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+/*
+ Copyright (C) 2005, 2004, 2010 Erik Eliasson, Johan Bilien, Werner Dittmann
+
+ This library 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.
+
+ This library 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 library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you
+ * do not wish to do so, delete this exception statement from your
+ * version. If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+
+/**
+ * Functions to compute SHA1 HAMAC.
+ *
+ * @author Erik Eliasson <eliasson@it.kth.se>
+ * @author Johan Bilien <jobi@via.ecp.fr>
+ * @author Werner Dittmann
+ */
+
+#ifndef HMAC_H
+#define HMAC_H
+
+/**
+ * @file hmac.h
+ * @brief Functions that provide SHA1 HMAC support
+ *
+ * @ingroup GNU_ZRTP
+ * @{
+ */
+
+#include <stdint.h>
+
+#ifndef SHA1_DIGEST_LENGTH
+#define SHA1_DIGEST_LENGTH 20
+#endif
+
+/**
+ * Compute SHA1 HMAC.
+ *
+ * This functions takes one data chunk and computes its SHA1 HMAC.
+ *
+ * @param key
+ * The MAC key.
+ * @param key_length
+ * Lneght of the MAC key in bytes
+ * @param data
+ * Points to the data chunk.
+ * @param data_length
+ * Length of the data in bytes
+ * @param mac
+ * Points to a buffer that receives the computed digest. This
+ * buffer must have a size of at least 20 bytes (SHA1_DIGEST_LENGTH).
+ * @param mac_length
+ * Point to an integer that receives the length of the computed HMAC.
+ */
+
+void hmac_sha1( uint8_t* key, int32_t key_length,
+ const uint8_t* data, uint32_t data_length,
+ uint8_t* mac, int32_t* mac_length );
+
+/**
+ * Compute SHA1 HMAC over several data cunks.
+ *
+ * This functions takes several data chunk and computes the SHA1 HAMAC.
+ *
+ * @param key
+ * The MAC key.
+ * @param key_length
+ * Lneght of the MAC key in bytes
+ * @param data
+ * Points to an array of pointers that point to the data chunks. A NULL
+ * pointer in an array element terminates the data chunks.
+ * @param data_length
+ * Points to an array of integers that hold the length of each data chunk.
+ * @param mac
+ * Points to a buffer that receives the computed digest. This
+ * buffer must have a size of at least 20 bytes (SHA1_DIGEST_LENGTH).
+ * @param mac_length
+ * Point to an integer that receives the length of the computed HMAC.
+ */
+void hmac_sha1( uint8_t* key, int32_t key_length,
+ const uint8_t* data[], uint32_t data_length[],
+ uint8_t* mac, int32_t* mac_length );
+
+/**
+ * Create and initialize a SHA1 HMAC context.
+ *
+ * An application uses this context to create several HMAC with the same key.
+ *
+ * @param key
+ * The MAC key.
+ * @param key_length
+ * Lenght of the MAC key in bytes
+ * @return Returns a pointer to the initialized context
+ */
+void* createSha1HmacContext(uint8_t* key, int32_t key_length);
+
+/**
+ * Compute SHA1 HMAC.
+ *
+ * This functions takes one data chunk and computes its SHA1 HMAC. On return
+ * the SHA1 MAC context is ready to compute a HMAC for another data chunk.
+ *
+ * @param ctx
+ * Pointer to initialized SHA1 HMAC context
+ * @param data
+ * Points to the data chunk.
+ * @param data_length
+ * Length of the data in bytes
+ * @param mac
+ * Points to a buffer that receives the computed digest. This
+ * buffer must have a size of at least 20 bytes (SHA1_DIGEST_LENGTH).
+ * @param mac_length
+ * Point to an integer that receives the length of the computed HMAC.
+ */
+void hmacSha1Ctx(void* ctx, const uint8_t* data, uint32_t data_length,
+ uint8_t* mac, int32_t* mac_length );
+
+/**
+ * Compute SHA1 HMAC over several data cunks.
+ *
+ * This functions takes several data chunks and computes the SHA1 HAMAC. On return
+ * the SHA1 MAC context is ready to compute a HMAC for another data chunk.
+ *
+ * @param ctx
+ * Pointer to initialized SHA1 HMAC context
+ * @param data
+ * Points to an array of pointers that point to the data chunks. A NULL
+ * pointer in an array element terminates the data chunks.
+ * @param data_length
+ * Points to an array of integers that hold the length of each data chunk.
+ * @param mac
+ * Points to a buffer that receives the computed digest. This
+ * buffer must have a size of at least 20 bytes (SHA1_DIGEST_LENGTH).
+ * @param mac_length
+ * Point to an integer that receives the length of the computed HMAC.
+ */
+void hmacSha1Ctx(void* ctx, const uint8_t* data[], uint32_t data_length[],
+ uint8_t* mac, int32_t* mac_length );
+
+/**
+ * Free SHA1 HMAC context.
+ *
+ * @param ctx a pointer to SHA1 HMAC context
+ */
+void freeSha1HmacContext(void* ctx);
+
+
+/**
+ * @}
+ */
+#endif