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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/crypto/cast5_avx_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 the AVX assembler implementation of the Cast5 Cipher

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 *

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 * Copyright (C) 2012 Johannes Goetzfried

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 *     <[email protected]>

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 */

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#include <crypto/algapi.h>

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#include <crypto/cast5.h>

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#include <linux/crypto.h>

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#include <linux/err.h>

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#include <linux/module.h>

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#include <linux/types.h>

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#include "ecb_cbc_helpers.h"

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#define CAST5_PARALLEL_BLOCKS 16

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asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,

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				    const u8 *src);

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asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,

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				    const u8 *src);

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asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,

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				    const u8 *src);

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static int cast5_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,

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				 unsigned int keylen)

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{

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	return cast5_setkey(&tfm->base, key, keylen);

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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, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);

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	ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_enc_16way);

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	ECB_BLOCK(1, __cast5_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, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);

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	ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_dec_16way);

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	ECB_BLOCK(1, __cast5_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, CAST5_BLOCK_SIZE, -1);

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	CBC_ENC_BLOCK(__cast5_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, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);

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	CBC_DEC_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_cbc_dec_16way);

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	CBC_DEC_BLOCK(1, __cast5_decrypt);

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	CBC_WALK_END();

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}

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static struct skcipher_alg cast5_algs[] = {

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	{

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		.base.cra_name		= "ecb(cast5)",

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		.base.cra_driver_name	= "ecb-cast5-avx",

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		.base.cra_priority	= 200,

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		.base.cra_blocksize	= CAST5_BLOCK_SIZE,

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		.base.cra_ctxsize	= sizeof(struct cast5_ctx),

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		.base.cra_module	= THIS_MODULE,

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		.min_keysize		= CAST5_MIN_KEY_SIZE,

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		.max_keysize		= CAST5_MAX_KEY_SIZE,

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		.setkey			= cast5_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(cast5)",

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		.base.cra_driver_name	= "cbc-cast5-avx",

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		.base.cra_priority	= 200,

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		.base.cra_blocksize	= CAST5_BLOCK_SIZE,

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		.base.cra_ctxsize	= sizeof(struct cast5_ctx),

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		.base.cra_module	= THIS_MODULE,

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		.min_keysize		= CAST5_MIN_KEY_SIZE,

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		.max_keysize		= CAST5_MAX_KEY_SIZE,

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		.ivsize			= CAST5_BLOCK_SIZE,

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		.setkey			= cast5_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 cast5_init(void)

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{

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	const char *feature_name;

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	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,

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				&feature_name)) {

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		pr_info("CPU feature '%s' is not supported.\n", feature_name);

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		return -ENODEV;

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	}

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	return crypto_register_skciphers(cast5_algs,

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					 ARRAY_SIZE(cast5_algs));

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}

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static void __exit cast5_exit(void)

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{

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	crypto_unregister_skciphers(cast5_algs, ARRAY_SIZE(cast5_algs));

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}

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module_init(cast5_init);

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module_exit(cast5_exit);

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MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");

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MODULE_LICENSE("GPL");

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MODULE_ALIAS_CRYPTO("cast5");

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