lib/libcrypto/asn1/f_string.c

   1 /* $OpenBSD: f_string.c,v 1.17 2017/01/29 17:49:22 beck Exp $ */
   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
  61 #include <openssl/asn1.h>
  62 #include <openssl/buffer.h>
  63 #include <openssl/err.h>
  64
  65 int
  66 i2a_ASN1_STRING(BIO *bp, ASN1_STRING *a, int type)
  67 {
  68         int i, n = 0;
  69         static const char h[] = "0123456789ABCDEF";
  70         char buf[2];
  71
  72         if (a == NULL)
  73                 return (0);
  74
  75         if (a->length == 0) {
  76                 if (BIO_write(bp, "0", 1) != 1)
  77                         goto err;
  78                 n = 1;
  79         } else {
  80                 for (i = 0; i < a->length; i++) {
  81                         if ((i != 0) && (i % 35 == 0)) {
  82                                 if (BIO_write(bp, "\\\n", 2) != 2)
  83                                         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)
  89                                 goto err;
  90                         n += 2;
  91                 }
  92         }
  93         return (n);
  94
  95 err:
  96         return (-1);
  97 }
  98
  99 int
 100 a2i_ASN1_STRING(BIO *bp, ASN1_STRING *bs, char *buf, int size)
 101 {
 102         int ret = 0;
 103         int i, j, k, m, n, again, bufsize;
 104         unsigned char *s = NULL, *sp;
 105         unsigned char *bufp;
 106         int first = 1;
 107         size_t num = 0, slen = 0;
 108
 109         bufsize = BIO_gets(bp, buf, size);
 110         for (;;) {
 111                 if (bufsize < 1) {
 112                         if (first)
 113                                 break;
 114                         else
 115                                 goto err_sl;
 116                 }
 117                 first = 0;
 118
 119                 i = bufsize;
 120                 if (buf[i-1] == '\n')
 121                         buf[--i] = '\0';
 122                 if (i == 0)
 123                         goto err_sl;
 124                 if (buf[i-1] == '\r')
 125                         buf[--i] = '\0';
 126                 if (i == 0)
 127                         goto err_sl;
 128                 again = (buf[i - 1] == '\\');
 129
 130                 for (j = i - 1; j > 0; j--) {
 131                         if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||
 132                             ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
 133                             ((buf[j] >= 'A') && (buf[j] <= 'F')))) {
 134                                 i = j;
 135                                 break;
 136                         }
 137                 }
 138                 buf[i] = '\0';
 139                 /* We have now cleared all the crap off the end of the
 140                  * line */
 141                 if (i < 2)
 142                         goto err_sl;
 143
 144                 bufp = (unsigned char *)buf;
 145
 146                 k = 0;
 147                 i -= again;
 148                 if (i % 2 != 0) {
 149                         ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS);
 150                         goto err;
 151                 }
 152                 i /= 2;
 153                 if (num + i > slen) {
 154                         sp = realloc(s, num + i);
 155                         if (sp == NULL) {
 156                                 ASN1error(ERR_R_MALLOC_FAILURE);
 157                                 goto err;
 158                         }
 159                         s = sp;
 160                         slen = num + i;
 161                 }
 162                 for (j = 0; j < i; j++, k += 2) {
 163                         for (n = 0; n < 2; n++) {
 164                                 m = bufp[k + n];
 165                                 if ((m >= '0') && (m <= '9'))
 166                                         m -= '0';
 167                                 else if ((m >= 'a') && (m <= 'f'))
 168                                         m = m - 'a' + 10;
 169                                 else if ((m >= 'A') && (m <= 'F'))
 170                                         m = m - 'A' + 10;
 171                                 else {
 172                                         ASN1error(ASN1_R_NON_HEX_CHARACTERS);
 173                                         goto err;
 174                                 }
 175                                 s[num + j] <<= 4;
 176                                 s[num + j] |= m;
 177                         }
 178                 }
 179                 num += i;
 180                 if (again)
 181                         bufsize = BIO_gets(bp, buf, size);
 182                 else
 183                         break;
 184         }
 185         bs->length = num;
 186         bs->data = s;
 187         return (1);
 188
 189 err_sl:
 190         ASN1error(ASN1_R_SHORT_LINE);
 191 err:
 192         free(s);
 193         return (ret);
 194 }