cast5_avx_glue.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Glue Code for the AVX assembler implementation of the Cast5 Cipher
  4 *
  5 * Copyright (C) 2012 Johannes Goetzfried
  6 *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
  7 */
  8
  9#include <crypto/algapi.h>
 10#include <crypto/cast5.h>
 11#include <linux/crypto.h>
 12#include <linux/err.h>
 13#include <linux/module.h>
 14#include <linux/types.h>
 15
 16#include "ecb_cbc_helpers.h"
 17
 18#define CAST5_PARALLEL_BLOCKS 16
 19
 20asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,
 21				    const u8 *src);
 22asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,
 23				    const u8 *src);
 24asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,
 25				    const u8 *src);
 26
 27static int cast5_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
 28				 unsigned int keylen)
 29{
 30	return cast5_setkey(&tfm->base, key, keylen);
 31}
 32
 33static int ecb_encrypt(struct skcipher_request *req)
 34{
 35	ECB_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);
 36	ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_enc_16way);
 37	ECB_BLOCK(1, __cast5_encrypt);
 38	ECB_WALK_END();
 39}
 40
 41static int ecb_decrypt(struct skcipher_request *req)
 42{
 43	ECB_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);
 44	ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_dec_16way);
 45	ECB_BLOCK(1, __cast5_decrypt);
 46	ECB_WALK_END();
 47}
 48
 49static int cbc_encrypt(struct skcipher_request *req)
 50{
 51	CBC_WALK_START(req, CAST5_BLOCK_SIZE, -1);
 52	CBC_ENC_BLOCK(__cast5_encrypt);
 53	CBC_WALK_END();
 54}
 55
 56static int cbc_decrypt(struct skcipher_request *req)
 57{
 58	CBC_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);
 59	CBC_DEC_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_cbc_dec_16way);
 60	CBC_DEC_BLOCK(1, __cast5_decrypt);
 61	CBC_WALK_END();
 62}
 63
 64static struct skcipher_alg cast5_algs[] = {
 65	{
 66		.base.cra_name		= "ecb(cast5)",
 67		.base.cra_driver_name	= "ecb-cast5-avx",
 68		.base.cra_priority	= 200,
 69		.base.cra_blocksize	= CAST5_BLOCK_SIZE,
 70		.base.cra_ctxsize	= sizeof(struct cast5_ctx),
 71		.base.cra_module	= THIS_MODULE,
 72		.min_keysize		= CAST5_MIN_KEY_SIZE,
 73		.max_keysize		= CAST5_MAX_KEY_SIZE,
 74		.setkey			= cast5_setkey_skcipher,
 75		.encrypt		= ecb_encrypt,
 76		.decrypt		= ecb_decrypt,
 77	}, {
 78		.base.cra_name		= "cbc(cast5)",
 79		.base.cra_driver_name	= "cbc-cast5-avx",
 80		.base.cra_priority	= 200,
 81		.base.cra_blocksize	= CAST5_BLOCK_SIZE,
 82		.base.cra_ctxsize	= sizeof(struct cast5_ctx),
 83		.base.cra_module	= THIS_MODULE,
 84		.min_keysize		= CAST5_MIN_KEY_SIZE,
 85		.max_keysize		= CAST5_MAX_KEY_SIZE,
 86		.ivsize			= CAST5_BLOCK_SIZE,
 87		.setkey			= cast5_setkey_skcipher,
 88		.encrypt		= cbc_encrypt,
 89		.decrypt		= cbc_decrypt,
 90	}
 91};
 92
 93static int __init cast5_init(void)
 94{
 95	const char *feature_name;
 96
 97	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
 98				&feature_name)) {
 99		pr_info("CPU feature '%s' is not supported.\n", feature_name);
100		return -ENODEV;
101	}
102
103	return crypto_register_skciphers(cast5_algs,
104					 ARRAY_SIZE(cast5_algs));
105}
106
107static void __exit cast5_exit(void)
108{
109	crypto_unregister_skciphers(cast5_algs, ARRAY_SIZE(cast5_algs));
110}
111
112module_init(cast5_init);
113module_exit(cast5_exit);
114
115MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
116MODULE_LICENSE("GPL");
117MODULE_ALIAS_CRYPTO("cast5");