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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Cryptographic API.
4 *
5 * s390 implementation of the DES Cipher Algorithm.
6 *
7 * Copyright IBM Corp. 2003, 2011
8 * Author(s): Thomas Spatzier
9 * Jan Glauber (jan.glauber@de.ibm.com)
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/cpufeature.h>
15#include <linux/crypto.h>
16#include <linux/fips.h>
17#include <linux/mutex.h>
18#include <crypto/algapi.h>
19#include <crypto/internal/des.h>
20#include <crypto/internal/skcipher.h>
21#include <asm/cpacf.h>
22
23#define DES3_KEY_SIZE (3 * DES_KEY_SIZE)
24
25static u8 *ctrblk;
26static DEFINE_MUTEX(ctrblk_lock);
27
28static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
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 int err;
40
41 err = crypto_des_verify_key(tfm, key);
42 if (err)
43 return err;
44
45 memcpy(ctx->key, key, key_len);
46 return 0;
47}
48
49static int des_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
50 unsigned int key_len)
51{
52 return des_setkey(crypto_skcipher_tfm(tfm), key, key_len);
53}
54
55static void s390_des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
56{
57 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
58
59 cpacf_km(CPACF_KM_DEA, ctx->key, out, in, DES_BLOCK_SIZE);
60}
61
62static void s390_des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
63{
64 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
65
66 cpacf_km(CPACF_KM_DEA | CPACF_DECRYPT,
67 ctx->key, out, in, DES_BLOCK_SIZE);
68}
69
70static struct crypto_alg des_alg = {
71 .cra_name = "des",
72 .cra_driver_name = "des-s390",
73 .cra_priority = 300,
74 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
75 .cra_blocksize = DES_BLOCK_SIZE,
76 .cra_ctxsize = sizeof(struct s390_des_ctx),
77 .cra_module = THIS_MODULE,
78 .cra_u = {
79 .cipher = {
80 .cia_min_keysize = DES_KEY_SIZE,
81 .cia_max_keysize = DES_KEY_SIZE,
82 .cia_setkey = des_setkey,
83 .cia_encrypt = s390_des_encrypt,
84 .cia_decrypt = s390_des_decrypt,
85 }
86 }
87};
88
89static int ecb_desall_crypt(struct skcipher_request *req, unsigned long fc)
90{
91 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
92 struct s390_des_ctx *ctx = crypto_skcipher_ctx(tfm);
93 struct skcipher_walk walk;
94 unsigned int nbytes, n;
95 int ret;
96
97 ret = skcipher_walk_virt(&walk, req, false);
98 while ((nbytes = walk.nbytes) != 0) {
99 /* only use complete blocks */
100 n = nbytes & ~(DES_BLOCK_SIZE - 1);
101 cpacf_km(fc, ctx->key, walk.dst.virt.addr,
102 walk.src.virt.addr, n);
103 ret = skcipher_walk_done(&walk, nbytes - n);
104 }
105 return ret;
106}
107
108static int cbc_desall_crypt(struct skcipher_request *req, unsigned long fc)
109{
110 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
111 struct s390_des_ctx *ctx = crypto_skcipher_ctx(tfm);
112 struct skcipher_walk walk;
113 unsigned int nbytes, n;
114 int ret;
115 struct {
116 u8 iv[DES_BLOCK_SIZE];
117 u8 key[DES3_KEY_SIZE];
118 } param;
119
120 ret = skcipher_walk_virt(&walk, req, false);
121 if (ret)
122 return ret;
123 memcpy(param.iv, walk.iv, DES_BLOCK_SIZE);
124 memcpy(param.key, ctx->key, DES3_KEY_SIZE);
125 while ((nbytes = walk.nbytes) != 0) {
126 /* only use complete blocks */
127 n = nbytes & ~(DES_BLOCK_SIZE - 1);
128 cpacf_kmc(fc, ¶m, walk.dst.virt.addr,
129 walk.src.virt.addr, n);
130 memcpy(walk.iv, param.iv, DES_BLOCK_SIZE);
131 ret = skcipher_walk_done(&walk, nbytes - n);
132 }
133 return ret;
134}
135
136static int ecb_des_encrypt(struct skcipher_request *req)
137{
138 return ecb_desall_crypt(req, CPACF_KM_DEA);
139}
140
141static int ecb_des_decrypt(struct skcipher_request *req)
142{
