crypto/asn1/f_int.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include "internal/cryptlib.h"
  60 #include <openssl/buffer.h>
  61 #include <openssl/asn1.h>
  62
  63 int i2a_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *a)
  64 {
  65     int i, n = 0;
  66     static const char *h = "0123456789ABCDEF";
  67     char buf[2];
  68
  69     if (a == NULL)
  70         return (0);
  71
  72     if (a->type & V_ASN1_NEG) {
  73         if (BIO_write(bp, "-", 1) != 1)
  74             goto err;
  75         n = 1;
  76     }
  77
  78     if (a->length == 0) {
  79         if (BIO_write(bp, "00", 2) != 2)
  80             goto err;
  81         n += 2;
  82     } else {
  83         for (i = 0; i < a->length; i++) {
  84             if ((i != 0) && (i % 35 == 0)) {
  85                 if (BIO_write(bp, "\\\n", 2) != 2)
  86                     goto err;
  87                 n += 2;
  88             }
  89             buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
  90             buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
  91             if (BIO_write(bp, buf, 2) != 2)
  92                 goto err;
  93             n += 2;
  94         }
  95     }
  96     return (n);
  97  err:
  98     return (-1);
  99 }
 100
 101 int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
 102 {
 103     int i, j, k, m, n, again, bufsize;
 104     unsigned char *s = NULL, *sp;
 105     unsigned char *bufp;
 106     int num = 0, slen = 0, first = 1;
 107
 108     bs->type = V_ASN1_INTEGER;
 109
 110     bufsize = BIO_gets(bp, buf, size);
 111     for (;;) {
 112         if (bufsize < 1)
 113             goto err;
 114         i = bufsize;
 115         if (buf[i - 1] == '\n')
 116             buf[--i] = '\0';
 117         if (i == 0)
 118             goto err;
 119         if (buf[i - 1] == '\r')
 120             buf[--i] = '\0';
 121         if (i == 0)
 122             goto err;
 123         again = (buf[i - 1] == '\\');
 124
 125         for (j = 0; j < i; 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;
 149
 150         bufp = (unsigned char *)buf;
 151         if (first) {
 152             first = 0;
 153             if ((bufp[0] == '0') && (buf[1] == '0')) {
 154                 bufp += 2;
 155                 i -= 2;
 156             }
 157         }
 158         k = 0;
 159         i -= again;
 160         if (i % 2 != 0) {
 161             ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_ODD_NUMBER_OF_CHARS);
 162             return 0;
 163         }
 164         i /= 2;
 165         if (num + i > slen) {
 166             sp = OPENSSL_clear_realloc(s, slen, num + i * 2);
 167             if (sp == NULL) {
 168                 ASN1err(ASN1_F_A2I_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
 169                 OPENSSL_free(s);
 170                 return 0;
 171             }
 172             s = sp;
 173             slen = num + i * 2;
 174         }
 175         for (j = 0; j < i; j++, k += 2) {
 176             for (n = 0; n < 2; n++) {
 177                 m = bufp[k + n];
 178                 if ((m >= '0') && (m <= '9'))
 179                     m -= '0';
 180                 else if ((m >= 'a') && (m <= 'f'))
 181                     m = m - 'a' + 10;
 182                 else if ((m >= 'A') && (m <= 'F'))
 183                     m = m - 'A' + 10;
 184                 else {
 185                     ASN1err(ASN1_F_A2I_ASN1_INTEGER,
 186                             ASN1_R_NON_HEX_CHARACTERS);
 187                     goto err;
 188                 }
 189                 s[num + j] <<= 4;
 190                 s[num + j] |= m;
 191             }
 192         }
 193         num += i;
 194         if (again)
 195             bufsize = BIO_gets(bp, buf, size);
 196         else
 197             break;
 198     }
 199     bs->length = num;
 200     bs->data = s;
 201     return 1;
 202  err:
 203     ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_SHORT_LINE);
 204     return 0;
 205 }
 206
 207 int i2a_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *a)
 208 {
 209     return i2a_ASN1_INTEGER(bp, a);
 210 }
 211
 212 int a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)
 213 {
 214     int rv = a2i_ASN1_INTEGER(bp, bs, buf, size);
 215     if (rv == 1)
 216         bs->type = V_ASN1_INTEGER | (bs->type & V_ASN1_NEG);
 217     return rv;
 218 }