Revert "crypto: arm64/ARM: NEON accelerated ChaCha20"

This patch reverts the following commits:

8621caa0d45e731f2e9f5889ff5bb384fcd6e059
8096667273477e735b0072b11a6d617ccee45e5f

I should not have applied them because they had already been
obsoleted by a subsequent patch series.  They also cause a build
failure because of the subsequent commit 9ae433bc79f9.

Fixes: 9ae433bc79f ("crypto: chacha20 - convert generic and...")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

4 files changed, 0 insertions, 620 deletions

diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig
index 0bf0f531f539..450a85df041a 100644
--- a/arch/arm64/crypto/Kconfig
+++ b/arch/arm64/crypto/Kconfig
@@ -72,10 +72,4 @@ config CRYPTO_CRC32_ARM64
 	depends on ARM64
 	select CRYPTO_HASH
 
-config CRYPTO_CHACHA20_NEON
-	tristate "NEON accelerated ChaCha20 symmetric cipher"
-	depends on KERNEL_MODE_NEON
-	select CRYPTO_BLKCIPHER
-	select CRYPTO_CHACHA20
-
 endif
diff --git a/arch/arm64/crypto/Makefile b/arch/arm64/crypto/Makefile
index 9d2826c5fccf..aa8888d7b744 100644
--- a/arch/arm64/crypto/Makefile
+++ b/arch/arm64/crypto/Makefile
@@ -41,9 +41,6 @@ sha256-arm64-y := sha256-glue.o sha256-core.o
 obj-$(CONFIG_CRYPTO_SHA512_ARM64) += sha512-arm64.o
 sha512-arm64-y := sha512-glue.o sha512-core.o
 
-obj-$(CONFIG_CRYPTO_CHACHA20_NEON) += chacha20-neon.o
-chacha20-neon-y := chacha20-neon-core.o chacha20-neon-glue.o
-
 AFLAGS_aes-ce.o		:= -DINTERLEAVE=4
 AFLAGS_aes-neon.o	:= -DINTERLEAVE=4
 
diff --git a/arch/arm64/crypto/chacha20-neon-core.S b/arch/arm64/crypto/chacha20-neon-core.S
deleted file mode 100644
index e2cd65580807..000000000000
--- a/arch/arm64/crypto/chacha20-neon-core.S
+++ /dev/null
@@ -1,480 +0,0 @@
-/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, arm64 NEON functions
- *
- * Copyright (C) 2016 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.
- *
- * Based on:
- * 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>
-
-	.text
-	.align		6
-
-ENTRY(chacha20_block_xor_neon)
-	// x0: Input state matrix, s
-	// x1: 1 data block output, o
-	// x2: 1 data block input, i
-
-	//
-	// This function encrypts one ChaCha20 block by loading the state matrix
-	// in four NEON registers. It performs matrix operation on four words in
-	// parallel, but requires shuffling to rearrange the words after each
-	// round.
