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linux/arch/arm64/crypto/aes-neonbs-core.S
Ard Biesheuvel dfc6031ec9 crypto: arm64/aes-neonbs-xts - use plain NEON for non-power-of-2 input sizes 
Even though the kernel's implementations of AES-XTS were updated to
implement ciphertext stealing and can operate on inputs of any size
larger than or equal to the AES block size, this feature is rarely used
in practice.

In fact, in the kernel, AES-XTS is only used to operate on 4096 or 512
byte blocks, which means that not only the ciphertext stealing is
effectively dead code, the logic in the bit sliced NEON implementation
to deal with fewer than 8 blocks at a time is also never used.

Since the bit-sliced NEON driver already depends on the plain NEON
version, which is slower but can operate on smaller data quantities more
straightforwardly, let's fallback to the plain NEON implementation of
XTS for any residual inputs that are not multiples of 128 bytes. This
allows us to remove a lot of complicated logic that rarely gets
exercised in practice.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2022-02-05 15:10:51 +11:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Bit sliced AES using NEON instructions
*
* Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org>
*/
/*
* The algorithm implemented here is described in detail by the paper
* 'Faster and Timing-Attack Resistant AES-GCM' by Emilia Kaesper and
* Peter Schwabe (https://eprint.iacr.org/2009/129.pdf)
*
* This implementation is based primarily on the OpenSSL implementation
* for 32-bit ARM written by Andy Polyakov <appro@openssl.org>
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
.text
rounds .req x11
bskey .req x12
.macro in_bs_ch, b0, b1, b2, b3, b4, b5, b6, b7
eor \b2, \b2, \b1
eor \b5, \b5, \b6
eor \b3, \b3, \b0
eor \b6, \b6, \b2
eor \b5, \b5, \b0
eor \b6, \b6, \b3
eor \b3, \b3, \b7
eor \b7, \b7, \b5
eor \b3, \b3, \b4
eor \b4, \b4, \b5
eor \b2, \b2, \b7
eor \b3, \b3, \b1
eor \b1, \b1, \b5
.endm
.macro out_bs_ch, b0, b1, b2, b3, b4, b5, b6, b7
eor \b0, \b0, \b6
eor \b1, \b1, \b4
eor \b4, \b4, \b6
eor \b2, \b2, \b0
eor \b6, \b6, \b1
eor \b1, \b1, \b5
eor \b5, \b5, \b3
eor \b3, \b3, \b7
eor \b7, \b7, \b5
eor \b2, \b2, \b5
eor \b4, \b4, \b7
.endm
.macro inv_in_bs_ch, b6, b1, b2, b4, b7, b0, b3, b5
eor \b1, \b1, \b7
eor \b4, \b4, \b7
eor \b7, \b7, \b5
eor \b1, \b1, \b3
eor \b2, \b2, \b5
eor \b3, \b3, \b7
eor \b6, \b6, \b1
eor \b2, \b2, \b0
eor \b5, \b5, \b3
eor \b4, \b4, \b6
eor \b0, \b0, \b6
eor \b1, \b1, \b4
.endm
.macro inv_out_bs_ch, b6, b5, b0, b3, b7, b1, b4, b2
eor \b1, \b1, \b5
eor \b2, \b2, \b7
eor \b3, \b3, \b1
eor \b4, \b4, \b5
eor \b7, \b7, \b5
eor \b3, \b3, \b4
eor \b5, \b5, \b0
eor \b3, \b3, \b7
eor \b6, \b6, \b2
eor \b2, \b2, \b1
eor \b6, \b6, \b3
eor \b3, \b3, \b0
eor \b5, \b5, \b6
.endm
.macro mul_gf4, x0, x1, y0, y1, t0, t1
eor \t0, \y0, \y1
and \t0, \t0, \x0
eor \x0, \x0, \x1
and \t1, \x1, \y0
and \x0, \x0, \y1
eor \x1, \t1, \t0
eor \x0, \x0, \t1
.endm
.macro mul_gf4_n_gf4, x0, x1, y0, y1, t0, x2, x3, y2, y3, t1
