release/src/router/nettle/asn1.h

   1 /* asn1.h
   2  *
   3  * Some very limited asn.1 support.
   4  */
   5
   6 /* nettle, low-level cryptographics library
   7  *
   8  * Copyright (C) 2005 Niels Möller
   9  *
  10  * The nettle library is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * The nettle library is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  18  * License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  23  * MA 02111-1301, USA.
  24  */
  25
  26 #ifndef NETTLE_ASN1_H_INCLUDED
  27 #define NETTLE_ASN1_H_INCLUDED
  28
  29 #include "nettle-types.h"
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 /* Name mangling */
  36 #define asn1_der_iterator_first nettle_asn1_der_iterator_first
  37 #define asn1_der_iterator_next nettle_asn1_der_iterator_next
  38 #define asn1_der_decode_constructed nettle_asn1_der_decode_constructed
  39 #define asn1_der_decode_constructed_last nettle_asn1_der_decode_constructed_last
  40 #define asn1_der_decode_bitstring nettle_asn1_der_decode_bitstring
  41 #define asn1_der_decode_bitstring_last nettle_asn1_der_decode_bitstring_last
  42 #define asn1_der_get_uint32 nettle_asn1_der_get_uint32
  43 #define asn1_der_get_bignum nettle_asn1_der_get_bignum
  44
  45
  46 /* enum asn1_type keeps the class number and the constructive in bits
  47    13-14, and the constructive flag in bit 12. The remaining 14 bits
  48    are the tag (although currently, only tags in the range 0-30 are
  49    supported). */
  50
  51 enum
  52   {
  53     ASN1_TYPE_CONSTRUCTED = 1 << 12,
  54
  55     ASN1_CLASS_UNIVERSAL = 0,
  56     ASN1_CLASS_APPLICATION = 1 << 13,
  57     ASN1_CLASS_CONTEXT_SPECIFIC = 2 << 13,
  58     ASN1_CLASS_PRIVATE = 3 << 13,
  59
  60     ASN1_CLASS_MASK = 3 << 13,
  61     ASN1_CLASS_SHIFT = 13,
  62   };
  63
  64 enum asn1_type
  65   {
  66     ASN1_BOOLEAN = 1,
  67     ASN1_INTEGER = 2,
  68     ASN1_BITSTRING = 3,
  69     ASN1_OCTETSTRING = 4,
  70     ASN1_NULL = 5,
  71     ASN1_IDENTIFIER = 6,
  72     ASN1_REAL = 9,
  73     ASN1_ENUMERATED = 10,
  74     ASN1_UTF8STRING = 12,
  75     ASN1_SEQUENCE = 16 | ASN1_TYPE_CONSTRUCTED,
  76     ASN1_SET = 17 | ASN1_TYPE_CONSTRUCTED,
  77     ASN1_PRINTABLESTRING = 19,
  78     ASN1_TELETEXSTRING = 20,
  79     ASN1_IA5STRING = 22,
  80     ASN1_UTC = 23,
  81     ASN1_UNIVERSALSTRING = 28,
  82     ASN1_BMPSTRING = 30,
  83   };
  84
  85 enum asn1_iterator_result
  86   {
  87     ASN1_ITERATOR_ERROR,
  88     ASN1_ITERATOR_PRIMITIVE,
  89     ASN1_ITERATOR_CONSTRUCTED,
  90     ASN1_ITERATOR_END,
  91   };
  92
  93 /* Parsing DER objects. */
  94 struct asn1_der_iterator
  95 {
  96   unsigned buffer_length;
  97   const uint8_t *buffer;
  98
  99   /* Next object to parse. */
 100   unsigned pos;
 101
 102   enum asn1_type type;
 103
 104   /* Pointer to the current object */
 105   unsigned length;
 106   const uint8_t *data;
 107 };
 108
 109 /* Initializes the iterator. */
 110 enum asn1_iterator_result
 111 asn1_der_iterator_first(struct asn1_der_iterator *iterator,
 112                         unsigned length, const uint8_t *input);
 113
 114 enum asn1_iterator_result
 115 asn1_der_iterator_next(struct asn1_der_iterator *iterator);
 116
 117 /* Starts parsing of a constructed object. */
 118 enum asn1_iterator_result
 119 asn1_der_decode_constructed(struct asn1_der_iterator *i,
 120                             struct asn1_der_iterator *contents);
 121
 122 /* For the common case that we have a sequence at the end of the
 123    object. Checks that the current object is the final one, and then
 124    reinitializes the iterator to parse its ontents. */
 125 enum asn1_iterator_result
 126 asn1_der_decode_constructed_last(struct asn1_der_iterator *i);
 127
 128 enum asn1_iterator_result
 129 asn1_der_decode_bitstring(struct asn1_der_iterator *i,
 130                           struct asn1_der_iterator *contents);
 131
 132 enum asn1_iterator_result
 133 asn1_der_decode_bitstring_last(struct asn1_der_iterator *i);
 134
 135 /* All these functions return 1 on success, 0 on failure */
 136 int
 137 asn1_der_get_uint32(struct asn1_der_iterator *i,
 138                     uint32_t *x);
 139
 140 #ifdef __cplusplus
 141 }
 142 #endif
 143
 144 #endif /* NETTLE_ASN1_H_INCLUDED */