-	//
-
-	// x0..3 = s0..3
-	ld1		{v0.4s-v3.4s}, [x0]
-	ld1		{v8.4s-v11.4s}, [x0]
-
-	mov		x3, #10
-
-.Ldoubleround:
-	// x0 += x1, x3 = rotl32(x3 ^ x0, 16)
-	add		v0.4s, v0.4s, v1.4s
-	eor		v3.16b, v3.16b, v0.16b
-	rev32		v3.8h, v3.8h
-
-	// x2 += x3, x1 = rotl32(x1 ^ x2, 12)
-	add		v2.4s, v2.4s, v3.4s
-	eor		v4.16b, v1.16b, v2.16b
-	shl		v1.4s, v4.4s, #12
-	sri		v1.4s, v4.4s, #20
-
-	// x0 += x1, x3 = rotl32(x3 ^ x0, 8)
-	add		v0.4s, v0.4s, v1.4s
-	eor		v4.16b, v3.16b, v0.16b
-	shl		v3.4s, v4.4s, #8
-	sri		v3.4s, v4.4s, #24
-
-	// x2 += x3, x1 = rotl32(x1 ^ x2, 7)
-	add		v2.4s, v2.4s, v3.4s
-	eor		v4.16b, v1.16b, v2.16b
-	shl		v1.4s, v4.4s, #7
-	sri		v1.4s, v4.4s, #25
-
-	// x1 = shuffle32(x1, MASK(0, 3, 2, 1))
-	ext		v1.16b, v1.16b, v1.16b, #4
-	// x2 = shuffle32(x2, MASK(1, 0, 3, 2))
-	ext		v2.16b, v2.16b, v2.16b, #8
-	// x3 = shuffle32(x3, MASK(2, 1, 0, 3))
-	ext		v3.16b, v3.16b, v3.16b, #12
-
-	// x0 += x1, x3 = rotl32(x3 ^ x0, 16)
-	add		v0.4s, v0.4s, v1.4s
-	eor		v3.16b, v3.16b, v0.16b
-	rev32		v3.8h, v3.8h
-
-	// x2 += x3, x1 = rotl32(x1 ^ x2, 12)
-	add		v2.4s, v2.4s, v3.4s
-	eor		v4.16b, v1.16b, v2.16b
-	shl		v1.4s, v4.4s, #12
-	sri		v1.4s, v4.4s, #20
-
-	// x0 += x1, x3 = rotl32(x3 ^ x0, 8)
-	add		v0.4s, v0.4s, v1.4s
-	eor		v4.16b, v3.16b, v0.16b
-	shl		v3.4s, v4.4s, #8
-	sri		v3.4s, v4.4s, #24
-
-	// x2 += x3, x1 = rotl32(x1 ^ x2, 7)
-	add		v2.4s, v2.4s, v3.4s
-	eor		v4.16b, v1.16b, v2.16b
-	shl		v1.4s, v4.4s, #7
-	sri		v1.4s, v4.4s, #25
-
-	// x1 = shuffle32(x1, MASK(2, 1, 0, 3))
-	ext		v1.16b, v1.16b, v1.16b, #12
-	// x2 = shuffle32(x2, MASK(1, 0, 3, 2))
-	ext		v2.16b, v2.16b, v2.16b, #8
-	// x3 = shuffle32(x3, MASK(0, 3, 2, 1))
-	ext		v3.16b, v3.16b, v3.16b, #4
-
-	subs		x3, x3, #1
-	b.ne		.Ldoubleround
-
-	ld1		{v4.16b-v7.16b}, [x2]
-
-	// o0 = i0 ^ (x0 + s0)
-	add		v0.4s, v0.4s, v8.4s
-	eor		v0.16b, v0.16b, v4.16b
-
-	// o1 = i1 ^ (x1 + s1)
-	add		v1.4s, v1.4s, v9.4s
-	eor		v1.16b, v1.16b, v5.16b
-
-	// o2 = i2 ^ (x2 + s2)
-	add		v2.4s, v2.4s, v10.4s
-	eor		v2.16b, v2.16b, v6.16b
-
-	// o3 = i3 ^ (x3 + s3)
-	add		v3.4s, v3.4s, v11.4s
-	eor		v3.16b, v3.16b, v7.16b
-
-	st1		{v0.16b-v3.16b}, [x1]
-
-	ret
-ENDPROC(chacha20_block_xor_neon)
-
-	.align		6
-ENTRY(chacha20_4block_xor_neon)
-	// x0: Input state matrix, s
-	// x1: 4 data blocks output, o
-	// x2: 4 data blocks input, i
-
-	//
-	// This function encrypts four consecutive ChaCha20 blocks by loading
-	// the state matrix in NEON registers four times. 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 NEON registers.
