1
2#include <linux/crypto.h>
3#include <linux/kernel.h>
4#include <linux/module.h>
5#include <linux/printk.h>
6
7#include <crypto/aes.h>
8#include <crypto/skcipher.h>
9#include <crypto/scatterwalk.h>
10#include <crypto/ctr.h>
11#include <crypto/internal/des.h>
12#include <crypto/xts.h>
13
14#include "nitrox_dev.h"
15#include "nitrox_common.h"
16#include "nitrox_req.h"
17
18struct nitrox_cipher {
19 const char *name;
20 enum flexi_cipher value;
21};
22
23
24
25
26static const struct nitrox_cipher flexi_cipher_table[] = {
27 { "null", CIPHER_NULL },
28 { "cbc(des3_ede)", CIPHER_3DES_CBC },
29 { "ecb(des3_ede)", CIPHER_3DES_ECB },
30 { "cbc(aes)", CIPHER_AES_CBC },
31 { "ecb(aes)", CIPHER_AES_ECB },
32 { "cfb(aes)", CIPHER_AES_CFB },
33 { "rfc3686(ctr(aes))", CIPHER_AES_CTR },
34 { "xts(aes)", CIPHER_AES_XTS },
35 { "cts(cbc(aes))", CIPHER_AES_CBC_CTS },
36 { NULL, CIPHER_INVALID }
37};
38
39static enum flexi_cipher flexi_cipher_type(const char *name)
40{
41 const struct nitrox_cipher *cipher = flexi_cipher_table;
42
43 while (cipher->name) {
44 if (!strcmp(cipher->name, name))
45 break;
46 cipher++;
47 }
48 return cipher->value;
49}
50
51static void free_src_sglist(struct skcipher_request *skreq)
52{
53 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
54
55 kfree(nkreq->src);
56}
57
58static void free_dst_sglist(struct skcipher_request *skreq)
59{
60 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
61
62 kfree(nkreq->dst);
63}
64
65static void nitrox_skcipher_callback(void *arg, int err)
66{
67 struct skcipher_request *skreq = arg;
68
69 free_src_sglist(skreq);
70 free_dst_sglist(skreq);
71 if (err) {
72 pr_err_ratelimited("request failed status 0x%0x\n", err);
73 err = -EINVAL;
74 }
75
76 skcipher_request_complete(skreq, err);
77}
78
79static void nitrox_cbc_cipher_callback(void *arg, int err)
80{
81 struct skcipher_request *skreq = arg;
82 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
83 struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
84 int ivsize = crypto_skcipher_ivsize(cipher);
85 unsigned int start = skreq->cryptlen - ivsize;
86
87 if (err) {
88 nitrox_skcipher_callback(arg, err);
89 return;
90 }
91
92 if (nkreq->creq.ctrl.s.arg == ENCRYPT) {
93 scatterwalk_map_and_copy(skreq->iv, skreq->dst, start, ivsize,
94 0);
95 } else {
96 if (skreq->src != skreq->dst) {
97 scatterwalk_map_and_copy(skreq->iv, skreq->src, start,
98 ivsize, 0);
99 } else {
100 memcpy(skreq->iv, nkreq->iv_out, ivsize);
101 kfree(nkreq->iv_out);
102 }
103 }
104
105 nitrox_skcipher_callback(arg, err);
106}
107
108static int nitrox_skcipher_init(struct crypto_skcipher *tfm)
109{
110 struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
111 struct crypto_ctx_hdr *chdr;
112
113
114 nctx->ndev = nitrox_get_first_device();
115 if (!nctx->ndev)
116 return -ENODEV;
117
118
119 chdr = crypto_alloc_context(nctx->ndev);
120 if (!chdr) {
121 nitrox_put_device(nctx->ndev);
122 return -ENOMEM;
123 }
124
125 nctx->callback = nitrox_skcipher_callback;
126 nctx->chdr = chdr;
127 nctx->u.ctx_handle = (uintptr_t)((u8 *)chdr->vaddr +
128 sizeof(struct ctx_hdr));
129 crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(tfm) +
130 sizeof(struct nitrox_kcrypt_request));
131 return 0;
132}
133
134static int nitrox_cbc_init(struct crypto_skcipher *tfm)
135{
136 int err;
137 struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
138
139 err = nitrox_skcipher_init(tfm);
140 if (err)
141 return err;
142
143 nctx->callback = nitrox_cbc_cipher_callback;
144 return 0;
145}
146
147static void nitrox_skcipher_exit(struct crypto_skcipher *tfm)
148{
149 struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
150
151
152 if (nctx->u.ctx_handle) {
153 struct flexi_crypto_context *fctx = nctx->u.fctx;
154
155 memzero_explicit(&fctx->crypto, sizeof(struct crypto_keys));
156 memzero_explicit(&fctx->auth, sizeof(struct auth_keys));
