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/*
* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
/**
* Generate subkey, from keyblock
*
* @param context kerberos context
* @param key session key
* @param etype encryption type of subkey, if ETYPE_NULL, use key's enctype
* @param subkey returned new, free with krb5_free_keyblock().
*
* @return 0 on success or a Kerberos 5 error code
*
* @ingroup krb5_crypto
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_generate_subkey_extended(krb5_context context,
const krb5_keyblock *key,
krb5_enctype etype,
krb5_keyblock **subkey)
{
krb5_error_code ret;
ALLOC(*subkey, 1);
if (*subkey == NULL)
return krb5_enomem(context);
if (etype == ETYPE_NULL)
etype = key->keytype; /* use session key etype */
/* XXX should we use the session key as input to the RF? */
ret = krb5_generate_random_keyblock(context, etype, *subkey);
if (ret != 0) {
free(*subkey);
*subkey = NULL;
}
return ret;
}
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