-	//
-	adr		x3, CTRINC
-	ld1		{v16.4s}, [x3]
-
-	// x0..15[0-3] = s0..3[0..3]
-	mov		x4, x0
-	ld4r		{ v0.4s- v3.4s}, [x4], #16
-	ld4r		{ v4.4s- v7.4s}, [x4], #16
-	ld4r		{ v8.4s-v11.4s}, [x4], #16
-	ld4r		{v12.4s-v15.4s}, [x4]
-
-	// x12 += counter values 0-3
-	add		v12.4s, v12.4s, v16.4s
-
-	mov		x3, #10
-
-.Ldoubleround4:
-	// x0 += x4, x12 = rotl32(x12 ^ x0, 16)
-	// x1 += x5, x13 = rotl32(x13 ^ x1, 16)
-	// x2 += x6, x14 = rotl32(x14 ^ x2, 16)
-	// x3 += x7, x15 = rotl32(x15 ^ x3, 16)
-	add		v0.4s, v0.4s, v4.4s
-	add		v1.4s, v1.4s, v5.4s
-	add		v2.4s, v2.4s, v6.4s
-	add		v3.4s, v3.4s, v7.4s
-
-	eor		v12.16b, v12.16b, v0.16b
-	eor		v13.16b, v13.16b, v1.16b
-	eor		v14.16b, v14.16b, v2.16b
-	eor		v15.16b, v15.16b, v3.16b
-
-	rev32		v12.8h, v12.8h
-	rev32		v13.8h, v13.8h
-	rev32		v14.8h, v14.8h
-	rev32		v15.8h, v15.8h
-
-	// x8 += x12, x4 = rotl32(x4 ^ x8, 12)
-	// x9 += x13, x5 = rotl32(x5 ^ x9, 12)
-	// x10 += x14, x6 = rotl32(x6 ^ x10, 12)
-	// x11 += x15, x7 = rotl32(x7 ^ x11, 12)
-	add		v8.4s, v8.4s, v12.4s
-	add		v9.4s, v9.4s, v13.4s
-	add		v10.4s, v10.4s, v14.4s
-	add		v11.4s, v11.4s, v15.4s
-
-	eor		v17.16b, v4.16b, v8.16b
-	eor		v18.16b, v5.16b, v9.16b
-	eor		v19.16b, v6.16b, v10.16b
-	eor		v20.16b, v7.16b, v11.16b
-
-	shl		v4.4s, v17.4s, #12
-	shl		v5.4s, v18.4s, #12
-	shl		v6.4s, v19.4s, #12
-	shl		v7.4s, v20.4s, #12
-
-	sri		v4.4s, v17.4s, #20
-	sri		v5.4s, v18.4s, #20
-	sri		v6.4s, v19.4s, #20
-	sri		v7.4s, v20.4s, #20
-
-	// x0 += x4, x12 = rotl32(x12 ^ x0, 8)
-	// x1 += x5, x13 = rotl32(x13 ^ x1, 8)
-	// x2 += x6, x14 = rotl32(x14 ^ x2, 8)
-	// x3 += x7, x15 = rotl32(x15 ^ x3, 8)
-	add		v0.4s, v0.4s, v4.4s
-	add		v1.4s, v1.4s, v5.4s
-	add		v2.4s, v2.4s, v6.4s
-	add		v3.4s, v3.4s, v7.4s
-
-	eor		v17.16b, v12.16b, v0.16b
-	eor		v18.16b, v13.16b, v1.16b
-	eor		v19.16b, v14.16b, v2.16b
-	eor		v20.16b, v15.16b, v3.16b
-
-	shl		v12.4s, v17.4s, #8
-	shl		v13.4s, v18.4s, #8
-	shl		v14.4s, v19.4s, #8
-	shl		v15.4s, v20.4s, #8
-
-	sri		v12.4s, v17.4s, #24
-	sri		v13.4s, v18.4s, #24
-	sri		v14.4s, v19.4s, #24
-	sri		v15.4s, v20.4s, #24
-
-	// x8 += x12, x4 = rotl32(x4 ^ x8, 7)
-	// x9 += x13, x5 = rotl32(x5 ^ x9, 7)
-	// x10 += x14, x6 = rotl32(x6 ^ x10, 7)
