Bignum: extract bignum_mod.h functions
Extract functions declared in bignum_mod.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
This makes library/bignum_new.c empty and therefore it is deleted.
Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/library/bignum_mod.c b/library/bignum_mod.c
new file mode 100644
index 0000000..63f9172
--- /dev/null
+++ b/library/bignum_mod.c
@@ -0,0 +1,153 @@
+/**
+ * Internal bignum functions
+ *
+ * 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/platform_util.h"
+#include "mbedtls/error.h"
+#include "mbedtls/bignum.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.h"
+#include "bignum_mod_raw.h"
+#include "constant_time_internal.h"
+
+int mbedtls_mpi_mod_residue_setup( mbedtls_mpi_mod_residue *r,
+ mbedtls_mpi_mod_modulus *m,
+ mbedtls_mpi_uint *p,
+ size_t pn )
+{
+ if( p == NULL || m == NULL || r == NULL )
+ return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
+
+ if( pn < m->n || !mbedtls_mpi_core_lt_ct( m->p, p, pn ) )
+ return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
+
+ r->n = m->n;
+ r->p = p;
+
+ return( 0 );
+}
+
+void mbedtls_mpi_mod_residue_release( mbedtls_mpi_mod_residue *r )
+{
+ if ( r == NULL )
+ return;
+
+ r->n = 0;
+ r->p = NULL;
+}
+
+void mbedtls_mpi_mod_modulus_init( mbedtls_mpi_mod_modulus *m )
+{
+ if ( m == NULL )
+ return;
+
+ m->p = NULL;
+ m->n = 0;
+ m->plen = 0;
+ m->ext_rep = MBEDTLS_MPI_MOD_EXT_REP_INVALID;
+ m->int_rep = MBEDTLS_MPI_MOD_REP_INVALID;
+}
+
+void mbedtls_mpi_mod_modulus_free( mbedtls_mpi_mod_modulus *m )
+{
+ if ( m == NULL )
+ return;
+
+ switch( m->int_rep )
+ {
+ case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
+ mbedtls_free( m->rep.mont ); break;
+ case MBEDTLS_MPI_MOD_REP_OPT_RED:
+ mbedtls_free( m->rep.ored ); break;
+ default:
+ break;
+ }
+
+ m->p = NULL;
+ m->n = 0;
+ m->plen = 0;
+ m->ext_rep = MBEDTLS_MPI_MOD_EXT_REP_INVALID;
+ m->int_rep = MBEDTLS_MPI_MOD_REP_INVALID;
+}
+
+int mbedtls_mpi_mod_modulus_setup( mbedtls_mpi_mod_modulus *m,
+ mbedtls_mpi_uint *p,
+ size_t pn,
+ int ext_rep,
+ int int_rep )
+{
+ int ret = 0;
+
+ if ( p == NULL || m == NULL )
+ return( MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
+
+ m->p = p;
+ m->n = pn;
+ m->plen = mbedtls_mpi_core_bitlen( p, pn );
+
+ switch( ext_rep )
+ {
+ case MBEDTLS_MPI_MOD_EXT_REP_LE:
+ case MBEDTLS_MPI_MOD_EXT_REP_BE:
+ m->ext_rep = ext_rep; break;
+ default:
+ ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
+ goto exit;
+ }
+
+ switch( int_rep )
+ {
+ case MBEDTLS_MPI_MOD_REP_MONTGOMERY:
+ m->int_rep = int_rep;
+ m->rep.mont = NULL; break;
+ case MBEDTLS_MPI_MOD_REP_OPT_RED:
+ m->int_rep = int_rep;
+ m->rep.ored = NULL; break;
+ default:
+ ret = MBEDTLS_ERR_MPI_BAD_INPUT_DATA;
+ goto exit;
+ }
+
+exit:
+
+ if( ret != 0 )
+ {
+ mbedtls_mpi_mod_modulus_free( m );
+ }
+
+ return( ret );
+}
+
+#endif /* MBEDTLS_BIGNUM_C */