155682Smarkm/* 278527Sassar * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan 355682Smarkm * (Royal Institute of Technology, Stockholm, Sweden). 455682Smarkm * All rights reserved. 555682Smarkm * 655682Smarkm * Redistribution and use in source and binary forms, with or without 755682Smarkm * modification, are permitted provided that the following conditions 855682Smarkm * are met: 955682Smarkm * 1055682Smarkm * 1. Redistributions of source code must retain the above copyright 1155682Smarkm * notice, this list of conditions and the following disclaimer. 1255682Smarkm * 1355682Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1455682Smarkm * notice, this list of conditions and the following disclaimer in the 1555682Smarkm * documentation and/or other materials provided with the distribution. 1655682Smarkm * 1755682Smarkm * 3. Neither the name of the Institute nor the names of its contributors 1855682Smarkm * may be used to endorse or promote products derived from this software 1955682Smarkm * without specific prior written permission. 2055682Smarkm * 2155682Smarkm * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 2255682Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2355682Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2455682Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 2555682Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2655682Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2755682Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2855682Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2955682Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3055682Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3155682Smarkm * SUCH DAMAGE. 3255682Smarkm */ 3355682Smarkm 3455682Smarkm#include <krb5_locl.h> 3555682Smarkm 36178825SdfrRCSID("$Id: generate_seq_number.c 17442 2006-05-05 09:31:15Z lha $"); 3755682Smarkm 38178825Sdfrkrb5_error_code KRB5_LIB_FUNCTION 3955682Smarkmkrb5_generate_seq_number(krb5_context context, 4055682Smarkm const krb5_keyblock *key, 41178825Sdfr uint32_t *seqno) 4255682Smarkm{ 4355682Smarkm krb5_error_code ret; 4455682Smarkm krb5_keyblock *subkey; 45178825Sdfr uint32_t q; 4655682Smarkm u_char *p; 4755682Smarkm int i; 4855682Smarkm 4955682Smarkm ret = krb5_generate_subkey (context, key, &subkey); 5055682Smarkm if (ret) 5155682Smarkm return ret; 5255682Smarkm 5355682Smarkm q = 0; 5455682Smarkm for (p = (u_char *)subkey->keyvalue.data, i = 0; 5555682Smarkm i < subkey->keyvalue.length; 5655682Smarkm ++i, ++p) 5755682Smarkm q = (q << 8) | *p; 5855682Smarkm q &= 0xffffffff; 5955682Smarkm *seqno = q; 6078527Sassar krb5_free_keyblock (context, subkey); 6155682Smarkm return 0; 6255682Smarkm} 63