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-rw-r--r--arch/i386/crypto/Makefile3
-rw-r--r--arch/i386/crypto/twofish-i586-asm.S335
-rw-r--r--arch/i386/crypto/twofish.c97
3 files changed, 435 insertions, 0 deletions
diff --git a/arch/i386/crypto/Makefile b/arch/i386/crypto/Makefile
index 103c353d0a63..3fd19af18e34 100644
--- a/arch/i386/crypto/Makefile
+++ b/arch/i386/crypto/Makefile
@@ -5,5 +5,8 @@
5# 5#
6 6
7obj-$(CONFIG_CRYPTO_AES_586) += aes-i586.o 7obj-$(CONFIG_CRYPTO_AES_586) += aes-i586.o
8obj-$(CONFIG_CRYPTO_TWOFISH_586) += twofish-i586.o
8 9
9aes-i586-y := aes-i586-asm.o aes.o 10aes-i586-y := aes-i586-asm.o aes.o
11twofish-i586-y := twofish-i586-asm.o twofish.o
12
diff --git a/arch/i386/crypto/twofish-i586-asm.S b/arch/i386/crypto/twofish-i586-asm.S
new file mode 100644
index 000000000000..39b98ed2c1b9
--- /dev/null
+++ b/arch/i386/crypto/twofish-i586-asm.S
@@ -0,0 +1,335 @@
1/***************************************************************************
2* Copyright (C) 2006 by Joachim Fritschi, <jfritschi@freenet.de> *
3* *
4* This program is free software; you can redistribute it and/or modify *
5* it under the terms of the GNU General Public License as published by *
6* the Free Software Foundation; either version 2 of the License, or *
7* (at your option) any later version. *
8* *
9* This program is distributed in the hope that it will be useful, *
10* but WITHOUT ANY WARRANTY; without even the implied warranty of *
11* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
12* GNU General Public License for more details. *
13* *
14* You should have received a copy of the GNU General Public License *
15* along with this program; if not, write to the *
16* Free Software Foundation, Inc., *
17* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
18***************************************************************************/
19
20.file "twofish-i586-asm.S"
21.text
22
23#include <asm/asm-offsets.h>
24
25/* return adress at 0 */
26
27#define in_blk 12 /* input byte array address parameter*/
28#define out_blk 8 /* output byte array address parameter*/
29#define tfm 4 /* Twofish context structure */
30
31#define a_offset 0
32#define b_offset 4
33#define c_offset 8
34#define d_offset 12
35
36/* Structure of the crypto context struct*/
37
38#define s0 0 /* S0 Array 256 Words each */
39#define s1 1024 /* S1 Array */
40#define s2 2048 /* S2 Array */
41#define s3 3072 /* S3 Array */
42#define w 4096 /* 8 whitening keys (word) */
43#define k 4128 /* key 1-32 ( word ) */
44
45/* define a few register aliases to allow macro substitution */
46
47#define R0D %eax
48#define R0B %al
49#define R0H %ah
50
51#define R1D %ebx
52#define R1B %bl
53#define R1H %bh
54
55#define R2D %ecx
56#define R2B %cl
57#define R2H %ch
58
59#define R3D %edx
60#define R3B %dl
61#define R3H %dh
62
63
64/* performs input whitening */
65#define input_whitening(src,context,offset)\
66 xor w+offset(context), src;
67
68/* performs input whitening */
69#define output_whitening(src,context,offset)\
70 xor w+16+offset(context), src;
71
72/*
73 * a input register containing a (rotated 16)
74 * b input register containing b
75 * c input register containing c
76 * d input register containing d (already rol $1)
77 * operations on a and b are interleaved to increase performance
78 */
79#define encrypt_round(a,b,c,d,round)\
80 push d ## D;\
81 movzx b ## B, %edi;\
