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diff --git a/Source/charon/asn1/der_decoder.h b/Source/charon/asn1/der_decoder.h
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+++ b/Source/charon/asn1/der_decoder.h
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+/**
+ * @file der_decoder.h
+ *
+ * @brief Interface of der_decoder_t.
+ *
+ */
+
+/*
+ * Copyright (C) 2006 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.
+ */
+
+#ifndef DER_DECODER_H_
+#define DER_DECODER_H_
+
+#include <types.h>
+#include <asn1/asn1.h>
+
+typedef struct der_decoder_t der_decoder_t;
+
+/**
+ * @brief Decode der_encoded bytes to usable structures.
+ * 
+ * @b Constructors:
+ *  - der_decoder_create()
+ * 
+ * @ingroup asn1
+ */
+struct der_decoder_t {
+	
+	status_t (*decode) (der_decoder_t *this, chunk_t input, void *output);
+
+	/**
+	 * @brief Destroys a der_decoder object.
+	 *
+	 * @param der_decoder 	calling object
+	 */
+	void (*destroy) (der_decoder_t *this);
+};
+
+
+/**
+ * @brief Create a der_decoder instance.
+ * 
+ * @return	der_decoder_t object
+ * 
+ * @ingroup ans1
+ */
+der_decoder_t * der_decoder_create(asn1_rule_t* rules);
+
+#endif /* DER_DECODER_H_ */