2 * Glue Code for assembler optimized version of Blowfish
4 * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
6 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
7 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
8 * CTR part based on code (crypto/ctr.c) by:
9 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
28 #include <crypto/blowfish.h>
29 #include <linux/crypto.h>
30 #include <linux/init.h>
31 #include <linux/module.h>
32 #include <linux/types.h>
33 #include <crypto/algapi.h>
35 /* regular block cipher functions */
36 asmlinkage void __blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src,
38 asmlinkage void blowfish_dec_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src);
40 /* 4-way parallel cipher functions */
41 asmlinkage void __blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
42 const u8 *src, bool xor);
43 asmlinkage void blowfish_dec_blk_4way(struct bf_ctx *ctx, u8 *dst,
46 static inline void blowfish_enc_blk(struct bf_ctx *ctx, u8 *dst, const u8 *src)
48 __blowfish_enc_blk(ctx, dst, src, false);
51 static inline void blowfish_enc_blk_xor(struct bf_ctx *ctx, u8 *dst,
54 __blowfish_enc_blk(ctx, dst, src, true);
57 static inline void blowfish_enc_blk_4way(struct bf_ctx *ctx, u8 *dst,
60 __blowfish_enc_blk_4way(ctx, dst, src, false);
63 static inline void blowfish_enc_blk_xor_4way(struct bf_ctx *ctx, u8 *dst,
66 __blowfish_enc_blk_4way(ctx, dst, src, true);
69 static void blowfish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
71 blowfish_enc_blk(crypto_tfm_ctx(tfm), dst, src);
74 static void blowfish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
76 blowfish_dec_blk(crypto_tfm_ctx(tfm), dst, src);
79 static struct crypto_alg bf_alg = {
80 .cra_name = "blowfish",
81 .cra_driver_name = "blowfish-asm",
83 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
84 .cra_blocksize = BF_BLOCK_SIZE,
85 .cra_ctxsize = sizeof(struct bf_ctx),
87 .cra_module = THIS_MODULE,
88 .cra_list = LIST_HEAD_INIT(bf_alg.cra_list),
91 .cia_min_keysize = BF_MIN_KEY_SIZE,
92 .cia_max_keysize = BF_MAX_KEY_SIZE,
93 .cia_setkey = blowfish_setkey,
94 .cia_encrypt = blowfish_encrypt,
95 .cia_decrypt = blowfish_decrypt,
100 static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
101 void (*fn)(struct bf_ctx *, u8 *, const u8 *),
102 void (*fn_4way)(struct bf_ctx *, u8 *, const u8 *))
104 struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
105 unsigned int bsize = BF_BLOCK_SIZE;
109 err = blkcipher_walk_virt(desc, walk);
111 while ((nbytes = walk->nbytes)) {
112 u8 *wsrc = walk->src.virt.addr;
113 u8 *wdst = walk->dst.virt.addr;
115 /* Process four block batch */
116 if (nbytes >= bsize * 4) {
118 fn_4way(ctx, wdst, wsrc);
123 } while (nbytes >= bsize * 4);
129 /* Handle leftovers */
136 } while (nbytes >= bsize);
139 err = blkcipher_walk_done(desc, walk, nbytes);
145 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
146 struct scatterlist *src, unsigned int nbytes)
148 struct blkcipher_walk walk;
150 blkcipher_walk_init(&walk, dst, src, nbytes);
151 return ecb_crypt(desc, &walk, blowfish_enc_blk, blowfish_enc_blk_4way);
154 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
