1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright IBM Corp. 2001, 2012
4 * Author(s): Robert Burroughs
5 * Eric Rossman (edrossma@us.ibm.com)
6 *
7 * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
8 * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
9 * Ralph Wuerthner <rwuerthn@de.ibm.com>
10 * MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
11 */
12
13 #define KMSG_COMPONENT "zcrypt"
14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/err.h>
20 #include <linux/atomic.h>
21 #include <linux/uaccess.h>
22
23 #include "ap_bus.h"
24 #include "zcrypt_api.h"
25 #include "zcrypt_error.h"
26 #include "zcrypt_msgtype50.h"
27
28 /* >= CEX3A: 4096 bits */
29 #define CEX3A_MAX_MOD_SIZE 512
30
31 /* CEX2A: max outputdatalength + type80_hdr */
32 #define CEX2A_MAX_RESPONSE_SIZE 0x110
33
34 /* >= CEX3A: 512 bit modulus, (max outputdatalength) + type80_hdr */
35 #define CEX3A_MAX_RESPONSE_SIZE 0x210
36
37 MODULE_AUTHOR("IBM Corporation");
38 MODULE_DESCRIPTION("Cryptographic Accelerator (message type 50), " \
39 "Copyright IBM Corp. 2001, 2012");
40 MODULE_LICENSE("GPL");
41
42 /*
43 * The type 50 message family is associated with a CEXxA cards.
44 *
45 * The four members of the family are described below.
46 *
47 * Note that all unsigned char arrays are right-justified and left-padded
48 * with zeroes.
49 *
50 * Note that all reserved fields must be zeroes.
51 */
52 struct type50_hdr {
53 unsigned char reserved1;
54 unsigned char msg_type_code; /* 0x50 */
55 unsigned short msg_len;
56 unsigned char reserved2;
57 unsigned char ignored;
58 unsigned short reserved3;
59 } __packed;
60
61 #define TYPE50_TYPE_CODE 0x50
62
63 #define TYPE50_MEB1_FMT 0x0001
64 #define TYPE50_MEB2_FMT 0x0002
65 #define TYPE50_MEB3_FMT 0x0003
66 #define TYPE50_CRB1_FMT 0x0011
67 #define TYPE50_CRB2_FMT 0x0012
68 #define TYPE50_CRB3_FMT 0x0013
69
70 /* Mod-Exp, with a small modulus */
71 struct type50_meb1_msg {
72 struct type50_hdr header;
73 unsigned short keyblock_type; /* 0x0001 */
74 unsigned char reserved[6];
75 unsigned char exponent[128];
76 unsigned char modulus[128];
77 unsigned char message[128];
78 } __packed;
79
80 /* Mod-Exp, with a large modulus */
81 struct type50_meb2_msg {
82 struct type50_hdr header;
83 unsigned short keyblock_type; /* 0x0002 */
84 unsigned char reserved[6];
85 unsigned char exponent[256];
86 unsigned char modulus[256];
87 unsigned char message[256];
88 } __packed;
89
90 /* Mod-Exp, with a larger modulus */
91 struct type50_meb3_msg {
92 struct type50_hdr header;
93 unsigned short keyblock_type; /* 0x0003 */
94 unsigned char reserved[6];
95 unsigned char exponent[512];
96 unsigned char modulus[512];
97 unsigned char message[512];
98 } __packed;
99
100 /* CRT, with a small modulus */
101 struct type50_crb1_msg {
102 struct type50_hdr header;
103 unsigned short keyblock_type; /* 0x0011 */
104 unsigned char reserved[6];
105 unsigned char p[64];
106 unsigned char q[64];
107 unsigned char dp[64];
108 unsigned char dq[64];
109 unsigned char u[64];
110 unsigned char message[128];
111 } __packed;
112
113 /* CRT, with a large modulus */
114 struct type50_crb2_msg {
115 struct type50_hdr header;
116 unsigned short keyblock_type; /* 0x0012 */
117 unsigned char reserved[6];
118 unsigned char p[128];
119 unsigned char q[128];
120 unsigned char dp[128];
121 unsigned char dq[128];
122 unsigned char u[128];
123 unsigned char message[256];
124 } __packed;
125
126 /* CRT, with a larger modulus */
127 struct type50_crb3_msg {
128 struct type50_hdr header;
129 unsigned short keyblock_type; /* 0x0013 */
130 unsigned char reserved[6];
131 unsigned char p[256];
132 unsigned char q[256];
133 unsigned char dp[256];
134 unsigned char dq[256];
135 unsigned char u[256];
136 unsigned char message[512];
137 } __packed;
138
139 /*
140 * The type 80 response family is associated with a CEXxA cards.
