1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Glue Code for the AVX assembler implementation of the Cast6 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/cast6.h>
17 #include <crypto/internal/simd.h>
18
19 #include "ecb_cbc_helpers.h"
20
21 #define CAST6_PARALLEL_BLOCKS 8
22
23 asmlinkage void cast6_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src);
24 asmlinkage void cast6_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src);
25
26 asmlinkage void cast6_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src);
27
28 static int cast6_setkey_skcipher(struct crypto_skcipher *tfm,
29 const u8 *key, unsigned int keylen)
30 {
31 return cast6_setkey(&tfm->base, key, keylen);
32 }
33
34 static int ecb_encrypt(struct skcipher_request *req)
35 {
36 ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
37 ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_enc_8way);
38 ECB_BLOCK(1, __cast6_encrypt);
39 ECB_WALK_END();
40 }
41
42 static int ecb_decrypt(struct skcipher_request *req)
43 {
44 ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
45 ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_dec_8way);
46 ECB_BLOCK(1, __cast6_decrypt);
47 ECB_WALK_END();
48 }
49
50 static int cbc_encrypt(struct skcipher_request *req)
51 {
52 CBC_WALK_START(req, CAST6_BLOCK_SIZE, -1);
53 CBC_ENC_BLOCK(__cast6_encrypt);
54 CBC_WALK_END();
55 }
56
57 static int cbc_decrypt(struct skcipher_request *req)
58 {
59 CBC_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
60 CBC_DEC_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_cbc_dec_8way);
61 CBC_DEC_BLOCK(1, __cast6_decrypt);
62 CBC_WALK_END();
63 }
64
65 static struct skcipher_alg cast6_algs[] = {
66 {
67 .base.cra_name = "__ecb(cast6)",
68 .base.cra_driver_name = "__ecb-cast6-avx",
69 .base.cra_priority = 200,
70 .base.cra_flags = CRYPTO_ALG_INTERNAL,
71 .base.cra_blocksize = CAST6_BLOCK_SIZE,
72 .base.cra_ctxsize = sizeof(struct cast6_ctx),
73 .base.cra_module = THIS_MODULE,
74 .min_keysize = CAST6_MIN_KEY_SIZE,
75 .max_keysize = CAST6_MAX_KEY_SIZE,
76 .setkey = cast6_setkey_skcipher,
77 .encrypt = ecb_encrypt,
78 .decrypt = ecb_decrypt,
79 }, {
80 .base.cra_name = "__cbc(cast6)",
81 .base.cra_driver_name = "__cbc-cast6-avx",
82 .base.cra_priority = 200,
83 .base.cra_flags = CRYPTO_ALG_INTERNAL,
84 .base.cra_blocksize = CAST6_BLOCK_SIZE,
85 .base.cra_ctxsize = sizeof(struct cast6_ctx),
86 .base.cra_module = THIS_MODULE,
87 .min_keysize = CAST6_MIN_KEY_SIZE,
88 .max_keysize = CAST6_MAX_KEY_SIZE,
89 .ivsize = CAST6_BLOCK_SIZE,
90 .setkey = cast6_setkey_skcipher,
91 .encrypt = cbc_encrypt,
92 .decrypt = cbc_decrypt,
93 },
94 };
95
96 static struct simd_skcipher_alg *cast6_simd_algs[ARRAY_SIZE(cast6_algs)];
97
98 static int __init cast6_init(void)
99 {
100 const char *feature_name;
101
102 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
103 &feature_name)) {
104 pr_info("CPU feature '%s' is not supported.\n", feature_name);
105 return -ENODEV;
106 }
107
108 return simd_register_skciphers_compat(cast6_algs,
109 ARRAY_SIZE(cast6_algs),
110 cast6_simd_algs);
111 }
112
113 static void __exit cast6_exit(void)
114 {
115 simd_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs),
116 cast6_simd_algs);
117 }
118
119 module_init(cast6_init);
120 module_exit(cast6_exit);
121
122 MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
123 MODULE_LICENSE("GPL");
124 MODULE_ALIAS_CRYPTO("cast6");
125
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