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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SM3 using the RISC-V vector crypto extensions
*
* Copyright (C) 2023 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/hash.h>
#include <crypto/internal/simd.h>
#include <crypto/sm3_base.h>
#include <linux/linkage.h>
#include <linux/module.h>
/*
* Note: the asm function only uses the 'state' field of struct sm3_state.
* It is assumed to be the first field.
*/
asmlinkage void sm3_transform_zvksh_zvkb(
struct sm3_state *state, const u8 *data, int num_blocks);
static int riscv64_sm3_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
/*
* Ensure struct sm3_state begins directly with the SM3
* 256-bit internal state, as this is what the asm function expects.
*/
BUILD_BUG_ON(offsetof(struct sm3_state, state) != 0);
if (crypto_simd_usable()) {
kernel_vector_begin();
sm3_base_do_update(desc, data, len, sm3_transform_zvksh_zvkb);
kernel_vector_end();
} else {
sm3_update(shash_desc_ctx(desc), data, len);
}
return 0;
}
static int riscv64_sm3_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out)
{
struct sm3_state *ctx;
if (crypto_simd_usable()) {
kernel_vector_begin();
if (len)
sm3_base_do_update(desc, data, len,
sm3_transform_zvksh_zvkb);
sm3_base_do_finalize(desc, sm3_transform_zvksh_zvkb);
kernel_vector_end();
return sm3_base_finish(desc, out);
}
ctx = shash_desc_ctx(desc);
if (len)
sm3_update(ctx, data, len);
sm3_final(ctx, out);
return 0;
}
static int riscv64_sm3_final(struct shash_desc *desc, u8 *out)
{
return riscv64_sm3_finup(desc, NULL, 0, out);
}
static struct shash_alg riscv64_sm3_alg = {
.init = sm3_base_init,
.update = riscv64_sm3_update,
.final = riscv64_sm3_final,
.finup = riscv64_sm3_finup,
.descsize = sizeof(struct sm3_state),
.digestsize = SM3_DIGEST_SIZE,
.base = {
.cra_blocksize = SM3_BLOCK_SIZE,
.cra_priority = 300,
.cra_name = "sm3",
.cra_driver_name = "sm3-riscv64-zvksh-zvkb",
.cra_module = THIS_MODULE,
},
};
static int __init riscv64_sm3_mod_init(void)
{
if (riscv_isa_extension_available(NULL, ZVKSH) &&
riscv_isa_extension_available(NULL, ZVKB) &&
riscv_vector_vlen() >= 128)
return crypto_register_shash(&riscv64_sm3_alg);
return -ENODEV;
}
static void __exit riscv64_sm3_mod_exit(void)
{
crypto_unregister_shash(&riscv64_sm3_alg);
}
module_init(riscv64_sm3_mod_init);
module_exit(riscv64_sm3_mod_exit);
MODULE_DESCRIPTION("SM3 (RISC-V accelerated)");
MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@vrull.eu>");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("sm3");
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