4 * s390 implementation of the DES Cipher Algorithm.
6 * Copyright IBM Corp. 2003,2007
7 * Author(s): Thomas Spatzier
8 * Jan Glauber (jan.glauber@de.ibm.com)
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
17 #include <crypto/algapi.h>
18 #include <linux/init.h>
19 #include <linux/module.h>
21 #include "crypt_s390.h"
22 #include "crypto_des.h"
24 #define DES_BLOCK_SIZE 8
25 #define DES_KEY_SIZE 8
27 #define DES3_128_KEY_SIZE (2 * DES_KEY_SIZE)
28 #define DES3_128_BLOCK_SIZE DES_BLOCK_SIZE
30 #define DES3_192_KEY_SIZE (3 * DES_KEY_SIZE)
31 #define DES3_192_BLOCK_SIZE DES_BLOCK_SIZE
33 struct crypt_s390_des_ctx {
34 u8 iv[DES_BLOCK_SIZE];
38 struct crypt_s390_des3_128_ctx {
39 u8 iv[DES_BLOCK_SIZE];
40 u8 key[DES3_128_KEY_SIZE];
43 struct crypt_s390_des3_192_ctx {
44 u8 iv[DES_BLOCK_SIZE];
45 u8 key[DES3_192_KEY_SIZE];
48 static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
51 struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm);
52 u32 *flags = &tfm->crt_flags;
55 /* test if key is valid (not a weak key) */
56 ret = crypto_des_check_key(key, keylen, flags);
58 memcpy(dctx->key, key, keylen);
62 static void des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
64 struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm);
66 crypt_s390_km(KM_DEA_ENCRYPT, dctx->key, out, in, DES_BLOCK_SIZE);
69 static void des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
71 struct crypt_s390_des_ctx *dctx = crypto_tfm_ctx(tfm);
73 crypt_s390_km(KM_DEA_DECRYPT, dctx->key, out, in, DES_BLOCK_SIZE);
76 static struct crypto_alg des_alg = {
78 .cra_driver_name = "des-s390",
79 .cra_priority = CRYPT_S390_PRIORITY,
80 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
81 .cra_blocksize = DES_BLOCK_SIZE,
82 .cra_ctxsize = sizeof(struct crypt_s390_des_ctx),
83 .cra_module = THIS_MODULE,
84 .cra_list = LIST_HEAD_INIT(des_alg.cra_list),
87 .cia_min_keysize = DES_KEY_SIZE,
88 .cia_max_keysize = DES_KEY_SIZE,
89 .cia_setkey = des_setkey,
90 .cia_encrypt = des_encrypt,
91 .cia_decrypt = des_decrypt,
96 static int ecb_desall_crypt(struct blkcipher_desc *desc, long func,
97 void *param, struct blkcipher_walk *walk)
99 int ret = blkcipher_walk_virt(desc, walk);
102 while ((nbytes = walk->nbytes)) {
103 /* only use complete blocks */
104 unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
105 u8 *out = walk->dst.virt.addr;
106 u8 *in = walk->src.virt.addr;
108 ret = crypt_s390_km(func, param, out, in, n);
109 BUG_ON((ret < 0) || (ret != n));
111 nbytes &= DES_BLOCK_SIZE - 1;
112 ret = blkcipher_walk_done(desc, walk, nbytes);
118 static int cbc_desall_crypt(struct blkcipher_desc *desc, long func,
119 void *param, struct blkcipher_walk *walk)
121 int ret = blkcipher_walk_virt(desc, walk);
122 unsigned int nbytes = walk->nbytes;
127 memcpy(param, walk->iv, DES_BLOCK_SIZE);
129 /* only use complete blocks */
130 unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
131 u8 *out = walk->dst.virt.addr;
132 u8 *in = walk->src.virt.addr;
134 ret = crypt_s390_kmc(func, param, out, in, n);
