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