xref: /openbmc/linux/arch/x86/crypto/sha1_ssse3_asm.S (revision e7253313) 
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * This is a SIMD SHA-1 implementation. It requires the Intel(R) Supplemental
4 * SSE3 instruction set extensions introduced in Intel Core Microarchitecture
5 * processors. CPUs supporting Intel(R) AVX extensions will get an additional
6 * boost.
7 *
8 * This work was inspired by the vectorized implementation of Dean Gaudet.
9 * Additional information on it can be found at:
10 *    http://www.arctic.org/~dean/crypto/sha1.html
11 *
12 * It was improved upon with more efficient vectorization of the message
13 * scheduling. This implementation has also been optimized for all current and
14 * several future generations of Intel CPUs.
15 *
16 * See this article for more information about the implementation details:
17 *   http://software.intel.com/en-us/articles/improving-the-performance-of-the-secure-hash-algorithm-1/
18 *
19 * Copyright (C) 2010, Intel Corp.
20 *   Authors: Maxim Locktyukhin <maxim.locktyukhin@intel.com>
21 *            Ronen Zohar <ronen.zohar@intel.com>
22 *
23 * Converted to AT&T syntax and adapted for inclusion in the Linux kernel:
24 *   Author: Mathias Krause <minipli@googlemail.com>
25 */
26
27#include <linux/linkage.h>
28
29#define CTX	%rdi	// arg1
30#define BUF	%rsi	// arg2
31#define CNT	%rdx	// arg3
32
33#define REG_A	%ecx
34#define REG_B	%esi
35#define REG_C	%edi
36#define REG_D	%r12d
37#define REG_E	%edx
38
39#define REG_T1	%eax
40#define REG_T2	%ebx
41
42#define K_BASE		%r8
43#define HASH_PTR	%r9
44#define BUFFER_PTR	%r10
45#define BUFFER_END	%r11
46
47#define W_TMP1	%xmm0
48#define W_TMP2	%xmm9
49
50#define W0	%xmm1
51#define W4	%xmm2
52#define W8	%xmm3
53#define W12	%xmm4
54#define W16	%xmm5
55#define W20	%xmm6
56#define W24	%xmm7
57#define W28	%xmm8
58
59#define XMM_SHUFB_BSWAP	%xmm10
60
61/* we keep window of 64 w[i]+K pre-calculated values in a circular buffer */
62#define WK(t)	(((t) & 15) * 4)(%rsp)
63#define W_PRECALC_AHEAD	16
64
65/*
66 * This macro implements the SHA-1 function's body for single 64-byte block
67 * param: function's name
68 */
69.macro SHA1_VECTOR_ASM  name
70	SYM_FUNC_START(\name)
71
72	push	%rbx
73	push	%r12
74	push	%rbp
75	mov	%rsp, %rbp
76
77	sub	$64, %rsp		# allocate workspace
78	and	$~15, %rsp		# align stack
79
80	mov	CTX, HASH_PTR
81	mov	BUF, BUFFER_PTR
82
83	shl	$6, CNT			# multiply by 64
84	add	BUF, CNT
85	mov	CNT, BUFFER_END
86
87	lea	K_XMM_AR(%rip), K_BASE
88	xmm_mov	BSWAP_SHUFB_CTL(%rip), XMM_SHUFB_BSWAP
89
90	SHA1_PIPELINED_MAIN_BODY
91
92	# cleanup workspace
93	mov	$8, %ecx
