arm64/crypto: SHA-1 using ARMv8 Crypto Extensions
This patch adds support for the SHA-1 Secure Hash Algorithm for CPUs that have support for the SHA-1 part of the ARM v8 Crypto Extensions. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Herbert Xu <herbert@gondor.apana.org.au>hifive-unleashed-5.1
Ard Biesheuvel
parent
190f1ca85d
commit
2c98833a42
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@ -342,5 +342,8 @@ source "arch/arm64/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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if CRYPTO
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source "arch/arm64/crypto/Kconfig"
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endif
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source "lib/Kconfig"
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@ -45,6 +45,7 @@ export TEXT_OFFSET GZFLAGS
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core-y += arch/arm64/kernel/ arch/arm64/mm/
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core-$(CONFIG_KVM) += arch/arm64/kvm/
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core-$(CONFIG_XEN) += arch/arm64/xen/
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core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
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libs-y := arch/arm64/lib/ $(libs-y)
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libs-y += $(LIBGCC)
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@ -0,0 +1,16 @@
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menuconfig ARM64_CRYPTO
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bool "ARM64 Accelerated Cryptographic Algorithms"
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depends on ARM64
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help
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Say Y here to choose from a selection of cryptographic algorithms
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implemented using ARM64 specific CPU features or instructions.
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if ARM64_CRYPTO
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config CRYPTO_SHA1_ARM64_CE
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tristate "SHA-1 digest algorithm (ARMv8 Crypto Extensions)"
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depends on ARM64 && KERNEL_MODE_NEON
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select CRYPTO_HASH
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endif
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@ -0,0 +1,12 @@
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#
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# linux/arch/arm64/crypto/Makefile
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#
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# Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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obj-$(CONFIG_CRYPTO_SHA1_ARM64_CE) += sha1-ce.o
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sha1-ce-y := sha1-ce-glue.o sha1-ce-core.o
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@ -0,0 +1,153 @@
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/*
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* sha1-ce-core.S - SHA-1 secure hash using ARMv8 Crypto Extensions
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*
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* Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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.text
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.arch armv8-a+crypto
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k0 .req v0
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k1 .req v1
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k2 .req v2
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k3 .req v3
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t0 .req v4
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t1 .req v5
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dga .req q6
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dgav .req v6
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dgb .req s7
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dgbv .req v7
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dg0q .req q12
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dg0s .req s12
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dg0v .req v12
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dg1s .req s13
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dg1v .req v13
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dg2s .req s14
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.macro add_only, op, ev, rc, s0, dg1
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.ifc \ev, ev
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add t1.4s, v\s0\().4s, \rc\().4s
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sha1h dg2s, dg0s
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.ifnb \dg1
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sha1\op dg0q, \dg1, t0.4s
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.else
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sha1\op dg0q, dg1s, t0.4s
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.endif
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.else
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.ifnb \s0
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add t0.4s, v\s0\().4s, \rc\().4s
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.endif
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sha1h dg1s, dg0s
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sha1\op dg0q, dg2s, t1.4s
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.endif
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.endm
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.macro add_update, op, ev, rc, s0, s1, s2, s3, dg1
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sha1su0 v\s0\().4s, v\s1\().4s, v\s2\().4s
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add_only \op, \ev, \rc, \s1, \dg1
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sha1su1 v\s0\().4s, v\s3\().4s
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.endm
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/*
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* The SHA1 round constants
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*/
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.align 4
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.Lsha1_rcon:
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.word 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6
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/*
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* void sha1_ce_transform(int blocks, u8 const *src, u32 *state,
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* u8 *head, long bytes)
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*/
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ENTRY(sha1_ce_transform)
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/* load round constants */
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adr x6, .Lsha1_rcon
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ld1r {k0.4s}, [x6], #4
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ld1r {k1.4s}, [x6], #4
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ld1r {k2.4s}, [x6], #4
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ld1r {k3.4s}, [x6]
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/* load state */
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ldr dga, [x2]
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ldr dgb, [x2, #16]
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/* load partial state (if supplied) */
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cbz x3, 0f
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ld1 {v8.4s-v11.4s}, [x3]
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b 1f
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/* load input */
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0: ld1 {v8.4s-v11.4s}, [x1], #64
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sub w0, w0, #1
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1:
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CPU_LE( rev32 v8.16b, v8.16b )
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CPU_LE( rev32 v9.16b, v9.16b )
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CPU_LE( rev32 v10.16b, v10.16b )
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CPU_LE( rev32 v11.16b, v11.16b )
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2: add t0.4s, v8.4s, k0.4s
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mov dg0v.16b, dgav.16b
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add_update c, ev, k0, 8, 9, 10, 11, dgb
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add_update c, od, k0, 9, 10, 11, 8
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add_update c, ev, k0, 10, 11, 8, 9
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add_update c, od, k0, 11, 8, 9, 10
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add_update c, ev, k1, 8, 9, 10, 11
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add_update p, od, k1, 9, 10, 11, 8
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add_update p, ev, k1, 10, 11, 8, 9
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add_update p, od, k1, 11, 8, 9, 10
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add_update p, ev, k1, 8, 9, 10, 11
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add_update p, od, k2, 9, 10, 11, 8
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add_update m, ev, k2, 10, 11, 8, 9
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add_update m, od, k2, 11, 8, 9, 10
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add_update m, ev, k2, 8, 9, 10, 11
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add_update m, od, k2, 9, 10, 11, 8
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add_update m, ev, k3, 10, 11, 8, 9
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add_update p, od, k3, 11, 8, 9, 10
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add_only p, ev, k3, 9
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add_only p, od, k3, 10
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add_only p, ev, k3, 11
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add_only p, od
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/* update state */
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add dgbv.2s, dgbv.2s, dg1v.2s
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add dgav.4s, dgav.4s, dg0v.4s
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cbnz w0, 0b
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/*
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* Final block: add padding and total bit count.