82 mov s1(%ebp,%edi,4),d ## D;\
83 movzx a ## B, %edi;\
84 mov s2(%ebp,%edi,4),%esi;\
85 movzx b ## H, %edi;\
86 ror $16, b ## D;\
87 xor s2(%ebp,%edi,4),d ## D;\
88 movzx a ## H, %edi;\
89 ror $16, a ## D;\
90 xor s3(%ebp,%edi,4),%esi;\
91 movzx b ## B, %edi;\
92 xor s3(%ebp,%edi,4),d ## D;\
93 movzx a ## B, %edi;\
94 xor (%ebp,%edi,4), %esi;\
95 movzx b ## H, %edi;\
96 ror $15, b ## D;\
97 xor (%ebp,%edi,4), d ## D;\
98 movzx a ## H, %edi;\
99 xor s1(%ebp,%edi,4),%esi;\
100 pop %edi;\
101 add d ## D, %esi;\
102 add %esi, d ## D;\
103 add k+round(%ebp), %esi;\
104 xor %esi, c ## D;\
105 rol $15, c ## D;\
106 add k+4+round(%ebp),d ## D;\
107 xor %edi, d ## D;
108
109/*
110 * a input register containing a (rotated 16)
111 * b input register containing b
112 * c input register containing c
113 * d input register containing d (already rol $1)
114 * operations on a and b are interleaved to increase performance
115 * last round has different rotations for the output preparation
116 */
117#define encrypt_last_round(a,b,c,d,round)\
118 push d ## D;\
119 movzx b ## B, %edi;\
120 mov s1(%ebp,%edi,4),d ## D;\
121 movzx a ## B, %edi;\
122 mov s2(%ebp,%edi,4),%esi;\
123 movzx b ## H, %edi;\
124 ror $16, b ## D;\
125 xor s2(%ebp,%edi,4),d ## D;\
126 movzx a ## H, %edi;\
127 ror $16, a ## D;\
128 xor s3(%ebp,%edi,4),%esi;\
129 movzx b ## B, %edi;\
130 xor s3(%ebp,%edi,4),d ## D;\
131 movzx a ## B, %edi;\
132 xor (%ebp,%edi,4), %esi;\
133 movzx b ## H, %edi;\
134 ror $16, b ## D;\
135 xor (%ebp,%edi,4), d ## D;\
136 movzx a ## H, %edi;\
137 xor s1(%ebp,%edi,4),%esi;\
138 pop %edi;\
139 add d ## D, %esi;\
140 add %esi, d ## D;\
141 add k+round(%ebp), %esi;\
142 xor %esi, c ## D;\
143 ror $1, c ## D;\
144 add k+4+round(%ebp),d ## D;\
145 xor %edi, d ## D;
146
147/*
148 * a input register containing a
149 * b input register containing b (rotated 16)
150 * c input register containing c
151 * d input register containing d (already rol $1)
152 * operations on a and b are interleaved to increase performance
153 */
154#define decrypt_round(a,b,c,d,round)\
155 push c ## D;\
156 movzx a ## B, %edi;\
157 mov (%ebp,%edi,4), c ## D;\
158 movzx b ## B, %edi;\
159 mov s3(%ebp,%edi,4),%esi;\
160 movzx a ## H, %edi;\
161 ror $16, a ## D;\
162 xor s1(%ebp,%edi,4),c ## D;\
163 movzx b ## H, %edi;\
164 ror $16, b ## D;\
165 xor (%ebp,%edi,4), %esi;\
166 movzx a ## B, %edi;\
167 xor s2(%ebp,%edi,4),c ## D;\
168 movzx b ## B, %edi;\
169 xor s1(%ebp,%edi,4),%esi;\
170 movzx a ## H, %edi;\
171 ror $15, a ## D;\
172 xor s3(%ebp,%edi,4),c ## D;\
173 movzx b ## H, %edi;\
174 xor s2(%ebp,%edi,4),%esi;\
175 pop %edi;\
176 add %esi, c ## D;\
177 add c ## D, %esi;\
178 add k+round(%ebp), c ## D;\
179 xor %edi, c ## D;\
180 add k+4+round(%ebp),%esi;\
181 xor %esi, d ## D;\
182 rol $15, d ## D;
183
184/*
185 * a input register containing a
186 * b input register containing b (rotated 16)
187 * c input register containing c
188 * d input register containing d (already rol $1)
189 * operations on a and b are interleaved to increase performance
190 * last round has different rotations for the output preparation
191 */
192#define decrypt_last_round(a,b,c,d,round)\
193 push c ## D;\
194 movzx a ## B, %edi;\
195 mov (%ebp,%edi,4), c ## D;\
196 movzx b ## B, %edi;\
197 mov s3(%ebp,%edi,4),%esi;\
198 movzx a ## H, %edi;\
199 ror $16, a ## D;\
200 xor s1(%ebp,%edi,4),c ## D;\
