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diff --git a/src/libstrongswan/crypto/pkcs5.h b/src/libstrongswan/crypto/pkcs5.h
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+++ b/src/libstrongswan/crypto/pkcs5.h
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+/*
+ * Copyright (C) 2013 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.
+ */
+
+/**
+ * @defgroup pkcs5 pkcs5
+ * @{ @ingroup crypto
+ */
+
+#ifndef PKCS5_H_
+#define PKCS5_H_
+
+typedef struct pkcs5_t pkcs5_t;
+
+#include <utils/chunk.h>
+
+/**
+ * PKCS#5 helper class
+ */
+struct pkcs5_t {
+
+	/**
+	 * Decrypt the given data using the given password and the scheme derived
+	 * from the initial AlgorithmIdentifier object.
+	 *
+	 * @param password	password used for decryption
+	 * @param data		data to decrypt
+	 * @param decrypted	decrypted data gets allocated
+	 * @return			TRUE on success, FALSE otherwise
+	 */
+	bool (*decrypt)(pkcs5_t *this, chunk_t password, chunk_t data,
+					chunk_t *decrypted) __attribute__((warn_unused_result));
+
+	/**
+	 * Destroy the object and any associated cryptographic primitive.
+	 */
+	void (*destroy)(pkcs5_t *this);
+};
+
+/**
+ * Create a PKCS#5 helper object from an ASN.1 encoded AlgorithmIdentifier
+ * object.
+ *
+ * @param blob			ASN.1 encoded AlgorithmIdentifier
+ * @param level0		ASN.1 parser level
+ * @return				pkcs5_t object, NULL on failure
+ */
+pkcs5_t *pkcs5_from_algorithmIdentifier(chunk_t blob, int level0);
+
+#endif /** PKCS5_H_ @}*/