94	mov	%rsp, %rdi
95	xor	%eax, %eax
96	rep stosq
97
98	mov	%rbp, %rsp		# deallocate workspace
99	pop	%rbp
100	pop	%r12
101	pop	%rbx
102	ret
103
104	SYM_FUNC_END(\name)
105.endm
106
107/*
108 * This macro implements 80 rounds of SHA-1 for one 64-byte block
109 */
110.macro SHA1_PIPELINED_MAIN_BODY
111	INIT_REGALLOC
112
113	mov	  (HASH_PTR), A
114	mov	 4(HASH_PTR), B
115	mov	 8(HASH_PTR), C
116	mov	12(HASH_PTR), D
117	mov	16(HASH_PTR), E
118
119  .set i, 0
120  .rept W_PRECALC_AHEAD
121	W_PRECALC i
122    .set i, (i+1)
123  .endr
124
125.align 4
1261:
127	RR F1,A,B,C,D,E,0
128	RR F1,D,E,A,B,C,2
129	RR F1,B,C,D,E,A,4
130	RR F1,E,A,B,C,D,6
131	RR F1,C,D,E,A,B,8
132
133	RR F1,A,B,C,D,E,10
134	RR F1,D,E,A,B,C,12
135	RR F1,B,C,D,E,A,14
136	RR F1,E,A,B,C,D,16
137	RR F1,C,D,E,A,B,18
138
139	RR F2,A,B,C,D,E,20
140	RR F2,D,E,A,B,C,22
141	RR F2,B,C,D,E,A,24
142	RR F2,E,A,B,C,D,26
143	RR F2,C,D,E,A,B,28
144
145	RR F2,A,B,C,D,E,30
146	RR F2,D,E,A,B,C,32
147	RR F2,B,C,D,E,A,34
148	RR F2,E,A,B,C,D,36
149	RR F2,C,D,E,A,B,38
150
151	RR F3,A,B,C,D,E,40
152	RR F3,D,E,A,B,C,42
153	RR F3,B,C,D,E,A,44
154	RR F3,E,A,B,C,D,46
155	RR F3,C,D,E,A,B,48
156
157	RR F3,A,B,C,D,E,50
158	RR F3,D,E,A,B,C,52
159	RR F3,B,C,D,E,A,54
160	RR F3,E,A,B,C,D,56
161	RR F3,C,D,E,A,B,58
162
163	add	$64, BUFFER_PTR		# move to the next 64-byte block
164	cmp	BUFFER_END, BUFFER_PTR	# if the current is the last one use
165	cmovae	K_BASE, BUFFER_PTR	# dummy source to avoid buffer overrun
166
167	RR F4,A,B,C,D,E,60
168	RR F4,D,E,A,B,C,62
169	RR F4,B,C,D,E,A,64
170	RR F4,E,A,B,C,D,66
171	RR F4,C,D,E,A,B,68
172
173	RR F4,A,B,C,D,E,70
174	RR F4,D,E,A,B,C,72
175	RR F4,B,C,D,E,A,74
176	RR F4,E,A,B,C,D,76
177	RR F4,C,D,E,A,B,78
178
179	UPDATE_HASH   (HASH_PTR), A
180	UPDATE_HASH  4(HASH_PTR), B
181	UPDATE_HASH  8(HASH_PTR), C
182	UPDATE_HASH 12(HASH_PTR), D
183	UPDATE_HASH 16(HASH_PTR), E
184
185	RESTORE_RENAMED_REGS
186	cmp	K_BASE, BUFFER_PTR	# K_BASE means, we reached the end
187	jne	1b
188.endm
189
190.macro INIT_REGALLOC
191  .set A, REG_A
192  .set B, REG_B
193  .set C, REG_C
194  .set D, REG_D
195  .set E, REG_E
196  .set T1, REG_T1
197  .set T2, REG_T2
198.endm
199
200.macro RESTORE_RENAMED_REGS
201	# order is important (REG_C is where it should be)
202	mov	B, REG_B
203	mov	D, REG_D
204	mov	A, REG_A
205	mov	E, REG_E
206.endm
207
208.macro SWAP_REG_NAMES  a, b
209  .set _T, \a
210  .set \a, \b
211  .set \b, _T
212.endm
213
214.macro F1  b, c, d
215	mov	\c, T1
216	SWAP_REG_NAMES \c, T1
217	xor	\d, T1
218	and	\b, T1
219	xor	\d, T1
220.endm
221
222.macro F2  b, c, d
223	mov	\d, T1
224	SWAP_REG_NAMES \d, T1
