1 /* 2 * ASN.1 DER parsing 3 * Copyright (c) 2006, Jouni Malinen <j@w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include <stdio.h> 16 #include <string.h> 17 #include <stdint.h> 18 19 #ifndef ASN1_H 20 #define ASN1_H 21 22 #define ASN1_TAG_EOC 0x00 /* not used with DER */ 23 #define ASN1_TAG_BOOLEAN 0x01 24 #define ASN1_TAG_INTEGER 0x02 25 #define ASN1_TAG_BITSTRING 0x03 26 #define ASN1_TAG_OCTETSTRING 0x04 27 #define ASN1_TAG_NULL 0x05 28 #define ASN1_TAG_OID 0x06 29 #define ASN1_TAG_OBJECT_DESCRIPTOR 0x07 /* not yet parsed */ 30 #define ASN1_TAG_EXTERNAL 0x08 /* not yet parsed */ 31 #define ASN1_TAG_REAL 0x09 /* not yet parsed */ 32 #define ASN1_TAG_ENUMERATED 0x0A /* not yet parsed */ 33 #define ASN1_TAG_UTF8STRING 0x0C /* not yet parsed */ 34 #define ANS1_TAG_RELATIVE_OID 0x0D 35 #define ASN1_TAG_SEQUENCE 0x10 /* shall be constructed */ 36 #define ASN1_TAG_SET 0x11 37 #define ASN1_TAG_NUMERICSTRING 0x12 /* not yet parsed */ 38 #define ASN1_TAG_PRINTABLESTRING 0x13 39 #define ASN1_TAG_TG1STRING 0x14 /* not yet parsed */ 40 #define ASN1_TAG_VIDEOTEXSTRING 0x15 /* not yet parsed */ 41 #define ASN1_TAG_IA5STRING 0x16 42 #define ASN1_TAG_UTCTIME 0x17 43 #define ASN1_TAG_GENERALIZEDTIME 0x18 /* not yet parsed */ 44 #define ASN1_TAG_GRAPHICSTRING 0x19 /* not yet parsed */ 45 #define ASN1_TAG_VISIBLESTRING 0x1A 46 #define ASN1_TAG_GENERALSTRING 0x1B /* not yet parsed */ 47 #define ASN1_TAG_UNIVERSALSTRING 0x1C /* not yet parsed */ 48 #define ASN1_TAG_BMPSTRING 0x1D /* not yet parsed */ 49 50 #define ASN1_CLASS_UNIVERSAL 0 51 #define ASN1_CLASS_APPLICATION 1 52 #define ASN1_CLASS_CONTEXT_SPECIFIC 2 53 #define ASN1_CLASS_PRIVATE 3 54 55 56 struct asn1_hdr { 57 const uint8_t *payload; 58 uint8_t identifier, class, constructed; 59 unsigned int tag, length; 60 }; 61 62 #define ASN1_MAX_OID_LEN 20 63 struct asn1_oid { 64 unsigned long oid[ASN1_MAX_OID_LEN]; 65 size_t len; 66 }; 67 68 69 int asn1_get_next(const uint8_t *buf, size_t len, struct asn1_hdr *hdr); 70 int asn1_parse_oid(const uint8_t *buf, size_t len, struct asn1_oid *oid); 71 int asn1_get_oid(const uint8_t *buf, size_t len, struct asn1_oid *oid, 72 const uint8_t **next); 73 void asn1_oid_to_str(struct asn1_oid *oid, char *buf, size_t len); 74 unsigned long asn1_bit_string_to_long(const uint8_t *buf, size_t len); 75 76 #endif /* ASN1_H */ 77