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diff --git a/src/libstrongswan/crypto/pkcs9.h b/src/libstrongswan/crypto/pkcs9.h
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+++ b/src/libstrongswan/crypto/pkcs9.h
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+/**
+ * @file pkcs7.h
+ * 
+ * @brief Interface of pkcs9_t.
+ * 
+ */
+
+/*
+  * Copyright (C) 2008 Andreas Steffen
+ *
+ * Hochschule fuer Technik Rapperswil, Switzerland
+ *
+ * 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.
+ *
+ * RCSID $Id: pkcs7.h 3423 2008-01-22 10:32:37Z andreas $
+ */
+
+#ifndef _PKCS9_H
+#define _PKCS9_H
+
+typedef struct pkcs9_t pkcs9_t;
+
+#include <library.h>
+
+/**
+ * @brief PKCS#9 .
+ * 
+ * @b Constructors:
+ *  -pkcs9_create_from_chunk()
+ *  -pkcs9_create()
+ *
+ * @ingroup crypto
+ */
+struct pkcs9_t {
+	/**
+	 * @brief generate ASN.1 encoding of attribute list
+	 *
+	 * @param this			PKCS#9 attribute list to be encoded
+	 */
+	void (*build_encoding) (pkcs9_t *this);
+
+	/**
+	 * @brief gets ASN.1 encoding of PKCS#9 attribute list
+	 *
+	 * @param this			calling object
+	 * @return				ASN.1 encoded PKCSI#9 list
+	 */
+	chunk_t (*get_encoding) (pkcs9_t *this);
+
+	/**
+	 * @brief gets a PKCS#9 attribute
+	 *
+	 * @param this			calling object
+	 * @param oid			OID of the attribute
+	 * @return				ASN.1 encoded value of the attribute
+	 */
+	chunk_t (*get_attribute) (pkcs9_t *this, int oid);
+
+	/**
+	 * @brief adds a PKCS#9 attribute
+	 *
+	 * @param this			calling object
+	 * @param oid			OID of the attribute
+	 * @param value			ASN.1 encoded value of the attribute 
+	 */
+	void (*set_attribute) (pkcs9_t *this, int oid, chunk_t value);
+
+	/**
+	 * @brief gets a PKCS#9 messageDigest attribute
+	 *
+	 * @param this			calling object
+	 * @return				messageDigest
+	 */
+	chunk_t (*get_messageDigest) (pkcs9_t *this);
+
+	/**
+	 * @brief add a PKCS#9 messageDigest attribute
+	 *
+	 * @param this			calling object
+	 * @param value			messageDigest 
+	 */
+	void (*set_messageDigest) (pkcs9_t *this, chunk_t value);
+
+	/**
+	 * @brief Destroys the PKCS#9 attribute list.
+	 *
+	 * @param this			PKCS#9 attribute list to destroy
+	 */
+	void (*destroy) (pkcs9_t *this);
+};
+
+/**
+ * @brief Read a PKCS#9 attribute list from a DER encoded chunk.
+ * 
+ * @param chunk		chunk containing DER encoded data
+ * @param level		ASN.1 parsing start level
+ * @return 			created pkcs9 attribute list, or NULL if invalid.
+ * 
+ * @ingroup crypto
+ */
+pkcs9_t *pkcs9_create_from_chunk(chunk_t chunk, u_int level);
+
+/**
+ * @brief Create an empty PKCS#9 attribute list
+ * 
+ * @param chunk			chunk containing data
+ * @return 				created pkcs9 attribute list.
+ * 
+ * @ingroup crypto
+ */
+pkcs9_t *pkcs9_create(void);
+
+#endif /* _PKCS9_H */