225	xor	\c, T1
226	xor	\b, T1
227.endm
228
229.macro F3  b, c ,d
230	mov	\c, T1
231	SWAP_REG_NAMES \c, T1
232	mov	\b, T2
233	or	\b, T1
234	and	\c, T2
235	and	\d, T1
236	or	T2, T1
237.endm
238
239.macro F4  b, c, d
240	F2 \b, \c, \d
241.endm
242
243.macro UPDATE_HASH  hash, val
244	add	\hash, \val
245	mov	\val, \hash
246.endm
247
248/*
249 * RR does two rounds of SHA-1 back to back with W[] pre-calc
250 *   t1 = F(b, c, d);   e += w(i)
251 *   e += t1;           b <<= 30;   d  += w(i+1);
252 *   t1 = F(a, b, c);
253 *   d += t1;           a <<= 5;
254 *   e += a;
255 *   t1 = e;            a >>= 7;
256 *   t1 <<= 5;
257 *   d += t1;
258 */
259.macro RR  F, a, b, c, d, e, round
260	add	WK(\round), \e
261	\F   \b, \c, \d		# t1 = F(b, c, d);
262	W_PRECALC (\round + W_PRECALC_AHEAD)
263	rol	$30, \b
264	add	T1, \e
265	add	WK(\round + 1), \d
266
267	\F   \a, \b, \c
268	W_PRECALC (\round + W_PRECALC_AHEAD + 1)
269	rol	$5, \a
270	add	\a, \e
271	add	T1, \d
272	ror	$7, \a		# (a <<r 5) >>r 7) => a <<r 30)
273
274	mov	\e, T1
275	SWAP_REG_NAMES \e, T1
276
277	rol	$5, T1
278	add	T1, \d
279
280	# write:  \a, \b
281	# rotate: \a<=\d, \b<=\e, \c<=\a, \d<=\b, \e<=\c
282.endm
283
284.macro W_PRECALC  r
285  .set i, \r
286
287  .if (i < 20)
288    .set K_XMM, 0
289  .elseif (i < 40)
290    .set K_XMM, 16
291  .elseif (i < 60)
292    .set K_XMM, 32
293  .elseif (i < 80)
294    .set K_XMM, 48
295  .endif
296
297  .if ((i < 16) || ((i >= 80) && (i < (80 + W_PRECALC_AHEAD))))
298    .set i, ((\r) % 80)	    # pre-compute for the next iteration
299    .if (i == 0)
300	W_PRECALC_RESET
301    .endif
302	W_PRECALC_00_15
303  .elseif (i<32)
304	W_PRECALC_16_31
305  .elseif (i < 80)   // rounds 32-79
306	W_PRECALC_32_79
307  .endif
308.endm
309
310.macro W_PRECALC_RESET
311  .set W,          W0
312  .set W_minus_04, W4
313  .set W_minus_08, W8
314  .set W_minus_12, W12
315  .set W_minus_16, W16
316  .set W_minus_20, W20
317  .set W_minus_24, W24
318  .set W_minus_28, W28
319  .set W_minus_32, W
320.endm
321
322.macro W_PRECALC_ROTATE
323  .set W_minus_32, W_minus_28
324  .set W_minus_28, W_minus_24
325  .set W_minus_24, W_minus_20
326  .set W_minus_20, W_minus_16
327  .set W_minus_16, W_minus_12
328  .set W_minus_12, W_minus_08
329  .set W_minus_08, W_minus_04
330  .set W_minus_04, W
331  .set W,          W_minus_32
332.endm
333
334.macro W_PRECALC_SSSE3
335
336.macro W_PRECALC_00_15
337	W_PRECALC_00_15_SSSE3
338.endm
339.macro W_PRECALC_16_31
340	W_PRECALC_16_31_SSSE3
341.endm
342.macro W_PRECALC_32_79
343	W_PRECALC_32_79_SSSE3
344.endm
345
346/* message scheduling pre-compute for rounds 0-15 */
