crypto: x86/chacha20 - refactor to allow varying number of rounds

In preparation for adding XChaCha12 support, rename/refactor the x86_64
SIMD implementations of ChaCha20 to support different numbers of rounds.

Reviewed-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 0 insertions, 792 deletions

diff --git a/arch/x86/crypto/chacha20-ssse3-x86_64.S b/arch/x86/crypto/chacha20-ssse3-x86_64.S
deleted file mode 100644
index f6792789f875..000000000000
--- a/arch/x86/crypto/chacha20-ssse3-x86_64.S
+++ /dev/null
@@ -1,792 +0,0 @@
-/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, x64 SSSE3 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>
-#include <asm/frame.h>
-
-.section	.rodata.cst16.ROT8, "aM", @progbits, 16
-.align 16
-ROT8:	.octa 0x0e0d0c0f0a09080b0605040702010003
-.section	.rodata.cst16.ROT16, "aM", @progbits, 16
-.align 16
-ROT16:	.octa 0x0d0c0f0e09080b0a0504070601000302
-.section	.rodata.cst16.CTRINC, "aM", @progbits, 16
-.align 16
-CTRINC:	.octa 0x00000003000000020000000100000000
-
-.text
-
-/*
- * chacha20_permute - permute one block
- *
- * Permute one 64-byte block where the state matrix is in %xmm0-%xmm3.  This
- * function performs matrix operations on four words in parallel, but requires
- * shuffling to rearrange the words after each round.  8/16-bit word rotation is
- * done with the slightly better performing SSSE3 byte shuffling, 7/12-bit word
- * rotation uses traditional shift+OR.
- *
- * Clobbers: %ecx, %xmm4-%xmm7
- */
-chacha20_permute:
-
-	movdqa		ROT8(%rip),%xmm4
-	movdqa		ROT16(%rip),%xmm5
-	mov		$10,%ecx
-
-.Ldoubleround:
-	# x0 += x1, x3 = rotl32(x3 ^ x0, 16)
-	paddd		%xmm1,%xmm0
-	pxor		%xmm0,%xmm3
-	pshufb		%xmm5,%xmm3
-
-	# x2 += x3, x1 = rotl32(x1 ^ x2, 12)
-	paddd		%xmm3,%xmm2
-	pxor		%xmm2,%xmm1
-	movdqa		%xmm1,%xmm6
-	pslld		$12,%xmm6
-	psrld		$20,%xmm1
-	por		%xmm6,%xmm1
-
-	# x0 += x1, x3 = rotl32(x3 ^ x0, 8)
-	paddd		%xmm1,%xmm0
-	pxor		%xmm0,%xmm3
-	pshufb		%xmm4,%xmm3
-
-	# x2 += x3, x1 = rotl32(x1 ^ x2, 7)
-	paddd		%xmm3,%xmm2
-	pxor		%xmm2,%xmm1
-	movdqa		%xmm1,%xmm7
-	pslld		$7,%xmm7
-	psrld		$25,%xmm1
-	por		%xmm7,%xmm1
-
-	# x1 = shuffle32(x1, MASK(0, 3, 2, 1))
-	pshufd		$0x39,%xmm1,%xmm1
-	# x2 = shuffle32(x2, MASK(1, 0, 3, 2))
-	pshufd		$0x4e,%xmm2,%xmm2
-	# x3 = shuffle32(x3, MASK(2, 1, 0, 3))
-	pshufd		$0x93,%xmm3,%xmm3
-
-	# x0 += x1, x3 = rotl32(x3 ^ x0, 16)
-	paddd		%xmm1,%xmm0
-	pxor		%xmm0,%xmm3
-	pshufb		%xmm5,%xmm3
-
-	# x2 += x3, x1 = rotl32(x1 ^ x2, 12)
-	paddd		%xmm3,%xmm2
-	pxor		%xmm2,%xmm1
-	movdqa		%xmm1,%xmm6
-	pslld		$12,%xmm6
-	psrld		$20,%xmm1
-	por		%xmm6,%xmm1
-
-	# x0 += x1, x3 = rotl32(x3 ^ x0, 8)
-	paddd		%xmm1,%xmm0
-	pxor		%xmm0,%xmm3
-	pshufb		%xmm4,%xmm3
-
-	# x2 += x3, x1 = rotl32(x1 ^ x2, 7)
-	paddd		%xmm3,%xmm2
-	pxor		%xmm2,%xmm1
-	movdqa		%xmm1,%xmm7
-	pslld		$7,%xmm7
-	psrld		$25,%xmm1
-	por		%xmm7,%xmm1
-
