1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
|
/*
Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
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; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* C++ based on Wei Dai's twofish.cpp from CryptoPP */
/* x86 asm original */
#if defined(TAOCRYPT_KERNEL_MODE)
#define DO_TAOCRYPT_KERNEL_MODE
#endif // only some modules now support this
#include "runtime.hpp"
#include "twofish.hpp"
namespace TaoCrypt {
#if defined(DO_TWOFISH_ASM)
// ia32 optimized version
void Twofish::Process(byte* out, const byte* in, word32 sz)
{
if (!isMMX) {
Mode_BASE::Process(out, in, sz);
return;
}
word32 blocks = sz / BLOCK_SIZE;
if (mode_ == ECB)
while (blocks--) {
if (dir_ == ENCRYPTION)
AsmEncrypt(in, out);
else
AsmDecrypt(in, out);
out += BLOCK_SIZE;
in += BLOCK_SIZE;
}
else if (mode_ == CBC) {
if (dir_ == ENCRYPTION)
while (blocks--) {
r_[0] ^= *(word32*)in;
r_[1] ^= *(word32*)(in + 4);
r_[2] ^= *(word32*)(in + 8);
r_[3] ^= *(word32*)(in + 12);
AsmEncrypt((byte*)r_, (byte*)r_);
memcpy(out, r_, BLOCK_SIZE);
out += BLOCK_SIZE;
in += BLOCK_SIZE;
}
else
while (blocks--) {
AsmDecrypt(in, out);
*(word32*)out ^= r_[0];
*(word32*)(out + 4) ^= r_[1];
*(word32*)(out + 8) ^= r_[2];
*(word32*)(out + 12) ^= r_[3];
memcpy(r_, in, BLOCK_SIZE);
out += BLOCK_SIZE;
in += BLOCK_SIZE;
}
}
}
#endif // DO_TWOFISH_ASM
namespace { // locals
// compute (c * x^4) mod (x^4 + (a + 1/a) * x^3 + a * x^2 + (a + 1/a) * x + 1)
// over GF(256)
static inline unsigned int Mod(unsigned int c)
{
static const unsigned int modulus = 0x14d;
unsigned int c2 = (c<<1) ^ ((c & 0x80) ? modulus : 0);
unsigned int c1 = c2 ^ (c>>1) ^ ((c & 1) ? (modulus>>1) : 0);
return c | (c1 << 8) | (c2 << 16) | (c1 << 24);
}
// compute RS(12,8) code with the above polynomial as generator
// this is equivalent to multiplying by the RS matrix
static word32 ReedSolomon(word32 high, word32 low)
{
for (unsigned int i=0; i<8; i++) {
high = Mod(high>>24) ^ (high<<8) ^ (low>>24);
low <<= 8;
}
return high;
}
} // local namespace
inline word32 Twofish::h0(word32 x, const word32* key, unsigned int kLen)
{
x = x | (x<<8) | (x<<16) | (x<<24);
switch(kLen)
{
#define Q(a, b, c, d, t) q_[a][GETBYTE(t,0)] ^ (q_[b][GETBYTE(t,1)] << 8) ^ \
(q_[c][GETBYTE(t,2)] << 16) ^ (q_[d][GETBYTE(t,3)] << 24)
case 4: x = Q(1, 0, 0, 1, x) ^ key[6];
case 3: x = Q(1, 1, 0, 0, x) ^ key[4];
case 2: x = Q(0, 1, 0, 1, x) ^ key[2];
x = Q(0, 0, 1, 1, x) ^ key[0];
}
return x;
}
inline word32 Twofish::h(word32 x, const word32* key, unsigned int kLen)
{
x = h0(x, key, kLen);
return mds_[0][GETBYTE(x,0)] ^ mds_[1][GETBYTE(x,1)] ^
mds_[2][GETBYTE(x,2)] ^ mds_[3][GETBYTE(x,3)];
}
void Twofish::SetKey(const byte* userKey, word32 keylen, CipherDir /*dummy*/)
{
assert(keylen >= 16 && keylen <= 32);
unsigned int len = (keylen <= 16 ? 2 : (keylen <= 24 ? 3 : 4));
word32 key[8];
GetUserKey(LittleEndianOrder, key, len*2, userKey, keylen);
unsigned int i;
for (i=0; i<40; i+=2) {
word32 a = h(i, key, len);
word32 b = rotlFixed(h(i+1, key+1, len), 8);
k_[i] = a+b;
k_[i+1] = rotlFixed(a+2*b, 9);
}
word32 svec[8];
for (i=0; i<len; i++)
svec[2*(len-i-1)] = ReedSolomon(key[2*i+1], key[2*i]);
for (i=0; i<256; i++) {
word32 t = h0(i, svec, len);