143 return ecb_desall_crypt(req, CPACF_KM_DEA | CPACF_DECRYPT);
144}
145
146static struct skcipher_alg ecb_des_alg = {
147 .base.cra_name = "ecb(des)",
148 .base.cra_driver_name = "ecb-des-s390",
149 .base.cra_priority = 400, /* combo: des + ecb */
150 .base.cra_blocksize = DES_BLOCK_SIZE,
151 .base.cra_ctxsize = sizeof(struct s390_des_ctx),
152 .base.cra_module = THIS_MODULE,
153 .min_keysize = DES_KEY_SIZE,
154 .max_keysize = DES_KEY_SIZE,
155 .setkey = des_setkey_skcipher,
156 .encrypt = ecb_des_encrypt,
157 .decrypt = ecb_des_decrypt,
158};
159
160static int cbc_des_encrypt(struct skcipher_request *req)
161{
162 return cbc_desall_crypt(req, CPACF_KMC_DEA);
163}
164
165static int cbc_des_decrypt(struct skcipher_request *req)
166{
167 return cbc_desall_crypt(req, CPACF_KMC_DEA | CPACF_DECRYPT);
168}
169
170static struct skcipher_alg cbc_des_alg = {
171 .base.cra_name = "cbc(des)",
172 .base.cra_driver_name = "cbc-des-s390",
173 .base.cra_priority = 400, /* combo: des + cbc */
174 .base.cra_blocksize = DES_BLOCK_SIZE,
175 .base.cra_ctxsize = sizeof(struct s390_des_ctx),
176 .base.cra_module = THIS_MODULE,
177 .min_keysize = DES_KEY_SIZE,
178 .max_keysize = DES_KEY_SIZE,
179 .ivsize = DES_BLOCK_SIZE,
180 .setkey = des_setkey_skcipher,
181 .encrypt = cbc_des_encrypt,
182 .decrypt = cbc_des_decrypt,
183};
184
185/*
186 * RFC2451:
187 *
188 * For DES-EDE3, there is no known need to reject weak or
189 * complementation keys. Any weakness is obviated by the use of
190 * multiple keys.
191 *
192 * However, if the first two or last two independent 64-bit keys are
193 * equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
194 * same as DES. Implementers MUST reject keys that exhibit this
195 * property.
196 *
197 * In fips mode additionally check for all 3 keys are unique.
198 *
199 */
200static int des3_setkey(struct crypto_tfm *tfm, const u8 *key,
201 unsigned int key_len)
202{
203 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
204 int err;
205
206 err = crypto_des3_ede_verify_key(tfm, key);
207 if (err)
208 return err;
209
210 memcpy(ctx->key, key, key_len);
211 return 0;
212}
213
214static int des3_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
215 unsigned int key_len)
216{
217 return des3_setkey(crypto_skcipher_tfm(tfm), key, key_len);
218}
219
220static void des3_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
221{
222 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
223
224 cpacf_km(CPACF_KM_TDEA_192, ctx->key, dst, src, DES_BLOCK_SIZE);
225}
226
227static void des3_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
228{
229 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
230
231 cpacf_km(CPACF_KM_TDEA_192 | CPACF_DECRYPT,
232 ctx->key, dst, src, DES_BLOCK_SIZE);
233}
234
235static struct crypto_alg des3_alg = {
236 .cra_name = "des3_ede",
237 .cra_driver_name = "des3_ede-s390",
238 .cra_priority = 300,
239 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
240 .cra_blocksize = DES_BLOCK_SIZE,
241 .cra_ctxsize = sizeof(struct s390_des_ctx),
242 .cra_module = THIS_MODULE,
243 .cra_u = {
244 .cipher = {
245 .cia_min_keysize = DES3_KEY_SIZE,
246 .cia_max_keysize = DES3_KEY_SIZE,
247 .cia_setkey = des3_setkey,
248 .cia_encrypt = des3_encrypt,
249 .cia_decrypt = des3_decrypt,
250 }
251 }
252};
253
254static int ecb_des3_encrypt(struct skcipher_request *req)
255{
256 return ecb_desall_crypt(req, CPACF_KM_TDEA_192);
257}
258
259static int ecb_des3_decrypt(struct skcipher_request *req)
260{
261 return ecb_desall_crypt(req, CPACF_KM_TDEA_192 | CPACF_DECRYPT);
262}
263
264static struct skcipher_alg ecb_des3_alg = {
265 .base.cra_name = "ecb(des3_ede)",
266 .base.cra_driver_name = "ecb-des3_ede-s390",