141 *
142 * Note that all unsigned char arrays are right-justified and left-padded
143 * with zeroes.
144 *
145 * Note that all reserved fields must be zeroes.
146 */
147
148 #define TYPE80_RSP_CODE 0x80
149
150 struct type80_hdr {
151 unsigned char reserved1;
152 unsigned char type; /* 0x80 */
153 unsigned short len;
154 unsigned char code; /* 0x00 */
155 unsigned char reserved2[3];
156 unsigned char reserved3[8];
157 } __packed;
158
get_rsa_modex_fc(struct ica_rsa_modexpo * mex,int * fcode)159 int get_rsa_modex_fc(struct ica_rsa_modexpo *mex, int *fcode)
160 {
161 if (!mex->inputdatalength)
162 return -EINVAL;
163
164 if (mex->inputdatalength <= 128) /* 1024 bit */
165 *fcode = MEX_1K;
166 else if (mex->inputdatalength <= 256) /* 2048 bit */
167 *fcode = MEX_2K;
168 else /* 4096 bit */
169 *fcode = MEX_4K;
170
171 return 0;
172 }
173
get_rsa_crt_fc(struct ica_rsa_modexpo_crt * crt,int * fcode)174 int get_rsa_crt_fc(struct ica_rsa_modexpo_crt *crt, int *fcode)
175 {
176 if (!crt->inputdatalength)
177 return -EINVAL;
178
179 if (crt->inputdatalength <= 128) /* 1024 bit */
180 *fcode = CRT_1K;
181 else if (crt->inputdatalength <= 256) /* 2048 bit */
182 *fcode = CRT_2K;
183 else /* 4096 bit */
184 *fcode = CRT_4K;
185
186 return 0;
187 }
188
189 /*
190 * Convert a ICAMEX message to a type50 MEX message.
191 *
192 * @zq: crypto queue pointer
193 * @ap_msg: crypto request pointer
194 * @mex: pointer to user input data
195 *
196 * Returns 0 on success or -EFAULT.
197 */
ICAMEX_msg_to_type50MEX_msg(struct zcrypt_queue * zq,struct ap_message * ap_msg,struct ica_rsa_modexpo * mex)198 static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_queue *zq,
199 struct ap_message *ap_msg,
200 struct ica_rsa_modexpo *mex)
201 {
202 unsigned char *mod, *exp, *inp;
203 int mod_len;
204
205 mod_len = mex->inputdatalength;
206
207 if (mod_len <= 128) {
208 struct type50_meb1_msg *meb1 = ap_msg->msg;
209
210 memset(meb1, 0, sizeof(*meb1));
211 ap_msg->len = sizeof(*meb1);
212 meb1->header.msg_type_code = TYPE50_TYPE_CODE;
213 meb1->header.msg_len = sizeof(*meb1);
214 meb1->keyblock_type = TYPE50_MEB1_FMT;
215 mod = meb1->modulus + sizeof(meb1->modulus) - mod_len;
216 exp = meb1->exponent + sizeof(meb1->exponent) - mod_len;
217 inp = meb1->message + sizeof(meb1->message) - mod_len;
218 } else if (mod_len <= 256) {
219 struct type50_meb2_msg *meb2 = ap_msg->msg;
220
221 memset(meb2, 0, sizeof(*meb2));
222 ap_msg->len = sizeof(*meb2);
223 meb2->header.msg_type_code = TYPE50_TYPE_CODE;
224 meb2->header.msg_len = sizeof(*meb2);
225 meb2->keyblock_type = TYPE50_MEB2_FMT;
226 mod = meb2->modulus + sizeof(meb2->modulus) - mod_len;
227 exp = meb2->exponent + sizeof(meb2->exponent) - mod_len;
228 inp = meb2->message + sizeof(meb2->message) - mod_len;
229 } else if (mod_len <= 512) {
230 struct type50_meb3_msg *meb3 = ap_msg->msg;
231
232 memset(meb3, 0, sizeof(*meb3));
233 ap_msg->len = sizeof(*meb3);
