ia64/linux-2.6.18-xen.hg

view arch/s390/crypto/des_check_key.c @ 647:a5bb490065f6

Fix the build after public header sync.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Wed Aug 13 14:01:49 2008 +0100 (2008-08-13)
parents 831230e53067
children
line source
1 /*
2 * Cryptographic API.
3 *
4 * Function for checking keys for the DES and Tripple DES Encryption
5 * algorithms.
6 *
7 * Originally released as descore by Dana L. How <how@isl.stanford.edu>.
8 * Modified by Raimar Falke <rf13@inf.tu-dresden.de> for the Linux-Kernel.
9 * Derived from Cryptoapi and Nettle implementations, adapted for in-place
10 * scatterlist interface. Changed LGPL to GPL per section 3 of the LGPL.
11 *
12 * s390 Version:
13 * Copyright (C) 2003 IBM Deutschland GmbH, IBM Corporation
14 * Author(s): Thomas Spatzier (tspat@de.ibm.com)
15 *
16 * Derived from "crypto/des.c"
17 * Copyright (c) 1992 Dana L. How.
18 * Copyright (c) Raimar Falke <rf13@inf.tu-dresden.de>
19 * Copyright (c) Gisle Sflensminde <gisle@ii.uib.no>
20 * Copyright (C) 2001 Niels Mvller.
21 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
22 *
23 * This program is free software; you can redistribute it and/or modify
24 * it under the terms of the GNU General Public License as published by
25 * the Free Software Foundation; either version 2 of the License, or
26 * (at your option) any later version.
27 *
28 */
29 #include <linux/init.h>
30 #include <linux/module.h>
31 #include <linux/errno.h>
32 #include <linux/crypto.h>
34 #define ROR(d,c,o) ((d) = (d) >> (c) | (d) << (o))
36 static const u8 parity[] = {
37 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,
38 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,
39 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,
40 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,
41 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,
42 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,
43 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,
44 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,
45 };
47 /*
48 * RFC2451: Weak key checks SHOULD be performed.
49 */
50 int
51 crypto_des_check_key(const u8 *key, unsigned int keylen, u32 *flags)
52 {
53 u32 n, w;
55 n = parity[key[0]]; n <<= 4;
56 n |= parity[key[1]]; n <<= 4;
57 n |= parity[key[2]]; n <<= 4;
58 n |= parity[key[3]]; n <<= 4;
59 n |= parity[key[4]]; n <<= 4;
60 n |= parity[key[5]]; n <<= 4;
61 n |= parity[key[6]]; n <<= 4;
62 n |= parity[key[7]];
63 w = 0x88888888L;
65 if ((*flags & CRYPTO_TFM_REQ_WEAK_KEY)
66 && !((n - (w >> 3)) & w)) { /* 1 in 10^10 keys passes this test */
67 if (n < 0x41415151) {
68 if (n < 0x31312121) {
69 if (n < 0x14141515) {
70 /* 01 01 01 01 01 01 01 01 */
71 if (n == 0x11111111) goto weak;
72 /* 01 1F 01 1F 01 0E 01 0E */
73 if (n == 0x13131212) goto weak;
74 } else {
75 /* 01 E0 01 E0 01 F1 01 F1 */
76 if (n == 0x14141515) goto weak;
77 /* 01 FE 01 FE 01 FE 01 FE */
78 if (n == 0x16161616) goto weak;
79 }
80 } else {
81 if (n < 0x34342525) {
82 /* 1F 01 1F 01 0E 01 0E 01 */
83 if (n == 0x31312121) goto weak;
84 /* 1F 1F 1F 1F 0E 0E 0E 0E (?) */
85 if (n == 0x33332222) goto weak;
86 } else {
87 /* 1F E0 1F E0 0E F1 0E F1 */
88 if (n == 0x34342525) goto weak;
89 /* 1F FE 1F FE 0E FE 0E FE */
90 if (n == 0x36362626) goto weak;
91 }
92 }
93 } else {
94 if (n < 0x61616161) {
95 if (n < 0x44445555) {
96 /* E0 01 E0 01 F1 01 F1 01 */
97 if (n == 0x41415151) goto weak;
98 /* E0 1F E0 1F F1 0E F1 0E */
99 if (n == 0x43435252) goto weak;
100 } else {
101 /* E0 E0 E0 E0 F1 F1 F1 F1 (?) */
102 if (n == 0x44445555) goto weak;
103 /* E0 FE E0 FE F1 FE F1 FE */
104 if (n == 0x46465656) goto weak;
105 }
106 } else {
107 if (n < 0x64646565) {
108 /* FE 01 FE 01 FE 01 FE 01 */
109 if (n == 0x61616161) goto weak;
110 /* FE 1F FE 1F FE 0E FE 0E */
111 if (n == 0x63636262) goto weak;
112 } else {
113 /* FE E0 FE E0 FE F1 FE F1 */
114 if (n == 0x64646565) goto weak;
115 /* FE FE FE FE FE FE FE FE */
116 if (n == 0x66666666) goto weak;
117 }
118 }
119 }
120 }
121 return 0;
122 weak:
123 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
124 return -EINVAL;
125 }
127 EXPORT_SYMBOL(crypto_des_check_key);
129 MODULE_LICENSE("GPL");
130 MODULE_DESCRIPTION("Key Check function for DES & DES3 Cipher Algorithms");