-	// x11 += x15, x7 = rotl32(x7 ^ x11, 7)
-	add		v8.4s, v8.4s, v12.4s
-	add		v9.4s, v9.4s, v13.4s
-	add		v10.4s, v10.4s, v14.4s
-	add		v11.4s, v11.4s, v15.4s
-
-	eor		v17.16b, v4.16b, v8.16b
-	eor		v18.16b, v5.16b, v9.16b
-	eor		v19.16b, v6.16b, v10.16b
-	eor		v20.16b, v7.16b, v11.16b
-
-	shl		v4.4s, v17.4s, #7
-	shl		v5.4s, v18.4s, #7
-	shl		v6.4s, v19.4s, #7
-	shl		v7.4s, v20.4s, #7
-
-	sri		v4.4s, v17.4s, #25
-	sri		v5.4s, v18.4s, #25
-	sri		v6.4s, v19.4s, #25
-	sri		v7.4s, v20.4s, #25
-
-	// x0 += x5, x15 = rotl32(x15 ^ x0, 16)
-	// x1 += x6, x12 = rotl32(x12 ^ x1, 16)
-	// x2 += x7, x13 = rotl32(x13 ^ x2, 16)
-	// x3 += x4, x14 = rotl32(x14 ^ x3, 16)
-	add		v0.4s, v0.4s, v5.4s
-	add		v1.4s, v1.4s, v6.4s
-	add		v2.4s, v2.4s, v7.4s
-	add		v3.4s, v3.4s, v4.4s
-
-	eor		v15.16b, v15.16b, v0.16b
-	eor		v12.16b, v12.16b, v1.16b
-	eor		v13.16b, v13.16b, v2.16b
-	eor		v14.16b, v14.16b, v3.16b
-
-	rev32		v15.8h, v15.8h
-	rev32		v12.8h, v12.8h
-	rev32		v13.8h, v13.8h
-	rev32		v14.8h, v14.8h
-
-	// x10 += x15, x5 = rotl32(x5 ^ x10, 12)
-	// x11 += x12, x6 = rotl32(x6 ^ x11, 12)
-	// x8 += x13, x7 = rotl32(x7 ^ x8, 12)
-	// x9 += x14, x4 = rotl32(x4 ^ x9, 12)
-	add		v10.4s, v10.4s, v15.4s
-	add		v11.4s, v11.4s, v12.4s
-	add		v8.4s, v8.4s, v13.4s
-	add		v9.4s, v9.4s, v14.4s
-
-	eor		v17.16b, v5.16b, v10.16b
-	eor		v18.16b, v6.16b, v11.16b
-	eor		v19.16b, v7.16b, v8.16b
-	eor		v20.16b, v4.16b, v9.16b
-
-	shl		v5.4s, v17.4s, #12
-	shl		v6.4s, v18.4s, #12
-	shl		v7.4s, v19.4s, #12
-	shl		v4.4s, v20.4s, #12
-
-	sri		v5.4s, v17.4s, #20
-	sri		v6.4s, v18.4s, #20
-	sri		v7.4s, v19.4s, #20
-	sri		v4.4s, v20.4s, #20
-
-	// x0 += x5, x15 = rotl32(x15 ^ x0, 8)
-	// x1 += x6, x12 = rotl32(x12 ^ x1, 8)
-	// x2 += x7, x13 = rotl32(x13 ^ x2, 8)
-	// x3 += x4, x14 = rotl32(x14 ^ x3, 8)
-	add		v0.4s, v0.4s, v5.4s
-	add		v1.4s, v1.4s, v6.4s
-	add		v2.4s, v2.4s, v7.4s
-	add		v3.4s, v3.4s, v4.4s
-
-	eor		v17.16b, v15.16b, v0.16b
-	eor		v18.16b, v12.16b, v1.16b
-	eor		v19.16b, v13.16b, v2.16b
-	eor		v20.16b, v14.16b, v3.16b
-
-	shl		v15.4s, v17.4s, #8
-	shl		v12.4s, v18.4s, #8
-	shl		v13.4s, v19.4s, #8
-	shl		v14.4s, v20.4s, #8
-
-	sri		v15.4s, v17.4s, #24
-	sri		v12.4s, v18.4s, #24
-	sri		v13.4s, v19.4s, #24
-	sri		v14.4s, v20.4s, #24
