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diff --git a/src/libstrongswan/crypto/crl.h b/src/libstrongswan/crypto/crl.h
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+++ b/src/libstrongswan/crypto/crl.h
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+/**
+ * @file crl.h
+ * 
+ * @brief Interface of crl_t.
+ * 
+ */
+
+/*
+ * Copyright (C) 2006 Andreas Steffen
+ * 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 CRL_H_
+#define CRL_H_
+
+typedef struct crl_t crl_t;
+
+#include <library.h>
+#include <crypto/rsa/rsa_public_key.h>
+#include <crypto/certinfo.h>
+#include <utils/identification.h>
+#include <utils/iterator.h>
+
+/**
+ * @brief X.509 certificate revocation list
+ * 
+ * @b Constructors:
+ *  - crl_create_from_chunk()
+ *  - crl_create_from_file()
+ * 
+ * @ingroup transforms
+ */
+struct crl_t {
+
+	/**
+	 * @brief Get the crl's issuer ID.
+	 * 
+	 * The resulting ID is always a identification_t
+	 * of type ID_DER_ASN1_DN.
+	 * 
+	 * @param this				calling object
+	 * @return					issuers ID
+	 */
+	identification_t *(*get_issuer) (const crl_t *this);
+
+	/**
+	 * @brief Check if both crls have the same issuer.
+	 * 
+	 * @param this				calling object
+	 * @param other				other crl
+	 * @return					TRUE if the same issuer
+	 */
+	bool (*equals_issuer) (const crl_t *this, const crl_t *other);
+
+	/**
+	 * @brief Check if ia candidate cert is the issuer of the crl
+	 * 
+	 * @param this				calling object
+	 * @param issuer			candidate issuer of the crl
+	 * @return					TRUE if issuer
+	 */
+	bool (*is_issuer) (const crl_t *this, const x509_t *issuer);
+
+	/**
+	 * @brief Checks the validity interval of the crl
+	 * 
+	 * @param this			calling object
+	 * @return				TRUE if the crl is valid
+	 */
+	bool (*is_valid) (const crl_t *this);
+	
+	/**
+	 * @brief Checks if this crl is newer (thisUpdate) than the other crl
+	 * 
+	 * @param this			calling object
+	 * @param other			other crl object
+	 * @return				TRUE if this was issued more recently than other
+	 */
+	bool (*is_newer) (const crl_t *this, const crl_t *other);
+	
+	/**
+	 * @brief Check if a crl is trustworthy.
+	 * 
+	 * @param this			calling object
+	 * @param signer		signer's RSA public key
+	 * @return				TRUE if crl is trustworthy
+	 */
+	bool (*verify) (const crl_t *this, const rsa_public_key_t *signer);
+
+	/**
+	 * @brief Get the certificate status
+	 * 
+	 * @param this			calling object
+	 * @param certinfo		certinfo is updated
+	 */
+	void (*get_status) (const crl_t *this, certinfo_t *certinfo);
+
+	/**
+	 * @brief Write a der-encoded crl to a file
+	 * 
+	 * @param this			calling object
+	 * @param path			path where the file is to be stored
+	 * @param mask			file access control rights
+	 * @param force			overwrite the file if it already exists
+	 * @return				TRUE if successfully written
+	 */
+	bool (*write_to_file) (const crl_t *this, const char *path, mode_t mask, bool force);
+
+	/**
+	 * @brief Destroys the crl.
+	 * 
+	 * @param this			crl to destroy
+	 */
+	void (*destroy) (crl_t *this);
+};
+
+/**
+ * @brief Read a x509 crl from a DER encoded blob.
+ * 
+ * @param chunk 	chunk containing DER encoded data
+ * @return 			created crl_t, or NULL if invalid.
+ * 
+ * @ingroup transforms
+ */
+crl_t *crl_create_from_chunk(chunk_t chunk);
+
+/**
+ * @brief Read a x509 crl from a DER encoded file.
+ * 
+ * @param filename 	file containing DER encoded data
+ * @return 			created crl_t, or NULL if invalid.
+ * 
+ * @ingroup transforms
+ */
+crl_t *crl_create_from_file(const char *filename);
+
+#endif /* CRL_H_ */