crypto/asn1/f_string.c

   1 /* crypto/asn1/f_string.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_STRING(BIO *bp, ASN1_STRING *a, int type)
  65 {
  66     int i, n = 0;
  67     static const char *h = "0123456789ABCDEF";
  68     char buf[2];
  69
  70     if (a == NULL)
  71         return (0);
  72
  73     if (a->length == 0) {
  74         if (BIO_write(bp, "0", 1) != 1)
  75             goto err;
  76         n = 1;
  77     } else {
  78         for (i = 0; i < a->length; i++) {
  79             if ((i != 0) && (i % 35 == 0)) {
  80                 if (BIO_write(bp, "\\\n", 2) != 2)
  81                     goto err;
  82                 n += 2;
  83             }
  84             buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
  85             buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
  86             if (BIO_write(bp, buf, 2) != 2)
  87                 goto err;
  88             n += 2;
  89         }
  90     }
  91     return (n);
  92  err:
  93     return (-1);
  94 }
  95
  96 int a2i_ASN1_STRING(BIO *bp, ASN1_STRING *bs, char *buf, int size)
  97 {
  98     int ret = 0;
  99     int i, j, k, m, n, again, bufsize;
 100     unsigned char *s = NULL, *sp;
 101     unsigned char *bufp;
 102     int num = 0, slen = 0, first = 1;
 103
 104     bufsize = BIO_gets(bp, buf, size);
 105     for (;;) {
 106         if (bufsize < 1) {
 107             if (first)
 108                 break;
 109             else
 110                 goto err_sl;
 111         }
 112         first = 0;
 113
 114         i = bufsize;
 115         if (buf[i - 1] == '\n')
 116             buf[--i] = '\0';
 117         if (i == 0)
 118             goto err_sl;
 119         if (buf[i - 1] == '\r')
 120             buf[--i] = '\0';
 121         if (i == 0)
 122             goto err_sl;
 123         again = (buf[i - 1] == '\\');
 124
 125         for (j = i - 1; j > 0; j--) {
 126 #ifndef CHARSET_EBCDIC
 127             if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||
 128                   ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
 129                   ((buf[j] >= 'A') && (buf[j] <= 'F'))))
 130 #else
 131             /*
 132              * This #ifdef is not strictly necessary, since the characters
 133              * A...F a...f 0...9 are contiguous (yes, even in EBCDIC - but
 134              * not the whole alphabet). Nevertheless, isxdigit() is faster.
 135              */
 136             if (!isxdigit(buf[j]))
 137 #endif
 138             {
 139                 i = j;
 140                 break;
 141             }
 142         }
 143         buf[i] = '\0';
 144         /*
 145          * We have now cleared all the crap off the end of the line
 146          */
 147         if (i < 2)
 148             goto err_sl;
 149
 150         bufp = (unsigned char *)buf;
 151
 152         k = 0;
 153         i -= again;
 154         if (i % 2 != 0) {
 155             ASN1err(ASN1_F_A2I_ASN1_STRING, ASN1_R_ODD_NUMBER_OF_CHARS);
 156             goto err;
 157         }
 158         i /= 2;
 159         if (num + i > slen) {
 160             if (s == NULL)
 161                 sp = (unsigned char *)OPENSSL_malloc((unsigned int)num +
 162                                                      i * 2);
 163             else
 164                 sp = (unsigned char *)OPENSSL_realloc(s,
 165                                                       (unsigned int)num +
 166                                                       i * 2);
 167             if (sp == NULL) {
 168                 ASN1err(ASN1_F_A2I_ASN1_STRING, ERR_R_MALLOC_FAILURE);
 169                 if (s != NULL)
 170                     OPENSSL_free(s);
 171                 goto err;
 172             }
 173             s = sp;
 174             slen = num + i * 2;
 175         }
 176         for (j = 0; j < i; j++, k += 2) {
 177             for (n = 0; n < 2; n++) {
 178                 m = bufp[k + n];
 179                 if ((m >= '0') && (m <= '9'))
 180                     m -= '0';
 181                 else if ((m >= 'a') && (m <= 'f'))
 182                     m = m - 'a' + 10;
 183                 else if ((m >= 'A') && (m <= 'F'))
 184                     m = m - 'A' + 10;
 185                 else {
 186                     ASN1err(ASN1_F_A2I_ASN1_STRING,
 187                             ASN1_R_NON_HEX_CHARACTERS);
 188                     goto err;
 189                 }
 190                 s[num + j] <<= 4;
 191                 s[num + j] |= m;
 192             }
 193         }
 194         num += i;
 195         if (again)
 196             bufsize = BIO_gets(bp, buf, size);
 197         else
 198             break;
 199     }
 200     bs->length = num;
 201     bs->data = s;
 202     ret = 1;
 203  err:
 204     if (0) {
 205  err_sl:
 206         ASN1err(ASN1_F_A2I_ASN1_STRING, ASN1_R_SHORT_LINE);
 207     }
 208     return (ret);
 209 }