tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Glue Code for assembler optimized version of Blowfish
4 *
5 * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
6 *
7 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
8 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
9 */
10
11#include <crypto/algapi.h>
12#include <crypto/blowfish.h>
13#include <crypto/internal/skcipher.h>
14#include <linux/crypto.h>
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/types.h>
18
19#include "ecb_cbc_helpers.h"
20
21/* regular block cipher functions */
22asmlinkage void blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src);
23asmlinkage void blowfish_dec_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src);
24
25/* 4-way parallel cipher functions */
26asmlinkage void blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
27 const u8 *src);
28asmlinkage void __blowfish_dec_blk_4way(struct bf_ctx *ctx, u8 *dst,
29 const u8 *src, bool cbc);
30
31static inline void blowfish_dec_ecb_4way(struct bf_ctx *ctx, u8 *dst,
32 const u8 *src)
33{
34 return __blowfish_dec_blk_4way(ctx, dst, src, false);
35}
36
37static inline void blowfish_dec_cbc_4way(struct bf_ctx *ctx, u8 *dst,
38 const u8 *src)
39{
40 return __blowfish_dec_blk_4way(ctx, dst, src, true);
41}
42
43static void blowfish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
44{
45 blowfish_enc_blk(crypto_tfm_ctx(tfm), dst, src);
46}
47
48static void blowfish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
49{
50 blowfish_dec_blk(crypto_tfm_ctx(tfm), dst, src);
51}
52
53static int blowfish_setkey_skcipher(struct crypto_skcipher *tfm,
54 const u8 *key, unsigned int keylen)
55{
56 return blowfish_setkey(&tfm->base, key, keylen);
57}
58
59static int ecb_encrypt(struct skcipher_request *req)
60{
61 ECB_WALK_START(req, BF_BLOCK_SIZE, -1);
62 ECB_BLOCK(4, blowfish_enc_blk_4way);
63 ECB_BLOCK(1, blowfish_enc_blk);
64 ECB_WALK_END();
65}
66
67static int ecb_decrypt(struct skcipher_request *req)
68{
69 ECB_WALK_START(req, BF_BLOCK_SIZE, -1);
70 ECB_BLOCK(4, blowfish_dec_ecb_4way);
71 ECB_BLOCK(1, blowfish_dec_blk);
72 ECB_WALK_END();
73}
74
75static int cbc_encrypt(struct skcipher_request *req)
76{
77 CBC_WALK_START(req, BF_BLOCK_SIZE, -1);
78 CBC_ENC_BLOCK(blowfish_enc_blk);
79 CBC_WALK_END();
80}
81
82static int cbc_decrypt(struct skcipher_request *req)
83{
84 CBC_WALK_START(req, BF_BLOCK_SIZE, -1);
85 CBC_DEC_BLOCK(4, blowfish_dec_cbc_4way);
86 CBC_DEC_BLOCK(1, blowfish_dec_blk);
87 CBC_WALK_END();
88}
89
90static struct crypto_alg bf_cipher_alg = {
91 .cra_name = "blowfish",
92 .cra_driver_name = "blowfish-asm",
93 .cra_priority = 200,
94 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
95 .cra_blocksize = BF_BLOCK_SIZE,
96 .cra_ctxsize = sizeof(struct bf_ctx),
97 .cra_module = THIS_MODULE,
98 .cra_u = {
99 .cipher = {
100 .cia_min_keysize = BF_MIN_KEY_SIZE,
101 .cia_max_keysize = BF_MAX_KEY_SIZE,
102 .cia_setkey = blowfish_setkey,
103 .cia_encrypt = blowfish_encrypt,
104 .cia_decrypt = blowfish_decrypt,
105 }
106 }
107};
108
109static struct skcipher_alg bf_skcipher_algs[] = {
110 {
111 .base.cra_name = "ecb(blowfish)",
112 .base.cra_driver_name = "ecb-blowfish-asm",
113 .base.cra_priority = 300,
114 .base.cra_blocksize = BF_BLOCK_SIZE,
115 .base.cra_ctxsize = sizeof(struct bf_ctx),
116 .base.cra_module = THIS_MODULE,
117 .min_keysize = BF_MIN_KEY_SIZE,
118 .max_keysize = BF_MAX_KEY_SIZE,
119 .setkey = blowfish_setkey_skcipher,
120 .encrypt = ecb_encrypt,
121 .decrypt = ecb_decrypt,
122 }, {
123 .base.cra_name = "cbc(blowfish)",
124 .base.cra_driver_name = "cbc-blowfish-asm",
125 .base.cra_priority = 300,
126 .base.cra_blocksize = BF_BLOCK_SIZE,
127 .base.cra_ctxsize = sizeof(struct bf_ctx),
128 .base.cra_module = THIS_MODULE,
129 .min_keysize = BF_MIN_KEY_SIZE,
130 .max_keysize = BF_MAX_KEY_SIZE,
131 .ivsize = BF_BLOCK_SIZE,
132 .setkey = blowfish_setkey_skcipher,
133 .encrypt = cbc_encrypt,
134 .decrypt = cbc_decrypt,
135 },
136};
137
138static bool is_blacklisted_cpu(void)
139{
140 if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
141 return false;
142
143 if (boot_cpu_data.x86 == 0x0f) {
144 /*
145 * On Pentium 4, blowfish-x86_64 is slower than generic C
146 * implementation because use of 64bit rotates (which are really
147 * slow on P4). Therefore blacklist P4s.
148 */
149 return true;
150 }
151
152 return false;
153}
154
155static int force;
156module_param(force, int, 0);
157MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
158
159static int __init blowfish_init(void)
160{
161 int err;
162
163 if (!force && is_blacklisted_cpu()) {
164 printk(KERN_INFO
165 "blowfish-x86_64: performance on this CPU "
166 "would be suboptimal: disabling "
167 "blowfish-x86_64.\n");
168 return -ENODEV;
169 }
170
171 err = crypto_register_alg(&bf_cipher_alg);
172 if (err)
173 return err;
174
175 err = crypto_register_skciphers(bf_skcipher_algs,
176 ARRAY_SIZE(bf_skcipher_algs));
177 if (err)
178 crypto_unregister_alg(&bf_cipher_alg);
179
180 return err;
181}
182
183static void __exit blowfish_fini(void)
184{
185 crypto_unregister_alg(&bf_cipher_alg);
186 crypto_unregister_skciphers(bf_skcipher_algs,
187 ARRAY_SIZE(bf_skcipher_algs));
188}
189
190module_init(blowfish_init);
191module_exit(blowfish_fini);
192
193MODULE_LICENSE("GPL");
194MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized");
195MODULE_ALIAS_CRYPTO("blowfish");
196MODULE_ALIAS_CRYPTO("blowfish-asm");