mpi: Add an API for EC math.

* src/context.c, src/context.h: New.
* src/Makefile.am (libgcrypt_la_SOURCES): Add new files.
* src/gcrypt.h.in (struct gcry_context, gcry_ctx_t): New types.
(gcry_ctx_release): New prototype.
(gcry_mpi_ec_p_new, gcry_mpi_ec_get_affine, gcry_mpi_ec_dup)
(gcry_mpi_ec_add, gcry_mpi_ec_mul): New prototypes.
* mpi/ec.c: Include errno.h and context.h.
(_gcry_mpi_ec_init): Rename to ..
(ec_p_init): this, make static, remove allocation and add arg CTX.
(_gcry_mpi_ec_p_internal_new): New; to replace _gcry_mpi_ec_init.
Change all callers to use this func.
(_gcry_mpi_ec_free): Factor code out to ..
(ec_deinit): New func.
(gcry_mpi_ec_p_new): New.
* src/visibility.c: Include context.h and mpi.h.
(gcry_mpi_ec_p_new, gcry_mpi_ec_get_affine, gcry_mpi_ec_dup)
(gcry_mpi_ec_add, gcry_mpi_ec_mul)
(gcry_ctx_release): New wrapper functions.
* src/visibility.h: Mark new wrapper functions visible.
* src/libgcrypt.def, src/libgcrypt.vers: Add new symbols.
* tests/t-mpi-point.c (print_mpi, hex2mpi, cmp_mpihex): New.
(context_alloc): New.
(make_point, basic_ec_math): New.
--

This part finishes the basic API to do EC math.  It provides a wrapper
around all internal functions.  tests/t-mpi-point.c may be useful as
sample code.  Eventually we will add function to retrieve curve
parameters etc.

1 files changed, 31 insertions, 0 deletions

diff --git a/src/context.h b/src/context.h
new file mode 100644
index 00000000..72f14d48
--- /dev/null
+++ b/src/context.h
@@ -0,0 +1,31 @@
+/* context.h - Declarations for the context management
+ * Copyright (C) 2013  g10 Code GmbH
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser general Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GCRY_CONTEXT_H
+#define GCRY_CONTEXT_H
+
+/* Context types as used in struct gcry_context.  */
+#define CONTEXT_TYPE_EC 1  /* The context is used with EC functions.  */
+
+
+gcry_ctx_t _gcry_ctx_alloc (int type, size_t length, void (*deinit)(void*));
+void *_gcry_ctx_get_pointer (gcry_ctx_t ctx, int type);
+
+
+#endif /*GCRY_CONTEXT_H*/