135 BUG_ON((ret < 0) || (ret != n));
137 nbytes &= DES_BLOCK_SIZE - 1;
138 ret = blkcipher_walk_done(desc, walk, nbytes);
139 } while ((nbytes = walk->nbytes));
140 memcpy(walk->iv, param, DES_BLOCK_SIZE);
146 static int ecb_des_encrypt(struct blkcipher_desc *desc,
147 struct scatterlist *dst, struct scatterlist *src,
150 struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
151 struct blkcipher_walk walk;
153 blkcipher_walk_init(&walk, dst, src, nbytes);
154 return ecb_desall_crypt(desc, KM_DEA_ENCRYPT, sctx->key, &walk);
157 static int ecb_des_decrypt(struct blkcipher_desc *desc,
158 struct scatterlist *dst, struct scatterlist *src,
161 struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
162 struct blkcipher_walk walk;
164 blkcipher_walk_init(&walk, dst, src, nbytes);
165 return ecb_desall_crypt(desc, KM_DEA_DECRYPT, sctx->key, &walk);
168 static struct crypto_alg ecb_des_alg = {
169 .cra_name = "ecb(des)",
170 .cra_driver_name = "ecb-des-s390",
171 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
172 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
173 .cra_blocksize = DES_BLOCK_SIZE,
174 .cra_ctxsize = sizeof(struct crypt_s390_des_ctx),
175 .cra_type = &crypto_blkcipher_type,
176 .cra_module = THIS_MODULE,
177 .cra_list = LIST_HEAD_INIT(ecb_des_alg.cra_list),
180 .min_keysize = DES_KEY_SIZE,
181 .max_keysize = DES_KEY_SIZE,
182 .setkey = des_setkey,
183 .encrypt = ecb_des_encrypt,
184 .decrypt = ecb_des_decrypt,
189 static int cbc_des_encrypt(struct blkcipher_desc *desc,
190 struct scatterlist *dst, struct scatterlist *src,
193 struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
194 struct blkcipher_walk walk;
196 blkcipher_walk_init(&walk, dst, src, nbytes);
197 return cbc_desall_crypt(desc, KMC_DEA_ENCRYPT, sctx->iv, &walk);
200 static int cbc_des_decrypt(struct blkcipher_desc *desc,
201 struct scatterlist *dst, struct scatterlist *src,
204 struct crypt_s390_des_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
205 struct blkcipher_walk walk;
207 blkcipher_walk_init(&walk, dst, src, nbytes);
208 return cbc_desall_crypt(desc, KMC_DEA_DECRYPT, sctx->iv, &walk);
211 static struct crypto_alg cbc_des_alg = {
212 .cra_name = "cbc(des)",
213 .cra_driver_name = "cbc-des-s390",
214 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
215 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
216 .cra_blocksize = DES_BLOCK_SIZE,
217 .cra_ctxsize = sizeof(struct crypt_s390_des_ctx),
218 .cra_type = &crypto_blkcipher_type,
219 .cra_module = THIS_MODULE,
220 .cra_list = LIST_HEAD_INIT(cbc_des_alg.cra_list),
223 .min_keysize = DES_KEY_SIZE,
224 .max_keysize = DES_KEY_SIZE,
225 .ivsize = DES_BLOCK_SIZE,
226 .setkey = des_setkey,
227 .encrypt = cbc_des_encrypt,
228 .decrypt = cbc_des_decrypt,
236 * For DES-EDE3, there is no known need to reject weak or
237 * complementation keys. Any weakness is obviated by the use of
240 * However, if the two independent 64-bit keys are equal,
241 * then the DES3 operation is simply the same as DES.
242 * Implementers MUST reject keys that exhibit this property.
