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 */
22 asmlinkage void blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src);
23 asmlinkage void blowfish_dec_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src);
24
25 /* 4-way parallel cipher functions */
26 asmlinkage void blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
27 const u8 *src);
28 asmlinkage void __blowfish_dec_blk_4way(struct bf_ctx *ctx, u8 *dst,
29 const u8 *src, bool cbc);
30
31 static 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
37 static 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
43 static 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
48 static 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
53 static 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
59 static 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
67 static 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
75 static 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
82 static 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
90 static 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_alignmask = 0,
98 .cra_module = THIS_MODULE,
99 .cra_u = {
100 .cipher = {
101 .cia_min_keysize = BF_MIN_KEY_SIZE,
102 .cia_max_keysize = BF_MAX_KEY_SIZE,
103 .cia_setkey = blowfish_setkey,
104 .cia_encrypt = blowfish_encrypt,
105 .cia_decrypt = blowfish_decrypt,
106 }
107 }
108 };
109
110 static struct skcipher_alg bf_skcipher_algs[] = {
111 {
112 .base.cra_name = "ecb(blowfish)",
113 .base.cra_driver_name = "ecb-blowfish-asm",
114 .base.cra_priority = 300,
115 .base.cra_blocksize = BF_BLOCK_SIZE,
116 .base.cra_ctxsize = sizeof(struct bf_ctx),
117 .base.cra_module = THIS_MODULE,
118 .min_keysize = BF_MIN_KEY_SIZE,
119 .max_keysize = BF_MAX_KEY_SIZE,
120 .setkey = blowfish_setkey_skcipher,
121 .encrypt = ecb_encrypt,
122 .decrypt = ecb_decrypt,
123 }, {
124 .base.cra_name = "cbc(blowfish)",
125 .base.cra_driver_name = "cbc-blowfish-asm",
126 .base.cra_priority = 300,
127 .base.cra_blocksize = BF_BLOCK_SIZE,
128 .base.cra_ctxsize = sizeof(struct bf_ctx),
129 .base.cra_module = THIS_MODULE,
130 .min_keysize = BF_MIN_KEY_SIZE,
131 .max_keysize = BF_MAX_KEY_SIZE,
132 .ivsize = BF_BLOCK_SIZE,
133 .setkey = blowfish_setkey_skcipher,
134 .encrypt = cbc_encrypt,
135 .decrypt = cbc_decrypt,
136 },
137 };
138
139 static bool is_blacklisted_cpu(void)
140 {
141 if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
142 return false;
143
144 if (boot_cpu_data.x86 == 0x0f) {
145 /*
146 * On Pentium 4, blowfish-x86_64 is slower than generic C
147 * implementation because use of 64bit rotates (which are really
148 * slow on P4). Therefore blacklist P4s.
149 */
150 return true;
151 }
152
153 return false;
154 }
155
156 static int force;
157 module_param(force, int, 0);
158 MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
159
160 static int __init blowfish_init(void)
161 {
162 int err;
163
164 if (!force && is_blacklisted_cpu()) {
165 printk(KERN_INFO
166 "blowfish-x86_64: performance on this CPU "
167 "would be suboptimal: disabling "
168 "blowfish-x86_64.\n");
169 return -ENODEV;
170 }
171
172 err = crypto_register_alg(&bf_cipher_alg);
173 if (err)
174 return err;
175
176 err = crypto_register_skciphers(bf_skcipher_algs,
177 ARRAY_SIZE(bf_skcipher_algs));
178 if (err)
179 crypto_unregister_alg(&bf_cipher_alg);
180
181 return err;
182 }
183
184 static void __exit blowfish_fini(void)
185 {
186 crypto_unregister_alg(&bf_cipher_alg);
187 crypto_unregister_skciphers(bf_skcipher_algs,
188 ARRAY_SIZE(bf_skcipher_algs));
189 }
190
191 module_init(blowfish_init);
192 module_exit(blowfish_fini);
193
194 MODULE_LICENSE("GPL");
195 MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized");
196 MODULE_ALIAS_CRYPTO("blowfish");
197 MODULE_ALIAS_CRYPTO("blowfish-asm");
198
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.