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17#include <linux/init.h>
18#include <linux/module.h>
19#include <linux/crypto.h>
20#include <crypto/algapi.h>
21#include <crypto/des.h>
22
23#include "crypt_s390.h"
24
25#define DES3_KEY_SIZE (3 * DES_KEY_SIZE)
26
27static u8 *ctrblk;
28static DEFINE_SPINLOCK(ctrblk_lock);
29
30struct s390_des_ctx {
31 u8 iv[DES_BLOCK_SIZE];
32 u8 key[DES3_KEY_SIZE];
33};
34
35static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
36 unsigned int key_len)
37{
38 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
39 u32 *flags = &tfm->crt_flags;
40 u32 tmp[DES_EXPKEY_WORDS];
41
42
43 if (!des_ekey(tmp, key) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
44 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
45 return -EINVAL;
46 }
47
48 memcpy(ctx->key, key, key_len);
49 return 0;
50}
51
52static void des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
53{
54 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
55
56 crypt_s390_km(KM_DEA_ENCRYPT, ctx->key, out, in, DES_BLOCK_SIZE);
57}
58
59static void des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
60{
61 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
62
63 crypt_s390_km(KM_DEA_DECRYPT, ctx->key, out, in, DES_BLOCK_SIZE);
64}
65
66static struct crypto_alg des_alg = {
67 .cra_name = "des",
68 .cra_driver_name = "des-s390",
69 .cra_priority = CRYPT_S390_PRIORITY,
70 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
71 .cra_blocksize = DES_BLOCK_SIZE,
72 .cra_ctxsize = sizeof(struct s390_des_ctx),
73 .cra_module = THIS_MODULE,
74 .cra_u = {
75 .cipher = {
76 .cia_min_keysize = DES_KEY_SIZE,
77 .cia_max_keysize = DES_KEY_SIZE,
78 .cia_setkey = des_setkey,
79 .cia_encrypt = des_encrypt,
80 .cia_decrypt = des_decrypt,
81 }
82 }
83};
84
85static int ecb_desall_crypt(struct blkcipher_desc *desc, long func,
86 u8 *key, struct blkcipher_walk *walk)
87{
88 int ret = blkcipher_walk_virt(desc, walk);
89 unsigned int nbytes;
90
91 while ((nbytes = walk->nbytes)) {
92
93 unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
94 u8 *out = walk->dst.virt.addr;
95 u8 *in = walk->src.virt.addr;
96
97 ret = crypt_s390_km(func, key, out, in, n);
98 if (ret < 0 || ret != n)
99 return -EIO;
100
101 nbytes &= DES_BLOCK_SIZE - 1;
102 ret = blkcipher_walk_done(desc, walk, nbytes);
103 }
104
105 return ret;
106}
107
108static int cbc_desall_crypt(struct blkcipher_desc *desc, long func,
109 struct blkcipher_walk *walk)
110{
111 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
112 int ret = blkcipher_walk_virt(desc, walk);
113 unsigned int nbytes = walk->nbytes;
114 struct {
115 u8 iv[DES_BLOCK_SIZE];
116 u8 key[DES3_KEY_SIZE];
117 } param;
118
119 if (!nbytes)
120 goto out;
121
122 memcpy(param.iv, walk->iv, DES_BLOCK_SIZE);
123 memcpy(param.key, ctx->key, DES3_KEY_SIZE);
124 do {
125
126 unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
127 u8 *out = walk->dst.virt.addr;
128 u8 *in = walk->src.virt.addr;
129
130 ret = crypt_s390_kmc(func, ¶m, out, in, n);
131 if (ret < 0 || ret != n)
132 return -EIO;
133
134 nbytes &= DES_BLOCK_SIZE - 1;
135 ret = blkcipher_walk_done(desc, walk, nbytes);
136 } while ((nbytes = walk->nbytes));
137 memcpy(walk->iv, param.iv, DES_BLOCK_SIZE);
138
139out:
140 return ret;
141}
142
143static int ecb_des_encrypt(struct blkcipher_desc *desc,
144 struct scatterlist *dst, struct scatterlist *src,
145 unsigned int nbytes)
146{
147 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