-	# x1 = shuffle32(x1, MASK(2, 1, 0, 3))
-	pshufd		$0x93,%xmm1,%xmm1
-	# x2 = shuffle32(x2, MASK(1, 0, 3, 2))
-	pshufd		$0x4e,%xmm2,%xmm2
-	# x3 = shuffle32(x3, MASK(0, 3, 2, 1))
-	pshufd		$0x39,%xmm3,%xmm3
-
-	dec		%ecx
-	jnz		.Ldoubleround
-
-	ret
-ENDPROC(chacha20_permute)
-
-ENTRY(chacha20_block_xor_ssse3)
-	# %rdi: Input state matrix, s
-	# %rsi: up to 1 data block output, o
-	# %rdx: up to 1 data block input, i
-	# %rcx: input/output length in bytes
-	FRAME_BEGIN
-
-	# x0..3 = s0..3
-	movdqa		0x00(%rdi),%xmm0
-	movdqa		0x10(%rdi),%xmm1
-	movdqa		0x20(%rdi),%xmm2
-	movdqa		0x30(%rdi),%xmm3
-	movdqa		%xmm0,%xmm8
-	movdqa		%xmm1,%xmm9
-	movdqa		%xmm2,%xmm10
-	movdqa		%xmm3,%xmm11
-
-	mov		%rcx,%rax
-	call		chacha20_permute
-
-	# o0 = i0 ^ (x0 + s0)
-	paddd		%xmm8,%xmm0
-	cmp		$0x10,%rax
-	jl		.Lxorpart
-	movdqu		0x00(%rdx),%xmm4
-	pxor		%xmm4,%xmm0
-	movdqu		%xmm0,0x00(%rsi)
-	# o1 = i1 ^ (x1 + s1)
-	paddd		%xmm9,%xmm1
-	movdqa		%xmm1,%xmm0
-	cmp		$0x20,%rax
-	jl		.Lxorpart
-	movdqu		0x10(%rdx),%xmm0
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x10(%rsi)
-	# o2 = i2 ^ (x2 + s2)
-	paddd		%xmm10,%xmm2
-	movdqa		%xmm2,%xmm0
-	cmp		$0x30,%rax
-	jl		.Lxorpart
-	movdqu		0x20(%rdx),%xmm0
-	pxor		%xmm2,%xmm0
-	movdqu		%xmm0,0x20(%rsi)
-	# o3 = i3 ^ (x3 + s3)
-	paddd		%xmm11,%xmm3
-	movdqa		%xmm3,%xmm0
-	cmp		$0x40,%rax
-	jl		.Lxorpart
-	movdqu		0x30(%rdx),%xmm0
-	pxor		%xmm3,%xmm0
-	movdqu		%xmm0,0x30(%rsi)
-
-.Ldone:
-	FRAME_END
-	ret
-
-.Lxorpart:
-	# xor remaining bytes from partial register into output
-	mov		%rax,%r9
-	and		$0x0f,%r9
-	jz		.Ldone
-	and		$~0x0f,%rax
-
-	mov		%rsi,%r11
-
-	lea		8(%rsp),%r10
-	sub		$0x10,%rsp
-	and		$~31,%rsp
-
-	lea		(%rdx,%rax),%rsi
-	mov		%rsp,%rdi
-	mov		%r9,%rcx
-	rep movsb
-
-	pxor		0x00(%rsp),%xmm0
-	movdqa		%xmm0,0x00(%rsp)
-
-	mov		%rsp,%rsi
-	lea		(%r11,%rax),%rdi
-	mov		%r9,%rcx
-	rep movsb
-
-	lea		-8(%r10),%rsp
-	jmp		.Ldone
-
-ENDPROC(chacha20_block_xor_ssse3)
-
-ENTRY(hchacha20_block_ssse3)
-	# %rdi: Input state matrix, s
-	# %rsi: output (8 32-bit words)
-	FRAME_BEGIN
-
-	movdqa		0x00(%rdi),%xmm0
-	movdqa		0x10(%rdi),%xmm1
-	movdqa		0x20(%rdi),%xmm2
-	movdqa		0x30(%rdi),%xmm3
-
-	call		chacha20_permute
-
-	movdqu		%xmm0,0x00(%rsi)
-	movdqu		%xmm3,0x10(%rsi)
-
-	FRAME_END
-	ret
-ENDPROC(hchacha20_block_ssse3)
-
-ENTRY(chacha20_4block_xor_ssse3)
-	# %rdi: Input state matrix, s
-	# %rsi: up to 4 data blocks output, o
-	# %rdx: up to 4 data blocks input, i
-	# %rcx: input/output length in bytes
-
-	# This function encrypts four consecutive ChaCha20 blocks by loading the
-	# the state matrix in SSE registers four 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- and then 64-bit words,
-	# which allows us to do XOR in SSE registers. 8/16-bit word rotation is
-	# done with the slightly better performing SSSE3 byte shuffling,
-	# 7/12-bit word rotation uses traditional shift+OR.