267 .base.cra_priority = 400, /* combo: des3 + ecb */
268 .base.cra_blocksize = DES_BLOCK_SIZE,
269 .base.cra_ctxsize = sizeof(struct s390_des_ctx),
270 .base.cra_module = THIS_MODULE,
271 .min_keysize = DES3_KEY_SIZE,
272 .max_keysize = DES3_KEY_SIZE,
273 .setkey = des3_setkey_skcipher,
274 .encrypt = ecb_des3_encrypt,
275 .decrypt = ecb_des3_decrypt,
276};
277
278static int cbc_des3_encrypt(struct skcipher_request *req)
279{
280 return cbc_desall_crypt(req, CPACF_KMC_TDEA_192);
281}
282
283static int cbc_des3_decrypt(struct skcipher_request *req)
284{
285 return cbc_desall_crypt(req, CPACF_KMC_TDEA_192 | CPACF_DECRYPT);
286}
287
288static struct skcipher_alg cbc_des3_alg = {
289 .base.cra_name = "cbc(des3_ede)",
290 .base.cra_driver_name = "cbc-des3_ede-s390",
291 .base.cra_priority = 400, /* combo: des3 + cbc */
292 .base.cra_blocksize = DES_BLOCK_SIZE,
293 .base.cra_ctxsize = sizeof(struct s390_des_ctx),
294 .base.cra_module = THIS_MODULE,
295 .min_keysize = DES3_KEY_SIZE,
296 .max_keysize = DES3_KEY_SIZE,
297 .ivsize = DES_BLOCK_SIZE,
298 .setkey = des3_setkey_skcipher,
299 .encrypt = cbc_des3_encrypt,
300 .decrypt = cbc_des3_decrypt,
301};
302
303static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
304{
305 unsigned int i, n;
306
307 /* align to block size, max. PAGE_SIZE */
308 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(DES_BLOCK_SIZE - 1);
309 memcpy(ctrptr, iv, DES_BLOCK_SIZE);
310 for (i = (n / DES_BLOCK_SIZE) - 1; i > 0; i--) {
311 memcpy(ctrptr + DES_BLOCK_SIZE, ctrptr, DES_BLOCK_SIZE);
312 crypto_inc(ctrptr + DES_BLOCK_SIZE, DES_BLOCK_SIZE);
313 ctrptr += DES_BLOCK_SIZE;
314 }
315 return n;
316}
317
318static int ctr_desall_crypt(struct skcipher_request *req, unsigned long fc)
319{
320 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
321 struct s390_des_ctx *ctx = crypto_skcipher_ctx(tfm);
322 u8 buf[DES_BLOCK_SIZE], *ctrptr;
323 struct skcipher_walk walk;
324 unsigned int n, nbytes;
325 int ret, locked;
326
327 locked = mutex_trylock(&ctrblk_lock);
328
329 ret = skcipher_walk_virt(&walk, req, false);
330 while ((nbytes = walk.nbytes) >= DES_BLOCK_SIZE) {
331 n = DES_BLOCK_SIZE;
332 if (nbytes >= 2*DES_BLOCK_SIZE && locked)
333 n = __ctrblk_init(ctrblk, walk.iv, nbytes);
334 ctrptr = (n > DES_BLOCK_SIZE) ? ctrblk : walk.iv;
335 cpacf_kmctr(fc, ctx->key, walk.dst.virt.addr,
336 walk.src.virt.addr, n, ctrptr);
337 if (ctrptr == ctrblk)
338 memcpy(walk.iv, ctrptr + n - DES_BLOCK_SIZE,
339 DES_BLOCK_SIZE);
340 crypto_inc(walk.iv, DES_BLOCK_SIZE);
341 ret = skcipher_walk_done(&walk, nbytes - n);
342 }
343 if (locked)
344 mutex_unlock(&ctrblk_lock);
345 /* final block may be < DES_BLOCK_SIZE, copy only nbytes */
346 if (nbytes) {
347 cpacf_kmctr(fc, ctx->key, buf, walk.src.virt.addr,
348 DES_BLOCK_SIZE, walk.iv);
349 memcpy(walk.dst.virt.addr, buf, nbytes);
350 crypto_inc(walk.iv, DES_BLOCK_SIZE);
351 ret = skcipher_walk_done(&walk, 0);
352 }
353 return ret;
354}
355
356static int ctr_des_crypt(struct skcipher_request *req)
357{
358 return ctr_desall_crypt(req, CPACF_KMCTR_DEA);
359}
360
361static struct skcipher_alg ctr_des_alg = {
362 .base.cra_name = "ctr(des)",
363 .base.cra_driver_name = "ctr-des-s390",
364 .base.cra_priority = 400, /* combo: des + ctr */
365 .base.cra_blocksize = 1,
366 .base.cra_ctxsize = sizeof(struct s390_des_ctx),
367 .base.cra_module = THIS_MODULE,
368 .min_keysize = DES_KEY_SIZE,
369 .max_keysize = DES_KEY_SIZE,
370 .ivsize = DES_BLOCK_SIZE,
371 .setkey = des_setkey_skcipher,
372 .encrypt = ctr_des_crypt,
373 .decrypt = ctr_des_crypt,
374 .chunksize = DES_BLOCK_SIZE,
375};
376
377static int ctr_des3_crypt(struct skcipher_request *req)
378{
379 return ctr_desall_crypt(req, CPACF_KMCTR_TDEA_192);
