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arm64/crypto: GHASH secure hash using ARMv8 Crypto Extensions
This is a port to ARMv8 (Crypto Extensions) of the Intel implementation of the GHASH Secure Hash (used in the Galois/Counter chaining mode). It relies on the optional PMULL/PMULL2 instruction (polynomial multiply long, what Intel call carry-less multiply). 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
6ba6c74dfc
commit
fdd2389457
@ -18,4 +18,10 @@ config CRYPTO_SHA2_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_GHASH_ARM64_CE
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tristate "GHASH (for GCM chaining mode) using 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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@ -13,3 +13,6 @@ sha1-ce-y := sha1-ce-glue.o sha1-ce-core.o
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obj-$(CONFIG_CRYPTO_SHA2_ARM64_CE) += sha2-ce.o
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sha2-ce-y := sha2-ce-glue.o sha2-ce-core.o
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obj-$(CONFIG_CRYPTO_GHASH_ARM64_CE) += ghash-ce.o
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ghash-ce-y := ghash-ce-glue.o ghash-ce-core.o
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95
arch/arm64/crypto/ghash-ce-core.S
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95
arch/arm64/crypto/ghash-ce-core.S
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@ -0,0 +1,95 @@
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/*
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* Accelerated GHASH implementation with ARMv8 PMULL instructions.
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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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* Based on arch/x86/crypto/ghash-pmullni-intel_asm.S
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*
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* Copyright (c) 2009 Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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* Vinodh Gopal
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* Erdinc Ozturk
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* Deniz Karakoyunlu
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* 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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DATA .req v0
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SHASH .req v1
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IN1 .req v2
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T1 .req v2
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T2 .req v3
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T3 .req v4
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VZR .req v5
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.text
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.arch armv8-a+crypto
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/*
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* void pmull_ghash_update(int blocks, u64 dg[], const char *src,
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* struct ghash_key const *k, const char *head)
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*/
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ENTRY(pmull_ghash_update)
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ld1 {DATA.16b}, [x1]
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ld1 {SHASH.16b}, [x3]
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eor VZR.16b, VZR.16b, VZR.16b
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/* do the head block first, if supplied */
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cbz x4, 0f
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ld1 {IN1.2d}, [x4]
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b 1f
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0: ld1 {IN1.2d}, [x2], #16
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sub w0, w0, #1
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1: ext IN1.16b, IN1.16b, IN1.16b, #8
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CPU_LE( rev64 IN1.16b, IN1.16b )
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eor DATA.16b, DATA.16b, IN1.16b
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/* multiply DATA by SHASH in GF(2^128) */
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ext T2.16b, DATA.16b, DATA.16b, #8
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ext T3.16b, SHASH.16b, SHASH.16b, #8
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eor T2.16b, T2.16b, DATA.16b
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eor T3.16b, T3.16b, SHASH.16b
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pmull2 T1.1q, SHASH.2d, DATA.2d // a1 * b1
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pmull DATA.1q, SHASH.1d, DATA.1d // a0 * b0
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pmull T2.1q, T2.1d, T3.1d // (a1 + a0)(b1 + b0)
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eor T2.16b, T2.16b, T1.16b // (a0 * b1) + (a1 * b0)
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eor T2.16b, T2.16b, DATA.16b
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ext T3.16b, VZR.16b, T2.16b, #8
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ext T2.16b, T2.16b, VZR.16b, #8
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eor DATA.16b, DATA.16b, T3.16b
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eor T1.16b, T1.16b, T2.16b // <T1:DATA> is result of
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// carry-less multiplication
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/* first phase of the reduction */
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shl T3.2d, DATA.2d, #1
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eor T3.16b, T3.16b, DATA.16b
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shl T3.2d, T3.2d, #5
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eor T3.16b, T3.16b, DATA.16b
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shl T3.2d, T3.2d, #57
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ext T2.16b, VZR.16b, T3.16b, #8
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ext T3.16b, T3.16b, VZR.16b, #8
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eor DATA.16b, DATA.16b, T2.16b
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eor T1.16b, T1.16b, T3.16b
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/* second phase of the reduction */
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ushr T2.2d, DATA.2d, #5
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eor T2.16b, T2.16b, DATA.16b
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ushr T2.2d, T2.2d, #1
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eor T2.16b, T2.16b, DATA.16b
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ushr T2.2d, T2.2d, #1
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eor T1.16b, T1.16b, T2.16b
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eor DATA.16b, DATA.16b, T1.16b
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cbnz w0, 0b
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st1 {DATA.16b}, [x1]
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ret
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ENDPROC(pmull_ghash_update)
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155
arch/arm64/crypto/ghash-ce-glue.c
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155
arch/arm64/crypto/ghash-ce-glue.c
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@ -0,0 +1,155 @@
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/*
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* Accelerated GHASH implementation with ARMv8 PMULL instructions.
