arm64/crypto: AES-ECB/CBC/CTR/XTS using ARMv8 NEON and Crypto Extensions
This adds ARMv8 implementations of AES in ECB, CBC, CTR and XTS modes,
both for ARMv8 with Crypto Extensions and for plain ARMv8 NEON.
The Crypto Extensions version can only run on ARMv8 implementations that
have support for these optional extensions.
The plain NEON version is a table based yet time invariant implementation.
All S-box substitutions are performed in parallel, leveraging the wide range
of ARMv8's tbl/tbx instructions, and the huge NEON register file, which can
comfortably hold the entire S-box and still have room to spare for doing the
actual computations.
The key expansion routines were borrowed from aes_generic.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/arch/arm64/crypto/aes-neon.S b/arch/arm64/crypto/aes-neon.S
new file mode 100644
index 0000000..b93170e
--- /dev/null
+++ b/arch/arm64/crypto/aes-neon.S
@@ -0,0 +1,382 @@
+/*
+ * linux/arch/arm64/crypto/aes-neon.S - AES cipher for ARMv8 NEON
+ *
+ * Copyright (C) 2013 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>
+
+#define AES_ENTRY(func) ENTRY(neon_ ## func)
+#define AES_ENDPROC(func) ENDPROC(neon_ ## func)
+
+ /* multiply by polynomial 'x' in GF(2^8) */
+ .macro mul_by_x, out, in, temp, const
+ sshr \temp, \in, #7
+ add \out, \in, \in
+ and \temp, \temp, \const
+ eor \out, \out, \temp
+ .endm
+
+ /* preload the entire Sbox */
+ .macro prepare, sbox, shiftrows, temp
+ adr \temp, \sbox
+ movi v12.16b, #0x40
+ ldr q13, \shiftrows
+ movi v14.16b, #0x1b
+ ld1 {v16.16b-v19.16b}, [\temp], #64
+ ld1 {v20.16b-v23.16b}, [\temp], #64
+ ld1 {v24.16b-v27.16b}, [\temp], #64
+ ld1 {v28.16b-v31.16b}, [\temp]
+ .endm
+
+ /* do preload for encryption */
+ .macro enc_prepare, ignore0, ignore1, temp
+ prepare .LForward_Sbox, .LForward_ShiftRows, \temp
+ .endm
+
+ .macro enc_switch_key, ignore0, ignore1, temp
+ /* do nothing */
+ .endm
+
+ /* do preload for decryption */
+ .macro dec_prepare, ignore0, ignore1, temp
+ prepare .LReverse_Sbox, .LReverse_ShiftRows, \temp
+ .endm
+
+ /* apply SubBytes transformation using the the preloaded Sbox */
+ .macro sub_bytes, in
+ sub v9.16b, \in\().16b, v12.16b
+ tbl \in\().16b, {v16.16b-v19.16b}, \in\().16b
+ sub v10.16b, v9.16b, v12.16b
+ tbx \in\().16b, {v20.16b-v23.16b}, v9.16b
+ sub v11.16b, v10.16b, v12.16b
+ tbx \in\().16b, {v24.16b-v27.16b}, v10.16b
+ tbx \in\().16b, {v28.16b-v31.16b}, v11.16b
+ .endm
+
+ /* apply MixColumns transformation */
+ .macro mix_columns, in
+ mul_by_x v10.16b, \in\().16b, v9.16b, v14.16b
+ rev32 v8.8h, \in\().8h
+ eor \in\().16b, v10.16b, \in\().16b
+ shl v9.4s, v8.4s, #24
+ shl v11.4s, \in\().4s, #24
+ sri v9.4s, v8.4s, #8
+ sri v11.4s, \in\().4s, #8
+ eor v9.16b, v9.16b, v8.16b
+ eor v10.16b, v10.16b, v9.16b
+ eor \in\().16b, v10.16b, v11.16b
+ .endm
+
+ /* Inverse MixColumns: pre-multiply by { 5, 0, 4, 0 } */
+ .macro inv_mix_columns, in
+ mul_by_x v11.16b, \in\().16b, v10.16b, v14.16b
+ mul_by_x v11.16b, v11.16b, v10.16b, v14.16b
+ eor \in\().16b, \in\().16b, v11.16b
+ rev32 v11.8h, v11.8h
+ eor \in\().16b, \in\().16b, v11.16b
+ mix_columns \in
+ .endm
+
+ .macro do_block, enc, in, rounds, rk, rkp, i
+ ld1 {v15.16b}, [\rk]
+ add \rkp, \rk, #16
+ mov \i, \rounds
+1111: eor \in\().16b, \in\().16b, v15.16b /* ^round key */
+ tbl \in\().16b, {\in\().16b}, v13.16b /* ShiftRows */
+ sub_bytes \in
+ ld1 {v15.16b}, [\rkp], #16
+ subs \i, \i, #1
+ beq 2222f
+ .if \enc == 1
+ mix_columns \in
+ .else
+ inv_mix_columns \in
+ .endif
+ b 1111b
+2222: eor \in\().16b, \in\().16b, v15.16b /* ^round key */
+ .endm
+
+ .macro encrypt_block, in, rounds, rk, rkp, i
+ do_block 1, \in, \rounds, \rk, \rkp, \i
+ .endm
+
+ .macro decrypt_block, in, rounds, rk, rkp, i
+ do_block 0, \in, \rounds, \rk, \rkp, \i
+ .endm
+
+ /*
+ * Interleaved versions: functionally equivalent to the
+ * ones above, but applied to 2 or 4 AES states in parallel.
