1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Glue Code for AVX assembler version of Twofish Cipher |
4 | * |
5 | * Copyright (C) 2012 Johannes Goetzfried |
6 | * <Johannes.Goetzfried@informatik.stud.uni-erlangen.de> |
7 | * |
8 | * Copyright © 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/twofish.h> |
18 | |
19 | #include "twofish.h" |
20 | #include "ecb_cbc_helpers.h" |
21 | |
22 | #define TWOFISH_PARALLEL_BLOCKS 8 |
23 | |
24 | /* 8-way parallel cipher functions */ |
25 | asmlinkage void twofish_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src); |
26 | asmlinkage void twofish_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src); |
27 | |
28 | asmlinkage void twofish_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src); |
29 | |
30 | static int twofish_setkey_skcipher(struct crypto_skcipher *tfm, |
31 | const u8 *key, unsigned int keylen) |
32 | { |
33 | return twofish_setkey(tfm: &tfm->base, key, key_len: keylen); |
34 | } |
35 | |
36 | static inline void twofish_enc_blk_3way(const void *ctx, u8 *dst, const u8 *src) |
37 | { |
38 | __twofish_enc_blk_3way(ctx, dst, src, xor: false); |
39 | } |
40 | |
41 | static int ecb_encrypt(struct skcipher_request *req) |
42 | { |
43 | ECB_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS); |
44 | ECB_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_ecb_enc_8way); |
45 | ECB_BLOCK(3, twofish_enc_blk_3way); |
46 | ECB_BLOCK(1, twofish_enc_blk); |
47 | ECB_WALK_END(); |
48 | } |
49 | |
50 | static int ecb_decrypt(struct skcipher_request *req) |
51 | { |
52 | ECB_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS); |
53 | ECB_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_ecb_dec_8way); |
54 | ECB_BLOCK(3, twofish_dec_blk_3way); |
55 | ECB_BLOCK(1, twofish_dec_blk); |
56 | ECB_WALK_END(); |
57 | } |
58 | |
59 | static int cbc_encrypt(struct skcipher_request *req) |
60 | { |
61 | CBC_WALK_START(req, TF_BLOCK_SIZE, -1); |
62 | CBC_ENC_BLOCK(twofish_enc_blk); |
63 | CBC_WALK_END(); |
64 | } |
65 | |
66 | static int cbc_decrypt(struct skcipher_request *req) |
67 | { |
68 | CBC_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS); |
69 | CBC_DEC_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_cbc_dec_8way); |
70 | CBC_DEC_BLOCK(3, twofish_dec_blk_cbc_3way); |
71 | CBC_DEC_BLOCK(1, twofish_dec_blk); |
72 | CBC_WALK_END(); |
73 | } |
74 | |
75 | static struct skcipher_alg twofish_algs[] = { |
76 | { |
77 | .base.cra_name = "__ecb(twofish)" , |
78 | .base.cra_driver_name = "__ecb-twofish-avx" , |
79 | .base.cra_priority = 400, |
80 | .base.cra_flags = CRYPTO_ALG_INTERNAL, |
81 | .base.cra_blocksize = TF_BLOCK_SIZE, |
82 | .base.cra_ctxsize = sizeof(struct twofish_ctx), |
83 | .base.cra_module = THIS_MODULE, |
84 | .min_keysize = TF_MIN_KEY_SIZE, |
85 | .max_keysize = TF_MAX_KEY_SIZE, |
86 | .setkey = twofish_setkey_skcipher, |
87 | .encrypt = ecb_encrypt, |
88 | .decrypt = ecb_decrypt, |
89 | }, { |
90 | .base.cra_name = "__cbc(twofish)" , |
91 | .base.cra_driver_name = "__cbc-twofish-avx" , |
92 | .base.cra_priority = 400, |
93 | .base.cra_flags = CRYPTO_ALG_INTERNAL, |
94 | .base.cra_blocksize = TF_BLOCK_SIZE, |
95 | .base.cra_ctxsize = sizeof(struct twofish_ctx), |
96 | .base.cra_module = THIS_MODULE, |
97 | .min_keysize = TF_MIN_KEY_SIZE, |
98 | .max_keysize = TF_MAX_KEY_SIZE, |
99 | .ivsize = TF_BLOCK_SIZE, |
100 | .setkey = twofish_setkey_skcipher, |
101 | .encrypt = cbc_encrypt, |
102 | .decrypt = cbc_decrypt, |
103 | }, |
104 | }; |
105 | |
106 | static struct simd_skcipher_alg *twofish_simd_algs[ARRAY_SIZE(twofish_algs)]; |
107 | |
108 | static int __init twofish_init(void) |
109 | { |
110 | const char *feature_name; |
111 | |
112 | if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, feature_name: &feature_name)) { |
113 | pr_info("CPU feature '%s' is not supported.\n" , feature_name); |
114 | return -ENODEV; |
115 | } |
116 | |
117 | return simd_register_skciphers_compat(algs: twofish_algs, |
118 | ARRAY_SIZE(twofish_algs), |
119 | simd_algs: twofish_simd_algs); |
120 | } |
121 | |
122 | static void __exit twofish_exit(void) |
123 | { |
124 | simd_unregister_skciphers(algs: twofish_algs, ARRAY_SIZE(twofish_algs), |
125 | simd_algs: twofish_simd_algs); |
126 | } |
127 | |
128 | module_init(twofish_init); |
129 | module_exit(twofish_exit); |
130 | |
131 | MODULE_DESCRIPTION("Twofish Cipher Algorithm, AVX optimized" ); |
132 | MODULE_LICENSE("GPL" ); |
133 | MODULE_ALIAS_CRYPTO("twofish" ); |
134 | |