347.macro W_PRECALC_00_15_SSSE3
348  .if ((i & 3) == 0)
349	movdqu	(i*4)(BUFFER_PTR), W_TMP1
350  .elseif ((i & 3) == 1)
351	pshufb	XMM_SHUFB_BSWAP, W_TMP1
352	movdqa	W_TMP1, W
353  .elseif ((i & 3) == 2)
354	paddd	(K_BASE), W_TMP1
355  .elseif ((i & 3) == 3)
356	movdqa  W_TMP1, WK(i&~3)
357	W_PRECALC_ROTATE
358  .endif
359.endm
360
361/* message scheduling pre-compute for rounds 16-31
362 *
363 * - calculating last 32 w[i] values in 8 XMM registers
364 * - pre-calculate K+w[i] values and store to mem, for later load by ALU add
365 *   instruction
366 *
367 * some "heavy-lifting" vectorization for rounds 16-31 due to w[i]->w[i-3]
368 * dependency, but improves for 32-79
369 */
370.macro W_PRECALC_16_31_SSSE3
371  # blended scheduling of vector and scalar instruction streams, one 4-wide
372  # vector iteration / 4 scalar rounds
373  .if ((i & 3) == 0)
374	movdqa	W_minus_12, W
375	palignr	$8, W_minus_16, W	# w[i-14]
376	movdqa	W_minus_04, W_TMP1
377	psrldq	$4, W_TMP1		# w[i-3]
378	pxor	W_minus_08, W
379  .elseif ((i & 3) == 1)
380	pxor	W_minus_16, W_TMP1
381	pxor	W_TMP1, W
382	movdqa	W, W_TMP2
383	movdqa	W, W_TMP1
384	pslldq	$12, W_TMP2
385  .elseif ((i & 3) == 2)
386	psrld	$31, W
387	pslld	$1, W_TMP1
388	por	W, W_TMP1
389	movdqa	W_TMP2, W
390	psrld	$30, W_TMP2
391	pslld	$2, W
392  .elseif ((i & 3) == 3)
393	pxor	W, W_TMP1
394	pxor	W_TMP2, W_TMP1
395	movdqa	W_TMP1, W
396	paddd	K_XMM(K_BASE), W_TMP1
397	movdqa	W_TMP1, WK(i&~3)
398	W_PRECALC_ROTATE
399  .endif
400.endm
401
402/* message scheduling pre-compute for rounds 32-79
403 *
404 * in SHA-1 specification: w[i] = (w[i-3] ^ w[i-8]  ^ w[i-14] ^ w[i-16]) rol 1
405 * instead we do equal:    w[i] = (w[i-6] ^ w[i-16] ^ w[i-28] ^ w[i-32]) rol 2
406 * allows more efficient vectorization since w[i]=>w[i-3] dependency is broken
407 */
408.macro W_PRECALC_32_79_SSSE3
409  .if ((i & 3) == 0)
410	movdqa	W_minus_04, W_TMP1
411	pxor	W_minus_28, W		# W is W_minus_32 before xor
412	palignr	$8, W_minus_08, W_TMP1
413  .elseif ((i & 3) == 1)
414	pxor	W_minus_16, W
415	pxor	W_TMP1, W
416	movdqa	W, W_TMP1
417  .elseif ((i & 3) == 2)
418	psrld	$30, W
419	pslld	$2, W_TMP1
420	por	W, W_TMP1
421  .elseif ((i & 3) == 3)
422	movdqa	W_TMP1, W
423	paddd	K_XMM(K_BASE), W_TMP1
424	movdqa	W_TMP1, WK(i&~3)
425	W_PRECALC_ROTATE
426  .endif
427.endm
428
429.endm		// W_PRECALC_SSSE3
430
431
432#define K1	0x5a827999
433#define K2	0x6ed9eba1
434#define K3	0x8f1bbcdc
435#define K4	0xca62c1d6
436
437.section .rodata
438.align 16
439
440K_XMM_AR:
441	.long K1, K1, K1, K1
442	.long K2, K2, K2, K2
443	.long K3, K3, K3, K3
444	.long K4, K4, K4, K4