eor \t0, \y0, \y1
eor \t1, \y2, \y3
and \t0, \t0, \x0
and \t1, \t1, \x2
eor \x0, \x0, \x1
eor \x2, \x2, \x3
and \x1, \x1, \y0
and \x3, \x3, \y2
and \x0, \x0, \y1
and \x2, \x2, \y3
eor \x1, \x1, \x0
eor \x2, \x2, \x3
eor \x0, \x0, \t0
eor \x3, \x3, \t1
.endm
.macro mul_gf16_2, x0, x1, x2, x3, x4, x5, x6, x7, \
y0, y1, y2, y3, t0, t1, t2, t3
eor \t0, \x0, \x2
eor \t1, \x1, \x3
mul_gf4 \x0, \x1, \y0, \y1, \t2, \t3
eor \y0, \y0, \y2
eor \y1, \y1, \y3
mul_gf4_n_gf4 \t0, \t1, \y0, \y1, \t3, \x2, \x3, \y2, \y3, \t2
eor \x0, \x0, \t0
eor \x2, \x2, \t0
eor \x1, \x1, \t1
eor \x3, \x3, \t1
eor \t0, \x4, \x6
eor \t1, \x5, \x7
mul_gf4_n_gf4 \t0, \t1, \y0, \y1, \t3, \x6, \x7, \y2, \y3, \t2
eor \y0, \y0, \y2
eor \y1, \y1, \y3
mul_gf4 \x4, \x5, \y0, \y1, \t2, \t3
eor \x4, \x4, \t0
eor \x6, \x6, \t0
eor \x5, \x5, \t1
eor \x7, \x7, \t1
.endm
.macro inv_gf256, x0, x1, x2, x3, x4, x5, x6, x7, \
t0, t1, t2, t3, s0, s1, s2, s3
eor \t3, \x4, \x6
eor \t0, \x5, \x7
eor \t1, \x1, \x3
eor \s1, \x7, \x6
eor \s0, \x0, \x2
eor \s3, \t3, \t0
orr \t2, \t0, \t1
and \s2, \t3, \s0
orr \t3, \t3, \s0
eor \s0, \s0, \t1
and \t0, \t0, \t1
eor \t1, \x3, \x2
and \s3, \s3, \s0
and \s1, \s1, \t1
eor \t1, \x4, \x5
eor \s0, \x1, \x0
eor \t3, \t3, \s1
eor \t2, \t2, \s1
and \s1, \t1, \s0
orr \t1, \t1, \s0
eor \t3, \t3, \s3
eor \t0, \t0, \s1
eor \t2, \t2, \s2
eor \t1, \t1, \s3
eor \t0, \t0, \s2
and \s0, \x7, \x3
eor \t1, \t1, \s2
and \s1, \x6, \x2
and \s2, \x5, \x1
orr \s3, \x4, \x0
eor \t3, \t3, \s0
eor \t1, \t1, \s2
eor \s0, \t0, \s3
eor \t2, \t2, \s1
and \s2, \t3, \t1
eor \s1, \t2, \s2
eor \s3, \s0, \s2
bsl \s1, \t1, \s0
not \t0, \s0
bsl \s0, \s1, \s3
bsl \t0, \s1, \s3
bsl \s3, \t3, \t2
eor \t3, \t3, \t2
and \s2, \s0, \s3
eor \t1, \t1, \t0
eor \s2, \s2, \t3
mul_gf16_2 \x0, \x1, \x2, \x3, \x4, \x5, \x6, \x7, \
\s3, \s2, \s1, \t1, \s0, \t0, \t2, \t3
.endm
.macro sbox, b0, b1, b2, b3, b4, b5, b6, b7, \
t0, t1, t2, t3, s0, s1, s2, s3
in_bs_ch \b0\().16b, \b1\().16b, \b2\().16b, \b3\().16b, \
\b4\().16b, \b5\().16b, \b6\().16b, \b7\().16b
inv_gf256 \b6\().16b, \b5\().16b, \b0\().16b, \b3\().16b, \
\b7\().16b, \b1\().16b, \b4\().16b, \b2\().16b, \
\t0\().16b, \t1\().16b, \t2\().16b, \t3\().16b, \
\s0\().16b, \s1\().16b, \s2\().16b, \s3\().16b
out_bs_ch \b7\().16b, \b1\().16b, \b4\().16b, \b2\().16b, \
\b6\().16b, \b5\().16b, \b0\().16b, \b3\().16b
.endm
.macro inv_sbox, b0, b1, b2, b3, b4, b5, b6, b7, \
t0, t1, t2, t3, s0, s1, s2, s3
inv_in_bs_ch \b0\().16b, \b1\().16b, \b2\().16b, \b3\().16b, \
\b4\().16b, \b5\().16b, \b6\().16b, \b7\().16b
inv_gf256 \b5\().16b, \b1\().16b, \b2\().16b, \b6\().16b, \
\b3\().16b, \b7\().16b, \b0\().16b, \b4\().16b, \
\t0\().16b, \t1\().16b, \t2\().16b, \t3\().16b, \
\s0\().16b, \s1\().16b, \s2\().16b, \s3\().16b
inv_out_bs_ch \b3\().16b, \b7\().16b, \b0\().16b, \b4\().16b, \
\b5\().16b, \b1\().16b, \b2\().16b, \b6\().16b
.endm
.macro enc_next_rk
ldp q16, q17, [bskey], #128
ldp q18, q19, [bskey, #-96]
ldp q20, q21, [bskey, #-64]
ldp q22, q23, [bskey, #-32]
.endm
.macro dec_next_rk
ldp q16, q17, [bskey, #-128]!