157 crypto_free_context((void *)nctx->chdr);
158 }
159 nitrox_put_device(nctx->ndev);
160
161 nctx->u.ctx_handle = 0;
162 nctx->ndev = NULL;
163}
164
165static inline int nitrox_skcipher_setkey(struct crypto_skcipher *cipher,
166 int aes_keylen, const u8 *key,
167 unsigned int keylen)
168{
169 struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
170 struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
171 struct flexi_crypto_context *fctx;
172 union fc_ctx_flags *flags;
173 enum flexi_cipher cipher_type;
174 const char *name;
175
176 name = crypto_tfm_alg_name(tfm);
177 cipher_type = flexi_cipher_type(name);
178 if (unlikely(cipher_type == CIPHER_INVALID)) {
179 pr_err("unsupported cipher: %s\n", name);
180 return -EINVAL;
181 }
182
183
184 fctx = nctx->u.fctx;
185 flags = &fctx->flags;
186 flags->f = 0;
187 flags->w0.cipher_type = cipher_type;
188 flags->w0.aes_keylen = aes_keylen;
189 flags->w0.iv_source = IV_FROM_DPTR;
190 flags->f = cpu_to_be64(*(u64 *)&flags->w0);
191
192 memcpy(fctx->crypto.u.key, key, keylen);
193
194 return 0;
195}
196
197static int nitrox_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
198 unsigned int keylen)
199{
200 int aes_keylen;
201
202 aes_keylen = flexi_aes_keylen(keylen);
203 if (aes_keylen < 0)
204 return -EINVAL;
205 return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
206}
207
208static int alloc_src_sglist(struct skcipher_request *skreq, int ivsize)
209{
210 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
211 int nents = sg_nents(skreq->src) + 1;
212 int ret;
213
214
215 ret = alloc_src_req_buf(nkreq, nents, ivsize);
216 if (ret)
217 return ret;
218
219 nitrox_creq_copy_iv(nkreq->src, skreq->iv, ivsize);
220 nitrox_creq_set_src_sg(nkreq, nents, ivsize, skreq->src,
221 skreq->cryptlen);
222
223 return 0;
224}
225
226static int alloc_dst_sglist(struct skcipher_request *skreq, int ivsize)
227{
228 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
229 int nents = sg_nents(skreq->dst) + 3;
230 int ret;
231
232
233
234
235 ret = alloc_dst_req_buf(nkreq, nents);
236 if (ret)
237 return ret;
238
239 nitrox_creq_set_orh(nkreq);
240 nitrox_creq_set_comp(nkreq);
241 nitrox_creq_set_dst_sg(nkreq, nents, ivsize, skreq->dst,
242 skreq->cryptlen);
243
244 return 0;
245}
246
247static int nitrox_skcipher_crypt(struct skcipher_request *skreq, bool enc)
248{
249 struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
250 struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(cipher);
251 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
252 int ivsize = crypto_skcipher_ivsize(cipher);
253 struct se_crypto_request *creq;
254 int ret;
255
256 creq = &nkreq->creq;
257 creq->flags = skreq->base.flags;
258 creq->gfp = (skreq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
259 GFP_KERNEL : GFP_ATOMIC;
260
261
262 creq->ctrl.value = 0;
263 creq->opcode = FLEXI_CRYPTO_ENCRYPT_HMAC;
264 creq->ctrl.s.arg = (enc ? ENCRYPT : DECRYPT);
265
266 creq->gph.param0 = cpu_to_be16(skreq->cryptlen);
267 creq->gph.param1 = 0;
268
269 creq->gph.param2 = cpu_to_be16(ivsize);
270 creq->gph.param3 = 0;
271
272 creq->ctx_handle = nctx->u.ctx_handle;
273 creq->ctrl.s.ctxl = sizeof(struct flexi_crypto_context);
274
275 ret = alloc_src_sglist(skreq, ivsize);
276 if (ret)
277 return ret;
278
279 ret = alloc_dst_sglist(skreq, ivsize);
280 if (ret) {
281 free_src_sglist(skreq);
282 return ret;
283 }
284
285
286 return nitrox_process_se_request(nctx->ndev, creq, nctx->callback,
287 skreq);
288}
289
290static int nitrox_cbc_decrypt(struct skcipher_request *skreq)
291{
292 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
293 struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
294 int ivsize = crypto_skcipher_ivsize(cipher);
295 gfp_t flags = (skreq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
296 GFP_KERNEL : GFP_ATOMIC;
297 unsigned int start = skreq->cryptlen - ivsize;
