108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* SM4 using the RISC-V vector crypto extensions
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*
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* Copyright (C) 2023 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/cipher.h>
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#include <crypto/internal/simd.h>
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#include <crypto/sm4.h>
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#include <linux/linkage.h>
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#include <linux/module.h>
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asmlinkage void sm4_expandkey_zvksed_zvkb(const u8 user_key[SM4_KEY_SIZE],
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u32 rkey_enc[SM4_RKEY_WORDS],
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u32 rkey_dec[SM4_RKEY_WORDS]);
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asmlinkage void sm4_crypt_zvksed_zvkb(const u32 rkey[SM4_RKEY_WORDS],
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const u8 in[SM4_BLOCK_SIZE],
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u8 out[SM4_BLOCK_SIZE]);
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static int riscv64_sm4_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
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if (crypto_simd_usable()) {
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if (keylen != SM4_KEY_SIZE)
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return -EINVAL;
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kernel_vector_begin();
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sm4_expandkey_zvksed_zvkb(key, ctx->rkey_enc, ctx->rkey_dec);
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kernel_vector_end();
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return 0;
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}
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return sm4_expandkey(ctx, key, keylen);
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}
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static void riscv64_sm4_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
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if (crypto_simd_usable()) {
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kernel_vector_begin();
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sm4_crypt_zvksed_zvkb(ctx->rkey_enc, src, dst);
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kernel_vector_end();
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} else {
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sm4_crypt_block(ctx->rkey_enc, dst, src);
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}
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}
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static void riscv64_sm4_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
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if (crypto_simd_usable()) {
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kernel_vector_begin();
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sm4_crypt_zvksed_zvkb(ctx->rkey_dec, src, dst);
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kernel_vector_end();
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} else {
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sm4_crypt_block(ctx->rkey_dec, dst, src);
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}
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}
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static struct crypto_alg riscv64_sm4_alg = {
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = SM4_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct sm4_ctx),
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.cra_priority = 300,
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.cra_name = "sm4",
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.cra_driver_name = "sm4-riscv64-zvksed-zvkb",
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.cra_cipher = {
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.cia_min_keysize = SM4_KEY_SIZE,
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.cia_max_keysize = SM4_KEY_SIZE,
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.cia_setkey = riscv64_sm4_setkey,
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.cia_encrypt = riscv64_sm4_encrypt,
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.cia_decrypt = riscv64_sm4_decrypt,
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},
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.cra_module = THIS_MODULE,
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};
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static int __init riscv64_sm4_mod_init(void)
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{
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if (riscv_isa_extension_available(NULL, ZVKSED) &&
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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_alg(&riscv64_sm4_alg);
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return -ENODEV;
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}
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static void __exit riscv64_sm4_mod_exit(void)
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{
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crypto_unregister_alg(&riscv64_sm4_alg);
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}
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module_init(riscv64_sm4_mod_init);
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module_exit(riscv64_sm4_mod_exit);
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MODULE_DESCRIPTION("SM4 (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("sm4");
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