crypto: s390 - cleanup DES code

Remove a stale file left over from 1efbd15c
and and cleanup the DES code a bit to make it easier to add new code.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/s390/crypto/des_check_key.c

-/*
- * Cryptographic API.
- *
- * Function for checking keys for the DES and Tripple DES Encryption
- * algorithms.
- *
- * Originally released as descore by Dana L. How <how@isl.stanford.edu>.
- * Modified by Raimar Falke <rf13@inf.tu-dresden.de> for the Linux-Kernel.
- * Derived from Cryptoapi and Nettle implementations, adapted for in-place
- * scatterlist interface.  Changed LGPL to GPL per section 3 of the LGPL.
- *
- * s390 Version:
- *   Copyright IBM Corp. 2003
- *   Author(s): Thomas Spatzier
- *		Jan Glauber (jan.glauber@de.ibm.com)
- *
- * Derived from "crypto/des.c"
- *   Copyright (c) 1992 Dana L. How.
- *   Copyright (c) Raimar Falke <rf13@inf.tu-dresden.de>
- *   Copyright (c) Gisle Sflensminde <gisle@ii.uib.no>
- *   Copyright (C) 2001 Niels Mvller.
- *   Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- */
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/crypto.h>
-#include "crypto_des.h"
-
-#define ROR(d,c,o)	((d) = (d) >> (c) | (d) << (o))
-
-static const u8 parity[] = {
-	8,1,0,8,0,8,8,0,0,8,8,0,8,0,2,8,0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,3,
-	0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,
-	0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,
-	8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,
-	0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,
-	8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,
-	8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,
-	4,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,8,5,0,8,0,8,8,0,0,8,8,0,8,0,6,8,
-};
-
-/*
- * RFC2451: Weak key checks SHOULD be performed.
- */
-int
-crypto_des_check_key(const u8 *key, unsigned int keylen, u32 *flags)
-{
-	u32 n, w;
-
-	n  = parity[key[0]]; n <<= 4;
-	n |= parity[key[1]]; n <<= 4;
-	n |= parity[key[2]]; n <<= 4;
-	n |= parity[key[3]]; n <<= 4;
-	n |= parity[key[4]]; n <<= 4;
-	n |= parity[key[5]]; n <<= 4;
-	n |= parity[key[6]]; n <<= 4;
-	n |= parity[key[7]];
-	w = 0x88888888L;
-
-	if ((*flags & CRYPTO_TFM_REQ_WEAK_KEY)
-	    && !((n - (w >> 3)) & w)) {  /* 1 in 10^10 keys passes this test */
-		if (n < 0x41415151) {
-			if (n < 0x31312121) {
-				if (n < 0x14141515) {
-					/* 01 01 01 01 01 01 01 01 */
-					if (n == 0x11111111) goto weak;
-					/* 01 1F 01 1F 01 0E 01 0E */
-					if (n == 0x13131212) goto weak;
-				} else {
-					/* 01 E0 01 E0 01 F1 01 F1 */
-					if (n == 0x14141515) goto weak;
-					/* 01 FE 01 FE 01 FE 01 FE */
-					if (n == 0x16161616) goto weak;
-				}
-			} else {
-				if (n < 0x34342525) {
-					/* 1F 01 1F 01 0E 01 0E 01 */
-					if (n == 0x31312121) goto weak;
-					/* 1F 1F 1F 1F 0E 0E 0E 0E (?) */
-					if (n == 0x33332222) goto weak;
-				} else {
-					/* 1F E0 1F E0 0E F1 0E F1 */
-					if (n == 0x34342525) goto weak;
-					/* 1F FE 1F FE 0E FE 0E FE */
-					if (n == 0x36362626) goto weak;
-				}
-			}
-		} else {
-			if (n < 0x61616161) {
-				if (n < 0x44445555) {
-					/* E0 01 E0 01 F1 01 F1 01 */
-					if (n == 0x41415151) goto weak;
-					/* E0 1F E0 1F F1 0E F1 0E */
-					if (n == 0x43435252) goto weak;
-				} else {
-					/* E0 E0 E0 E0 F1 F1 F1 F1 (?) */
-					if (n == 0x44445555) goto weak;
-					/* E0 FE E0 FE F1 FE F1 FE */
-					if (n == 0x46465656) goto weak;
-				}
-			} else {
-				if (n < 0x64646565) {
-					/* FE 01 FE 01 FE 01 FE 01 */
-					if (n == 0x61616161) goto weak;
-					/* FE 1F FE 1F FE 0E FE 0E */
-					if (n == 0x63636262) goto weak;
-				} else {
-					/* FE E0 FE E0 FE F1 FE F1 */
-					if (n == 0x64646565) goto weak;
-					/* FE FE FE FE FE FE FE FE */
-					if (n == 0x66666666) goto weak;
-				}
-			}
-		}
-	}
-	return 0;
-weak:
-	*flags |= CRYPTO_TFM_RES_WEAK_KEY;
-	return -EINVAL;
-}
-
-EXPORT_SYMBOL(crypto_des_check_key);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Key Check function for DES &  DES3 Cipher Algorithms");