s_[0][i] = mds_[0][GETBYTE(t, 0)];
s_[1][i] = mds_[1][GETBYTE(t, 1)];
s_[2][i] = mds_[2][GETBYTE(t, 2)];
s_[3][i] = mds_[3][GETBYTE(t, 3)];
}
}
void Twofish::ProcessAndXorBlock(const byte* in, const byte* xOr, byte* out)
const
{
if (dir_ == ENCRYPTION)
encrypt(in, xOr, out);
else
decrypt(in, xOr, out);
}
#define G1(x) (s_[0][GETBYTE(x,0)] ^ s_[1][GETBYTE(x,1)] ^ \
s_[2][GETBYTE(x,2)] ^ s_[3][GETBYTE(x,3)])
#define G2(x) (s_[0][GETBYTE(x,3)] ^ s_[1][GETBYTE(x,0)] ^ \
s_[2][GETBYTE(x,1)] ^ s_[3][GETBYTE(x,2)])
#define ENCROUND(n, a, b, c, d) \
x = G1 (a); y = G2 (b); \
x += y; y += x + k[2 * (n) + 1]; \
(c) ^= x + k[2 * (n)]; \
(c) = rotrFixed(c, 1); \
(d) = rotlFixed(d, 1) ^ y
#define ENCCYCLE(n) \
ENCROUND (2 * (n), a, b, c, d); \
ENCROUND (2 * (n) + 1, c, d, a, b)
#define DECROUND(n, a, b, c, d) \
x = G1 (a); y = G2 (b); \
x += y; y += x; \
(d) ^= y + k[2 * (n) + 1]; \
(d) = rotrFixed(d, 1); \
(c) = rotlFixed(c, 1); \
(c) ^= (x + k[2 * (n)])
#define DECCYCLE(n) \
DECROUND (2 * (n) + 1, c, d, a, b); \
DECROUND (2 * (n), a, b, c, d)
typedef BlockGetAndPut<word32, LittleEndian> gpBlock;
void Twofish::encrypt(const byte* inBlock, const byte* xorBlock,
byte* outBlock) const
{
word32 x, y, a, b, c, d;
gpBlock::Get(inBlock)(a)(b)(c)(d);
a ^= k_[0];
b ^= k_[1];
c ^= k_[2];
d ^= k_[3];
const word32 *k = k_+8;
ENCCYCLE (0);
ENCCYCLE (1);
ENCCYCLE (2);
ENCCYCLE (3);
ENCCYCLE (4);
ENCCYCLE (5);
ENCCYCLE (6);
ENCCYCLE (7);
c ^= k_[4];
d ^= k_[5];
a ^= k_[6];
b ^= k_[7];
gpBlock::Put(xorBlock, outBlock)(c)(d)(a)(b);
}
void Twofish::decrypt(const byte* inBlock, const byte* xorBlock,
byte* outBlock) const
{
word32 x, y, a, b, c, d;
gpBlock::Get(inBlock)(c)(d)(a)(b);
c ^= k_[4];
d ^= k_[5];
a ^= k_[6];
b ^= k_[7];
const word32 *k = k_+8;
DECCYCLE (7);
DECCYCLE (6);
DECCYCLE (5);
DECCYCLE (4);
DECCYCLE (3);
DECCYCLE (2);
DECCYCLE (1);
DECCYCLE (0);
a ^= k_[0];
b ^= k_[1];
c ^= k_[2];
d ^= k_[3];
gpBlock::Put(xorBlock, outBlock)(a)(b)(c)(d);
}
#if defined(DO_TWOFISH_ASM)
#ifdef __GNUC__
#define AS1(x) asm(#x);
#define AS2(x, y) asm(#x ", " #y);
#define PROLOG() \
asm(".intel_syntax noprefix"); \
AS2( movd mm3, edi ) \
AS2( movd mm4, ebx ) \
AS2( movd mm5, esi ) \
AS2( movd mm6, ebp ) \
AS2( mov edi, DWORD PTR [ebp + 8] ) \
AS2( mov esi, DWORD PTR [ebp + 12] )
#define EPILOG() \
AS2( movd esp, mm6 ) \
AS2( movd esi, mm5 ) \
AS2( movd ebx, mm4 ) \
AS2( movd edi, mm3 ) \
AS1( emms ) \
asm(".att_syntax");
#else
#define AS1(x) __asm x
#define AS2(x, y) __asm x, y
#define PROLOG() \
AS1( push ebp ) \
AS2( mov ebp, esp ) \
AS2( movd mm3, edi ) \
AS2( movd mm4, ebx ) \
AS2( movd mm5, esi ) \
AS2( movd mm6, ebp ) \
AS2( mov edi, ecx ) \
AS2( mov esi, DWORD PTR [ebp + 8] )
/* ebp already set */
#define EPILOG() \
AS2( movd esi, mm5 ) \
AS2( movd ebx, mm4 ) \
AS2( movd edi, mm3 ) \
AS2( mov esp, ebp ) \
AS1( pop ebp ) \
AS1( emms ) \
AS1( ret 8 )
#endif
// x = esi, y = [esp], s_ = ebp
// edi always open for G1 and G2
// G1 also uses edx after save and restore
// G2 also uses eax after save and restore
// and ecx for tmp [esp] which Rounds also use
// and restore from mm7
// x = G1(a) bytes(0,1,2,3)
#define ASMG1(z, zl, zh) \
AS2( movd mm2, edx ) \
AS2( movzx edi, zl ) \
AS2( mov esi, DWORD PTR [ebp + edi*4] ) \
