1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Glue Code for x86_64/AVX2 assembler optimized version of Serpent
4 *
5 * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
6 */
7
8#include <linux/module.h>
9#include <linux/types.h>
10#include <linux/crypto.h>
11#include <linux/err.h>
12#include <crypto/algapi.h>
13#include <crypto/internal/simd.h>
14#include <crypto/serpent.h>
15
16#include "serpent-avx.h"
17#include "ecb_cbc_helpers.h"
18
19#define SERPENT_AVX2_PARALLEL_BLOCKS 16
20
21/* 16-way AVX2 parallel cipher functions */
22asmlinkage void serpent_ecb_enc_16way(const void *ctx, u8 *dst, const u8 *src);
23asmlinkage void serpent_ecb_dec_16way(const void *ctx, u8 *dst, const u8 *src);
24asmlinkage void serpent_cbc_dec_16way(const void *ctx, u8 *dst, const u8 *src);
25
26static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
27				   const u8 *key, unsigned int keylen)
28{
29	return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
30}
31
32static int ecb_encrypt(struct skcipher_request *req)
33{
34	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
35	ECB_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_ecb_enc_16way);
36	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_enc_8way_avx);
37	ECB_BLOCK(1, __serpent_encrypt);
38	ECB_WALK_END();
39}
40
41static int ecb_decrypt(struct skcipher_request *req)
42{
43	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
44	ECB_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_ecb_dec_16way);
45	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_dec_8way_avx);
46	ECB_BLOCK(1, __serpent_decrypt);
47	ECB_WALK_END();
48}
49
50static int cbc_encrypt(struct skcipher_request *req)
51{
52	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
53	CBC_ENC_BLOCK(__serpent_encrypt);
54	CBC_WALK_END();
55}
56
57static int cbc_decrypt(struct skcipher_request *req)
58{
59	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
60	CBC_DEC_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_cbc_dec_16way);
61	CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_cbc_dec_8way_avx);
62	CBC_DEC_BLOCK(1, __serpent_decrypt);
63	CBC_WALK_END();
64}
65
66static struct skcipher_alg serpent_algs[] = {
67	{
68		.base.cra_name		= "__ecb(serpent)",
69		.base.cra_driver_name	= "__ecb-serpent-avx2",
70		.base.cra_priority	= 600,
71		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
72		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
73		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
74		.base.cra_module	= THIS_MODULE,
75		.min_keysize		= SERPENT_MIN_KEY_SIZE,
76		.max_keysize		= SERPENT_MAX_KEY_SIZE,
77		.setkey			= serpent_setkey_skcipher,
78		.encrypt		= ecb_encrypt,
79		.decrypt		= ecb_decrypt,
80	}, {
81		.base.cra_name		= "__cbc(serpent)",
82		.base.cra_driver_name	= "__cbc-serpent-avx2",
83		.base.cra_priority	= 600,
84		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
85		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
86		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
87		.base.cra_module	= THIS_MODULE,
88		.min_keysize		= SERPENT_MIN_KEY_SIZE,
89		.max_keysize		= SERPENT_MAX_KEY_SIZE,
90		.ivsize			= SERPENT_BLOCK_SIZE,
91		.setkey			= serpent_setkey_skcipher,
92		.encrypt		= cbc_encrypt,
93		.decrypt		= cbc_decrypt,
94	},
95};
96
97static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
98
99static int __init serpent_avx2_init(void)
100{
101	const char *feature_name;
102
103	if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
104		pr_info("AVX2 instructions are not detected.\n");
105		return -ENODEV;
106	}
107	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
108				&feature_name)) {
109		pr_info("CPU feature '%s' is not supported.\n", feature_name);
110		return -ENODEV;
111	}
112
113	return simd_register_skciphers_compat(serpent_algs,
114					      ARRAY_SIZE(serpent_algs),
115					      serpent_simd_algs);
116}
117
118static void __exit serpent_avx2_fini(void)
119{
120	simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
121				  serpent_simd_algs);
122}
123
124module_init(serpent_avx2_init);
125module_exit(serpent_avx2_fini);
126
127MODULE_LICENSE("GPL");
128MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized");
129MODULE_ALIAS_CRYPTO("serpent");
130MODULE_ALIAS_CRYPTO("serpent-asm");
131