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diff --git a/src/libstrongswan/crypto/hashers/sha1_hasher.h b/src/libstrongswan/crypto/hashers/sha1_hasher.h
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+++ b/src/libstrongswan/crypto/hashers/sha1_hasher.h
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+/**
+ * @file sha1_hasher.h
+ * 
+ * @brief Interface of sha1_hasher_t
+ * 
+ */
+
+/*
+ * Copyright (C) 2005-2006 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.
+ */
+
+#ifndef SHA1_HASHER_H_
+#define SHA1_HASHER_H_
+
+typedef struct sha1_hasher_t sha1_hasher_t;
+
+#include <crypto/hashers/hasher.h>
+
+/**
+ * @brief Implementation of hasher_t interface using the
+ * SHA1 algorithm.
+ * 
+ * @b Constructors:
+ * - hasher_create() using HASH_SHA1 as algorithm
+ * - sha1_hasher_create()
+ * 
+ * @see hasher_t
+ * 
+ * @ingroup hashers
+ */
+struct sha1_hasher_t {
+	
+	/**
+	 * Generic hasher_t interface for this hasher.
+	 */
+	hasher_t hasher_interface;
+};
+
+/**
+ * @brief Creates a new sha1_hasher_t.
+ * 
+ * @return	sha1_hasher_t object
+ * 
+ * @ingroup hashers
+ */
+sha1_hasher_t *sha1_hasher_create(void);
+
+#endif /*SHA1_HASHER_H_*/