-
-	// x10 += x15, x5 = rotl32(x5 ^ x10, 7)
-	// x11 += x12, x6 = rotl32(x6 ^ x11, 7)
-	// x8 += x13, x7 = rotl32(x7 ^ x8, 7)
-	// x9 += x14, x4 = rotl32(x4 ^ x9, 7)
-	add		v10.4s, v10.4s, v15.4s
-	add		v11.4s, v11.4s, v12.4s
-	add		v8.4s, v8.4s, v13.4s
-	add		v9.4s, v9.4s, v14.4s
-
-	eor		v17.16b, v5.16b, v10.16b
-	eor		v18.16b, v6.16b, v11.16b
-	eor		v19.16b, v7.16b, v8.16b
-	eor		v20.16b, v4.16b, v9.16b
-
-	shl		v5.4s, v17.4s, #7
-	shl		v6.4s, v18.4s, #7
-	shl		v7.4s, v19.4s, #7
-	shl		v4.4s, v20.4s, #7
-
-	sri		v5.4s, v17.4s, #25
-	sri		v6.4s, v18.4s, #25
-	sri		v7.4s, v19.4s, #25
-	sri		v4.4s, v20.4s, #25
-
-	subs		x3, x3, #1
-	b.ne		.Ldoubleround4
-
-	// x0[0-3] += s0[0]
-	// x1[0-3] += s0[1]
-	// x2[0-3] += s0[2]
-	// x3[0-3] += s0[3]
-	ld4r		{v17.4s-v20.4s}, [x0], #16
-	add		v0.4s, v0.4s, v17.4s
-	add		v1.4s, v1.4s, v18.4s
-	add		v2.4s, v2.4s, v19.4s
-	add		v3.4s, v3.4s, v20.4s
-
-	// x4[0-3] += s1[0]
-	// x5[0-3] += s1[1]
-	// x6[0-3] += s1[2]
-	// x7[0-3] += s1[3]
-	ld4r		{v21.4s-v24.4s}, [x0], #16
-	add		v4.4s, v4.4s, v21.4s
-	add		v5.4s, v5.4s, v22.4s
-	add		v6.4s, v6.4s, v23.4s
-	add		v7.4s, v7.4s, v24.4s
-
-	// x8[0-3] += s2[0]
-	// x9[0-3] += s2[1]
-	// x10[0-3] += s2[2]
-	// x11[0-3] += s2[3]
-	ld4r		{v17.4s-v20.4s}, [x0], #16
-	add		v8.4s, v8.4s, v17.4s
-	add		v9.4s, v9.4s, v18.4s
-	add		v10.4s, v10.4s, v19.4s
-	add		v11.4s, v11.4s, v20.4s
-
-	// x12[0-3] += s3[0]
-	// x13[0-3] += s3[1]
-	// x14[0-3] += s3[2]
-	// x15[0-3] += s3[3]
-	ld4r		{v21.4s-v24.4s}, [x0]
-	add		v12.4s, v12.4s, v21.4s
-	add		v13.4s, v13.4s, v22.4s
-	add		v14.4s, v14.4s, v23.4s
-	add		v15.4s, v15.4s, v24.4s
-
-	// x12 += counter values 0-3
-	add		v12.4s, v12.4s, v16.4s
-
-	ld1		{v16.16b-v19.16b}, [x2], #64
-	ld1		{v20.16b-v23.16b}, [x2], #64
-
-	// interleave 32-bit words in state n, n+1
-	zip1		v24.4s, v0.4s, v1.4s
-	zip1		v25.4s, v2.4s, v3.4s
-	zip1		v26.4s, v4.4s, v5.4s
-	zip1		v27.4s, v6.4s, v7.4s
-	zip1		v28.4s, v8.4s, v9.4s
-	zip1		v29.4s, v10.4s, v11.4s
-	zip1		v30.4s, v12.4s, v13.4s
-	zip1		v31.4s, v14.4s, v15.4s
-
-	zip2		v1.4s, v0.4s, v1.4s
-	zip2		v3.4s, v2.4s, v3.4s
-	zip2		v5.4s, v4.4s, v5.4s
-	zip2		v7.4s, v6.4s, v7.4s
-	zip2		v9.4s, v8.4s, v9.4s
-	zip2		v11.4s, v10.4s, v11.4s
