/* * lib/krb5/krb/gen_subkey.c * * 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. * * * Routine to automatically generate a subsession key based on an input key. */ #include "k5-int.h" krb5_error_code krb5_generate_subkey(krb5_context context, const krb5_keyblock *key, krb5_keyblock **subkey) { krb5_error_code retval; krb5_data seed; seed.length = key->length; seed.data = key->contents; if ((retval = krb5_c_random_add_entropy(context, KRB5_C_RANDSOURCE_TRUSTEDPARTY, &seed))) return(retval); if ((*subkey = (krb5_keyblock *) malloc(sizeof(krb5_keyblock))) == NULL) return(ENOMEM); if ((retval = krb5_c_make_random_key(context, key->enctype, *subkey))) { krb5_xfree(*subkey); return(retval); } return(0); }