1 /* SPDX-License-Identifier: GPL-2.0-or-later *
2 /*********************************************
3 * Copyright (C) 2006 by Joachim Fritschi, <jf
4 *
5 **********************************************
6
7 .file "twofish-x86_64-asm.S"
8 .text
9
10 #include <linux/linkage.h>
11 #include <asm/asm-offsets.h>
12
13 #define a_offset 0
14 #define b_offset 4
15 #define c_offset 8
16 #define d_offset 12
17
18 /* Structure of the crypto context struct*/
19
20 #define s0 0 /* S0 Array 256 Words
21 #define s1 1024 /* S1 Array */
22 #define s2 2048 /* S2 Array */
23 #define s3 3072 /* S3 Array */
24 #define w 4096 /* 8 whitening keys (w
25 #define k 4128 /* key 1-32 ( word ) *
26
27 /* define a few register aliases to allow macr
28
29 #define R0 %rax
30 #define R0D %eax
31 #define R0B %al
32 #define R0H %ah
33
34 #define R1 %rbx
35 #define R1D %ebx
36 #define R1B %bl
37 #define R1H %bh
38
39 #define R2 %rcx
40 #define R2D %ecx
41 #define R2B %cl
42 #define R2H %ch
43
44 #define R3 %rdx
45 #define R3D %edx
46 #define R3B %dl
47 #define R3H %dh
48
49
50 /* performs input whitening */
51 #define input_whitening(src,context,offset)\
52 xor w+offset(context), src;
53
54 /* performs input whitening */
55 #define output_whitening(src,context,offset)\
56 xor w+16+offset(context), src;
57
58
59 /*
60 * a input register containing a (rotated 16)
61 * b input register containing b
62 * c input register containing c
63 * d input register containing d (already rol
64 * operations on a and b are interleaved to in
65 */
66 #define encrypt_round(a,b,c,d,round)\
67 movzx b ## B, %edi;\
68 mov s1(%r11,%rdi,4),%r8d;\
69 movzx a ## B, %edi;\
70 mov s2(%r11,%rdi,4),%r9d;\
71 movzx b ## H, %edi;\
72 ror $16, b ## D;\
73 xor s2(%r11,%rdi,4),%r8d;\
74 movzx a ## H, %edi;\
75 ror $16, a ## D;\
76 xor s3(%r11,%rdi,4),%r9d;\
77 movzx b ## B, %edi;\
78 xor s3(%r11,%rdi,4),%r8d;\
79 movzx a ## B, %edi;\
80 xor (%r11,%rdi,4), %r9d;\
81 movzx b ## H, %edi;\
82 ror $15, b ## D;\
83 xor (%r11,%rdi,4), %r8d;\
84 movzx a ## H, %edi;\
85 xor s1(%r11,%rdi,4),%r9d;\
86 add %r8d, %r9d;\
87 add %r9d, %r8d;\
88 add k+round(%r11), %r9d;\
89 xor %r9d, c ## D;\
90 rol $15, c ## D;\
91 add k+4+round(%r11),%r8d;\
92 xor %r8d, d ## D;
93
94 /*
95 * a input register containing a(rotated 16)
96 * b input register containing b
97 * c input register containing c
98 * d input register containing d (already rol
99 * operations on a and b are interleaved to in
100 * during the round a and b are prepared for t
101 */
102 #define encrypt_last_round(a,b,c,d,round)\
103 mov b ## D, %r10d;\
104 shl $32, %r10;\
105 movzx b ## B, %edi;\
106 mov s1(%r11,%rdi,4),%r8d;\
107 movzx a ## B, %edi;\
