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diff --git a/src/libstrongswan/crypto/hashers/sha2_hasher.h b/src/libstrongswan/crypto/hashers/sha2_hasher.h
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+++ b/src/libstrongswan/crypto/hashers/sha2_hasher.h
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+/**
+ * @file sha2_hasher.h
+ * 
+ * @brief Interface of sha2_hasher_t
+ * 
+ */
+
+/*
+ * Copyright (C) 2006 Martin Willi
+ * 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 SHA2_HASHER_H_
+#define SHA2_HASHER_H_
+
+typedef struct sha2_hasher_t sha2_hasher_t;
+
+#include <crypto/hashers/hasher.h>
+
+/**
+ * @brief Implementation of hasher_t interface using the SHA2 algorithms.
+ *
+ * SHA2 is an other name for the SHA-256, SHA-384 and SHA-512 variants of
+ * the SHA hash algorithm.
+ *
+ * @b Constructors:
+ * - hasher_create() using HASH_SHA256, HASH_SHA384 or HASH_SHA512 as algorithm
+ * - sha2_hasher_create()
+ *
+ * @see hasher_t
+ * 
+ * @ingroup hashers
+ */
+struct sha2_hasher_t {
+	
+	/**
+	 * Generic hasher_t interface for this hasher.
+	 */
+	hasher_t hasher_interface;
+};
+
+/**
+ * @brief Creates a new sha2_hasher_t.
+ * 
+ * @param	algorithm	HASH_SHA256, HASH_SHA384 or HASH_SHA512
+ * @return				sha2_hasher_t object
+ * 
+ * @ingroup hashers
+ */
+sha2_hasher_t *sha2_hasher_create(hash_algorithm_t algorithm);
+
+#endif /* SHA2_HASHER_H_ */