summaryrefslogtreecommitdiff
path: root/lib/tpm-v2.c
blob: 235f8c20d4349b1ac5ea783d79369945456c4869 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2018 Bootlin
 * Author: Miquel Raynal <miquel.raynal@bootlin.com>
 */

#include <common.h>
#include <dm.h>
#include <tpm-common.h>
#include <tpm-v2.h>
#include <linux/bitops.h>
#include "tpm-utils.h"

u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode)
{
	const u8 command_v2[12] = {
		tpm_u16(TPM2_ST_NO_SESSIONS),
		tpm_u32(12),
		tpm_u32(TPM2_CC_STARTUP),
		tpm_u16(mode),
	};
	int ret;

	/*
	 * Note TPM2_Startup command will return RC_SUCCESS the first time,
	 * but will return RC_INITIALIZE otherwise.
	 */
	ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
	if (ret && ret != TPM2_RC_INITIALIZE)
		return ret;

	return 0;
}

u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test)
{
	const u8 command_v2[12] = {
		tpm_u16(TPM2_ST_NO_SESSIONS),
		tpm_u32(11),
		tpm_u32(TPM2_CC_SELF_TEST),
		full_test,
	};

	return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw,
	       const ssize_t pw_sz)
{
	/* Length of the message header, up to start of password */
	uint offset = 27;
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(offset + pw_sz),	/* Length */
		tpm_u32(TPM2_CC_CLEAR),		/* Command code */

		/* HANDLE */
		tpm_u32(handle),		/* TPM resource handle */

		/* AUTH_SESSION */
		tpm_u32(9 + pw_sz),		/* Authorization size */
		tpm_u32(TPM2_RS_PW),		/* Session handle */
		tpm_u16(0),			/* Size of <nonce> */
						/* <nonce> (if any) */
		0,				/* Attributes: Cont/Excl/Rst */
		tpm_u16(pw_sz),			/* Size of <hmac/password> */
		/* STRING(pw)			   <hmac/password> (if any) */
	};
	int ret;

	/*
	 * Fill the command structure starting from the first buffer:
	 *     - the password (if any)
	 */
	ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
			       offset, pw, pw_sz);
	offset += pw_sz;
	if (ret)
		return TPM_LIB_ERROR;

	return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

u32 tpm2_nv_define_space(struct udevice *dev, u32 space_index,
			 size_t space_size, u32 nv_attributes,
			 const u8 *nv_policy, size_t nv_policy_size)
{
	/*
	 * Calculate the offset of the nv_policy piece by adding each of the
	 * chunks below.
	 */
	uint offset = 10 + 8 + 13 + 14;
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		/* header 10 bytes */
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(offset + nv_policy_size),/* Length */
		tpm_u32(TPM2_CC_NV_DEFINE_SPACE),/* Command code */

		/* handles 8 bytes */
		tpm_u32(TPM2_RH_PLATFORM),	/* Primary platform seed */

		/* session header 13 bytes */
		tpm_u32(9),			/* Header size */
		tpm_u32(TPM2_RS_PW),		/* Password authorisation */
		tpm_u16(0),			/* nonce_size */
		0,				/* session_attrs */
		tpm_u16(0),			/* auth_size */

		/* message 14 bytes + policy */
		tpm_u16(12 + nv_policy_size),	/* size */
		tpm_u32(space_index),
		tpm_u16(TPM2_ALG_SHA256),
		tpm_u32(nv_attributes),
		tpm_u16(nv_policy_size),
		/* nv_policy */
	};
	int ret;

	/*
	 * Fill the command structure starting from the first buffer:
	 *     - the password (if any)
	 */
	ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
			       offset, nv_policy, nv_policy_size);
	if (ret)
		return TPM_LIB_ERROR;

	return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm,
		    const u8 *digest, u32 digest_len)
{
	/* Length of the message header, up to start of digest */
	uint offset = 33;
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(offset + digest_len),	/* Length */
		tpm_u32(TPM2_CC_PCR_EXTEND),	/* Command code */

		/* HANDLE */
		tpm_u32(index),			/* Handle (PCR Index) */

		/* AUTH_SESSION */
		tpm_u32(9),			/* Authorization size */
		tpm_u32(TPM2_RS_PW),		/* Session handle */
		tpm_u16(0),			/* Size of <nonce> */
						/* <nonce> (if any) */
		0,				/* Attributes: Cont/Excl/Rst */
		tpm_u16(0),			/* Size of <hmac/password> */
						/* <hmac/password> (if any) */

