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/* $OpenBSD: asn.h,v 1.4 1999/04/19 20:01:48 niklas Exp $ */
/* $EOM: asn.h,v 1.18 1999/04/05 18:27:32 niklas Exp $ */
/*
* Copyright (c) 1998 Niels Provos. All rights reserved.
* Copyright (c) 1999 Niklas Hallqvist. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Ericsson Radio Systems.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#ifndef _ASN_H_
#define _ASN_H_
/* Very very simple module for compiling ASN.1 BER encoding */
enum asn_classes {
UNIVERSAL = 0,
APPLICATION = 1,
CONTEXT = 2,
PRIVATE = 3
};
#define TAG_EXPLICIT 4
#define TAG_EXPSHIFTS 5
#define ISEXPLICIT(x) ((x)->class & TAG_EXPLICIT)
#define ADD_EXP(x,y) ((x << TAG_EXPSHIFTS) | TAG_EXPLICIT | (y))
#define GET_EXP(x) ((x)->class >> TAG_EXPSHIFTS)
enum asn_tags {
TAG_BOOL = 1,
TAG_INTEGER = 2,
TAG_BITSTRING = 3,
TAG_OCTETSTRING = 4,
TAG_NULL = 5,
TAG_OBJECTID = 6, /* Internal Representation as ASCII String */
TAG_SEQUENCE = 16,
TAG_SET = 17,
TAG_PRINTSTRING = 19,
TAG_UTCTIME = 23, /* Represenation as ASCII String */
TAG_STOP = -1, /* None official ASN tag, indicates end */
TAG_RAW = -2, /* Placeholder for something we cant handle */
TAG_ANY = -3, /* Either we can handle it or it is RAW */
};
struct norm_type {
enum asn_tags type;
enum asn_classes class;
const char *name;
u_int32_t len;
void *data;
u_int32_t flags;
};
struct asn_objectid {
char *name;
char *objectid;
};
struct asn_handler {
enum asn_tags type;
void (*deallocate) (struct norm_type *);
u_int32_t (*get_encoded_len) (struct norm_type *, u_int8_t *type);
u_int8_t *(*decode) (u_int8_t *, u_int32_t, struct norm_type *);
u_int8_t *(*encode) (struct norm_type *, u_int8_t *);
};
#define ASN_FLAG_ZEROORMORE 0x0001
/* Construct a Sequence */
#define SEQ(x,y) {TAG_SEQUENCE, UNIVERSAL, x, 0, y}
#define SEQOF(x,y) {TAG_SEQUENCE, UNIVERSAL, x, 0, y, ASN_FLAG_ZEROORMORE}
#define SET(x,y) {TAG_SET, UNIVERSAL, x, 0, y}
#define SETOF(x,y) {TAG_SET, UNIVERSAL, x, 0, y, ASN_FLAG_ZEROORMORE}
#define TAG_TYPE(x) ((enum asn_tags)((x)[0] & 0x1f))
/* Tag modifiers */
#define ASN_CONSTRUCTED 0x20 /* Constructed object type */
/* Length modifiers */
#define ASN_LONG_FORM 0x80 /* Number of length octets */
/* Function prototypes */
u_int8_t *asn_encode_integer (struct norm_type *, u_int8_t *);
u_int8_t *asn_decode_integer (u_int8_t *, u_int32_t, struct norm_type *);
u_int32_t asn_get_encoded_len_integer (struct norm_type *, u_int8_t *);
void asn_free_integer (struct norm_type *);
u_int8_t *asn_encode_string (struct norm_type *, u_int8_t *);
u_int8_t *asn_decode_string (u_int8_t *, u_int32_t, struct norm_type *);
u_int32_t asn_get_encoded_len_string (struct norm_type *, u_int8_t *);
void asn_free_string (struct norm_type *);
u_int8_t *asn_encode_objectid (struct norm_type *, u_int8_t *);
u_int8_t *asn_decode_objectid (u_int8_t *, u_int32_t, struct norm_type *);
u_int32_t asn_get_encoded_len_objectid (struct norm_type *, u_int8_t *);
void asn_free_objectid (struct norm_type *);
u_int8_t *asn_encode_raw (struct norm_type *, u_int8_t *);
u_int8_t *asn_decode_raw (u_int8_t *, u_int32_t, struct norm_type *);
u_int32_t asn_get_encoded_len_raw (struct norm_type *, u_int8_t *);
void asn_free_raw (struct norm_type *);
u_int8_t *asn_encode_null (struct norm_type *, u_int8_t *);
u_int8_t *asn_decode_null (u_int8_t *, u_int32_t, struct norm_type *);
u_int32_t asn_get_encoded_len_null (struct norm_type *, u_int8_t *);
void asn_free_null (struct norm_type *);
u_int8_t *asn_encode_sequence (struct norm_type *, u_int8_t *);
u_int8_t *asn_decode_sequence (u_int8_t *, u_int32_t, struct norm_type *);
u_int32_t asn_get_encoded_len_sequence (struct norm_type *, u_int8_t *);
void asn_free_sequence (struct norm_type *);
u_int8_t *asn_decode_any (u_int8_t *, u_int32_t, struct norm_type *);
void asn_free (struct norm_type *);
int asn_get_from_file (char *, u_int8_t **, u_int32_t *);
struct norm_type *asn_template_clone (struct norm_type *, int);
u_int32_t asn_sizeinoctets (u_int32_t);
u_int32_t asn_get_len (u_int8_t *);
u_int32_t asn_get_data_len (struct norm_type *, u_int8_t **, u_int8_t **);
u_int32_t asn_get_encoded_len (struct norm_type *, u_int32_t, u_int8_t *);
char *asn_parse_objectid (struct asn_objectid *, char *);
struct norm_type *asn_decompose (char *, struct norm_type *);
#endif /* _ASN_H_ */
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