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crypto: arm64/sha1-ce - add non-SIMD generic fallback 

The arm64 kernel will shortly disallow nested kernel mode NEON, so
add a fallback to scalar C code that can be invoked in that case.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2017-07-24 11:28:08 +01:00 committed by Herbert Xu
parent 15c7d8f8a2
commit 0771f3234d
2 changed files with 16 additions and 5 deletions
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3
arch/arm64/crypto/Kconfig
View File

@ -18,8 +18,9 @@ config CRYPTO_SHA512_ARM64
config CRYPTO_SHA1_ARM64_CE
tristate "SHA-1 digest algorithm (ARMv8 Crypto Extensions)"
depends on ARM64 && KERNEL_MODE_NEON
depends on KERNEL_MODE_NEON
select CRYPTO_HASH
select CRYPTO_SHA1
config CRYPTO_SHA2_ARM64_CE
tristate "SHA-224/SHA-256 digest algorithm (ARMv8 Crypto Extensions)"

18
arch/arm64/crypto/sha1-ce-glue.c
View File

@ -1,7 +1,7 @@
/*
* sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
*
* Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
* Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
*
* 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
@ -9,6 +9,7 @@
*/
#include <asm/neon.h>
#include <asm/simd.h>
#include <asm/unaligned.h>
#include <crypto/internal/hash.h>
#include <crypto/sha.h>
@ -37,8 +38,11 @@ static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
{
struct sha1_ce_state *sctx = shash_desc_ctx(desc);
if (!may_use_simd())
return crypto_sha1_update(desc, data, len);
sctx->finalize = 0;
kernel_neon_begin_partial(16);
kernel_neon_begin();
sha1_base_do_update(desc, data, len,
(sha1_block_fn *)sha1_ce_transform);
kernel_neon_end();
@ -52,13 +56,16 @@ static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
struct sha1_ce_state *sctx = shash_desc_ctx(desc);
bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE);
if (!may_use_simd())
return crypto_sha1_finup(desc, data, len, out);
/*
* Allow the asm code to perform the finalization if there is no
* partial data and the input is a round multiple of the block size.
*/
sctx->finalize = finalize;
kernel_neon_begin_partial(16);
kernel_neon_begin();
sha1_base_do_update(desc, data, len,
(sha1_block_fn *)sha1_ce_transform);
if (!finalize)
@ -71,8 +78,11 @@ static int sha1_ce_final(struct shash_desc *desc, u8 *out)
{
struct sha1_ce_state *sctx = shash_desc_ctx(desc);
if (!may_use_simd())
return crypto_sha1_finup(desc, NULL, 0, out);
sctx->finalize = 0;
kernel_neon_begin_partial(16);
kernel_neon_begin();
sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
kernel_neon_end();
return sha1_base_finish(desc, out);