108 mov s2(%r11,%rdi,4),%r9d;\
109 movzx b ## H, %edi;\
110 ror $16, b ## D;\
111 xor s2(%r11,%rdi,4),%r8d;\
112 movzx a ## H, %edi;\
113 ror $16, a ## D;\
114 xor s3(%r11,%rdi,4),%r9d;\
115 movzx b ## B, %edi;\
116 xor s3(%r11,%rdi,4),%r8d;\
117 movzx a ## B, %edi;\
118 xor (%r11,%rdi,4), %r9d;\
119 xor a, %r10;\
120 movzx b ## H, %edi;\
121 xor (%r11,%rdi,4), %r8d;\
122 movzx a ## H, %edi;\
123 xor s1(%r11,%rdi,4),%r9d;\
124 add %r8d, %r9d;\
125 add %r9d, %r8d;\
126 add k+round(%r11), %r9d;\
127 xor %r9d, c ## D;\
128 ror $1, c ## D;\
129 add k+4+round(%r11),%r8d;\
130 xor %r8d, d ## D
131
132 /*
133 * a input register containing a
134 * b input register containing b (rotated 16)
135 * c input register containing c (already rol
136 * d input register containing d
137 * operations on a and b are interleaved to in
138 */
139 #define decrypt_round(a,b,c,d,round)\
140 movzx a ## B, %edi;\
141 mov (%r11,%rdi,4), %r9d;\
142 movzx b ## B, %edi;\
143 mov s3(%r11,%rdi,4),%r8d;\
144 movzx a ## H, %edi;\
145 ror $16, a ## D;\
146 xor s1(%r11,%rdi,4),%r9d;\
147 movzx b ## H, %edi;\
148 ror $16, b ## D;\
149 xor (%r11,%rdi,4), %r8d;\
150 movzx a ## B, %edi;\
151 xor s2(%r11,%rdi,4),%r9d;\
152 movzx b ## B, %edi;\
153 xor s1(%r11,%rdi,4),%r8d;\
154 movzx a ## H, %edi;\
155 ror $15, a ## D;\
156 xor s3(%r11,%rdi,4),%r9d;\
157 movzx b ## H, %edi;\
158 xor s2(%r11,%rdi,4),%r8d;\
159 add %r8d, %r9d;\
160 add %r9d, %r8d;\
161 add k+round(%r11), %r9d;\
162 xor %r9d, c ## D;\
163 add k+4+round(%r11),%r8d;\
164 xor %r8d, d ## D;\
165 rol $15, d ## D;
166
167 /*
168 * a input register containing a
169 * b input register containing b
170 * c input register containing c (already rol
171 * d input register containing d
172 * operations on a and b are interleaved to in
173 * during the round a and b are prepared for t
174 */
175 #define decrypt_last_round(a,b,c,d,round)\
176 movzx a ## B, %edi;\
177 mov (%r11,%rdi,4), %r9d;\
178 movzx b ## B, %edi;\
179 mov s3(%r11,%rdi,4),%r8d;\
180 movzx b ## H, %edi;\
181 ror $16, b ## D;\
182 xor (%r11,%rdi,4), %r8d;\
183 movzx a ## H, %edi;\
184 mov b ## D, %r10d;\
185 shl $32, %r10;\
186 xor a, %r10;\
187 ror $16, a ## D;\
188 xor s1(%r11,%rdi,4),%r9d;\
189 movzx b ## B, %edi;\
190 xor s1(%r11,%rdi,4),%r8d;\
191 movzx a ## B, %edi;\
192 xor s2(%r11,%rdi,4),%r9d;\
193 movzx b ## H, %edi;\
194 xor s2(%r11,%rdi,4),%r8d;\
195 movzx a ## H, %edi;\
196 xor s3(%r11,%rdi,4),%r9d;\
197 add %r8d, %r9d;\
198 add %r9d, %r8d;\
199 add k+round(%r11), %r9d;\
200 xor %r9d, c ## D;\
201 add k+4+round(%r11),%r8d;\
202 xor %r8d, d ## D;\
203 ror $1, d ## D;
204
205 SYM_FUNC_START(twofish_enc_blk)
206 pushq R1
207
