tjh.dev
Linux kernel mirror (for testing)
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linux
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 <linux/export.h>
16#include <crypto/algapi.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_blocksize = SERPENT_BLOCK_SIZE,
78 .base.cra_ctxsize = sizeof(struct serpent_ctx),
79 .base.cra_module = THIS_MODULE,
80 .min_keysize = SERPENT_MIN_KEY_SIZE,
81 .max_keysize = SERPENT_MAX_KEY_SIZE,
82 .setkey = serpent_setkey_skcipher,
83 .encrypt = ecb_encrypt,
84 .decrypt = ecb_decrypt,
85 }, {
86 .base.cra_name = "cbc(serpent)",
87 .base.cra_driver_name = "cbc-serpent-avx",
88 .base.cra_priority = 500,
89 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
90 .base.cra_ctxsize = sizeof(struct serpent_ctx),
91 .base.cra_module = THIS_MODULE,
92 .min_keysize = SERPENT_MIN_KEY_SIZE,
93 .max_keysize = SERPENT_MAX_KEY_SIZE,
94 .ivsize = SERPENT_BLOCK_SIZE,
95 .setkey = serpent_setkey_skcipher,
96 .encrypt = cbc_encrypt,
97 .decrypt = cbc_decrypt,
98 },
99};
100
101static int __init serpent_init(void)
102{
103 const char *feature_name;
104
105 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
106 &feature_name)) {
107 pr_info("CPU feature '%s' is not supported.\n", feature_name);
108 return -ENODEV;
109 }
110
111 return crypto_register_skciphers(serpent_algs,
112 ARRAY_SIZE(serpent_algs));
113}
114
115static void __exit serpent_exit(void)
116{
117 crypto_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs));
118}
119
120module_init(serpent_init);
121module_exit(serpent_exit);
122
123MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX optimized");
124MODULE_LICENSE("GPL");
125MODULE_ALIAS_CRYPTO("serpent");