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)
  71         return (0);
  72
  73     if (a->type & V_ASN1_NEG) {
  74         if (BIO_write(bp, "-", 1) != 1)
  75             goto err;
  76         n = 1;
  77     }
  78
  79     if (a->length == 0) {
  80         if (BIO_write(bp, "00", 2) != 2)
  81             goto err;
  82         n += 2;
  83     } else {
  84         for (i = 0; i < a->length; i++) {
  85             if ((i != 0) && (i % 35 == 0)) {
  86                 if (BIO_write(bp, "\\\n", 2) != 2)
  87                     goto err;
  88                 n += 2;
  89             }
  90             buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
  91             buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
  92             if (BIO_write(bp, buf, 2) != 2)
  93                 goto err;
  94             n += 2;
  95         }
  96     }
  97     return (n);
  98  err:
  99     return (-1);
 100 }
 101
 102 int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
 103 {
 104     int ret = 0;
 105     int i, j, k, m, n, again, bufsize;
 106     unsigned char *s = NULL, *sp;
 107     unsigned char *bufp;
 108     int num = 0, slen = 0, first = 1;
 109
 110     bs->type = V_ASN1_INTEGER;
 111
 112     bufsize = BIO_gets(bp, buf, size);
 113     for (;;) {
 114         if (bufsize < 1)
 115             goto err_sl;
 116         i = bufsize;
 117         if (buf[i - 1] == '\n')
 118             buf[--i] = '\0';
 119         if (i == 0)
 120             goto err_sl;
 121         if (buf[i - 1] == '\r')
 122             buf[--i] = '\0';
 123         if (i == 0)
 124             goto err_sl;
 125         again = (buf[i - 1] == '\\');
 126
 127         for (j = 0; j < i; j++) {
 128 #ifndef CHARSET_EBCDIC
 129             if (!(((buf[j] >= '0') && (buf[j] <= '9')) ||
 130                   ((buf[j] >= 'a') && (buf[j] <= 'f')) ||
 131                   ((buf[j] >= 'A') && (buf[j] <= 'F'))))
 132 #else
 133             /*
 134              * This #ifdef is not strictly necessary, since the characters
 135              * A...F a...f 0...9 are contiguous (yes, even in EBCDIC - but
 136              * not the whole alphabet). Nevertheless, isxdigit() is faster.
 137              */
 138             if (!isxdigit(buf[j]))
 139 #endif
 140             {
 141                 i = j;
 142                 break;
 143             }
 144         }
 145         buf[i] = '\0';
 146         /*
 147          * We have now cleared all the crap off the end of the line
 148          */
 149         if (i < 2)
 150             goto err_sl;
 151
 152         bufp = (unsigned char *)buf;
 153         if (first) {
 154             first = 0;
 155             if ((bufp[0] == '0') && (buf[1] == '0')) {
 156                 bufp += 2;
 157                 i -= 2;
 158             }
 159         }
 160         k = 0;
 161         i -= again;
 162         if (i % 2 != 0) {
 163             ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_ODD_NUMBER_OF_CHARS);
 164             goto err;
 165         }
 166         i /= 2;
 167         if (num + i > slen) {
 168             sp = OPENSSL_realloc_clean(s, slen, num + i * 2);
 169             if (sp == NULL) {
 170                 ASN1err(ASN1_F_A2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
 171                 if (s != NULL)
 172                     OPENSSL_free(s);
 173                 goto err;
 174             }
 175             s = sp;
 176             slen = num + i * 2;
 177         }
 178         for (j = 0; j < i; j++, k += 2) {
 179             for (n = 0; n < 2; n++) {
 180                 m = bufp[k + n];
 181                 if ((m >= '0') && (m <= '9'))
 182                     m -= '0';
 183                 else if ((m >= 'a') && (m <= 'f'))
 184                     m = m - 'a' + 10;
 185                 else if ((m >= 'A') && (m <= 'F'))
 186                     m = m - 'A' + 10;
 187                 else {
 188                     ASN1err(ASN1_F_A2I_ASN1_INTEGER,
 189                             ASN1_R_NON_HEX_CHARACTERS);
 190                     goto err;
 191                 }
 192                 s[num + j] <<= 4;
 193                 s[num + j] |= m;
 194             }
 195         }
 196         num += i;
 197         if (again)
 198             bufsize = BIO_gets(bp, buf, size);
 199         else
 200             break;
 201     }
 202     bs->length = num;
 203     bs->data = s;
 204     ret = 1;
 205  err:
 206     if (0) {
 207  err_sl:
 208         ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_SHORT_LINE);
 209     }
 210     return (ret);
 211 }