AS2( movzx edx, zh ) \
AS2( xor esi, DWORD PTR 1024[ebp + edx*4] ) \
\
AS2( mov edx, z ) \
AS2( shr edx, 16 ) \
AS2( movzx edi, dl ) \
AS2( xor esi, DWORD PTR 2048[ebp + edi*4] ) \
AS2( movzx edx, dh ) \
AS2( xor esi, DWORD PTR 3072[ebp + edx*4] ) \
AS2( movd edx, mm2 )
// y = G2(b) bytes(3,0,1,2) [ put y into ecx for Rounds ]
#define ASMG2(z, zl, zh) \
AS2( movd mm7, ecx ) \
AS2( movd mm2, eax ) \
AS2( mov edi, z ) \
AS2( shr edi, 24 ) \
AS2( mov ecx, DWORD PTR [ebp + edi*4] ) \
AS2( movzx eax, zl ) \
AS2( xor ecx, DWORD PTR 1024[ebp + eax*4] ) \
\
AS2( mov eax, z ) \
AS2( shr eax, 16 ) \
AS2( movzx edi, zh ) \
AS2( xor ecx, DWORD PTR 2048[ebp + edi*4] ) \
AS2( movzx eax, al ) \
AS2( xor ecx, DWORD PTR 3072[ebp + eax*4] ) \
AS2( movd eax, mm2 )
// encrypt Round (n),
// x = esi, k = ebp, edi open
// y is in ecx from G2, restore when done from mm7
// before C (which be same register!)
#define ASMENCROUND(N, A, A2, A3, B, B2, B3, C, D) \
/* setup s_ */ \
AS2( movd ebp, mm1 ) \
ASMG1(A, A2, A3) \
ASMG2(B, B2, B3) \
/* setup k */ \
AS2( movd ebp, mm0 ) \
/* x += y */ \
AS2( add esi, ecx ) \
AS2( add ebp, 32 ) \
/* y += x + k[2 * (n) + 1] */ \
AS2( add ecx, esi ) \
AS2( rol D, 1 ) \
AS2( add ecx, DWORD PTR [ebp + 8 * N + 4] ) \
/* (d) = rotlFixed(d, 1) ^ y */ \
AS2( xor D, ecx ) \
AS2( movd ecx, mm7 ) \
/* (c) ^= x + k[2 * (n)] */ \
AS2( mov edi, esi ) \
AS2( add edi, DWORD PTR [ebp + 8 * N] ) \
AS2( xor C, edi ) \
/* (c) = rotrFixed(c, 1) */ \
AS2( ror C, 1 )
// decrypt Round (n),
// x = esi, k = ebp, edi open
// y is in ecx from G2, restore ecx from mm7 when done
#define ASMDECROUND(N, A, A2, A3, B, B2, B3, C, D) \
/* setup s_ */ \
AS2( movd ebp, mm1 ) \
ASMG1(A, A2, A3) \
ASMG2(B, B2, B3) \
/* setup k */ \
AS2( movd ebp, mm0 ) \
/* x += y */ \
AS2( add esi, ecx ) \
AS2( add ebp, 32 ) \
/* y += x */ \
AS2( add ecx, esi ) \
/* (d) ^= y + k[2 * (n) + 1] */ \
AS2( mov edi, DWORD PTR [ebp + 8 * N + 4] ) \
AS2( add edi, ecx ) \
AS2( movd ecx, mm7 ) \
AS2( xor D, edi ) \
/* (d) = rotrFixed(d, 1) */ \
AS2( ror D, 1 ) \
/* (c) = rotlFixed(c, 1) */ \
AS2( rol C, 1 ) \
/* (c) ^= (x + k[2 * (n)]) */ \
AS2( mov edi, esi ) \
AS2( add edi, DWORD PTR [ebp + 8 * N] ) \
AS2( xor C, edi )
#ifdef _MSC_VER
__declspec(naked)
#endif
void Twofish::AsmEncrypt(const byte* inBlock, byte* outBlock) const
{
PROLOG()
#ifdef OLD_GCC_OFFSET
AS2( add edi, 60 ) // k_
#else
AS2( add edi, 56 ) // k_
#endif
AS2( mov ebp, edi )
AS2( mov eax, DWORD PTR [esi] ) // a
AS2( movd mm0, edi ) // store k_
AS2( mov ebx, DWORD PTR [esi + 4] ) // b
AS2( add ebp, 160 ) // s_[0]
AS2( mov ecx, DWORD PTR [esi + 8] ) // c
AS2( movd mm1, ebp ) // store s_
AS2( mov edx, DWORD PTR [esi + 12] ) // d
AS2( xor eax, DWORD PTR [edi] ) // k_[0]
AS2( xor ebx, DWORD PTR [edi + 4] ) // [1]
AS2( xor ecx, DWORD PTR [edi + 8] ) // [2]
AS2( xor edx, DWORD PTR [edi + 12] ) // [3]