208 /* %rdi contains the ctx address */
209 /* %rsi contains the output address */
210 /* %rdx contains the input address */
211 /* ctx address is moved to free one no
212 as target for the 8bit high operations
213 mov %rdi, %r11
214
215 movq (R3), R1
216 movq 8(R3), R3
217 input_whitening(R1,%r11,a_offset)
218 input_whitening(R3,%r11,c_offset)
219 mov R1D, R0D
220 rol $16, R0D
221 shr $32, R1
222 mov R3D, R2D
223 shr $32, R3
224 rol $1, R3D
225
226 encrypt_round(R0,R1,R2,R3,0);
227 encrypt_round(R2,R3,R0,R1,8);
228 encrypt_round(R0,R1,R2,R3,2*8);
229 encrypt_round(R2,R3,R0,R1,3*8);
230 encrypt_round(R0,R1,R2,R3,4*8);
231 encrypt_round(R2,R3,R0,R1,5*8);
232 encrypt_round(R0,R1,R2,R3,6*8);
233 encrypt_round(R2,R3,R0,R1,7*8);
234 encrypt_round(R0,R1,R2,R3,8*8);
235 encrypt_round(R2,R3,R0,R1,9*8);
236 encrypt_round(R0,R1,R2,R3,10*8);
237 encrypt_round(R2,R3,R0,R1,11*8);
238 encrypt_round(R0,R1,R2,R3,12*8);
239 encrypt_round(R2,R3,R0,R1,13*8);
240 encrypt_round(R0,R1,R2,R3,14*8);
241 encrypt_last_round(R2,R3,R0,R1,15*8);
242
243
244 output_whitening(%r10,%r11,a_offset)
245 movq %r10, (%rsi)
246
247 shl $32, R1
248 xor R0, R1
249
250 output_whitening(R1,%r11,c_offset)
251 movq R1, 8(%rsi)
252
253 popq R1
254 movl $1,%eax
255 RET
256 SYM_FUNC_END(twofish_enc_blk)
257
258 SYM_FUNC_START(twofish_dec_blk)
259 pushq R1
260
261 /* %rdi contains the ctx address */
262 /* %rsi contains the output address */
263 /* %rdx contains the input address */
264 /* ctx address is moved to free one no
265 as target for the 8bit high operations
266 mov %rdi, %r11
267
268 movq (R3), R1
269 movq 8(R3), R3
270 output_whitening(R1,%r11,a_offset)
271 output_whitening(R3,%r11,c_offset)
272 mov R1D, R0D
273 shr $32, R1
274 rol $16, R1D
275 mov R3D, R2D
276 shr $32, R3
277 rol $1, R2D
278
279 decrypt_round(R0,R1,R2,R3,15*8);
280 decrypt_round(R2,R3,R0,R1,14*8);
281 decrypt_round(R0,R1,R2,R3,13*8);
282 decrypt_round(R2,R3,R0,R1,12*8);
283 decrypt_round(R0,R1,R2,R3,11*8);
284 decrypt_round(R2,R3,R0,R1,10*8);
285 decrypt_round(R0,R1,R2,R3,9*8);
286 decrypt_round(R2,R3,R0,R1,8*8);
287 decrypt_round(R0,R1,R2,R3,7*8);
288 decrypt_round(R2,R3,R0,R1,6*8);
289 decrypt_round(R0,R1,R2,R3,5*8);
290 decrypt_round(R2,R3,R0,R1,4*8);
291 decrypt_round(R0,R1,R2,R3,3*8);
292 decrypt_round(R2,R3,R0,R1,2*8);
293 decrypt_round(R0,R1,R2,R3,1*8);
294 decrypt_last_round(R2,R3,R0,R1,0);
295
296 input_whitening(%r10,%r11,a_offset)
297 movq %r10, (%rsi)
298
299 shl $32, R1
300 xor R0, R1
301
302 input_whitening(R1,%r11,c_offset)
303 movq R1, 8(%rsi)
304
305 popq R1
306 movl $1,%eax
307 RET
308 SYM_FUNC_END(twofish_dec_blk)
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