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-rw-r--r--arch/x86_64/crypto/Makefile3
-rw-r--r--arch/x86_64/crypto/twofish-x86_64-asm.S324
-rw-r--r--arch/x86_64/crypto/twofish.c97
3 files changed, 424 insertions, 0 deletions
diff --git a/arch/x86_64/crypto/Makefile b/arch/x86_64/crypto/Makefile
index 426d20f4b72e..15b538a8b7f7 100644
--- a/arch/x86_64/crypto/Makefile
+++ b/arch/x86_64/crypto/Makefile
@@ -5,5 +5,8 @@
5# 5#
6 6
7obj-$(CONFIG_CRYPTO_AES_X86_64) += aes-x86_64.o 7obj-$(CONFIG_CRYPTO_AES_X86_64) += aes-x86_64.o
8obj-$(CONFIG_CRYPTO_TWOFISH_X86_64) += twofish-x86_64.o
8 9
9aes-x86_64-y := aes-x86_64-asm.o aes.o 10aes-x86_64-y := aes-x86_64-asm.o aes.o
11twofish-x86_64-y := twofish-x86_64-asm.o twofish.o
12
diff --git a/arch/x86_64/crypto/twofish-x86_64-asm.S b/arch/x86_64/crypto/twofish-x86_64-asm.S
new file mode 100644
index 000000000000..35974a586615
--- /dev/null
+++ b/arch/x86_64/crypto/twofish-x86_64-asm.S
@@ -0,0 +1,324 @@
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-x86_64-asm.S"
21.text
22
23#include <asm/asm-offsets.h>
24
25#define a_offset 0
26#define b_offset 4
27#define c_offset 8
28#define d_offset 12
29
30/* Structure of the crypto context struct*/
31
32#define s0 0 /* S0 Array 256 Words each */
33#define s1 1024 /* S1 Array */
34#define s2 2048 /* S2 Array */
35#define s3 3072 /* S3 Array */
36#define w 4096 /* 8 whitening keys (word) */
37#define k 4128 /* key 1-32 ( word ) */
38
39/* define a few register aliases to allow macro substitution */
40
41#define R0 %rax
42#define R0D %eax
43#define R0B %al
44#define R0H %ah
45
46#define R1 %rbx
47#define R1D %ebx
48#define R1B %bl
49#define R1H %bh
50
51#define R2 %rcx
52#define R2D %ecx
53#define R2B %cl
54#define R2H %ch
55
56#define R3 %rdx
57#define R3D %edx
58#define R3B %dl
59#define R3H %dh
60
61
62/* performs input whitening */
63#define input_whitening(src,context,offset)\
64 xor w+offset(context), src;
65
66/* performs input whitening */
67#define output_whitening(src,context,offset)\
68 xor w+16+offset(context), src;
69
70
71/*
72 * a input register containing a (rotated 16)
73 * b input register containing b
74 * c input register containing c
75 * d input register containing d (already rol $1)
76 * operations on a and b are interleaved to increase performance
77 */
78#define encrypt_round(a,b,c,d,round)\
79 movzx b ## B, %edi;\
80 mov s1(%r11,%rdi,4),%r8d;\
81 movzx a ## B, %edi;\
82 mov s2(%r11,%rdi,4),%r9d;\
83 movzx b ## H, %edi;\
84 ror $16, b ## D;\
85 xor s2(%r11,%rdi,4),%r8d;\
86 movzx a ## H, %edi;\
87 ror $16, a ## D;\
88 xor s3(%r11,%rdi,4),%r9d;\
89 movzx b ## B, %edi;\
90 xor s3(%r11,%rdi,4),%r8d;\
91 movzx a ## B, %edi;\
92 xor (%r11,%rdi,4), %r9d;\
93 movzx b ## H, %edi;\
94 ror $15, b ## D;\
95 xor (%r11,%rdi,4), %r8d;\
96 movzx a ## H, %edi;\
97 xor s1(%r11,%rdi,4),%r9d;\
98 add %r8d, %r9d;\
99 add %r9d, %r8d;\
100 add k+round(%r11), %r9d;\
101 xor %r9d, c ## D;\
102 rol $15, c ## D;\
103 add k+4+round(%r11),%r8d;\
104 xor %r8d, d ## D;
105
106/*
107 * a input register containing a(rotated 16)
108 * b input register containing b
109 * c input register containing c
110 * d input register containing d (already rol $1)
