1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Glue Code for AVX assembler versions of Serpent Cipher
4 *
5 * Copyright (C) 2012 Johannes Goetzfried
6 *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
7 *
8 * Copyright © 2011-2013 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/internal/simd.h>
17#include <crypto/serpent.h>
18
19#include "serpent-avx.h"
20#include "ecb_cbc_helpers.h"
21
22/* 8-way parallel cipher functions */
23asmlinkage void serpent_ecb_enc_8way_avx(const void *ctx, u8 *dst,
24					 const u8 *src);
25EXPORT_SYMBOL_GPL(serpent_ecb_enc_8way_avx);
26
27asmlinkage void serpent_ecb_dec_8way_avx(const void *ctx, u8 *dst,
28					 const u8 *src);
29EXPORT_SYMBOL_GPL(serpent_ecb_dec_8way_avx);
30
31asmlinkage void serpent_cbc_dec_8way_avx(const void *ctx, u8 *dst,
32					 const u8 *src);
33EXPORT_SYMBOL_GPL(serpent_cbc_dec_8way_avx);
34
35static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
36				   const u8 *key, unsigned int keylen)
37{
38	return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
39}
40
41static int ecb_encrypt(struct skcipher_request *req)
42{
43	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
44	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_enc_8way_avx);
45	ECB_BLOCK(1, __serpent_encrypt);
46	ECB_WALK_END();
47}
48
49static int ecb_decrypt(struct skcipher_request *req)
50{
51	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
52	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_dec_8way_avx);
53	ECB_BLOCK(1, __serpent_decrypt);
54	ECB_WALK_END();
55}
56
57static int cbc_encrypt(struct skcipher_request *req)
58{
59	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
60	CBC_ENC_BLOCK(__serpent_encrypt);
61	CBC_WALK_END();
62}
63
64static int cbc_decrypt(struct skcipher_request *req)
65{
66	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
67	CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_cbc_dec_8way_avx);
68	CBC_DEC_BLOCK(1, __serpent_decrypt);
69	CBC_WALK_END();
70}
71
72static struct skcipher_alg serpent_algs[] = {
73	{
74		.base.cra_name		= "__ecb(serpent)",
75		.base.cra_driver_name	= "__ecb-serpent-avx",
76		.base.cra_priority	= 500,
77		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
78		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
79		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
80		.base.cra_module	= THIS_MODULE,
81		.min_keysize		= SERPENT_MIN_KEY_SIZE,
82		.max_keysize		= SERPENT_MAX_KEY_SIZE,
83		.setkey			= serpent_setkey_skcipher,
84		.encrypt		= ecb_encrypt,
85		.decrypt		= ecb_decrypt,
86	}, {
87		.base.cra_name		= "__cbc(serpent)",
88		.base.cra_driver_name	= "__cbc-serpent-avx",
89		.base.cra_priority	= 500,
90		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
91		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
92		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
93		.base.cra_module	= THIS_MODULE,
94		.min_keysize		= SERPENT_MIN_KEY_SIZE,
95		.max_keysize		= SERPENT_MAX_KEY_SIZE,
96		.ivsize			= SERPENT_BLOCK_SIZE,
97		.setkey			= serpent_setkey_skcipher,
98		.encrypt		= cbc_encrypt,
99		.decrypt		= cbc_decrypt,
100	},
101};
102
103static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
104
105static int __init serpent_init(void)
106{
107	const char *feature_name;
108
109	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
110				&feature_name)) {
111		pr_info("CPU feature '%s' is not supported.\n", feature_name);
112		return -ENODEV;
113	}
114
115	return simd_register_skciphers_compat(serpent_algs,
116					      ARRAY_SIZE(serpent_algs),
117					      serpent_simd_algs);
118}
119
120static void __exit serpent_exit(void)
121{
122	simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
123				  serpent_simd_algs);
124}
125
126module_init(serpent_init);
127module_exit(serpent_exit);
128
129MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX optimized");
130MODULE_LICENSE("GPL");
131MODULE_ALIAS_CRYPTO("serpent");
132