155 struct scatterlist *src, unsigned int nbytes)
157 struct blkcipher_walk walk;
159 blkcipher_walk_init(&walk, dst, src, nbytes);
160 return ecb_crypt(desc, &walk, blowfish_dec_blk, blowfish_dec_blk_4way);
163 static struct crypto_alg blk_ecb_alg = {
164 .cra_name = "ecb(blowfish)",
165 .cra_driver_name = "ecb-blowfish-asm",
167 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
168 .cra_blocksize = BF_BLOCK_SIZE,
169 .cra_ctxsize = sizeof(struct bf_ctx),
171 .cra_type = &crypto_blkcipher_type,
172 .cra_module = THIS_MODULE,
173 .cra_list = LIST_HEAD_INIT(blk_ecb_alg.cra_list),
176 .min_keysize = BF_MIN_KEY_SIZE,
177 .max_keysize = BF_MAX_KEY_SIZE,
178 .setkey = blowfish_setkey,
179 .encrypt = ecb_encrypt,
180 .decrypt = ecb_decrypt,
185 static unsigned int __cbc_encrypt(struct blkcipher_desc *desc,
186 struct blkcipher_walk *walk)
188 struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
189 unsigned int bsize = BF_BLOCK_SIZE;
190 unsigned int nbytes = walk->nbytes;
191 u64 *src = (u64 *)walk->src.virt.addr;
192 u64 *dst = (u64 *)walk->dst.virt.addr;
193 u64 *iv = (u64 *)walk->iv;
197 blowfish_enc_blk(ctx, (u8 *)dst, (u8 *)dst);
203 } while (nbytes >= bsize);
205 *(u64 *)walk->iv = *iv;
209 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
210 struct scatterlist *src, unsigned int nbytes)
212 struct blkcipher_walk walk;
215 blkcipher_walk_init(&walk, dst, src, nbytes);
216 err = blkcipher_walk_virt(desc, &walk);
218 while ((nbytes = walk.nbytes)) {
219 nbytes = __cbc_encrypt(desc, &walk);
220 err = blkcipher_walk_done(desc, &walk, nbytes);
226 static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
227 struct blkcipher_walk *walk)
229 struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
230 unsigned int bsize = BF_BLOCK_SIZE;
231 unsigned int nbytes = walk->nbytes;
232 u64 *src = (u64 *)walk->src.virt.addr;
233 u64 *dst = (u64 *)walk->dst.virt.addr;
237 /* Start of the last block. */
238 src += nbytes / bsize - 1;
239 dst += nbytes / bsize - 1;
243 /* Process four block batch */
244 if (nbytes >= bsize * 4) {
246 nbytes -= bsize * 4 - bsize;
254 blowfish_dec_blk_4way(ctx, (u8 *)dst, (u8 *)src);
267 } while (nbytes >= bsize * 4);
273 /* Handle leftovers */
275 blowfish_dec_blk(ctx, (u8 *)dst, (u8 *)src);
287 *dst ^= *(u64 *)walk->iv;
288 *(u64 *)walk->iv = last_iv;
293 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
294 struct scatterlist *src, unsigned int nbytes)
296 struct blkcipher_walk walk;
299 blkcipher_walk_init(&walk, dst, src, nbytes);
300 err = blkcipher_walk_virt(desc, &walk);
302 while ((nbytes = walk.nbytes)) {
303 nbytes = __cbc_decrypt(desc, &walk);
304 err = blkcipher_walk_done(desc, &walk, nbytes);
310 static struct crypto_alg blk_cbc_alg = {
311 .cra_name = "cbc(blowfish)",
312 .cra_driver_name = "cbc-blowfish-asm",
314 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
315 .cra_blocksize = BF_BLOCK_SIZE,
316 .cra_ctxsize = sizeof(struct bf_ctx),
318 .cra_type = &crypto_blkcipher_type,
319 .cra_module = THIS_MODULE,
320 .cra_list = LIST_HEAD_INIT(blk_cbc_alg.cra_list),
323 .min_keysize = BF_MIN_KEY_SIZE,
324 .max_keysize = BF_MAX_KEY_SIZE,
325 .ivsize = BF_BLOCK_SIZE,
