159 lines
4.1 KiB
C
159 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* sha3-ce-glue.c - core SHA-3 transform using v8.2 Crypto Extensions
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*
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* Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <asm/hwcap.h>
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#include <asm/neon.h>
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#include <asm/simd.h>
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#include <asm/unaligned.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/sha3.h>
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#include <linux/cpufeature.h>
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#include <linux/crypto.h>
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#include <linux/module.h>
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MODULE_DESCRIPTION("SHA3 secure hash using ARMv8 Crypto Extensions");
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MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
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MODULE_LICENSE("GPL v2");
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asmlinkage void sha3_ce_transform(u64 *st, const u8 *data, int blocks,
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int md_len);
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static int sha3_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha3_state *sctx = shash_desc_ctx(desc);
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unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
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if (!crypto_simd_usable())
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return crypto_sha3_update(desc, data, len);
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if ((sctx->partial + len) >= sctx->rsiz) {
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int blocks;
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if (sctx->partial) {
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int p = sctx->rsiz - sctx->partial;
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memcpy(sctx->buf + sctx->partial, data, p);
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kernel_neon_begin();
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sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size);
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kernel_neon_end();
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data += p;
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len -= p;
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sctx->partial = 0;
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}
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blocks = len / sctx->rsiz;
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len %= sctx->rsiz;
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if (blocks) {
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kernel_neon_begin();
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sha3_ce_transform(sctx->st, data, blocks, digest_size);
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kernel_neon_end();
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data += blocks * sctx->rsiz;
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}
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}
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if (len) {
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memcpy(sctx->buf + sctx->partial, data, len);
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sctx->partial += len;
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}
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return 0;
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}
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static int sha3_final(struct shash_desc *desc, u8 *out)
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{
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struct sha3_state *sctx = shash_desc_ctx(desc);
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unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
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__le64 *digest = (__le64 *)out;
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int i;
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if (!crypto_simd_usable())
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return crypto_sha3_final(desc, out);
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sctx->buf[sctx->partial++] = 0x06;
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memset(sctx->buf + sctx->partial, 0, sctx->rsiz - sctx->partial);
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sctx->buf[sctx->rsiz - 1] |= 0x80;
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kernel_neon_begin();
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sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size);
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kernel_neon_end();
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for (i = 0; i < digest_size / 8; i++)
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put_unaligned_le64(sctx->st[i], digest++);
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if (digest_size & 4)
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put_unaligned_le32(sctx->st[i], (__le32 *)digest);
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*sctx = (struct sha3_state){};
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return 0;
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}
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static struct shash_alg algs[] = { {
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.digestsize = SHA3_224_DIGEST_SIZE,
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.init = crypto_sha3_init,
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.update = sha3_update,
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.final = sha3_final,
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.descsize = sizeof(struct sha3_state),
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.base.cra_name = "sha3-224",
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.base.cra_driver_name = "sha3-224-ce",
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.base.cra_blocksize = SHA3_224_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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.base.cra_priority = 200,
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}, {
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.digestsize = SHA3_256_DIGEST_SIZE,
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.init = crypto_sha3_init,
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.update = sha3_update,
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.final = sha3_final,
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.descsize = sizeof(struct sha3_state),
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.base.cra_name = "sha3-256",
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.base.cra_driver_name = "sha3-256-ce",
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.base.cra_blocksize = SHA3_256_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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.base.cra_priority = 200,
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}, {
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.digestsize = SHA3_384_DIGEST_SIZE,
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.init = crypto_sha3_init,
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.update = sha3_update,
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.final = sha3_final,
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.descsize = sizeof(struct sha3_state),
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.base.cra_name = "sha3-384",
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.base.cra_driver_name = "sha3-384-ce",
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.base.cra_blocksize = SHA3_384_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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.base.cra_priority = 200,
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}, {
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.digestsize = SHA3_512_DIGEST_SIZE,
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.init = crypto_sha3_init,
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.update = sha3_update,
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.final = sha3_final,
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.descsize = sizeof(struct sha3_state),
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.base.cra_name = "sha3-512",
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.base.cra_driver_name = "sha3-512-ce",
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.base.cra_blocksize = SHA3_512_BLOCK_SIZE,
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.base.cra_module = THIS_MODULE,
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.base.cra_priority = 200,
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} };
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static int __init sha3_neon_mod_init(void)
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{
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return crypto_register_shashes(algs, ARRAY_SIZE(algs));
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}
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static void __exit sha3_neon_mod_fini(void)
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{
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crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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}
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module_cpu_feature_match(SHA3, sha3_neon_mod_init);
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module_exit(sha3_neon_mod_fini);
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