		/* hashes */
		tpm_u32(1),			/* Count (number of hashes) */
		tpm_u16(algorithm),	/* Algorithm of the hash */
		/* STRING(digest)		   Digest */
	};
	int ret;

	/*
	 * Fill the command structure starting from the first buffer:
	 *     - the digest
	 */
	ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
			       offset, digest, digest_len);
	if (ret)
		return TPM_LIB_ERROR;

	return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

u32 tpm2_nv_read_value(struct udevice *dev, u32 index, void *data, u32 count)
{
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		/* header 10 bytes */
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(10 + 8 + 4 + 9 + 4),	/* Length */
		tpm_u32(TPM2_CC_NV_READ),	/* Command code */

		/* handles 8 bytes */
		tpm_u32(TPM2_RH_PLATFORM),	/* Primary platform seed */
		tpm_u32(HR_NV_INDEX + index),	/* Password authorisation */

		/* AUTH_SESSION */
		tpm_u32(9),			/* Authorization size */
		tpm_u32(TPM2_RS_PW),		/* Session handle */
		tpm_u16(0),			/* Size of <nonce> */
						/* <nonce> (if any) */
		0,				/* Attributes: Cont/Excl/Rst */
		tpm_u16(0),			/* Size of <hmac/password> */
						/* <hmac/password> (if any) */

		tpm_u16(count),			/* Number of bytes */
		tpm_u16(0),			/* Offset */
	};
	size_t response_len = COMMAND_BUFFER_SIZE;
	u8 response[COMMAND_BUFFER_SIZE];
	int ret;
	u16 tag;
	u32 size, code;

	ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
	if (ret)
		return log_msg_ret("read", ret);
	if (unpack_byte_string(response, response_len, "wdds",
			       0, &tag, 2, &size, 6, &code,
			       16, data, count))
		return TPM_LIB_ERROR;

	return 0;
}

u32 tpm2_nv_write_value(struct udevice *dev, u32 index, const void *data,
			u32 count)
{
	struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
	uint offset = 10 + 8 + 4 + 9 + 2;
	uint len = offset + count + 2;
	/* Use empty password auth if platform hierarchy is disabled */
	u32 auth = priv->plat_hier_disabled ? HR_NV_INDEX + index :
		TPM2_RH_PLATFORM;
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		/* header 10 bytes */
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(len),			/* Length */
		tpm_u32(TPM2_CC_NV_WRITE),	/* Command code */

		/* handles 8 bytes */
		tpm_u32(auth),			/* Primary platform seed */
		tpm_u32(HR_NV_INDEX + index),	/* Password authorisation */

		/* AUTH_SESSION */
		tpm_u32(9),			/* Authorization size */
		tpm_u32(TPM2_RS_PW),		/* Session handle */
		tpm_u16(0),			/* Size of <nonce> */
						/* <nonce> (if any) */
		0,				/* Attributes: Cont/Excl/Rst */
		tpm_u16(0),			/* Size of <hmac/password> */
						/* <hmac/password> (if any) */

		tpm_u16(count),
	};
	size_t response_len = COMMAND_BUFFER_SIZE;
	u8 response[COMMAND_BUFFER_SIZE];
	int ret;

	ret = pack_byte_string(command_v2, sizeof(command_v2), "sw",
			       offset, data, count,
			       offset + count, 0);
	if (ret)
		return TPM_LIB_ERROR;

	return tpm_sendrecv_command(dev, command_v2, response, &response_len);
}

u32 tpm2_pcr_read(struct udevice *dev, u32 idx, unsigned int idx_min_sz,
		  void *data, unsigned int *updates)
{
	u8 idx_array_sz = max(idx_min_sz, DIV_ROUND_UP(idx, 8));
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		tpm_u16(TPM2_ST_NO_SESSIONS),	/* TAG */
		tpm_u32(17 + idx_array_sz),	/* Length */
		tpm_u32(TPM2_CC_PCR_READ),	/* Command code */

