crypto/external/bsd/heimdal/dist/lib/krb5/generate_subkey.c

   1 /*      $NetBSD: generate_subkey.c,v 1.1.1.1 2011/04/13 18:15:33 elric Exp $    */
   2
   3 /*
   4  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "krb5_locl.h"
  37
  38 /**
  39  * Generate subkey, from keyblock
  40  *
  41  * @param context kerberos context
  42  * @param key session key
  43  * @param etype encryption type of subkey, if ETYPE_NULL, use key's enctype
  44  * @param subkey returned new, free with krb5_free_keyblock().
  45  *
  46  * @return 0 on success or a Kerberos 5 error code
  47  *
  48 * @ingroup krb5_crypto
  49  */
  50
  51 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  52 krb5_generate_subkey_extended(krb5_context context,
  53                               const krb5_keyblock *key,
  54                               krb5_enctype etype,
  55                               krb5_keyblock **subkey)
  56 {
  57     krb5_error_code ret;
  58
  59     ALLOC(*subkey, 1);
  60     if (*subkey == NULL) {
  61         krb5_set_error_message(context, ENOMEM,N_("malloc: out of memory", ""));
  62         return ENOMEM;
  63     }
  64
  65     if (etype == ETYPE_NULL)
  66         etype = key->keytype; /* use session key etype */
  67
  68     /* XXX should we use the session key as input to the RF? */
  69     ret = krb5_generate_random_keyblock(context, etype, *subkey);
  70     if (ret != 0) {
  71         free(*subkey);
  72         *subkey = NULL;
  73     }
  74
  75     return ret;
  76 }
  77