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_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
110static 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
139static 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
156static int force;
157module_param(force, int, 0);
158MODULE_PARM_DESC(force, "Force module load, ignore CPU blacklist");
159
160static 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
184static 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
191module_init(blowfish_init);
192module_exit(blowfish_fini);
193
194MODULE_LICENSE("GPL");
195MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized");
196MODULE_ALIAS_CRYPTO("blowfish");
197MODULE_ALIAS_CRYPTO("blowfish-asm");
198