summaryrefslogtreecommitdiff
path: root/ext/libressl/crypto/modes/ghash-elf-armv4.S
blob: af42593de09836f873496883ddf50b740653e46f (plain)
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
#include "arm_arch.h"

.text
.syntax	unified
.code	32

.type	rem_4bit,%object
.align	5
rem_4bit:
.short	0x0000,0x1C20,0x3840,0x2460
.short	0x7080,0x6CA0,0x48C0,0x54E0
.short	0xE100,0xFD20,0xD940,0xC560
.short	0x9180,0x8DA0,0xA9C0,0xB5E0
.size	rem_4bit,.-rem_4bit

.type	rem_4bit_get,%function
rem_4bit_get:
	sub	r2,pc,#8
	sub	r2,r2,#32	@ &rem_4bit
	b	.Lrem_4bit_got
	nop
.size	rem_4bit_get,.-rem_4bit_get

.global	gcm_ghash_4bit
.type	gcm_ghash_4bit,%function
gcm_ghash_4bit:
	sub	r12,pc,#8
	add	r3,r2,r3		@ r3 to point at the end
	stmdb	sp!,{r3-r11,lr}		@ save r3/end too
	sub	r12,r12,#48		@ &rem_4bit

	ldmia	r12,{r4-r11}		@ copy rem_4bit ...
	stmdb	sp!,{r4-r11}		@ ... to stack

	ldrb	r12,[r2,#15]
	ldrb	r14,[r0,#15]
.Louter:
	eor	r12,r12,r14
	and	r14,r12,#0xf0
	and	r12,r12,#0x0f
	mov	r3,#14

	add	r7,r1,r12,lsl#4
	ldmia	r7,{r4-r7}	@ load Htbl[nlo]
	add	r11,r1,r14
	ldrb	r12,[r2,#14]

	and	r14,r4,#0xf		@ rem
	ldmia	r11,{r8-r11}	@ load Htbl[nhi]
	add	r14,r14,r14
	eor	r4,r8,r4,lsr#4
	ldrh	r8,[sp,r14]		@ rem_4bit[rem]
	eor	r4,r4,r5,lsl#28
	ldrb	r14,[r0,#14]
	eor	r5,r9,r5,lsr#4
	eor	r5,r5,r6,lsl#28
	eor	r6,r10,r6,lsr#4
	eor	r6,r6,r7,lsl#28
	eor	r7,r11,r7,lsr#4
	eor	r12,r12,r14
	and	r14,r12,#0xf0
	and	r12,r12,#0x0f
	eor	r7,r7,r8,lsl#16

.Linner:
	add	r11,r1,r12,lsl#4
	and	r12,r4,#0xf		@ rem
	subs	r3,r3,#1
	add	r12,r12,r12
	ldmia	r11,{r8-r11}	@ load Htbl[nlo]
	eor	r4,r8,r4,lsr#4
	eor	r4,r4,r5,lsl#28
	eor	r5,r9,r5,lsr#4
	eor	r5,r5,r6,lsl#28
	ldrh	r8,[sp,r12]		@ rem_4bit[rem]
	eor	r6,r10,r6,lsr#4
	ldrbpl	r12,[r2,r3]
	eor	r6,r6,r7,lsl#28
	eor	r7,r11,r7,lsr#4

	add	r11,r1,r14
	and	r14,r4,#0xf		@ rem
	eor	r7,r7,r8,lsl#16	@ ^= rem_4bit[rem]
	add	r14,r14,r14
	ldmia	r11,{r8-r11}	@ load Htbl[nhi]
	eor	r4,r8,r4,lsr#4
	ldrbpl	r8,[r0,r3]
	eor	r4,r4,r5,lsl#28
	eor	r5,r9,r5,lsr#4
	ldrh	r9,[sp,r14]
	eor	r5,r5,r6,lsl#28
	eor	r6,r10,r6,lsr#4
	eor	r6,r6,r7,lsl#28
	eorpl	r12,r12,r8
	eor	r7,r11,r7,lsr#4
	andpl	r14,r12,#0xf0
	andpl	r12,r12,#0x0f
	eor	r7,r7,r9,lsl#16	@ ^= rem_4bit[rem]
	bpl	.Linner

