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/*
* ChaCha20 256-bit cipher algorithm, RFC7539, x64 AVX2 functions
*
* Copyright (C) 2015 Martin Willi
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/linkage.h>
.section .rodata.cst32.ROT8, "aM", @progbits, 32
.align 32
ROT8: .octa 0x0e0d0c0f0a09080b0605040702010003
.octa 0x0e0d0c0f0a09080b0605040702010003
.section .rodata.cst32.ROT16, "aM", @progbits, 32
.align 32
ROT16: .octa 0x0d0c0f0e09080b0a0504070601000302
.octa 0x0d0c0f0e09080b0a0504070601000302
.section .rodata.cst32.CTRINC, "aM", @progbits, 32
.align 32
CTRINC: .octa 0x00000003000000020000000100000000
.octa 0x00000007000000060000000500000004
.text
ENTRY(chacha20_8block_xor_avx2)
# %rdi: Input state matrix, s
# %rsi: 8 data blocks output, o
# %rdx: 8 data blocks input, i
# This function encrypts eight consecutive ChaCha20 blocks by loading
# the state matrix in AVX registers eight times. As we need some
# scratch registers, we save the first four registers on the stack. The
# algorithm performs each operation on the corresponding word of each
# state matrix, hence requires no word shuffling. For final XORing step
# we transpose the matrix by interleaving 32-, 64- and then 128-bit
# words, which allows us to do XOR in AVX registers. 8/16-bit word
# rotation is done with the slightly better performing byte shuffling,
# 7/12-bit word rotation uses traditional shift+OR.
vzeroupper
# 4 * 32 byte stack, 32-byte aligned
mov %rsp, %r8
and $~31, %rsp
sub $0x80, %rsp
# x0..15[0-7] = s[0..15]
vpbroadcastd 0x00(%rdi),%ymm0
vpbroadcastd 0x04(%rdi),%ymm1
vpbroadcastd 0x08(%rdi),%ymm2
vpbroadcastd 0x0c(%rdi),%ymm3
vpbroadcastd 0x10(%rdi),%ymm4
vpbroadcastd 0x14(%rdi),%ymm5
vpbroadcastd 0x18(%rdi),%ymm6
vpbroadcastd 0x1c(%rdi),%ymm7
vpbroadcastd 0x20(%rdi),%ymm8
vpbroadcastd 0x24(%rdi),%ymm9
vpbroadcastd 0x28(%rdi),%ymm10
vpbroadcastd 0x2c(%rdi),%ymm11
vpbroadcastd 0x30(%rdi),%ymm12
vpbroadcastd 0x34(%rdi),%ymm13
vpbroadcastd 0x38(%rdi),%ymm14
vpbroadcastd 0x3c(%rdi),%ymm15
# x0..3 on stack
vmovdqa %ymm0,0x00(%rsp)
vmovdqa %ymm1,0x20(%rsp)
vmovdqa %ymm2,0x40(%rsp)
vmovdqa %ymm3,0x60(%rsp)
vmovdqa CTRINC(%rip),%ymm1
vmovdqa ROT8(%rip),%ymm2
vmovdqa ROT16(%rip),%ymm3
# x12 += counter values 0-3
vpaddd %ymm1,%ymm12,%ymm12