326 .setkey = blowfish_setkey,
327 .encrypt = cbc_encrypt,
328 .decrypt = cbc_decrypt,
333 static void ctr_crypt_final(struct bf_ctx *ctx, struct blkcipher_walk *walk)
335 u8 *ctrblk = walk->iv;
336 u8 keystream[BF_BLOCK_SIZE];
337 u8 *src = walk->src.virt.addr;
338 u8 *dst = walk->dst.virt.addr;
339 unsigned int nbytes = walk->nbytes;
341 blowfish_enc_blk(ctx, keystream, ctrblk);
342 crypto_xor(keystream, src, nbytes);
343 memcpy(dst, keystream, nbytes);
345 crypto_inc(ctrblk, BF_BLOCK_SIZE);
348 static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
349 struct blkcipher_walk *walk)
351 struct bf_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
352 unsigned int bsize = BF_BLOCK_SIZE;
353 unsigned int nbytes = walk->nbytes;
354 u64 *src = (u64 *)walk->src.virt.addr;
355 u64 *dst = (u64 *)walk->dst.virt.addr;
356 u64 ctrblk = be64_to_cpu(*(__be64 *)walk->iv);
359 /* Process four block batch */
360 if (nbytes >= bsize * 4) {
369 /* create ctrblks for parallel encrypt */
370 ctrblocks[0] = cpu_to_be64(ctrblk++);
371 ctrblocks[1] = cpu_to_be64(ctrblk++);
372 ctrblocks[2] = cpu_to_be64(ctrblk++);
373 ctrblocks[3] = cpu_to_be64(ctrblk++);
375 blowfish_enc_blk_xor_4way(ctx, (u8 *)dst,
380 } while ((nbytes -= bsize * 4) >= bsize * 4);
386 /* Handle leftovers */
391 ctrblocks[0] = cpu_to_be64(ctrblk++);
393 blowfish_enc_blk_xor(ctx, (u8 *)dst, (u8 *)ctrblocks);
397 } while ((nbytes -= bsize) >= bsize);
400 *(__be64 *)walk->iv = cpu_to_be64(ctrblk);
404 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
405 struct scatterlist *src, unsigned int nbytes)
407 struct blkcipher_walk walk;
410 blkcipher_walk_init(&walk, dst, src, nbytes);
411 err = blkcipher_walk_virt_block(desc, &walk, BF_BLOCK_SIZE);
413 while ((nbytes = walk.nbytes) >= BF_BLOCK_SIZE) {
414 nbytes = __ctr_crypt(desc, &walk);
415 err = blkcipher_walk_done(desc, &walk, nbytes);
419 ctr_crypt_final(crypto_blkcipher_ctx(desc->tfm), &walk);
420 err = blkcipher_walk_done(desc, &walk, 0);
426 static struct crypto_alg blk_ctr_alg = {
427 .cra_name = "ctr(blowfish)",
428 .cra_driver_name = "ctr-blowfish-asm",
430 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
432 .cra_ctxsize = sizeof(struct bf_ctx),
434 .cra_type = &crypto_blkcipher_type,
435 .cra_module = THIS_MODULE,
436 .cra_list = LIST_HEAD_INIT(blk_ctr_alg.cra_list),
439 .min_keysize = BF_MIN_KEY_SIZE,
440 .max_keysize = BF_MAX_KEY_SIZE,
441 .ivsize = BF_BLOCK_SIZE,
442 .setkey = blowfish_setkey,
443 .encrypt = ctr_crypt,
444 .decrypt = ctr_crypt,
449 static int __init init(void)
453 err = crypto_register_alg(&bf_alg);
456 err = crypto_register_alg(&blk_ecb_alg);
459 err = crypto_register_alg(&blk_cbc_alg);
462 err = crypto_register_alg(&blk_ctr_alg);
469 crypto_unregister_alg(&blk_cbc_alg);
471 crypto_unregister_alg(&blk_ecb_alg);
473 crypto_unregister_alg(&bf_alg);
478 static void __exit fini(void)
480 crypto_unregister_alg(&blk_ctr_alg);
481 crypto_unregister_alg(&blk_cbc_alg);
482 crypto_unregister_alg(&blk_ecb_alg);
483 crypto_unregister_alg(&bf_alg);
489 MODULE_LICENSE("GPL");
490 MODULE_DESCRIPTION("Blowfish Cipher Algorithm, asm optimized");
491 MODULE_ALIAS("blowfish");
492 MODULE_ALIAS("blowfish-asm");