crypto/asn1/f_int.c

   1 /* crypto/asn1/f_int.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 int i2a_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *a)
  65         {
  66         int i,n=0;
  67         static const char *h="0123456789ABCDEF";
  68         char buf[2];
  69
  70         if (a == NULL) return(0);
  71
  72         if (a->length == 0)
  73                 {
  74                 if (BIO_write(bp,"00",2) != 2) goto err;
  75                 n=2;
  76                 }
  77         else
  78                 {
  79                 for (i=0; i<a->length; i++)
  80                         {
  81                         if ((i != 0) && (i%35 == 0))
  82                                 {
  83                                 if (BIO_write(bp,"\\\n",2) != 2) goto err;
  84                                 n+=2;
  85                                 }
  86                         buf[0]=h[((unsigned char)a->data[i]>>4)&0x0f];
  87                         buf[1]=h[((unsigned char)a->data[i]   )&0x0f];
  88                         if (BIO_write(bp,buf,2) != 2) goto err;
  89                         n+=2;
  90                         }
  91                 }
  92         return(n);
  93 err:
  94         return(-1);
  95         }
  96
  97 int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
  98         {
  99         int ret=0;
 100         int i,j,k,m,n,again,bufsize;
 101         unsigned char *s=NULL,*sp;
 102         unsigned char *bufp;
 103         int num=0,slen=0,first=1;
 104
 105         bs->type=V_ASN1_INTEGER;
 106
 107         bufsize=BIO_gets(bp,buf,size);
 108         for (;;)
 109                 {
 110                 if (bufsize < 1) goto err_sl;
 111                 i=bufsize;
 112                 if (buf[i-1] == '\n') buf[--i]='\0';
 113                 if (i == 0) goto err_sl;
 114                 if (buf[i-1] == '\r') buf[--i]='\0';
 115                 if (i == 0) goto err_sl;
 116                 again=(buf[i-1] == '\\');
 117
 118                 for (j=0; j<i; j++)
 119                         {
 120 #ifndef CHARSET_EBCDIC
 121                         if (!(  ((buf[j] >= '0') && (buf[j] <= '9')) ||
 122                                 ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
 123                                 ((buf[j] >= 'A') && (buf[j] <= 'F'))))
 124 #else
 125                         /* This #ifdef is not strictly necessary, since
 126                          * the characters A...F a...f 0...9 are contiguous
 127                          * (yes, even in EBCDIC - but not the whole alphabet).
 128                          * Nevertheless, isxdigit() is faster.
 129                          */
 130                         if (!isxdigit(buf[j]))
 131 #endif
 132                                 {
 133                                 i=j;
 134                                 break;
 135                                 }
 136                         }
 137                 buf[i]='\0';
 138                 /* We have now cleared all the crap off the end of the
 139                  * line */
 140                 if (i < 2) goto err_sl;
 141
 142                 bufp=(unsigned char *)buf;
 143                 if (first)
 144                         {
 145                         first=0;
 146                         if ((bufp[0] == '0') && (buf[1] == '0'))
 147                                 {
 148                                 bufp+=2;
 149                                 i-=2;
 150                                 }
 151                         }
 152                 k=0;
 153                 i-=again;
 154                 if (i%2 != 0)
 155                         {
 156                         ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_ODD_NUMBER_OF_CHARS);
 157                         goto err;
 158                         }
 159                 i/=2;
 160                 if (num+i > slen)
 161                         {
 162                         if (s == NULL)
 163                                 sp=(unsigned char *)OPENSSL_malloc(
 164                                         (unsigned int)num+i*2);
 165                         else
 166                                 sp=(unsigned char *)OPENSSL_realloc(s,
 167                                         (unsigned int)num+i*2);
 168                         if (sp == NULL)
 169                                 {
 170                                 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
 171                                 if (s != NULL) OPENSSL_free(s);
 172                                 goto err;
 173                                 }
 174                         s=sp;
 175                         slen=num+i*2;
 176                         }
 177                 for (j=0; j<i; j++,k+=2)
 178                         {
 179                         for (n=0; n<2; n++)
 180                                 {
 181                                 m=bufp[k+n];
 182                                 if ((m >= '0') && (m <= '9'))
 183                                         m-='0';
 184                                 else if ((m >= 'a') && (m <= 'f'))
 185                                         m=m-'a'+10;
 186                                 else if ((m >= 'A') && (m <= 'F'))
 187                                         m=m-'A'+10;
 188                                 else
 189                                         {
 190                                         ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_NON_HEX_CHARACTERS);
 191                                         goto err;
 192                                         }
 193                                 s[num+j]<<=4;
 194                                 s[num+j]|=m;
 195                                 }
 196                         }
 197                 num+=i;
 198                 if (again)
 199                         bufsize=BIO_gets(bp,buf,size);
 200                 else
 201                         break;
 202                 }
 203         bs->length=num;
 204         bs->data=s;
 205         ret=1;
 206 err:
 207         if (0)
 208                 {
 209 err_sl:
 210                 ASN1err(ASN1_F_A2I_ASN1_INTEGER,ASN1_R_SHORT_LINE);
 211                 }
 212         return(ret);
 213         }
 214