ASMENCROUND( 0, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND( 1, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND( 2, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND( 3, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND( 4, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND( 5, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND( 6, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND( 7, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND( 8, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND( 9, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND(10, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND(11, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND(12, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND(13, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMENCROUND(14, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMENCROUND(15, ecx, cl, ch, edx, dl, dh, eax, ebx)
AS2( movd ebp, mm6 )
AS2( movd esi, mm0 ) // k_
#ifdef __GNUC__
AS2( mov edi, [ebp + 16] ) // outBlock
#else
AS2( mov edi, [ebp + 12] ) // outBlock
#endif
AS2( xor ecx, DWORD PTR [esi + 16] ) // k_[4]
AS2( xor edx, DWORD PTR [esi + 20] ) // k_[5]
AS2( xor eax, DWORD PTR [esi + 24] ) // k_[6]
AS2( xor ebx, DWORD PTR [esi + 28] ) // k_[7]
AS2( mov [edi], ecx ) // write out
AS2( mov [edi + 4], edx ) // write out
AS2( mov [edi + 8], eax ) // write out
AS2( mov [edi + 12], ebx ) // write out
EPILOG()
}
#ifdef _MSC_VER
__declspec(naked)
#endif
void Twofish::AsmDecrypt(const byte* inBlock, byte* outBlock) const
{
PROLOG()
#ifdef OLD_GCC_OFFSET
AS2( add edi, 60 ) // k_
#else
AS2( add edi, 56 ) // k_
#endif
AS2( mov ebp, edi )
AS2( mov ecx, DWORD PTR [esi] ) // c
AS2( movd mm0, edi ) // store k_
AS2( mov edx, DWORD PTR [esi + 4] ) // d
AS2( add ebp, 160 ) // s_[0]
AS2( mov eax, DWORD PTR [esi + 8] ) // a
AS2( movd mm1, ebp ) // store s_
AS2( mov ebx, DWORD PTR [esi + 12] ) // b
AS2( xor ecx, DWORD PTR [edi + 16] ) // k_[4]
AS2( xor edx, DWORD PTR [edi + 20] ) // [5]
AS2( xor eax, DWORD PTR [edi + 24] ) // [6]
AS2( xor ebx, DWORD PTR [edi + 28] ) // [7]
ASMDECROUND(15, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND(14, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND(13, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND(12, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND(11, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND(10, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND( 9, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND( 8, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND( 7, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND( 6, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND( 5, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND( 4, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND( 3, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND( 2, eax, al, ah, ebx, bl, bh, ecx, edx)
ASMDECROUND( 1, ecx, cl, ch, edx, dl, dh, eax, ebx)
ASMDECROUND( 0, eax, al, ah, ebx, bl, bh, ecx, edx)
AS2( movd ebp, mm6 )
AS2( movd esi, mm0 ) // k_
#ifdef __GNUC__
AS2( mov edi, [ebp + 16] ) // outBlock
#else
AS2( mov edi, [ebp + 12] ) // outBlock
#endif
AS2( xor eax, DWORD PTR [esi ] ) // k_[0]
AS2( xor ebx, DWORD PTR [esi + 4] ) // k_[1]
AS2( xor ecx, DWORD PTR [esi + 8] ) // k_[2]
AS2( xor edx, DWORD PTR [esi + 12] ) // k_[3]
AS2( mov [edi], eax ) // write out
AS2( mov [edi + 4], ebx ) // write out
AS2( mov [edi + 8], ecx ) // write out
AS2( mov [edi + 12], edx ) // write out
EPILOG()
}
#endif // defined(DO_TWOFISH_ASM)
} // namespace
|