245 static int des3_128_setkey(struct crypto_tfm *tfm, const u8 *key,
249 struct crypt_s390_des3_128_ctx *dctx = crypto_tfm_ctx(tfm);
250 const u8 *temp_key = key;
251 u32 *flags = &tfm->crt_flags;
253 if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE)) &&
254 (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
255 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
258 for (i = 0; i < 2; i++, temp_key += DES_KEY_SIZE) {
259 ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
263 memcpy(dctx->key, key, keylen);
267 static void des3_128_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
269 struct crypt_s390_des3_128_ctx *dctx = crypto_tfm_ctx(tfm);
271 crypt_s390_km(KM_TDEA_128_ENCRYPT, dctx->key, dst, (void*)src,
272 DES3_128_BLOCK_SIZE);
275 static void des3_128_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
277 struct crypt_s390_des3_128_ctx *dctx = crypto_tfm_ctx(tfm);
279 crypt_s390_km(KM_TDEA_128_DECRYPT, dctx->key, dst, (void*)src,
280 DES3_128_BLOCK_SIZE);
283 static struct crypto_alg des3_128_alg = {
284 .cra_name = "des3_ede128",
285 .cra_driver_name = "des3_ede128-s390",
286 .cra_priority = CRYPT_S390_PRIORITY,
287 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
288 .cra_blocksize = DES3_128_BLOCK_SIZE,
289 .cra_ctxsize = sizeof(struct crypt_s390_des3_128_ctx),
290 .cra_module = THIS_MODULE,
291 .cra_list = LIST_HEAD_INIT(des3_128_alg.cra_list),
294 .cia_min_keysize = DES3_128_KEY_SIZE,
295 .cia_max_keysize = DES3_128_KEY_SIZE,
296 .cia_setkey = des3_128_setkey,
297 .cia_encrypt = des3_128_encrypt,
298 .cia_decrypt = des3_128_decrypt,
303 static int ecb_des3_128_encrypt(struct blkcipher_desc *desc,
304 struct scatterlist *dst,
305 struct scatterlist *src, unsigned int nbytes)
307 struct crypt_s390_des3_128_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
308 struct blkcipher_walk walk;
310 blkcipher_walk_init(&walk, dst, src, nbytes);
311 return ecb_desall_crypt(desc, KM_TDEA_128_ENCRYPT, sctx->key, &walk);
314 static int ecb_des3_128_decrypt(struct blkcipher_desc *desc,
315 struct scatterlist *dst,
316 struct scatterlist *src, unsigned int nbytes)
318 struct crypt_s390_des3_128_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
319 struct blkcipher_walk walk;
321 blkcipher_walk_init(&walk, dst, src, nbytes);
322 return ecb_desall_crypt(desc, KM_TDEA_128_DECRYPT, sctx->key, &walk);
325 static struct crypto_alg ecb_des3_128_alg = {
326 .cra_name = "ecb(des3_ede128)",
327 .cra_driver_name = "ecb-des3_ede128-s390",
328 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
329 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
330 .cra_blocksize = DES3_128_BLOCK_SIZE,
331 .cra_ctxsize = sizeof(struct crypt_s390_des3_128_ctx),
332 .cra_type = &crypto_blkcipher_type,
333 .cra_module = THIS_MODULE,
334 .cra_list = LIST_HEAD_INIT(
335 ecb_des3_128_alg.cra_list),
338 .min_keysize = DES3_128_KEY_SIZE,
339 .max_keysize = DES3_128_KEY_SIZE,
340 .setkey = des3_128_setkey,
341 .encrypt = ecb_des3_128_encrypt,
342 .decrypt = ecb_des3_128_decrypt,
347 static int cbc_des3_128_encrypt(struct blkcipher_desc *desc,
348 struct scatterlist *dst,
349 struct scatterlist *src, unsigned int nbytes)
351 struct crypt_s390_des3_128_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
352 struct blkcipher_walk walk;
354 blkcipher_walk_init(&walk, dst, src, nbytes);
355 return cbc_desall_crypt(desc, KMC_TDEA_128_ENCRYPT, sctx->iv, &walk);
358 static int cbc_des3_128_decrypt(struct blkcipher_desc *desc,
359 struct scatterlist *dst,
360 struct scatterlist *src, unsigned int nbytes)
362 struct crypt_s390_des3_128_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
363 struct blkcipher_walk walk;
