1 /* crypto/asn1/f_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/buffer.h>
  62 #include <openssl/asn1.h>
  63 
  64 /* Based on a_int.c: equivalent ENUMERATED functions */
  65 
  66 int i2a_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *a)
  67         {
  68         int i,n=0;
  69         static const char *h="0123456789ABCDEF";
  70         char buf[2];
  71 
  72         if (a == NULL) return(0);
  73 
  74         if (a->length == 0)
  75                 {
  76                 if (BIO_write(bp,"00",2) != 2) goto err;
  77                 n=2;
  78                 }
  79         else
  80                 {
  81                 for (i=0; i<a->length; i++)
  82                         {
  83                         if ((i != 0) && (i%35 == 0))
  84                                 {
  85                                 if (BIO_write(bp,"\\\n",2) != 2) goto err;
  86                                 n+=2;
  87                                 }
  88                         buf[0]=h[((unsigned char)a->data[i]>>4)&0x0f];
  89                         buf[1]=h[((unsigned char)a->data[i]   )&0x0f];
  90                         if (BIO_write(bp,buf,2) != 2) goto err;
  91                         n+=2;
  92                         }
  93                 }
  94         return(n);
  95 err:
  96         return(-1);
  97         }
  98 
  99 int a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)
 100         {
 101         int ret=0;
 102         int i,j,k,m,n,again,bufsize;
 103         unsigned char *s=NULL,*sp;
 104         unsigned char *bufp;
 105         int num=0,slen=0,first=1;
 106 
 107         bs->type=V_ASN1_ENUMERATED;
 108 
 109         bufsize=BIO_gets(bp,buf,size);
 110         for (;;)
 111                 {
 112                 if (bufsize < 1) goto err_sl;
 113                 i=bufsize;
 114                 if (buf[i-1] == '\n') buf[--i]='\0';
 115                 if (i == 0) goto err_sl;
 116                 if (buf[i-1] == '\r') buf[--i]='\0';
 117                 if (i == 0) goto err_sl;
 118                 again=(buf[i-1] == '\\');
 119 
 120                 for (j=0; j<i; j++)
 121                         {
 122                         if (!(  ((buf[j] >= '0') && (buf[j] <= '9')) ||
 123                                 ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
 124                                 ((buf[j] >= 'A') && (buf[j] <= 'F'))))
 125                                 {
 126                                 i=j;
 127                                 break;
 128                                 }
 129                         }
 130                 buf[i]='\0';
 131                 /* We have now cleared all the crap off the end of the
 132                  * line */
 133                 if (i < 2) goto err_sl;
 134 
 135                 bufp=(unsigned char *)buf;
 136                 if (first)
 137                         {
 138                         first=0;
 139                         if ((bufp[0] == '0') && (buf[1] == '0'))
 140                                 {
 141                                 bufp+=2;
 142                                 i-=2;
 143                                 }
 144                         }
 145                 k=0;
 146                 i-=again;
 147                 if (i%2 != 0)
 148                         {
 149                         ASN1err(ASN1_F_A2I_ASN1_ENUMERATED,ASN1_R_ODD_NUMBER_OF_CHARS);
 150                         goto err;
 151                         }
 152                 i/=2;
 153                 if (num+i > slen)
 154                         {
 155                         if (s == NULL)
 156                                 sp=(unsigned char *)OPENSSL_malloc(
 157                                         (unsigned int)num+i*2);
 158                         else
 159                                 sp=(unsigned char *)OPENSSL_realloc(s,
 160                                         (unsigned int)num+i*2);
 161                         if (sp == NULL)
 162                                 {
 163                                 ASN1err(ASN1_F_A2I_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE);
 164                                 if (s != NULL) OPENSSL_free(s);
 165                                 goto err;
 166                                 }
 167                         s=sp;
 168                         slen=num+i*2;
 169                         }
 170                 for (j=0; j<i; j++,k+=2)
 171                         {
 172                         for (n=0; n<2; n++)
 173                                 {
 174                                 m=bufp[k+n];
 175                                 if ((m >= '0') && (m <= '9'))
 176                                         m-='0';
 177                                 else if ((m >= 'a') && (m <= 'f'))
 178                                         m=m-'a'+10;
 179                                 else if ((m >= 'A') && (m <= 'F'))
 180                                         m=m-'A'+10;
 181                                 else
 182                                         {
 183                                         ASN1err(ASN1_F_A2I_ASN1_ENUMERATED,ASN1_R_NON_HEX_CHARACTERS);
 184                                         goto err;
 185                                         }
 186                                 s[num+j]<<=4;
 187                                 s[num+j]|=m;
 188                                 }
 189                         }
 190                 num+=i;
 191                 if (again)
 192                         bufsize=BIO_gets(bp,buf,size);
 193                 else
 194                         break;
 195                 }
 196         bs->length=num;
 197         bs->data=s;
 198         ret=1;
 199 err:
 200         if (0)
 201                 {
 202 err_sl:
 203                 ASN1err(ASN1_F_A2I_ASN1_ENUMERATED,ASN1_R_SHORT_LINE);
 204                 }
 205         return(ret);
 206         }
 207