		/* TPML_PCR_SELECTION */
		tpm_u32(1),			/* Number of selections */
		tpm_u16(TPM2_ALG_SHA256),	/* Algorithm of the hash */
		idx_array_sz,			/* Array size for selection */
		/* bitmap(idx)			   Selected PCR bitmap */
	};
	size_t response_len = COMMAND_BUFFER_SIZE;
	u8 response[COMMAND_BUFFER_SIZE];
	unsigned int pcr_sel_idx = idx / 8;
	u8 pcr_sel_bit = BIT(idx % 8);
	unsigned int counter = 0;
	int ret;

	if (pack_byte_string(command_v2, COMMAND_BUFFER_SIZE, "b",
			     17 + pcr_sel_idx, pcr_sel_bit))
		return TPM_LIB_ERROR;

	ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
	if (ret)
		return ret;

	if (unpack_byte_string(response, response_len, "ds",
			       10, &counter,
			       response_len - TPM2_DIGEST_LEN, data,
			       TPM2_DIGEST_LEN))
		return TPM_LIB_ERROR;

	if (updates)
		*updates = counter;

	return 0;
}

u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
			void *buf, size_t prop_count)
{
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		tpm_u16(TPM2_ST_NO_SESSIONS),		/* TAG */
		tpm_u32(22),				/* Length */
		tpm_u32(TPM2_CC_GET_CAPABILITY),	/* Command code */

		tpm_u32(capability),			/* Capability */
		tpm_u32(property),			/* Property */
		tpm_u32(prop_count),			/* Property count */
	};
	u8 response[COMMAND_BUFFER_SIZE];
	size_t response_len = COMMAND_BUFFER_SIZE;
	unsigned int properties_off;
	int ret;

	ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
	if (ret)
		return ret;

	/*
	 * In the response buffer, the properties are located after the:
	 * tag (u16), response size (u32), response code (u32),
	 * YES/NO flag (u8), TPM_CAP (u32).
	 */
	properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) +
			 sizeof(u8) + sizeof(u32);
	memcpy(buf, &response[properties_off], response_len - properties_off);

	return 0;
}

u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz)
{
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(27 + pw_sz),		/* Length */
		tpm_u32(TPM2_CC_DAM_RESET),	/* Command code */

		/* HANDLE */
		tpm_u32(TPM2_RH_LOCKOUT),	/* TPM resource handle */

		/* AUTH_SESSION */
		tpm_u32(9 + pw_sz),		/* Authorization size */
		tpm_u32(TPM2_RS_PW),		/* Session handle */
		tpm_u16(0),			/* Size of <nonce> */
						/* <nonce> (if any) */
		0,				/* Attributes: Cont/Excl/Rst */
		tpm_u16(pw_sz),			/* Size of <hmac/password> */
		/* STRING(pw)			   <hmac/password> (if any) */
	};
	unsigned int offset = 27;
	int ret;

	/*
	 * Fill the command structure starting from the first buffer:
	 *     - the password (if any)
	 */
	ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
			       offset, pw, pw_sz);
	offset += pw_sz;
	if (ret)
		return TPM_LIB_ERROR;

	return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

u32 tpm2_dam_parameters(struct udevice *dev, const char *pw,
			const ssize_t pw_sz, unsigned int max_tries,
			unsigned int recovery_time,
			unsigned int lockout_recovery)
{
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(27 + pw_sz + 12),	/* Length */
		tpm_u32(TPM2_CC_DAM_PARAMETERS), /* Command code */

		/* HANDLE */
		tpm_u32(TPM2_RH_LOCKOUT),	/* TPM resource handle */

		/* AUTH_SESSION */
		tpm_u32(9 + pw_sz),		/* Authorization size */
		tpm_u32(TPM2_RS_PW),		/* Session handle */
		tpm_u16(0),			/* Size of <nonce> */
						/* <nonce> (if any) */
		0,				/* Attributes: Cont/Excl/Rst */
		tpm_u16(pw_sz),			/* Size of <hmac/password> */
		/* STRING(pw)			   <hmac/password> (if any) */

		/* LOCKOUT PARAMETERS */
		/* tpm_u32(max_tries)		   Max tries (0, always lock) */
		/* tpm_u32(recovery_time)	   Recovery time (0, no lock) */
		/* tpm_u32(lockout_recovery)	   Lockout recovery */
	};
	unsigned int offset = 27;
	int ret;