+ */
+
+ .macro sub_bytes_2x, in0, in1
+ sub v8.16b, \in0\().16b, v12.16b
+ sub v9.16b, \in1\().16b, v12.16b
+ tbl \in0\().16b, {v16.16b-v19.16b}, \in0\().16b
+ tbl \in1\().16b, {v16.16b-v19.16b}, \in1\().16b
+ sub v10.16b, v8.16b, v12.16b
+ sub v11.16b, v9.16b, v12.16b
+ tbx \in0\().16b, {v20.16b-v23.16b}, v8.16b
+ tbx \in1\().16b, {v20.16b-v23.16b}, v9.16b
+ sub v8.16b, v10.16b, v12.16b
+ sub v9.16b, v11.16b, v12.16b
+ tbx \in0\().16b, {v24.16b-v27.16b}, v10.16b
+ tbx \in1\().16b, {v24.16b-v27.16b}, v11.16b
+ tbx \in0\().16b, {v28.16b-v31.16b}, v8.16b
+ tbx \in1\().16b, {v28.16b-v31.16b}, v9.16b
+ .endm
+
+ .macro sub_bytes_4x, in0, in1, in2, in3
+ sub v8.16b, \in0\().16b, v12.16b
+ tbl \in0\().16b, {v16.16b-v19.16b}, \in0\().16b
+ sub v9.16b, \in1\().16b, v12.16b
+ tbl \in1\().16b, {v16.16b-v19.16b}, \in1\().16b
+ sub v10.16b, \in2\().16b, v12.16b
+ tbl \in2\().16b, {v16.16b-v19.16b}, \in2\().16b
+ sub v11.16b, \in3\().16b, v12.16b
+ tbl \in3\().16b, {v16.16b-v19.16b}, \in3\().16b
+ tbx \in0\().16b, {v20.16b-v23.16b}, v8.16b
+ tbx \in1\().16b, {v20.16b-v23.16b}, v9.16b
+ sub v8.16b, v8.16b, v12.16b
+ tbx \in2\().16b, {v20.16b-v23.16b}, v10.16b
+ sub v9.16b, v9.16b, v12.16b
+ tbx \in3\().16b, {v20.16b-v23.16b}, v11.16b
+ sub v10.16b, v10.16b, v12.16b
+ tbx \in0\().16b, {v24.16b-v27.16b}, v8.16b
+ sub v11.16b, v11.16b, v12.16b
+ tbx \in1\().16b, {v24.16b-v27.16b}, v9.16b
+ sub v8.16b, v8.16b, v12.16b
+ tbx \in2\().16b, {v24.16b-v27.16b}, v10.16b
+ sub v9.16b, v9.16b, v12.16b
+ tbx \in3\().16b, {v24.16b-v27.16b}, v11.16b
+ sub v10.16b, v10.16b, v12.16b
+ tbx \in0\().16b, {v28.16b-v31.16b}, v8.16b
+ sub v11.16b, v11.16b, v12.16b
+ tbx \in1\().16b, {v28.16b-v31.16b}, v9.16b
+ tbx \in2\().16b, {v28.16b-v31.16b}, v10.16b
+ tbx \in3\().16b, {v28.16b-v31.16b}, v11.16b
+ .endm
+
+ .macro mul_by_x_2x, out0, out1, in0, in1, tmp0, tmp1, const
+ sshr \tmp0\().16b, \in0\().16b, #7
+ add \out0\().16b, \in0\().16b, \in0\().16b
+ sshr \tmp1\().16b, \in1\().16b, #7
+ and \tmp0\().16b, \tmp0\().16b, \const\().16b
+ add \out1\().16b, \in1\().16b, \in1\().16b
+ and \tmp1\().16b, \tmp1\().16b, \const\().16b
+ eor \out0\().16b, \out0\().16b, \tmp0\().16b
+ eor \out1\().16b, \out1\().16b, \tmp1\().16b
+ .endm
+
+ .macro mix_columns_2x, in0, in1
+ mul_by_x_2x v8, v9, \in0, \in1, v10, v11, v14
+ rev32 v10.8h, \in0\().8h
+ rev32 v11.8h, \in1\().8h
+ eor \in0\().16b, v8.16b, \in0\().16b
+ eor \in1\().16b, v9.16b, \in1\().16b
+ shl v12.4s, v10.4s, #24
+ shl v13.4s, v11.4s, #24
+ eor v8.16b, v8.16b, v10.16b
+ sri v12.4s, v10.4s, #8
+ shl v10.4s, \in0\().4s, #24
+ eor v9.16b, v9.16b, v11.16b
+ sri v13.4s, v11.4s, #8
+ shl v11.4s, \in1\().4s, #24
+ sri v10.4s, \in0\().4s, #8
+ eor \in0\().16b, v8.16b, v12.16b
+ sri v11.4s, \in1\().4s, #8
+ eor \in1\().16b, v9.16b, v13.16b
+ eor \in0\().16b, v10.16b, \in0\().16b
+ eor \in1\().16b, v11.16b, \in1\().16b
+ .endm
+
+ .macro inv_mix_cols_2x, in0, in1
+ mul_by_x_2x v8, v9, \in0, \in1, v10, v11, v14
+ mul_by_x_2x v8, v9, v8, v9, v10, v11, v14
+ eor \in0\().16b, \in0\().16b, v8.16b
+ eor \in1\().16b, \in1\().16b, v9.16b
+ rev32 v8.8h, v8.8h
+ rev32 v9.8h, v9.8h
+ eor \in0\().16b, \in0\().16b, v8.16b
+ eor \in1\().16b, \in1\().16b, v9.16b
+ mix_columns_2x \in0, \in1
+ .endm
+
+ .macro inv_mix_cols_4x, in0, in1, in2, in3
+ mul_by_x_2x v8, v9, \in0, \in1, v10, v11, v14
+ mul_by_x_2x v10, v11, \in2, \in3, v12, v13, v14
+ mul_by_x_2x v8, v9, v8, v9, v12, v13, v14
+ mul_by_x_2x v10, v11, v10, v11, v12, v13, v14
+ eor \in0\().16b, \in0\().16b, v8.16b
+ eor \in1\().16b, \in1\().16b, v9.16b
+ eor \in2\().16b, \in2\().16b, v10.16b