-
-	lea		8(%rsp),%r10
-	sub		$0x80,%rsp
-	and		$~63,%rsp
-	mov		%rcx,%rax
-
-	# x0..15[0-3] = s0..3[0..3]
-	movq		0x00(%rdi),%xmm1
-	pshufd		$0x00,%xmm1,%xmm0
-	pshufd		$0x55,%xmm1,%xmm1
-	movq		0x08(%rdi),%xmm3
-	pshufd		$0x00,%xmm3,%xmm2
-	pshufd		$0x55,%xmm3,%xmm3
-	movq		0x10(%rdi),%xmm5
-	pshufd		$0x00,%xmm5,%xmm4
-	pshufd		$0x55,%xmm5,%xmm5
-	movq		0x18(%rdi),%xmm7
-	pshufd		$0x00,%xmm7,%xmm6
-	pshufd		$0x55,%xmm7,%xmm7
-	movq		0x20(%rdi),%xmm9
-	pshufd		$0x00,%xmm9,%xmm8
-	pshufd		$0x55,%xmm9,%xmm9
-	movq		0x28(%rdi),%xmm11
-	pshufd		$0x00,%xmm11,%xmm10
-	pshufd		$0x55,%xmm11,%xmm11
-	movq		0x30(%rdi),%xmm13
-	pshufd		$0x00,%xmm13,%xmm12
-	pshufd		$0x55,%xmm13,%xmm13
-	movq		0x38(%rdi),%xmm15
-	pshufd		$0x00,%xmm15,%xmm14
-	pshufd		$0x55,%xmm15,%xmm15
-	# x0..3 on stack
-	movdqa		%xmm0,0x00(%rsp)
-	movdqa		%xmm1,0x10(%rsp)
-	movdqa		%xmm2,0x20(%rsp)
-	movdqa		%xmm3,0x30(%rsp)
-
-	movdqa		CTRINC(%rip),%xmm1
-	movdqa		ROT8(%rip),%xmm2
-	movdqa		ROT16(%rip),%xmm3
-
-	# x12 += counter values 0-3
-	paddd		%xmm1,%xmm12
-
-	mov		$10,%ecx
-
-.Ldoubleround4:
-	# x0 += x4, x12 = rotl32(x12 ^ x0, 16)
-	movdqa		0x00(%rsp),%xmm0
-	paddd		%xmm4,%xmm0
-	movdqa		%xmm0,0x00(%rsp)
-	pxor		%xmm0,%xmm12
-	pshufb		%xmm3,%xmm12
-	# x1 += x5, x13 = rotl32(x13 ^ x1, 16)
-	movdqa		0x10(%rsp),%xmm0
-	paddd		%xmm5,%xmm0
-	movdqa		%xmm0,0x10(%rsp)
-	pxor		%xmm0,%xmm13
-	pshufb		%xmm3,%xmm13
-	# x2 += x6, x14 = rotl32(x14 ^ x2, 16)
-	movdqa		0x20(%rsp),%xmm0
-	paddd		%xmm6,%xmm0
-	movdqa		%xmm0,0x20(%rsp)
-	pxor		%xmm0,%xmm14
-	pshufb		%xmm3,%xmm14
-	# x3 += x7, x15 = rotl32(x15 ^ x3, 16)
-	movdqa		0x30(%rsp),%xmm0
-	paddd		%xmm7,%xmm0
-	movdqa		%xmm0,0x30(%rsp)
-	pxor		%xmm0,%xmm15
-	pshufb		%xmm3,%xmm15
-
-	# x8 += x12, x4 = rotl32(x4 ^ x8, 12)
-	paddd		%xmm12,%xmm8
-	pxor		%xmm8,%xmm4
-	movdqa		%xmm4,%xmm0
-	pslld		$12,%xmm0
-	psrld		$20,%xmm4
-	por		%xmm0,%xmm4
-	# x9 += x13, x5 = rotl32(x5 ^ x9, 12)
-	paddd		%xmm13,%xmm9
-	pxor		%xmm9,%xmm5
-	movdqa		%xmm5,%xmm0
-	pslld		$12,%xmm0
-	psrld		$20,%xmm5
-	por		%xmm0,%xmm5
-	# x10 += x14, x6 = rotl32(x6 ^ x10, 12)