365 blkcipher_walk_init(&walk, dst, src, nbytes);
366 return cbc_desall_crypt(desc, KMC_TDEA_128_DECRYPT, sctx->iv, &walk);
369 static struct crypto_alg cbc_des3_128_alg = {
370 .cra_name = "cbc(des3_ede128)",
371 .cra_driver_name = "cbc-des3_ede128-s390",
372 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
373 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
374 .cra_blocksize = DES3_128_BLOCK_SIZE,
375 .cra_ctxsize = sizeof(struct crypt_s390_des3_128_ctx),
376 .cra_type = &crypto_blkcipher_type,
377 .cra_module = THIS_MODULE,
378 .cra_list = LIST_HEAD_INIT(
379 cbc_des3_128_alg.cra_list),
382 .min_keysize = DES3_128_KEY_SIZE,
383 .max_keysize = DES3_128_KEY_SIZE,
384 .ivsize = DES3_128_BLOCK_SIZE,
385 .setkey = des3_128_setkey,
386 .encrypt = cbc_des3_128_encrypt,
387 .decrypt = cbc_des3_128_decrypt,
395 * For DES-EDE3, there is no known need to reject weak or
396 * complementation keys. Any weakness is obviated by the use of
399 * However, if the first two or last two independent 64-bit keys are
400 * equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
401 * same as DES. Implementers MUST reject keys that exhibit this
405 static int des3_192_setkey(struct crypto_tfm *tfm, const u8 *key,
409 struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);
410 const u8 *temp_key = key;
411 u32 *flags = &tfm->crt_flags;
413 if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
414 memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
416 (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
417 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
420 for (i = 0; i < 3; i++, temp_key += DES_KEY_SIZE) {
421 ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
425 memcpy(dctx->key, key, keylen);
429 static void des3_192_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
431 struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);
433 crypt_s390_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src,
434 DES3_192_BLOCK_SIZE);
437 static void des3_192_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
439 struct crypt_s390_des3_192_ctx *dctx = crypto_tfm_ctx(tfm);
441 crypt_s390_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src,
442 DES3_192_BLOCK_SIZE);
445 static struct crypto_alg des3_192_alg = {
446 .cra_name = "des3_ede",
447 .cra_driver_name = "des3_ede-s390",
448 .cra_priority = CRYPT_S390_PRIORITY,
449 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
450 .cra_blocksize = DES3_192_BLOCK_SIZE,
451 .cra_ctxsize = sizeof(struct crypt_s390_des3_192_ctx),
452 .cra_module = THIS_MODULE,
453 .cra_list = LIST_HEAD_INIT(des3_192_alg.cra_list),
456 .cia_min_keysize = DES3_192_KEY_SIZE,
457 .cia_max_keysize = DES3_192_KEY_SIZE,
458 .cia_setkey = des3_192_setkey,
459 .cia_encrypt = des3_192_encrypt,
460 .cia_decrypt = des3_192_decrypt,
465 static int ecb_des3_192_encrypt(struct blkcipher_desc *desc,
466 struct scatterlist *dst,
467 struct scatterlist *src, unsigned int nbytes)
469 struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
470 struct blkcipher_walk walk;
472 blkcipher_walk_init(&walk, dst, src, nbytes);
473 return ecb_desall_crypt(desc, KM_TDEA_192_ENCRYPT, sctx->key, &walk);
476 static int ecb_des3_192_decrypt(struct blkcipher_desc *desc,
477 struct scatterlist *dst,
478 struct scatterlist *src, unsigned int nbytes)
480 struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
481 struct blkcipher_walk walk;
483 blkcipher_walk_init(&walk, dst, src, nbytes);
484 return ecb_desall_crypt(desc, KM_TDEA_192_DECRYPT, sctx->key, &walk);
487 static struct crypto_alg ecb_des3_192_alg = {
488 .cra_name = "ecb(des3_ede)",
489 .cra_driver_name = "ecb-des3_ede-s390",