380}
381
382static struct skcipher_alg ctr_des3_alg = {
383 .base.cra_name = "ctr(des3_ede)",
384 .base.cra_driver_name = "ctr-des3_ede-s390",
385 .base.cra_priority = 400, /* combo: des3 + ede */
386 .base.cra_blocksize = 1,
387 .base.cra_ctxsize = sizeof(struct s390_des_ctx),
388 .base.cra_module = THIS_MODULE,
389 .min_keysize = DES3_KEY_SIZE,
390 .max_keysize = DES3_KEY_SIZE,
391 .ivsize = DES_BLOCK_SIZE,
392 .setkey = des3_setkey_skcipher,
393 .encrypt = ctr_des3_crypt,
394 .decrypt = ctr_des3_crypt,
395 .chunksize = DES_BLOCK_SIZE,
396};
397
398static struct crypto_alg *des_s390_algs_ptr[2];
399static int des_s390_algs_num;
400static struct skcipher_alg *des_s390_skciphers_ptr[6];
401static int des_s390_skciphers_num;
402
403static int des_s390_register_alg(struct crypto_alg *alg)
404{
405 int ret;
406
407 ret = crypto_register_alg(alg);
408 if (!ret)
409 des_s390_algs_ptr[des_s390_algs_num++] = alg;
410 return ret;
411}
412
413static int des_s390_register_skcipher(struct skcipher_alg *alg)
414{
415 int ret;
416
417 ret = crypto_register_skcipher(alg);
418 if (!ret)
419 des_s390_skciphers_ptr[des_s390_skciphers_num++] = alg;
420 return ret;
421}
422
423static void des_s390_exit(void)
424{
425 while (des_s390_algs_num--)
426 crypto_unregister_alg(des_s390_algs_ptr[des_s390_algs_num]);
427 while (des_s390_skciphers_num--)
428 crypto_unregister_skcipher(des_s390_skciphers_ptr[des_s390_skciphers_num]);
429 if (ctrblk)
430 free_page((unsigned long) ctrblk);
431}
432
433static int __init des_s390_init(void)
434{
435 int ret;
436
437 /* Query available functions for KM, KMC and KMCTR */
438 cpacf_query(CPACF_KM, &km_functions);
439 cpacf_query(CPACF_KMC, &kmc_functions);
440 cpacf_query(CPACF_KMCTR, &kmctr_functions);
441
442 if (cpacf_test_func(&km_functions, CPACF_KM_DEA)) {
443 ret = des_s390_register_alg(&des_alg);
444 if (ret)
445 goto out_err;
446 ret = des_s390_register_skcipher(&ecb_des_alg);
447 if (ret)
448 goto out_err;
449 }
450 if (cpacf_test_func(&kmc_functions, CPACF_KMC_DEA)) {
451 ret = des_s390_register_skcipher(&cbc_des_alg);
452 if (ret)
453 goto out_err;
454 }
455 if (cpacf_test_func(&km_functions, CPACF_KM_TDEA_192)) {
456 ret = des_s390_register_alg(&des3_alg);
457 if (ret)
458 goto out_err;
459 ret = des_s390_register_skcipher(&ecb_des3_alg);
460 if (ret)
461 goto out_err;
462 }
463 if (cpacf_test_func(&kmc_functions, CPACF_KMC_TDEA_192)) {
464 ret = des_s390_register_skcipher(&cbc_des3_alg);
465 if (ret)
466 goto out_err;
467 }
468
469 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_DEA) ||
470 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_TDEA_192)) {
471 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
472 if (!ctrblk) {
473 ret = -ENOMEM;
474 goto out_err;
475 }
476 }
477
478 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_DEA)) {
479 ret = des_s390_register_skcipher(&ctr_des_alg);
480 if (ret)
481 goto out_err;
482 }
483 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_TDEA_192)) {
484 ret = des_s390_register_skcipher(&ctr_des3_alg);
485 if (ret)
486 goto out_err;
487 }
488
489 return 0;
490out_err:
491 des_s390_exit();
492 return ret;
493}
494
495module_cpu_feature_match(S390_CPU_FEATURE_MSA, des_s390_init);
496module_exit(des_s390_exit);
497
498MODULE_ALIAS_CRYPTO("des");
499MODULE_ALIAS_CRYPTO("des3_ede");
500
501MODULE_LICENSE("GPL");
502MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
1/*
2 * Cryptographic API.
3 *
4 * s390 implementation of the DES Cipher Algorithm.
5 *
6 * Copyright IBM Corp. 2003,2011
7 * Author(s): Thomas Spatzier
8 * Jan Glauber (jan.glauber@de.ibm.com)
9 *
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.
