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crypto: riscv/sha256 - implement library instead of shash

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Instead of providing crypto_shash algorithms for the arch-optimized
SHA-256 code, instead implement the SHA-256 library.  This is much
simpler, it makes the SHA-256 library functions be arch-optimized, and
it fixes the longstanding issue where the arch-optimized SHA-256 was
disabled by default.  SHA-256 still remains available through
crypto_shash, but individual architectures no longer need to handle it.

To match sha256_blocks_arch(), change the type of the nblocks parameter
of the assembly function from int to size_t.  The assembly function
actually already treated it as size_t.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers
2025-04-28 10:00:32 -07:00
committed by Herbert Xu
parent 1a49c573bf
commit bf52d93865
7 changed files with 74 additions and 141 deletions
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62
arch/riscv/lib/crypto/sha256.c Normal file
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SHA-256 (RISC-V accelerated)
*
* Copyright (C) 2022 VRULL GmbH
* Author: Heiko Stuebner <heiko.stuebner@vrull.eu>
*
* Copyright (C) 2023 SiFive, Inc.
* Author: Jerry Shih <jerry.shih@sifive.com>
*/
#include <asm/simd.h>
#include <asm/vector.h>
#include <crypto/internal/sha2.h>
#include <crypto/internal/simd.h>
#include <linux/kernel.h>
#include <linux/module.h>
asmlinkage void sha256_transform_zvknha_or_zvknhb_zvkb(
u32 state[SHA256_STATE_WORDS], const u8 *data, size_t nblocks);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_extensions);
void sha256_blocks_arch(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks)
{
if (static_branch_likely(&have_extensions) && crypto_simd_usable()) {
kernel_vector_begin();
sha256_transform_zvknha_or_zvknhb_zvkb(state, data, nblocks);
kernel_vector_end();
} else {
sha256_blocks_generic(state, data, nblocks);
}
}
EXPORT_SYMBOL(sha256_blocks_arch);
bool sha256_is_arch_optimized(void)
{
return static_key_enabled(&have_extensions);
}
EXPORT_SYMBOL(sha256_is_arch_optimized);
static int __init riscv64_sha256_mod_init(void)
{
/* Both zvknha and zvknhb provide the SHA-256 instructions. */
if ((riscv_isa_extension_available(NULL, ZVKNHA) ||
riscv_isa_extension_available(NULL, ZVKNHB)) &&
riscv_isa_extension_available(NULL, ZVKB) &&
riscv_vector_vlen() >= 128)
static_branch_enable(&have_extensions);
return 0;
}
arch_initcall(riscv64_sha256_mod_init);
static void __exit riscv64_sha256_mod_exit(void)
{
}
module_exit(riscv64_sha256_mod_exit);
MODULE_DESCRIPTION("SHA-256 (RISC-V accelerated)");
MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@vrull.eu>");
MODULE_LICENSE("GPL");