135 lines
3.1 KiB
C
135 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* SM3 Secure Hash Algorithm, AVX assembler accelerated.
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* specified in: https://datatracker.ietf.org/doc/html/draft-sca-cfrg-sm3-02
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*
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* Copyright (C) 2021 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <crypto/internal/hash.h>
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#include <crypto/internal/simd.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <crypto/sm3.h>
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#include <crypto/sm3_base.h>
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#include <asm/simd.h>
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asmlinkage void sm3_transform_avx(struct sm3_state *state,
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const u8 *data, int nblocks);
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static int sm3_avx_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sm3_state *sctx = shash_desc_ctx(desc);
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if (!crypto_simd_usable() ||
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(sctx->count % SM3_BLOCK_SIZE) + len < SM3_BLOCK_SIZE) {
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sm3_update(sctx, data, len);
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return 0;
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}
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/*
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* Make sure struct sm3_state begins directly with the SM3
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* 256-bit internal state, as this is what the asm functions expect.
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*/
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BUILD_BUG_ON(offsetof(struct sm3_state, state) != 0);
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kernel_fpu_begin();
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sm3_base_do_update(desc, data, len, sm3_transform_avx);
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kernel_fpu_end();
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return 0;
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}
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static int sm3_avx_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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if (!crypto_simd_usable()) {
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struct sm3_state *sctx = shash_desc_ctx(desc);
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if (len)
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sm3_update(sctx, data, len);
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sm3_final(sctx, out);
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return 0;
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}
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kernel_fpu_begin();
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if (len)
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sm3_base_do_update(desc, data, len, sm3_transform_avx);
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sm3_base_do_finalize(desc, sm3_transform_avx);
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kernel_fpu_end();
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return sm3_base_finish(desc, out);
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}
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static int sm3_avx_final(struct shash_desc *desc, u8 *out)
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{
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if (!crypto_simd_usable()) {
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sm3_final(shash_desc_ctx(desc), out);
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return 0;
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}
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kernel_fpu_begin();
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sm3_base_do_finalize(desc, sm3_transform_avx);
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kernel_fpu_end();
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return sm3_base_finish(desc, out);
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}
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static struct shash_alg sm3_avx_alg = {
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.digestsize = SM3_DIGEST_SIZE,
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.init = sm3_base_init,
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.update = sm3_avx_update,
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.final = sm3_avx_final,
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.finup = sm3_avx_finup,
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.descsize = sizeof(struct sm3_state),
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.base = {
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.cra_name = "sm3",
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.cra_driver_name = "sm3-avx",
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.cra_priority = 300,
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.cra_blocksize = SM3_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init sm3_avx_mod_init(void)
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{
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const char *feature_name;
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if (!boot_cpu_has(X86_FEATURE_AVX)) {
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pr_info("AVX instruction are not detected.\n");
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return -ENODEV;
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}
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if (!boot_cpu_has(X86_FEATURE_BMI2)) {
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pr_info("BMI2 instruction are not detected.\n");
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return -ENODEV;
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}
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if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
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&feature_name)) {
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pr_info("CPU feature '%s' is not supported.\n", feature_name);
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return -ENODEV;
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}
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return crypto_register_shash(&sm3_avx_alg);
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}
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static void __exit sm3_avx_mod_exit(void)
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{
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crypto_unregister_shash(&sm3_avx_alg);
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}
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module_init(sm3_avx_mod_init);
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module_exit(sm3_avx_mod_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Tianjia Zhang <tianjia.zhang@linux.alibaba.com>");
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MODULE_DESCRIPTION("SM3 Secure Hash Algorithm, AVX assembler accelerated");
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MODULE_ALIAS_CRYPTO("sm3");
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MODULE_ALIAS_CRYPTO("sm3-avx");
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