crypto/asn1/f_int.c

   1 /*
   2  * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "crypto/ctype.h"
  12 #include "internal/cryptlib.h"
  13 #include <openssl/buffer.h>
  14 #include <openssl/asn1.h>
  15
  16 int i2a_ASN1_INTEGER(BIO *bp, const ASN1_INTEGER *a)
  17 {
  18     int i, n = 0;
  19     static const char *h = "0123456789ABCDEF";
  20     char buf[2];
  21
  22     if (a == NULL)
  23         return 0;
  24
  25     if (a->type & V_ASN1_NEG) {
  26         if (BIO_write(bp, "-", 1) != 1)
  27             goto err;
  28         n = 1;
  29     }
  30
  31     if (a->length == 0) {
  32         if (BIO_write(bp, "00", 2) != 2)
  33             goto err;
  34         n += 2;
  35     } else {
  36         for (i = 0; i < a->length; i++) {
  37             if ((i != 0) && (i % 35 == 0)) {
  38                 if (BIO_write(bp, "\\\n", 2) != 2)
  39                     goto err;
  40                 n += 2;
  41             }
  42             buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
  43             buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
  44             if (BIO_write(bp, buf, 2) != 2)
  45                 goto err;
  46             n += 2;
  47         }
  48     }
  49     return n;
  50  err:
  51     return -1;
  52 }
  53
  54 int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
  55 {
  56     int i, j, k, m, n, again, bufsize;
  57     unsigned char *s = NULL, *sp;
  58     unsigned char *bufp;
  59     int num = 0, slen = 0, first = 1;
  60
  61     bs->type = V_ASN1_INTEGER;
  62
  63     bufsize = BIO_gets(bp, buf, size);
  64     for (;;) {
  65         if (bufsize < 1)
  66             goto err;
  67         i = bufsize;
  68         if (buf[i - 1] == '\n')
  69             buf[--i] = '\0';
  70         if (i == 0)
  71             goto err;
  72         if (buf[i - 1] == '\r')
  73             buf[--i] = '\0';
  74         if (i == 0)
  75             goto err;
  76         again = (buf[i - 1] == '\\');
  77
  78         for (j = 0; j < i; j++) {
  79             if (!ossl_isxdigit(buf[j]))
  80             {
  81                 i = j;
  82                 break;
  83             }
  84         }
  85         buf[i] = '\0';
  86         /*
  87          * We have now cleared all the crap off the end of the line
  88          */
  89         if (i < 2)
  90             goto err;
  91
  92         bufp = (unsigned char *)buf;
  93         if (first) {
  94             first = 0;
  95             if ((bufp[0] == '0') && (bufp[1] == '0')) {
  96                 bufp += 2;
  97                 i -= 2;
  98             }
  99         }
 100         k = 0;
 101         i -= again;
 102         if (i % 2 != 0) {
 103             ERR_raise(ERR_LIB_ASN1, ASN1_R_ODD_NUMBER_OF_CHARS);
 104             OPENSSL_free(s);
 105             return 0;
 106         }
 107         i /= 2;
 108         if (num + i > slen) {
 109             sp = OPENSSL_clear_realloc(s, slen, num + i * 2);
 110             if (sp == NULL) {
 111                 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
 112                 OPENSSL_free(s);
 113                 return 0;
 114             }
 115             s = sp;
 116             slen = num + i * 2;
 117         }
 118         for (j = 0; j < i; j++, k += 2) {
 119             for (n = 0; n < 2; n++) {
 120                 m = OPENSSL_hexchar2int(bufp[k + n]);
 121                 if (m < 0) {
 122                     ERR_raise(ERR_LIB_ASN1, ASN1_R_NON_HEX_CHARACTERS);
 123                     goto err;
 124                 }
 125                 s[num + j] <<= 4;
 126                 s[num + j] |= m;
 127             }
 128         }
 129         num += i;
 130         if (again)
 131             bufsize = BIO_gets(bp, buf, size);
 132         else
 133             break;
 134     }
 135     bs->length = num;
 136     bs->data = s;
 137     return 1;
 138  err:
 139     ERR_raise(ERR_LIB_ASN1, ASN1_R_SHORT_LINE);
 140     OPENSSL_free(s);
 141     return 0;
 142 }
 143
 144 int i2a_ASN1_ENUMERATED(BIO *bp, const ASN1_ENUMERATED *a)
 145 {
 146     return i2a_ASN1_INTEGER(bp, a);
 147 }
 148
 149 int a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)
 150 {
 151     int rv = a2i_ASN1_INTEGER(bp, bs, buf, size);
 152     if (rv == 1)
 153         bs->type = V_ASN1_INTEGER | (bs->type & V_ASN1_NEG);
 154     return rv;
 155 }