2 * Copyright (c) 2013 The Chromium OS Authors.
3 * Coypright (c) 2013 Guntermann & Drunck GmbH
5 * SPDX-License-Identifier: GPL-2.0+
12 * Here is a partial implementation of TPM commands. Please consult TCG Main
13 * Specification for definitions of TPM commands.
16 #define TPM_HEADER_SIZE 10
27 enum tpm_startup_type
{
28 TPM_ST_CLEAR
= 0x0001,
29 TPM_ST_STATE
= 0x0002,
30 TPM_ST_DEACTIVATED
= 0x0003,
33 enum tpm_physical_presence
{
34 TPM_PHYSICAL_PRESENCE_HW_DISABLE
= 0x0200,
35 TPM_PHYSICAL_PRESENCE_CMD_DISABLE
= 0x0100,
36 TPM_PHYSICAL_PRESENCE_LIFETIME_LOCK
= 0x0080,
37 TPM_PHYSICAL_PRESENCE_HW_ENABLE
= 0x0040,
38 TPM_PHYSICAL_PRESENCE_CMD_ENABLE
= 0x0020,
39 TPM_PHYSICAL_PRESENCE_NOTPRESENT
= 0x0010,
40 TPM_PHYSICAL_PRESENCE_PRESENT
= 0x0008,
41 TPM_PHYSICAL_PRESENCE_LOCK
= 0x0004,
45 TPM_NV_INDEX_LOCK
= 0xffffffff,
46 TPM_NV_INDEX_0
= 0x00000000,
47 TPM_NV_INDEX_DIR
= 0x10000001,
50 enum tpm_resource_type
{
51 TPM_RT_KEY
= 0x00000001,
52 TPM_RT_AUTH
= 0x00000002,
53 TPM_RT_HASH
= 0x00000003,
54 TPM_RT_TRANS
= 0x00000004,
55 TPM_RT_CONTEXT
= 0x00000005,
56 TPM_RT_COUNTER
= 0x00000006,
57 TPM_RT_DELEGATE
= 0x00000007,
58 TPM_RT_DAA_TPM
= 0x00000008,
59 TPM_RT_DAA_V0
= 0x00000009,
60 TPM_RT_DAA_V1
= 0x0000000A,
63 enum tpm_capability_areas
{
64 TPM_CAP_ORD
= 0x00000001,
65 TPM_CAP_ALG
= 0x00000002,
66 TPM_CAP_PID
= 0x00000003,
67 TPM_CAP_FLAG
= 0x00000004,
68 TPM_CAP_PROPERTY
= 0x00000005,
69 TPM_CAP_VERSION
= 0x00000006,
70 TPM_CAP_KEY_HANDLE
= 0x00000007,
71 TPM_CAP_CHECK_LOADED
= 0x00000008,
72 TPM_CAP_SYM_MODE
= 0x00000009,
73 TPM_CAP_KEY_STATUS
= 0x0000000C,
74 TPM_CAP_NV_LIST
= 0x0000000D,
75 TPM_CAP_MFR
= 0x00000010,
76 TPM_CAP_NV_INDEX
= 0x00000011,
77 TPM_CAP_TRANS_ALG
= 0x00000012,
78 TPM_CAP_HANDLE
= 0x00000014,
79 TPM_CAP_TRANS_ES
= 0x00000015,
80 TPM_CAP_AUTH_ENCRYPT
= 0x00000017,
81 TPM_CAP_SELECT_SIZE
= 0x00000018,
82 TPM_CAP_DA_LOGIC
= 0x00000019,
83 TPM_CAP_VERSION_VAL
= 0x0000001A,
86 #define TPM_NV_PER_GLOBALLOCK (1U << 15)
87 #define TPM_NV_PER_PPREAD (1U << 16)
88 #define TPM_NV_PER_PPWRITE (1U << 0)
89 #define TPM_NV_PER_READ_STCLEAR (1U << 31)
90 #define TPM_NV_PER_WRITE_STCLEAR (1U << 14)
91 #define TPM_NV_PER_WRITEDEFINE (1U << 13)
92 #define TPM_NV_PER_WRITEALL (1U << 12)
99 * TPM return codes as defined in the TCG Main specification
100 * (TPM Main Part 2 Structures; Specification version 1.2)
102 enum tpm_return_code
{
103 TPM_BASE
= 0x00000000,
104 TPM_NON_FATAL
= 0x00000800,
105 TPM_SUCCESS
= TPM_BASE
,
106 /* TPM-defined fatal error codes */
107 TPM_AUTHFAIL
= TPM_BASE
+ 1,
108 TPM_BADINDEX
= TPM_BASE
+ 2,
109 TPM_BAD_PARAMETER
= TPM_BASE
+ 3,
110 TPM_AUDITFAILURE
= TPM_BASE
+ 4,
111 TPM_CLEAR_DISABLED
= TPM_BASE
+ 5,
112 TPM_DEACTIVATED