ldp q18, q19, [bskey, #32]
ldp q20, q21, [bskey, #64]
ldp q22, q23, [bskey, #96]
.endm
.macro add_round_key, x0, x1, x2, x3, x4, x5, x6, x7
eor \x0\().16b, \x0\().16b, v16.16b
eor \x1\().16b, \x1\().16b, v17.16b
eor \x2\().16b, \x2\().16b, v18.16b
eor \x3\().16b, \x3\().16b, v19.16b
eor \x4\().16b, \x4\().16b, v20.16b
eor \x5\().16b, \x5\().16b, v21.16b
eor \x6\().16b, \x6\().16b, v22.16b
eor \x7\().16b, \x7\().16b, v23.16b
.endm
.macro shift_rows, x0, x1, x2, x3, x4, x5, x6, x7, mask
tbl \x0\().16b, {\x0\().16b}, \mask\().16b
tbl \x1\().16b, {\x1\().16b}, \mask\().16b
tbl \x2\().16b, {\x2\().16b}, \mask\().16b
tbl \x3\().16b, {\x3\().16b}, \mask\().16b
tbl \x4\().16b, {\x4\().16b}, \mask\().16b
tbl \x5\().16b, {\x5\().16b}, \mask\().16b
tbl \x6\().16b, {\x6\().16b}, \mask\().16b
tbl \x7\().16b, {\x7\().16b}, \mask\().16b
.endm
.macro mix_cols, x0, x1, x2, x3, x4, x5, x6, x7, \
t0, t1, t2, t3, t4, t5, t6, t7, inv
ext \t0\().16b, \x0\().16b, \x0\().16b, #12
ext \t1\().16b, \x1\().16b, \x1\().16b, #12
eor \x0\().16b, \x0\().16b, \t0\().16b
ext \t2\().16b, \x2\().16b, \x2\().16b, #12
eor \x1\().16b, \x1\().16b, \t1\().16b
ext \t3\().16b, \x3\().16b, \x3\().16b, #12
eor \x2\().16b, \x2\().16b, \t2\().16b
ext \t4\().16b, \x4\().16b, \x4\().16b, #12
eor \x3\().16b, \x3\().16b, \t3\().16b
ext \t5\().16b, \x5\().16b, \x5\().16b, #12
eor \x4\().16b, \x4\().16b, \t4\().16b
ext \t6\().16b, \x6\().16b, \x6\().16b, #12
eor \x5\().16b, \x5\().16b, \t5\().16b
ext \t7\().16b, \x7\().16b, \x7\().16b, #12
eor \x6\().16b, \x6\().16b, \t6\().16b
eor \t1\().16b, \t1\().16b, \x0\().16b
eor \x7\().16b, \x7\().16b, \t7\().16b
ext \x0\().16b, \x0\().16b, \x0\().16b, #8
eor \t2\().16b, \t2\().16b, \x1\().16b
eor \t0\().16b, \t0\().16b, \x7\().16b
eor \t1\().16b, \t1\().16b, \x7\().16b
ext \x1\().16b, \x1\().16b, \x1\().16b, #8
eor \t5\().16b, \t5\().16b, \x4\().16b
eor \x0\().16b, \x0\().16b, \t0\().16b
eor \t6\().16b, \t6\().16b, \x5\().16b
eor \x1\().16b, \x1\().16b, \t1\().16b
ext \t0\().16b, \x4\().16b, \x4\().16b, #8
eor \t4\().16b, \t4\().16b, \x3\().16b
ext \t1\().16b, \x5\().16b, \x5\().16b, #8
eor \t7\().16b, \t7\().16b, \x6\().16b
ext \x4\().16b, \x3\().16b, \x3\().16b, #8
eor \t3\().16b, \t3\().16b, \x2\().16b
ext \x5\().16b, \x7\().16b, \x7\().16b, #8
eor \t4\().16b, \t4\().16b, \x7\().16b
ext \x3\().16b, \x6\().16b, \x6\().16b, #8
eor \t3\().16b, \t3\().16b, \x7\().16b
ext \x6\().16b, \x2\().16b, \x2\().16b, #8
eor \x7\().16b, \t1\().16b, \t5\().16b
.ifb \inv
eor \x2\().16b, \t0\().16b, \t4\().16b
eor \x4\().16b, \x4\().16b, \t3\().16b
eor \x5\().16b, \x5\().16b, \t7\().16b
