138 lines
3.7 KiB
C
138 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SHA-256 and SHA-224 using the RISC-V vector crypto extensions
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*
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* Copyright (C) 2022 VRULL GmbH
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* Author: Heiko Stuebner <heiko.stuebner@vrull.eu>
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*
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* Copyright (C) 2023 SiFive, Inc.
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* Author: Jerry Shih <jerry.shih@sifive.com>
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*/
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#include <asm/simd.h>
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#include <asm/vector.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/sha256_base.h>
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#include <linux/linkage.h>
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#include <linux/module.h>
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/*
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* Note: the asm function only uses the 'state' field of struct sha256_state.
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* It is assumed to be the first field.
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*/
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asmlinkage void sha256_transform_zvknha_or_zvknhb_zvkb(
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struct sha256_state *state, const u8 *data, int num_blocks);
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static int riscv64_sha256_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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/*
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* Ensure struct sha256_state begins directly with the SHA-256
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* 256-bit internal state, as this is what the asm function expects.
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*/
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BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
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if (crypto_simd_usable()) {
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kernel_vector_begin();
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sha256_base_do_update(desc, data, len,
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sha256_transform_zvknha_or_zvknhb_zvkb);
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kernel_vector_end();
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} else {
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crypto_sha256_update(desc, data, len);
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}
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return 0;
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}
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static int riscv64_sha256_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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kernel_vector_begin();
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if (len)
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sha256_base_do_update(
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desc, data, len,
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sha256_transform_zvknha_or_zvknhb_zvkb);
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sha256_base_do_finalize(
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desc, sha256_transform_zvknha_or_zvknhb_zvkb);
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kernel_vector_end();
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return sha256_base_finish(desc, out);
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}
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return crypto_sha256_finup(desc, data, len, out);
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}
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static int riscv64_sha256_final(struct shash_desc *desc, u8 *out)
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{
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return riscv64_sha256_finup(desc, NULL, 0, out);
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}
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static int riscv64_sha256_digest(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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return sha256_base_init(desc) ?:
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riscv64_sha256_finup(desc, data, len, out);
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}
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static struct shash_alg riscv64_sha256_algs[] = {
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{
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.init = sha256_base_init,
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.update = riscv64_sha256_update,
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.final = riscv64_sha256_final,
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.finup = riscv64_sha256_finup,
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.digest = riscv64_sha256_digest,
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.descsize = sizeof(struct sha256_state),
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.digestsize = SHA256_DIGEST_SIZE,
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.base = {
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.cra_blocksize = SHA256_BLOCK_SIZE,
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.cra_priority = 300,
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.cra_name = "sha256",
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.cra_driver_name = "sha256-riscv64-zvknha_or_zvknhb-zvkb",
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.cra_module = THIS_MODULE,
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},
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}, {
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.init = sha224_base_init,
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.update = riscv64_sha256_update,
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.final = riscv64_sha256_final,
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.finup = riscv64_sha256_finup,
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.descsize = sizeof(struct sha256_state),
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.digestsize = SHA224_DIGEST_SIZE,
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.base = {
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.cra_blocksize = SHA224_BLOCK_SIZE,
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.cra_priority = 300,
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.cra_name = "sha224",
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.cra_driver_name = "sha224-riscv64-zvknha_or_zvknhb-zvkb",
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.cra_module = THIS_MODULE,
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},
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},
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};
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static int __init riscv64_sha256_mod_init(void)
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{
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/* Both zvknha and zvknhb provide the SHA-256 instructions. */
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if ((riscv_isa_extension_available(NULL, ZVKNHA) ||
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riscv_isa_extension_available(NULL, ZVKNHB)) &&
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riscv_isa_extension_available(NULL, ZVKB) &&
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riscv_vector_vlen() >= 128)
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return crypto_register_shashes(riscv64_sha256_algs,
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ARRAY_SIZE(riscv64_sha256_algs));
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return -ENODEV;
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}
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static void __exit riscv64_sha256_mod_exit(void)
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{
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crypto_unregister_shashes(riscv64_sha256_algs,
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ARRAY_SIZE(riscv64_sha256_algs));
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}
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module_init(riscv64_sha256_mod_init);
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module_exit(riscv64_sha256_mod_exit);
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MODULE_DESCRIPTION("SHA-256 (RISC-V accelerated)");
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MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@vrull.eu>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("sha256");
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MODULE_ALIAS_CRYPTO("sha224");
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