lib/krb5/salt-arcfour.c

   1 /*
   2  * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5_locl.h"
  35
  36 static krb5_error_code
  37 ARCFOUR_string_to_key(krb5_context context,
  38                       krb5_enctype enctype,
  39                       krb5_data password,
  40                       krb5_salt salt,
  41                       krb5_data opaque,
  42                       krb5_keyblock *key)
  43 {
  44     krb5_error_code ret;
  45     uint16_t *s = NULL;
  46     size_t len = 0, i;
  47     EVP_MD_CTX *m;
  48
  49     m = EVP_MD_CTX_create();
  50     if (m == NULL) {
  51         ret = krb5_enomem(context);
  52         goto out;
  53     }
  54
  55     EVP_DigestInit_ex(m, EVP_md4(), NULL);
  56
  57     ret = wind_utf8ucs2_length(password.data, &len);
  58     if (ret) {
  59         krb5_set_error_message (context, ret,
  60                                 N_("Password is not valid UTF-8", ""));
  61         goto out;
  62     }
  63
  64     s = malloc (len * sizeof(s[0]));
  65     if (len != 0 && s == NULL) {
  66         ret = krb5_enomem(context);
  67         goto out;
  68     }
  69
  70     ret = wind_utf8ucs2(password.data, s, &len);
  71     if (ret) {
  72         krb5_set_error_message (context, ret,
  73                                 N_("Password is not valid UTF-8", ""));
  74         goto out;
  75     }
  76
  77     /* LE encoding */
  78     for (i = 0; i < len; i++) {
  79         unsigned char p;
  80         p = (s[i] & 0xff);
  81         EVP_DigestUpdate (m, &p, 1);
  82         p = (s[i] >> 8) & 0xff;
  83         EVP_DigestUpdate (m, &p, 1);
  84     }
  85
  86     key->keytype = enctype;
  87     ret = krb5_data_alloc (&key->keyvalue, 16);
  88     if (ret) {
  89         krb5_enomem(context);
  90         goto out;
  91     }
  92     EVP_DigestFinal_ex (m, key->keyvalue.data, NULL);
  93
  94  out:
  95     EVP_MD_CTX_destroy(m);
  96     if (s)
  97         memset (s, 0, len);
  98     free (s);
  99     return ret;
 100 }
 101
 102 struct salt_type _krb5_arcfour_salt[] = {
 103     {
 104         KRB5_PW_SALT,
 105         "pw-salt",
 106         ARCFOUR_string_to_key
 107     },
 108     { 0, NULL, NULL }
 109 };