14 *
15 */
16
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;
28
29struct s390_des_ctx {
30 u8 iv[DES_BLOCK_SIZE];
31 u8 key[DES3_KEY_SIZE];
32};
33
34static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
35 unsigned int key_len)
36{
37 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
38 u32 *flags = &tfm->crt_flags;
39 u32 tmp[DES_EXPKEY_WORDS];
40
41 /* check for weak keys */
42 if (!des_ekey(tmp, key) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
43 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
44 return -EINVAL;
45 }
46
47 memcpy(ctx->key, key, key_len);
48 return 0;
49}
50
51static void des_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
52{
53 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
54
55 crypt_s390_km(KM_DEA_ENCRYPT, ctx->key, out, in, DES_BLOCK_SIZE);
56}
57
58static void des_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
59{
60 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
61
62 crypt_s390_km(KM_DEA_DECRYPT, ctx->key, out, in, DES_BLOCK_SIZE);
63}
64
65static struct crypto_alg des_alg = {
66 .cra_name = "des",
67 .cra_driver_name = "des-s390",
68 .cra_priority = CRYPT_S390_PRIORITY,
69 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
70 .cra_blocksize = DES_BLOCK_SIZE,
71 .cra_ctxsize = sizeof(struct s390_des_ctx),
72 .cra_module = THIS_MODULE,
73 .cra_list = LIST_HEAD_INIT(des_alg.cra_list),
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 /* only use complete blocks */
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 BUG_ON((ret < 0) || (ret != n));
99
100 nbytes &= DES_BLOCK_SIZE - 1;
101 ret = blkcipher_walk_done(desc, walk, nbytes);
102 }
103
104 return ret;
105}
106
107static int cbc_desall_crypt(struct blkcipher_desc *desc, long func,
108 u8 *iv, struct blkcipher_walk *walk)
109{
110 int ret = blkcipher_walk_virt(desc, walk);
111 unsigned int nbytes = walk->nbytes;
112
113 if (!nbytes)
114 goto out;
115
116 memcpy(iv, walk->iv, DES_BLOCK_SIZE);
117 do {
118 /* only use complete blocks */
119 unsigned int n = nbytes & ~(DES_BLOCK_SIZE - 1);
120 u8 *out = walk->dst.virt.addr;
121 u8 *in = walk->src.virt.addr;
122
123 ret = crypt_s390_kmc(func, iv, out, in, n);
124 BUG_ON((ret < 0) || (ret != n));
125
126 nbytes &= DES_BLOCK_SIZE - 1;
127 ret = blkcipher_walk_done(desc, walk, nbytes);
128 } while ((nbytes = walk->nbytes));
129 memcpy(walk->iv, iv, DES_BLOCK_SIZE);
130
131out:
132 return ret;
133}
134
135static int ecb_des_encrypt(struct blkcipher_desc *desc,
136 struct scatterlist *dst, struct scatterlist *src,
137 unsigned int nbytes)
138{
139 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
140 struct blkcipher_walk walk;
141
142 blkcipher_walk_init(&walk, dst, src, nbytes);
143 return ecb_desall_crypt(desc, KM_DEA_ENCRYPT, ctx->key, &walk);
144}
145
146static int ecb_des_decrypt(struct blkcipher_desc *desc,
147 struct scatterlist *dst, struct scatterlist *src,
148 unsigned int nbytes)
149{
150 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
151 struct blkcipher_walk walk;
152
153 blkcipher_walk_init(&walk, dst, src, nbytes);
154 return ecb_desall_crypt(desc, KM_DEA_DECRYPT, ctx->key, &walk);
155}
156
157static struct crypto_alg ecb_des_alg = {
158 .cra_name = "ecb(des)",
159 .cra_driver_name = "ecb-des-s390",
160 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
161 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
162 .cra_blocksize = DES_BLOCK_SIZE,
163 .cra_ctxsize = sizeof(struct s390_des_ctx),
164 .cra_type = &crypto_blkcipher_type,
165 .cra_module = THIS_MODULE,
166 .cra_list = LIST_HEAD_INIT(ecb_des_alg.cra_list),
167 .cra_u = {
168 .blkcipher = {
169 .min_keysize = DES_KEY_SIZE,
170 .max_keysize = DES_KEY_SIZE,
171 .setkey = des_setkey,
172 .encrypt = ecb_des_encrypt,
173 .decrypt = ecb_des_decrypt,
174 }
175 }
176};
177
178static int cbc_des_encrypt(struct blkcipher_desc *desc,
179 struct scatterlist *dst, struct scatterlist *src,
180 unsigned int nbytes)
181{
182 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
183 struct blkcipher_walk walk;
184
185 blkcipher_walk_init(&walk, dst, src, nbytes);
186 return cbc_desall_crypt(desc, KMC_DEA_ENCRYPT, ctx->iv, &walk);
187}
188
189static int cbc_des_decrypt(struct blkcipher_desc *desc,
190 struct scatterlist *dst, struct scatterlist *src,
191 unsigned int nbytes)
192{
193 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
194 struct blkcipher_walk walk;
195
196 blkcipher_walk_init(&walk, dst, src, nbytes);
197 return cbc_desall_crypt(desc, KMC_DEA_DECRYPT, ctx->iv, &walk);
198}
199
200static struct crypto_alg cbc_des_alg = {
201 .cra_name = "cbc(des)",
202 .cra_driver_name = "cbc-des-s390",
203 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
204 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
205 .cra_blocksize = DES_BLOCK_SIZE,
206 .cra_ctxsize = sizeof(struct s390_des_ctx),
207 .cra_type = &crypto_blkcipher_type,
208 .cra_module = THIS_MODULE,
209 .cra_list = LIST_HEAD_INIT(cbc_des_alg.cra_list),
210 .cra_u = {
211 .blkcipher = {
212 .min_keysize = DES_KEY_SIZE,
213 .max_keysize = DES_KEY_SIZE,
214 .ivsize = DES_BLOCK_SIZE,
215 .setkey = des_setkey,
216 .encrypt = cbc_des_encrypt,
217 .decrypt = cbc_des_decrypt,
218 }
219 }
220};
221
222/*
223 * RFC2451:
224 *
225 * For DES-EDE3, there is no known need to reject weak or
226 * complementation keys. Any weakness is obviated by the use of
227 * multiple keys.