eor \x3\().16b, \x3\().16b, \t6\().16b
eor \x6\().16b, \x6\().16b, \t2\().16b
.else
eor \t3\().16b, \t3\().16b, \x4\().16b
eor \x5\().16b, \x5\().16b, \t7\().16b
eor \x2\().16b, \x3\().16b, \t6\().16b
eor \x3\().16b, \t0\().16b, \t4\().16b
eor \x4\().16b, \x6\().16b, \t2\().16b
mov \x6\().16b, \t3\().16b
.endif
.endm
.macro inv_mix_cols, x0, x1, x2, x3, x4, x5, x6, x7, \
t0, t1, t2, t3, t4, t5, t6, t7
ext \t0\().16b, \x0\().16b, \x0\().16b, #8
ext \t6\().16b, \x6\().16b, \x6\().16b, #8
ext \t7\().16b, \x7\().16b, \x7\().16b, #8
eor \t0\().16b, \t0\().16b, \x0\().16b
ext \t1\().16b, \x1\().16b, \x1\().16b, #8
eor \t6\().16b, \t6\().16b, \x6\().16b
ext \t2\().16b, \x2\().16b, \x2\().16b, #8
eor \t7\().16b, \t7\().16b, \x7\().16b
ext \t3\().16b, \x3\().16b, \x3\().16b, #8
eor \t1\().16b, \t1\().16b, \x1\().16b
ext \t4\().16b, \x4\().16b, \x4\().16b, #8
eor \t2\().16b, \t2\().16b, \x2\().16b
ext \t5\().16b, \x5\().16b, \x5\().16b, #8
eor \t3\().16b, \t3\().16b, \x3\().16b
eor \t4\().16b, \t4\().16b, \x4\().16b
eor \t5\().16b, \t5\().16b, \x5\().16b
eor \x0\().16b, \x0\().16b, \t6\().16b
eor \x1\().16b, \x1\().16b, \t6\().16b
eor \x2\().16b, \x2\().16b, \t0\().16b
eor \x4\().16b, \x4\().16b, \t2\().16b
eor \x3\().16b, \x3\().16b, \t1\().16b
eor \x1\().16b, \x1\().16b, \t7\().16b
eor \x2\().16b, \x2\().16b, \t7\().16b
eor \x4\().16b, \x4\().16b, \t6\().16b
eor \x5\().16b, \x5\().16b, \t3\().16b
eor \x3\().16b, \x3\().16b, \t6\().16b
eor \x6\().16b, \x6\().16b, \t4\().16b
eor \x4\().16b, \x4\().16b, \t7\().16b
eor \x5\().16b, \x5\().16b, \t7\().16b
eor \x7\().16b, \x7\().16b, \t5\().16b
mix_cols \x0, \x1, \x2, \x3, \x4, \x5, \x6, \x7, \
\t0, \t1, \t2, \t3, \t4, \t5, \t6, \t7, 1
.endm
.macro swapmove_2x, a0, b0, a1, b1, n, mask, t0, t1
ushr \t0\().2d, \b0\().2d, #\n
ushr \t1\().2d, \b1\().2d, #\n
eor \t0\().16b, \t0\().16b, \a0\().16b
eor \t1\().16b, \t1\().16b, \a1\().16b
and \t0\().16b, \t0\().16b, \mask\().16b
and \t1\().16b, \t1\().16b, \mask\().16b
eor \a0\().16b, \a0\().16b, \t0\().16b
shl \t0\().2d, \t0\().2d, #\n
eor \a1\().16b, \a1\().16b, \t1\().16b
shl \t1\().2d, \t1\().2d, #\n
eor \b0\().16b, \b0\().16b, \t0\().16b
eor \b1\().16b, \b1\().16b, \t1\().16b
.endm
.macro bitslice, x7, x6, x5, x4, x3, x2, x1, x0, t0, t1, t2, t3
movi \t0\().16b, #0x55
movi \t1\().16b, #0x33
swapmove_2x \x0, \x1, \x2, \x3, 1, \t0, \t2, \t3
swapmove_2x \x4, \x5, \x6, \x7, 1, \t0, \t2, \t3
movi \t0\().16b, #0x0f
swapmove_2x \x0, \x2, \x1, \x3, 2, \t1, \t2, \t3
swapmove_2x \x4, \x6, \x5, \x7, 2, \t1, \t2, \t3
swapmove_2x \x0, \x4, \x1, \x5, 4, \t0, \t2, \t3
