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                 {
  79                 if (a->data != NULL)
  80                         OPENSSL_free(a->data);
  81                 if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL)
  82                         memset((char *)a->data,0,sizeof(long)+1);
  83                 }
  84         if (a->data == NULL)
  85                 {
  86                 ASN1err(ASN1_F_ASN1_ENUMERATED_SET,ERR_R_MALLOC_FAILURE);
  87                 return(0);
  88                 }
  89         d=v;
  90         if (d < 0)
  91                 {
  92                 d= -d;
  93                 a->type=V_ASN1_NEG_ENUMERATED;
  94                 }
  95 
  96         for (i=0; i<sizeof(long); i++)
  97                 {
  98                 if (d == 0) break;
  99                 buf[i]=(int)d&0xff;
 100                 d>>=8;
 101                 }
 102         j=0;
 103         for (k=i-1; k >=0; k--)
 104                 a->data[j++]=buf[k];
 105         a->length=j;
 106         return(1);
 107         }
 108 
 109 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
 110         {
 111         int neg=0,i;
 112         long r=0;
 113 
 114         if (a == NULL) return(0L);
 115         i=a->type;
 116         if (i == V_ASN1_NEG_ENUMERATED)
 117                 neg=1;
 118         else if (i != V_ASN1_ENUMERATED)
 119                 return -1;
 120         
 121         if (a->length > (int)sizeof(long))
 122                 {
 123                 /* hmm... a bit ugly */
 124                 return(0xffffffffL);
 125                 }
 126         if (a->data == NULL)
 127                 return 0;
 128 
 129         for (i=0; i<a->length; i++)
 130                 {
 131                 r<<=8;
 132                 r|=(unsigned char)a->data[i];
 133                 }
 134         if (neg) r= -r;
 135         return(r);
 136         }
 137 
 138 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
 139         {
 140         ASN1_ENUMERATED *ret;
 141         int len,j;
 142 
 143         if (ai == NULL)
 144                 ret=M_ASN1_ENUMERATED_new();
 145         else
 146                 ret=ai;
 147         if (ret == NULL)
 148                 {
 149                 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_NESTED_ASN1_ERROR);
 150                 goto err;
 151                 }
 152         if(BN_is_negative(bn)) ret->type = V_ASN1_NEG_ENUMERATED;
 153         else ret->type=V_ASN1_ENUMERATED;
 154         j=BN_num_bits(bn);
 155         len=((j == 0)?0:((j/8)+1));
 156         if (ret->length < len+4)
 157                 {
 158                 unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);
 159                 if (!new_data)
 160                         {
 161                         ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE);
 162                         goto err;
 163                         }
 164                 ret->data=new_data;
 165                 }
 166 
 167         ret->length=BN_bn2bin(bn,ret->data);
 168         return(ret);
 169 err:
 170         if (ret != ai) M_ASN1_ENUMERATED_free(ret);
 171         return(NULL);
 172         }
 173 
 174 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
 175         {
 176         BIGNUM *ret;
 177 
 178         if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
 179                 ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN,ASN1_R_BN_LIB);
 180         else if(ai->type == V_ASN1_NEG_ENUMERATED) BN_set_negative(ret,1);
 181         return(ret);
 182         }