Line data    Source code

       1             : /*
       2             :  * Copyright (c) 1997 - 2001 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             : /**
      37             :  * Generate subkey, from keyblock
      38             :  *
      39             :  * @param context kerberos context
      40             :  * @param key session key
      41             :  * @param etype encryption type of subkey, if ETYPE_NULL, use key's enctype
      42             :  * @param subkey returned new, free with krb5_free_keyblock().
      43             :  *
      44             :  * @return 0 on success or a Kerberos 5 error code
      45             :  *
      46             : * @ingroup krb5_crypto
      47             :  */
      48             : 
      49             : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
      50      125642 : krb5_generate_subkey_extended(krb5_context context,
      51             :                               const krb5_keyblock *key,
      52             :                               krb5_enctype etype,
      53             :                               krb5_keyblock **subkey)
      54             : {
      55        3574 :     krb5_error_code ret;
      56             : 
      57      125642 :     ALLOC(*subkey, 1);
      58      125642 :     if (*subkey == NULL)
      59           0 :         return krb5_enomem(context);
      60             : 
      61      125642 :     if (etype == ETYPE_NULL)
      62       73527 :         etype = key->keytype; /* use session key etype */
      63             : 
      64             :     /* XXX should we use the session key as input to the RF? */
      65      125642 :     ret = krb5_generate_random_keyblock(context, etype, *subkey);
      66      125642 :     if (ret != 0) {
      67           0 :         free(*subkey);
      68           0 :         *subkey = NULL;
      69             :     }
      70             : 
      71      122068 :     return ret;
      72             : }
      73             :