/* *  linux/net/sunrpc/gss_krb5_seqnum.c * *  Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c * *  Copyright (c) 2000 The Regents of the University of Michigan. *  All rights reserved. * *  Andy Adamson   <andros@umich.edu> *//* * 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 <linux/types.h>#include <linux/slab.h>#include <linux/sunrpc/gss_krb5.h>#include <linux/crypto.h>#ifdef RPC_DEBUG# define RPCDBG_FACILITY        RPCDBG_AUTH#endifs32krb5_make_seq_num(struct crypto_tfm *key,		int direction,		s32 seqnum,		unsigned char *cksum, unsigned char *buf){	unsigned char plain[8];	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);	plain[4] = direction;	plain[5] = direction;	plain[6] = direction;	plain[7] = direction;	return krb5_encrypt(key, cksum, plain, buf, 8);}s32krb5_get_seq_num(struct crypto_tfm *key,	       unsigned char *cksum,	       unsigned char *buf,	       int *direction, s32 * seqnum){	s32 code;	unsigned char plain[8];	dprintk("RPC:      krb5_get_seq_num:\n");	if ((code = krb5_decrypt(key, cksum, buf, plain, 8)))		return code;	if ((plain[4] != plain[5]) || (plain[4] != plain[6])				   || (plain[4] != plain[7]))		return (s32)KG_BAD_SEQ;	*direction = plain[4];	*seqnum = ((plain[0]) |		   (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24));	return (0);}