File: asn1.h

package info (click to toggle)
nettle 1.15-5
  • links: PTS, VCS
  • area: main
  • in suites: lenny
  • size: 3,184 kB
  • ctags: 2,262
  • sloc: ansic: 18,917; sh: 3,259; asm: 1,217; makefile: 519; cpp: 77
file content (144 lines) | stat: -rw-r--r-- 4,099 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/* asn1.h
 *
 * Some very limited asn.1 support.
 */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 2005 Niels Mller
 *  
 * 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"

#ifdef __cplusplus
extern "C" {
#endif

/* 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


/* 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);

#ifdef __cplusplus
}
#endif

#endif /* NETTLE_ASN1_H_INCLUDED */