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diff --git a/src/libstrongswan/credentials/certificates/x509.h b/src/libstrongswan/credentials/certificates/x509.h
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+++ b/src/libstrongswan/credentials/certificates/x509.h
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+/*
+ * Copyright (C) 2007-2008 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.
+ *
+ * $Id: x509.h 3656 2008-03-25 22:28:27Z andreas $
+ */
+
+/**
+ * @defgroup x509 x509
+ * @{ @ingroup certificates
+ */
+
+#ifndef X509_H_
+#define X509_H_
+
+#include <utils/enumerator.h>
+#include <credentials/certificates/certificate.h>
+
+typedef struct x509_t x509_t;
+typedef enum x509_flag_t x509_flag_t;
+
+/**
+ * X.509 certificate flags.
+ */
+enum x509_flag_t {
+	/** cert has CA constraint */
+	X509_CA = 			(1<<0),
+	/** cert has AA constraint */
+	X509_AA = 			(1<<1),
+	/** cert has OCSP signer constraint */
+	X509_OCSP_SIGNER = 	(1<<2),
+	/** cert is self-signed */
+	X509_SELF_SIGNED =  (1<<3),
+};
+
+/**
+ * enum names for x509 flags
+ */
+extern enum_name_t *x509_flag_names;
+
+/**
+ * X.509 certificate interface.
+ *
+ * This interface adds additional methods to the certificate_t type to
+ * allow further operations on these certificates.
+ */
+struct x509_t {
+
+	/**
+	 * Implements certificate_t.
+	 */
+	certificate_t interface;
+	
+	/**
+	 * Get the flags set for this certificate.
+	 *
+	 * @return			set of flags
+	 */
+	x509_flag_t (*get_flags)(x509_t *this);
+	
+	/**
+	 * Get the certificate serial number.
+	 *
+	 * @return			chunk pointing to internal serial number
+	 */
+	chunk_t (*get_serial)(x509_t *this);
+	
+	/**
+	 * Get the the authorityKeyIdentifier.
+	 *
+	 * @return			authKeyIdentifier as identification_t*
+	 */
+	identification_t* (*get_authKeyIdentifier)(x509_t *this);
+	
+	/**
+	 * Create an enumerator over all subjectAltNames.
+	 *
+	 * @return			enumerator over subjectAltNames as identification_t*
+	 */
+	enumerator_t* (*create_subjectAltName_enumerator)(x509_t *this);
+	
+	/**
+	 * Create an enumerator over all CRL URIs.
+	 *
+	 * @return			enumerator over URIs as char*
+	 */
+	enumerator_t* (*create_crl_uri_enumerator)(x509_t *this);
+	
+	/**
+	 * Create an enumerator over all OCSP URIs.
+	 *
+	 * @return			enumerator over URIs as char*
+	 */
+	enumerator_t* (*create_ocsp_uri_enumerator)(x509_t *this);
+};
+
+#endif /* X509_H_ @}*/