lib/libcrypto/asn1/evp_asn1.c

   1 /* $OpenBSD: evp_asn1.c,v 1.21 2018/04/25 11:48:21 tb Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <string.h>
  61
  62 #include <openssl/asn1.h>
  63 #include <openssl/asn1t.h>
  64 #include <openssl/err.h>
  65
  66 int
  67 ASN1_TYPE_set_octetstring(ASN1_TYPE *a, unsigned char *data, int len)
  68 {
  69         ASN1_STRING *os;
  70
  71         if ((os = ASN1_OCTET_STRING_new()) == NULL)
  72                 return (0);
  73         if (!ASN1_STRING_set(os, data, len)) {
  74                 ASN1_OCTET_STRING_free(os);
  75                 return (0);
  76         }
  77         ASN1_TYPE_set(a, V_ASN1_OCTET_STRING, os);
  78         return (1);
  79 }
  80
  81 int
  82 ASN1_TYPE_get_octetstring(const ASN1_TYPE *a, unsigned char *data, int max_len)
  83 {
  84         int ret, num;
  85         unsigned char *p;
  86
  87         if ((a->type != V_ASN1_OCTET_STRING) ||
  88             (a->value.octet_string == NULL)) {
  89                 ASN1error(ASN1_R_DATA_IS_WRONG);
  90                 return (-1);
  91         }
  92         p = ASN1_STRING_data(a->value.octet_string);
  93         ret = ASN1_STRING_length(a->value.octet_string);
  94         if (ret < max_len)
  95                 num = ret;
  96         else
  97                 num = max_len;
  98         memcpy(data, p, num);
  99         return (ret);
 100 }
 101
 102 typedef struct {
 103         ASN1_INTEGER *num;
 104         ASN1_OCTET_STRING *value;
 105 } ASN1_int_octetstring;
 106
 107 static const ASN1_TEMPLATE ASN1_INT_OCTETSTRING_seq_tt[] = {
 108         {
 109                 .offset = offsetof(ASN1_int_octetstring, num),
 110                 .field_name = "num",
 111                 .item = &ASN1_INTEGER_it,
 112         },
 113         {
 114                 .offset = offsetof(ASN1_int_octetstring, value),
 115                 .field_name = "value",
 116                 .item = &ASN1_OCTET_STRING_it,
 117         },
 118 };
 119
 120 const ASN1_ITEM ASN1_INT_OCTETSTRING_it = {
 121         .itype = ASN1_ITYPE_SEQUENCE,
 122         .utype = V_ASN1_SEQUENCE,
 123         .templates = ASN1_INT_OCTETSTRING_seq_tt,
 124         .tcount = sizeof(ASN1_INT_OCTETSTRING_seq_tt) / sizeof(ASN1_TEMPLATE),
 125         .size = sizeof(ASN1_int_octetstring),
 126         .sname = "ASN1_INT_OCTETSTRING",
 127 };
 128
 129 int
 130 ASN1_TYPE_set_int_octetstring(ASN1_TYPE *at, long num, unsigned char *data,
 131     int len)
 132 {
 133         ASN1_int_octetstring *ios;
 134         ASN1_STRING *sp = NULL;
 135         int ret = 0;
 136
 137         if ((ios = (ASN1_int_octetstring *)ASN1_item_new(
 138             &ASN1_INT_OCTETSTRING_it)) == NULL)
 139                 goto err;
 140         if ((ios->num = ASN1_INTEGER_new()) == NULL)
 141                 goto err;
 142         if (!ASN1_INTEGER_set(ios->num, num))
 143                 goto err;
 144         if ((ios->value = ASN1_OCTET_STRING_new()) == NULL)
 145                 goto err;
 146         if (!ASN1_OCTET_STRING_set(ios->value, data, len))
 147                 goto err;
 148
 149         if ((sp = ASN1_item_pack(ios, &ASN1_INT_OCTETSTRING_it, NULL)) == NULL)
 150                 goto err;
 151
 152         ASN1_TYPE_set(at, V_ASN1_SEQUENCE, sp);
 153         sp = NULL;
 154
 155         ret = 1;
 156
 157  err:
 158         ASN1_item_free((ASN1_VALUE *)ios, &ASN1_INT_OCTETSTRING_it);
 159         ASN1_STRING_free(sp);
 160
 161         return ret;
 162 }
 163
 164 int
 165 ASN1_TYPE_get_int_octetstring(const ASN1_TYPE *at, long *num, unsigned char *data,
 166     int max_len)
 167 {
 168         ASN1_STRING *sp = at->value.sequence;
 169         ASN1_int_octetstring *ios = NULL;
 170         int ret = -1;
 171         int len;
 172
 173         if (at->type != V_ASN1_SEQUENCE || sp == NULL)
 174                 goto err;
 175
 176         if ((ios = ASN1_item_unpack(sp, &ASN1_INT_OCTETSTRING_it)) == NULL)
 177                 goto err;
 178
 179         if (num != NULL)
 180                 *num = ASN1_INTEGER_get(ios->num);
 181         if (data != NULL) {
 182                 len = ASN1_STRING_length(ios->value);
 183                 if (len > max_len)
 184                         len = max_len;
 185                 memcpy(data, ASN1_STRING_data(ios->value), len);
 186         }
 187
 188         ret = ASN1_STRING_length(ios->value);
 189
 190  err:
 191         ASN1_item_free((ASN1_VALUE *)ios, &ASN1_INT_OCTETSTRING_it);
 192
 193         if (ret == -1)
 194                 ASN1error(ASN1_R_DATA_IS_WRONG);
 195
 196         return ret;
 197 }