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- // SPDX-License-Identifier: GPL-2.0
- /*
- * SM4 Cipher Algorithm.
- *
- * Copyright (C) 2018 ARM Limited or its affiliates.
- * All rights reserved.
- */
- #include <crypto/sm4.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/types.h>
- #include <linux/errno.h>
- #include <linux/crypto.h>
- #include <asm/byteorder.h>
- #include <asm/unaligned.h>
- /**
- * sm4_setkey - Set the SM4 key.
- * @tfm: The %crypto_tfm that is used in the context.
- * @in_key: The input key.
- * @key_len: The size of the key.
- *
- * This function uses sm4_expandkey() to expand the key.
- * &sm4_ctx _must_ be the private data embedded in @tfm which is
- * retrieved with crypto_tfm_ctx().
- *
- * Return: 0 on success; -EINVAL on failure (only happens for bad key lengths)
- */
- static int sm4_setkey(struct crypto_tfm *tfm, const u8 *in_key,
- unsigned int key_len)
- {
- struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
- return sm4_expandkey(ctx, in_key, key_len);
- }
- /* encrypt a block of text */
- static void sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
- {
- const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
- sm4_crypt_block(ctx->rkey_enc, out, in);
- }
- /* decrypt a block of text */
- static void sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
- {
- const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
- sm4_crypt_block(ctx->rkey_dec, out, in);
- }
- static struct crypto_alg sm4_alg = {
- .cra_name = "sm4",
- .cra_driver_name = "sm4-generic",
- .cra_priority = 100,
- .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
- .cra_blocksize = SM4_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct sm4_ctx),
- .cra_module = THIS_MODULE,
- .cra_u = {
- .cipher = {
- .cia_min_keysize = SM4_KEY_SIZE,
- .cia_max_keysize = SM4_KEY_SIZE,
- .cia_setkey = sm4_setkey,
- .cia_encrypt = sm4_encrypt,
- .cia_decrypt = sm4_decrypt
- }
- }
- };
- static int __init sm4_init(void)
- {
- return crypto_register_alg(&sm4_alg);
- }
- static void __exit sm4_fini(void)
- {
- crypto_unregister_alg(&sm4_alg);
- }
- subsys_initcall(sm4_init);
- module_exit(sm4_fini);
- MODULE_DESCRIPTION("SM4 Cipher Algorithm");
- MODULE_LICENSE("GPL v2");
- MODULE_ALIAS_CRYPTO("sm4");
- MODULE_ALIAS_CRYPTO("sm4-generic");
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