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