cifs: have calc_lanman_hash take more granular args

cifs: have calc_lanman_hash take more granular args

We need to use this routine to encrypt passwords associated with the
tcon too. Don't assume that the password will be attached to the
smb_session.

Also, make some of the values in the lower encryption functions
const since they aren't changed.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifsencrypt.h b/fs/cifs/cifsencrypt.h
index 152fa2d..15d2ec0 100644
--- a/fs/cifs/cifsencrypt.h
+++ b/fs/cifs/cifsencrypt.h
@@ -26,7 +26,8 @@
 extern void mdfour(unsigned char *out, unsigned char *in, int n);
 /* smbdes.c */
 extern void E_P16(unsigned char *p14, unsigned char *p16);
-extern void E_P24(unsigned char *p21, unsigned char *c8, unsigned char *p24);
+extern void E_P24(unsigned char *p21, const unsigned char *c8,
+		  unsigned char *p24);