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