= TPM_BASE
+ 6,
113 TPM_DISABLED
= TPM_BASE
+ 7,
114 TPM_DISABLED_CMD
= TPM_BASE
+ 8,
115 TPM_FAIL
= TPM_BASE
+ 9,
116 TPM_BAD_ORDINAL
= TPM_BASE
+ 10,
117 TPM_INSTALL_DISABLED
= TPM_BASE
+ 11,
118 TPM_INVALID_KEYHANDLE
= TPM_BASE
+ 12,
119 TPM_KEYNOTFOUND
= TPM_BASE
+ 13,
120 TPM_INAPPROPRIATE_ENC
= TPM_BASE
+ 14,
121 TPM_MIGRATE_FAIL
= TPM_BASE
+ 15,
122 TPM_INVALID_PCR_INFO
= TPM_BASE
+ 16,
123 TPM_NOSPACE
= TPM_BASE
+ 17,
124 TPM_NOSRK
= TPM_BASE
+ 18,
125 TPM_NOTSEALED_BLOB
= TPM_BASE
+ 19,
126 TPM_OWNER_SET
= TPM_BASE
+ 20,
127 TPM_RESOURCES
= TPM_BASE
+ 21,
128 TPM_SHORTRANDOM
= TPM_BASE
+ 22,
129 TPM_SIZE
= TPM_BASE
+ 23,
130 TPM_WRONGPCRVAL
= TPM_BASE
+ 24,
131 TPM_BAD_PARAM_SIZE
= TPM_BASE
+ 25,
132 TPM_SHA_THREAD
= TPM_BASE
+ 26,
133 TPM_SHA_ERROR
= TPM_BASE
+ 27,
134 TPM_FAILEDSELFTEST
= TPM_BASE
+ 28,
135 TPM_AUTH2FAIL
= TPM_BASE
+ 29,
136 TPM_BADTAG
= TPM_BASE
+ 30,
137 TPM_IOERROR
= TPM_BASE
+ 31,
138 TPM_ENCRYPT_ERROR
= TPM_BASE
+ 32,
139 TPM_DECRYPT_ERROR
= TPM_BASE
+ 33,
140 TPM_INVALID_AUTHHANDLE
= TPM_BASE
+ 34,
141 TPM_NO_ENDORSEMENT
= TPM_BASE
+ 35,
142 TPM_INVALID_KEYUSAGE
= TPM_BASE
+ 36,
143 TPM_WRONG_ENTITYTYPE
= TPM_BASE
+ 37,
144 TPM_INVALID_POSTINIT
= TPM_BASE
+ 38,
145 TPM_INAPPROPRIATE_SIG
= TPM_BASE
+ 39,
146 TPM_BAD_KEY_PROPERTY
= TPM_BASE
+ 40,
147 TPM_BAD_MIGRATION
= TPM_BASE
+ 41,
148 TPM_BAD_SCHEME
= TPM_BASE
+ 42,
149 TPM_BAD_DATASIZE
= TPM_BASE
+ 43,
150 TPM_BAD_MODE
= TPM_BASE
+ 44,
151 TPM_BAD_PRESENCE
= TPM_BASE
+ 45,
152 TPM_BAD_VERSION
= TPM_BASE
+ 46,
153 TPM_NO_WRAP_TRANSPORT
= TPM_BASE
+ 47,
154 TPM_AUDITFAIL_UNSUCCESSFUL
= TPM_BASE
+ 48,
155 TPM_AUDITFAIL_SUCCESSFUL
= TPM_BASE
+ 49,
156 TPM_NOTRESETABLE
= TPM_BASE
+ 50,
157 TPM_NOTLOCAL
= TPM_BASE
+ 51,
158 TPM_BAD_TYPE
= TPM_BASE
+ 52,
159 TPM_INVALID_RESOURCE
= TPM_BASE
+ 53,
160 TPM_NOTFIPS
= TPM_BASE
+ 54,
161 TPM_INVALID_FAMILY
= TPM_BASE
+ 55,
162 TPM_NO_NV_PERMISSION
= TPM_BASE
+ 56,
163 TPM_REQUIRES_SIGN
= TPM_BASE
+ 57,
164 TPM_KEY_NOTSUPPORTED
= TPM_BASE
+ 58,
165 TPM_AUTH_CONFLICT
= TPM_BASE
+ 59,
166 TPM_AREA_LOCKED
= TPM_BASE
+ 60,
167 TPM_BAD_LOCALITY
= TPM_BASE
+ 61,
168 TPM_READ_ONLY
= TPM_BASE
+ 62,
169 TPM_PER_NOWRITE
= TPM_BASE
+ 63,
170 TPM_FAMILY_COUNT
= TPM_BASE
+ 64,
171 TPM_WRITE_LOCKED
= TPM_BASE
+ 65,
172 TPM_BAD_ATTRIBUTES
= TPM_BASE
+ 66,
173 TPM_INVALID_STRUCTURE
= TPM_BASE
+ 67,
174 TPM_KEY_OWNER_CONTROL
= TPM_BASE
+ 68,
175 TPM_BAD_COUNTER
= TPM_BASE
+ 69,
176 TPM_NOT_FULLWRITE
= TPM_BASE
+ 70,
177 TPM_CONTEXT_GAP
= TPM_BASE
+ 71,
178 TPM_MAXNVWRITES
= TPM_BASE
+ 72,
179 TPM_NOOPERATOR
= TPM_BASE
+ 73,
180 TPM_RESOURCEMISSING
= TPM_BASE
+ 74,
181 TPM_DELEGATE_LOCK
= TPM_BASE
+ 75,
182 TPM_DELEGATE_FAMILY
= TPM_BASE
+ 76,
183 TPM_DELEGATE_ADMIN
