// SPDX-License-Identifier: GPL-2.0 /* * SM4 Cipher Algorithm. * * Copyright (C) 2018 ARM Limited or its affiliates. * All rights reserved. */ #include <crypto/algapi.h> #include <crypto/sm4.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/errno.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");