490 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
491 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
492 .cra_blocksize = DES3_192_BLOCK_SIZE,
493 .cra_ctxsize = sizeof(struct crypt_s390_des3_192_ctx),
494 .cra_type = &crypto_blkcipher_type,
495 .cra_module = THIS_MODULE,
496 .cra_list = LIST_HEAD_INIT(
497 ecb_des3_192_alg.cra_list),
500 .min_keysize = DES3_192_KEY_SIZE,
501 .max_keysize = DES3_192_KEY_SIZE,
502 .setkey = des3_192_setkey,
503 .encrypt = ecb_des3_192_encrypt,
504 .decrypt = ecb_des3_192_decrypt,
509 static int cbc_des3_192_encrypt(struct blkcipher_desc *desc,
510 struct scatterlist *dst,
511 struct scatterlist *src, unsigned int nbytes)
513 struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
514 struct blkcipher_walk walk;
516 blkcipher_walk_init(&walk, dst, src, nbytes);
517 return cbc_desall_crypt(desc, KMC_TDEA_192_ENCRYPT, sctx->iv, &walk);
520 static int cbc_des3_192_decrypt(struct blkcipher_desc *desc,
521 struct scatterlist *dst,
522 struct scatterlist *src, unsigned int nbytes)
524 struct crypt_s390_des3_192_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
525 struct blkcipher_walk walk;
527 blkcipher_walk_init(&walk, dst, src, nbytes);
528 return cbc_desall_crypt(desc, KMC_TDEA_192_DECRYPT, sctx->iv, &walk);
531 static struct crypto_alg cbc_des3_192_alg = {
532 .cra_name = "cbc(des3_ede)",
533 .cra_driver_name = "cbc-des3_ede-s390",
534 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
535 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
536 .cra_blocksize = DES3_192_BLOCK_SIZE,
537 .cra_ctxsize = sizeof(struct crypt_s390_des3_192_ctx),
538 .cra_type = &crypto_blkcipher_type,
539 .cra_module = THIS_MODULE,
540 .cra_list = LIST_HEAD_INIT(
541 cbc_des3_192_alg.cra_list),
544 .min_keysize = DES3_192_KEY_SIZE,
545 .max_keysize = DES3_192_KEY_SIZE,
546 .ivsize = DES3_192_BLOCK_SIZE,
547 .setkey = des3_192_setkey,
548 .encrypt = cbc_des3_192_encrypt,
549 .decrypt = cbc_des3_192_decrypt,
554 static int des_s390_init(void)
558 if (!crypt_s390_func_available(KM_DEA_ENCRYPT) ||
559 !crypt_s390_func_available(KM_TDEA_128_ENCRYPT) ||
560 !crypt_s390_func_available(KM_TDEA_192_ENCRYPT))
563 ret = crypto_register_alg(&des_alg);
566 ret = crypto_register_alg(&ecb_des_alg);
569 ret = crypto_register_alg(&cbc_des_alg);
573 ret = crypto_register_alg(&des3_128_alg);
576 ret = crypto_register_alg(&ecb_des3_128_alg);
578 goto ecb_des3_128_err;
579 ret = crypto_register_alg(&cbc_des3_128_alg);
581 goto cbc_des3_128_err;
583 ret = crypto_register_alg(&des3_192_alg);
586 ret = crypto_register_alg(&ecb_des3_192_alg);
588 goto ecb_des3_192_err;
589 ret = crypto_register_alg(&cbc_des3_192_alg);
591 goto cbc_des3_192_err;
597 crypto_unregister_alg(&ecb_des3_192_alg);
599 crypto_unregister_alg(&des3_192_alg);
601 crypto_unregister_alg(&cbc_des3_128_alg);
603 crypto_unregister_alg(&ecb_des3_128_alg);
605 crypto_unregister_alg(&des3_128_alg);
607 crypto_unregister_alg(&cbc_des_alg);
609 crypto_unregister_alg(&ecb_des_alg);
611 crypto_unregister_alg(&des_alg);
616 static void __exit des_s390_fini(void)
618 crypto_unregister_alg(&cbc_des3_192_alg);
619 crypto_unregister_alg(&ecb_des3_192_alg);
620 crypto_unregister_alg(&des3_192_alg);
621 crypto_unregister_alg(&cbc_des3_128_alg);
622 crypto_unregister_alg(&ecb_des3_128_alg);
623 crypto_unregister_alg(&des3_128_alg);
624 crypto_unregister_alg(&cbc_des_alg);
625 crypto_unregister_alg(&ecb_des_alg);
626 crypto_unregister_alg(&des_alg);
629 module_init(des_s390_init);
630 module_exit(des_s390_fini);
633 MODULE_ALIAS("des3_ede");
635 MODULE_LICENSE("GPL");
636 MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");