include "constant_time_internal.h"
+
+int mbedtls_mpi_mod_raw_read( mbedtls_mpi_uint *X,
+ mbedtls_mpi_mod_modulus *m,
+ unsigned char *buf,
+ size_t buflen )
+{
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+ if( m->ext_rep == MBEDTLS_MPI_MOD_EXT_REP_LE )
+ ret = mbedtls_mpi_core_read_le( X, m->n, buf, buflen );
+
+ else if( m->ext_rep == MBEDTLS_MPI_MOD_EXT_REP_BE )
+ ret = mbedtls_mpi_core_read_be( X, m->n, buf, buflen );
+ else
+ return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
+
+ if( ret != 0 )
+ goto cleanup;
+
+ if( !mbedtls_mpi_core_lt_ct( X, m->p, m->n ) )
+ {
+ ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
+ goto cleanup;
+ }
+
+cleanup:
+
+ return( ret );
+}
+
+int mbedtls_mpi_mod_raw_write( mbedtls_mpi_uint *X,
+ mbedtls_mpi_mod_modulus *m,
+ unsigned char *buf,
+ size_t buflen )
+{
+ if( m->ext_rep == MBEDTLS_MPI_MOD_EXT_REP_LE )
+ return mbedtls_mpi_core_write_le( X, m->n, buf, buflen );
+
+ else if( m->ext_rep == MBEDTLS_MPI_MOD_EXT_REP_BE )
+ return mbedtls_mpi_core_write_be( X, m->n, buf, buflen );
+
+ else
+ return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
+
+ return( 0 );
+}
+
+#endif /* MBEDTLS_BIGNUM_C */