298
299 if (skreq->src != skreq->dst)
300 return nitrox_skcipher_crypt(skreq, false);
301
302 nkreq->iv_out = kmalloc(ivsize, flags);
303 if (!nkreq->iv_out)
304 return -ENOMEM;
305
306 scatterwalk_map_and_copy(nkreq->iv_out, skreq->src, start, ivsize, 0);
307 return nitrox_skcipher_crypt(skreq, false);
308}
309
310static int nitrox_aes_encrypt(struct skcipher_request *skreq)
311{
312 return nitrox_skcipher_crypt(skreq, true);
313}
314
315static int nitrox_aes_decrypt(struct skcipher_request *skreq)
316{
317 return nitrox_skcipher_crypt(skreq, false);
318}
319
320static int nitrox_3des_setkey(struct crypto_skcipher *cipher,
321 const u8 *key, unsigned int keylen)
322{
323 return verify_skcipher_des3_key(cipher, key) ?:
324 nitrox_skcipher_setkey(cipher, 0, key, keylen);
325}
326
327static int nitrox_3des_encrypt(struct skcipher_request *skreq)
328{
329 return nitrox_skcipher_crypt(skreq, true);
330}
331
332static int nitrox_3des_decrypt(struct skcipher_request *skreq)
333{
334 return nitrox_skcipher_crypt(skreq, false);
335}
336
337static int nitrox_aes_xts_setkey(struct crypto_skcipher *cipher,
338 const u8 *key, unsigned int keylen)
339{
340 struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
341 struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
342 struct flexi_crypto_context *fctx;
343 int aes_keylen, ret;
344
345 ret = xts_check_key(tfm, key, keylen);
346 if (ret)
347 return ret;
348
349 keylen /= 2;
350
351 aes_keylen = flexi_aes_keylen(keylen);
352 if (aes_keylen < 0)
353 return -EINVAL;
354
355 fctx = nctx->u.fctx;
356
357 memcpy(fctx->auth.u.key2, (key + keylen), keylen);
358
359 return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
360}
361
362static int nitrox_aes_ctr_rfc3686_setkey(struct crypto_skcipher *cipher,
363 const u8 *key, unsigned int keylen)
364{
365 struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
366 struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
367 struct flexi_crypto_context *fctx;
368 int aes_keylen;
369
370 if (keylen < CTR_RFC3686_NONCE_SIZE)
371 return -EINVAL;
372
373 fctx = nctx->u.fctx;
374
375 memcpy(fctx->crypto.iv, key + (keylen - CTR_RFC3686_NONCE_SIZE),
376 CTR_RFC3686_NONCE_SIZE);
377
378 keylen -= CTR_RFC3686_NONCE_SIZE;
379
380 aes_keylen = flexi_aes_keylen(keylen);
381 if (aes_keylen < 0)
382 return -EINVAL;
383 return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
384}
385
386static struct skcipher_alg nitrox_skciphers[] = { {
387 .base = {
388 .cra_name = "cbc(aes)",
389 .cra_driver_name = "n5_cbc(aes)",
390 .cra_priority = PRIO,
391 .cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
392 .cra_blocksize = AES_BLOCK_SIZE,
393 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
394 .cra_alignmask = 0,
395 .cra_module = THIS_MODULE,
396 },
397 .min_keysize = AES_MIN_KEY_SIZE,
398 .max_keysize = AES_MAX_KEY_SIZE,
399 .ivsize = AES_BLOCK_SIZE,
400 .setkey = nitrox_aes_setkey,
401 .encrypt = nitrox_aes_encrypt,
402 .decrypt = nitrox_cbc_decrypt,
403 .init = nitrox_cbc_init,
404 .exit = nitrox_skcipher_exit,
405}, {
406 .base = {
407 .cra_name = "ecb(aes)",
408 .cra_driver_name = "n5_ecb(aes)",
409 .cra_priority = PRIO,
410 .cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
411 .cra_blocksize = AES_BLOCK_SIZE,
412 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
413 .cra_alignmask = 0,
414 .cra_module = THIS_MODULE,
415 },
416 .min_keysize = AES_MIN_KEY_SIZE,
417 .max_keysize = AES_MAX_KEY_SIZE,
418 .ivsize = AES_BLOCK_SIZE,
419 .setkey = nitrox_aes_setkey,
420 .encrypt = nitrox_aes_encrypt,
421 .decrypt = nitrox_aes_decrypt,
422 .init = nitrox_skcipher_init,
423 .exit = nitrox_skcipher_exit,
424}, {
425 .base = {
426 .cra_name = "cfb(aes)",
427 .cra_driver_name = "n5_cfb(aes)",
428 .cra_priority = PRIO,
429 .cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
430 .cra_blocksize = AES_BLOCK_SIZE,
