1b528cefcSMark Murray /*
2*ae771770SStanislav Sedov * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
3b528cefcSMark Murray * (Royal Institute of Technology, Stockholm, Sweden).
4b528cefcSMark Murray * All rights reserved.
5b528cefcSMark Murray *
6b528cefcSMark Murray * Redistribution and use in source and binary forms, with or without
7b528cefcSMark Murray * modification, are permitted provided that the following conditions
8b528cefcSMark Murray * are met:
9b528cefcSMark Murray *
10b528cefcSMark Murray * 1. Redistributions of source code must retain the above copyright
11b528cefcSMark Murray * notice, this list of conditions and the following disclaimer.
12b528cefcSMark Murray *
13b528cefcSMark Murray * 2. Redistributions in binary form must reproduce the above copyright
14b528cefcSMark Murray * notice, this list of conditions and the following disclaimer in the
15b528cefcSMark Murray * documentation and/or other materials provided with the distribution.
16b528cefcSMark Murray *
17b528cefcSMark Murray * 3. Neither the name of the Institute nor the names of its contributors
18b528cefcSMark Murray * may be used to endorse or promote products derived from this software
19b528cefcSMark Murray * without specific prior written permission.
20b528cefcSMark Murray *
21b528cefcSMark Murray * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22b528cefcSMark Murray * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23b528cefcSMark Murray * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24b528cefcSMark Murray * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25b528cefcSMark Murray * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26b528cefcSMark Murray * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27b528cefcSMark Murray * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28b528cefcSMark Murray * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29b528cefcSMark Murray * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30b528cefcSMark Murray * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31b528cefcSMark Murray * SUCH DAMAGE.
32b528cefcSMark Murray */
33b528cefcSMark Murray
34*ae771770SStanislav Sedov #include "krb5_locl.h"
35b528cefcSMark Murray
36*ae771770SStanislav Sedov KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_generate_seq_number(krb5_context context,const krb5_keyblock * key,uint32_t * seqno)37b528cefcSMark Murray krb5_generate_seq_number(krb5_context context,
38b528cefcSMark Murray const krb5_keyblock *key,
39c19800e8SDoug Rabson uint32_t *seqno)
40b528cefcSMark Murray {
41*ae771770SStanislav Sedov if (RAND_bytes((void *)seqno, sizeof(*seqno)) <= 0)
42*ae771770SStanislav Sedov krb5_abortx(context, "Failed to generate random block");
43*ae771770SStanislav Sedov /* MIT used signed numbers, lets not stomp into that space directly */
44*ae771770SStanislav Sedov *seqno &= 0x3fffffff;
45*ae771770SStanislav Sedov if (*seqno == 0)
46*ae771770SStanislav Sedov *seqno = 1;
47b528cefcSMark Murray return 0;
48b528cefcSMark Murray }
49