swapmove_2x \x2, \x6, \x3, \x7, 4, \t0, \t2, \t3
.endm
.align 6
M0: .octa 0x0004080c0105090d02060a0e03070b0f
M0SR: .octa 0x0004080c05090d010a0e02060f03070b
SR: .octa 0x0f0e0d0c0a09080b0504070600030201
SRM0: .octa 0x01060b0c0207080d0304090e00050a0f
M0ISR: .octa 0x0004080c0d0105090a0e0206070b0f03
ISR: .octa 0x0f0e0d0c080b0a090504070602010003
ISRM0: .octa 0x0306090c00070a0d01040b0e0205080f
/*
* void aesbs_convert_key(u8 out[], u32 const rk[], int rounds)
*/
SYM_FUNC_START(aesbs_convert_key)
ld1 {v7.4s}, [x1], #16 // load round 0 key
ld1 {v17.4s}, [x1], #16 // load round 1 key
movi v8.16b, #0x01 // bit masks
movi v9.16b, #0x02
movi v10.16b, #0x04
movi v11.16b, #0x08
movi v12.16b, #0x10
movi v13.16b, #0x20
movi v14.16b, #0x40
movi v15.16b, #0x80
ldr q16, M0
sub x2, x2, #1
str q7, [x0], #16 // save round 0 key
.Lkey_loop:
tbl v7.16b ,{v17.16b}, v16.16b
ld1 {v17.4s}, [x1], #16 // load next round key
cmtst v0.16b, v7.16b, v8.16b
cmtst v1.16b, v7.16b, v9.16b
cmtst v2.16b, v7.16b, v10.16b
cmtst v3.16b, v7.16b, v11.16b
cmtst v4.16b, v7.16b, v12.16b
cmtst v5.16b, v7.16b, v13.16b
cmtst v6.16b, v7.16b, v14.16b
cmtst v7.16b, v7.16b, v15.16b
not v0.16b, v0.16b
not v1.16b, v1.16b
not v5.16b, v5.16b
not v6.16b, v6.16b
subs x2, x2, #1
stp q0, q1, [x0], #128
stp q2, q3, [x0, #-96]
stp q4, q5, [x0, #-64]
stp q6, q7, [x0, #-32]
b.ne .Lkey_loop
movi v7.16b, #0x63 // compose .L63
eor v17.16b, v17.16b, v7.16b
str q17, [x0]
ret
SYM_FUNC_END(aesbs_convert_key)
.align 4
SYM_FUNC_START_LOCAL(aesbs_encrypt8)
ldr q9, [bskey], #16 // round 0 key
ldr q8, M0SR
ldr q24, SR
eor v10.16b, v0.16b, v9.16b // xor with round0 key
eor v11.16b, v1.16b, v9.16b
tbl v0.16b, {v10.16b}, v8.16b
eor v12.16b, v2.16b, v9.16b
tbl v1.16b, {v11.16b}, v8.16b
eor v13.16b, v3.16b, v9.16b
tbl v2.16b, {v12.16b}, v8.16b
eor v14.16b, v4.16b, v9.16b
tbl v3.16b, {v13.16b}, v8.16b
eor v15.16b, v5.16b, v9.16b
tbl v4.16b, {v14.16b}, v8.16b
eor v10.16b, v6.16b, v9.16b
tbl v5.16b, {v15.16b}, v8.16b
eor v11.16b, v7.16b, v9.16b
tbl v6.16b, {v10.16b}, v8.16b
tbl v7.16b, {v11.16b}, v8.16b
bitslice v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11
sub rounds, rounds, #1
b .Lenc_sbox
.Lenc_loop:
shift_rows v0, v1, v2, v3, v4, v5, v6, v7, v24
.Lenc_sbox:
sbox v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12, \
v13, v14, v15
subs rounds, rounds, #1
b.cc .Lenc_done
enc_next_rk
mix_cols v0, v1, v4, v6, v3, v7, v2, v5, v8, v9, v10, v11, v12, \
v13, v14, v15
add_round_key v0, v1, v2, v3, v4, v5, v6, v7
b.ne .Lenc_loop
ldr q24, SRM0
b .Lenc_loop
.Lenc_done:
ldr q12, [bskey] // last round key
