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      1 /*
      2  * ASN.1 DER parsing
      3  * Copyright (c) 2006, Jouni Malinen <j (at) 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 
     46 struct 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
     53 struct asn1_oid {
     54 	unsigned long oid[ASN1_MAX_OID_LEN];
     55 	size_t len;
     56 };
     57 
     58 
     59 int asn1_get_next(const u8 *buf, size_t len, struct asn1_hdr *hdr);
     60 int asn1_parse_oid(const u8 *buf, size_t len, struct asn1_oid *oid);
     61 int asn1_get_oid(const u8 *buf, size_t len, struct asn1_oid *oid,
     62 		 const u8 **next);
     63 void asn1_oid_to_str(const struct asn1_oid *oid, char *buf, size_t len);
     64 unsigned long asn1_bit_string_to_long(const u8 *buf, size_t len);
     65 int asn1_oid_equal(const struct asn1_oid *a, const struct asn1_oid *b);
     66 
     67 extern struct asn1_oid asn1_sha1_oid;
     68 extern struct asn1_oid asn1_sha256_oid;
     69 
     70 #endif /* ASN1_H */
     71