	ldr	r3,[sp,#32]		@ re-load r3/end
	add	r2,r2,#16
	mov	r14,r4
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
	rev	r4,r4
	str	r4,[r0,#12]
#elif defined(__ARMEB__)
	str	r4,[r0,#12]
#else
	mov	r9,r4,lsr#8
	strb	r4,[r0,#12+3]
	mov	r10,r4,lsr#16
	strb	r9,[r0,#12+2]
	mov	r11,r4,lsr#24
	strb	r10,[r0,#12+1]
	strb	r11,[r0,#12]
#endif
	cmp	r2,r3
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
	rev	r5,r5
	str	r5,[r0,#8]
#elif defined(__ARMEB__)
	str	r5,[r0,#8]
#else
	mov	r9,r5,lsr#8
	strb	r5,[r0,#8+3]
	mov	r10,r5,lsr#16
	strb	r9,[r0,#8+2]
	mov	r11,r5,lsr#24
	strb	r10,[r0,#8+1]
	strb	r11,[r0,#8]
#endif
	ldrbne	r12,[r2,#15]
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
	rev	r6,r6
	str	r6,[r0,#4]
#elif defined(__ARMEB__)
	str	r6,[r0,#4]
#else
	mov	r9,r6,lsr#8
	strb	r6,[r0,#4+3]
	mov	r10,r6,lsr#16
	strb	r9,[r0,#4+2]
	mov	r11,r6,lsr#24
	strb	r10,[r0,#4+1]
	strb	r11,[r0,#4]
#endif
	
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
	rev	r7,r7
	str	r7,[r0,#0]
#elif defined(__ARMEB__)
	str	r7,[r0,#0]
#else
	mov	r9,r7,lsr#8
	strb	r7,[r0,#0+3]
	mov	r10,r7,lsr#16
	strb	r9,[r0,#0+2]
	mov	r11,r7,lsr#24
	strb	r10,[r0,#0+1]
	strb	r11,[r0,#0]
#endif
	
	bne	.Louter

	add	sp,sp,#36
#if __ARM_ARCH__>=5
	ldmia	sp!,{r4-r11,pc}
#else
	ldmia	sp!,{r4-r11,lr}
	tst	lr,#1
	moveq	pc,lr			@ be binary compatible with V4, yet
	.word	0xe12fff1e			@ interoperable with Thumb ISA:-)
#endif
.size	gcm_ghash_4bit,.-gcm_ghash_4bit

.global	gcm_gmult_4bit
.type	gcm_gmult_4bit,%function
gcm_gmult_4bit:
	stmdb	sp!,{r4-r11,lr}
	ldrb	r12,[r0,#15]
	b	rem_4bit_get
.Lrem_4bit_got:
	and	r14,r12,#0xf0
	and	r12,r12,#0x0f
	mov	r3,#14

	add	r7,r1,r12,lsl#4
	ldmia	r7,{r4-r7}	@ load Htbl[nlo]
	ldrb	r12,[r0,#14]

	add	r11,r1,r14
	and	r14,r4,#0xf		@ rem
	ldmia	r11,{r8-r11}	@ load Htbl[nhi]
	add	r14,r14,r14
	eor	r4,r8,r4,lsr#4
	ldrh	r8,[r2,r14]	@ rem_4bit[rem]
	eor	r4,r4,r5,lsl#28
	eor	r5,r9,r5,lsr#4
	eor	r5,r5,r6,lsl#28
	eor	r6,r10,r6,lsr#4
	eor	r6,r6,r7,lsl#28
	eor	r7,r11,r7,lsr#4
	and	r14,r12,#0xf0
	eor	r7,r7,r8,lsl#16
	and	r12,r12,#0x0f