bitslice v0, v1, v4, v6, v3, v7, v2, v5, v8, v9, v10, v11
eor v0.16b, v0.16b, v12.16b
eor v1.16b, v1.16b, v12.16b
eor v4.16b, v4.16b, v12.16b
eor v6.16b, v6.16b, v12.16b
eor v3.16b, v3.16b, v12.16b
eor v7.16b, v7.16b, v12.16b
eor v2.16b, v2.16b, v12.16b
eor v5.16b, v5.16b, v12.16b
ret
SYM_FUNC_END(aesbs_encrypt8)
.align 4
SYM_FUNC_START_LOCAL(aesbs_decrypt8)
lsl x9, rounds, #7
add bskey, bskey, x9
ldr q9, [bskey, #-112]! // round 0 key
ldr q8, M0ISR
ldr q24, ISR
eor v10.16b, v0.16b, v9.16b // xor with round0 key
eor v11.16b, v1.16b, v9.16b
tbl v0.16b, {v10.16b}, v8.16b
eor v12.16b, v2.16b, v9.16b
tbl v1.16b, {v11.16b}, v8.16b
eor v13.16b, v3.16b, v9.16b
tbl v2.16b, {v12.16b}, v8.16b
eor v14.16b, v4.16b, v9.16b
tbl v3.16b, {v13.16b}, v8.16b
eor v15.16b, v5.16b, v9.16b
tbl v4.16b, {v14.16b}, v8.16b
eor v10.16b, v6.16b, v9.16b
tbl v5.16b, {v15.16b}, v8.16b
eor v11.16b, v7.16b, v9.16b
tbl v6.16b, {v10.16b}, v8.16b
tbl v7.16b, {v11.16b}, v8.16b
bitslice v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11
sub rounds, rounds, #1
b .Ldec_sbox
.Ldec_loop:
shift_rows v0, v1, v2, v3, v4, v5, v6, v7, v24
.Ldec_sbox:
inv_sbox v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12, \
v13, v14, v15
subs rounds, rounds, #1
b.cc .Ldec_done
dec_next_rk
add_round_key v0, v1, v6, v4, v2, v7, v3, v5
inv_mix_cols v0, v1, v6, v4, v2, v7, v3, v5, v8, v9, v10, v11, v12, \
v13, v14, v15
b.ne .Ldec_loop
ldr q24, ISRM0
b .Ldec_loop
.Ldec_done:
ldr q12, [bskey, #-16] // last round key
bitslice v0, v1, v6, v4, v2, v7, v3, v5, v8, v9, v10, v11
eor v0.16b, v0.16b, v12.16b
eor v1.16b, v1.16b, v12.16b
eor v6.16b, v6.16b, v12.16b
eor v4.16b, v4.16b, v12.16b
eor v2.16b, v2.16b, v12.16b
eor v7.16b, v7.16b, v12.16b
eor v3.16b, v3.16b, v12.16b
eor v5.16b, v5.16b, v12.16b
ret
SYM_FUNC_END(aesbs_decrypt8)
/*
* aesbs_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks)
* aesbs_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks)
*/
.macro __ecb_crypt, do8, o0, o1, o2, o3, o4, o5, o6, o7
frame_push 5
mov x19, x0
mov x20, x1
mov x21, x2
mov x22, x3
mov x23, x4
99: mov x5, #1
lsl x5, x5, x23
subs w23, w23, #8
csel x23, x23, xzr, pl
csel x5, x5, xzr, mi
ld1 {v0.16b}, [x20], #16
tbnz x5, #1, 0f
ld1 {v1.16b}, [x20], #16
tbnz x5, #2, 0f
ld1 {v2.16b}, [x20], #16
tbnz x5, #3, 0f
ld1 {v3.16b}, [x20], #16
tbnz x5, #4, 0f
ld1 {v4.16b}, [x20], #16
tbnz x5, #5, 0f
ld1 {v5.16b}, [x20], #16
tbnz x5, #6, 0f
ld1 {v6.16b}, [x20], #16
tbnz x5, #7, 0f
ld1 {v7.16b}, [x20], #16
0: mov bskey, x21
mov rounds, x22
bl \do8
st1 {\o0\().16b}, [x19], #16
tbnz x5, #1, 1f
st1 {\o1\().16b}, [x19], #16
tbnz x5, #2, 1f
