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 */
23 asmlinkage void serpent_ecb_enc_8way_avx(const void *ctx, u8 *dst,
24 const u8 *src);
25 EXPORT_SYMBOL_GPL(serpent_ecb_enc_8way_avx);
26
27 asmlinkage void serpent_ecb_dec_8way_avx(const void *ctx, u8 *dst,
28 const u8 *src);
29 EXPORT_SYMBOL_GPL(serpent_ecb_dec_8way_avx);
30
31 asmlinkage void serpent_cbc_dec_8way_avx(const void *ctx, u8 *dst,
32 const u8 *src);
33 EXPORT_SYMBOL_GPL(serpent_cbc_dec_8way_avx);
34
35 static 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
41 static 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
49 static 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
57 static 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
64 static 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
72 static 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
103 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
104
105 static 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
120 static void __exit serpent_exit(void)
121 {
122 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
123 serpent_simd_algs);
124 }
125
126 module_init(serpent_init);
127 module_exit(serpent_exit);
128
129 MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX optimized");
130 MODULE_LICENSE("GPL");
131 MODULE_ALIAS_CRYPTO("serpent");
132
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