mov $10,%ecx
.Ldoubleround8:
# x0 += x4, x12 = rotl32(x12 ^ x0, 16)
vpaddd 0x00(%rsp),%ymm4,%ymm0
vmovdqa %ymm0,0x00(%rsp)
vpxor %ymm0,%ymm12,%ymm12
vpshufb %ymm3,%ymm12,%ymm12
# x1 += x5, x13 = rotl32(x13 ^ x1, 16)
vpaddd 0x20(%rsp),%ymm5,%ymm0
vmovdqa %ymm0,0x20(%rsp)
vpxor %ymm0,%ymm13,%ymm13
vpshufb %ymm3,%ymm13,%ymm13
# x2 += x6, x14 = rotl32(x14 ^ x2, 16)
vpaddd 0x40(%rsp),%ymm6,%ymm0
vmovdqa %ymm0,0x40(%rsp)
vpxor %ymm0,%ymm14,%ymm14
vpshufb %ymm3,%ymm14,%ymm14
# x3 += x7, x15 = rotl32(x15 ^ x3, 16)
vpaddd 0x60(%rsp),%ymm7,%ymm0
vmovdqa %ymm0,0x60(%rsp)
vpxor %ymm0,%ymm15,%ymm15
vpshufb %ymm3,%ymm15,%ymm15
# x8 += x12, x4 = rotl32(x4 ^ x8, 12)
vpaddd %ymm12,%ymm8,%ymm8
vpxor %ymm8,%ymm4,%ymm4
vpslld $12,%ymm4,%ymm0
vpsrld $20,%ymm4,%ymm4
vpor %ymm0,%ymm4,%ymm4
# x9 += x13, x5 = rotl32(x5 ^ x9, 12)
vpaddd %ymm13,%ymm9,%ymm9
vpxor %ymm9,%ymm5,%ymm5
vpslld $12,%ymm5,%ymm0
vpsrld $20,%ymm5,%ymm5
vpor %ymm0,%ymm5,%ymm5
# x10 += x14, x6 = rotl32(x6 ^ x10, 12)
vpaddd %ymm14,%ymm10,%ymm10
vpxor %ymm10,%ymm6,%ymm6
vpslld $12,%ymm6,%ymm0
vpsrld $20,%ymm6,%ymm6
vpor %ymm0,%ymm6,%ymm6
# x11 += x15, x7 = rotl32(x7 ^ x11, 12)
vpaddd %ymm15,%ymm11,%ymm11
vpxor %ymm11,%ymm7,%ymm7
vpslld $12,%ymm7,%ymm0
vpsrld $20,%ymm7,%ymm7
vpor %ymm0,%ymm7,%ymm7
# x0 += x4, x12 = rotl32(x12 ^ x0, 8)
vpaddd 0x00(%rsp),%ymm4,%ymm0
vmovdqa %ymm0,0x00(%rsp)
vpxor %ymm0,%ymm12,%ymm12
vpshufb %ymm2,%ymm12,%ymm12
# x1 += x5, x13 = rotl32(x13 ^ x1, 8)
vpaddd 0x20(%rsp),%ymm5,%ymm0
vmovdqa %ymm0,0x20(%rsp)
vpxor %ymm0,%ymm13,%ymm13
vpshufb %ymm2,%ymm13,%ymm13
# x2 += x6, x14 = rotl32(x14 ^ x2, 8)
vpaddd 0x40(%rsp),%ymm6,%ymm0
vmovdqa %ymm0,0x40(%rsp)
vpxor %ymm0,%ymm14,%ymm14
vpshufb %ymm2,%ymm14,%ymm14
# x3 += x7, x15 = rotl32(x15 ^ x3, 8)
vpaddd 0x60(%rsp),%ymm7,%ymm0
vmovdqa %ymm0,0x60(%rsp)
vpxor %ymm0,%ymm15,%ymm15
vpshufb %ymm2,%ymm15,%ymm15
# x8 += x12, x4 = rotl32(x4 ^ x8, 7)
vpaddd %ymm12,%ymm8,%ymm8
vpxor %ymm8,%ymm4,%ymm4
vpslld $7,%ymm4,%ymm0
vpsrld $25,%ymm4,%ymm4
vpor %ymm0,%ymm4,%ymm4
# x9 += x13, x5 = rotl32(x5 ^ x9, 7)
vpaddd %ymm13,%ymm9,%ymm9
vpxor %ymm9,%ymm5,%ymm5
vpslld $7,%ymm5,%ymm0
vpsrld $25,%ymm5,%ymm5
vpor %ymm0,%ymm5,%ymm5
# x10 += x14, x6 = rotl32(x6 ^ x10, 7)
vpaddd %ymm14,%ymm10,%ymm10