-	paddd		%xmm14,%xmm10
-	pxor		%xmm10,%xmm6
-	movdqa		%xmm6,%xmm0
-	pslld		$12,%xmm0
-	psrld		$20,%xmm6
-	por		%xmm0,%xmm6
-	# x11 += x15, x7 = rotl32(x7 ^ x11, 12)
-	paddd		%xmm15,%xmm11
-	pxor		%xmm11,%xmm7
-	movdqa		%xmm7,%xmm0
-	pslld		$12,%xmm0
-	psrld		$20,%xmm7
-	por		%xmm0,%xmm7
-
-	# x0 += x4, x12 = rotl32(x12 ^ x0, 8)
-	movdqa		0x00(%rsp),%xmm0
-	paddd		%xmm4,%xmm0
-	movdqa		%xmm0,0x00(%rsp)
-	pxor		%xmm0,%xmm12
-	pshufb		%xmm2,%xmm12
-	# x1 += x5, x13 = rotl32(x13 ^ x1, 8)
-	movdqa		0x10(%rsp),%xmm0
-	paddd		%xmm5,%xmm0
-	movdqa		%xmm0,0x10(%rsp)
-	pxor		%xmm0,%xmm13
-	pshufb		%xmm2,%xmm13
-	# x2 += x6, x14 = rotl32(x14 ^ x2, 8)
-	movdqa		0x20(%rsp),%xmm0
-	paddd		%xmm6,%xmm0
-	movdqa		%xmm0,0x20(%rsp)
-	pxor		%xmm0,%xmm14
-	pshufb		%xmm2,%xmm14
-	# x3 += x7, x15 = rotl32(x15 ^ x3, 8)
-	movdqa		0x30(%rsp),%xmm0
-	paddd		%xmm7,%xmm0
-	movdqa		%xmm0,0x30(%rsp)
-	pxor		%xmm0,%xmm15
-	pshufb		%xmm2,%xmm15
-
-	# x8 += x12, x4 = rotl32(x4 ^ x8, 7)
-	paddd		%xmm12,%xmm8
-	pxor		%xmm8,%xmm4
-	movdqa		%xmm4,%xmm0
-	pslld		$7,%xmm0
-	psrld		$25,%xmm4
-	por		%xmm0,%xmm4
-	# x9 += x13, x5 = rotl32(x5 ^ x9, 7)
-	paddd		%xmm13,%xmm9
-	pxor		%xmm9,%xmm5
-	movdqa		%xmm5,%xmm0
-	pslld		$7,%xmm0
-	psrld		$25,%xmm5
-	por		%xmm0,%xmm5
-	# x10 += x14, x6 = rotl32(x6 ^ x10, 7)
-	paddd		%xmm14,%xmm10
-	pxor		%xmm10,%xmm6
-	movdqa		%xmm6,%xmm0
-	pslld		$7,%xmm0
-	psrld		$25,%xmm6
-	por		%xmm0,%xmm6
-	# x11 += x15, x7 = rotl32(x7 ^ x11, 7)
-	paddd		%xmm15,%xmm11
-	pxor		%xmm11,%xmm7
-	movdqa		%xmm7,%xmm0
-	pslld		$7,%xmm0
-	psrld		$25,%xmm7
-	por		%xmm0,%xmm7
-
-	# x0 += x5, x15 = rotl32(x15 ^ x0, 16)
-	movdqa		0x00(%rsp),%xmm0
-	paddd		%xmm5,%xmm0
-	movdqa		%xmm0,0x00(%rsp)
-	pxor		%xmm0,%xmm15
-	pshufb		%xmm3,%xmm15
-	# x1 += x6, x12 = rotl32(x12 ^ x1, 16)
-	movdqa		0x10(%rsp),%xmm0
-	paddd		%xmm6,%xmm0
-	movdqa		%xmm0,0x10(%rsp)
-	pxor		%xmm0,%xmm12
-	pshufb		%xmm3,%xmm12
-	# x2 += x7, x13 = rotl32(x13 ^ x2, 16)
-	movdqa		0x20(%rsp),%xmm0
-	paddd		%xmm7,%xmm0
-	movdqa		%xmm0,0x20(%rsp)
-	pxor		%xmm0,%xmm13
-	pshufb		%xmm3,%xmm13
-	# x3 += x4, x14 = rotl32(x14 ^ x3, 16)