228 *
229 * However, if the first two or last two independent 64-bit keys are
230 * equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
231 * same as DES. Implementers MUST reject keys that exhibit this
232 * property.
233 *
234 */
235static int des3_setkey(struct crypto_tfm *tfm, const u8 *key,
236 unsigned int key_len)
237{
238 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
239 u32 *flags = &tfm->crt_flags;
240
241 if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
242 memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
243 DES_KEY_SIZE)) &&
244 (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
245 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
246 return -EINVAL;
247 }
248 memcpy(ctx->key, key, key_len);
249 return 0;
250}
251
252static void des3_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
253{
254 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
255
256 crypt_s390_km(KM_TDEA_192_ENCRYPT, ctx->key, dst, src, DES_BLOCK_SIZE);
257}
258
259static void des3_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
260{
261 struct s390_des_ctx *ctx = crypto_tfm_ctx(tfm);
262
263 crypt_s390_km(KM_TDEA_192_DECRYPT, ctx->key, dst, src, DES_BLOCK_SIZE);
264}
265
266static struct crypto_alg des3_alg = {
267 .cra_name = "des3_ede",
268 .cra_driver_name = "des3_ede-s390",
269 .cra_priority = CRYPT_S390_PRIORITY,
270 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
271 .cra_blocksize = DES_BLOCK_SIZE,
272 .cra_ctxsize = sizeof(struct s390_des_ctx),
273 .cra_module = THIS_MODULE,
274 .cra_list = LIST_HEAD_INIT(des3_alg.cra_list),
275 .cra_u = {
276 .cipher = {
277 .cia_min_keysize = DES3_KEY_SIZE,
278 .cia_max_keysize = DES3_KEY_SIZE,
279 .cia_setkey = des3_setkey,
280 .cia_encrypt = des3_encrypt,
281 .cia_decrypt = des3_decrypt,
282 }
283 }
284};
285
286static int ecb_des3_encrypt(struct blkcipher_desc *desc,
287 struct scatterlist *dst, struct scatterlist *src,
288 unsigned int nbytes)
289{
290 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
291 struct blkcipher_walk walk;
292
293 blkcipher_walk_init(&walk, dst, src, nbytes);
294 return ecb_desall_crypt(desc, KM_TDEA_192_ENCRYPT, ctx->key, &walk);
295}
296
297static int ecb_des3_decrypt(struct blkcipher_desc *desc,
298 struct scatterlist *dst, struct scatterlist *src,
299 unsigned int nbytes)
300{
301 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
302 struct blkcipher_walk walk;
303
304 blkcipher_walk_init(&walk, dst, src, nbytes);
305 return ecb_desall_crypt(desc, KM_TDEA_192_DECRYPT, ctx->key, &walk);
306}
307
308static struct crypto_alg ecb_des3_alg = {
309 .cra_name = "ecb(des3_ede)",
310 .cra_driver_name = "ecb-des3_ede-s390",
311 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
312 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
313 .cra_blocksize = DES_BLOCK_SIZE,
314 .cra_ctxsize = sizeof(struct s390_des_ctx),
315 .cra_type = &crypto_blkcipher_type,
316 .cra_module = THIS_MODULE,
317 .cra_list = LIST_HEAD_INIT(
318 ecb_des3_alg.cra_list),
319 .cra_u = {
320 .blkcipher = {
321 .min_keysize = DES3_KEY_SIZE,
322 .max_keysize = DES3_KEY_SIZE,
323 .setkey = des3_setkey,
324 .encrypt = ecb_des3_encrypt,
325 .decrypt = ecb_des3_decrypt,
326 }
327 }
328};
329
330static int cbc_des3_encrypt(struct blkcipher_desc *desc,
331 struct scatterlist *dst, struct scatterlist *src,
332 unsigned int nbytes)
333{
334 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
335 struct blkcipher_walk walk;
336
337 blkcipher_walk_init(&walk, dst, src, nbytes);
338 return cbc_desall_crypt(desc, KMC_TDEA_192_ENCRYPT, ctx->iv, &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 s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
346 struct blkcipher_walk walk;
347
348 blkcipher_walk_init(&walk, dst, src, nbytes);
