crypto/asn1/evp_asn1.c

   1 /* crypto/asn1/evp_asn1.c */
   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 "cryptlib.h"
  61 #include <openssl/asn1.h>
  62 #include <openssl/asn1_mac.h>
  63
  64 int ASN1_TYPE_set_octetstring(ASN1_TYPE *a, unsigned char *data, int len)
  65 {
  66     ASN1_STRING *os;
  67
  68     if ((os = M_ASN1_OCTET_STRING_new()) == NULL)
  69         return (0);
  70     if (!M_ASN1_OCTET_STRING_set(os, data, len)) {
  71         M_ASN1_OCTET_STRING_free(os);
  72         return 0;
  73     }
  74     ASN1_TYPE_set(a, V_ASN1_OCTET_STRING, os);
  75     return (1);
  76 }
  77
  78 /* int max_len:  for returned value    */
  79 int ASN1_TYPE_get_octetstring(ASN1_TYPE *a, unsigned char *data, int max_len)
  80 {
  81     int ret, num;
  82     unsigned char *p;
  83
  84     if ((a->type != V_ASN1_OCTET_STRING) || (a->value.octet_string == NULL)) {
  85         ASN1err(ASN1_F_ASN1_TYPE_GET_OCTETSTRING, ASN1_R_DATA_IS_WRONG);
  86         return (-1);
  87     }
  88     p = M_ASN1_STRING_data(a->value.octet_string);
  89     ret = M_ASN1_STRING_length(a->value.octet_string);
  90     if (ret < max_len)
  91         num = ret;
  92     else
  93         num = max_len;
  94     memcpy(data, p, num);
  95     return (ret);
  96 }
  97
  98 int ASN1_TYPE_set_int_octetstring(ASN1_TYPE *a, long num, unsigned char *data,
  99                                   int len)
 100 {
 101     int n, size;
 102     ASN1_OCTET_STRING os, *osp;
 103     ASN1_INTEGER in;
 104     unsigned char *p;
 105     unsigned char buf[32];      /* when they have 256bit longs, I'll be in
 106                                  * trouble */
 107     in.data = buf;
 108     in.length = 32;
 109     os.data = data;
 110     os.type = V_ASN1_OCTET_STRING;
 111     os.length = len;
 112     ASN1_INTEGER_set(&in, num);
 113     n = i2d_ASN1_INTEGER(&in, NULL);
 114     n += M_i2d_ASN1_OCTET_STRING(&os, NULL);
 115
 116     size = ASN1_object_size(1, n, V_ASN1_SEQUENCE);
 117
 118     if ((osp = ASN1_STRING_new()) == NULL)
 119         return (0);
 120     /* Grow the 'string' */
 121     if (!ASN1_STRING_set(osp, NULL, size)) {
 122         ASN1_STRING_free(osp);
 123         return (0);
 124     }
 125
 126     M_ASN1_STRING_length_set(osp, size);
 127     p = M_ASN1_STRING_data(osp);
 128
 129     ASN1_put_object(&p, 1, n, V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL);
 130     i2d_ASN1_INTEGER(&in, &p);
 131     M_i2d_ASN1_OCTET_STRING(&os, &p);
 132
 133     ASN1_TYPE_set(a, V_ASN1_SEQUENCE, osp);
 134     return (1);
 135 }
 136
 137 /*
 138  * we return the actual length..., num may be missing, in which case, set it
 139  * to zero
 140  */
 141 /* int max_len:  for returned value    */
 142 int ASN1_TYPE_get_int_octetstring(ASN1_TYPE *a, long *num,
 143                                   unsigned char *data, int max_len)
 144 {
 145     int ret = -1, n;
 146     ASN1_INTEGER *ai = NULL;
 147     ASN1_OCTET_STRING *os = NULL;
 148     const unsigned char *p;
 149     long length;
 150     ASN1_const_CTX c;
 151
 152     if ((a->type != V_ASN1_SEQUENCE) || (a->value.sequence == NULL)) {
 153         goto err;
 154     }
 155     p = M_ASN1_STRING_data(a->value.sequence);
 156     length = M_ASN1_STRING_length(a->value.sequence);
 157
 158     c.pp = &p;
 159     c.p = p;
 160     c.max = p + length;
 161     c.error = ASN1_R_DATA_IS_WRONG;
 162
 163     M_ASN1_D2I_start_sequence();
 164     c.q = c.p;
 165     if ((ai = d2i_ASN1_INTEGER(NULL, &c.p, c.slen)) == NULL)
 166         goto err;
 167     c.slen -= (c.p - c.q);
 168     c.q = c.p;
 169     if ((os = d2i_ASN1_OCTET_STRING(NULL, &c.p, c.slen)) == NULL)
 170         goto err;
 171     c.slen -= (c.p - c.q);
 172     if (!M_ASN1_D2I_end_sequence())
 173         goto err;
 174
 175     if (num != NULL)
 176         *num = ASN1_INTEGER_get(ai);
 177
 178     ret = M_ASN1_STRING_length(os);
 179     if (max_len > ret)
 180         n = ret;
 181     else
 182         n = max_len;
 183
 184     if (data != NULL)
 185         memcpy(data, M_ASN1_STRING_data(os), n);
 186     if (0) {
 187  err:
 188         ASN1err(ASN1_F_ASN1_TYPE_GET_INT_OCTETSTRING, ASN1_R_DATA_IS_WRONG);
 189     }
 190     if (os != NULL)
 191         M_ASN1_OCTET_STRING_free(os);
 192     if (ai != NULL)
 193         M_ASN1_INTEGER_free(ai);
 194     return (ret);
 195 }