cregit-Linux how code gets into the kernel

Release 4.17 arch/arm64/crypto/sha3-ce-glue.c

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * sha3-ce-glue.c - core SHA-3 transform using v8.2 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/hwcap.h>
#include <asm/neon.h>
#include <asm/simd.h>
#include <asm/unaligned.h>
#include <crypto/internal/hash.h>
#include <crypto/sha3.h>
#include <linux/cpufeature.h>
#include <linux/crypto.h>
#include <linux/module.h>

MODULE_DESCRIPTION("SHA3 secure hash using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");

asmlinkage void sha3_ce_transform(u64 *st, const u8 *data, int blocks,
				  int md_len);


static int sha3_update(struct shash_desc *desc, const u8 *data, unsigned int len) { struct sha3_state *sctx = shash_desc_ctx(desc); unsigned int digest_size = crypto_shash_digestsize(desc->tfm); if (!may_use_simd()) return crypto_sha3_update(desc, data, len); if ((sctx->partial + len) >= sctx->rsiz) { int blocks; if (sctx->partial) { int p = sctx->rsiz - sctx->partial; memcpy(sctx->buf + sctx->partial, data, p); kernel_neon_begin(); sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size); kernel_neon_end(); data += p; len -= p; sctx->partial = 0; } blocks = len / sctx->rsiz; len %= sctx->rsiz; if (blocks) { kernel_neon_begin(); sha3_ce_transform(sctx->st, data, blocks, digest_size); kernel_neon_end(); data += blocks * sctx->rsiz; } } if (len) { memcpy(sctx->buf + sctx->partial, data, len); sctx->partial += len; } return 0; }

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static int sha3_final(struct shash_desc *desc, u8 *out) { struct sha3_state *sctx = shash_desc_ctx(desc); unsigned int digest_size = crypto_shash_digestsize(desc->tfm); __le64 *digest = (__le64 *)out; int i; if (!may_use_simd()) return crypto_sha3_final(desc, out); sctx->buf[sctx->partial++] = 0x06; memset(sctx->buf + sctx->partial, 0, sctx->rsiz - sctx->partial); sctx->buf[sctx->rsiz - 1] |= 0x80; kernel_neon_begin(); sha3_ce_transform(sctx->st, sctx->buf, 1, digest_size); kernel_neon_end(); for (i = 0; i < digest_size / 8; i++) put_unaligned_le64(sctx->st[i], digest++); if (digest_size & 4) put_unaligned_le32(sctx->st[i], (__le32 *)digest); *sctx = (struct sha3_state){}; return 0; }

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static struct shash_alg algs[] = { { .digestsize = SHA3_224_DIGEST_SIZE, .init = crypto_sha3_init, .update = sha3_update, .final = sha3_final, .descsize = sizeof(struct sha3_state), .base.cra_name = "sha3-224", .base.cra_driver_name = "sha3-224-ce", .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, .base.cra_blocksize = SHA3_224_BLOCK_SIZE, .base.cra_module = THIS_MODULE, .base.cra_priority = 200, }, { .digestsize = SHA3_256_DIGEST_SIZE, .init = crypto_sha3_init, .update = sha3_update, .final = sha3_final, .descsize = sizeof(struct sha3_state), .base.cra_name = "sha3-256", .base.cra_driver_name = "sha3-256-ce", .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, .base.cra_blocksize = SHA3_256_BLOCK_SIZE, .base.cra_module = THIS_MODULE, .base.cra_priority = 200, }, { .digestsize = SHA3_384_DIGEST_SIZE, .init = crypto_sha3_init, .update = sha3_update, .final = sha3_final, .descsize = sizeof(struct sha3_state), .base.cra_name = "sha3-384", .base.cra_driver_name = "sha3-384-ce", .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, .base.cra_blocksize = SHA3_384_BLOCK_SIZE, .base.cra_module = THIS_MODULE, .base.cra_priority = 200, }, { .digestsize = SHA3_512_DIGEST_SIZE, .init = crypto_sha3_init, .update = sha3_update, .final = sha3_final, .descsize = sizeof(struct sha3_state), .base.cra_name = "sha3-512", .base.cra_driver_name = "sha3-512-ce", .base.cra_flags = CRYPTO_ALG_TYPE_SHASH, .base.cra_blocksize = SHA3_512_BLOCK_SIZE, .base.cra_module = THIS_MODULE, .base.cra_priority = 200, } };
static int __init sha3_neon_mod_init(void) { return crypto_register_shashes(algs, ARRAY_SIZE(algs)); }

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static void __exit sha3_neon_mod_fini(void) { crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); }

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module_cpu_feature_match(SHA3, sha3_neon_mod_init); module_exit(sha3_neon_mod_fini);

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