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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/crypto/serpent_sse2_glue.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/*

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 * Glue Code for SSE2 assembler versions of Serpent Cipher

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 *

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 * Copyright (c) 2011 Jussi Kivilinna <[email protected]>

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 *

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 * Glue code based on aesni-intel_glue.c by:

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 *  Copyright (C) 2008, Intel Corp.

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 *    Author: Huang Ying <[email protected]>

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 *

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 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:

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 *   Copyright (c) 2006 Herbert Xu <[email protected]>

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 */

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#include <linux/module.h>

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#include <linux/types.h>

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#include <linux/crypto.h>

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#include <linux/err.h>

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#include <crypto/algapi.h>

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#include <crypto/b128ops.h>

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#include <crypto/serpent.h>

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#include "serpent-sse2.h"

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#include "ecb_cbc_helpers.h"

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static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,

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				   const u8 *key, unsigned int keylen)

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{

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	return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);

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}

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static void serpent_decrypt_cbc_xway(const void *ctx, u8 *dst, const u8 *src)

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{

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	u8 buf[SERPENT_PARALLEL_BLOCKS - 1][SERPENT_BLOCK_SIZE];

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	const u8 *s = src;

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	if (dst == src)

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		s = memcpy(buf, src, sizeof(buf));

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	serpent_dec_blk_xway(ctx, dst, src);

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	crypto_xor(dst + SERPENT_BLOCK_SIZE, s, sizeof(buf));

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}

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static int ecb_encrypt(struct skcipher_request *req)

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{

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	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);

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	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_enc_blk_xway);

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	ECB_BLOCK(1, __serpent_encrypt);

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	ECB_WALK_END();

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}

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static int ecb_decrypt(struct skcipher_request *req)

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{

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	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);

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	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_dec_blk_xway);

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	ECB_BLOCK(1, __serpent_decrypt);

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	ECB_WALK_END();

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}

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static int cbc_encrypt(struct skcipher_request *req)

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{

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	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);

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	CBC_ENC_BLOCK(__serpent_encrypt);

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	CBC_WALK_END();

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}

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static int cbc_decrypt(struct skcipher_request *req)

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{

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	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);

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	CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_decrypt_cbc_xway);

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	CBC_DEC_BLOCK(1, __serpent_decrypt);

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	CBC_WALK_END();

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}

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static struct skcipher_alg serpent_algs[] = {

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	{

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		.base.cra_name		= "ecb(serpent)",

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		.base.cra_driver_name	= "ecb-serpent-sse2",

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		.base.cra_priority	= 400,

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		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,

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		.base.cra_ctxsize	= sizeof(struct serpent_ctx),

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		.base.cra_module	= THIS_MODULE,

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		.min_keysize		= SERPENT_MIN_KEY_SIZE,

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		.max_keysize		= SERPENT_MAX_KEY_SIZE,

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		.setkey			= serpent_setkey_skcipher,

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		.encrypt		= ecb_encrypt,

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		.decrypt		= ecb_decrypt,

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	}, {

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		.base.cra_name		= "cbc(serpent)",

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		.base.cra_driver_name	= "cbc-serpent-sse2",

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		.base.cra_priority	= 400,

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		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,

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		.base.cra_ctxsize	= sizeof(struct serpent_ctx),

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		.base.cra_module	= THIS_MODULE,

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		.min_keysize		= SERPENT_MIN_KEY_SIZE,

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		.max_keysize		= SERPENT_MAX_KEY_SIZE,

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		.ivsize			= SERPENT_BLOCK_SIZE,

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		.setkey			= serpent_setkey_skcipher,

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		.encrypt		= cbc_encrypt,

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		.decrypt		= cbc_decrypt,

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	},

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};

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static int __init serpent_sse2_init(void)

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{

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	if (!boot_cpu_has(X86_FEATURE_XMM2)) {

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		printk(KERN_INFO "SSE2 instructions are not detected.\n");

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		return -ENODEV;

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	}

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	return crypto_register_skciphers(serpent_algs,

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					 ARRAY_SIZE(serpent_algs));

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}

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static void __exit serpent_sse2_exit(void)

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{

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	crypto_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs));

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}

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module_init(serpent_sse2_init);

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module_exit(serpent_sse2_exit);

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MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");

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MODULE_LICENSE("GPL");

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MODULE_ALIAS_CRYPTO("serpent");

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