1 files changed, 88 insertions, 0 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_seqnum.c b/net/sunrpc/auth_gss/gss_krb5_seqnum.c
new file mode 100644
index 00000000000..c53ead39118
--- /dev/null
+++ b/net/sunrpc/auth_gss/gss_krb5_seqnum.c
@@ -0,0 +1,88 @@
+/*
+ *  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
+#endif
+
+s32
+krb5_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);
+}
+
+s32
+krb5_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);
+}