1 /* SPDX-License-Identifier: GPL-2.0-or-later *
2 /*
3 * Blowfish Cipher Algorithm (x86_64)
4 *
5 * Copyright (C) 2011 Jussi Kivilinna <jussi.ki
6 */
7
8 #include <linux/linkage.h>
9
10 .file "blowfish-x86_64-asm.S"
11 .text
12
13 /* structure of crypto context */
14 #define p 0
15 #define s0 ((16 + 2) * 4)
16 #define s1 ((16 + 2 + (1 * 256)) * 4)
17 #define s2 ((16 + 2 + (2 * 256)) * 4)
18 #define s3 ((16 + 2 + (3 * 256)) * 4)
19
20 /* register macros */
21 #define CTX %r12
22 #define RIO %rsi
23
24 #define RX0 %rax
25 #define RX1 %rbx
26 #define RX2 %rcx
27 #define RX3 %rdx
28
29 #define RX0d %eax
30 #define RX1d %ebx
31 #define RX2d %ecx
32 #define RX3d %edx
33
34 #define RX0bl %al
35 #define RX1bl %bl
36 #define RX2bl %cl
37 #define RX3bl %dl
38
39 #define RX0bh %ah
40 #define RX1bh %bh
41 #define RX2bh %ch
42 #define RX3bh %dh
43
44 #define RT0 %rdi
45 #define RT1 %rsi
46 #define RT2 %r8
47 #define RT3 %r9
48
49 #define RT0d %edi
50 #define RT1d %esi
51 #define RT2d %r8d
52 #define RT3d %r9d
53
54 #define RKEY %r10
55
56 /*********************************************
57 * 1-way blowfish
58 *********************************************
59 #define F() \
60 rorq $16, RX0; \
61 movzbl RX0bh, RT0d; \
62 movzbl RX0bl, RT1d; \
63 rolq $16, RX0; \
64 movl s0(CTX,RT0,4), RT0d; \
65 addl s1(CTX,RT1,4), RT0d; \
66 movzbl RX0bh, RT1d; \
67 movzbl RX0bl, RT2d; \
68 rolq $32, RX0; \
69 xorl s2(CTX,RT1,4), RT0d; \
70 addl s3(CTX,RT2,4), RT0d; \
71 xorq RT0, RX0;
72
73 #define add_roundkey_enc(n) \
74 xorq p+4*(n)(CTX), RX0;
75
76 #define round_enc(n) \
77 add_roundkey_enc(n); \
78 \
79 F(); \
80 F();
81
82 #define add_roundkey_dec(n) \
83 movq p+4*(n-1)(CTX), RT0; \
84 rorq $32, RT0; \
85 xorq RT0, RX0;
86
87 #define round_dec(n) \
88 add_roundkey_dec(n); \
89 \
90 F(); \
91 F(); \
92
93 #define read_block() \
94 movq (RIO), RX0; \
95 rorq $32, RX0; \
96 bswapq RX0;
97
98 #define write_block() \
99 bswapq RX0; \
100 movq RX0, (RIO);
101
102 SYM_FUNC_START(blowfish_enc_blk)
103 /* input:
104 * %rdi: ctx
105 * %rsi: dst
106 * %rdx: src
107 */
108 movq %r12, %r11;
109
110 movq %rdi, CTX;
111 movq %rsi, %r10;
112 movq %rdx, RIO;
113
114 read_block();
115
116 round_enc(0);
117 round_enc(2);
118 round_enc(4);
119 round_enc(6);
120 round_enc(8);
121 round_enc(10);
122 round_enc(12);
123 round_enc(14);
124 add_roundkey_enc(16);
125
126 movq %r11, %r12;
127 movq %r10, RIO;
128
129 write_block();
130 RET;
131 SYM_FUNC_END(blowfish_enc_blk)
132
133 SYM_FUNC_START(blowfish_dec_blk)
134 /* input:
135 * %rdi: ctx
136 * %rsi: dst
137 * %rdx: src
138 */
139 movq %r12, %r11;
140
141 movq %rdi, CTX;
142 movq %rsi, %r10;
143 movq %rdx, RIO;
144
145 read_block();
146
147 round_dec(17);
148 round_dec(15);
149 round_dec(13);
150 round_dec(11);
151 round_dec(9);
152 round_dec(7);
153 round_dec(5);
154 round_dec(3);
155 add_roundkey_dec(1);
156
157 movq %r10, RIO;
158 write_block();
159
160 movq %r11, %r12;
161
162 RET;
163 SYM_FUNC_END(blowfish_dec_blk)
164
165 /*********************************************
166 4-way blowfish, four blocks parallel
167 *********************************************
168
169 /* F() for 4-way. Slower when used alone/1-way
170 * parallel/4-way (tested on AMD Phenom II & I
171 */
172 #define F4(x) \
173 movzbl x ## bh, RT1d; \