234 meb3->header.msg_type_code = TYPE50_TYPE_CODE;
235 meb3->header.msg_len = sizeof(*meb3);
236 meb3->keyblock_type = TYPE50_MEB3_FMT;
237 mod = meb3->modulus + sizeof(meb3->modulus) - mod_len;
238 exp = meb3->exponent + sizeof(meb3->exponent) - mod_len;
239 inp = meb3->message + sizeof(meb3->message) - mod_len;
240 } else {
241 return -EINVAL;
242 }
243
244 if (copy_from_user(mod, mex->n_modulus, mod_len) ||
245 copy_from_user(exp, mex->b_key, mod_len) ||
246 copy_from_user(inp, mex->inputdata, mod_len))
247 return -EFAULT;
248
249 #ifdef CONFIG_ZCRYPT_DEBUG
250 if (ap_msg->fi.flags & AP_FI_FLAG_TOGGLE_SPECIAL)
251 ap_msg->flags ^= AP_MSG_FLAG_SPECIAL;
252 #endif
253
254 return 0;
255 }
256
257 /*
258 * Convert a ICACRT message to a type50 CRT message.
259 *
260 * @zq: crypto queue pointer
261 * @ap_msg: crypto request pointer
262 * @crt: pointer to user input data
263 *
264 * Returns 0 on success or -EFAULT.
265 */
ICACRT_msg_to_type50CRT_msg(struct zcrypt_queue * zq,struct ap_message * ap_msg,struct ica_rsa_modexpo_crt * crt)266 static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_queue *zq,
267 struct ap_message *ap_msg,
268 struct ica_rsa_modexpo_crt *crt)
269 {
270 int mod_len, short_len;
271 unsigned char *p, *q, *dp, *dq, *u, *inp;
272
273 mod_len = crt->inputdatalength;
274 short_len = (mod_len + 1) / 2;
275
276 /*
277 * CEX2A and CEX3A w/o FW update can handle requests up to
278 * 256 byte modulus (2k keys).
279 * CEX3A with FW update and newer CEXxA cards are able to handle
280 * 512 byte modulus (4k keys).
281 */
282 if (mod_len <= 128) { /* up to 1024 bit key size */
283 struct type50_crb1_msg *crb1 = ap_msg->msg;
284
285 memset(crb1, 0, sizeof(*crb1));
286 ap_msg->len = sizeof(*crb1);
287 crb1->header.msg_type_code = TYPE50_TYPE_CODE;
288 crb1->header.msg_len = sizeof(*crb1);
289 crb1->keyblock_type = TYPE50_CRB1_FMT;
290 p = crb1->p + sizeof(crb1->p) - short_len;
291 q = crb1->q + sizeof(crb1->q) - short_len;
292 dp = crb1->dp + sizeof(crb1->dp) - short_len;
293 dq = crb1->dq + sizeof(crb1->dq) - short_len;
294 u = crb1->u + sizeof(crb1->u) - short_len;
295 inp = crb1->message + sizeof(crb1->message) - mod_len;
296 } else if (mod_len <= 256) { /* up to 2048 bit key size */
297 struct type50_crb2_msg *crb2 = ap_msg->msg;
298
299 memset(crb2, 0, sizeof(*crb2));
300 ap_msg->len = sizeof(*crb2);
301 crb2->header.msg_type_code = TYPE50_TYPE_CODE;
302 crb2->header.msg_len = sizeof(*crb2);
303 crb2->keyblock_type = TYPE50_CRB2_FMT;
304 p = crb2->p + sizeof(crb2->p) - short_len;
305 q = crb2->q + sizeof(crb2->q) - short_len;
306 dp = crb2->dp + sizeof(crb2->dp) - short_len;
307 dq = crb2->dq + sizeof(crb2->dq) - short_len;
308 u = crb2->u + sizeof(crb2->u) - short_len;
309 inp = crb2->message + sizeof(crb2->message) - mod_len;
310 } else if ((mod_len <= 512) && /* up to 4096 bit key size */
311 (zq->zcard->max_mod_size == CEX3A_MAX_MOD_SIZE)) {
