1/*
2 * ASN.1 DER parsing
3 * Copyright (c) 2006, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#ifndef ASN1_H
10#define ASN1_H
11
12#define ASN1_TAG_EOC		0x00 /* not used with DER */
13#define ASN1_TAG_BOOLEAN	0x01
14#define ASN1_TAG_INTEGER	0x02
15#define ASN1_TAG_BITSTRING	0x03
16#define ASN1_TAG_OCTETSTRING	0x04
17#define ASN1_TAG_NULL		0x05
18#define ASN1_TAG_OID		0x06
19#define ASN1_TAG_OBJECT_DESCRIPTOR	0x07 /* not yet parsed */
20#define ASN1_TAG_EXTERNAL	0x08 /* not yet parsed */
21#define ASN1_TAG_REAL		0x09 /* not yet parsed */
22#define ASN1_TAG_ENUMERATED	0x0A /* not yet parsed */
23#define ASN1_TAG_UTF8STRING	0x0C /* not yet parsed */
24#define ANS1_TAG_RELATIVE_OID	0x0D
25#define ASN1_TAG_SEQUENCE	0x10 /* shall be constructed */
26#define ASN1_TAG_SET		0x11
27#define ASN1_TAG_NUMERICSTRING	0x12 /* not yet parsed */
28#define ASN1_TAG_PRINTABLESTRING	0x13
29#define ASN1_TAG_TG1STRING	0x14 /* not yet parsed */
30#define ASN1_TAG_VIDEOTEXSTRING	0x15 /* not yet parsed */
31#define ASN1_TAG_IA5STRING	0x16
32#define ASN1_TAG_UTCTIME	0x17
33#define ASN1_TAG_GENERALIZEDTIME	0x18 /* not yet parsed */
34#define ASN1_TAG_GRAPHICSTRING	0x19 /* not yet parsed */
35#define ASN1_TAG_VISIBLESTRING	0x1A
36#define ASN1_TAG_GENERALSTRING	0x1B /* not yet parsed */
37#define ASN1_TAG_UNIVERSALSTRING	0x1C /* not yet parsed */
38#define ASN1_TAG_BMPSTRING	0x1D /* not yet parsed */
39
40#define ASN1_CLASS_UNIVERSAL		0
41#define ASN1_CLASS_APPLICATION		1
42#define ASN1_CLASS_CONTEXT_SPECIFIC	2
43#define ASN1_CLASS_PRIVATE		3
44
45
46struct asn1_hdr {
47	const u8 *payload;
48	u8 identifier, class, constructed;
49	unsigned int tag, length;
50};
51
52#define ASN1_MAX_OID_LEN 20
53struct asn1_oid {
54	unsigned long oid[ASN1_MAX_OID_LEN];
55	size_t len;
56};
57
58
59int asn1_get_next(const u8 *buf, size_t len, struct asn1_hdr *hdr);
60int asn1_parse_oid(const u8 *buf, size_t len, struct asn1_oid *oid);
61int asn1_get_oid(const u8 *buf, size_t len, struct asn1_oid *oid,
62		 const u8 **next);
63void asn1_oid_to_str(const struct asn1_oid *oid, char *buf, size_t len);
64unsigned long asn1_bit_string_to_long(const u8 *buf, size_t len);
65int asn1_oid_equal(const struct asn1_oid *a, const struct asn1_oid *b);
66
67extern struct asn1_oid asn1_sha1_oid;
68extern struct asn1_oid asn1_sha256_oid;
69
70#endif /* ASN1_H */
71