-	movdqa		0x30(%rsp),%xmm0
-	paddd		%xmm4,%xmm0
-	movdqa		%xmm0,0x30(%rsp)
-	pxor		%xmm0,%xmm14
-	pshufb		%xmm3,%xmm14
-
-	# x10 += x15, x5 = rotl32(x5 ^ x10, 12)
-	paddd		%xmm15,%xmm10
-	pxor		%xmm10,%xmm5
-	movdqa		%xmm5,%xmm0
-	pslld		$12,%xmm0
-	psrld		$20,%xmm5
-	por		%xmm0,%xmm5
-	# x11 += x12, x6 = rotl32(x6 ^ x11, 12)
-	paddd		%xmm12,%xmm11
-	pxor		%xmm11,%xmm6
-	movdqa		%xmm6,%xmm0
-	pslld		$12,%xmm0
-	psrld		$20,%xmm6
-	por		%xmm0,%xmm6
-	# x8 += x13, x7 = rotl32(x7 ^ x8, 12)
-	paddd		%xmm13,%xmm8
-	pxor		%xmm8,%xmm7
-	movdqa		%xmm7,%xmm0
-	pslld		$12,%xmm0
-	psrld		$20,%xmm7
-	por		%xmm0,%xmm7
-	# x9 += x14, x4 = rotl32(x4 ^ x9, 12)
-	paddd		%xmm14,%xmm9
-	pxor		%xmm9,%xmm4
-	movdqa		%xmm4,%xmm0
-	pslld		$12,%xmm0
-	psrld		$20,%xmm4
-	por		%xmm0,%xmm4
-
-	# x0 += x5, x15 = rotl32(x15 ^ x0, 8)
-	movdqa		0x00(%rsp),%xmm0
-	paddd		%xmm5,%xmm0
-	movdqa		%xmm0,0x00(%rsp)
-	pxor		%xmm0,%xmm15
-	pshufb		%xmm2,%xmm15
-	# x1 += x6, x12 = rotl32(x12 ^ x1, 8)
-	movdqa		0x10(%rsp),%xmm0
-	paddd		%xmm6,%xmm0
-	movdqa		%xmm0,0x10(%rsp)
-	pxor		%xmm0,%xmm12
-	pshufb		%xmm2,%xmm12
-	# x2 += x7, x13 = rotl32(x13 ^ x2, 8)
-	movdqa		0x20(%rsp),%xmm0
-	paddd		%xmm7,%xmm0
-	movdqa		%xmm0,0x20(%rsp)
-	pxor		%xmm0,%xmm13
-	pshufb		%xmm2,%xmm13
-	# x3 += x4, x14 = rotl32(x14 ^ x3, 8)
-	movdqa		0x30(%rsp),%xmm0
-	paddd		%xmm4,%xmm0
-	movdqa		%xmm0,0x30(%rsp)
-	pxor		%xmm0,%xmm14
-	pshufb		%xmm2,%xmm14
-
-	# x10 += x15, x5 = rotl32(x5 ^ x10, 7)
-	paddd		%xmm15,%xmm10
-	pxor		%xmm10,%xmm5
-	movdqa		%xmm5,%xmm0
-	pslld		$7,%xmm0
-	psrld		$25,%xmm5
-	por		%xmm0,%xmm5
-	# x11 += x12, x6 = rotl32(x6 ^ x11, 7)
-	paddd		%xmm12,%xmm11
-	pxor		%xmm11,%xmm6
-	movdqa		%xmm6,%xmm0
-	pslld		$7,%xmm0
-	psrld		$25,%xmm6
-	por		%xmm0,%xmm6
-	# x8 += x13, x7 = rotl32(x7 ^ x8, 7)
-	paddd		%xmm13,%xmm8
-	pxor		%xmm8,%xmm7
-	movdqa		%xmm7,%xmm0
-	pslld		$7,%xmm0
-	psrld		$25,%xmm7
-	por		%xmm0,%xmm7
-	# x9 += x14, x4 = rotl32(x4 ^ x9, 7)
-	paddd		%xmm14,%xmm9
-	pxor		%xmm9,%xmm4
-	movdqa		%xmm4,%xmm0
-	pslld		$7,%xmm0
-	psrld		$25,%xmm4
-	por		%xmm0,%xmm4
