From 0fcc1c76d1acaa68a0675f0baa0e5d9a25908bae Mon Sep 17 00:00:00 2001 From: Loic Poulain Date: Wed, 1 Jun 2022 20:26:31 +0200 Subject: armv8 SHA-256 using ARMv8 Crypto Extensions This patch adds support for the SHA-256 Secure Hash Algorithm for CPUs that have support for the SHA-256 part of the ARM v8 Crypto Extensions. It greatly improves sha-256 based operations, about 17x faster on iMX8M evk board. ~12ms vs ~208ms for a 20MiB kernel sha-256 verification. asm implementation is a simplified version of the Linux version (from Ard Biesheuvel). Signed-off-by: Loic Poulain --- arch/arm/cpu/armv8/Kconfig | 4 ++ arch/arm/cpu/armv8/Makefile | 1 + arch/arm/cpu/armv8/sha256_ce_core.S | 134 ++++++++++++++++++++++++++++++++++++ arch/arm/cpu/armv8/sha256_ce_glue.c | 21 ++++++ 4 files changed, 160 insertions(+) create mode 100644 arch/arm/cpu/armv8/sha256_ce_core.S create mode 100644 arch/arm/cpu/armv8/sha256_ce_glue.c diff --git a/arch/arm/cpu/armv8/Kconfig b/arch/arm/cpu/armv8/Kconfig index 1768e67..72d12b4 100644 --- a/arch/arm/cpu/armv8/Kconfig +++ b/arch/arm/cpu/armv8/Kconfig @@ -194,6 +194,10 @@ config ARMV8_CE_SHA1 bool "SHA-1 digest algorithm (ARMv8 Crypto Extensions)" default y if SHA1 +config ARMV8_CE_SHA256 + bool "SHA-256 digest algorithm (ARMv8 Crypto Extensions)" + default y if SHA256 + endif endif diff --git a/arch/arm/cpu/armv8/Makefile b/arch/arm/cpu/armv8/Makefile index ff2495c..2e4bf9e 100644 --- a/arch/arm/cpu/armv8/Makefile +++ b/arch/arm/cpu/armv8/Makefile @@ -45,3 +45,4 @@ obj-$(CONFIG_ARMV8_PSCI) += psci.o obj-$(CONFIG_TARGET_BCMNS3) += bcmns3/ obj-$(CONFIG_XEN) += xen/ obj-$(CONFIG_ARMV8_CE_SHA1) += sha1_ce_glue.o sha1_ce_core.o +obj-$(CONFIG_ARMV8_CE_SHA256) += sha256_ce_glue.o sha256_ce_core.o diff --git a/arch/arm/cpu/armv8/sha256_ce_core.S b/arch/arm/cpu/armv8/sha256_ce_core.S new file mode 100644 index 0000000..fbae3ca --- /dev/null +++ b/arch/arm/cpu/armv8/sha256_ce_core.S @@ -0,0 +1,134 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * sha256-ce-core.S - core SHA-256 transform using v8 Crypto Extensions + * + * Copyright (C) 2014 Linaro Ltd + * Copyright (C) 2022 Linaro Ltd + */ + + #include + #include + #include + #include + + .text + .arch armv8-a+crypto + + dga .req q20 + dgav .req v20 + dgb .req q21 + dgbv .req v21 + + t0 .req v22 + t1 .req v23 + + dg0q .req q24 + dg0v .req v24 + dg1q .req q25 + dg1v .req v25 + dg2q .req q26 + dg2v .req v26 + + .macro add_only, ev, rc, s0 + mov dg2v.16b, dg0v.16b + .ifeq \ev + add t1.4s, v\s0\().4s, \rc\().4s + sha256h dg0q, dg1q, t0.4s + sha256h2 dg1q, dg2q, t0.4s + .else + .ifnb \s0 + add t0.4s, v\s0\().4s, \rc\().4s + .endif + sha256h dg0q, dg1q, t1.4s + sha256h2 dg1q, dg2q, t1.4s + .endif + .endm + + .macro add_update, ev, rc, s0, s1, s2, s3 + sha256su0 v\s0\().4s, v\s1\().4s + add_only \ev, \rc, \s1 + sha256su1 v\s0\().4s, v\s2\().4s, v\s3\().4s + .endm + + /* + * The SHA-256 round constants + */ + .align 4 +.Lsha2_rcon: + .word 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5 + .word 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5 + .word 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3 + .word 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174 + .word 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc + .word 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da + .word 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7 + .word 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967 + .word 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13 + .word 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85 + .word 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3 + .word 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070 + .word 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5 + .word 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3 + .word 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208 + .word 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 + + /* + * void sha256_armv8_ce_process(struct sha256_ce_state *sst, + * uint8_t const *src, uint32_t blocks) + */ +ENTRY(sha256_armv8_ce_process) + /* load round constants */ + adr x8, .Lsha2_rcon + ld1 { v0.4s- v3.4s}, [x8], #64 + ld1 { v4.4s- v7.4s}, [x8], #64 + ld1 { v8.4s-v11.4s}, [x8], #64 + ld1 {v12.4s-v15.4s}, [x8] + + /* load state */ + ldp dga, dgb, [x0] + + /* load input */ +0: ld1 {v16.4s-v19.4s}, [x1], #64 + sub w2, w2, #1 +#if __BYTE_ORDER == __LITTLE_ENDIAN + rev32 v16.16b, v16.16b + rev32 v17.16b, v17.16b + rev32 v18.16b, v18.16b + rev32 v19.16b, v19.16b +#endif + +1: add t0.4s, v16.4s, v0.4s + mov dg0v.16b, dgav.16b + mov dg1v.16b, dgbv.16b + + add_update 0, v1, 16, 17, 18, 19 + add_update 1, v2, 17, 18, 19, 16 + add_update 0, v3, 18, 19, 16, 17 + add_update 1, v4, 19, 16, 17, 18 + + add_update 0, v5, 16, 17, 18, 19 + add_update 1, v6, 17, 18, 19, 16 + add_update 0, v7, 18, 19, 16, 17 + add_update 1, v8, 19, 16, 17, 18 + + add_update 0, v9, 16, 17, 18, 19 + add_update 1, v10, 17, 18, 19, 16 + add_update 0, v11, 18, 19, 16, 17 + add_update 1, v12, 19, 16, 17, 18 + + add_only 0, v13, 17 + add_only 1, v14, 18 + add_only 0, v15, 19 + add_only 1 + + /* update state */ + add dgav.4s, dgav.4s, dg0v.4s + add dgbv.4s, dgbv.4s, dg1v.4s + + /* handled all input blocks? */ + cbnz w2, 0b + + /* store new state */ +3: stp dga, dgb, [x0] + ret +ENDPROC(sha256_armv8_ce_process) diff --git a/arch/arm/cpu/armv8/sha256_ce_glue.c b/arch/arm/cpu/armv8/sha256_ce_glue.c new file mode 100644 index 0000000..67dd796 --- /dev/null +++ b/arch/arm/cpu/armv8/sha256_ce_glue.c @@ -0,0 +1,21 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * sha256_ce_glue.c - SHA-256 secure hash using ARMv8 Crypto Extensions + * + * Copyright (C) 2022 Linaro Ltd + */ + +#include +#include + +extern void sha256_armv8_ce_process(uint32_t state[8], uint8_t const *src, + uint32_t blocks); + +void sha256_process(sha256_context *ctx, const unsigned char *data, + unsigned int blocks) +{ + if (!blocks) + return; + + sha256_armv8_ce_process(ctx->state, data, blocks); +} -- cgit v1.1