release/src/router/openssl/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 "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         if (a->data != NULL)
  79             OPENSSL_free(a->data);
  80         if ((a->data =
  81              (unsigned char *)OPENSSL_malloc(sizeof(long) + 1)) != NULL)
  82             memset((char *)a->data, 0, sizeof(long) + 1);
  83     }
  84     if (a->data == NULL) {
  85         ASN1err(ASN1_F_ASN1_ENUMERATED_SET, ERR_R_MALLOC_FAILURE);
  86         return (0);
  87     }
  88     d = v;
  89     if (d < 0) {
  90         d = -d;
  91         a->type = V_ASN1_NEG_ENUMERATED;
  92     }
  93
  94     for (i = 0; i < sizeof(long); i++) {
  95         if (d == 0)
  96             break;
  97         buf[i] = (int)d & 0xff;
  98         d >>= 8;
  99     }
 100     j = 0;
 101     for (k = i - 1; k >= 0; k--)
 102         a->data[j++] = buf[k];
 103     a->length = j;
 104     return (1);
 105 }
 106
 107 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
 108 {
 109     int neg = 0, i;
 110     long r = 0;
 111
 112     if (a == NULL)
 113         return (0L);
 114     i = a->type;
 115     if (i == V_ASN1_NEG_ENUMERATED)
 116         neg = 1;
 117     else if (i != V_ASN1_ENUMERATED)
 118         return -1;
 119
 120     if (a->length > (int)sizeof(long)) {
 121         /* hmm... a bit ugly */
 122         return (0xffffffffL);
 123     }
 124     if (a->data == NULL)
 125         return 0;
 126
 127     for (i = 0; i < a->length; i++) {
 128         r <<= 8;
 129         r |= (unsigned char)a->data[i];
 130     }
 131     if (neg)
 132         r = -r;
 133     return (r);
 134 }
 135
 136 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
 137 {
 138     ASN1_ENUMERATED *ret;
 139     int len, j;
 140
 141     if (ai == NULL)
 142         ret = M_ASN1_ENUMERATED_new();
 143     else
 144         ret = ai;
 145     if (ret == NULL) {
 146         ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_NESTED_ASN1_ERROR);
 147         goto err;
 148     }
 149     if (BN_is_negative(bn))
 150         ret->type = V_ASN1_NEG_ENUMERATED;
 151     else
 152         ret->type = V_ASN1_ENUMERATED;
 153     j = BN_num_bits(bn);
 154     len = ((j == 0) ? 0 : ((j / 8) + 1));
 155     if (ret->length < len + 4) {
 156         unsigned char *new_data = OPENSSL_realloc(ret->data, len + 4);
 157         if (!new_data) {
 158             ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
 159             goto err;
 160         }
 161         ret->data = new_data;
 162     }
 163
 164     ret->length = BN_bn2bin(bn, ret->data);
 165     return (ret);
 166  err:
 167     if (ret != ai)
 168         M_ASN1_ENUMERATED_free(ret);
 169     return (NULL);
 170 }
 171
 172 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
 173 {
 174     BIGNUM *ret;
 175
 176     if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
 177         ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN, ASN1_R_BN_LIB);
 178     else if (ai->type == V_ASN1_NEG_ENUMERATED)
 179         BN_set_negative(ret, 1);
 180     return (ret);
 181 }