148 struct blkcipher_walk walk;
149
150 blkcipher_walk_init(&walk, dst, src, nbytes);
151 return ecb_desall_crypt(desc, KM_DEA_ENCRYPT, ctx->key, &walk);
152}
153
154static int ecb_des_decrypt(struct blkcipher_desc *desc,
155 struct scatterlist *dst, struct scatterlist *src,
156 unsigned int nbytes)
157{
158 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
159 struct blkcipher_walk walk;
160
161 blkcipher_walk_init(&walk, dst, src, nbytes);
162 return ecb_desall_crypt(desc, KM_DEA_DECRYPT, ctx->key, &walk);
163}
164
165static struct crypto_alg ecb_des_alg = {
166 .cra_name = "ecb(des)",
167 .cra_driver_name = "ecb-des-s390",
168 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
169 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
170 .cra_blocksize = DES_BLOCK_SIZE,
171 .cra_ctxsize = sizeof(struct s390_des_ctx),
172 .cra_type = &crypto_blkcipher_type,
173 .cra_module = THIS_MODULE,
174 .cra_u = {
175 .blkcipher = {
176 .min_keysize = DES_KEY_SIZE,
177 .max_keysize = DES_KEY_SIZE,
178 .setkey = des_setkey,
179 .encrypt = ecb_des_encrypt,
180 .decrypt = ecb_des_decrypt,
181 }
182 }
183};
184
185static int cbc_des_encrypt(struct blkcipher_desc *desc,
186 struct scatterlist *dst, struct scatterlist *src,
187 unsigned int nbytes)
188{
189 struct blkcipher_walk walk;
190
191 blkcipher_walk_init(&walk, dst, src, nbytes);
192 return cbc_desall_crypt(desc, KMC_DEA_ENCRYPT, &walk);
193}
194
195static int cbc_des_decrypt(struct blkcipher_desc *desc,
196 struct scatterlist *dst, struct scatterlist *src,
197 unsigned int nbytes)
198{
199 struct blkcipher_walk walk;
200
201 blkcipher_walk_init(&walk, dst, src, nbytes);
202 return cbc_desall_crypt(desc, KMC_DEA_DECRYPT, &walk);
203}
204
205static struct crypto_alg cbc_des_alg = {
206 .cra_name = "cbc(des)",
207 .cra_driver_name = "cbc-des-s390",
208 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
209 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
210 .cra_blocksize = DES_BLOCK_SIZE,
211 .cra_ctxsize = sizeof(struct s390_des_ctx),
212 .cra_type = &crypto_blkcipher_type,
213 .cra_module = THIS_MODULE,
214 .cra_u = {
215 .blkcipher = {
216 .min_keysize = DES_KEY_SIZE,
217 .max_keysize = DES_KEY_SIZE,
218 .ivsize = DES_BLOCK_SIZE,
219 .setkey = des_setkey,
220 .encrypt = cbc_des_encrypt,
221 .decrypt = cbc_des_decrypt,
222 }
223 }
224};
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238
239static int des3_setkey(struct crypto_tfm *tfm, const u8 *key,
240 unsigned int key_len)
241{
242 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
243 u32 *flags = &tfm->crt_flags;
244
245 if (!(crypto_memneq(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
246 crypto_memneq(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
247 DES_KEY_SIZE)) &&
248 (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
249 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
250 return -EINVAL;
251 }
252 memcpy(ctx->key, key, key_len);
253 return 0;
254}
255
256static void des3_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
257{
258 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
259
260 crypt_s390_km(KM_TDEA_192_ENCRYPT, ctx->key, dst, src, DES_BLOCK_SIZE);
261}
262
263static void des3_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
264{
265 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
266
267 crypt_s390_km(KM_TDEA_192_DECRYPT, ctx->key, dst, src, DES_BLOCK_SIZE);
268}
269
270static struct crypto_alg des3_alg = {
