This is a reimplementation of the NEON version of the bit-sliced AES algorithm. This code is heavily based on Andy Polyakov's OpenSSL version for ARM, which is also available in the kernel. This is an alternative for the existing NEON implementation for arm64 authored by me, which suffers from poor performance due to its reliance on the pathologically slow four register variant of the tbl/tbx NEON instruction. This version is about ~30% (*) faster than the generic C code, but only in cases where the input can be 8x interleaved (this is a fundamental property of bit slicing). For this reason, only the chaining modes ECB, XTS and CTR are implemented. (The significance of ECB is that it could potentially be used by other chaining modes) * Measured on Cortex-A57. Note that this is still an order of magnitude slower than the implementations that use the dedicated AES instructions introduced in ARMv8, but those are part of an optional extension, and so it is good to have a fallback. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> --- arch/arm64/crypto/Kconfig | 7 + arch/arm64/crypto/Makefile | 3 + arch/arm64/crypto/aes-neonbs-core.S | 963 ++++++++++++++++++++ arch/arm64/crypto/aes-neonbs-glue.c | 420 +++++++++ 4 files changed, 1393 insertions(+) diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig index 0826f8e599a6..5de75c3dcbd4 100644 --- a/arch/arm64/crypto/Kconfig +++ b/arch/arm64/crypto/Kconfig @@ -82,4 +82,11 @@ config CRYPTO_CHACHA20_NEON select CRYPTO_BLKCIPHER select CRYPTO_CHACHA20 +config CRYPTO_AES_ARM64_BS + tristate "AES in ECB/CBC/CTR/XTS modes using bit-sliced NEON algorithm" + depends on KERNEL_MODE_NEON + select CRYPTO_BLKCIPHER + select CRYPTO_AES_ARM64 + select CRYPTO_SIMD + endif diff --git a/arch/arm64/crypto/Makefile b/arch/arm64/crypto/Makefile index a893507629eb..d1ae1b9cbe70 100644 --- a/arch/arm64/crypto/Makefile +++ b/arch/arm64/crypto/Makefile @@ -47,6 +47,9 @@ chacha20-neon-y := chacha20-neon-core.o chacha20-neon-glue.o obj-$(CONFIG_CRYPTO_AES_ARM64) += aes-arm64.o aes-arm64-y := aes-cipher-core.o aes-cipher-glue.o +obj-$(CONFIG_CRYPTO_AES_ARM64_BS) += aes-neon-bs.o +aes-neon-bs-y := aes-neonbs-core.o aes-neonbs-glue.o + AFLAGS_aes-ce.o := -DINTERLEAVE=4 AFLAGS_aes-neon.o := -DINTERLEAVE=4 diff --git a/arch/arm64/crypto/aes-neonbs-core.S b/arch/arm64/crypto/aes-neonbs-core.S new file mode 100644 index 000000000000..8d0cdaa2768d --- /dev/null +++ b/arch/arm64/crypto/aes-neonbs-core.S @@ -0,0 +1,963 @@ +/* + * Bit sliced AES using NEON instructions + * + * Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@xxxxxxxxxx> + * + * 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. + */ + +/* + * 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@xxxxxxxxxxx> + */ + +#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) + */ +ENTRY(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 +ENDPROC(aesbs_convert_key) + + .align 4 +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 +ENDPROC(aesbs_encrypt8) + + .align 4 +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 +ENDPROC(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 + stp x29, x30, [sp, #-16]! + mov x29, sp + +99: mov x5, #1 + lsl x5, x5, x4 + subs w4, w4, #8 + csel x4, x4, xzr, pl + csel x5, x5, xzr, mi + + ld1 {v0.16b}, [x1], #16 + tbnz x5, #1, 0f + ld1 {v1.16b}, [x1], #16 + tbnz x5, #2, 0f + ld1 {v2.16b}, [x1], #16 + tbnz x5, #3, 0f + ld1 {v3.16b}, [x1], #16 + tbnz x5, #4, 0f + ld1 {v4.16b}, [x1], #16 + tbnz x5, #5, 0f + ld1 {v5.16b}, [x1], #16 + tbnz x5, #6, 0f + ld1 {v6.16b}, [x1], #16 + tbnz x5, #7, 0f + ld1 {v7.16b}, [x1], #16 + +0: mov bskey, x2 + mov rounds, x3 + bl \do8 + + st1 {\o0\().16b}, [x0], #16 + tbnz x5, #1, 1f + st1 {\o1\().16b}, [x0], #16 + tbnz x5, #2, 1f + st1 {\o2\().16b}, [x0], #16 + tbnz x5, #3, 1f + st1 {\o3\().16b}, [x0], #16 + tbnz x5, #4, 1f + st1 {\o4\().16b}, [x0], #16 + tbnz x5, #5, 1f + st1 {\o5\().16b}, [x0], #16 + tbnz x5, #6, 1f + st1 {\o6\().16b}, [x0], #16 + tbnz x5, #7, 1f + st1 {\o7\().16b}, [x0], #16 + + cbnz x4, 99b + +1: ldp x29, x30, [sp], #16 + ret + .endm + + .align 4 +ENTRY(aesbs_ecb_encrypt) + __ecb_crypt aesbs_encrypt8, v0, v1, v4, v6, v3, v7, v2, v5 +ENDPROC(aesbs_ecb_encrypt) + + .align 4 +ENTRY(aesbs_ecb_decrypt) + __ecb_crypt aesbs_decrypt8, v0, v1, v6, v4, v2, v7, v3, v5 +ENDPROC(aesbs_ecb_decrypt) + + /* + * aesbs_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, + * int blocks, u8 iv[]) + */ + .align 4 +ENTRY(aesbs_cbc_decrypt) + stp x29, x30, [sp, #-16]! + mov x29, sp + +99: mov x6, #1 + lsl x6, x6, x4 + subs w4, w4, #8 + csel x4, x4, xzr, pl + csel x6, x6, xzr, mi + + ld1 {v0.16b}, [x1], #16 + mov v25.16b, v0.16b + tbnz x6, #1, 0f + ld1 {v1.16b}, [x1], #16 + mov v26.16b, v1.16b + tbnz x6, #2, 0f + ld1 {v2.16b}, [x1], #16 + mov v27.16b, v2.16b + tbnz x6, #3, 0f + ld1 {v3.16b}, [x1], #16 + mov v28.16b, v3.16b + tbnz x6, #4, 0f + ld1 {v4.16b}, [x1], #16 + mov v29.16b, v4.16b + tbnz x6, #5, 0f + ld1 {v5.16b}, [x1], #16 + mov v30.16b, v5.16b + tbnz x6, #6, 0f + ld1 {v6.16b}, [x1], #16 + mov v31.16b, v6.16b + tbnz x6, #7, 0f + ld1 {v7.16b}, [x1] + +0: mov bskey, x2 + mov rounds, x3 + bl aesbs_decrypt8 + + ld1 {v24.16b}, [x5] // 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}, [x0], #16 + mov v24.16b, v25.16b + tbnz x6, #1, 1f + st1 {v1.16b}, [x0], #16 + mov v24.16b, v26.16b + tbnz x6, #2, 1f + st1 {v6.16b}, [x0], #16 + mov v24.16b, v27.16b + tbnz x6, #3, 1f + st1 {v4.16b}, [x0], #16 + mov v24.16b, v28.16b + tbnz x6, #4, 1f + st1 {v2.16b}, [x0], #16 + mov v24.16b, v29.16b + tbnz x6, #5, 1f + st1 {v7.16b}, [x0], #16 + mov v24.16b, v30.16b + tbnz x6, #6, 1f + st1 {v3.16b}, [x0], #16 + mov v24.16b, v31.16b + tbnz x6, #7, 1f + ld1 {v24.16b}, [x1], #16 + st1 {v5.16b}, [x0], #16 +1: st1 {v24.16b}, [x5] // store IV + + cbnz x4, 99b + + ldp x29, x30, [sp], #16 + ret +ENDPROC(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 + + .align 4 +.Lxts_mul_x: +CPU_LE( .quad 1, 0x87 ) +CPU_BE( .quad 0x87, 1 ) + + /* + * 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[]) + */ +__xts_crypt8: + mov x6, #1 + lsl x6, x6, x4 + subs w4, w4, #8 + csel x4, x4, xzr, pl + csel x6, x6, xzr, mi + + ld1 {v0.16b}, [x1], #16 + next_tweak v26, v25, v30, v31 + eor v0.16b, v0.16b, v25.16b + tbnz x6, #1, 0f + + ld1 {v1.16b}, [x1], #16 + next_tweak v27, v26, v30, v31 + eor v1.16b, v1.16b, v26.16b + tbnz x6, #2, 0f + + ld1 {v2.16b}, [x1], #16 + next_tweak v28, v27, v30, v31 + eor v2.16b, v2.16b, v27.16b + tbnz x6, #3, 0f + + ld1 {v3.16b}, [x1], #16 + next_tweak v29, v28, v30, v31 + eor v3.16b, v3.16b, v28.16b + tbnz x6, #4, 0f + + ld1 {v4.16b}, [x1], #16 + str q29, [sp, #16] + eor v4.16b, v4.16b, v29.16b + next_tweak v29, v29, v30, v31 + tbnz x6, #5, 0f + + ld1 {v5.16b}, [x1], #16 + str q29, [sp, #32] + eor v5.16b, v5.16b, v29.16b + next_tweak v29, v29, v30, v31 + tbnz x6, #6, 0f + + ld1 {v6.16b}, [x1], #16 + str q29, [sp, #48] + eor v6.16b, v6.16b, v29.16b + next_tweak v29, v29, v30, v31 + tbnz x6, #7, 0f + + ld1 {v7.16b}, [x1], #16 + str q29, [sp, #64] + eor v7.16b, v7.16b, v29.16b + next_tweak v29, v29, v30, v31 + +0: mov bskey, x2 + mov rounds, x3 + br x7 +ENDPROC(__xts_crypt8) + + .macro __xts_crypt, do8, o0, o1, o2, o3, o4, o5, o6, o7 + stp x29, x30, [sp, #-80]! + mov x29, sp + + ldr q30, .Lxts_mul_x + ld1 {v25.16b}, [x5] + +99: adr x7, \do8 + bl __xts_crypt8 + + ldp q16, q17, [sp, #16] + ldp q18, q19, [sp, #48] + + eor \o0\().16b, \o0\().16b, v25.16b + eor \o1\().16b, \o1\().16b, v26.16b + eor \o2\().16b, \o2\().16b, v27.16b + eor \o3\().16b, \o3\().16b, v28.16b + + st1 {\o0\().16b}, [x0], #16 + mov v25.16b, v26.16b + tbnz x6, #1, 1f + st1 {\o1\().16b}, [x0], #16 + mov v25.16b, v27.16b + tbnz x6, #2, 1f + st1 {\o2\().16b}, [x0], #16 + mov v25.16b, v28.16b + tbnz x6, #3, 1f + st1 {\o3\().16b}, [x0], #16 + mov v25.16b, v29.16b + tbnz x6, #4, 1f + + eor \o4\().16b, \o4\().16b, v16.16b + eor \o5\().16b, \o5\().16b, v17.16b + eor \o6\().16b, \o6\().16b, v18.16b + eor \o7\().16b, \o7\().16b, v19.16b + + st1 {\o4\().16b}, [x0], #16 + tbnz x6, #5, 1f + st1 {\o5\().16b}, [x0], #16 + tbnz x6, #6, 1f + st1 {\o6\().16b}, [x0], #16 + tbnz x6, #7, 1f + st1 {\o7\().16b}, [x0], #16 + + cbnz x4, 99b + +1: st1 {v25.16b}, [x5] + ldp x29, x30, [sp], #80 + ret + .endm + +ENTRY(aesbs_xts_encrypt) + __xts_crypt aesbs_encrypt8, v0, v1, v4, v6, v3, v7, v2, v5 +ENDPROC(aesbs_xts_encrypt) + +ENTRY(aesbs_xts_decrypt) + __xts_crypt aesbs_decrypt8, v0, v1, v6, v4, v2, v7, v3, v5 +ENDPROC(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[], bool final) + */ +ENTRY(aesbs_ctr_encrypt) + stp x29, x30, [sp, #-16]! + mov x29, sp + + add x4, x4, x6 // do one extra block if final + + 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 + +99: mov x9, #1 + lsl x9, x9, x4 + subs w4, w4, #8 + csel x4, x4, xzr, pl + csel x9, x9, xzr, le + + next_ctr v1 + next_ctr v2 + next_ctr v3 + next_ctr v4 + next_ctr v5 + next_ctr v6 + next_ctr v7 + +0: mov bskey, x2 + mov rounds, x3 + bl aesbs_encrypt8 + + lsr x9, x9, x6 // disregard the extra block + tbnz x9, #0, 0f + + ld1 {v8.16b}, [x1], #16 + eor v0.16b, v0.16b, v8.16b + st1 {v0.16b}, [x0], #16 + tbnz x9, #1, 1f + + ld1 {v9.16b}, [x1], #16 + eor v1.16b, v1.16b, v9.16b + st1 {v1.16b}, [x0], #16 + tbnz x9, #2, 2f + + ld1 {v10.16b}, [x1], #16 + eor v4.16b, v4.16b, v10.16b + st1 {v4.16b}, [x0], #16 + tbnz x9, #3, 3f + + ld1 {v11.16b}, [x1], #16 + eor v6.16b, v6.16b, v11.16b + st1 {v6.16b}, [x0], #16 + tbnz x9, #4, 4f + + ld1 {v12.16b}, [x1], #16 + eor v3.16b, v3.16b, v12.16b + st1 {v3.16b}, [x0], #16 + tbnz x9, #5, 5f + + ld1 {v13.16b}, [x1], #16 + eor v7.16b, v7.16b, v13.16b + st1 {v7.16b}, [x0], #16 + tbnz x9, #6, 6f + + ld1 {v14.16b}, [x1], #16 + eor v2.16b, v2.16b, v14.16b + st1 {v2.16b}, [x0], #16 + tbnz x9, #7, 7f + + ld1 {v15.16b}, [x1], #16 + eor v5.16b, v5.16b, v15.16b + st1 {v5.16b}, [x0], #16 + + next_ctr v0 + cbnz x4, 99b + +0: st1 {v0.16b}, [x5] +8: ldp x29, x30, [sp], #16 + ret + + /* + * If we are handling the tail of the input (x6 == 1), return the + * final keystream block back to the caller via the IV buffer. + */ +1: cbz x6, 8b + st1 {v1.16b}, [x5] + b 8b +2: cbz x6, 8b + st1 {v4.16b}, [x5] + b 8b +3: cbz x6, 8b + st1 {v6.16b}, [x5] + b 8b +4: cbz x6, 8b + st1 {v3.16b}, [x5] + b 8b +5: cbz x6, 8b + st1 {v7.16b}, [x5] + b 8b +6: cbz x6, 8b + st1 {v2.16b}, [x5] + b 8b +7: cbz x6, 8b + st1 {v5.16b}, [x5] + b 8b +ENDPROC(aesbs_ctr_encrypt) diff --git a/arch/arm64/crypto/aes-neonbs-glue.c b/arch/arm64/crypto/aes-neonbs-glue.c new file mode 100644 index 000000000000..323dd76ae5f0 --- /dev/null +++ b/arch/arm64/crypto/aes-neonbs-glue.c @@ -0,0 +1,420 @@ +/* + * Bit sliced AES using NEON instructions + * + * Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@xxxxxxxxxx> + * + * 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 <asm/neon.h> +#include <crypto/aes.h> +#include <crypto/cbc.h> +#include <crypto/internal/simd.h> +#include <crypto/internal/skcipher.h> +#include <crypto/xts.h> +#include <linux/module.h> + +MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>"); +MODULE_LICENSE("GPL v2"); + +MODULE_ALIAS_CRYPTO("ecb(aes)"); +MODULE_ALIAS_CRYPTO("cbc(aes)"); +MODULE_ALIAS_CRYPTO("ctr(aes)"); +MODULE_ALIAS_CRYPTO("xts(aes)"); + +asmlinkage void aesbs_convert_key(u8 out[], u32 const rk[], int rounds); + +asmlinkage void aesbs_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], + int rounds, int blocks); +asmlinkage void aesbs_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], + int rounds, int blocks); + +asmlinkage void aesbs_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], + int rounds, int blocks, u8 iv[]); + +asmlinkage void aesbs_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], + int rounds, int blocks, u8 iv[], bool final); + +asmlinkage void aesbs_xts_encrypt(u8 out[], u8 const in[], u8 const rk[], + int rounds, int blocks, u8 iv[]); +asmlinkage void aesbs_xts_decrypt(u8 out[], u8 const in[], u8 const rk[], + int rounds, int blocks, u8 iv[]); + +asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds); + +struct aesbs_ctx { + u8 rk[13 * (8 * AES_BLOCK_SIZE) + 32]; + int rounds; +} __aligned(AES_BLOCK_SIZE); + +struct aesbs_cbc_ctx { + struct aesbs_ctx key; + u32 enc[AES_MAX_KEYLENGTH_U32]; +}; + +struct aesbs_xts_ctx { + struct aesbs_ctx key; + u32 twkey[AES_MAX_KEYLENGTH_U32]; +}; + +static int aesbs_setkey(struct crypto_skcipher *tfm, const u8 *in_key, + unsigned int key_len) +{ + struct aesbs_ctx *ctx = crypto_skcipher_ctx(tfm); + struct crypto_aes_ctx rk; + int err; + + err = crypto_aes_expand_key(&rk, in_key, key_len); + if (err) + return err; + + ctx->rounds = 6 + key_len / 4; + + kernel_neon_begin(); + aesbs_convert_key(ctx->rk, rk.key_enc, ctx->rounds); + kernel_neon_end(); + + return 0; +} + +static int __ecb_crypt(struct skcipher_request *req, + void (*fn)(u8 out[], u8 const in[], u8 const rk[], + int rounds, int blocks)) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct aesbs_ctx *ctx = crypto_skcipher_ctx(tfm); + struct skcipher_walk walk; + int err; + + err = skcipher_walk_virt(&walk, req, true); + + kernel_neon_begin(); + while (walk.nbytes >= AES_BLOCK_SIZE) { + unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE; + + if (walk.nbytes < walk.total) + blocks = round_down(blocks, + walk.stride / AES_BLOCK_SIZE); + + fn(walk.dst.virt.addr, walk.src.virt.addr, ctx->rk, + ctx->rounds, blocks); + err = skcipher_walk_done(&walk, + walk.nbytes - blocks * AES_BLOCK_SIZE); + } + kernel_neon_end(); + + return err; +} + +static int ecb_encrypt(struct skcipher_request *req) +{ + return __ecb_crypt(req, aesbs_ecb_encrypt); +} + +static int ecb_decrypt(struct skcipher_request *req) +{ + return __ecb_crypt(req, aesbs_ecb_decrypt); +} + +static int aesbs_cbc_setkey(struct crypto_skcipher *tfm, const u8 *in_key, + unsigned int key_len) +{ + struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); + struct crypto_aes_ctx rk; + int err; + + err = crypto_aes_expand_key(&rk, in_key, key_len); + if (err) + return err; + + ctx->key.rounds = 6 + key_len / 4; + + memcpy(ctx->enc, rk.key_enc, sizeof(ctx->enc)); + + kernel_neon_begin(); + aesbs_convert_key(ctx->key.rk, rk.key_enc, ctx->key.rounds); + kernel_neon_end(); + + return 0; +} + +static void cbc_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst) +{ + struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); + + __aes_arm64_encrypt(ctx->enc, dst, src, ctx->key.rounds); +} + +static int cbc_encrypt(struct skcipher_request *req) +{ + return crypto_cbc_encrypt_walk(req, cbc_encrypt_one); +} + +static int cbc_decrypt(struct skcipher_request *req) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); + struct skcipher_walk walk; + int err; + + err = skcipher_walk_virt(&walk, req, true); + + kernel_neon_begin(); + while (walk.nbytes >= AES_BLOCK_SIZE) { + unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE; + + if (walk.nbytes < walk.total) + blocks = round_down(blocks, + walk.stride / AES_BLOCK_SIZE); + + aesbs_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr, + ctx->key.rk, ctx->key.rounds, blocks, + walk.iv); + err = skcipher_walk_done(&walk, + walk.nbytes - blocks * AES_BLOCK_SIZE); + } + kernel_neon_end(); + + return err; +} + +static int ctr_encrypt(struct skcipher_request *req) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct aesbs_ctx *ctx = crypto_skcipher_ctx(tfm); + struct skcipher_walk walk; + int err; + + err = skcipher_walk_virt(&walk, req, true); + + kernel_neon_begin(); + while (walk.nbytes > 0) { + unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE; + bool final = (walk.total % AES_BLOCK_SIZE) != 0; + + if (walk.nbytes < walk.total) { + blocks = round_down(blocks, + walk.stride / AES_BLOCK_SIZE); + final = false; + } + + aesbs_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr, + ctx->rk, ctx->rounds, blocks, walk.iv, final); + + if (final) { + u8 *dst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE; + u8 *src = walk.src.virt.addr + blocks * AES_BLOCK_SIZE; + + if (dst != src) + memcpy(dst, src, walk.total % AES_BLOCK_SIZE); + crypto_xor(dst, walk.iv, walk.total % AES_BLOCK_SIZE); + + err = skcipher_walk_done(&walk, 0); + break; + } + err = skcipher_walk_done(&walk, + walk.nbytes - blocks * AES_BLOCK_SIZE); + } + kernel_neon_end(); + + return err; +} + +static int aesbs_xts_setkey(struct crypto_skcipher *tfm, const u8 *in_key, + unsigned int key_len) +{ + struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm); + struct crypto_aes_ctx rk; + int err; + + err = xts_verify_key(tfm, in_key, key_len); + if (err) + return err; + + key_len /= 2; + err = crypto_aes_expand_key(&rk, in_key + key_len, key_len); + if (err) + return err; + + memcpy(ctx->twkey, rk.key_enc, sizeof(ctx->twkey)); + + return aesbs_setkey(tfm, in_key, key_len); +} + +static int __xts_crypt(struct skcipher_request *req, + void (*fn)(u8 out[], u8 const in[], u8 const rk[], + int rounds, int blocks, u8 iv[])) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm); + struct skcipher_walk walk; + int err; + + err = skcipher_walk_virt(&walk, req, true); + + __aes_arm64_encrypt(ctx->twkey, walk.iv, walk.iv, ctx->key.rounds); + + kernel_neon_begin(); + while (walk.nbytes >= AES_BLOCK_SIZE) { + unsigned int blocks = walk.nbytes / AES_BLOCK_SIZE; + + if (walk.nbytes < walk.total) + blocks = round_down(blocks, + walk.stride / AES_BLOCK_SIZE); + + fn(walk.dst.virt.addr, walk.src.virt.addr, ctx->key.rk, + ctx->key.rounds, blocks, walk.iv); + err = skcipher_walk_done(&walk, + walk.nbytes - blocks * AES_BLOCK_SIZE); + } + kernel_neon_end(); + + return err; +} + +static int xts_encrypt(struct skcipher_request *req) +{ + return __xts_crypt(req, aesbs_xts_encrypt); +} + +static int xts_decrypt(struct skcipher_request *req) +{ + return __xts_crypt(req, aesbs_xts_decrypt); +} + +static struct skcipher_alg aes_algs[] = { { + .base.cra_name = "__ecb(aes)", + .base.cra_driver_name = "__ecb-aes-neonbs", + .base.cra_priority = 250, + .base.cra_blocksize = AES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct aesbs_ctx), + .base.cra_module = THIS_MODULE, + .base.cra_flags = CRYPTO_ALG_INTERNAL, + + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .walksize = 8 * AES_BLOCK_SIZE, + .setkey = aesbs_setkey, + .encrypt = ecb_encrypt, + .decrypt = ecb_decrypt, +}, { + .base.cra_name = "__cbc(aes)", + .base.cra_driver_name = "__cbc-aes-neonbs", + .base.cra_priority = 250, + .base.cra_blocksize = AES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct aesbs_cbc_ctx), + .base.cra_module = THIS_MODULE, + .base.cra_flags = CRYPTO_ALG_INTERNAL, + + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .walksize = 8 * AES_BLOCK_SIZE, + .ivsize = AES_BLOCK_SIZE, + .setkey = aesbs_cbc_setkey, + .encrypt = cbc_encrypt, + .decrypt = cbc_decrypt, +}, { + .base.cra_name = "__ctr(aes)", + .base.cra_driver_name = "__ctr-aes-neonbs", + .base.cra_priority = 250, + .base.cra_blocksize = 1, + .base.cra_ctxsize = sizeof(struct aesbs_ctx), + .base.cra_module = THIS_MODULE, + .base.cra_flags = CRYPTO_ALG_INTERNAL, + + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .chunksize = AES_BLOCK_SIZE, + .walksize = 8 * AES_BLOCK_SIZE, + .ivsize = AES_BLOCK_SIZE, + .setkey = aesbs_setkey, + .encrypt = ctr_encrypt, + .decrypt = ctr_encrypt, +}, { + .base.cra_name = "ctr(aes)", + .base.cra_driver_name = "ctr-aes-neonbs", + .base.cra_priority = 250 - 1, + .base.cra_blocksize = 1, + .base.cra_ctxsize = sizeof(struct aesbs_ctx), + .base.cra_module = THIS_MODULE, + + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .chunksize = AES_BLOCK_SIZE, + .walksize = 8 * AES_BLOCK_SIZE, + .ivsize = AES_BLOCK_SIZE, + .setkey = aesbs_setkey, + .encrypt = ctr_encrypt, + .decrypt = ctr_encrypt, +}, { + .base.cra_name = "__xts(aes)", + .base.cra_driver_name = "__xts-aes-neonbs", + .base.cra_priority = 250, + .base.cra_blocksize = AES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct aesbs_xts_ctx), + .base.cra_module = THIS_MODULE, + .base.cra_flags = CRYPTO_ALG_INTERNAL, + + .min_keysize = 2 * AES_MIN_KEY_SIZE, + .max_keysize = 2 * AES_MAX_KEY_SIZE, + .walksize = 8 * AES_BLOCK_SIZE, + .ivsize = AES_BLOCK_SIZE, + .setkey = aesbs_xts_setkey, + .encrypt = xts_encrypt, + .decrypt = xts_decrypt, +} }; + +static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)]; + +static void aes_exit(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(aes_simd_algs); i++) + if (aes_simd_algs[i]) + simd_skcipher_free(aes_simd_algs[i]); + + crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); +} + +static int __init aes_init(void) +{ + struct simd_skcipher_alg *simd; + const char *basename; + const char *algname; + const char *drvname; + int err; + int i; + + if (!(elf_hwcap & HWCAP_ASIMD)) + return -ENODEV; + + err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); + if (err) + return err; + + for (i = 0; i < ARRAY_SIZE(aes_algs); i++) { + if (!(aes_algs[i].base.cra_flags & CRYPTO_ALG_INTERNAL)) + continue; + + algname = aes_algs[i].base.cra_name + 2; + drvname = aes_algs[i].base.cra_driver_name + 2; + basename = aes_algs[i].base.cra_driver_name; + simd = simd_skcipher_create_compat(algname, drvname, basename); + err = PTR_ERR(simd); + if (IS_ERR(simd)) + goto unregister_simds; + + aes_simd_algs[i] = simd; + } + return 0; + +unregister_simds: + aes_exit(); + return err; +} + +module_init(aes_init); +module_exit(aes_exit); -- 2.7.4 -- To unsubscribe from this 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