ECDSA with OpenSSL

1 files changed, 70 insertions, 0 deletions

diff --git a/src/libstrongswan/plugins/openssl/openssl_util.h b/src/libstrongswan/plugins/openssl/openssl_util.h
new file mode 100644
index 000000000..fda4eda5b
--- /dev/null
+++ b/src/libstrongswan/plugins/openssl/openssl_util.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program 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 General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+/**
+ * @defgroup openssl_util openssl_util
+ * @{ @ingroup openssl_p
+ */
+
+#ifndef OPENSSL_UTIL_H_
+#define OPENSSL_UTIL_H_
+
+#include <library.h>
+#include <openssl/bn.h>
+
+/**
+ * Returns the length in bytes of a field element
+ */
+#define EC_FIELD_ELEMENT_LEN(group) ((EC_GROUP_get_degree(group) + 7) / 8)
+
+/**
+ * Creates a hash of a given type of a chunk of data.
+ * 
+ * Note: this function allocates memory for the hash
+ * 
+ * @param hash_type	NID of the hash
+ * @param data		the chunk of data to hash
+ * @param hash		chunk that contains the hash
+ * @return 			TRUE on success, FALSE otherwise
+ */
+bool openssl_hash_chunk(int hash_type, chunk_t data, chunk_t *hash);
+
+/**
+ * Concatenates two bignums into a chunk, thereby enfocing the length of
+ * a single BIGNUM, if necessary, by pre-pending it with zeros.
+ * 
+ * Note: this function allocates memory for the chunk
+ * 
+ * @param len		the length of a single BIGNUM
+ * @param a			first BIGNUM
+ * @param b			second BIGNUM
+ * @param chunk		resulting chunk
+ * @return			TRUE on success, FALSE otherwise
+ */
+bool openssl_bn_cat(int len, BIGNUM *a, BIGNUM *b, chunk_t *chunk);
+
+/**
+ * Splits a chunk into two bignums of equal binary length.
+ * 
+ * @param chunk		a chunk that contains the two BIGNUMs
+ * @param a			first BIGNUM
+ * @param b			second BIGNUM
+ * @return			TRUE on success, FALSE otherwise
+ */
+bool openssl_bn_split(chunk_t chunk, BIGNUM *a, BIGNUM *b);
+
+#endif /*OPENSSL_UTIL_H_ @}*/