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diff --git a/src/libstrongswan/credentials/cert_validator.h b/src/libstrongswan/credentials/cert_validator.h
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+++ b/src/libstrongswan/credentials/cert_validator.h
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+/*
+ * Copyright (C) 2010 Martin Willi
+ * Copyright (C) 2010 revosec AG
+ *
+ * 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_validator cert_validator
+ * @{ @ingroup credentials
+ */
+
+#ifndef CERT_VALIDATOR_H_
+#define CERT_VALIDATOR_H_
+
+typedef struct cert_validator_t cert_validator_t;
+
+#include <library.h>
+
+/**
+ * Certificate validator interface.
+ *
+ * A certificate validator checks constraints or revocation in a certificate
+ * or its issuing CA certificate. The interface allows plugins to do
+ * revocation checking or similar tasks.
+ */
+struct cert_validator_t {
+
+	/**
+	 * Validate a subject certificate in relation to its issuer.
+	 *
+	 * @param subject		subject certificate to check
+	 * @param issuer		issuer of subject
+	 * @param online		wheter to do online revocation checking
+	 * @param pathlen		the current length of the path up to the root CA
+	 * @param auth			container for resulting authentication info
+	 */
+	bool (*validate)(cert_validator_t *this, certificate_t *subject,
+					 certificate_t *issuer, bool online, int pathlen,
+					 auth_cfg_t *auth);
+};
+
+#endif /** CERT_VALIDATOR_H_ @}*/