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 krb5_generate_subkey_extended(krb5_context context, 51 const krb5_keyblock *key, 52 krb5_enctype etype, 53 krb5_keyblock **subkey) 54 { 55 krb5_error_code ret; 56 57 ALLOC(*subkey, 1); 58 if (*subkey == NULL) { 59 krb5_set_error_message(context, ENOMEM,N_("malloc: out of memory", "")); 60 return ENOMEM; 61 } 62 63 if (etype == ETYPE_NULL) 64 etype = key->keytype; /* use session key etype */ 65 66 /* XXX should we use the session key as input to the RF? */ 67 ret = krb5_generate_random_keyblock(context, etype, *subkey); 68 if (ret != 0) { 69 free(*subkey); 70 *subkey = NULL; 71 } 72 73 return ret; 74 } 75 76