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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/gen_subkey.c - Generate a subsession key based on input key */
/*
* Copyright 1991, 2002 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "k5-int.h"
static inline krb5_data
key2data (krb5_keyblock k)
{
krb5_data d;
d.magic = KV5M_DATA;
d.length = k.length;
d.data = (char *) k.contents;
return d;
}
krb5_error_code
krb5_generate_subkey_extended(krb5_context context,
const krb5_keyblock *key,
krb5_enctype enctype,
krb5_keyblock **subkey)
{
krb5_error_code retval;
krb5_data seed;
krb5_keyblock *keyblock;
*subkey = NULL;
seed = key2data(*key);
retval = krb5_c_random_add_entropy(context, KRB5_C_RANDSOURCE_TRUSTEDPARTY,
&seed);
if (retval)
return retval;
keyblock = malloc(sizeof(krb5_keyblock));
if (!keyblock)
return ENOMEM;
retval = krb5_c_make_random_key(context, enctype, keyblock);
if (retval) {
free(*subkey);
return retval;
}
*subkey = keyblock;
return 0;
}
krb5_error_code
krb5_generate_subkey(krb5_context context, const krb5_keyblock *key, krb5_keyblock **subkey)
{
return krb5_generate_subkey_extended(context, key, key->enctype, subkey);
}
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