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diff --git a/src/libcharon/sa/authenticators/authenticator.h b/src/libcharon/sa/authenticators/authenticator.h
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+++ b/src/libcharon/sa/authenticators/authenticator.h
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+/*
+ * Copyright (C) 2005-2009 Martin Willi
+ * Copyright (C) 2008 Tobias Brunner
+ * 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.
+ */
+
+/**
+ * @defgroup authenticator authenticator
+ * @{ @ingroup authenticators
+ */
+
+#ifndef AUTHENTICATOR_H_
+#define AUTHENTICATOR_H_
+
+typedef enum auth_method_t auth_method_t;
+typedef enum auth_class_t auth_class_t;
+typedef struct authenticator_t authenticator_t;
+
+#include <library.h>
+#include <config/auth_cfg.h>
+#include <sa/ike_sa.h>
+
+/**
+ * Method to use for authentication, as defined in IKEv2.
+ */
+enum auth_method_t {
+	/**
+	 * Computed as specified in section 2.15 of RFC using
+	 * an RSA private key over a PKCS#1 padded hash.
+	 */
+	AUTH_RSA = 1,
+
+	/**
+	 * Computed as specified in section 2.15 of RFC using the
+	 * shared key associated with the identity in the ID payload
+	 * and the negotiated prf function
+	 */
+	AUTH_PSK = 2,
+
+	/**
+	 * Computed as specified in section 2.15 of RFC using a
+	 * DSS private key over a SHA-1 hash.
+	 */
+	AUTH_DSS = 3,
+
+	/**
+	 * ECDSA with SHA-256 on the P-256 curve as specified in RFC 4754
+	 */
+	AUTH_ECDSA_256 = 9,
+
+	/**
+	 * ECDSA with SHA-384 on the P-384 curve as specified in RFC 4754
+	 */
+	AUTH_ECDSA_384 = 10,
+
+	/**
+	 * ECDSA with SHA-512 on the P-521 curve as specified in RFC 4754
+	 */
+	AUTH_ECDSA_521 = 11,
+};
+
+/**
+ * enum names for auth_method_t.
+ */
+extern enum_name_t *auth_method_names;
+
+/**
+ * Class of authentication to use. This is different to auth_method_t in that
+ * it does not specify a method, but a class of acceptable methods. The found
+ * certificate finally dictates wich method is used.
+ */
+enum auth_class_t {
+	/** any class acceptable */
+	AUTH_CLASS_ANY = 0,
+	/** authentication using public keys (RSA, ECDSA) */
+	AUTH_CLASS_PUBKEY = 1,
+	/** authentication using a pre-shared secrets */
+	AUTH_CLASS_PSK = 2,
+	/** authentication using EAP */
+	AUTH_CLASS_EAP = 3,
+};
+
+/**
+ * enum strings for auth_class_t
+ */
+extern enum_name_t *auth_class_names;
+
+/**
+ * Authenticator interface implemented by the various authenticators.
+ *
+ * An authenticator implementation handles AUTH and EAP payloads. Received
+ * messages are passed to the process() method, to send authentication data
+ * the message is passed to the build() method.
+ */
+struct authenticator_t {
+
+	/**
+	 * Process an incoming message using the authenticator.
+	 *
+	 * @param message		message containing authentication payloads
+	 * @return
+	 *						- SUCCESS if authentication successful
+	 *						- FAILED if authentication failed
+	 *						- NEED_MORE if another exchange required
+	 */
+	status_t (*process)(authenticator_t *this, message_t *message);
+
+	/**
+	 * Attach authentication data to an outgoing message.
+	 *
+	 * @param message		message to add authentication data to
+	 * @return
+	 *						- SUCCESS if authentication successful
+	 *						- FAILED if authentication failed
+	 *						- NEED_MORE if another exchange required
+	 */
+	status_t (*build)(authenticator_t *this, message_t *message);
+
+	/**
+	 * Check if the authenticator is capable of mutual authentication.
+	 *
+	 * Some authenticator authenticate both peers, e.g. EAP. To support
+	 * mutual authentication with only a single authenticator (EAP-only
+	 * authentication), it must be mutual. This method is invoked in ike_auth
+	 * to check if the given authenticator is capable of doing so.
+	 */
+	bool (*is_mutual)(authenticator_t *this);
+
+	/**
+	 * Destroy authenticator instance.
+	 */
+	void (*destroy) (authenticator_t *this);
+};
+
+/**
+ * Create an authenticator to build signatures.
+ *
+ * @param ike_sa			associated ike_sa
+ * @param cfg				authentication configuration
+ * @param received_nonce	nonce received in IKE_SA_INIT
+ * @param sent_nonce		nonce sent in IKE_SA_INIT
+ * @param received_init		received IKE_SA_INIT message data
+ * @param sent_init			sent IKE_SA_INIT message data
+ * @return					authenticator, NULL if not supported
+ */
+authenticator_t *authenticator_create_builder(
+									ike_sa_t *ike_sa, auth_cfg_t *cfg,
+									chunk_t received_nonce, chunk_t sent_nonce,
+									chunk_t received_init, chunk_t sent_init);
+
+/**
+ * Create an authenticator to verify signatures.
+ *
+ * @param ike_sa			associated ike_sa
+ * @param message			message containing authentication data
+ * @param received_nonce	nonce received in IKE_SA_INIT
+ * @param sent_nonce		nonce sent in IKE_SA_INIT
+ * @param received_init		received IKE_SA_INIT message data
+ * @param sent_init			sent IKE_SA_INIT message data
+ * @return					authenticator, NULL if not supported
+ */
+authenticator_t *authenticator_create_verifier(
+									ike_sa_t *ike_sa, message_t *message,
+									chunk_t received_nonce, chunk_t sent_nonce,
+									chunk_t received_init, chunk_t sent_init);
+
+#endif /** AUTHENTICATOR_H_ @}*/