445
446BSWAP_SHUFB_CTL:
447	.long 0x00010203
448	.long 0x04050607
449	.long 0x08090a0b
450	.long 0x0c0d0e0f
451
452
453.section .text
454
455W_PRECALC_SSSE3
456.macro xmm_mov a, b
457	movdqu	\a,\b
458.endm
459
460/* SSSE3 optimized implementation:
461 *  extern "C" void sha1_transform_ssse3(u32 *digest, const char *data, u32 *ws,
462 *                                       unsigned int rounds);
463 */
464SHA1_VECTOR_ASM     sha1_transform_ssse3
465
466#ifdef CONFIG_AS_AVX
467
468.macro W_PRECALC_AVX
469
470.purgem W_PRECALC_00_15
471.macro  W_PRECALC_00_15
472    W_PRECALC_00_15_AVX
473.endm
474.purgem W_PRECALC_16_31
475.macro  W_PRECALC_16_31
476    W_PRECALC_16_31_AVX
477.endm
478.purgem W_PRECALC_32_79
479.macro  W_PRECALC_32_79
480    W_PRECALC_32_79_AVX
481.endm
482
483.macro W_PRECALC_00_15_AVX
484  .if ((i & 3) == 0)
485	vmovdqu	(i*4)(BUFFER_PTR), W_TMP1
486  .elseif ((i & 3) == 1)
487	vpshufb	XMM_SHUFB_BSWAP, W_TMP1, W
488  .elseif ((i & 3) == 2)
489	vpaddd	(K_BASE), W, W_TMP1
490  .elseif ((i & 3) == 3)
491	vmovdqa	W_TMP1, WK(i&~3)
492	W_PRECALC_ROTATE
493  .endif
494.endm
495
496.macro W_PRECALC_16_31_AVX
497  .if ((i & 3) == 0)
498	vpalignr $8, W_minus_16, W_minus_12, W	# w[i-14]
499	vpsrldq	$4, W_minus_04, W_TMP1		# w[i-3]
500	vpxor	W_minus_08, W, W
501	vpxor	W_minus_16, W_TMP1, W_TMP1
502  .elseif ((i & 3) == 1)
503	vpxor	W_TMP1, W, W
504	vpslldq	$12, W, W_TMP2
505	vpslld	$1, W, W_TMP1
506  .elseif ((i & 3) == 2)
507	vpsrld	$31, W, W
508	vpor	W, W_TMP1, W_TMP1
509	vpslld	$2, W_TMP2, W
510	vpsrld	$30, W_TMP2, W_TMP2
511  .elseif ((i & 3) == 3)
512	vpxor	W, W_TMP1, W_TMP1
513	vpxor	W_TMP2, W_TMP1, W
514	vpaddd	K_XMM(K_BASE), W, W_TMP1
515	vmovdqu	W_TMP1, WK(i&~3)
516	W_PRECALC_ROTATE
517  .endif
518.endm
519
520.macro W_PRECALC_32_79_AVX
521  .if ((i & 3) == 0)
522	vpalignr $8, W_minus_08, W_minus_04, W_TMP1
523	vpxor	W_minus_28, W, W		# W is W_minus_32 before xor
524  .elseif ((i & 3) == 1)
525	vpxor	W_minus_16, W_TMP1, W_TMP1
526	vpxor	W_TMP1, W, W
527  .elseif ((i & 3) == 2)
528	vpslld	$2, W, W_TMP1
529	vpsrld	$30, W, W
530	vpor	W, W_TMP1, W
531  .elseif ((i & 3) == 3)
532	vpaddd	K_XMM(K_BASE), W, W_TMP1
533	vmovdqu	W_TMP1, WK(i&~3)
534	W_PRECALC_ROTATE
535  .endif
536.endm
537
538.endm    // W_PRECALC_AVX
539
540W_PRECALC_AVX
541.purgem xmm_mov
542.macro xmm_mov a, b
543	vmovdqu	\a,\b
544.endm
545
546
547/* AVX optimized implementation:
548 *  extern "C" void sha1_transform_avx(u32 *digest, const char *data, u32 *ws,
549 *                                     unsigned int rounds);
550 */
551SHA1_VECTOR_ASM     sha1_transform_avx
552
553#endif
554