271 .cra_name = "des3_ede",
272 .cra_driver_name = "des3_ede-s390",
273 .cra_priority = CRYPT_S390_PRIORITY,
274 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
275 .cra_blocksize = DES_BLOCK_SIZE,
276 .cra_ctxsize = sizeof(struct s390_des_ctx),
277 .cra_module = THIS_MODULE,
278 .cra_u = {
279 .cipher = {
280 .cia_min_keysize = DES3_KEY_SIZE,
281 .cia_max_keysize = DES3_KEY_SIZE,
282 .cia_setkey = des3_setkey,
283 .cia_encrypt = des3_encrypt,
284 .cia_decrypt = des3_decrypt,
285 }
286 }
287};
288
289static int ecb_des3_encrypt(struct blkcipher_desc *desc,
290 struct scatterlist *dst, struct scatterlist *src,
291 unsigned int nbytes)
292{
293 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
294 struct blkcipher_walk walk;
295
296 blkcipher_walk_init(&walk, dst, src, nbytes);
297 return ecb_desall_crypt(desc, KM_TDEA_192_ENCRYPT, ctx->key, &walk);
298}
299
300static int ecb_des3_decrypt(struct blkcipher_desc *desc,
301 struct scatterlist *dst, struct scatterlist *src,
302 unsigned int nbytes)
303{
304 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
305 struct blkcipher_walk walk;
306
307 blkcipher_walk_init(&walk, dst, src, nbytes);
308 return ecb_desall_crypt(desc, KM_TDEA_192_DECRYPT, ctx->key, &walk);
309}
310
311static struct crypto_alg ecb_des3_alg = {
312 .cra_name = "ecb(des3_ede)",
313 .cra_driver_name = "ecb-des3_ede-s390",
314 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
315 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
316 .cra_blocksize = DES_BLOCK_SIZE,
317 .cra_ctxsize = sizeof(struct s390_des_ctx),
318 .cra_type = &crypto_blkcipher_type,
319 .cra_module = THIS_MODULE,
320 .cra_u = {
321 .blkcipher = {
322 .min_keysize = DES3_KEY_SIZE,
323 .max_keysize = DES3_KEY_SIZE,
324 .setkey = des3_setkey,
325 .encrypt = ecb_des3_encrypt,
326 .decrypt = ecb_des3_decrypt,
327 }
328 }
329};
330
331static int cbc_des3_encrypt(struct blkcipher_desc *desc,
332 struct scatterlist *dst, struct scatterlist *src,
333 unsigned int nbytes)
334{
335 struct blkcipher_walk walk;
336
337 blkcipher_walk_init(&walk, dst, src, nbytes);
338 return cbc_desall_crypt(desc, KMC_TDEA_192_ENCRYPT, &walk);
339}
340
341static int cbc_des3_decrypt(struct blkcipher_desc *desc,
342 struct scatterlist *dst, struct scatterlist *src,
343 unsigned int nbytes)
344{
345 struct blkcipher_walk walk;
346
347 blkcipher_walk_init(&walk, dst, src, nbytes);
348 return cbc_desall_crypt(desc, KMC_TDEA_192_DECRYPT, &walk);
349}
350
351static struct crypto_alg cbc_des3_alg = {
352 .cra_name = "cbc(des3_ede)",
353 .cra_driver_name = "cbc-des3_ede-s390",
354 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
355 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
356 .cra_blocksize = DES_BLOCK_SIZE,
357 .cra_ctxsize = sizeof(struct s390_des_ctx),
358 .cra_type = &crypto_blkcipher_type,
359 .cra_module = THIS_MODULE,
360 .cra_u = {
361 .blkcipher = {
362 .min_keysize = DES3_KEY_SIZE,
363 .max_keysize = DES3_KEY_SIZE,
364 .ivsize = DES_BLOCK_SIZE,
365 .setkey = des3_setkey,
366 .encrypt = cbc_des3_encrypt,
367 .decrypt = cbc_des3_decrypt,
368 }
369 }
370};
371
372static unsigned int __ctrblk_init(u8 *ctrptr, unsigned int nbytes)
373{
374 unsigned int i, n;
375
376
377 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(DES_BLOCK_SIZE - 1);
378 for (i = DES_BLOCK_SIZE; i < n; i += DES_BLOCK_SIZE) {
379 memcpy(ctrptr + i, ctrptr + i - DES_BLOCK_SIZE, DES_BLOCK_SIZE);
380 crypto_inc(ctrptr + i, DES_BLOCK_SIZE);
381 }
382 return n;
