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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/crypto/nhpoly1305-sse2-glue.c
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// SPDX-License-Identifier: GPL-2.0

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/*

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 * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum

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 * (SSE2 accelerated version)

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 *

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 * Copyright 2018 Google LLC

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 */

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#include <crypto/internal/hash.h>

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#include <crypto/internal/simd.h>

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#include <crypto/nhpoly1305.h>

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#include <linux/module.h>

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#include <linux/sizes.h>

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#include <asm/simd.h>

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asmlinkage void nh_sse2(const u32 *key, const u8 *message, size_t message_len,

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			__le64 hash[NH_NUM_PASSES]);

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static int nhpoly1305_sse2_update(struct shash_desc *desc,

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				  const u8 *src, unsigned int srclen)

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{

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	if (srclen < 64 || !crypto_simd_usable())

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		return crypto_nhpoly1305_update(desc, src, srclen);

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	do {

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		unsigned int n = min_t(unsigned int, srclen, SZ_4K);

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		kernel_fpu_begin();

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		crypto_nhpoly1305_update_helper(desc, src, n, nh_sse2);

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		kernel_fpu_end();

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		src += n;

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		srclen -= n;

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	} while (srclen);

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	return 0;

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}

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static int nhpoly1305_sse2_digest(struct shash_desc *desc,

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				  const u8 *src, unsigned int srclen, u8 *out)

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{

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	return crypto_nhpoly1305_init(desc) ?:

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	       nhpoly1305_sse2_update(desc, src, srclen) ?:

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	       crypto_nhpoly1305_final(desc, out);

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}

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static struct shash_alg nhpoly1305_alg = {

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	.base.cra_name		= "nhpoly1305",

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	.base.cra_driver_name	= "nhpoly1305-sse2",

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	.base.cra_priority	= 200,

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	.base.cra_ctxsize	= sizeof(struct nhpoly1305_key),

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	.base.cra_module	= THIS_MODULE,

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	.digestsize		= POLY1305_DIGEST_SIZE,

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	.init			= crypto_nhpoly1305_init,

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	.update			= nhpoly1305_sse2_update,

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	.final			= crypto_nhpoly1305_final,

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	.digest			= nhpoly1305_sse2_digest,

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	.setkey			= crypto_nhpoly1305_setkey,

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	.descsize		= sizeof(struct nhpoly1305_state),

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};

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static int __init nhpoly1305_mod_init(void)

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{

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	if (!boot_cpu_has(X86_FEATURE_XMM2))

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		return -ENODEV;

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	return crypto_register_shash(&nhpoly1305_alg);

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}

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static void __exit nhpoly1305_mod_exit(void)

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{

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	crypto_unregister_shash(&nhpoly1305_alg);

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}

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module_init(nhpoly1305_mod_init);

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module_exit(nhpoly1305_mod_exit);

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MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (SSE2-accelerated)");

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MODULE_LICENSE("GPL v2");

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MODULE_AUTHOR("Eric Biggers <[email protected]>");

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MODULE_ALIAS_CRYPTO("nhpoly1305");

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MODULE_ALIAS_CRYPTO("nhpoly1305-sse2");

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