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diff --git a/src/libstrongswan/credentials/sets/cert_cache.h b/src/libstrongswan/credentials/sets/cert_cache.h
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+++ b/src/libstrongswan/credentials/sets/cert_cache.h
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+/*
+ * Copyright (C) 2008 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.
+ */
+
+/**
+ * @defgroup cert_cache cert_cache
+ * @{ @ingroup sets
+ */
+
+#ifndef CERT_CACHE_H_
+#define CERT_CACHE_H_
+
+#include <credentials/credential_set.h>
+
+typedef struct cert_cache_t cert_cache_t;
+
+/**
+ * Certificate signature verification and certificate cache.
+ *
+ * This cache serves all certificates seen in its issued_by method
+ * and serves them as untrusted through the credential set interface. Further,
+ * it caches valid subject-issuer relationships to speed up the issued_by
+ * method.
+ */
+struct cert_cache_t {
+
+	/**
+	 * Implements credential_set_t.
+	 */
+	credential_set_t set;
+
+	/**
+	 * Caching wrapper around certificate_t.issued_by.
+	 *
+	 * @param subject		certificate to verify
+	 * @param issuer		issuing certificate to verify subject
+	 * @return				TRUE if subject issued by issuer
+	 */
+	bool (*issued_by)(cert_cache_t *this,
+					  certificate_t *subject, certificate_t *issuer);
+
+	/**
+	 * Flush the certificate cache.
+	 *
+	 * @param type			type of certificate to flush, or CERT_ANY
+	 */
+	void (*flush)(cert_cache_t *this, certificate_type_t type);
+
+	/**
+	 * Destroy a cert_cache instance.
+	 */
+	void (*destroy)(cert_cache_t *this);
+};
+
+/**
+ * Create a cert_cache instance.
+ */
+cert_cache_t *cert_cache_create();
+
+#endif /** CERT_CACHE_H_ @}*/