-	zip2		v13.4s, v12.4s, v13.4s
-	zip2		v15.4s, v14.4s, v15.4s
-
-	mov		v0.16b, v24.16b
-	mov		v2.16b, v25.16b
-	mov		v4.16b, v26.16b
-	mov		v6.16b, v27.16b
-	mov		v8.16b, v28.16b
-	mov		v10.16b, v29.16b
-	mov		v12.16b, v30.16b
-	mov		v14.16b, v31.16b
-
-	// interleave 64-bit words in state n, n+2
-	zip1		v24.2d, v0.2d, v2.2d
-	zip1		v25.2d, v1.2d, v3.2d
-	zip1		v26.2d, v4.2d, v6.2d
-	zip1		v27.2d, v5.2d, v7.2d
-	zip1		v28.2d, v8.2d, v10.2d
-	zip1		v29.2d, v9.2d, v11.2d
-	zip1		v30.2d, v12.2d, v14.2d
-	zip1		v31.2d, v13.2d, v15.2d
-
-	zip2		v2.2d, v0.2d, v2.2d
-	zip2		v3.2d, v1.2d, v3.2d
-	zip2		v6.2d, v4.2d, v6.2d
-	zip2		v7.2d, v5.2d, v7.2d
-	zip2		v10.2d, v8.2d, v10.2d
-	zip2		v11.2d, v9.2d, v11.2d
-	zip2		v14.2d, v12.2d, v14.2d
-	zip2		v15.2d, v13.2d, v15.2d
-
-	mov		v0.16b, v24.16b
-	mov		v1.16b, v25.16b
-	mov		v4.16b, v26.16b
-	mov		v5.16b, v27.16b
-
-	mov		v8.16b, v28.16b
-	mov		v9.16b, v29.16b
-	mov		v12.16b, v30.16b
-	mov		v13.16b, v31.16b
-
-	ld1		{v24.16b-v27.16b}, [x2], #64
-	ld1		{v28.16b-v31.16b}, [x2]
-
-	// xor with corresponding input, write to output
-	eor		v16.16b, v16.16b, v0.16b
-	eor		v17.16b, v17.16b, v4.16b
-	eor		v18.16b, v18.16b, v8.16b
-	eor		v19.16b, v19.16b, v12.16b
-	st1		{v16.16b-v19.16b}, [x1], #64
-
-	eor		v20.16b, v20.16b, v2.16b
-	eor		v21.16b, v21.16b, v6.16b
-	eor		v22.16b, v22.16b, v10.16b
-	eor		v23.16b, v23.16b, v14.16b
-	st1		{v20.16b-v23.16b}, [x1], #64
-
-	eor		v24.16b, v24.16b, v1.16b
-	eor		v25.16b, v25.16b, v5.16b
-	eor		v26.16b, v26.16b, v9.16b
-	eor		v27.16b, v27.16b, v13.16b
-	st1		{v24.16b-v27.16b}, [x1], #64
-
-	eor		v28.16b, v28.16b, v3.16b
-	eor		v29.16b, v29.16b, v7.16b
-	eor		v30.16b, v30.16b, v11.16b
-	eor		v31.16b, v31.16b, v15.16b
-	st1		{v28.16b-v31.16b}, [x1]
-
-	ret
-ENDPROC(chacha20_4block_xor_neon)
-
-CTRINC:	.word		0, 1, 2, 3
diff --git a/arch/arm64/crypto/chacha20-neon-glue.c b/arch/arm64/crypto/chacha20-neon-glue.c
deleted file mode 100644
index 705b42b06d00..000000000000
--- a/arch/arm64/crypto/chacha20-neon-glue.c
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
- * ChaCha20 256-bit cipher algorithm, RFC7539, arm64 NEON functions
- *
- * Copyright (C) 2016 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.
