crypto/asn1/a_enum.c

   1 /* crypto/asn1/a_enum.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 "internal/cryptlib.h"
  61 #include <openssl/asn1.h>
  62 #include <openssl/bn.h>
  63
  64 /*
  65  * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
  66  * for comments on encoding see a_int.c
  67  */
  68
  69 int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
  70 {
  71     int j, k;
  72     unsigned int i;
  73     unsigned char buf[sizeof(long) + 1];
  74     long d;
  75
  76     a->type = V_ASN1_ENUMERATED;
  77     if (a->length < (int)(sizeof(long) + 1)) {
  78         OPENSSL_free(a->data);
  79         if ((a->data = OPENSSL_malloc(sizeof(long) + 1)) != NULL)
  80             memset(a->data, 0, sizeof(long) + 1);
  81     }
  82     if (a->data == NULL) {
  83         ASN1err(ASN1_F_ASN1_ENUMERATED_SET, ERR_R_MALLOC_FAILURE);
  84         return (0);
  85     }
  86     d = v;
  87     if (d < 0) {
  88         d = -d;
  89         a->type = V_ASN1_NEG_ENUMERATED;
  90     }
  91
  92     for (i = 0; i < sizeof(long); i++) {
  93         if (d == 0)
  94             break;
  95         buf[i] = (int)d & 0xff;
  96         d >>= 8;
  97     }
  98     j = 0;
  99     for (k = i - 1; k >= 0; k--)
 100         a->data[j++] = buf[k];
 101     a->length = j;
 102     return (1);
 103 }
 104
 105 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
 106 {
 107     int neg = 0, i;
 108     long r = 0;
 109
 110     if (a == NULL)
 111         return (0L);
 112     i = a->type;
 113     if (i == V_ASN1_NEG_ENUMERATED)
 114         neg = 1;
 115     else if (i != V_ASN1_ENUMERATED)
 116         return -1;
 117
 118     if (a->length > (int)sizeof(long)) {
 119         /* hmm... a bit ugly */
 120         return (0xffffffffL);
 121     }
 122     if (a->data == NULL)
 123         return 0;
 124
 125     for (i = 0; i < a->length; i++) {
 126         r <<= 8;
 127         r |= (unsigned char)a->data[i];
 128     }
 129     if (neg)
 130         r = -r;
 131     return (r);
 132 }
 133
 134 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
 135 {
 136     ASN1_ENUMERATED *ret;
 137     int len, j;
 138
 139     if (ai == NULL)
 140         ret = ASN1_ENUMERATED_new();
 141     else
 142         ret = ai;
 143     if (ret == NULL) {
 144         ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_NESTED_ASN1_ERROR);
 145         goto err;
 146     }
 147     if (BN_is_negative(bn))
 148         ret->type = V_ASN1_NEG_ENUMERATED;
 149     else
 150         ret->type = V_ASN1_ENUMERATED;
 151     j = BN_num_bits(bn);
 152     len = ((j == 0) ? 0 : ((j / 8) + 1));
 153     if (ret->length < len + 4) {
 154         unsigned char *new_data = OPENSSL_realloc(ret->data, len + 4);
 155         if (!new_data) {
 156             ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
 157             goto err;
 158         }
 159         ret->data = new_data;
 160     }
 161
 162     ret->length = BN_bn2bin(bn, ret->data);
 163     return (ret);
 164  err:
 165     if (ret != ai)
 166         ASN1_ENUMERATED_free(ret);
 167     return (NULL);
 168 }
 169
 170 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
 171 {
 172     BIGNUM *ret;
 173
 174     if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
 175         ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN, ASN1_R_BN_LIB);
 176     else if (ai->type == V_ASN1_NEG_ENUMERATED)
 177         BN_set_negative(ret, 1);
 178     return (ret);
 179 }