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/* asn1.h
*
* Some very limited asn.1 support.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2005 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#ifndef NETTLE_ASN1_H_INCLUDED
#define NETTLE_ASN1_H_INCLUDED
#include "nettle-types.h"
/* Name mangling */
#define asn1_der_iterator_first nettle_asn1_der_iterator_first
#define asn1_der_iterator_next nettle_asn1_der_iterator_next
#define asn1_der_decode_constructed nettle_asn1_der_decode_constructed
#define asn1_der_decode_constructed_last nettle_asn1_der_decode_constructed_last
#define asn1_der_decode_bitstring nettle_asn1_der_decode_bitstring
#define asn1_der_decode_bitstring_last nettle_asn1_der_decode_bitstring_last
#define asn1_der_get_uint32 nettle_asn1_der_get_uint32
#define asn1_der_get_bignum nettle_asn1_der_get_bignum
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/* enum asn1_type keeps the class number and the constructive in bits
13-14, and the constructive flag in bit 12. The remaining 14 bits
are the tag (although currently, only tags in the range 0-30 are
supported). */
enum
{
ASN1_TYPE_CONSTRUCTED = 1 << 12,
ASN1_CLASS_UNIVERSAL = 0,
ASN1_CLASS_APPLICATION = 1 << 13,
ASN1_CLASS_CONTEXT_SPECIFIC = 2 << 13,
ASN1_CLASS_PRIVATE = 3 << 13,
ASN1_CLASS_MASK = 3 << 13,
ASN1_CLASS_SHIFT = 13,
};
enum asn1_type
{
ASN1_BOOLEAN = 1,
ASN1_INTEGER = 2,
ASN1_BITSTRING = 3,
ASN1_OCTETSTRING = 4,
ASN1_NULL = 5,
ASN1_IDENTIFIER = 6,
ASN1_REAL = 9,
ASN1_ENUMERATED = 10,
ASN1_UTF8STRING = 12,
ASN1_SEQUENCE = 16 | ASN1_TYPE_CONSTRUCTED,
ASN1_SET = 17 | ASN1_TYPE_CONSTRUCTED,
ASN1_PRINTABLESTRING = 19,
ASN1_TELETEXSTRING = 20,
ASN1_IA5STRING = 22,
ASN1_UTC = 23,
ASN1_UNIVERSALSTRING = 28,
ASN1_BMPSTRING = 30,
};
enum asn1_iterator_result
{
ASN1_ITERATOR_ERROR,
ASN1_ITERATOR_PRIMITIVE,
ASN1_ITERATOR_CONSTRUCTED,
ASN1_ITERATOR_END,
};
/* Parsing DER objects. */
struct asn1_der_iterator
{
unsigned buffer_length;
const uint8_t *buffer;
/* Next object to parse. */
unsigned pos;
enum asn1_type type;
/* Pointer to the current object */
unsigned length;
const uint8_t *data;
};
/* Initializes the iterator. */
enum asn1_iterator_result
asn1_der_iterator_first(struct asn1_der_iterator *iterator,
unsigned length, const uint8_t *input);
enum asn1_iterator_result
asn1_der_iterator_next(struct asn1_der_iterator *iterator);
/* Starts parsing of a constructed object. */
enum asn1_iterator_result
asn1_der_decode_constructed(struct asn1_der_iterator *i,
struct asn1_der_iterator *contents);
/* For the common case that we have a sequence at the end of the
object. Checks that the current object is the final one, and ten
reinitialize the iterator to parse its ontents. */
enum asn1_iterator_result
asn1_der_decode_constructed_last(struct asn1_der_iterator *i);
enum asn1_iterator_result
asn1_der_decode_bitstring(struct asn1_der_iterator *i,
struct asn1_der_iterator *contents);
enum asn1_iterator_result
asn1_der_decode_bitstring_last(struct asn1_der_iterator *i);
/* All these functions return 1 on success, 0 on failure */
int
asn1_der_get_uint32(struct asn1_der_iterator *i,
uint32_t *x);