79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
// 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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* (ARM64 NEON accelerated version)
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*
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* Copyright 2018 Google LLC
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*/
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#include <asm/neon.h>
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#include <asm/simd.h>
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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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asmlinkage void nh_neon(const u32 *key, const u8 *message, size_t message_len,
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u8 hash[NH_HASH_BYTES]);
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/* wrapper to avoid indirect call to assembly, which doesn't work with CFI */
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static void _nh_neon(const u32 *key, const u8 *message, size_t message_len,
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__le64 hash[NH_NUM_PASSES])
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{
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nh_neon(key, message, message_len, (u8 *)hash);
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}
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static int nhpoly1305_neon_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, PAGE_SIZE);
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kernel_neon_begin();
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crypto_nhpoly1305_update_helper(desc, src, n, _nh_neon);
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kernel_neon_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 struct shash_alg nhpoly1305_alg = {
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.base.cra_name = "nhpoly1305",
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.base.cra_driver_name = "nhpoly1305-neon",
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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_neon_update,
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.final = crypto_nhpoly1305_final,
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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 (!cpu_have_named_feature(ASIMD))
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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 (NEON-accelerated)");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
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MODULE_ALIAS_CRYPTO("nhpoly1305");
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MODULE_ALIAS_CRYPTO("nhpoly1305-neon");
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