summaryrefslogtreecommitdiffstats
path: root/arch/x86/crypto/serpent_avx2_glue.c
blob: ccf0b5fa4933066c054c2269a40cbbf6b9d3a08a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Glue Code for x86_64/AVX2 assembler optimized version of Serpent
 *
 * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <crypto/algapi.h>
#include <crypto/internal/simd.h>
#include <crypto/serpent.h>

#include "serpent-avx.h"
#include "ecb_cbc_helpers.h"

#define SERPENT_AVX2_PARALLEL_BLOCKS 16

/* 16-way AVX2 parallel cipher functions */
asmlinkage void serpent_ecb_enc_16way(const void *ctx, u8 *dst, const u8 *src);
asmlinkage void serpent_ecb_dec_16way(const void *ctx, u8 *dst, const u8 *src);
asmlinkage void serpent_cbc_dec_16way(const void *ctx, u8 *dst, const u8 *src);

static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
				   const u8 *key, unsigned int keylen)
{
	return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
}

static int ecb_encrypt(struct skcipher_request *req)
{
	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
	ECB_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_ecb_enc_16way);
	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_enc_8way_avx);
	ECB_BLOCK(1, __serpent_encrypt);
	ECB_WALK_END();
}

static int ecb_decrypt(struct skcipher_request *req)
{
	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
	ECB_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_ecb_dec_16way);
	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_dec_8way_avx);
	ECB_BLOCK(1, __serpent_decrypt);
	ECB_WALK_END();
}

static int cbc_encrypt(struct skcipher_request *req)
{
	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
	CBC_ENC_BLOCK(__serpent_encrypt);
	CBC_WALK_END();
}

static int cbc_decrypt(struct skcipher_request *req)
{
	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
	CBC_DEC_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_cbc_dec_16way);
	CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_cbc_dec_8way_avx);
	CBC_DEC_BLOCK(1, __serpent_decrypt);
	CBC_WALK_END();
}

static struct skcipher_alg serpent_algs[] = {
	{
		.base.cra_name		= "__ecb(serpent)",
		.base.cra_driver_name	= "__ecb-serpent-avx2",
		.base.cra_priority	= 600,
		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
		.base.cra_module	= THIS_MODULE,
		.min_keysize		= SERPENT_MIN_KEY_SIZE,
		.max_keysize		= SERPENT_MAX_KEY_SIZE,
		.setkey			= serpent_setkey_skcipher,
		.encrypt		= ecb_encrypt,
		.decrypt		= ecb_decrypt,
	}, {
		.base.cra_name		= "__cbc(serpent)",
		.base.cra_driver_name	= "__cbc-serpent-avx2",
		.base.cra_priority	= 600,
		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
		.base.cra_module	= THIS_MODULE,
		.min_keysize		= SERPENT_MIN_KEY_SIZE,
		.max_keysize		= SERPENT_MAX_KEY_SIZE,
		.ivsize			= SERPENT_BLOCK_SIZE,
		.setkey			= serpent_setkey_skcipher,
		.encrypt		= cbc_encrypt,
		.decrypt		= cbc_decrypt,
	},
};

static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];

static int __init init(void)
{
	const char *feature_name;

	if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
		pr_info("AVX2 instructions are not detected.\n");
		return -ENODEV;
	}
	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
				&feature_name)) {
		pr_info("CPU feature '%s' is not supported.\n", feature_name);
		return -ENODEV;
	}

	return simd_register_skciphers_compat(serpent_algs,
					      ARRAY_SIZE(serpent_algs),
					      serpent_simd_algs);
}

static void __exit fini(void)
{
	simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
				  serpent_simd_algs);
}

module_init(init);
module_exit(fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized");
MODULE_ALIAS_CRYPTO("serpent");
MODULE_ALIAS_CRYPTO("serpent-asm");