174 movzbl x ## bl, RT3d; \
175 rorq $16, x; \
176 movzbl x ## bh, RT0d; \
177 movzbl x ## bl, RT2d; \
178 rorq $16, x; \
179 movl s0(CTX,RT0,4), RT0d; \
180 addl s1(CTX,RT2,4), RT0d; \
181 xorl s2(CTX,RT1,4), RT0d; \
182 addl s3(CTX,RT3,4), RT0d; \
183 xorq RT0, x;
184
185 #define add_preloaded_roundkey4() \
186 xorq RKEY, RX0; \
187 xorq RKEY, RX1; \
188 xorq RKEY, RX2; \
189 xorq RKEY, RX3;
190
191 #define preload_roundkey_enc(n) \
192 movq p+4*(n)(CTX), RKEY;
193
194 #define add_roundkey_enc4(n) \
195 add_preloaded_roundkey4(); \
196 preload_roundkey_enc(n + 2);
197
198 #define round_enc4(n) \
199 add_roundkey_enc4(n); \
200 \
201 F4(RX0); \
202 F4(RX1); \
203 F4(RX2); \
204 F4(RX3); \
205 \
206 F4(RX0); \
207 F4(RX1); \
208 F4(RX2); \
209 F4(RX3);
210
211 #define preload_roundkey_dec(n) \
212 movq p+4*((n)-1)(CTX), RKEY; \
213 rorq $32, RKEY;
214
215 #define add_roundkey_dec4(n) \
216 add_preloaded_roundkey4(); \
217 preload_roundkey_dec(n - 2);
218
219 #define round_dec4(n) \
220 add_roundkey_dec4(n); \
221 \
222 F4(RX0); \
223 F4(RX1); \
224 F4(RX2); \
225 F4(RX3); \
226 \
227 F4(RX0); \
228 F4(RX1); \
229 F4(RX2); \
230 F4(RX3);
231
232 #define read_block4() \
233 movq (RIO), RX0; \
234 rorq $32, RX0; \
235 bswapq RX0; \
236 \
237 movq 8(RIO), RX1; \
238 rorq $32, RX1; \
239 bswapq RX1; \
240 \
241 movq 16(RIO), RX2; \
242 rorq $32, RX2; \
243 bswapq RX2; \
244 \
245 movq 24(RIO), RX3; \
246 rorq $32, RX3; \
247 bswapq RX3;
248
249 #define write_block4() \
250 bswapq RX0; \
251 movq RX0, (RIO); \
252 \
253 bswapq RX1; \
254 movq RX1, 8(RIO); \
255 \
256 bswapq RX2; \
257 movq RX2, 16(RIO); \
258 \
259 bswapq RX3; \
260 movq RX3, 24(RIO);
261
262 #define xor_block4() \
263 movq (RIO), RT0; \
264 bswapq RT0; \
265 xorq RT0, RX1; \
266 \
267 movq 8(RIO), RT2; \
268 bswapq RT2; \
269 xorq RT2, RX2; \
270 \
271 movq 16(RIO), RT3; \
272 bswapq RT3; \
273 xorq RT3, RX3;
274
275 SYM_FUNC_START(blowfish_enc_blk_4way)
276 /* input:
277 * %rdi: ctx
278 * %rsi: dst
279 * %rdx: src
280 */
281 pushq %r12;
282 pushq %rbx;
283
284 movq %rdi, CTX
285 movq %rsi, %r11;
286 movq %rdx, RIO;
287
288 preload_roundkey_enc(0);
289
290 read_block4();
291
292 round_enc4(0);
293 round_enc4(2);
294 round_enc4(4);
295 round_enc4(6);
296 round_enc4(8);
297 round_enc4(10);
298 round_enc4(12);
299 round_enc4(14);
300 add_preloaded_roundkey4();
301
302 movq %r11, RIO;
303 write_block4();
304
305 popq %rbx;
306 popq %r12;
307 RET;
308 SYM_FUNC_END(blowfish_enc_blk_4way)
309
310 SYM_FUNC_START(__blowfish_dec_blk_4way)
311 /* input:
312 * %rdi: ctx
313 * %rsi: dst
314 * %rdx: src
315 * %rcx: cbc (bool)
316 */
317 pushq %r12;
318 pushq %rbx;
319 pushq %rcx;
320 pushq %rdx;
321
322 movq %rdi, CTX;
323 movq %rsi, %r11;
324 movq %rdx, RIO;
325
326 preload_roundkey_dec(17);
327 read_block4();
328
329 round_dec4(17);
330 round_dec4(15);
331 round_dec4(13);
332 round_dec4(11);
333 round_dec4(9);
334 round_dec4(7);
335 round_dec4(5);
336 round_dec4(3);
337 add_preloaded_roundkey4();
338
339 popq RIO;
340 popq %r12;
341 testq %r12, %r12;
342 jz .L_no_cbc_xor;
343
344 xor_block4();
345
346 .L_no_cbc_xor:
347 movq %r11, RIO;
348 write_block4();
349
350 popq %rbx;
351 popq %r12;
352
353 RET;
354 SYM_FUNC_END(__blowfish_dec_blk_4way)
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