+ eor \in3\().16b, \in3\().16b, v11.16b
+ rev32 v8.8h, v8.8h
+ rev32 v9.8h, v9.8h
+ rev32 v10.8h, v10.8h
+ rev32 v11.8h, v11.8h
+ eor \in0\().16b, \in0\().16b, v8.16b
+ eor \in1\().16b, \in1\().16b, v9.16b
+ eor \in2\().16b, \in2\().16b, v10.16b
+ eor \in3\().16b, \in3\().16b, v11.16b
+ mix_columns_2x \in0, \in1
+ mix_columns_2x \in2, \in3
+ .endm
+
+ .macro do_block_2x, enc, in0, in1 rounds, rk, rkp, i
+ ld1 {v15.16b}, [\rk]
+ add \rkp, \rk, #16
+ mov \i, \rounds
+1111: eor \in0\().16b, \in0\().16b, v15.16b /* ^round key */
+ eor \in1\().16b, \in1\().16b, v15.16b /* ^round key */
+ sub_bytes_2x \in0, \in1
+ tbl \in0\().16b, {\in0\().16b}, v13.16b /* ShiftRows */
+ tbl \in1\().16b, {\in1\().16b}, v13.16b /* ShiftRows */
+ ld1 {v15.16b}, [\rkp], #16
+ subs \i, \i, #1
+ beq 2222f
+ .if \enc == 1
+ mix_columns_2x \in0, \in1
+ ldr q13, .LForward_ShiftRows
+ .else
+ inv_mix_cols_2x \in0, \in1
+ ldr q13, .LReverse_ShiftRows
+ .endif
+ movi v12.16b, #0x40
+ b 1111b
+2222: eor \in0\().16b, \in0\().16b, v15.16b /* ^round key */
+ eor \in1\().16b, \in1\().16b, v15.16b /* ^round key */
+ .endm
+
+ .macro do_block_4x, enc, in0, in1, in2, in3, rounds, rk, rkp, i
+ ld1 {v15.16b}, [\rk]
+ add \rkp, \rk, #16
+ mov \i, \rounds
+1111: eor \in0\().16b, \in0\().16b, v15.16b /* ^round key */
+ eor \in1\().16b, \in1\().16b, v15.16b /* ^round key */
+ eor \in2\().16b, \in2\().16b, v15.16b /* ^round key */
+ eor \in3\().16b, \in3\().16b, v15.16b /* ^round key */
+ sub_bytes_4x \in0, \in1, \in2, \in3
+ tbl \in0\().16b, {\in0\().16b}, v13.16b /* ShiftRows */
+ tbl \in1\().16b, {\in1\().16b}, v13.16b /* ShiftRows */
+ tbl \in2\().16b, {\in2\().16b}, v13.16b /* ShiftRows */
+ tbl \in3\().16b, {\in3\().16b}, v13.16b /* ShiftRows */
+ ld1 {v15.16b}, [\rkp], #16
+ subs \i, \i, #1
+ beq 2222f
+ .if \enc == 1
+ mix_columns_2x \in0, \in1
+ mix_columns_2x \in2, \in3
+ ldr q13, .LForward_ShiftRows
+ .else
+ inv_mix_cols_4x \in0, \in1, \in2, \in3
+ ldr q13, .LReverse_ShiftRows
+ .endif
+ movi v12.16b, #0x40
+ b 1111b
+2222: eor \in0\().16b, \in0\().16b, v15.16b /* ^round key */
+ eor \in1\().16b, \in1\().16b, v15.16b /* ^round key */
+ eor \in2\().16b, \in2\().16b, v15.16b /* ^round key */
+ eor \in3\().16b, \in3\().16b, v15.16b /* ^round key */
+ .endm
+
+ .macro encrypt_block2x, in0, in1, rounds, rk, rkp, i
+ do_block_2x 1, \in0, \in1, \rounds, \rk, \rkp, \i
+ .endm
+
+ .macro decrypt_block2x, in0, in1, rounds, rk, rkp, i
+ do_block_2x 0, \in0, \in1, \rounds, \rk, \rkp, \i
+ .endm
+
+ .macro encrypt_block4x, in0, in1, in2, in3, rounds, rk, rkp, i
+ do_block_4x 1, \in0, \in1, \in2, \in3, \rounds, \rk, \rkp, \i
+ .endm
+
+ .macro decrypt_block4x, in0, in1, in2, in3, rounds, rk, rkp, i
+ do_block_4x 0, \in0, \in1, \in2, \in3, \rounds, \rk, \rkp, \i
+ .endm
+
+#include "aes-modes.S"
+
+ .text
+ .align 4
+.LForward_ShiftRows:
+ .byte 0x0, 0x5, 0xa, 0xf, 0x4, 0x9, 0xe, 0x3
+ .byte 0x8, 0xd, 0x2, 0x7, 0xc, 0x1, 0x6, 0xb
+
+.LReverse_ShiftRows:
+ .byte 0x0, 0xd, 0xa, 0x7, 0x4, 0x1, 0xe, 0xb
+ .byte 0x8, 0x5, 0x2, 0xf, 0xc, 0x9, 0x6, 0x3
+
+.LForward_Sbox:
+ .byte 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5
+ .byte 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76
+ .byte 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0
+ .byte 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0
+ .byte 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc
+ .byte 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15
+ .byte 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a
+ .byte 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75