-
-	dec		%ecx
-	jnz		.Ldoubleround4
-
-	# x0[0-3] += s0[0]
-	# x1[0-3] += s0[1]
-	movq		0x00(%rdi),%xmm3
-	pshufd		$0x00,%xmm3,%xmm2
-	pshufd		$0x55,%xmm3,%xmm3
-	paddd		0x00(%rsp),%xmm2
-	movdqa		%xmm2,0x00(%rsp)
-	paddd		0x10(%rsp),%xmm3
-	movdqa		%xmm3,0x10(%rsp)
-	# x2[0-3] += s0[2]
-	# x3[0-3] += s0[3]
-	movq		0x08(%rdi),%xmm3
-	pshufd		$0x00,%xmm3,%xmm2
-	pshufd		$0x55,%xmm3,%xmm3
-	paddd		0x20(%rsp),%xmm2
-	movdqa		%xmm2,0x20(%rsp)
-	paddd		0x30(%rsp),%xmm3
-	movdqa		%xmm3,0x30(%rsp)
-
-	# x4[0-3] += s1[0]
-	# x5[0-3] += s1[1]
-	movq		0x10(%rdi),%xmm3
-	pshufd		$0x00,%xmm3,%xmm2
-	pshufd		$0x55,%xmm3,%xmm3
-	paddd		%xmm2,%xmm4
-	paddd		%xmm3,%xmm5
-	# x6[0-3] += s1[2]
-	# x7[0-3] += s1[3]
-	movq		0x18(%rdi),%xmm3
-	pshufd		$0x00,%xmm3,%xmm2
-	pshufd		$0x55,%xmm3,%xmm3
-	paddd		%xmm2,%xmm6
-	paddd		%xmm3,%xmm7
-
-	# x8[0-3] += s2[0]
-	# x9[0-3] += s2[1]
-	movq		0x20(%rdi),%xmm3
-	pshufd		$0x00,%xmm3,%xmm2
-	pshufd		$0x55,%xmm3,%xmm3
-	paddd		%xmm2,%xmm8
-	paddd		%xmm3,%xmm9
-	# x10[0-3] += s2[2]
-	# x11[0-3] += s2[3]
-	movq		0x28(%rdi),%xmm3
-	pshufd		$0x00,%xmm3,%xmm2
-	pshufd		$0x55,%xmm3,%xmm3
-	paddd		%xmm2,%xmm10
-	paddd		%xmm3,%xmm11
-
-	# x12[0-3] += s3[0]
-	# x13[0-3] += s3[1]
-	movq		0x30(%rdi),%xmm3
-	pshufd		$0x00,%xmm3,%xmm2
-	pshufd		$0x55,%xmm3,%xmm3
-	paddd		%xmm2,%xmm12
-	paddd		%xmm3,%xmm13
-	# x14[0-3] += s3[2]
-	# x15[0-3] += s3[3]
-	movq		0x38(%rdi),%xmm3
-	pshufd		$0x00,%xmm3,%xmm2
-	pshufd		$0x55,%xmm3,%xmm3
-	paddd		%xmm2,%xmm14
-	paddd		%xmm3,%xmm15
-
-	# x12 += counter values 0-3
-	paddd		%xmm1,%xmm12
-
-	# interleave 32-bit words in state n, n+1
-	movdqa		0x00(%rsp),%xmm0
-	movdqa		0x10(%rsp),%xmm1
-	movdqa		%xmm0,%xmm2
-	punpckldq	%xmm1,%xmm2
-	punpckhdq	%xmm1,%xmm0
-	movdqa		%xmm2,0x00(%rsp)
-	movdqa		%xmm0,0x10(%rsp)
-	movdqa		0x20(%rsp),%xmm0
-	movdqa		0x30(%rsp),%xmm1
-	movdqa		%xmm0,%xmm2
-	punpckldq	%xmm1,%xmm2
-	punpckhdq	%xmm1,%xmm0
-	movdqa		%xmm2,0x20(%rsp)
-	movdqa		%xmm0,0x30(%rsp)
-	movdqa		%xmm4,%xmm0
-	punpckldq	%xmm5,%xmm4
-	punpckhdq	%xmm5,%xmm0
-	movdqa		%xmm0,%xmm5
-	movdqa		%xmm6,%xmm0