st1 {\o2\().16b}, [x19], #16
tbnz x5, #3, 1f
st1 {\o3\().16b}, [x19], #16
tbnz x5, #4, 1f
st1 {\o4\().16b}, [x19], #16
tbnz x5, #5, 1f
st1 {\o5\().16b}, [x19], #16
tbnz x5, #6, 1f
st1 {\o6\().16b}, [x19], #16
tbnz x5, #7, 1f
st1 {\o7\().16b}, [x19], #16
cbz x23, 1f
b 99b
1: frame_pop
ret
.endm
.align 4
SYM_FUNC_START(aesbs_ecb_encrypt)
__ecb_crypt aesbs_encrypt8, v0, v1, v4, v6, v3, v7, v2, v5
SYM_FUNC_END(aesbs_ecb_encrypt)
.align 4
SYM_FUNC_START(aesbs_ecb_decrypt)
__ecb_crypt aesbs_decrypt8, v0, v1, v6, v4, v2, v7, v3, v5
SYM_FUNC_END(aesbs_ecb_decrypt)
/*
* aesbs_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[])
*/
.align 4
SYM_FUNC_START(aesbs_cbc_decrypt)
frame_push 6
mov x19, x0
mov x20, x1
mov x21, x2
mov x22, x3
mov x23, x4
mov x24, x5
99: mov x6, #1
lsl x6, x6, x23
subs w23, w23, #8
csel x23, x23, xzr, pl
csel x6, x6, xzr, mi
ld1 {v0.16b}, [x20], #16
mov v25.16b, v0.16b
tbnz x6, #1, 0f
ld1 {v1.16b}, [x20], #16
mov v26.16b, v1.16b
tbnz x6, #2, 0f
ld1 {v2.16b}, [x20], #16
mov v27.16b, v2.16b
tbnz x6, #3, 0f
ld1 {v3.16b}, [x20], #16
mov v28.16b, v3.16b
tbnz x6, #4, 0f
ld1 {v4.16b}, [x20], #16
mov v29.16b, v4.16b
tbnz x6, #5, 0f
ld1 {v5.16b}, [x20], #16
mov v30.16b, v5.16b
tbnz x6, #6, 0f
ld1 {v6.16b}, [x20], #16
mov v31.16b, v6.16b
tbnz x6, #7, 0f
ld1 {v7.16b}, [x20]
0: mov bskey, x21
mov rounds, x22
bl aesbs_decrypt8
ld1 {v24.16b}, [x24] // load IV
eor v1.16b, v1.16b, v25.16b
eor v6.16b, v6.16b, v26.16b
eor v4.16b, v4.16b, v27.16b
eor v2.16b, v2.16b, v28.16b
eor v7.16b, v7.16b, v29.16b
eor v0.16b, v0.16b, v24.16b
eor v3.16b, v3.16b, v30.16b
eor v5.16b, v5.16b, v31.16b
st1 {v0.16b}, [x19], #16
mov v24.16b, v25.16b
tbnz x6, #1, 1f
st1 {v1.16b}, [x19], #16
mov v24.16b, v26.16b
tbnz x6, #2, 1f
st1 {v6.16b}, [x19], #16
mov v24.16b, v27.16b
tbnz x6, #3, 1f
st1 {v4.16b}, [x19], #16
mov v24.16b, v28.16b
tbnz x6, #4, 1f
st1 {v2.16b}, [x19], #16
mov v24.16b, v29.16b
tbnz x6, #5, 1f
st1 {v7.16b}, [x19], #16
mov v24.16b, v30.16b
tbnz x6, #6, 1f
st1 {v3.16b}, [x19], #16
mov v24.16b, v31.16b
tbnz x6, #7, 1f
ld1 {v24.16b}, [x20], #16
st1 {v5.16b}, [x19], #16
1: st1 {v24.16b}, [x24] // store IV
cbz x23, 2f
b 99b
2: frame_pop
ret
SYM_FUNC_END(aesbs_cbc_decrypt)
.macro next_tweak, out, in, const, tmp
sshr \tmp\().2d, \in\().2d, #63
and \tmp\().16b, \tmp\().16b, \const\().16b
add \out\().2d, \in\().2d, \in\().2d
ext \tmp\().16b, \tmp\().16b, \tmp\().16b, #8
eor \out\().16b, \out\().16b, \tmp\().16b
.endm
/*
* aesbs_xts_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[])
* aesbs_xts_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[])
*/
SYM_FUNC_START_LOCAL(__xts_crypt8)