+ .byte 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0
+ .byte 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84
+ .byte 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b
+ .byte 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf
+ .byte 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85
+ .byte 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8
+ .byte 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5
+ .byte 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2
+ .byte 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17
+ .byte 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73
+ .byte 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88
+ .byte 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb
+ .byte 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c
+ .byte 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79
+ .byte 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9
+ .byte 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08
+ .byte 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6
+ .byte 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a
+ .byte 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e
+ .byte 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e
+ .byte 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94
+ .byte 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf
+ .byte 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68
+ .byte 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
+
+.LReverse_Sbox:
+ .byte 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38
+ .byte 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb
+ .byte 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87
+ .byte 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb
+ .byte 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d
+ .byte 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e
+ .byte 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2
+ .byte 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25
+ .byte 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16
+ .byte 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92
+ .byte 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda
+ .byte 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84
+ .byte 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a
+ .byte 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06
+ .byte 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02
+ .byte 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b
+ .byte 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea
+ .byte 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73
+ .byte 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85
+ .byte 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e
+ .byte 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89
+ .byte 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b
+ .byte 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20
+ .byte 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4
+ .byte 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31
+ .byte 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f
+ .byte 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d
+ .byte 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef
+ .byte 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0
+ .byte 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61
+ .byte 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26
+ .byte 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d