-	punpckldq	%xmm7,%xmm6
-	punpckhdq	%xmm7,%xmm0
-	movdqa		%xmm0,%xmm7
-	movdqa		%xmm8,%xmm0
-	punpckldq	%xmm9,%xmm8
-	punpckhdq	%xmm9,%xmm0
-	movdqa		%xmm0,%xmm9
-	movdqa		%xmm10,%xmm0
-	punpckldq	%xmm11,%xmm10
-	punpckhdq	%xmm11,%xmm0
-	movdqa		%xmm0,%xmm11
-	movdqa		%xmm12,%xmm0
-	punpckldq	%xmm13,%xmm12
-	punpckhdq	%xmm13,%xmm0
-	movdqa		%xmm0,%xmm13
-	movdqa		%xmm14,%xmm0
-	punpckldq	%xmm15,%xmm14
-	punpckhdq	%xmm15,%xmm0
-	movdqa		%xmm0,%xmm15
-
-	# interleave 64-bit words in state n, n+2
-	movdqa		0x00(%rsp),%xmm0
-	movdqa		0x20(%rsp),%xmm1
-	movdqa		%xmm0,%xmm2
-	punpcklqdq	%xmm1,%xmm2
-	punpckhqdq	%xmm1,%xmm0
-	movdqa		%xmm2,0x00(%rsp)
-	movdqa		%xmm0,0x20(%rsp)
-	movdqa		0x10(%rsp),%xmm0
-	movdqa		0x30(%rsp),%xmm1
-	movdqa		%xmm0,%xmm2
-	punpcklqdq	%xmm1,%xmm2
-	punpckhqdq	%xmm1,%xmm0
-	movdqa		%xmm2,0x10(%rsp)
-	movdqa		%xmm0,0x30(%rsp)
-	movdqa		%xmm4,%xmm0
-	punpcklqdq	%xmm6,%xmm4
-	punpckhqdq	%xmm6,%xmm0
-	movdqa		%xmm0,%xmm6
-	movdqa		%xmm5,%xmm0
-	punpcklqdq	%xmm7,%xmm5
-	punpckhqdq	%xmm7,%xmm0
-	movdqa		%xmm0,%xmm7
-	movdqa		%xmm8,%xmm0
-	punpcklqdq	%xmm10,%xmm8
-	punpckhqdq	%xmm10,%xmm0
-	movdqa		%xmm0,%xmm10
-	movdqa		%xmm9,%xmm0
-	punpcklqdq	%xmm11,%xmm9
-	punpckhqdq	%xmm11,%xmm0
-	movdqa		%xmm0,%xmm11
-	movdqa		%xmm12,%xmm0
-	punpcklqdq	%xmm14,%xmm12
-	punpckhqdq	%xmm14,%xmm0
-	movdqa		%xmm0,%xmm14
-	movdqa		%xmm13,%xmm0
-	punpcklqdq	%xmm15,%xmm13
-	punpckhqdq	%xmm15,%xmm0
-	movdqa		%xmm0,%xmm15
-
-	# xor with corresponding input, write to output
-	movdqa		0x00(%rsp),%xmm0
-	cmp		$0x10,%rax
-	jl		.Lxorpart4
-	movdqu		0x00(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x00(%rsi)
-
-	movdqu		%xmm4,%xmm0
-	cmp		$0x20,%rax
-	jl		.Lxorpart4
-	movdqu		0x10(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x10(%rsi)
-
-	movdqu		%xmm8,%xmm0
-	cmp		$0x30,%rax
-	jl		.Lxorpart4
-	movdqu		0x20(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x20(%rsi)
-
-	movdqu		%xmm12,%xmm0
-	cmp		$0x40,%rax
-	jl		.Lxorpart4
-	movdqu		0x30(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x30(%rsi)
-
-	movdqa		0x20(%rsp),%xmm0