111 * operations on a and b are interleaved to increase performance
112 * during the round a and b are prepared for the output whitening
113 */
114#define encrypt_last_round(a,b,c,d,round)\
115 mov b ## D, %r10d;\
116 shl $32, %r10;\
117 movzx b ## B, %edi;\
118 mov s1(%r11,%rdi,4),%r8d;\
119 movzx a ## B, %edi;\
120 mov s2(%r11,%rdi,4),%r9d;\
121 movzx b ## H, %edi;\
122 ror $16, b ## D;\
123 xor s2(%r11,%rdi,4),%r8d;\
124 movzx a ## H, %edi;\
125 ror $16, a ## D;\
126 xor s3(%r11,%rdi,4),%r9d;\
127 movzx b ## B, %edi;\
128 xor s3(%r11,%rdi,4),%r8d;\
129 movzx a ## B, %edi;\
130 xor (%r11,%rdi,4), %r9d;\
131 xor a, %r10;\
132 movzx b ## H, %edi;\
133 xor (%r11,%rdi,4), %r8d;\
134 movzx a ## H, %edi;\
135 xor s1(%r11,%rdi,4),%r9d;\
136 add %r8d, %r9d;\
137 add %r9d, %r8d;\
138 add k+round(%r11), %r9d;\
139 xor %r9d, c ## D;\
140 ror $1, c ## D;\
141 add k+4+round(%r11),%r8d;\
142 xor %r8d, d ## D
143
144/*
145 * a input register containing a
146 * b input register containing b (rotated 16)
147 * c input register containing c (already rol $1)
148 * d input register containing d
149 * operations on a and b are interleaved to increase performance
150 */
151#define decrypt_round(a,b,c,d,round)\
152 movzx a ## B, %edi;\
153 mov (%r11,%rdi,4), %r9d;\
154 movzx b ## B, %edi;\
155 mov s3(%r11,%rdi,4),%r8d;\
156 movzx a ## H, %edi;\
157 ror $16, a ## D;\
158 xor s1(%r11,%rdi,4),%r9d;\
159 movzx b ## H, %edi;\
160 ror $16, b ## D;\
161 xor (%r11,%rdi,4), %r8d;\
162 movzx a ## B, %edi;\
163 xor s2(%r11,%rdi,4),%r9d;\
164 movzx b ## B, %edi;\
165 xor s1(%r11,%rdi,4),%r8d;\
166 movzx a ## H, %edi;\
167 ror $15, a ## D;\
168 xor s3(%r11,%rdi,4),%r9d;\
169 movzx b ## H, %edi;\
170 xor s2(%r11,%rdi,4),%r8d;\
171 add %r8d, %r9d;\
172 add %r9d, %r8d;\
173 add k+round(%r11), %r9d;\
174 xor %r9d, c ## D;\
175 add k+4+round(%r11),%r8d;\
176 xor %r8d, d ## D;\
177 rol $15, d ## D;
178
179/*
180 * a input register containing a
181 * b input register containing b
182 * c input register containing c (already rol $1)
183 * d input register containing d
184 * operations on a and b are interleaved to increase performance
185 * during the round a and b are prepared for the output whitening
186 */
187#define decrypt_last_round(a,b,c,d,round)\
188 movzx a ## B, %edi;\
189 mov (%r11,%rdi,4), %r9d;\
190 movzx b ## B, %edi;\
191 mov s3(%r11,%rdi,4),%r8d;\
192 movzx b ## H, %edi;\
193 ror $16, b ## D;\
194 xor (%r11,%rdi,4), %r8d;\
195 movzx a ## H, %edi;\
196 mov b ## D, %r10d;\
197 shl $32, %r10;\
198 xor a, %r10;\
199 ror $16, a ## D;\
200 xor s1(%r11,%rdi,4),%r9d;\
201 movzx b ## B, %edi;\
202 xor s1(%r11,%rdi,4),%r8d;\
203 movzx a ## B, %edi;\
204 xor s2(%r11,%rdi,4),%r9d;\
205 movzx b ## H, %edi;\
206 xor s2(%r11,%rdi,4),%r8d;\
207 movzx a ## H, %edi;\
208 xor s3(%r11,%rdi,4),%r9d;\
209 add %r8d, %r9d;\
210 add %r9d, %r8d;\
211 add k+round(%r11), %r9d;\
212 xor %r9d, c ## D;\
213 add k+4+round(%r11),%r8d;\
214 xor %r8d, d ## D;\
215 ror $1, d ## D;
216
217.align 8
218.global twofish_enc_blk
219.global twofish_dec_blk
220
221twofish_enc_blk:
222 pushq R1
223
224 /* %rdi contains the crypto tfm adress */
225 /* %rsi contains the output adress */