349 return cbc_desall_crypt(desc, KMC_TDEA_192_DECRYPT, ctx->iv, &walk);
350}
351
352static struct crypto_alg cbc_des3_alg = {
353 .cra_name = "cbc(des3_ede)",
354 .cra_driver_name = "cbc-des3_ede-s390",
355 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
356 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
357 .cra_blocksize = DES_BLOCK_SIZE,
358 .cra_ctxsize = sizeof(struct s390_des_ctx),
359 .cra_type = &crypto_blkcipher_type,
360 .cra_module = THIS_MODULE,
361 .cra_list = LIST_HEAD_INIT(
362 cbc_des3_alg.cra_list),
363 .cra_u = {
364 .blkcipher = {
365 .min_keysize = DES3_KEY_SIZE,
366 .max_keysize = DES3_KEY_SIZE,
367 .ivsize = DES_BLOCK_SIZE,
368 .setkey = des3_setkey,
369 .encrypt = cbc_des3_encrypt,
370 .decrypt = cbc_des3_decrypt,
371 }
372 }
373};
374
375static int ctr_desall_crypt(struct blkcipher_desc *desc, long func,
376 struct s390_des_ctx *ctx, struct blkcipher_walk *walk)
377{
378 int ret = blkcipher_walk_virt_block(desc, walk, DES_BLOCK_SIZE);
379 unsigned int i, n, nbytes;
380 u8 buf[DES_BLOCK_SIZE];
381 u8 *out, *in;
382
383 memcpy(ctrblk, walk->iv, DES_BLOCK_SIZE);
384 while ((nbytes = walk->nbytes) >= DES_BLOCK_SIZE) {
385 out = walk->dst.virt.addr;
386 in = walk->src.virt.addr;
387 while (nbytes >= DES_BLOCK_SIZE) {
388 /* align to block size, max. PAGE_SIZE */
389 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE :
390 nbytes & ~(DES_BLOCK_SIZE - 1);
391 for (i = DES_BLOCK_SIZE; i < n; i += DES_BLOCK_SIZE) {
392 memcpy(ctrblk + i, ctrblk + i - DES_BLOCK_SIZE,
393 DES_BLOCK_SIZE);
394 crypto_inc(ctrblk + i, DES_BLOCK_SIZE);
395 }
396 ret = crypt_s390_kmctr(func, ctx->key, out, in, n, ctrblk);
397 BUG_ON((ret < 0) || (ret != n));
398 if (n > DES_BLOCK_SIZE)
399 memcpy(ctrblk, ctrblk + n - DES_BLOCK_SIZE,
400 DES_BLOCK_SIZE);
401 crypto_inc(ctrblk, DES_BLOCK_SIZE);
402 out += n;
403 in += n;
404 nbytes -= n;
405 }
406 ret = blkcipher_walk_done(desc, walk, nbytes);
407 }
408
409 /* final block may be < DES_BLOCK_SIZE, copy only nbytes */
410 if (nbytes) {
411 out = walk->dst.virt.addr;
412 in = walk->src.virt.addr;
413 ret = crypt_s390_kmctr(func, ctx->key, buf, in,
414 DES_BLOCK_SIZE, ctrblk);
415 BUG_ON(ret < 0 || ret != DES_BLOCK_SIZE);
416 memcpy(out, buf, nbytes);
417 crypto_inc(ctrblk, DES_BLOCK_SIZE);
418 ret = blkcipher_walk_done(desc, walk, 0);
419 }
420 memcpy(walk->iv, ctrblk, DES_BLOCK_SIZE);
421 return ret;
422}
423
424static int ctr_des_encrypt(struct blkcipher_desc *desc,
425 struct scatterlist *dst, struct scatterlist *src,
426 unsigned int nbytes)
427{
428 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
429 struct blkcipher_walk walk;
430
431 blkcipher_walk_init(&walk, dst, src, nbytes);
432 return ctr_desall_crypt(desc, KMCTR_DEA_ENCRYPT, ctx, &walk);
433}
434
435static int ctr_des_decrypt(struct blkcipher_desc *desc,
436 struct scatterlist *dst, struct scatterlist *src,
437 unsigned int nbytes)
438{
439 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
440 struct blkcipher_walk walk;
441
442 blkcipher_walk_init(&walk, dst, src, nbytes);
443 return ctr_desall_crypt(desc, KMCTR_DEA_DECRYPT, ctx, &walk);
444}
445
446static struct crypto_alg ctr_des_alg = {
447 .cra_name = "ctr(des)",
448 .cra_driver_name = "ctr-des-s390",
449 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
450 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
451 .cra_blocksize = 1,
452 .cra_ctxsize = sizeof(struct s390_des_ctx),
453 .cra_type = &crypto_blkcipher_type,
454 .cra_module = THIS_MODULE,
455 .cra_list = LIST_HEAD_INIT(ctr_des_alg.cra_list),
456 .cra_u = {
457 .blkcipher = {
458 .min_keysize = DES_KEY_SIZE,
459 .max_keysize = DES_KEY_SIZE,
460 .ivsize = DES_BLOCK_SIZE,
461 .setkey = des_setkey,
462 .encrypt = ctr_des_encrypt,
463 .decrypt = ctr_des_decrypt,
464 }
465 }
466};
467
