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/*
* sha1-ce-core.S - SHA-1 secure hash using ARMv8 Crypto Extensions
*
* Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
.text
.arch armv8-a+crypto
k0 .req v0
k1 .req v1
k2 .req v2
k3 .req v3
t0 .req v4
t1 .req v5
dga .req q6
dgav .req v6
dgb .req s7
dgbv .req v7
dg0q .req q12
dg0s .req s12
dg0v .req v12
dg1s .req s13
dg1v .req v13
dg2s .req s14
.macro add_only, op, ev, rc, s0, dg1
.ifc \ev, ev
add t1.4s, v\s0\().4s, \rc\().4s
sha1h dg2s, dg0s
.ifnb \dg1
sha1\op dg0q, \dg1, t0.4s
.else
sha1\op dg0q, dg1s, t0.4s
.endif
.else
.ifnb \s0
add t0.4s, v\s0\().4s, \rc\().4s
.endif
sha1h dg1s, dg0s
sha1\op dg0q, dg2s, t1.4s
.endif
.endm
.macro add_update, op, ev, rc, s0, s1, s2, s3, dg1
sha1su0 v\s0\().4s, v\s1\().4s, v\s2\().4s
add_only \op, \ev, \rc, \s1, \dg1
sha1su1 v\s0\().4s, v\s3\().4s
.endm
/*
* The SHA1 round constants
*/
.align 4
.Lsha1_rcon:
.word 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6
/*
* void sha1_ce_transform(int blocks, u8 const *src, u32 *state,
* u8 *head, long bytes)
*/
ENTRY(sha1_ce_transform)
/* load round constants */
adr x6, .Lsha1_rcon
ld1r {k0.4s}, [x6], #4
ld1r {k1.4s}, [x6], #4
ld1r {k2.4s}, [x6], #4
ld1r {k3.4s}, [x6]
/* load state */
ldr dga, [x2]
ldr dgb, [x2, #16]
/* load partial state (if supplied) */
cbz x3, 0f
ld1 {v8.4s-v11.4s}, [x3]
b 1f
/* load input */
0: ld1 {v8.4s-v11.4s}, [x1], #64
sub w0, w0, #1
1:
CPU_LE( rev32 v8.16b, v8.16b )
CPU_LE( rev32 v9.16b, v9.16b )
CPU_LE( rev32 v10.16b, v10.16b )
CPU_LE( rev32 v11.16b, v11.16b )
2: add t0.4s, v8.4s, k0.4s
mov dg0v.16b, dgav.16b
add_update c, ev, k0, 8, 9, 10, 11, dgb
add_update c, od, k0, 9, 10, 11, 8
add_update c, ev, k0, 10, 11, 8, 9
add_update c, od, k0, 11, 8, 9, 10
add_update c, ev, k1, 8, 9, 10, 11
add_update p, od, k1, 9, 10, 11, 8
add_update p, ev, k1, 10, 11, 8, 9
add_update p, od, k1, 11, 8, 9, 10
add_update p, ev, k1, 8, 9, 10, 11
add_update p, od, k2, 9, 10, 11, 8
add_update m, ev, k2, 10, 11, 8, 9
add_update m, od, k2, 11, 8, 9, 10
add_update m, ev, k2, 8, 9, 10, 11
add_update m, od, k2, 9, 10, 11, 8
add_update m, ev, k3, 10, 11, 8, 9
add_update p, od, k3, 11, 8, 9, 10
add_only p, ev, k3, 9
add_only p, od, k3, 10
add_only p, ev, k3, 11
add_only p, od
/* update state */
add dgbv.2s, dgbv.2s, dg1v.2s
add dgav.4s, dgav.4s, dg0v.4s
cbnz w0, 0b
/*
* Final block: add padding and total bit count.
* Skip if we have no total byte count in x4. In that case, the input
* size was not a round multiple of the block size, and the padding is
* handled by the C code.
*/
cbz x4, 3f
movi v9.2d, #0
mov x8, #0x80000000
movi v10.2d, #0
ror x7, x4, #29 // ror(lsl(x4, 3), 32)
fmov d8, x8
mov x4, #0
mov v11.d[0], xzr
mov v11.d[1], x7
b 2b
/* store new state */
3: str dga, [x2]
str dgb, [x2, #16]
ret
ENDPROC(sha1_ce_transform)
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