	/*
	 * Fill the command structure starting from the first buffer:
	 *     - the password (if any)
	 *     - max tries
	 *     - recovery time
	 *     - lockout recovery
	 */
	ret = pack_byte_string(command_v2, sizeof(command_v2), "sddd",
			       offset, pw, pw_sz,
			       offset + pw_sz, max_tries,
			       offset + pw_sz + 4, recovery_time,
			       offset + pw_sz + 8, lockout_recovery);
	offset += pw_sz + 12;
	if (ret)
		return TPM_LIB_ERROR;

	return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

int tpm2_change_auth(struct udevice *dev, u32 handle, const char *newpw,
		     const ssize_t newpw_sz, const char *oldpw,
		     const ssize_t oldpw_sz)
{
	unsigned int offset = 27;
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(offset + oldpw_sz + 2 + newpw_sz), /* Length */
		tpm_u32(TPM2_CC_HIERCHANGEAUTH), /* Command code */

		/* HANDLE */
		tpm_u32(handle),		/* TPM resource handle */

		/* AUTH_SESSION */
		tpm_u32(9 + oldpw_sz),		/* Authorization size */
		tpm_u32(TPM2_RS_PW),		/* Session handle */
		tpm_u16(0),			/* Size of <nonce> */
						/* <nonce> (if any) */
		0,				/* Attributes: Cont/Excl/Rst */
		tpm_u16(oldpw_sz)		/* Size of <hmac/password> */
		/* STRING(oldpw)		   <hmac/password> (if any) */

		/* TPM2B_AUTH (TPM2B_DIGEST) */
		/* tpm_u16(newpw_sz)		   Digest size, new pw length */
		/* STRING(newpw)		   Digest buffer, new pw */
	};
	int ret;

	/*
	 * Fill the command structure starting from the first buffer:
	 *     - the old password (if any)
	 *     - size of the new password
	 *     - new password
	 */
	ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
			       offset, oldpw, oldpw_sz,
			       offset + oldpw_sz, newpw_sz,
			       offset + oldpw_sz + 2, newpw, newpw_sz);
	offset += oldpw_sz + 2 + newpw_sz;
	if (ret)
		return TPM_LIB_ERROR;

	return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

u32 tpm2_pcr_setauthpolicy(struct udevice *dev, const char *pw,
			   const ssize_t pw_sz, u32 index, const char *key)
{
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(35 + pw_sz + TPM2_DIGEST_LEN), /* Length */
		tpm_u32(TPM2_CC_PCR_SETAUTHPOL), /* Command code */

		/* HANDLE */
		tpm_u32(TPM2_RH_PLATFORM),	/* TPM resource handle */

		/* AUTH_SESSION */
		tpm_u32(9 + pw_sz),		/* Authorization size */
		tpm_u32(TPM2_RS_PW),		/* session handle */
		tpm_u16(0),			/* Size of <nonce> */
						/* <nonce> (if any) */
		0,				/* Attributes: Cont/Excl/Rst */
		tpm_u16(pw_sz)			/* Size of <hmac/password> */
		/* STRING(pw)			   <hmac/password> (if any) */

		/* TPM2B_AUTH (TPM2B_DIGEST) */
		/* tpm_u16(TPM2_DIGEST_LEN)	   Digest size length */
		/* STRING(key)			   Digest buffer (PCR key) */

		/* TPMI_ALG_HASH */
		/* tpm_u16(TPM2_ALG_SHA256)   Algorithm of the hash */

		/* TPMI_DH_PCR */
		/* tpm_u32(index),		   PCR Index */
	};
	unsigned int offset = 27;
	int ret;

	/*
	 * Fill the command structure starting from the first buffer:
	 *     - the password (if any)
	 *     - the PCR key length
	 *     - the PCR key
	 *     - the hash algorithm
	 *     - the PCR index
	 */
	ret = pack_byte_string(command_v2, sizeof(command_v2), "swswd",
			       offset, pw, pw_sz,
			       offset + pw_sz, TPM2_DIGEST_LEN,
			       offset + pw_sz + 2, key, TPM2_DIGEST_LEN,
			       offset + pw_sz + 2 + TPM2_DIGEST_LEN,
			       TPM2_ALG_SHA256,
			       offset + pw_sz + 4 + TPM2_DIGEST_LEN, index);
	offset += pw_sz + 2 + TPM2_DIGEST_LEN + 2 + 4;
	if (ret)
		return TPM_LIB_ERROR;

	return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw,
			  const ssize_t pw_sz, u32 index, const char *key,
			  const ssize_t key_sz)
{
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(33 + pw_sz + TPM2_DIGEST_LEN), /* Length */
		tpm_u32(TPM2_CC_PCR_SETAUTHVAL), /* Command code */