.Loop:
	add	r11,r1,r12,lsl#4
	and	r12,r4,#0xf		@ rem
	subs	r3,r3,#1
	add	r12,r12,r12
	ldmia	r11,{r8-r11}	@ load Htbl[nlo]
	eor	r4,r8,r4,lsr#4
	eor	r4,r4,r5,lsl#28
	eor	r5,r9,r5,lsr#4
	eor	r5,r5,r6,lsl#28
	ldrh	r8,[r2,r12]	@ rem_4bit[rem]
	eor	r6,r10,r6,lsr#4
	ldrbpl	r12,[r0,r3]
	eor	r6,r6,r7,lsl#28
	eor	r7,r11,r7,lsr#4

	add	r11,r1,r14
	and	r14,r4,#0xf		@ rem
	eor	r7,r7,r8,lsl#16	@ ^= rem_4bit[rem]
	add	r14,r14,r14
	ldmia	r11,{r8-r11}	@ load Htbl[nhi]
	eor	r4,r8,r4,lsr#4
	eor	r4,r4,r5,lsl#28
	eor	r5,r9,r5,lsr#4
	ldrh	r8,[r2,r14]	@ rem_4bit[rem]
	eor	r5,r5,r6,lsl#28
	eor	r6,r10,r6,lsr#4
	eor	r6,r6,r7,lsl#28
	eor	r7,r11,r7,lsr#4
	andpl	r14,r12,#0xf0
	andpl	r12,r12,#0x0f
	eor	r7,r7,r8,lsl#16	@ ^= rem_4bit[rem]
	bpl	.Loop
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
	rev	r4,r4
	str	r4,[r0,#12]
#elif defined(__ARMEB__)
	str	r4,[r0,#12]
#else
	mov	r9,r4,lsr#8
	strb	r4,[r0,#12+3]
	mov	r10,r4,lsr#16
	strb	r9,[r0,#12+2]
	mov	r11,r4,lsr#24
	strb	r10,[r0,#12+1]
	strb	r11,[r0,#12]
#endif
	
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
	rev	r5,r5
	str	r5,[r0,#8]
#elif defined(__ARMEB__)
	str	r5,[r0,#8]
#else
	mov	r9,r5,lsr#8
	strb	r5,[r0,#8+3]
	mov	r10,r5,lsr#16
	strb	r9,[r0,#8+2]
	mov	r11,r5,lsr#24
	strb	r10,[r0,#8+1]
	strb	r11,[r0,#8]
#endif
	
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
	rev	r6,r6
	str	r6,[r0,#4]
#elif defined(__ARMEB__)
	str	r6,[r0,#4]
#else
	mov	r9,r6,lsr#8
	strb	r6,[r0,#4+3]
	mov	r10,r6,lsr#16
	strb	r9,[r0,#4+2]
	mov	r11,r6,lsr#24
	strb	r10,[r0,#4+1]
	strb	r11,[r0,#4]
#endif
	
#if __ARM_ARCH__>=7 && defined(__ARMEL__)
	rev	r7,r7
	str	r7,[r0,#0]
#elif defined(__ARMEB__)
	str	r7,[r0,#0]
#else
	mov	r9,r7,lsr#8
	strb	r7,[r0,#0+3]
	mov	r10,r7,lsr#16
	strb	r9,[r0,#0+2]
	mov	r11,r7,lsr#24
	strb	r10,[r0,#0+1]
	strb	r11,[r0,#0]
#endif
	
#if __ARM_ARCH__>=5
	ldmia	sp!,{r4-r11,pc}
#else
	ldmia	sp!,{r4-r11,lr}
	tst	lr,#1
	moveq	pc,lr			@ be binary compatible with V4, yet
	.word	0xe12fff1e			@ interoperable with Thumb ISA:-)
#endif
.size	gcm_gmult_4bit,.-gcm_gmult_4bit
#if __ARM_ARCH__>=7 && !defined(__STRICT_ALIGNMENT)
.fpu	neon

