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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_EMBEDDED_PDV	0x0B /* not yet parsed */
24 #define ASN1_TAG_UTF8STRING	0x0C /* not yet parsed */
25 #define ANS1_TAG_RELATIVE_OID	0x0D
26 #define ASN1_TAG_SEQUENCE	0x10 /* shall be constructed */
27 #define ASN1_TAG_SET		0x11
28 #define ASN1_TAG_NUMERICSTRING	0x12 /* not yet parsed */
29 #define ASN1_TAG_PRINTABLESTRING	0x13
30 #define ASN1_TAG_TG1STRING	0x14 /* not yet parsed */
31 #define ASN1_TAG_VIDEOTEXSTRING	0x15 /* not yet parsed */
32 #define ASN1_TAG_IA5STRING	0x16
33 #define ASN1_TAG_UTCTIME	0x17
34 #define ASN1_TAG_GENERALIZEDTIME	0x18 /* not yet parsed */
35 #define ASN1_TAG_GRAPHICSTRING	0x19 /* not yet parsed */
36 #define ASN1_TAG_VISIBLESTRING	0x1A
37 #define ASN1_TAG_GENERALSTRING	0x1B /* not yet parsed */
38 #define ASN1_TAG_UNIVERSALSTRING	0x1C /* not yet parsed */
39 #define ASN1_TAG_CHARACTERSTRING	0x1D /* not yet parsed */
40 #define ASN1_TAG_BMPSTRING	0x1E /* not yet parsed */
41 
42 #define ASN1_CLASS_UNIVERSAL		0
43 #define ASN1_CLASS_APPLICATION		1
44 #define ASN1_CLASS_CONTEXT_SPECIFIC	2
45 #define ASN1_CLASS_PRIVATE		3
46 
47 
48 struct asn1_hdr {
49 	const u8 *payload;
50 	u8 identifier, class, constructed;
51 	unsigned int tag, length;
52 };
53 
54 #define ASN1_MAX_OID_LEN 20
55 struct asn1_oid {
56 	unsigned long oid[ASN1_MAX_OID_LEN];
57 	size_t len;
58 };
59 
60 
61 int asn1_get_next(const u8 *buf, size_t len, struct asn1_hdr *hdr);
62 int asn1_parse_oid(const u8 *buf, size_t len, struct asn1_oid *oid);
63 int asn1_get_oid(const u8 *buf, size_t len, struct asn1_oid *oid,
64 		 const u8 **next);
65 void asn1_oid_to_str(const struct asn1_oid *oid, char *buf, size_t len);
66 unsigned long asn1_bit_string_to_long(const u8 *buf, size_t len);
67 int asn1_oid_equal(const struct asn1_oid *a, const struct asn1_oid *b);
68 
69 extern struct asn1_oid asn1_sha1_oid;
70 extern struct asn1_oid asn1_sha256_oid;
71 
72 #endif /* ASN1_H */
73