		/* HANDLE */
		tpm_u32(index),			/* Handle (PCR Index) */

		/* AUTH_SESSION */
		tpm_u32(9 + pw_sz),		/* Authorization size */
		tpm_u32(TPM2_RS_PW),		/* session handle */
		tpm_u16(0),			/* Size of <nonce> */
						/* <nonce> (if any) */
		0,				/* Attributes: Cont/Excl/Rst */
		tpm_u16(pw_sz),			/* Size of <hmac/password> */
		/* STRING(pw)			   <hmac/password> (if any) */

		/* TPM2B_DIGEST */
		/* tpm_u16(key_sz)		   Key length */
		/* STRING(key)			   Key */
	};
	unsigned int offset = 27;
	int ret;

	/*
	 * Fill the command structure starting from the first buffer:
	 *     - the password (if any)
	 *     - the number of digests, 1 in our case
	 *     - the algorithm, sha256 in our case
	 *     - the digest (64 bytes)
	 */
	ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
			       offset, pw, pw_sz,
			       offset + pw_sz, key_sz,
			       offset + pw_sz + 2, key, key_sz);
	offset += pw_sz + 2 + key_sz;
	if (ret)
		return TPM_LIB_ERROR;

	return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

u32 tpm2_get_random(struct udevice *dev, void *data, u32 count)
{
	const u8 command_v2[10] = {
		tpm_u16(TPM2_ST_NO_SESSIONS),
		tpm_u32(12),
		tpm_u32(TPM2_CC_GET_RANDOM),
	};
	u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];

	const size_t data_size_offset = 10;
	const size_t data_offset = 12;
	size_t response_length = sizeof(response);
	u32 data_size;
	u8 *out = data;

	while (count > 0) {
		u32 this_bytes = min((size_t)count,
				     sizeof(response) - data_offset);
		u32 err;

		if (pack_byte_string(buf, sizeof(buf), "sw",
				     0, command_v2, sizeof(command_v2),
				     sizeof(command_v2), this_bytes))
			return TPM_LIB_ERROR;
		err = tpm_sendrecv_command(dev, buf, response,
					   &response_length);
		if (err)
			return err;
		if (unpack_byte_string(response, response_length, "w",
				       data_size_offset, &data_size))
			return TPM_LIB_ERROR;
		if (data_size > this_bytes)
			return TPM_LIB_ERROR;
		if (unpack_byte_string(response, response_length, "s",
				       data_offset, out, data_size))
			return TPM_LIB_ERROR;

		count -= data_size;
		out += data_size;
	}

	return 0;
}

u32 tpm2_write_lock(struct udevice *dev, u32 index)
{
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		/* header 10 bytes */
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(10 + 8 + 13), /* Length */
		tpm_u32(TPM2_CC_NV_WRITELOCK), /* Command code */

		/* handles 8 bytes */
		tpm_u32(TPM2_RH_PLATFORM),	/* Primary platform seed */
		tpm_u32(HR_NV_INDEX + index),	/* Password authorisation */

		/* session header 9 bytes */
		tpm_u32(9),			/* Header size */
		tpm_u32(TPM2_RS_PW),		/* Password authorisation */
		tpm_u16(0),			/* nonce_size */
		0,				/* session_attrs */
		tpm_u16(0),			/* auth_size */
	};

	return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
}

u32 tpm2_disable_platform_hierarchy(struct udevice *dev)
{
	struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
	u8 command_v2[COMMAND_BUFFER_SIZE] = {
		/* header 10 bytes */
		tpm_u16(TPM2_ST_SESSIONS),	/* TAG */
		tpm_u32(10 + 4 + 13 + 5),	/* Length */
		tpm_u32(TPM2_CC_HIER_CONTROL),	/* Command code */

		/* 4 bytes */
		tpm_u32(TPM2_RH_PLATFORM),	/* Primary platform seed */

		/* session header 9 bytes */
		tpm_u32(9),			/* Header size */
		tpm_u32(TPM2_RS_PW),		/* Password authorisation */
		tpm_u16(0),			/* nonce_size */
		0,				/* session_attrs */
		tpm_u16(0),			/* auth_size */

		/* payload 5 bytes */
		tpm_u32(TPM2_RH_PLATFORM),	/* Hierarchy to disable */
		0,				/* 0=disable */
	};
	int ret;

	ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
	log_info("ret=%s, %x\n", dev->name, ret);
	if (ret)
		return ret;

	priv->plat_hier_disabled = true;

	return 0;
}