201 movzx b ## H, %edi;\
202 ror $16, b ## D;\
203 xor (%ebp,%edi,4), %esi;\
204 movzx a ## B, %edi;\
205 xor s2(%ebp,%edi,4),c ## D;\
206 movzx b ## B, %edi;\
207 xor s1(%ebp,%edi,4),%esi;\
208 movzx a ## H, %edi;\
209 ror $16, a ## D;\
210 xor s3(%ebp,%edi,4),c ## D;\
211 movzx b ## H, %edi;\
212 xor s2(%ebp,%edi,4),%esi;\
213 pop %edi;\
214 add %esi, c ## D;\
215 add c ## D, %esi;\
216 add k+round(%ebp), c ## D;\
217 xor %edi, c ## D;\
218 add k+4+round(%ebp),%esi;\
219 xor %esi, d ## D;\
220 ror $1, d ## D;
221
222.align 4
223.global twofish_enc_blk
224.global twofish_dec_blk
225
226twofish_enc_blk:
227 push %ebp /* save registers according to calling convention*/
228 push %ebx
229 push %esi
230 push %edi
231
232 mov tfm + 16(%esp), %ebp /* abuse the base pointer: set new base bointer to the crypto tfm */
233 add $crypto_tfm_ctx_offset, %ebp /* ctx adress */
234 mov in_blk+16(%esp),%edi /* input adress in edi */
235
236 mov (%edi), %eax
237 mov b_offset(%edi), %ebx
238 mov c_offset(%edi), %ecx
239 mov d_offset(%edi), %edx
240 input_whitening(%eax,%ebp,a_offset)
241 ror $16, %eax
242 input_whitening(%ebx,%ebp,b_offset)
243 input_whitening(%ecx,%ebp,c_offset)
244 input_whitening(%edx,%ebp,d_offset)
245 rol $1, %edx
246
247 encrypt_round(R0,R1,R2,R3,0);
248 encrypt_round(R2,R3,R0,R1,8);
249 encrypt_round(R0,R1,R2,R3,2*8);
250 encrypt_round(R2,R3,R0,R1,3*8);
251 encrypt_round(R0,R1,R2,R3,4*8);
252 encrypt_round(R2,R3,R0,R1,5*8);
253 encrypt_round(R0,R1,R2,R3,6*8);
254 encrypt_round(R2,R3,R0,R1,7*8);
255 encrypt_round(R0,R1,R2,R3,8*8);
256 encrypt_round(R2,R3,R0,R1,9*8);
257 encrypt_round(R0,R1,R2,R3,10*8);
258 encrypt_round(R2,R3,R0,R1,11*8);
259 encrypt_round(R0,R1,R2,R3,12*8);
260 encrypt_round(R2,R3,R0,R1,13*8);
261 encrypt_round(R0,R1,R2,R3,14*8);
262 encrypt_last_round(R2,R3,R0,R1,15*8);
263
264 output_whitening(%eax,%ebp,c_offset)
265 output_whitening(%ebx,%ebp,d_offset)
266 output_whitening(%ecx,%ebp,a_offset)
267 output_whitening(%edx,%ebp,b_offset)
268 mov out_blk+16(%esp),%edi;
269 mov %eax, c_offset(%edi)
270 mov %ebx, d_offset(%edi)
271 mov %ecx, (%edi)
272 mov %edx, b_offset(%edi)
273
274 pop %edi
275 pop %esi
276 pop %ebx
277 pop %ebp
278 mov $1, %eax
279 ret
280
281twofish_dec_blk:
282 push %ebp /* save registers according to calling convention*/
283 push %ebx
284 push %esi
285 push %edi
286
287
288 mov tfm + 16(%esp), %ebp /* abuse the base pointer: set new base bointer to the crypto tfm */
289 add $crypto_tfm_ctx_offset, %ebp /* ctx adress */
290 mov in_blk+16(%esp),%edi /* input adress in edi */
291
292 mov (%edi), %eax
293 mov b_offset(%edi), %ebx
294 mov c_offset(%edi), %ecx
295 mov d_offset(%edi), %edx
296 output_whitening(%eax,%ebp,a_offset)
297 output_whitening(%ebx,%ebp,b_offset)
298 ror $16, %ebx
299 output_whitening(%ecx,%ebp,c_offset)
300 output_whitening(%edx,%ebp,d_offset)
301 rol $1, %ecx
302
303 decrypt_round(R0,R1,R2,R3,15*8);
304 decrypt_round(R2,R3,R0,R1,14*8);
305 decrypt_round(R0,R1,R2,R3,13*8);
306 decrypt_round(R2,R3,R0,R1,12*8);
307 decrypt_round(R0,R1,R2,R3,11*8);
308 decrypt_round(R2,R3,R0,R1,10*8);
309 decrypt_round(R0,R1,R2,R3,9*8);
310 decrypt_round(R2,R3,R0,R1,8*8);
311 decrypt_round(R0,R1,R2,R3,7*8);
312 decrypt_round(R2,R3,R0,R1,6*8);
313 decrypt_round(R0,R1,R2,R3,5*8);
314 decrypt_round(R2,R3,R0,R1,4*8);
315 decrypt_round(R0,R1,R2,R3,3*8);
316 decrypt_round(R2,R3,R0,R1,2*8);