383}
384
385static int ctr_desall_crypt(struct blkcipher_desc *desc, long func,
386 struct s390_des_ctx *ctx,
387 struct blkcipher_walk *walk)
388{
389 int ret = blkcipher_walk_virt_block(desc, walk, DES_BLOCK_SIZE);
390 unsigned int n, nbytes;
391 u8 buf[DES_BLOCK_SIZE], ctrbuf[DES_BLOCK_SIZE];
392 u8 *out, *in, *ctrptr = ctrbuf;
393
394 if (!walk->nbytes)
395 return ret;
396
397 if (spin_trylock(&ctrblk_lock))
398 ctrptr = ctrblk;
399
400 memcpy(ctrptr, walk->iv, DES_BLOCK_SIZE);
401 while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
402 out = walk->dst.virt.addr;
403 in = walk->src.virt.addr;
404 while (nbytes >= DES_BLOCK_SIZE) {
405 if (ctrptr == ctrblk)
406 n = __ctrblk_init(ctrptr, nbytes);
407 else
408 n = DES_BLOCK_SIZE;
409 ret = crypt_s390_kmctr(func, ctx->key, out, in,
410 n, ctrptr);
411 if (ret < 0 || ret != n) {
412 if (ctrptr == ctrblk)
413 spin_unlock(&ctrblk_lock);
414 return -EIO;
415 }
416 if (n > DES_BLOCK_SIZE)
417 memcpy(ctrptr, ctrptr + n - DES_BLOCK_SIZE,
418 DES_BLOCK_SIZE);
419 crypto_inc(ctrptr, DES_BLOCK_SIZE);
420 out += n;
421 in += n;
422 nbytes -= n;
423 }
424 ret = blkcipher_walk_done(desc, walk, nbytes);
425 }
426 if (ctrptr == ctrblk) {
427 if (nbytes)
428 memcpy(ctrbuf, ctrptr, DES_BLOCK_SIZE);
429 else
430 memcpy(walk->iv, ctrptr, DES_BLOCK_SIZE);
431 spin_unlock(&ctrblk_lock);
432 } else {
433 if (!nbytes)
434 memcpy(walk->iv, ctrptr, DES_BLOCK_SIZE);
435 }
436
437 if (nbytes) {
438 out = walk->dst.virt.addr;
439 in = walk->src.virt.addr;
440 ret = crypt_s390_kmctr(func, ctx->key, buf, in,
441 DES_BLOCK_SIZE, ctrbuf);
442 if (ret < 0 || ret != DES_BLOCK_SIZE)
443 return -EIO;
444 memcpy(out, buf, nbytes);
445 crypto_inc(ctrbuf, DES_BLOCK_SIZE);
446 ret = blkcipher_walk_done(desc, walk, 0);
447 memcpy(walk->iv, ctrbuf, DES_BLOCK_SIZE);
448 }
449 return ret;
450}
451
452static int ctr_des_encrypt(struct blkcipher_desc *desc,
453 struct scatterlist *dst, struct scatterlist *src,
454 unsigned int nbytes)
455{
456 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
457 struct blkcipher_walk walk;
458
459 blkcipher_walk_init(&walk, dst, src, nbytes);
460 return ctr_desall_crypt(desc, KMCTR_DEA_ENCRYPT, ctx, &walk);
461}
462
463static int ctr_des_decrypt(struct blkcipher_desc *desc,
464 struct scatterlist *dst, struct scatterlist *src,
465 unsigned int nbytes)
466{
467 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
468 struct blkcipher_walk walk;
469
470 blkcipher_walk_init(&walk, dst, src, nbytes);
471 return ctr_desall_crypt(desc, KMCTR_DEA_DECRYPT, ctx, &walk);
472}
473
474static struct crypto_alg ctr_des_alg = {
475 .cra_name = "ctr(des)",
476 .cra_driver_name = "ctr-des-s390",
477 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
478 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
479 .cra_blocksize = 1,
480 .cra_ctxsize = sizeof(struct s390_des_ctx),
481 .cra_type = &crypto_blkcipher_type,
482 .cra_module = THIS_MODULE,
483 .cra_u = {
484 .blkcipher = {
485 .min_keysize = DES_KEY_SIZE,
486 .max_keysize = DES_KEY_SIZE,
487 .ivsize = DES_BLOCK_SIZE,
488 .setkey = des_setkey,
489 .encrypt = ctr_des_encrypt,
490 .decrypt = ctr_des_decrypt,
491 }
492 }
493};
494
495static int ctr_des3_encrypt(struct blkcipher_desc *desc,
496 struct scatterlist *dst, struct scatterlist *src,
497 unsigned int nbytes)
498{
499 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
500 struct blkcipher_walk walk;
501
502 blkcipher_walk_init(&walk, dst, src, nbytes);