movi v18.2s, #0x1
movi v19.2s, #0x87
uzp1 v18.4s, v18.4s, v19.4s
ld1 {v0.16b-v3.16b}, [x1], #64
ld1 {v4.16b-v7.16b}, [x1], #64
next_tweak v26, v25, v18, v19
next_tweak v27, v26, v18, v19
next_tweak v28, v27, v18, v19
next_tweak v29, v28, v18, v19
next_tweak v30, v29, v18, v19
next_tweak v31, v30, v18, v19
next_tweak v16, v31, v18, v19
next_tweak v17, v16, v18, v19
eor v0.16b, v0.16b, v25.16b
eor v1.16b, v1.16b, v26.16b
eor v2.16b, v2.16b, v27.16b
eor v3.16b, v3.16b, v28.16b
eor v4.16b, v4.16b, v29.16b
eor v5.16b, v5.16b, v30.16b
eor v6.16b, v6.16b, v31.16b
eor v7.16b, v7.16b, v16.16b
stp q16, q17, [sp, #16]
mov bskey, x2
mov rounds, x3
br x16
SYM_FUNC_END(__xts_crypt8)
.macro __xts_crypt, do8, o0, o1, o2, o3, o4, o5, o6, o7
stp x29, x30, [sp, #-48]!
mov x29, sp
ld1 {v25.16b}, [x5]
0: adr x16, \do8
bl __xts_crypt8
eor v16.16b, \o0\().16b, v25.16b
eor v17.16b, \o1\().16b, v26.16b
eor v18.16b, \o2\().16b, v27.16b
eor v19.16b, \o3\().16b, v28.16b
ldp q24, q25, [sp, #16]
eor v20.16b, \o4\().16b, v29.16b
eor v21.16b, \o5\().16b, v30.16b
eor v22.16b, \o6\().16b, v31.16b
eor v23.16b, \o7\().16b, v24.16b
st1 {v16.16b-v19.16b}, [x0], #64
st1 {v20.16b-v23.16b}, [x0], #64
subs x4, x4, #8
b.gt 0b
st1 {v25.16b}, [x5]
ldp x29, x30, [sp], #48
ret
.endm
SYM_FUNC_START(aesbs_xts_encrypt)
__xts_crypt aesbs_encrypt8, v0, v1, v4, v6, v3, v7, v2, v5
SYM_FUNC_END(aesbs_xts_encrypt)
SYM_FUNC_START(aesbs_xts_decrypt)
__xts_crypt aesbs_decrypt8, v0, v1, v6, v4, v2, v7, v3, v5
SYM_FUNC_END(aesbs_xts_decrypt)
.macro next_ctr, v
mov \v\().d[1], x8
adds x8, x8, #1
mov \v\().d[0], x7
adc x7, x7, xzr
rev64 \v\().16b, \v\().16b
.endm
/*
* aesbs_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[],
* int rounds, int blocks, u8 iv[])
*/
SYM_FUNC_START(aesbs_ctr_encrypt)
stp x29, x30, [sp, #-16]!
mov x29, sp
ldp x7, x8, [x5]
ld1 {v0.16b}, [x5]
CPU_LE( rev x7, x7 )
CPU_LE( rev x8, x8 )
adds x8, x8, #1
adc x7, x7, xzr
0: next_ctr v1
next_ctr v2
next_ctr v3
next_ctr v4
next_ctr v5
next_ctr v6
next_ctr v7
mov bskey, x2
mov rounds, x3
bl aesbs_encrypt8
ld1 { v8.16b-v11.16b}, [x1], #64
ld1 {v12.16b-v15.16b}, [x1], #64
eor v8.16b, v0.16b, v8.16b
eor v9.16b, v1.16b, v9.16b
eor v10.16b, v4.16b, v10.16b
eor v11.16b, v6.16b, v11.16b
eor v12.16b, v3.16b, v12.16b
eor v13.16b, v7.16b, v13.16b
eor v14.16b, v2.16b, v14.16b
eor v15.16b, v5.16b, v15.16b
st1 { v8.16b-v11.16b}, [x0], #64
st1 {v12.16b-v15.16b}, [x0], #64
next_ctr v0
subs x4, x4, #8
b.gt 0b
st1 {v0.16b}, [x5]
ldp x29, x30, [sp], #16
ret
SYM_FUNC_END(aesbs_ctr_encrypt)
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