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/* -*- mode: c; indent-tabs-mode: nil -*- */
/*
* Copyright2001 by the Massachusetts Institute of Technology.
* Copyright 1993 by OpenVision Technologies, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appears in all copies and
* that both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of OpenVision not be used
* in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. OpenVision makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "gssapiP_krb5.h"
#include "k5-int.h"
/*
* $Id$
*/
krb5_error_code
kg_make_seq_num(context, key, direction, seqnum, cksum, buf)
krb5_context context;
krb5_keyblock *key;
int direction;
krb5_ui_4 seqnum;
unsigned char *cksum;
unsigned char *buf;
{
unsigned char plain[8];
plain[4] = direction;
plain[5] = direction;
plain[6] = direction;
plain[7] = direction;
if (key->enctype == ENCTYPE_ARCFOUR_HMAC ||
key->enctype == ENCTYPE_ARCFOUR_HMAC_EXP) {
/* Yes, Microsoft used big-endian sequence number.*/
plain[0] = (seqnum>>24) & 0xff;
plain[1] = (seqnum>>16) & 0xff;
plain[2] = (seqnum>>8) & 0xff;
plain[3] = seqnum & 0xff;
return kg_arcfour_docrypt (key, 0,
cksum, 8,
&plain[0], 8,
buf);
}
plain[0] = (unsigned char) (seqnum&0xff);
plain[1] = (unsigned char) ((seqnum>>8)&0xff);
plain[2] = (unsigned char) ((seqnum>>16)&0xff);
plain[3] = (unsigned char) ((seqnum>>24)&0xff);
return(kg_encrypt(context, key, KG_USAGE_SEQ, cksum, plain, buf, 8));
}
krb5_error_code kg_get_seq_num(context, key, cksum, buf, direction, seqnum)
krb5_context context;
krb5_keyblock *key;
unsigned char *cksum;
unsigned char *buf;
int *direction;
krb5_ui_4 *seqnum;
{
krb5_error_code code;
unsigned char plain[8];
if (key->enctype == ENCTYPE_ARCFOUR_HMAC ||
key->enctype == ENCTYPE_ARCFOUR_HMAC_EXP) {
code = kg_arcfour_docrypt (key, 0,
cksum, 8,
buf, 8,
plain);
} else {
code = kg_decrypt(context, key, KG_USAGE_SEQ, cksum, buf, plain, 8);
}
if (code)
return(code);
if ((plain[4] != plain[5]) ||
(plain[4] != plain[6]) ||
(plain[4] != plain[7]))
return((krb5_error_code) KG_BAD_SEQ);
*direction = plain[4];
if (key->enctype == ENCTYPE_ARCFOUR_HMAC ||
key->enctype == ENCTYPE_ARCFOUR_HMAC_EXP) {
*seqnum = (plain[3]|(plain[2]<<8) | (plain[1]<<16)| (plain[0]<<24));
} else {
*seqnum = ((plain[0]) |
(plain[1]<<8) |
(plain[2]<<16) |
(plain[3]<<24));
}
return(0);
}
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