lib/libcrypto/asn1/f_int.c

   1 /* $OpenBSD: f_int.c,v 1.18 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_INTEGER(BIO *bp, ASN1_INTEGER *a)
  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->type & V_ASN1_NEG) {
  76                 if (BIO_write(bp, "-", 1) != 1)
  77                         goto err;
  78                 n = 1;
  79         }
  80
  81         if (a->length == 0) {
  82                 if (BIO_write(bp, "00", 2) != 2)
  83                         goto err;
  84                 n += 2;
  85         } else {
  86                 for (i = 0; i < a->length; i++) {
  87                         if ((i != 0) && (i % 35 == 0)) {
  88                                 if (BIO_write(bp, "\\\n", 2) != 2)
  89                                         goto err;
  90                                 n += 2;
  91                         }
  92                         buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
  93                         buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
  94                         if (BIO_write(bp, buf, 2) != 2)
  95                                 goto err;
  96                         n += 2;
  97                 }
  98         }
  99         return (n);
 100
 101 err:
 102         return (-1);
 103 }
 104
 105 int
 106 a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
 107 {
 108         int ret = 0;
 109         int i, j,k, m,n, again, bufsize;
 110         unsigned char *s = NULL, *sp;
 111         unsigned char *bufp;
 112         int num = 0, slen = 0, first = 1;
 113
 114         bs->type = V_ASN1_INTEGER;
 115
 116         bufsize = BIO_gets(bp, buf, size);
 117         for (;;) {
 118                 if (bufsize < 1)
 119                         goto err_sl;
 120                 i = bufsize;
 121                 if (buf[i - 1] == '\n')
 122                         buf[--i] = '\0';
 123                 if (i == 0)
 124                         goto err_sl;
 125                 if (buf[i - 1] == '\r')
 126                         buf[--i] = '\0';
 127                 if (i == 0)
 128                         goto err_sl;
 129                 again = (buf[i - 1] == '\\');
 130
 131                 for (j = 0; j < i; j++) {
 132                         if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||
 133                             ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
 134                             ((buf[j] >= 'A') && (buf[j] <= 'F')))) {
 135                                 i = j;
 136                                 break;
 137                         }
 138                 }
 139                 buf[i] = '\0';
 140                 /* We have now cleared all the crap off the end of the
 141                  * line */
 142                 if (i < 2)
 143                         goto err_sl;
 144
 145                 bufp = (unsigned char *)buf;
 146                 if (first) {
 147                         first = 0;
 148                         if ((bufp[0] == '0') && (buf[1] == '0')) {
 149                                 bufp += 2;
 150                                 i -= 2;
 151                         }
 152                 }
 153                 k = 0;
 154                 i -= again;
 155                 if (i % 2 != 0) {
 156                         ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS);
 157                         goto err;
 158                 }
 159                 i /= 2;
 160                 if (num + i > slen) {
 161                         sp = OPENSSL_realloc_clean(s, slen, num + i);
 162                         if (sp == NULL) {
 163                                 ASN1error(ERR_R_MALLOC_FAILURE);
 164                                 goto err;
 165                         }
 166                         s = sp;
 167                         slen = num + i;
 168                 }
 169                 for (j = 0; j < i; j++, k += 2) {
 170                         for (n = 0; n < 2; n++) {
 171                                 m = bufp[k + n];
 172                                 if ((m >= '0') && (m <= '9'))
 173                                         m -= '0';
 174                                 else if ((m >= 'a') && (m <= 'f'))
 175                                         m = m - 'a' + 10;
 176                                 else if ((m >= 'A') && (m <= 'F'))
 177                                         m = m - 'A' + 10;
 178                                 else {
 179                                         ASN1error(ASN1_R_NON_HEX_CHARACTERS);
 180                                         goto err;
 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_sl:
 197         ASN1error(ASN1_R_SHORT_LINE);
 198 err:
 199         free(s);
 200         return (ret);
 201 }