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diff --git a/Source/charon/asn1/asn1.h b/Source/charon/asn1/asn1.h
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+++ b/Source/charon/asn1/asn1.h
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+/**
+ * @file asn1.h
+ *
+ * @brief Definition of asn1_type_t and asn1_rule_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 ASN1_H_
+#define ASN1_H_
+
+#include <types.h>
+
+typedef enum asn1_type_t asn1_type_t;
+
+enum asn1_type_t {
+	ASN1_END = 0x00,
+	ASN1_BOOLEAN = 0x01,
+	ASN1_INTEGER = 0x02,
+	ASN1_BIT_STRING = 0x03,
+	ASN1_OCTET_STRING = 0x04,
+	ASN1_NULL = 0x05,
+	ASN1_OID = 0x06,
+	ASN1_ENUMERATED = 0x0A,
+	ASN1_UTF8STRING = 0x0C,
+	ASN1_NUMERICSTRING = 0x12,
+	ASN1_PRINTABLESTRING = 0x13,
+	ASN1_T61STRING = 0x14,
+	ASN1_VIDEOTEXSTRING = 0x15,
+	ASN1_IA5STRING = 0x16,
+	ASN1_UTCTIME = 0x17,
+	ASN1_GENERALIZEDTIME = 0x18,
+	ASN1_GRAPHICSTRING = 0x19,
+	ASN1_VISIBLESTRING = 0x1A,
+	ASN1_GENERALSTRING = 0x1B,
+	ASN1_UNIVERSALSTRING = 0x1C,
+	ASN1_BMPSTRING = 0x1E,
+	ASN1_CONSTRUCTED = 0x20,
+	ASN1_SEQUENCE = 0x30,
+	ASN1_SET = 0x31,
+	ASN1_TAG_E_0 = 0xA0,
+	ASN1_TAG_E_1 = 0xA1,
+	ASN1_TAG_E_2 = 0xA2,
+	ASN1_TAG_E_3 = 0xA3,
+	ASN1_TAG_E_4 = 0xA4,
+	ASN1_TAG_E_5 = 0xA5,
+	ASN1_TAG_E_6 = 0xA6,
+	ASN1_TAG_E_7 = 0xA7,
+	ASN1_TAG_I_1 = 0x81,
+	ASN1_TAG_I_2 = 0x82,
+	ASN1_TAG_I_3 = 0x83,
+	ASN1_TAG_I_4 = 0x84,
+	ASN1_TAG_I_5 = 0x85,
+	ASN1_TAG_I_6 = 0x86,
+	ASN1_TAG_I_7 = 0x87,
+};
+
+extern mapping_t asn1_type_m[];
+
+typedef enum asn1_flag_t asn1_flag_t;
+
+enum asn1_flag_t {
+	ASN1_OPTIONAL = 0x01,
+	ASN1_DEFAULT = 0x02,
+	ASN1_MPZ = 0x04,
+	ASN1_OF = 0x08,
+};
+
+extern mapping_t asn1_flag_m[];
+
+
+typedef struct asn1_rule_t asn1_rule_t;
+
+struct asn1_rule_t {
+	/** 
+	 * ASN1 type 
+	 */
+	asn1_type_t type;
+	/** 
+	 * implicit or explicit tag, if any 
+	 */
+	asn1_flag_t flags;
+	/** 
+	 * offset of data in structure 
+	 */
+	u_int data_offset;
+// 	union {
+		/** 
+		 * offset to a boolean, which says if optional 
+		 * data is available at data_offset. Used if
+		 * flags & ASN1_OPTIONAL.
+		 */
+// 		u_int available_offset;
+		/**
+		 * default value, used if flags & ASN1_DEFAULT
+		 */
+		u_int default_value;
+// 	};
+};
+
+
+#endif /* ASN1_H_ */