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 i, j, k, m, n, again, bufsize;
  99     unsigned char *s = NULL, *sp;
 100     unsigned char *bufp;
 101     int num = 0, slen = 0, first = 1;
 102
 103     bufsize = BIO_gets(bp, buf, size);
 104     for (;;) {
 105         if (bufsize < 1) {
 106             if (first)
 107                 break;
 108             else
 109                 goto err;
 110         }
 111         first = 0;
 112
 113         i = bufsize;
 114         if (buf[i - 1] == '\n')
 115             buf[--i] = '\0';
 116         if (i == 0)
 117             goto err;
 118         if (buf[i - 1] == '\r')
 119             buf[--i] = '\0';
 120         if (i == 0)
 121             goto err;
 122         again = (buf[i - 1] == '\\');
 123
 124         for (j = i - 1; j > 0; j--) {
 125 #ifndef CHARSET_EBCDIC
 126             if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||
 127                   ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
 128                   ((buf[j] >= 'A') && (buf[j] <= 'F'))))
 129 #else
 130             /*
 131              * This #ifdef is not strictly necessary, since the characters
 132              * A...F a...f 0...9 are contiguous (yes, even in EBCDIC - but
 133              * not the whole alphabet). Nevertheless, isxdigit() is faster.
 134              */
 135             if (!isxdigit(buf[j]))
 136 #endif
 137             {
 138                 i = j;
 139                 break;
 140             }
 141         }
 142         buf[i] = '\0';
 143         /*
 144          * We have now cleared all the crap off the end of the line
 145          */
 146         if (i < 2)
 147             goto err;
 148
 149         bufp = (unsigned char *)buf;
 150
 151         k = 0;
 152         i -= again;
 153         if (i % 2 != 0) {
 154             ASN1err(ASN1_F_A2I_ASN1_STRING, ASN1_R_ODD_NUMBER_OF_CHARS);
 155             return 0;
 156         }
 157         i /= 2;
 158         if (num + i > slen) {
 159             sp = OPENSSL_realloc(s, (unsigned int)num + i * 2);
 160             if (sp == NULL) {
 161                 ASN1err(ASN1_F_A2I_ASN1_STRING, ERR_R_MALLOC_FAILURE);
 162                 OPENSSL_free(s);
 163                 return 0;
 164             }
 165             s = sp;
 166             slen = num + i * 2;
 167         }
 168         for (j = 0; j < i; j++, k += 2) {
 169             for (n = 0; n < 2; n++) {
 170                 m = bufp[k + n];
 171                 if ((m >= '0') && (m <= '9'))
 172                     m -= '0';
 173                 else if ((m >= 'a') && (m <= 'f'))
 174                     m = m - 'a' + 10;
 175                 else if ((m >= 'A') && (m <= 'F'))
 176                     m = m - 'A' + 10;
 177                 else {
 178                     ASN1err(ASN1_F_A2I_ASN1_STRING,
 179                             ASN1_R_NON_HEX_CHARACTERS);
 180                     return 0;
 181                 }
 182                 s[num + j] <<= 4;
 183                 s[num + j] |= m;
 184             }
 185         }
 186         num += i;
 187         if (again)
 188             bufsize = BIO_gets(bp, buf, size);
 189         else
 190             break;
 191     }
 192     bs->length = num;
 193     bs->data = s;
 194     return 1;
 195
 196  err:
 197     ASN1err(ASN1_F_A2I_ASN1_STRING, ASN1_R_SHORT_LINE);
 198     return 0;
 199 }