tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * sha2-ce-core.S - core SHA-224/SHA-256 transform using v8 Crypto Extensions
3 *
4 * Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/linkage.h>
12#include <asm/assembler.h>
13
14 .text
15 .arch armv8-a+crypto
16
17 dga .req q20
18 dgav .req v20
19 dgb .req q21
20 dgbv .req v21
21
22 t0 .req v22
23 t1 .req v23
24
25 dg0q .req q24
26 dg0v .req v24
27 dg1q .req q25
28 dg1v .req v25
29 dg2q .req q26
30 dg2v .req v26
31
32 .macro add_only, ev, rc, s0
33 mov dg2v.16b, dg0v.16b
34 .ifeq \ev
35 add t1.4s, v\s0\().4s, \rc\().4s
36 sha256h dg0q, dg1q, t0.4s
37 sha256h2 dg1q, dg2q, t0.4s
38 .else
39 .ifnb \s0
40 add t0.4s, v\s0\().4s, \rc\().4s
41 .endif
42 sha256h dg0q, dg1q, t1.4s
43 sha256h2 dg1q, dg2q, t1.4s
44 .endif
45 .endm
46
47 .macro add_update, ev, rc, s0, s1, s2, s3
48 sha256su0 v\s0\().4s, v\s1\().4s
49 add_only \ev, \rc, \s1
50 sha256su1 v\s0\().4s, v\s2\().4s, v\s3\().4s
51 .endm
52
53 /*
54 * The SHA-256 round constants
55 */
56 .section ".rodata", "a"
57 .align 4
58.Lsha2_rcon:
59 .word 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5
60 .word 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5
61 .word 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3
62 .word 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174
63 .word 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc
64 .word 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da
65 .word 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7
66 .word 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967
67 .word 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13
68 .word 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85
69 .word 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3
70 .word 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070
71 .word 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5
72 .word 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3
73 .word 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208
74 .word 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
75
76 /*
77 * void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
78 * int blocks)
79 */
80 .text
81ENTRY(sha2_ce_transform)
82 /* load round constants */
83 adr_l x8, .Lsha2_rcon
84 ld1 { v0.4s- v3.4s}, [x8], #64
85 ld1 { v4.4s- v7.4s}, [x8], #64
86 ld1 { v8.4s-v11.4s}, [x8], #64
87 ld1 {v12.4s-v15.4s}, [x8]
88
89 /* load state */
90 ld1 {dgav.4s, dgbv.4s}, [x0]
91
92 /* load sha256_ce_state::finalize */
93 ldr_l w4, sha256_ce_offsetof_finalize, x4
94 ldr w4, [x0, x4]
95
96 /* load input */
970: ld1 {v16.4s-v19.4s}, [x1], #64
98 sub w2, w2, #1
99
100CPU_LE( rev32 v16.16b, v16.16b )
101CPU_LE( rev32 v17.16b, v17.16b )
102CPU_LE( rev32 v18.16b, v18.16b )
103CPU_LE( rev32 v19.16b, v19.16b )
104
1051: add t0.4s, v16.4s, v0.4s
106 mov dg0v.16b, dgav.16b
107 mov dg1v.16b, dgbv.16b
108
109 add_update 0, v1, 16, 17, 18, 19
110 add_update 1, v2, 17, 18, 19, 16
111 add_update 0, v3, 18, 19, 16, 17
112 add_update 1, v4, 19, 16, 17, 18
113
114 add_update 0, v5, 16, 17, 18, 19
115 add_update 1, v6, 17, 18, 19, 16
116 add_update 0, v7, 18, 19, 16, 17
117 add_update 1, v8, 19, 16, 17, 18
118
119 add_update 0, v9, 16, 17, 18, 19
120 add_update 1, v10, 17, 18, 19, 16
121 add_update 0, v11, 18, 19, 16, 17
122 add_update 1, v12, 19, 16, 17, 18
123
124 add_only 0, v13, 17
125 add_only 1, v14, 18
126 add_only 0, v15, 19
127 add_only 1
128
129 /* update state */
130 add dgav.4s, dgav.4s, dg0v.4s
131 add dgbv.4s, dgbv.4s, dg1v.4s
132
133 /* handled all input blocks? */
134 cbnz w2, 0b
135
136 /*
137 * Final block: add padding and total bit count.
138 * Skip if the input size was not a round multiple of the block size,
139 * the padding is handled by the C code in that case.
140 */
141 cbz x4, 3f
142 ldr_l w4, sha256_ce_offsetof_count, x4
143 ldr x4, [x0, x4]
144 movi v17.2d, #0
145 mov x8, #0x80000000
146 movi v18.2d, #0
147 ror x7, x4, #29 // ror(lsl(x4, 3), 32)
148 fmov d16, x8
149 mov x4, #0
150 mov v19.d[0], xzr
151 mov v19.d[1], x7
152 b 1b
153
154 /* store new state */
1553: st1 {dgav.4s, dgbv.4s}, [x0]
156 ret
157ENDPROC(sha2_ce_transform)