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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 it
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* under the terms of the GNU General Public License version 2 as published
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* 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 <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("GHASH 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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#define GHASH_BLOCK_SIZE 16
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#define GHASH_DIGEST_SIZE 16
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struct ghash_key {
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u64 a;
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u64 b;
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};
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struct ghash_desc_ctx {
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u64 digest[GHASH_DIGEST_SIZE/sizeof(u64)];
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u8 buf[GHASH_BLOCK_SIZE];
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u32 count;
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};
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asmlinkage void pmull_ghash_update(int blocks, u64 dg[], const char *src,
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struct ghash_key const *k, const char *head);
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static int ghash_init(struct shash_desc *desc)
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{
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struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
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*ctx = (struct ghash_desc_ctx){};
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return 0;
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}
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static int ghash_update(struct shash_desc *desc, const u8 *src,
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unsigned int len)
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{
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struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
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unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
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ctx->count += len;
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if ((partial + len) >= GHASH_BLOCK_SIZE) {
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struct ghash_key *key = crypto_shash_ctx(desc->tfm);
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int blocks;
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if (partial) {
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int p = GHASH_BLOCK_SIZE - partial;
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memcpy(ctx->buf + partial, src, p);
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src += p;
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len -= p;
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}
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blocks = len / GHASH_BLOCK_SIZE;
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len %= GHASH_BLOCK_SIZE;
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kernel_neon_begin_partial(6);
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pmull_ghash_update(blocks, ctx->digest, src, key,
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partial ? ctx->buf : NULL);
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kernel_neon_end();
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src += blocks * GHASH_BLOCK_SIZE;
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}
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if (len)
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memcpy(ctx->buf + partial, src, len);
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return 0;
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}
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static int ghash_final(struct shash_desc *desc, u8 *dst)
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{
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struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
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unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
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if (partial) {
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struct ghash_key *key = crypto_shash_ctx(desc->tfm);
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memset(ctx->buf + partial, 0, GHASH_BLOCK_SIZE - partial);
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kernel_neon_begin_partial(6);
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pmull_ghash_update(1, ctx->digest, ctx->buf, key, NULL);
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kernel_neon_end();
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}
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put_unaligned_be64(ctx->digest[1], dst);
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put_unaligned_be64(ctx->digest[0], dst + 8);
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*ctx = (struct ghash_desc_ctx){};
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return 0;
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}
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static int ghash_setkey(struct crypto_shash *tfm,
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const u8 *inkey, unsigned int keylen)
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{
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struct ghash_key *key = crypto_shash_ctx(tfm);
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u64 a, b;
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if (keylen != GHASH_BLOCK_SIZE) {
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crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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/* perform multiplication by 'x' in GF(2^128) */
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b = get_unaligned_be64(inkey);
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a = get_unaligned_be64(inkey + 8);
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key->a = (a << 1) | (b >> 63);
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key->b = (b << 1) | (a >> 63);
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if (b >> 63)
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key->b ^= 0xc200000000000000UL;
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return 0;
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}
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static struct shash_alg ghash_alg = {
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.digestsize = GHASH_DIGEST_SIZE,
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.init = ghash_init,
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.update = ghash_update,
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.final = ghash_final,
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.setkey = ghash_setkey,
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.descsize = sizeof(struct ghash_desc_ctx),
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.base = {
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.cra_name = "ghash",
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.cra_driver_name = "ghash-ce",
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.cra_priority = 200,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = GHASH_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct ghash_key),
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.cra_module = THIS_MODULE,
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},
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};
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static int __init ghash_ce_mod_init(void)
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{
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return crypto_register_shash(&ghash_alg);
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}
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static void __exit ghash_ce_mod_exit(void)
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{
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crypto_unregister_shash(&ghash_alg);
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}
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module_cpu_feature_match(PMULL, ghash_ce_mod_init);
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module_exit(ghash_ce_mod_exit);
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