-	cmp		$0x50,%rax
-	jl		.Lxorpart4
-	movdqu		0x40(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x40(%rsi)
-
-	movdqu		%xmm6,%xmm0
-	cmp		$0x60,%rax
-	jl		.Lxorpart4
-	movdqu		0x50(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x50(%rsi)
-
-	movdqu		%xmm10,%xmm0
-	cmp		$0x70,%rax
-	jl		.Lxorpart4
-	movdqu		0x60(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x60(%rsi)
-
-	movdqu		%xmm14,%xmm0
-	cmp		$0x80,%rax
-	jl		.Lxorpart4
-	movdqu		0x70(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x70(%rsi)
-
-	movdqa		0x10(%rsp),%xmm0
-	cmp		$0x90,%rax
-	jl		.Lxorpart4
-	movdqu		0x80(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x80(%rsi)
-
-	movdqu		%xmm5,%xmm0
-	cmp		$0xa0,%rax
-	jl		.Lxorpart4
-	movdqu		0x90(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0x90(%rsi)
-
-	movdqu		%xmm9,%xmm0
-	cmp		$0xb0,%rax
-	jl		.Lxorpart4
-	movdqu		0xa0(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0xa0(%rsi)
-
-	movdqu		%xmm13,%xmm0
-	cmp		$0xc0,%rax
-	jl		.Lxorpart4
-	movdqu		0xb0(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0xb0(%rsi)
-
-	movdqa		0x30(%rsp),%xmm0
-	cmp		$0xd0,%rax
-	jl		.Lxorpart4
-	movdqu		0xc0(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0xc0(%rsi)
-
-	movdqu		%xmm7,%xmm0
-	cmp		$0xe0,%rax
-	jl		.Lxorpart4
-	movdqu		0xd0(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0xd0(%rsi)
-
-	movdqu		%xmm11,%xmm0
-	cmp		$0xf0,%rax
-	jl		.Lxorpart4
-	movdqu		0xe0(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0xe0(%rsi)
-
-	movdqu		%xmm15,%xmm0
-	cmp		$0x100,%rax
-	jl		.Lxorpart4
-	movdqu		0xf0(%rdx),%xmm1
-	pxor		%xmm1,%xmm0
-	movdqu		%xmm0,0xf0(%rsi)
-
-.Ldone4:
-	lea		-8(%r10),%rsp
-	ret
-
-.Lxorpart4:
-	# xor remaining bytes from partial register into output
-	mov		%rax,%r9
-	and		$0x0f,%r9
-	jz		.Ldone4
-	and		$~0x0f,%rax
-
-	mov		%rsi,%r11
-
-	lea		(%rdx,%rax),%rsi
-	mov		%rsp,%rdi
-	mov		%r9,%rcx
-	rep movsb
-
-	pxor		0x00(%rsp),%xmm0
-	movdqa		%xmm0,0x00(%rsp)
-
-	mov		%rsp,%rsi
-	lea		(%r11,%rax),%rdi
-	mov		%r9,%rcx
-	rep movsb
-
-	jmp		.Ldone4
-
-ENDPROC(chacha20_4block_xor_ssse3)