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// SPDX-License-Identifier: GPL-2.0-only
/*
* SM4 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/cipher.h>
#include <crypto/internal/simd.h>
#include <crypto/sm4.h>
#include <linux/linkage.h>
#include <linux/module.h>
asmlinkage void sm4_expandkey_zvksed_zvkb(const u8 user_key[SM4_KEY_SIZE],
u32 rkey_enc[SM4_RKEY_WORDS],
u32 rkey_dec[SM4_RKEY_WORDS]);
asmlinkage void sm4_crypt_zvksed_zvkb(const u32 rkey[SM4_RKEY_WORDS],
const u8 in[SM4_BLOCK_SIZE],
u8 out[SM4_BLOCK_SIZE]);
static int riscv64_sm4_setkey(struct crypto_tfm *tfm, const u8 *key,
unsigned int keylen)
{
struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
if (crypto_simd_usable()) {
if (keylen != SM4_KEY_SIZE)
return -EINVAL;
kernel_vector_begin();
sm4_expandkey_zvksed_zvkb(key, ctx->rkey_enc, ctx->rkey_dec);
kernel_vector_end();
return 0;
}
return sm4_expandkey(ctx, key, keylen);
}
static void riscv64_sm4_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
if (crypto_simd_usable()) {
kernel_vector_begin();
sm4_crypt_zvksed_zvkb(ctx->rkey_enc, src, dst);
kernel_vector_end();
} else {
sm4_crypt_block(ctx->rkey_enc, dst, src);
}
}
static void riscv64_sm4_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
if (crypto_simd_usable()) {
kernel_vector_begin();
sm4_crypt_zvksed_zvkb(ctx->rkey_dec, src, dst);
kernel_vector_end();
} else {
sm4_crypt_block(ctx->rkey_dec, dst, src);
}
}
static struct crypto_alg riscv64_sm4_alg = {
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = SM4_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct sm4_ctx),
.cra_priority = 300,
.cra_name = "sm4",
.cra_driver_name = "sm4-riscv64-zvksed-zvkb",
.cra_cipher = {
.cia_min_keysize = SM4_KEY_SIZE,
.cia_max_keysize = SM4_KEY_SIZE,
.cia_setkey = riscv64_sm4_setkey,
.cia_encrypt = riscv64_sm4_encrypt,
.cia_decrypt = riscv64_sm4_decrypt,
},
.cra_module = THIS_MODULE,
};
static int __init riscv64_sm4_mod_init(void)
{
if (riscv_isa_extension_available(NULL, ZVKSED) &&
riscv_isa_extension_available(NULL, ZVKB) &&
riscv_vector_vlen() >= 128)
return crypto_register_alg(&riscv64_sm4_alg);
return -ENODEV;
}
static void __exit riscv64_sm4_mod_exit(void)
{
crypto_unregister_alg(&riscv64_sm4_alg);
}
module_init(riscv64_sm4_mod_init);
module_exit(riscv64_sm4_mod_exit);
MODULE_DESCRIPTION("SM4 (RISC-V accelerated)");
MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@vrull.eu>");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("sm4");
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