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arm64/crypto: SHA-224/SHA-256 using ARMv8 Crypto Extensions
This patch adds support for the SHA-224 and SHA-256 Secure Hash Algorithms for CPUs that have support for the SHA-2 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>
This commit is contained in:
Ard Biesheuvel
parent
2c98833a42
commit
6ba6c74dfc
@ -13,4 +13,9 @@ config CRYPTO_SHA1_ARM64_CE
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depends on ARM64 && KERNEL_MODE_NEON
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select CRYPTO_HASH
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config CRYPTO_SHA2_ARM64_CE
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tristate "SHA-224/SHA-256 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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@ -10,3 +10,6 @@
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obj-$(CONFIG_CRYPTO_SHA1_ARM64_CE) += sha1-ce.o
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sha1-ce-y := sha1-ce-glue.o sha1-ce-core.o
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obj-$(CONFIG_CRYPTO_SHA2_ARM64_CE) += sha2-ce.o
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sha2-ce-y := sha2-ce-glue.o sha2-ce-core.o
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156
arch/arm64/crypto/sha2-ce-core.S
Normal file
156
arch/arm64/crypto/sha2-ce-core.S
Normal file
@ -0,0 +1,156 @@
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/*
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* sha2-ce-core.S - core SHA-224/SHA-256 transform using v8 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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dga .req q20
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dgav .req v20
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dgb .req q21
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dgbv .req v21
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t0 .req v22
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t1 .req v23
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dg0q .req q24
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dg0v .req v24
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dg1q .req q25
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dg1v .req v25
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dg2q .req q26
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dg2v .req v26
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.macro add_only, ev, rc, s0
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mov dg2v.16b, dg0v.16b
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.ifeq \ev
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add t1.4s, v\s0\().4s, \rc\().4s
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sha256h dg0q, dg1q, t0.4s
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sha256h2 dg1q, dg2q, t0.4s
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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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sha256h dg0q, dg1q, t1.4s
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sha256h2 dg1q, dg2q, t1.4s
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.endif
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.endm
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.macro add_update, ev, rc, s0, s1, s2, s3
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sha256su0 v\s0\().4s, v\s1\().4s
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add_only \ev, \rc, \s1
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sha256su1 v\s0\().4s, v\s2\().4s, v\s3\().4s
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.endm
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/*
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* The SHA-256 round constants
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*/
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.align 4
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.Lsha2_rcon:
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.word 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5
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.word 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5
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.word 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3
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.word 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174
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.word 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc
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.word 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da
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.word 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7
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.word 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967
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.word 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13
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.word 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85
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.word 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3
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.word 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070
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.word 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5
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.word 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3
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.word 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208
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.word 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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/*
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* void sha2_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(sha2_ce_transform)
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/* load round constants */
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adr x8, .Lsha2_rcon
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ld1 { v0.4s- v3.4s}, [x8], #64
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ld1 { v4.4s- v7.4s}, [x8], #64
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ld1 { v8.4s-v11.4s}, [x8], #64
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ld1 {v12.4s-v15.4s}, [x8]
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/* load state */
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ldp dga, dgb, [x2]
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/* load partial input (if supplied) */
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cbz x3, 0f
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ld1 {v16.4s-v19.4s}, [x3]
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b 1f
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/* load input */
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0: ld1 {v16.4s-v19.4s}, [x1], #64
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sub w0, w0, #1
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1:
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CPU_LE( rev32 v16.16b, v16.16b )
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CPU_LE( rev32 v17.16b, v17.16b )
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CPU_LE( rev32 v18.16b, v18.16b )
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CPU_LE( rev32 v19.16b, v19.16b )
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2: add t0.4s, v16.4s, v0.4s
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mov dg0v.16b, dgav.16b
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mov dg1v.16b, dgbv.16b
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add_update 0, v1, 16, 17, 18, 19
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add_update 1, v2, 17, 18, 19, 16
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add_update 0, v3, 18, 19, 16, 17
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add_update 1, v4, 19, 16, 17, 18
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add_update 0, v5, 16, 17, 18, 19
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add_update 1, v6, 17, 18, 19, 16
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add_update 0, v7, 18, 19, 16, 17
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add_update 1, v8, 19, 16, 17, 18
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add_update 0, v9, 16, 17, 18, 19
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add_update 1, v10, 17, 18, 19, 16
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add_update 0, v11, 18, 19, 16, 17
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add_update 1, v12, 19, 16, 17, 18
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add_only 0, v13, 17
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add_only 1, v14, 18
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add_only 0, v15, 19
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add_only 1
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/* update state */
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add dgav.4s, dgav.4s, dg0v.4s
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add dgbv.4s, dgbv.4s, dg1v.4s
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/* handled all input blocks? */
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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 v17.2d, #0
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mov x8, #0x80000000
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movi v18.2d, #0
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ror x7, x4, #29 // ror(lsl(x4, 3), 32)
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fmov d16, x8
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mov x4, #0
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mov v19.d[0], xzr
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mov v19.d[1], x7
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b 2b
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/* store new state */
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3: stp dga, dgb, [x2]
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ret
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ENDPROC(sha2_ce_transform)
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255
arch/arm64/crypto/sha2-ce-glue.c
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255
arch/arm64/crypto/sha2-ce-glue.c
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@ -0,0 +1,255 @@
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/*
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* sha2-ce-glue.c - SHA-224/SHA-256 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("SHA-224/SHA-256 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 int sha2_ce_transform(int blocks, u8 const *src, u32 *state,
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u8 *head, long bytes);