- *
- * Based on:
- * ChaCha20 256-bit cipher algorithm, RFC7539, SIMD glue code
- *
- * 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 <crypto/algapi.h>
-#include <crypto/chacha20.h>
-#include <linux/crypto.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-
-#include <asm/neon.h>
-
-asmlinkage void chacha20_block_xor_neon(u32 *state, u8 *dst, const u8 *src);
-asmlinkage void chacha20_4block_xor_neon(u32 *state, u8 *dst, const u8 *src);
-
-static void chacha20_dosimd(u32 *state, u8 *dst, const u8 *src,
-			    unsigned int bytes)
-{
-	u8 buf[CHACHA20_BLOCK_SIZE];
-
-	while (bytes >= CHACHA20_BLOCK_SIZE * 4) {
-		chacha20_4block_xor_neon(state, dst, src);
-		bytes -= CHACHA20_BLOCK_SIZE * 4;
-		src += CHACHA20_BLOCK_SIZE * 4;
-		dst += CHACHA20_BLOCK_SIZE * 4;
-		state[12] += 4;
-	}
-	while (bytes >= CHACHA20_BLOCK_SIZE) {
-		chacha20_block_xor_neon(state, dst, src);
-		bytes -= CHACHA20_BLOCK_SIZE;
-		src += CHACHA20_BLOCK_SIZE;
-		dst += CHACHA20_BLOCK_SIZE;
-		state[12]++;
-	}
-	if (bytes) {
-		memcpy(buf, src, bytes);
-		chacha20_block_xor_neon(state, buf, buf);
-		memcpy(dst, buf, bytes);
-	}
-}
-
-static int chacha20_simd(struct blkcipher_desc *desc, struct scatterlist *dst,
-			 struct scatterlist *src, unsigned int nbytes)
-{
-	struct blkcipher_walk walk;
-	u32 state[16];
-	int err;
-
-	if (nbytes <= CHACHA20_BLOCK_SIZE)
-		return crypto_chacha20_crypt(desc, dst, src, nbytes);
-
-	blkcipher_walk_init(&walk, dst, src, nbytes);
-	err = blkcipher_walk_virt_block(desc, &walk, CHACHA20_BLOCK_SIZE);
-
-	crypto_chacha20_init(state, crypto_blkcipher_ctx(desc->tfm), walk.iv);
-
-	kernel_neon_begin();
-
-	while (walk.nbytes >= CHACHA20_BLOCK_SIZE) {
-		chacha20_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr,
-				rounddown(walk.nbytes, CHACHA20_BLOCK_SIZE));
-		err = blkcipher_walk_done(desc, &walk,
-					  walk.nbytes % CHACHA20_BLOCK_SIZE);
-	}
-
-	if (walk.nbytes) {
-		chacha20_dosimd(state, walk.dst.virt.addr, walk.src.virt.addr,
-				walk.nbytes);
-		err = blkcipher_walk_done(desc, &walk, 0);
-	}
-
-	kernel_neon_end();
-
-	return err;
-}
-
-static struct crypto_alg alg = {
-	.cra_name		= "chacha20",
-	.cra_driver_name	= "chacha20-neon",
-	.cra_priority		= 300,
-	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
-	.cra_blocksize		= 1,
-	.cra_type		= &crypto_blkcipher_type,
-	.cra_ctxsize		= sizeof(struct chacha20_ctx),
-	.cra_alignmask		= sizeof(u32) - 1,
-	.cra_module		= THIS_MODULE,
-	.cra_u			= {
-		.blkcipher = {
-			.min_keysize	= CHACHA20_KEY_SIZE,
-			.max_keysize	= CHACHA20_KEY_SIZE,
-			.ivsize		= CHACHA20_IV_SIZE,
-			.geniv		= "seqiv",
-			.setkey		= crypto_chacha20_setkey,
-			.encrypt	= chacha20_simd,
-			.decrypt	= chacha20_simd,
-		},
-	},
-};
-
-static int __init chacha20_simd_mod_init(void)
-{
-	return crypto_register_alg(&alg);
-}
-
-static void __exit chacha20_simd_mod_fini(void)
-{
-	crypto_unregister_alg(&alg);
-}
-
-module_init(chacha20_simd_mod_init);
-module_exit(chacha20_simd_mod_fini);
-
-MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS_CRYPTO("chacha20");