503 return ctr_desall_crypt(desc, KMCTR_TDEA_192_ENCRYPT, ctx, &walk);
504}
505
506static int ctr_des3_decrypt(struct blkcipher_desc *desc,
507 struct scatterlist *dst, struct scatterlist *src,
508 unsigned int nbytes)
509{
510 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
511 struct blkcipher_walk walk;
512
513 blkcipher_walk_init(&walk, dst, src, nbytes);
514 return ctr_desall_crypt(desc, KMCTR_TDEA_192_DECRYPT, ctx, &walk);
515}
516
517static struct crypto_alg ctr_des3_alg = {
518 .cra_name = "ctr(des3_ede)",
519 .cra_driver_name = "ctr-des3_ede-s390",
520 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
521 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
522 .cra_blocksize = 1,
523 .cra_ctxsize = sizeof(struct s390_des_ctx),
524 .cra_type = &crypto_blkcipher_type,
525 .cra_module = THIS_MODULE,
526 .cra_u = {
527 .blkcipher = {
528 .min_keysize = DES3_KEY_SIZE,
529 .max_keysize = DES3_KEY_SIZE,
530 .ivsize = DES_BLOCK_SIZE,
531 .setkey = des3_setkey,
532 .encrypt = ctr_des3_encrypt,
533 .decrypt = ctr_des3_decrypt,
534 }
535 }
536};
537
538static int __init des_s390_init(void)
539{
540 int ret;
541
542 if (!crypt_s390_func_available(KM_DEA_ENCRYPT, CRYPT_S390_MSA) ||
543 !crypt_s390_func_available(KM_TDEA_192_ENCRYPT, CRYPT_S390_MSA))
544 return -EOPNOTSUPP;
545
546 ret = crypto_register_alg(&des_alg);
547 if (ret)
548 goto des_err;
549 ret = crypto_register_alg(&ecb_des_alg);
550 if (ret)
551 goto ecb_des_err;
552 ret = crypto_register_alg(&cbc_des_alg);
553 if (ret)
554 goto cbc_des_err;
555 ret = crypto_register_alg(&des3_alg);
556 if (ret)
557 goto des3_err;
558 ret = crypto_register_alg(&ecb_des3_alg);
559 if (ret)
560 goto ecb_des3_err;
561 ret = crypto_register_alg(&cbc_des3_alg);
562 if (ret)
563 goto cbc_des3_err;
564
565 if (crypt_s390_func_available(KMCTR_DEA_ENCRYPT,
566 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
567 crypt_s390_func_available(KMCTR_TDEA_192_ENCRYPT,
568 CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
569 ret = crypto_register_alg(&ctr_des_alg);
570 if (ret)
571 goto ctr_des_err;
572 ret = crypto_register_alg(&ctr_des3_alg);
573 if (ret)
574 goto ctr_des3_err;
575 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
576 if (!ctrblk) {
577 ret = -ENOMEM;
578 goto ctr_mem_err;
579 }
580 }
581out:
582 return ret;
583
584ctr_mem_err:
585 crypto_unregister_alg(&ctr_des3_alg);
586ctr_des3_err:
587 crypto_unregister_alg(&ctr_des_alg);
588ctr_des_err:
589 crypto_unregister_alg(&cbc_des3_alg);
590cbc_des3_err:
591 crypto_unregister_alg(&ecb_des3_alg);
592ecb_des3_err:
593 crypto_unregister_alg(&des3_alg);
594des3_err:
595 crypto_unregister_alg(&cbc_des_alg);
596cbc_des_err:
597 crypto_unregister_alg(&ecb_des_alg);
598ecb_des_err:
599 crypto_unregister_alg(&des_alg);
600des_err:
601 goto out;
602}
603
604static void __exit des_s390_exit(void)
605{
606 if (ctrblk) {
607 crypto_unregister_alg(&ctr_des_alg);
608 crypto_unregister_alg(&ctr_des3_alg);
609 free_page((unsigned long) ctrblk);
610 }
611 crypto_unregister_alg(&cbc_des3_alg);
612 crypto_unregister_alg(&ecb_des3_alg);
613 crypto_unregister_alg(&des3_alg);
614 crypto_unregister_alg(&cbc_des_alg);
615 crypto_unregister_alg(&ecb_des_alg);
616 crypto_unregister_alg(&des_alg);
617}
618
619module_init(des_s390_init);
620module_exit(des_s390_exit);
621
622MODULE_ALIAS_CRYPTO("des");
623MODULE_ALIAS_CRYPTO("des3_ede");
624
625MODULE_LICENSE("GPL");
626MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
627
