130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
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/* Simple ASN.1 parser
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* Copyright (C) 2000-2004 Andreas Steffen, Zuercher Hochschule Winterthur
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* Copyright (C) 2006 Martin Will, Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#ifndef _ASN1_H
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#define _ASN1_H
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#include <stdarg.h>
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#include <gmp.h>
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#include <types.h>
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/* Defines some primitive ASN1 types */
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typedef enum {
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ASN1_EOC = 0x00,
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ASN1_BOOLEAN = 0x01,
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ASN1_INTEGER = 0x02,
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ASN1_BIT_STRING = 0x03,
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ASN1_OCTET_STRING = 0x04,
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ASN1_NULL = 0x05,
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ASN1_OID = 0x06,
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ASN1_ENUMERATED = 0x0A,
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ASN1_UTF8STRING = 0x0C,
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ASN1_NUMERICSTRING = 0x12,
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ASN1_PRINTABLESTRING = 0x13,
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ASN1_T61STRING = 0x14,
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ASN1_VIDEOTEXSTRING = 0x15,
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ASN1_IA5STRING = 0x16,
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ASN1_UTCTIME = 0x17,
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ASN1_GENERALIZEDTIME = 0x18,
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ASN1_GRAPHICSTRING = 0x19,
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ASN1_VISIBLESTRING = 0x1A,
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ASN1_GENERALSTRING = 0x1B,
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ASN1_UNIVERSALSTRING = 0x1C,
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ASN1_BMPSTRING = 0x1E,
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ASN1_CONSTRUCTED = 0x20,
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ASN1_SEQUENCE = 0x30,
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ASN1_SET = 0x31,
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ASN1_CONTEXT_S_0 = 0x80,
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ASN1_CONTEXT_S_1 = 0x81,
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ASN1_CONTEXT_S_2 = 0x82,
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ASN1_CONTEXT_S_3 = 0x83,
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ASN1_CONTEXT_S_4 = 0x84,
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ASN1_CONTEXT_S_5 = 0x85,
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ASN1_CONTEXT_S_6 = 0x86,
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ASN1_CONTEXT_S_7 = 0x87,
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ASN1_CONTEXT_S_8 = 0x88,
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ASN1_CONTEXT_C_0 = 0xA0,
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ASN1_CONTEXT_C_1 = 0xA1,
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ASN1_CONTEXT_C_2 = 0xA2,
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ASN1_CONTEXT_C_3 = 0xA3,
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ASN1_CONTEXT_C_4 = 0xA4,
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ASN1_CONTEXT_C_5 = 0xA5
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} asn1_t;
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/* Definition of ASN1 flags */
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#define ASN1_NONE 0x00
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#define ASN1_DEF 0x01
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#define ASN1_OPT 0x02
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#define ASN1_LOOP 0x04
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#define ASN1_END 0x08
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#define ASN1_OBJ 0x10
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#define ASN1_BODY 0x20
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#define ASN1_RAW 0x40
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#define ASN1_INVALID_LENGTH 0xffffffff
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/* definition of an ASN.1 object */
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typedef struct {
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u_int level;
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const u_char *name;
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asn1_t type;
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u_char flags;
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} asn1Object_t;
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#define ASN1_MAX_LEVEL 10
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typedef struct {
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bool implicit;
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u_int level0;
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u_int loopAddr[ASN1_MAX_LEVEL+1];
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chunk_t blobs[ASN1_MAX_LEVEL+2];
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} asn1_ctx_t;
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/* some common prefabricated ASN.1 constants */
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extern const chunk_t ASN1_INTEGER_0;
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extern const chunk_t ASN1_INTEGER_1;
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extern const chunk_t ASN1_INTEGER_2;
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/* some popular algorithmIdentifiers */
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extern const chunk_t ASN1_md5_id;
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extern const chunk_t ASN1_sha1_id;
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extern const chunk_t ASN1_rsaEncryption_id;
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extern const chunk_t ASN1_md5WithRSA_id;
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extern const chunk_t ASN1_sha1WithRSA_id;
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extern chunk_t asn1_algorithmIdentifier(int oid);
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extern int known_oid(chunk_t object);
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extern u_int asn1_length(chunk_t *blob);
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extern bool is_printablestring(chunk_t str);
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extern time_t asn1totime(const chunk_t *utctime, asn1_t type);
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extern void asn1_init(asn1_ctx_t *ctx, chunk_t blob, u_int level0, bool implicit);
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extern bool extract_object(asn1Object_t const *objects, u_int *objectID, chunk_t *object, u_int *level, asn1_ctx_t *ctx);
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extern bool parse_asn1_simple_object(chunk_t *object, asn1_t type, u_int level, const char* name);
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extern int parse_algorithmIdentifier(chunk_t blob, int level0, chunk_t *parameters);
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extern bool is_asn1(chunk_t blob);
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#endif /* _ASN1_H */
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