/*
 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

/* $Id: der.h,v 1.4 2003/07/15 23:16:42 shadow Exp $ */

#ifndef __DER_H__
#define __DER_H__

#include <time.h>

typedef enum { UNIV = 0, APPL = 1, Der_CONTEXT = 2, PRIVATE = 3 } Der_class;

typedef enum { PRIM = 0, CONS = 1 } Der_type;

/* Universal tags */

enum {
    UT_Boolean = 1,
    UT_Integer = 2,
    UT_BitString = 3,
    UT_OctetString = 4,
    UT_Null = 5,
    UT_OID = 6,
    UT_Enumerated = 10,
    UT_Sequence = 16,
    UT_Set = 17,
    UT_PrintableString = 19,
    UT_IA5String = 22,
    UT_UTCTime = 23,
    UT_GeneralizedTime = 24,
    UT_VisibleString = 26,
    UT_GeneralString = 27
};

#define ASN1_INDEFINITE 0xdce0deed

#ifndef HAVE_TIMEGM
time_t timegm(struct tm *);
#endif

int time2generalizedtime(time_t t, octet_string * s);

int der_get_int(const unsigned char *p, size_t len, int *ret, size_t * size);
int der_get_length(const unsigned char *p, size_t len, size_t * val,
		   size_t * size);
int der_get_general_string(const unsigned char *p, size_t len,
			   general_string * str, size_t * size);
int der_get_octet_string(const unsigned char *p, size_t len,
			 octet_string * data, size_t * size);
int der_get_oid(const unsigned char *p, size_t len, oid * data,
		size_t * size);
int der_get_tag(const unsigned char *p, size_t len, Der_class * class,
		Der_type * type, int *tag, size_t * size);

int der_match_tag(const unsigned char *p, size_t len, Der_class class,
		  Der_type type, int tag, size_t * size);
int der_match_tag_and_length(const unsigned char *p, size_t len,
			     Der_class class, Der_type type, int tag,
			     size_t * length_ret, size_t * size);

int decode_integer(const unsigned char *, size_t, int *, size_t *);
int decode_unsigned(const unsigned char *, size_t, unsigned *, size_t *);
int decode_enumerated(const unsigned char *, size_t, unsigned *, size_t *);
int decode_general_string(const unsigned char *, size_t, general_string *,
			  size_t *);
int decode_oid(const unsigned char *p, size_t len, oid * k, size_t * size);
int decode_octet_string(const unsigned char *, size_t, octet_string *,
			size_t *);
int decode_generalized_time(const unsigned char *, size_t, time_t *,
			    size_t *);

int der_put_int(unsigned char *p, size_t len, int val, size_t *);
int der_put_length(unsigned char *p, size_t len, size_t val, size_t *);
int der_put_general_string(unsigned char *p, size_t len,
			   const general_string * str, size_t *);
int der_put_octet_string(unsigned char *p, size_t len,
			 const octet_string * data, size_t *);
int der_put_oid(unsigned char *p, size_t len, const oid * data,
		size_t * size);
int der_put_tag(unsigned char *p, size_t len, Der_class class, Der_type type,
		int tag, size_t *);
int der_put_length_and_tag(unsigned char *, size_t, size_t, Der_class,
			   Der_type, int, size_t *);

int encode_integer(unsigned char *p, size_t len, const int *data, size_t *);
int encode_unsigned(unsigned char *p, size_t len, const unsigned *data,
		    size_t *);
int encode_enumerated(unsigned char *p, size_t len, const unsigned *data,
		      size_t *);
int encode_general_string(unsigned char *p, size_t len,
			  const general_string * data, size_t *);
int encode_octet_string(unsigned char *p, size_t len, const octet_string * k,
			size_t *);
int encode_oid(unsigned char *p, size_t len, const oid * k, size_t *);
int encode_generalized_time(unsigned char *p, size_t len, const time_t * t,
			    size_t *);

void free_integer(int *num);
void free_general_string(general_string * str);
void free_octet_string(octet_string * k);
void free_oid(oid * k);
void free_generalized_time(time_t * t);

size_t length_len(size_t len);
size_t length_integer(const int *data);
size_t length_unsigned(const unsigned *data);
size_t length_enumerated(const unsigned *data);
size_t length_general_string(const general_string * data);
size_t length_octet_string(const octet_string * k);
size_t length_oid(const oid * k);
size_t length_generalized_time(const time_t * t);

int copy_general_string(const general_string * from, general_string * to);
int copy_octet_string(const octet_string * from, octet_string * to);
int copy_oid(const oid * from, oid * to);

int fix_dce(size_t reallen, size_t * len);

#endif /* __DER_H__ */