431 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
432 .cra_alignmask = 0,
433 .cra_module = THIS_MODULE,
434 },
435 .min_keysize = AES_MIN_KEY_SIZE,
436 .max_keysize = AES_MAX_KEY_SIZE,
437 .ivsize = AES_BLOCK_SIZE,
438 .setkey = nitrox_aes_setkey,
439 .encrypt = nitrox_aes_encrypt,
440 .decrypt = nitrox_aes_decrypt,
441 .init = nitrox_skcipher_init,
442 .exit = nitrox_skcipher_exit,
443}, {
444 .base = {
445 .cra_name = "xts(aes)",
446 .cra_driver_name = "n5_xts(aes)",
447 .cra_priority = PRIO,
448 .cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
449 .cra_blocksize = AES_BLOCK_SIZE,
450 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
451 .cra_alignmask = 0,
452 .cra_module = THIS_MODULE,
453 },
454 .min_keysize = 2 * AES_MIN_KEY_SIZE,
455 .max_keysize = 2 * AES_MAX_KEY_SIZE,
456 .ivsize = AES_BLOCK_SIZE,
457 .setkey = nitrox_aes_xts_setkey,
458 .encrypt = nitrox_aes_encrypt,
459 .decrypt = nitrox_aes_decrypt,
460 .init = nitrox_skcipher_init,
461 .exit = nitrox_skcipher_exit,
462}, {
463 .base = {
464 .cra_name = "rfc3686(ctr(aes))",
465 .cra_driver_name = "n5_rfc3686(ctr(aes))",
466 .cra_priority = PRIO,
467 .cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
468 .cra_blocksize = 1,
469 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
470 .cra_alignmask = 0,
471 .cra_module = THIS_MODULE,
472 },
473 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
474 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
475 .ivsize = CTR_RFC3686_IV_SIZE,
476 .init = nitrox_skcipher_init,
477 .exit = nitrox_skcipher_exit,
478 .setkey = nitrox_aes_ctr_rfc3686_setkey,
479 .encrypt = nitrox_aes_encrypt,
480 .decrypt = nitrox_aes_decrypt,
481}, {
482 .base = {
483 .cra_name = "cts(cbc(aes))",
484 .cra_driver_name = "n5_cts(cbc(aes))",
485 .cra_priority = PRIO,
486 .cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
487 .cra_blocksize = AES_BLOCK_SIZE,
488 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
489 .cra_alignmask = 0,
490 .cra_module = THIS_MODULE,
491 },
492 .min_keysize = AES_MIN_KEY_SIZE,
493 .max_keysize = AES_MAX_KEY_SIZE,
494 .ivsize = AES_BLOCK_SIZE,
495 .setkey = nitrox_aes_setkey,
496 .encrypt = nitrox_aes_encrypt,
497 .decrypt = nitrox_aes_decrypt,
498 .init = nitrox_skcipher_init,
499 .exit = nitrox_skcipher_exit,
500}, {
501 .base = {
502 .cra_name = "cbc(des3_ede)",
503 .cra_driver_name = "n5_cbc(des3_ede)",
504 .cra_priority = PRIO,
505 .cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
506 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
507 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
508 .cra_alignmask = 0,
509 .cra_module = THIS_MODULE,
510 },
511 .min_keysize = DES3_EDE_KEY_SIZE,
512 .max_keysize = DES3_EDE_KEY_SIZE,
513 .ivsize = DES3_EDE_BLOCK_SIZE,
514 .setkey = nitrox_3des_setkey,
515 .encrypt = nitrox_3des_encrypt,
516 .decrypt = nitrox_cbc_decrypt,
517 .init = nitrox_cbc_init,
518 .exit = nitrox_skcipher_exit,
519}, {
520 .base = {
521 .cra_name = "ecb(des3_ede)",
522 .cra_driver_name = "n5_ecb(des3_ede)",
523 .cra_priority = PRIO,
524 .cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
525 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
526 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
527 .cra_alignmask = 0,
528 .cra_module = THIS_MODULE,
529 },
530 .min_keysize = DES3_EDE_KEY_SIZE,
531 .max_keysize = DES3_EDE_KEY_SIZE,
532 .ivsize = DES3_EDE_BLOCK_SIZE,
533 .setkey = nitrox_3des_setkey,
534 .encrypt = nitrox_3des_encrypt,
535 .decrypt = nitrox_3des_decrypt,
536 .init = nitrox_skcipher_init,
537 .exit = nitrox_skcipher_exit,
538}
539
540};
541
542int nitrox_register_skciphers(void)
543{
544 return crypto_register_skciphers(nitrox_skciphers,
545 ARRAY_SIZE(nitrox_skciphers));
546}
547
548void nitrox_unregister_skciphers(void)
549{
550 crypto_unregister_skciphers(nitrox_skciphers,
551 ARRAY_SIZE(nitrox_skciphers));
552}
553