312 struct type50_crb3_msg *crb3 = ap_msg->msg;
313
314 memset(crb3, 0, sizeof(*crb3));
315 ap_msg->len = sizeof(*crb3);
316 crb3->header.msg_type_code = TYPE50_TYPE_CODE;
317 crb3->header.msg_len = sizeof(*crb3);
318 crb3->keyblock_type = TYPE50_CRB3_FMT;
319 p = crb3->p + sizeof(crb3->p) - short_len;
320 q = crb3->q + sizeof(crb3->q) - short_len;
321 dp = crb3->dp + sizeof(crb3->dp) - short_len;
322 dq = crb3->dq + sizeof(crb3->dq) - short_len;
323 u = crb3->u + sizeof(crb3->u) - short_len;
324 inp = crb3->message + sizeof(crb3->message) - mod_len;
325 } else {
326 return -EINVAL;
327 }
328
329 /*
330 * correct the offset of p, bp and mult_inv according zcrypt.h
331 * block size right aligned (skip the first byte)
332 */
333 if (copy_from_user(p, crt->np_prime + MSGTYPE_ADJUSTMENT, short_len) ||
334 copy_from_user(q, crt->nq_prime, short_len) ||
335 copy_from_user(dp, crt->bp_key + MSGTYPE_ADJUSTMENT, short_len) ||
336 copy_from_user(dq, crt->bq_key, short_len) ||
337 copy_from_user(u, crt->u_mult_inv + MSGTYPE_ADJUSTMENT, short_len) ||
338 copy_from_user(inp, crt->inputdata, mod_len))
339 return -EFAULT;
340
341 #ifdef CONFIG_ZCRYPT_DEBUG
342 if (ap_msg->fi.flags & AP_FI_FLAG_TOGGLE_SPECIAL)
343 ap_msg->flags ^= AP_MSG_FLAG_SPECIAL;
344 #endif
345
346 return 0;
347 }
348
349 /*
350 * Copy results from a type 80 reply message back to user space.
351 *
352 * @zq: crypto device pointer
353 * @reply: reply AP message.
354 * @data: pointer to user output data
355 * @length: size of user output data
356 *
357 * Returns 0 on success or -EFAULT.
358 */
convert_type80(struct zcrypt_queue * zq,struct ap_message * reply,char __user * outputdata,unsigned int outputdatalength)359 static int convert_type80(struct zcrypt_queue *zq,
360 struct ap_message *reply,
361 char __user *outputdata,
362 unsigned int outputdatalength)
363 {
364 struct type80_hdr *t80h = reply->msg;
365 unsigned char *data;
366
367 if (t80h->len < sizeof(*t80h) + outputdatalength) {
368 /* The result is too short, the CEXxA card may not do that.. */
369 zq->online = 0;
370 pr_err("Crypto dev=%02x.%04x code=0x%02x => online=0 rc=EAGAIN\n",
371 AP_QID_CARD(zq->queue->qid),
372 AP_QID_QUEUE(zq->queue->qid), t80h->code);
373 ZCRYPT_DBF_ERR("%s dev=%02x.%04x code=0x%02x => online=0 rc=EAGAIN\n",
374 __func__, AP_QID_CARD(zq->queue->qid),
375 AP_QID_QUEUE(zq->queue->qid), t80h->code);
376 ap_send_online_uevent(&zq->queue->ap_dev, zq->online);
377 return -EAGAIN;
378 }
379 if (zq->zcard->user_space_type == ZCRYPT_CEX2A)
380 BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE);
381 else
382 BUG_ON(t80h->len > CEX3A_MAX_RESPONSE_SIZE);
383 data = reply->msg + t80h->len - outputdatalength;
384 if (copy_to_user(outputdata, data, outputdatalength))
385 return -EFAULT;
386 return 0;
387 }
388
convert_response_cex2a(struct zcrypt_queue * zq,struct ap_message * reply,char __user * outputdata,unsigned int outputdatalength)389 static int convert_response_cex2a(struct zcrypt_queue *zq,