vpxor %ymm10,%ymm6,%ymm6
vpslld $7,%ymm6,%ymm0
vpsrld $25,%ymm6,%ymm6
vpor %ymm0,%ymm6,%ymm6
# x11 += x15, x7 = rotl32(x7 ^ x11, 7)
vpaddd %ymm15,%ymm11,%ymm11
vpxor %ymm11,%ymm7,%ymm7
vpslld $7,%ymm7,%ymm0
vpsrld $25,%ymm7,%ymm7
vpor %ymm0,%ymm7,%ymm7
# x0 += x5, x15 = rotl32(x15 ^ x0, 16)
vpaddd 0x00(%rsp),%ymm5,%ymm0
vmovdqa %ymm0,0x00(%rsp)
vpxor %ymm0,%ymm15,%ymm15
vpshufb %ymm3,%ymm15,%ymm15
# x1 += x6, x12 = rotl32(x12 ^ x1, 16)%ymm0
vpaddd 0x20(%rsp),%ymm6,%ymm0
vmovdqa %ymm0,0x20(%rsp)
vpxor %ymm0,%ymm12,%ymm12
vpshufb %ymm3,%ymm12,%ymm12
# x2 += x7, x13 = rotl32(x13 ^ x2, 16)
vpaddd 0x40(%rsp),%ymm7,%ymm0
vmovdqa %ymm0,0x40(%rsp)
vpxor %ymm0,%ymm13,%ymm13
vpshufb %ymm3,%ymm13,%ymm13
# x3 += x4, x14 = rotl32(x14 ^ x3, 16)
vpaddd 0x60(%rsp),%ymm4,%ymm0
vmovdqa %ymm0,0x60(%rsp)
vpxor %ymm0,%ymm14,%ymm14
vpshufb %ymm3,%ymm14,%ymm14
# x10 += x15, x5 = rotl32(x5 ^ x10, 12)
vpaddd %ymm15,%ymm10,%ymm10
vpxor %ymm10,%ymm5,%ymm5
vpslld $12,%ymm5,%ymm0
vpsrld $20,%ymm5,%ymm5
vpor %ymm0,%ymm5,%ymm5
# x11 += x12, x6 = rotl32(x6 ^ x11, 12)
vpaddd %ymm12,%ymm11,%ymm11
vpxor %ymm11,%ymm6,%ymm6
vpslld $12,%ymm6,%ymm0
vpsrld $20,%ymm6,%ymm6
vpor %ymm0,%ymm6,%ymm6
# x8 += x13, x7 = rotl32(x7 ^ x8, 12)
vpaddd %ymm13,%ymm8,%ymm8
vpxor %ymm8,%ymm7,%ymm7
vpslld $12,%ymm7,%ymm0
vpsrld $20,%ymm7,%ymm7
vpor %ymm0,%ymm7,%ymm7
# x9 += x14, x4 = rotl32(x4 ^ x9, 12)
vpaddd %ymm14,%ymm9,%ymm9
vpxor %ymm9,%ymm4,%ymm4
vpslld $12,%ymm4,%ymm0
vpsrld $20,%ymm4,%ymm4
vpor %ymm0,%ymm4,%ymm4
# x0 += x5, x15 = rotl32(x15 ^ x0, 8)
vpaddd 0x00(%rsp),%ymm5,%ymm0
vmovdqa %ymm0,0x00(%rsp)
vpxor %ymm0,%ymm15,%ymm15
vpshufb %ymm2,%ymm15,%ymm15
# x1 += x6, x12 = rotl32(x12 ^ x1, 8)
vpaddd 0x20(%rsp),%ymm6,%ymm0
vmovdqa %ymm0,0x20(%rsp)
vpxor %ymm0,%ymm12,%ymm12
vpshufb %ymm2,%ymm12,%ymm12
# x2 += x7, x13 = rotl32(x13 ^ x2, 8)
vpaddd 0x40(%rsp),%ymm7,%ymm0
vmovdqa %ymm0,0x40(%rsp)
vpxor %ymm0,%ymm13,%ymm13
vpshufb %ymm2,%ymm13,%ymm13
# x3 += x4, x14 = rotl32(x14 ^ x3, 8)
vpaddd 0x60(%rsp),%ymm4,%ymm0
vmovdqa %ymm0,0x60(%rsp)
vpxor %ymm0,%ymm14,%ymm14
vpshufb %ymm2,%ymm14,%ymm14
# x10 += x15, x5 = rotl32(x5 ^ x10, 7)
vpaddd %ymm15,%ymm10,%ymm10
vpxor %ymm10,%ymm5,%ymm5
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