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// SPDX-License-Identifier: GPL-2.0
/*
* sha512-ce-glue.c - SHA-384/SHA-512 using ARMv8 Crypto Extensions
*
* Copyright (C) 2018 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 <linux/unaligned.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/simd.h>
#include <crypto/sha2.h>
#include <crypto/sha512_base.h>
#include <linux/cpufeature.h>
#include <linux/crypto.h>
#include <linux/module.h>
MODULE_DESCRIPTION("SHA-384/SHA-512 secure hash using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_CRYPTO("sha384");
MODULE_ALIAS_CRYPTO("sha512");
asmlinkage int __sha512_ce_transform(struct sha512_state *sst, u8 const *src,
int blocks);
asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
static void sha512_ce_transform(struct sha512_state *sst, u8 const *src,
int blocks)
{
while (blocks) {
int rem;
kernel_neon_begin();
rem = __sha512_ce_transform(sst, src, blocks);
kernel_neon_end();
src += (blocks - rem) * SHA512_BLOCK_SIZE;
blocks = rem;
}
}
static void sha512_arm64_transform(struct sha512_state *sst, u8 const *src,
int blocks)
{
sha512_block_data_order(sst->state, src, blocks);
}
static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
sha512_block_fn *fn = crypto_simd_usable() ? sha512_ce_transform
: sha512_arm64_transform;
sha512_base_do_update(desc, data, len, fn);
return 0;
}
static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
sha512_block_fn *fn = crypto_simd_usable() ? sha512_ce_transform
: sha512_arm64_transform;
sha512_base_do_update(desc, data, len, fn);
sha512_base_do_finalize(desc, fn);
return sha512_base_finish(desc, out);
}
static int sha512_ce_final(struct shash_desc *desc, u8 *out)
{
sha512_block_fn *fn = crypto_simd_usable() ? sha512_ce_transform
: sha512_arm64_transform;
sha512_base_do_finalize(desc, fn);
return sha512_base_finish(desc, out);
}
static struct shash_alg algs[] = { {
.init = sha384_base_init,
.update = sha512_ce_update,
.final = sha512_ce_final,
.finup = sha512_ce_finup,
.descsize = sizeof(struct sha512_state),
.digestsize = SHA384_DIGEST_SIZE,
.base.cra_name = "sha384",
.base.cra_driver_name = "sha384-ce",
.base.cra_priority = 200,
.base.cra_blocksize = SHA512_BLOCK_SIZE,
.base.cra_module = THIS_MODULE,
}, {
.init = sha512_base_init,
.update = sha512_ce_update,
.final = sha512_ce_final,
.finup = sha512_ce_finup,
.descsize = sizeof(struct sha512_state),
.digestsize = SHA512_DIGEST_SIZE,
.base.cra_name = "sha512",
.base.cra_driver_name = "sha512-ce",
.base.cra_priority = 200,
.base.cra_blocksize = SHA512_BLOCK_SIZE,
.base.cra_module = THIS_MODULE,
} };
static int __init sha512_ce_mod_init(void)
{
return crypto_register_shashes(algs, ARRAY_SIZE(algs));
}
static void __exit sha512_ce_mod_fini(void)
{
crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
}
module_cpu_feature_match(SHA512, sha512_ce_mod_init);
module_exit(sha512_ce_mod_fini);
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