.global	gcm_gmult_neon
.type	gcm_gmult_neon,%function
.align	4
gcm_gmult_neon:
	sub		r1,#16		@ point at H in GCM128_CTX
	vld1.64		d29,[r0,:64]!@ load Xi
	vmov.i32	d5,#0xe1		@ our irreducible polynomial
	vld1.64		d28,[r0,:64]!
	vshr.u64	d5,#32
	vldmia		r1,{d0-d1}	@ load H
	veor		q12,q12
#ifdef __ARMEL__
	vrev64.8	q14,q14
#endif
	veor		q13,q13
	veor		q11,q11
	mov		r1,#16
	veor		q10,q10
	mov		r3,#16
	veor		d2,d2
	vdup.8		d4,d28[0]	@ broadcast lowest byte
	b		.Linner_neon
.size	gcm_gmult_neon,.-gcm_gmult_neon

.global	gcm_ghash_neon
.type	gcm_ghash_neon,%function
.align	4
gcm_ghash_neon:
	vld1.64		d21,[r0,:64]!	@ load Xi
	vmov.i32	d5,#0xe1		@ our irreducible polynomial
	vld1.64		d20,[r0,:64]!
	vshr.u64	d5,#32
	vldmia		r0,{d0-d1}		@ load H
	veor		q12,q12
	nop
#ifdef __ARMEL__
	vrev64.8	q10,q10
#endif
.Louter_neon:
	vld1.64		d29,[r2]!	@ load inp
	veor		q13,q13
	vld1.64		d28,[r2]!
	veor		q11,q11
	mov		r1,#16
#ifdef __ARMEL__
	vrev64.8	q14,q14
#endif
	veor		d2,d2
	veor		q14,q10			@ inp^=Xi
	veor		q10,q10
	vdup.8		d4,d28[0]	@ broadcast lowest byte
.Linner_neon:
	subs		r1,r1,#1
	vmull.p8	q9,d1,d4		@ H.lo·Xi[i]
	vmull.p8	q8,d0,d4		@ H.hi·Xi[i]
	vext.8		q14,q12,#1		@ IN>>=8

	veor		q10,q13		@ modulo-scheduled part
	vshl.i64	d22,#48
	vdup.8		d4,d28[0]	@ broadcast lowest byte
	veor		d3,d18,d20

	veor		d21,d22
	vuzp.8		q9,q8
	vsli.8		d2,d3,#1		@ compose the "carry" byte
	vext.8		q10,q12,#1		@ Z>>=8

	vmull.p8	q11,d2,d5		@ "carry"·0xe1
	vshr.u8		d2,d3,#7		@ save Z's bottom bit
	vext.8		q13,q9,q12,#1	@ Qlo>>=8
	veor		q10,q8
	bne		.Linner_neon

	veor		q10,q13		@ modulo-scheduled artefact
	vshl.i64	d22,#48
	veor		d21,d22

	@ finalization, normalize Z:Zo
	vand		d2,d5		@ suffices to mask the bit
	vshr.u64	d3,d20,#63
	vshl.i64	q10,#1
	subs		r3,#16
	vorr		q10,q1		@ Z=Z:Zo<<1
	bne		.Louter_neon

#ifdef __ARMEL__
	vrev64.8	q10,q10
#endif
	sub		r0,#16	
	vst1.64		d21,[r0,:64]!	@ write out Xi
	vst1.64		d20,[r0,:64]

	.word	0xe12fff1e
.size	gcm_ghash_neon,.-gcm_ghash_neon
#endif
.asciz  "GHASH for ARMv4/NEON, CRYPTOGAMS by <appro@openssl.org>"
.align  2
#if defined(HAVE_GNU_STACK)
.section .note.GNU-stack,"",%progbits
#endif