468static int ctr_des3_encrypt(struct blkcipher_desc *desc,
469 struct scatterlist *dst, struct scatterlist *src,
470 unsigned int nbytes)
471{
472 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
473 struct blkcipher_walk walk;
474
475 blkcipher_walk_init(&walk, dst, src, nbytes);
476 return ctr_desall_crypt(desc, KMCTR_TDEA_192_ENCRYPT, ctx, &walk);
477}
478
479static int ctr_des3_decrypt(struct blkcipher_desc *desc,
480 struct scatterlist *dst, struct scatterlist *src,
481 unsigned int nbytes)
482{
483 struct s390_des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
484 struct blkcipher_walk walk;
485
486 blkcipher_walk_init(&walk, dst, src, nbytes);
487 return ctr_desall_crypt(desc, KMCTR_TDEA_192_DECRYPT, ctx, &walk);
488}
489
490static struct crypto_alg ctr_des3_alg = {
491 .cra_name = "ctr(des3_ede)",
492 .cra_driver_name = "ctr-des3_ede-s390",
493 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
494 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
495 .cra_blocksize = 1,
496 .cra_ctxsize = sizeof(struct s390_des_ctx),
497 .cra_type = &crypto_blkcipher_type,
498 .cra_module = THIS_MODULE,
499 .cra_list = LIST_HEAD_INIT(ctr_des3_alg.cra_list),
500 .cra_u = {
501 .blkcipher = {
502 .min_keysize = DES3_KEY_SIZE,
503 .max_keysize = DES3_KEY_SIZE,
504 .ivsize = DES_BLOCK_SIZE,
505 .setkey = des3_setkey,
506 .encrypt = ctr_des3_encrypt,
507 .decrypt = ctr_des3_decrypt,
508 }
509 }
510};
511
512static int __init des_s390_init(void)
513{
514 int ret;
515
516 if (!crypt_s390_func_available(KM_DEA_ENCRYPT, CRYPT_S390_MSA) ||
517 !crypt_s390_func_available(KM_TDEA_192_ENCRYPT, CRYPT_S390_MSA))
518 return -EOPNOTSUPP;
519
520 ret = crypto_register_alg(&des_alg);
521 if (ret)
522 goto des_err;
523 ret = crypto_register_alg(&ecb_des_alg);
524 if (ret)
525 goto ecb_des_err;
526 ret = crypto_register_alg(&cbc_des_alg);
527 if (ret)
528 goto cbc_des_err;
529 ret = crypto_register_alg(&des3_alg);
530 if (ret)
531 goto des3_err;
532 ret = crypto_register_alg(&ecb_des3_alg);
533 if (ret)
534 goto ecb_des3_err;
535 ret = crypto_register_alg(&cbc_des3_alg);
536 if (ret)
537 goto cbc_des3_err;
538
539 if (crypt_s390_func_available(KMCTR_DEA_ENCRYPT,
540 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
541 crypt_s390_func_available(KMCTR_TDEA_192_ENCRYPT,
542 CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
543 ret = crypto_register_alg(&ctr_des_alg);
544 if (ret)
545 goto ctr_des_err;
546 ret = crypto_register_alg(&ctr_des3_alg);
547 if (ret)
548 goto ctr_des3_err;
549 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
550 if (!ctrblk) {
551 ret = -ENOMEM;
552 goto ctr_mem_err;
553 }
554 }
555out:
556 return ret;
557
558ctr_mem_err:
559 crypto_unregister_alg(&ctr_des3_alg);
560ctr_des3_err:
561 crypto_unregister_alg(&ctr_des_alg);
562ctr_des_err:
563 crypto_unregister_alg(&cbc_des3_alg);
564cbc_des3_err:
565 crypto_unregister_alg(&ecb_des3_alg);
566ecb_des3_err:
567 crypto_unregister_alg(&des3_alg);
568des3_err:
569 crypto_unregister_alg(&cbc_des_alg);
570cbc_des_err:
571 crypto_unregister_alg(&ecb_des_alg);
572ecb_des_err:
573 crypto_unregister_alg(&des_alg);
574des_err:
575 goto out;
576}
577
578static void __exit des_s390_exit(void)
579{
580 if (ctrblk) {
581 crypto_unregister_alg(&ctr_des_alg);
582 crypto_unregister_alg(&ctr_des3_alg);
583 free_page((unsigned long) ctrblk);
584 }
585 crypto_unregister_alg(&cbc_des3_alg);
586 crypto_unregister_alg(&ecb_des3_alg);
587 crypto_unregister_alg(&des3_alg);
588 crypto_unregister_alg(&cbc_des_alg);
589 crypto_unregister_alg(&ecb_des_alg);
590 crypto_unregister_alg(&des_alg);
591}
592
593module_init(des_s390_init);
594module_exit(des_s390_exit);
595
596MODULE_ALIAS("des");
597MODULE_ALIAS("des3_ede");
598
599MODULE_LICENSE("GPL");
600MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");