mirror of
https://github.com/torvalds/linux.git
synced 2024-11-19 10:31:48 +00:00
da1793312f
The arm64 kernel will shortly disallow nested kernel mode NEON, so add a fallback to scalar 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>
150 lines
4.0 KiB
C
150 lines
4.0 KiB
C
/*
|
|
* sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
|
|
*
|
|
* 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
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <asm/neon.h>
|
|
#include <asm/simd.h>
|
|
#include <asm/unaligned.h>
|
|
#include <crypto/internal/hash.h>
|
|
#include <crypto/sha.h>
|
|
#include <crypto/sha256_base.h>
|
|
#include <linux/cpufeature.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/module.h>
|
|
|
|
MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
|
|
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
struct sha256_ce_state {
|
|
struct sha256_state sst;
|
|
u32 finalize;
|
|
};
|
|
|
|
asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
|
|
int blocks);
|
|
|
|
const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
|
|
sst.count);
|
|
const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
|
|
finalize);
|
|
|
|
asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
|
|
|
|
static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len)
|
|
{
|
|
struct sha256_ce_state *sctx = shash_desc_ctx(desc);
|
|
|
|
if (!may_use_simd())
|
|
return sha256_base_do_update(desc, data, len,
|
|
(sha256_block_fn *)sha256_block_data_order);
|
|
|
|
sctx->finalize = 0;
|
|
kernel_neon_begin();
|
|
sha256_base_do_update(desc, data, len,
|
|
(sha256_block_fn *)sha2_ce_transform);
|
|
kernel_neon_end();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
|
|
unsigned int len, u8 *out)
|
|
{
|
|
struct sha256_ce_state *sctx = shash_desc_ctx(desc);
|
|
bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE);
|
|
|
|
if (!may_use_simd()) {
|
|
if (len)
|
|
sha256_base_do_update(desc, data, len,
|
|
(sha256_block_fn *)sha256_block_data_order);
|
|
sha256_base_do_finalize(desc,
|
|
(sha256_block_fn *)sha256_block_data_order);
|
|
return sha256_base_finish(desc, 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();
|
|
sha256_base_do_update(desc, data, len,
|
|
(sha256_block_fn *)sha2_ce_transform);
|
|
if (!finalize)
|
|
sha256_base_do_finalize(desc,
|
|
(sha256_block_fn *)sha2_ce_transform);
|
|
kernel_neon_end();
|
|
return sha256_base_finish(desc, out);
|
|
}
|
|
|
|
static int sha256_ce_final(struct shash_desc *desc, u8 *out)
|
|
{
|
|
struct sha256_ce_state *sctx = shash_desc_ctx(desc);
|
|
|
|
if (!may_use_simd()) {
|
|
sha256_base_do_finalize(desc,
|
|
(sha256_block_fn *)sha256_block_data_order);
|
|
return sha256_base_finish(desc, out);
|
|
}
|
|
|
|
sctx->finalize = 0;
|
|
kernel_neon_begin();
|
|
sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
|
|
kernel_neon_end();
|
|
return sha256_base_finish(desc, out);
|
|
}
|
|
|
|
static struct shash_alg algs[] = { {
|
|
.init = sha224_base_init,
|
|
.update = sha256_ce_update,
|
|
.final = sha256_ce_final,
|
|
.finup = sha256_ce_finup,
|
|
.descsize = sizeof(struct sha256_ce_state),
|
|
.digestsize = SHA224_DIGEST_SIZE,
|
|
.base = {
|
|
.cra_name = "sha224",
|
|
.cra_driver_name = "sha224-ce",
|
|
.cra_priority = 200,
|
|
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
|
|
.cra_blocksize = SHA256_BLOCK_SIZE,
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
}, {
|
|
.init = sha256_base_init,
|
|
.update = sha256_ce_update,
|
|
.final = sha256_ce_final,
|
|
.finup = sha256_ce_finup,
|
|
.descsize = sizeof(struct sha256_ce_state),
|
|
.digestsize = SHA256_DIGEST_SIZE,
|
|
.base = {
|
|
.cra_name = "sha256",
|
|
.cra_driver_name = "sha256-ce",
|
|
.cra_priority = 200,
|
|
.cra_flags = CRYPTO_ALG_TYPE_SHASH,
|
|
.cra_blocksize = SHA256_BLOCK_SIZE,
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
} };
|
|
|
|
static int __init sha2_ce_mod_init(void)
|
|
{
|
|
return crypto_register_shashes(algs, ARRAY_SIZE(algs));
|
|
}
|
|
|
|
static void __exit sha2_ce_mod_fini(void)
|
|
{
|
|
crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
|
|
}
|
|
|
|
module_cpu_feature_match(SHA2, sha2_ce_mod_init);
|
|
module_exit(sha2_ce_mod_fini);
|