1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Glue Code for the AVX assembler implementation of the Cast6 Cipher
4 *
5 * Copyright (C) 2012 Johannes Goetzfried
6 *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
7 *
8 * Copyright �� 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
9 */
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/crypto.h>
14#include <linux/err.h>
15#include <crypto/algapi.h>
16#include <crypto/cast6.h>
17#include <crypto/internal/simd.h>
18
19#include "ecb_cbc_helpers.h"
20
21#define CAST6_PARALLEL_BLOCKS 8
22
23asmlinkage void cast6_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src);
24asmlinkage void cast6_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src);
25
26asmlinkage void cast6_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src);
27
28static int cast6_setkey_skcipher(struct crypto_skcipher *tfm,
29				 const u8 *key, unsigned int keylen)
30{
31	return cast6_setkey(&tfm->base, key, keylen);
32}
33
34static int ecb_encrypt(struct skcipher_request *req)
35{
36	ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
37	ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_enc_8way);
38	ECB_BLOCK(1, __cast6_encrypt);
39	ECB_WALK_END();
40}
41
42static int ecb_decrypt(struct skcipher_request *req)
43{
44	ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
45	ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_dec_8way);
46	ECB_BLOCK(1, __cast6_decrypt);
47	ECB_WALK_END();
48}
49
50static int cbc_encrypt(struct skcipher_request *req)
51{
52	CBC_WALK_START(req, CAST6_BLOCK_SIZE, -1);
53	CBC_ENC_BLOCK(__cast6_encrypt);
54	CBC_WALK_END();
55}
56
57static int cbc_decrypt(struct skcipher_request *req)
58{
59	CBC_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
60	CBC_DEC_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_cbc_dec_8way);
61	CBC_DEC_BLOCK(1, __cast6_decrypt);
62	CBC_WALK_END();
63}
64
65static struct skcipher_alg cast6_algs[] = {
66	{
67		.base.cra_name		= "__ecb(cast6)",
68		.base.cra_driver_name	= "__ecb-cast6-avx",
69		.base.cra_priority	= 200,
70		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
71		.base.cra_blocksize	= CAST6_BLOCK_SIZE,
72		.base.cra_ctxsize	= sizeof(struct cast6_ctx),
73		.base.cra_module	= THIS_MODULE,
74		.min_keysize		= CAST6_MIN_KEY_SIZE,
75		.max_keysize		= CAST6_MAX_KEY_SIZE,
76		.setkey			= cast6_setkey_skcipher,
77		.encrypt		= ecb_encrypt,
78		.decrypt		= ecb_decrypt,
79	}, {
80		.base.cra_name		= "__cbc(cast6)",
81		.base.cra_driver_name	= "__cbc-cast6-avx",
82		.base.cra_priority	= 200,
83		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
84		.base.cra_blocksize	= CAST6_BLOCK_SIZE,
85		.base.cra_ctxsize	= sizeof(struct cast6_ctx),
86		.base.cra_module	= THIS_MODULE,
87		.min_keysize		= CAST6_MIN_KEY_SIZE,
88		.max_keysize		= CAST6_MAX_KEY_SIZE,
89		.ivsize			= CAST6_BLOCK_SIZE,
90		.setkey			= cast6_setkey_skcipher,
91		.encrypt		= cbc_encrypt,
92		.decrypt		= cbc_decrypt,
93	},
94};
95
96static struct simd_skcipher_alg *cast6_simd_algs[ARRAY_SIZE(cast6_algs)];
97
98static int __init cast6_init(void)
99{
100	const char *feature_name;
101
102	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
103				&feature_name)) {
104		pr_info("CPU feature '%s' is not supported.\n", feature_name);
105		return -ENODEV;
106	}
107
108	return simd_register_skciphers_compat(cast6_algs,
109					      ARRAY_SIZE(cast6_algs),
110					      cast6_simd_algs);
111}
112
113static void __exit cast6_exit(void)
114{
115	simd_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs),
116				  cast6_simd_algs);
117}
118
119module_init(cast6_init);
120module_exit(cast6_exit);
121
122MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
123MODULE_LICENSE("GPL");
124MODULE_ALIAS_CRYPTO("cast6");
125