317 decrypt_round(R0,R1,R2,R3,1*8);
318 decrypt_last_round(R2,R3,R0,R1,0);
319
320 input_whitening(%eax,%ebp,c_offset)
321 input_whitening(%ebx,%ebp,d_offset)
322 input_whitening(%ecx,%ebp,a_offset)
323 input_whitening(%edx,%ebp,b_offset)
324 mov out_blk+16(%esp),%edi;
325 mov %eax, c_offset(%edi)
326 mov %ebx, d_offset(%edi)
327 mov %ecx, (%edi)
328 mov %edx, b_offset(%edi)
329
330 pop %edi
331 pop %esi
332 pop %ebx
333 pop %ebp
334 mov $1, %eax
335 ret
diff --git a/arch/i386/crypto/twofish.c b/arch/i386/crypto/twofish.c
new file mode 100644
index 000000000000..e3004dfe9c7a
--- /dev/null
+++ b/arch/i386/crypto/twofish.c
@@ -0,0 +1,97 @@
1/*
2 * Glue Code for optimized 586 assembler version of TWOFISH
3 *
4 * Originally Twofish for GPG
5 * By Matthew Skala <mskala@ansuz.sooke.bc.ca>, July 26, 1998
6 * 256-bit key length added March 20, 1999
7 * Some modifications to reduce the text size by Werner Koch, April, 1998
8 * Ported to the kerneli patch by Marc Mutz <Marc@Mutz.com>
9 * Ported to CryptoAPI by Colin Slater <hoho@tacomeat.net>
10 *
11 * The original author has disclaimed all copyright interest in this
12 * code and thus put it in the public domain. The subsequent authors
13 * have put this under the GNU General Public License.
14 *
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
28 * USA
29 *
30 * This code is a "clean room" implementation, written from the paper
31 * _Twofish: A 128-Bit Block Cipher_ by Bruce Schneier, John Kelsey,
32 * Doug Whiting, David Wagner, Chris Hall, and Niels Ferguson, available
33 * through http://www.counterpane.com/twofish.html
34 *
35 * For background information on multiplication in finite fields, used for
36 * the matrix operations in the key schedule, see the book _Contemporary
37 * Abstract Algebra_ by Joseph A. Gallian, especially chapter 22 in the
38 * Third Edition.
39 */
40
41#include <crypto/twofish.h>
42#include <linux/crypto.h>
43#include <linux/init.h>
44#include <linux/module.h>
45#include <linux/types.h>
46
47
48asmlinkage void twofish_enc_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
49asmlinkage void twofish_dec_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
50
51static void twofish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
52{
53 twofish_enc_blk(tfm, dst, src);
54}
55
56static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
57{
58 twofish_dec_blk(tfm, dst, src);
59}
60
61static struct crypto_alg alg = {
62 .cra_name = "twofish",
63 .cra_driver_name = "twofish-i586",
64 .cra_priority = 200,
65 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
66 .cra_blocksize = TF_BLOCK_SIZE,
67 .cra_ctxsize = sizeof(struct twofish_ctx),
68 .cra_alignmask = 3,
69 .cra_module = THIS_MODULE,
70 .cra_list = LIST_HEAD_INIT(alg.cra_list),
71 .cra_u = {
72 .cipher = {
73 .cia_min_keysize = TF_MIN_KEY_SIZE,
74 .cia_max_keysize = TF_MAX_KEY_SIZE,
75 .cia_setkey = twofish_setkey,
76 .cia_encrypt = twofish_encrypt,
77 .cia_decrypt = twofish_decrypt
78 }
79 }
80};
81
82static int __init init(void)
83{
84 return crypto_register_alg(&alg);
85}
86
87static void __exit fini(void)
88{
89 crypto_unregister_alg(&alg);
90}
91
92module_init(init);
93module_exit(fini);
94
95MODULE_LICENSE("GPL");
96MODULE_DESCRIPTION ("Twofish Cipher Algorithm, i586 asm optimized");
97MODULE_ALIAS("twofish");
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