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diff --git a/src/libstrongswan/plugins/openssl/openssl_hmac.h b/src/libstrongswan/plugins/openssl/openssl_hmac.h
new file mode 100644
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+++ b/src/libstrongswan/plugins/openssl/openssl_hmac.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2012 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 openssl_hmac openssl_hmac
+ * @{ @ingroup openssl_p
+ */
+
+#ifndef OPENSSL_HMAC_H_
+#define OPENSSL_HMAC_H_
+
+typedef struct openssl_hmac_t openssl_hmac_t;
+
+#include <crypto/hashers/hasher.h>
+
+/**
+ * Simple wrapper around OpenSSL's functions to calculate HMAC message
+ * authentication codes
+ */
+struct openssl_hmac_t {
+
+	/**
+	 * Generate message authentication code.
+	 *
+	 * If out is NULL, no result is given back.  A next call will
+	 * append the data to already supplied data.  If out is not NULL,
+	 * the mac of all apended data is calculated, written to out and the
+	 * internal state is reset.
+	 *
+	 * @param data		chunk of data to authenticate
+	 * @param out		pointer where the generated bytes will be written
+	 */
+	void (*get_mac)(openssl_hmac_t *this, chunk_t data, u_int8_t *out);
+
+	/**
+	 * Generates message authentication code and allocates memory for it.
+	 *
+	 * If out is NULL, no result is given back.  A next call will
+	 * append the data to already supplied data.  If out is not NULL,
+	 * the mac of all apended data is calculated, returned in out and the
+	 * internal state is reset;
+	 *
+	 * @param data		chunk of data to authenticate
+	 * @param out		chunk which will hold generated bytes
+	 */
+	void (*allocate_mac)(openssl_hmac_t *this, chunk_t data, chunk_t *out);
+
+	/**
+	 * Get the size of the resulting MAC.
+	 *
+	 * @return			block size in bytes
+	 */
+	size_t (*get_block_size)(openssl_hmac_t *this);
+
+	/**
+	 * Set the key to be used for the HMAC.
+	 *
+	 * Any key length is accepted.
+	 *
+	 * @param key		key to set
+	 */
+	void (*set_key)(openssl_hmac_t *this, chunk_t key);
+
+	/**
+	 * Destroys an openssl_hmac_t object.
+	 */
+	void (*destroy)(openssl_hmac_t *this);
+};
+
+/**
+ * Creates a new openssl_hmac_t object.
+ *
+ * @param algo			hash algorithm to use
+ * @return				openssl_hmac_t object, NULL if not supported
+ */
+openssl_hmac_t *openssl_hmac_create(hash_algorithm_t algo);
+
+#endif /** OPENSSL_HMAC_H_ @}*/