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static int sha224_init(struct shash_desc *desc)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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*sctx = (struct sha256_state){
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.state = {
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SHA224_H0, SHA224_H1, SHA224_H2, SHA224_H3,
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SHA224_H4, SHA224_H5, SHA224_H6, SHA224_H7,
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}
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};
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return 0;
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}
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static int sha256_init(struct shash_desc *desc)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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*sctx = (struct sha256_state){
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.state = {
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SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,
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SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7,
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}
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};
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return 0;
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}
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static int sha2_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
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sctx->count += len;
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if ((partial + len) >= SHA256_BLOCK_SIZE) {
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int blocks;
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if (partial) {
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int p = SHA256_BLOCK_SIZE - partial;
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memcpy(sctx->buf + 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 / SHA256_BLOCK_SIZE;
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len %= SHA256_BLOCK_SIZE;
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kernel_neon_begin_partial(28);
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sha2_ce_transform(blocks, data, sctx->state,
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partial ? sctx->buf : NULL, 0);
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kernel_neon_end();
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data += blocks * SHA256_BLOCK_SIZE;
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partial = 0;
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}
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if (len)
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memcpy(sctx->buf + partial, data, len);
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return 0;
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}
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static void sha2_final(struct shash_desc *desc)
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{
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static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
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struct sha256_state *sctx = shash_desc_ctx(desc);
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__be64 bits = cpu_to_be64(sctx->count << 3);
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u32 padlen = SHA256_BLOCK_SIZE
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- ((sctx->count + sizeof(bits)) % SHA256_BLOCK_SIZE);
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sha2_update(desc, padding, padlen);
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sha2_update(desc, (const u8 *)&bits, sizeof(bits));
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}
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static int sha224_final(struct shash_desc *desc, u8 *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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int i;
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sha2_final(desc);
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for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha256_state){};
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return 0;
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}
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static int sha256_final(struct shash_desc *desc, u8 *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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int i;
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sha2_final(desc);
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for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha256_state){};
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return 0;
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}
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static void sha2_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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int blocks;
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if (sctx->count || !len || (len % SHA256_BLOCK_SIZE)) {
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sha2_update(desc, data, len);
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sha2_final(desc);
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return;
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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 sha2_ce_transform()
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*/
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blocks = len / SHA256_BLOCK_SIZE;
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kernel_neon_begin_partial(28);
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sha2_ce_transform(blocks, data, sctx->state, NULL, len);
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kernel_neon_end();
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data += blocks * SHA256_BLOCK_SIZE;
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}
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static int sha224_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 sha256_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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int i;
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sha2_finup(desc, data, len);
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for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha256_state){};
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return 0;
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}
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static int sha256_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 sha256_state *sctx = shash_desc_ctx(desc);
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__be32 *dst = (__be32 *)out;
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int i;
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sha2_finup(desc, data, len);
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for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(__be32); i++)
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put_unaligned_be32(sctx->state[i], dst++);
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*sctx = (struct sha256_state){};
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return 0;
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}
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static int sha2_export(struct shash_desc *desc, void *out)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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struct sha256_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 sha2_import(struct shash_desc *desc, const void *in)
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{
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struct sha256_state *sctx = shash_desc_ctx(desc);
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struct sha256_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 algs[] = { {
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.init = sha224_init,
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.update = sha2_update,
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.final = sha224_final,
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.finup = sha224_finup,
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.export = sha2_export,
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.import = sha2_import,
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.descsize = sizeof(struct sha256_state),
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.digestsize = SHA224_DIGEST_SIZE,
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha224",
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.cra_driver_name = "sha224-ce",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA256_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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}, {
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.init = sha256_init,
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.update = sha2_update,
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.final = sha256_final,
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.finup = sha256_finup,
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.export = sha2_export,
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.import = sha2_import,
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.descsize = sizeof(struct sha256_state),
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.digestsize = SHA256_DIGEST_SIZE,
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.statesize = sizeof(struct sha256_state),
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.base = {
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.cra_name = "sha256",
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.cra_driver_name = "sha256-ce",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA256_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 sha2_ce_mod_init(void)
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{
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return crypto_register_shashes(algs, ARRAY_SIZE(algs));
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}
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static void __exit sha2_ce_mod_fini(void)
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{
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crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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}
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module_cpu_feature_match(SHA2, sha2_ce_mod_init);
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module_exit(sha2_ce_mod_fini);
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