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92 lines
2.1 KiB
92 lines
2.1 KiB
// 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/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 <linux/crypto.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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