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Member "openssl-1.0.2q/crypto/asn1/a_enum.c" (20 Nov 2018, 6100 Bytes) of package /linux/misc/openssl-1.0.2q.tar.gz:


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    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 }