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* Skip if we have no total byte count in x4. In that case, the input
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* size was not a round multiple of the block size, and the padding is
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* handled by the C code.
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*/
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cbz x4, 3f
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movi v9.2d, #0
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mov x8, #0x80000000
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movi v10.2d, #0
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ror x7, x4, #29 // ror(lsl(x4, 3), 32)
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fmov d8, x8
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mov x4, #0
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mov v11.d[0], xzr
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mov v11.d[1], x7
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b 2b
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/* store new state */
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3: str dga, [x2]
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str dgb, [x2, #16]
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ret
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ENDPROC(sha1_ce_transform)
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@ -0,0 +1,174 @@
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/*
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* sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
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*
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* Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/neon.h>
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#include <asm/unaligned.h>
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#include <crypto/internal/hash.h>
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#include <crypto/sha.h>
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#include <linux/cpufeature.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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asmlinkage void sha1_ce_transform(int blocks, u8 const *src, u32 *state,
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u8 *head, long bytes);
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static int sha1_init(struct shash_desc *desc)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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*sctx = (struct sha1_state){
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.state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
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};
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return 0;
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}
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static int sha1_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
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sctx->count += len;
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if ((partial + len) >= SHA1_BLOCK_SIZE) {
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int blocks;
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if (partial) {
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int p = SHA1_BLOCK_SIZE - partial;
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memcpy(sctx->buffer + partial, data, p);
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data += p;
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len -= p;
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}
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blocks = len / SHA1_BLOCK_SIZE;
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len %= SHA1_BLOCK_SIZE;
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kernel_neon_begin_partial(16);
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sha1_ce_transform(blocks, data, sctx->state,
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partial ? sctx->buffer : NULL, 0);
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kernel_neon_end();
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data += blocks * SHA1_BLOCK_SIZE;
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partial = 0;
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}
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if (len)
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memcpy(sctx->buffer + partial, data, len);
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return 0;
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}
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static int sha1_final(struct shash_desc *desc, u8 *out)
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{
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static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
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struct sha1_state *sctx = shash_desc_ctx(desc);
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__be64 bits = cpu_to_be64(sctx->count << 3);
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__be32 *dst = (__be32 *)out;
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int i;
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u32 padlen = SHA1_BLOCK_SIZE
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- ((sctx->count + sizeof(bits)) % SHA1_BLOCK_SIZE);
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sha1_update(desc, padding, padlen);
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sha1_update(desc, (const u8 *)&bits, sizeof(bits));
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for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha1_state){};
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return 0;
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}
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static int sha1_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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int blocks;
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int i;
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if (sctx->count || !len || (len % SHA1_BLOCK_SIZE)) {
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sha1_update(desc, data, len);
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return sha1_final(desc, out);
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}
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/*
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* Use a fast path if the input is a multiple of 64 bytes. In
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* this case, there is no need to copy data around, and we can
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* perform the entire digest calculation in a single invocation
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* of sha1_ce_transform()
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*/
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blocks = len / SHA1_BLOCK_SIZE;
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kernel_neon_begin_partial(16);
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sha1_ce_transform(blocks, data, sctx->state, NULL, len);
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kernel_neon_end();
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for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha1_state){};
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return 0;
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}
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static int sha1_export(struct shash_desc *desc, void *out)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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struct sha1_state *dst = out;
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*dst = *sctx;
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return 0;
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}
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static int sha1_import(struct shash_desc *desc, const void *in)
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{
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struct sha1_state *sctx = shash_desc_ctx(desc);
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struct sha1_state const *src = in;
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*sctx = *src;
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return 0;
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}
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static struct shash_alg alg = {
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.init = sha1_init,
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.update = sha1_update,
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.final = sha1_final,
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.finup = sha1_finup,
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.export = sha1_export,
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.import = sha1_import,
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.descsize = sizeof(struct sha1_state),
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.digestsize = SHA1_DIGEST_SIZE,
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.statesize = sizeof(struct sha1_state),
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.base = {
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.cra_name = "sha1",
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.cra_driver_name = "sha1-ce",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA1_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init sha1_ce_mod_init(void)
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{
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return crypto_register_shash(&alg);
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}
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static void __exit sha1_ce_mod_fini(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_cpu_feature_match(SHA1, sha1_ce_mod_init);
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module_exit(sha1_ce_mod_fini);
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