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2b31277af5
Take the existing small footprint and mostly time invariant C code and turn it into a SM4 library that can be used for non-performance critical, casual use of SM4, and as a fallback for, e.g., SIMD code that needs a secondary path that can be taken in contexts where the SIMD unit is off limits. Secondly, some codes have been optimized, such as unrolling small times loop, removing unnecessary memory shifts, exporting sbox, fk, ck arrays, and basic encryption and decryption functions. Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
// 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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* crypto_sm4_set_key - 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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* &crypto_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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int crypto_sm4_set_key(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 crypto_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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EXPORT_SYMBOL_GPL(crypto_sm4_set_key);
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/* encrypt a block of text */
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void crypto_sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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const struct crypto_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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EXPORT_SYMBOL_GPL(crypto_sm4_encrypt);
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/* decrypt a block of text */
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void crypto_sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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const struct crypto_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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EXPORT_SYMBOL_GPL(crypto_sm4_decrypt);
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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 crypto_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 = crypto_sm4_set_key,
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.cia_encrypt = crypto_sm4_encrypt,
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.cia_decrypt = crypto_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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