390 struct ap_message *reply,
391 char __user *outputdata,
392 unsigned int outputdatalength)
393 {
394 /* Response type byte is the second byte in the response. */
395 unsigned char rtype = ((unsigned char *)reply->msg)[1];
396
397 switch (rtype) {
398 case TYPE82_RSP_CODE:
399 case TYPE88_RSP_CODE:
400 return convert_error(zq, reply);
401 case TYPE80_RSP_CODE:
402 return convert_type80(zq, reply,
403 outputdata, outputdatalength);
404 default: /* Unknown response type, this should NEVER EVER happen */
405 zq->online = 0;
406 pr_err("Crypto dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
407 AP_QID_CARD(zq->queue->qid),
408 AP_QID_QUEUE(zq->queue->qid),
409 (int)rtype);
410 ZCRYPT_DBF_ERR(
411 "%s dev=%02x.%04x unknown response type 0x%02x => online=0 rc=EAGAIN\n",
412 __func__, AP_QID_CARD(zq->queue->qid),
413 AP_QID_QUEUE(zq->queue->qid), (int)rtype);
414 ap_send_online_uevent(&zq->queue->ap_dev, zq->online);
415 return -EAGAIN;
416 }
417 }
418
419 /*
420 * This function is called from the AP bus code after a crypto request
421 * "msg" has finished with the reply message "reply".
422 * It is called from tasklet context.
423 * @aq: pointer to the AP device
424 * @msg: pointer to the AP message
425 * @reply: pointer to the AP reply message
426 */
zcrypt_cex2a_receive(struct ap_queue * aq,struct ap_message * msg,struct ap_message * reply)427 static void zcrypt_cex2a_receive(struct ap_queue *aq,
428 struct ap_message *msg,
429 struct ap_message *reply)
430 {
431 static struct error_hdr error_reply = {
432 .type = TYPE82_RSP_CODE,
433 .reply_code = REP82_ERROR_MACHINE_FAILURE,
434 };
435 struct type80_hdr *t80h;
436 int len;
437
438 /* Copy the reply message to the request message buffer. */
439 if (!reply)
440 goto out; /* ap_msg->rc indicates the error */
441 t80h = reply->msg;
442 if (t80h->type == TYPE80_RSP_CODE) {
443 len = t80h->len;
444 if (len > reply->bufsize || len > msg->bufsize) {
445 msg->rc = -EMSGSIZE;
446 } else {
447 memcpy(msg->msg, reply->msg, len);
448 msg->len = len;
449 }
450 } else {
451 memcpy(msg->msg, reply->msg, sizeof(error_reply));
452 }
453 out:
454 complete((struct completion *)msg->private);
455 }
456
457 static atomic_t zcrypt_step = ATOMIC_INIT(0);
458
459 /*
460 * The request distributor calls this function if it picked the CEXxA
461 * device to handle a modexpo request.
462 * @zq: pointer to zcrypt_queue structure that identifies the
463 * CEXxA device to the request distributor
464 * @mex: pointer to the modexpo request buffer
465 */
zcrypt_cex2a_modexpo(struct zcrypt_queue * zq,struct ica_rsa_modexpo * mex,struct ap_message * ap_msg)466 static long zcrypt_cex2a_modexpo(struct zcrypt_queue *zq,
467 struct ica_rsa_modexpo *mex,
468 struct ap_message *ap_msg)
469 {
470 struct completion work;
471 int rc;
472
473 ap_msg->bufsize = (zq->zcard->user_space_type == ZCRYPT_CEX2A) ?
