blowfish_glue.c

  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");