1 files changed, 93 insertions, 0 deletions
diff --git a/src/libstrongswan/plugins/hmac/hmac.h b/src/libstrongswan/plugins/hmac/hmac.h
new file mode 100644
index 000000000..5f266e133
--- /dev/null
+++ b/src/libstrongswan/plugins/hmac/hmac.h
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2005-2008 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * 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.
+ */
+
+/**
+ * @defgroup hmac hmac
+ * @{ @ingroup hmac_p
+ */
+
+#ifndef HMAC_H_
+#define HMAC_H_
+
+typedef struct hmac_t hmac_t;
+
+#include <crypto/hashers/hasher.h>
+
+/**
+ * Message authentication using hash functions.
+ *
+ * This class implements the message authenticaion algorithm
+ * described in RFC2104. It uses a hash function, wich must
+ * be implemented as a hasher_t class.
+ */
+struct hmac_t {
+	/**
+	 * Generate message authentication code.
+	 * 
+	 * If buffer is NULL, no result is given back. A next call will
+	 * append the data to already supplied data. If buffer is not NULL, 
+	 * the mac of all apended data is calculated, returned and the
+	 * state of the hmac_t is reseted.
+	 * 
+	 * @param data		chunk of data to authenticate
+	 * @param buffer	pointer where the generated bytes will be written
+	 */
+	void (*get_mac) (hmac_t *this, chunk_t data, u_int8_t *buffer);
+	
+	/**
+	 * Generates message authentication code and allocate space for them.
+	 * 
+	 * If chunk is NULL, no result is given back. A next call will
+	 * append the data to already supplied. If chunk is not NULL, 
+	 * the mac of all apended data is calculated, returned and the
+	 * state of the hmac_t reset;
+	 * 
+	 * @param data		chunk of data to authenticate
+	 * @param chunk		chunk which will hold generated bytes
+	 */
+	void (*allocate_mac) (hmac_t *this, chunk_t data, chunk_t *chunk);
+	
+	/**
+	 * Get the block size of this hmac_t object.
+	 * 
+	 * @return			block size in bytes
+	 */
+	size_t (*get_block_size) (hmac_t *this);	
+	
+	/**
+	 * Set the key for this hmac_t object.
+	 * 
+	 * Any key length is accepted.
+	 * 
+	 * @param key		key to set
+	 */
+	void (*set_key) (hmac_t *this, chunk_t key);
+	
+	/**
+	 * Destroys a hmac_t object.
+	 */
+	void (*destroy) (hmac_t *this);
+};
+
+/**
+ * Creates a new hmac_t object.
+ * 
+ * @param hash_algorithm	hash algorithm to use
+ * @return					hmac_t object, NULL if not supported
+ */
+hmac_t *hmac_create(hash_algorithm_t hash_algorithm);
+
+#endif /*HMAC_H_ @}*/