226 /* %rdx contains the input adress */
227 add $crypto_tfm_ctx_offset, %rdi /* set ctx adress */
228 /* ctx adress is moved to free one non-rex register
229 as target for the 8bit high operations */
230 mov %rdi, %r11
231
232 movq (R3), R1
233 movq 8(R3), R3
234 input_whitening(R1,%r11,a_offset)
235 input_whitening(R3,%r11,c_offset)
236 mov R1D, R0D
237 rol $16, R0D
238 shr $32, R1
239 mov R3D, R2D
240 shr $32, R3
241 rol $1, R3D
242
243 encrypt_round(R0,R1,R2,R3,0);
244 encrypt_round(R2,R3,R0,R1,8);
245 encrypt_round(R0,R1,R2,R3,2*8);
246 encrypt_round(R2,R3,R0,R1,3*8);
247 encrypt_round(R0,R1,R2,R3,4*8);
248 encrypt_round(R2,R3,R0,R1,5*8);
249 encrypt_round(R0,R1,R2,R3,6*8);
250 encrypt_round(R2,R3,R0,R1,7*8);
251 encrypt_round(R0,R1,R2,R3,8*8);
252 encrypt_round(R2,R3,R0,R1,9*8);
253 encrypt_round(R0,R1,R2,R3,10*8);
254 encrypt_round(R2,R3,R0,R1,11*8);
255 encrypt_round(R0,R1,R2,R3,12*8);
256 encrypt_round(R2,R3,R0,R1,13*8);
257 encrypt_round(R0,R1,R2,R3,14*8);
258 encrypt_last_round(R2,R3,R0,R1,15*8);
259
260
261 output_whitening(%r10,%r11,a_offset)
262 movq %r10, (%rsi)
263
264 shl $32, R1
265 xor R0, R1
266
267 output_whitening(R1,%r11,c_offset)
268 movq R1, 8(%rsi)
269
270 popq R1
271 movq $1,%rax
272 ret
273
274twofish_dec_blk:
275 pushq R1
276
277 /* %rdi contains the crypto tfm adress */
278 /* %rsi contains the output adress */
279 /* %rdx contains the input adress */
280 add $crypto_tfm_ctx_offset, %rdi /* set ctx adress */
281 /* ctx adress is moved to free one non-rex register
282 as target for the 8bit high operations */
283 mov %rdi, %r11
284
285 movq (R3), R1
286 movq 8(R3), R3
287 output_whitening(R1,%r11,a_offset)
288 output_whitening(R3,%r11,c_offset)
289 mov R1D, R0D
290 shr $32, R1
291 rol $16, R1D
292 mov R3D, R2D
293 shr $32, R3
294 rol $1, R2D
295
296 decrypt_round(R0,R1,R2,R3,15*8);
297 decrypt_round(R2,R3,R0,R1,14*8);
298 decrypt_round(R0,R1,R2,R3,13*8);
299 decrypt_round(R2,R3,R0,R1,12*8);
300 decrypt_round(R0,R1,R2,R3,11*8);
301 decrypt_round(R2,R3,R0,R1,10*8);
302 decrypt_round(R0,R1,R2,R3,9*8);
303 decrypt_round(R2,R3,R0,R1,8*8);
304 decrypt_round(R0,R1,R2,R3,7*8);
305 decrypt_round(R2,R3,R0,R1,6*8);
306 decrypt_round(R0,R1,R2,R3,5*8);
307 decrypt_round(R2,R3,R0,R1,4*8);
308 decrypt_round(R0,R1,R2,R3,3*8);
309 decrypt_round(R2,R3,R0,R1,2*8);
310 decrypt_round(R0,R1,R2,R3,1*8);
311 decrypt_last_round(R2,R3,R0,R1,0);
312
313 input_whitening(%r10,%r11,a_offset)
314 movq %r10, (%rsi)
315
316 shl $32, R1
317 xor R0, R1
318
319 input_whitening(R1,%r11,c_offset)
320 movq R1, 8(%rsi)
321
322 popq R1
323 movq $1,%rax
324 ret
diff --git a/arch/x86_64/crypto/twofish.c b/arch/x86_64/crypto/twofish.c
new file mode 100644
index 000000000000..182d91d5cfb9
--- /dev/null
+++ b/arch/x86_64/crypto/twofish.c
@@ -0,0 +1,97 @@
1/*
2 * Glue Code for optimized x86_64 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/kernel.h>
45#include <linux/module.h>
46#include <linux/types.h>
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-x86_64",
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, x86_64 asm optimized");
97MODULE_ALIAS("twofish");
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