474 MSGTYPE50_CRB2_MAX_MSG_SIZE : MSGTYPE50_CRB3_MAX_MSG_SIZE;
475 ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL);
476 if (!ap_msg->msg)
477 return -ENOMEM;
478 ap_msg->receive = zcrypt_cex2a_receive;
479 ap_msg->psmid = (((unsigned long long)current->pid) << 32) +
480 atomic_inc_return(&zcrypt_step);
481 ap_msg->private = &work;
482 rc = ICAMEX_msg_to_type50MEX_msg(zq, ap_msg, mex);
483 if (rc)
484 goto out;
485 init_completion(&work);
486 rc = ap_queue_message(zq->queue, ap_msg);
487 if (rc)
488 goto out;
489 rc = wait_for_completion_interruptible(&work);
490 if (rc == 0) {
491 rc = ap_msg->rc;
492 if (rc == 0)
493 rc = convert_response_cex2a(zq, ap_msg,
494 mex->outputdata,
495 mex->outputdatalength);
496 } else {
497 /* Signal pending. */
498 ap_cancel_message(zq->queue, ap_msg);
499 }
500
501 out:
502 ap_msg->private = NULL;
503 if (rc)
504 ZCRYPT_DBF_DBG("%s send me cprb at dev=%02x.%04x rc=%d\n",
505 __func__, AP_QID_CARD(zq->queue->qid),
506 AP_QID_QUEUE(zq->queue->qid), rc);
507 return rc;
508 }
509
510 /*
511 * The request distributor calls this function if it picked the CEXxA
512 * device to handle a modexpo_crt request.
513 * @zq: pointer to zcrypt_queue structure that identifies the
514 * CEXxA device to the request distributor
515 * @crt: pointer to the modexpoc_crt request buffer
516 */
zcrypt_cex2a_modexpo_crt(struct zcrypt_queue * zq,struct ica_rsa_modexpo_crt * crt,struct ap_message * ap_msg)517 static long zcrypt_cex2a_modexpo_crt(struct zcrypt_queue *zq,
518 struct ica_rsa_modexpo_crt *crt,
519 struct ap_message *ap_msg)
520 {
521 struct completion work;
522 int rc;
523
524 ap_msg->bufsize = (zq->zcard->user_space_type == ZCRYPT_CEX2A) ?
525 MSGTYPE50_CRB2_MAX_MSG_SIZE : MSGTYPE50_CRB3_MAX_MSG_SIZE;
526 ap_msg->msg = kmalloc(ap_msg->bufsize, GFP_KERNEL);
527 if (!ap_msg->msg)
528 return -ENOMEM;
529 ap_msg->receive = zcrypt_cex2a_receive;
530 ap_msg->psmid = (((unsigned long long)current->pid) << 32) +
531 atomic_inc_return(&zcrypt_step);
532 ap_msg->private = &work;
533 rc = ICACRT_msg_to_type50CRT_msg(zq, ap_msg, crt);
534 if (rc)
535 goto out;
536 init_completion(&work);
537 rc = ap_queue_message(zq->queue, ap_msg);
538 if (rc)
539 goto out;
540 rc = wait_for_completion_interruptible(&work);
541 if (rc == 0) {
542 rc = ap_msg->rc;
543 if (rc == 0)
544 rc = convert_response_cex2a(zq, ap_msg,
545 crt->outputdata,
546 crt->outputdatalength);
547 } else {
548 /* Signal pending. */
549 ap_cancel_message(zq->queue, ap_msg);
550 }
551
552 out:
553 ap_msg->private = NULL;
554 if (rc)
555 ZCRYPT_DBF_DBG("%s send crt cprb at dev=%02x.%04x rc=%d\n",
556 __func__, AP_QID_CARD(zq->queue->qid),
557 AP_QID_QUEUE(zq->queue->qid), rc);
558 return rc;
559 }
560
561 /*
562 * The crypto operations for message type 50.
563 */
564 static struct zcrypt_ops zcrypt_msgtype50_ops = {
565 .rsa_modexpo = zcrypt_cex2a_modexpo,
566 .rsa_modexpo_crt = zcrypt_cex2a_modexpo_crt,
567 .owner = THIS_MODULE,
568 .name = MSGTYPE50_NAME,
569 .variant = MSGTYPE50_VARIANT_DEFAULT,
570 };
571
zcrypt_msgtype50_init(void)572 void __init zcrypt_msgtype50_init(void)
573 {
574 zcrypt_msgtype_register(&zcrypt_msgtype50_ops);
575 }
576
zcrypt_msgtype50_exit(void)577 void __exit zcrypt_msgtype50_exit(void)
578 {
579 zcrypt_msgtype_unregister(&zcrypt_msgtype50_ops);
580 }
581