= TPM_BASE
+ 77,
184 TPM_TRANSPORT_NOTEXCLUSIVE
= TPM_BASE
+ 78,
185 TPM_OWNER_CONTROL
= TPM_BASE
+ 79,
186 TPM_DAA_RESOURCES
= TPM_BASE
+ 80,
187 TPM_DAA_INPUT_DATA0
= TPM_BASE
+ 81,
188 TPM_DAA_INPUT_DATA1
= TPM_BASE
+ 82,
189 TPM_DAA_ISSUER_SETTINGS
= TPM_BASE
+ 83,
190 TPM_DAA_TPM_SETTINGS
= TPM_BASE
+ 84,
191 TPM_DAA_STAGE
= TPM_BASE
+ 85,
192 TPM_DAA_ISSUER_VALIDITY
= TPM_BASE
+ 86,
193 TPM_DAA_WRONG_W
= TPM_BASE
+ 87,
194 TPM_BAD_HANDLE
= TPM_BASE
+ 88,
195 TPM_BAD_DELEGATE
= TPM_BASE
+ 89,
196 TPM_BADCONTEXT
= TPM_BASE
+ 90,
197 TPM_TOOMANYCONTEXTS
= TPM_BASE
+ 91,
198 TPM_MA_TICKET_SIGNATURE
= TPM_BASE
+ 92,
199 TPM_MA_DESTINATION
= TPM_BASE
+ 93,
200 TPM_MA_SOURCE
= TPM_BASE
+ 94,
201 TPM_MA_AUTHORITY
= TPM_BASE
+ 95,
202 TPM_PERMANENTEK
= TPM_BASE
+ 97,
203 TPM_BAD_SIGNATURE
= TPM_BASE
+ 98,
204 TPM_NOCONTEXTSPACE
= TPM_BASE
+ 99,
205 /* TPM-defined non-fatal errors */
206 TPM_RETRY
= TPM_BASE
+ TPM_NON_FATAL
,
207 TPM_NEEDS_SELFTEST
= TPM_BASE
+ TPM_NON_FATAL
+ 1,
208 TPM_DOING_SELFTEST
= TPM_BASE
+ TPM_NON_FATAL
+ 2,
209 TPM_DEFEND_LOCK_RUNNING
= TPM_BASE
+ TPM_NON_FATAL
+ 3,
212 struct tpm_permanent_flags
{
218 u8 disable_owner_clear
;
219 u8 allow_maintenance
;
220 u8 physical_presence_lifetime_lock
;
221 u8 physical_presence_hw_enable
;
222 u8 physical_presence_cmd_enable
;
233 u8 disable_full_da_logic_info
;
236 /* Max buffer size supported by our tpm */
237 #define TPM_DEV_BUFSIZE 1260
240 * struct tpm_chip_priv - Information about a TPM, stored by the uclass
242 * These values must be set up by the device's probe() method before
243 * communcation is attempted. If the device has an xfer() method, this is
244 * not needed. There is no need to set up @buf.
246 * @duration_ms: Length of each duration type in milliseconds
247 * @retry_time_ms: Time to wait before retrying receive
249 struct tpm_chip_priv
{
250 uint duration_ms
[TPM_DURATION_COUNT
];
252 u8 buf
[TPM_DEV_BUFSIZE
+ sizeof(u8
)]; /* Max buffer size + addr */
256 * struct tpm_ops - low-level TPM operations
258 * These are designed to avoid loops and delays in the driver itself. These
259 * should be handled in the uclass.
261 * In gneral you should implement everything except xfer(). Where you need
262 * complete control of the transfer, then xfer() can be provided and will
263 * override the other methods.
265 * This interface is for low-level TPM access. It does not understand the
266 * concept of localities or the various TPM messages. That interface is
267 * defined in the functions later on in this file, but they all translate
268 * to bytes which are sent and received.
272 * open() - Request access to locality 0 for the caller
274 * After all commands have been completed the caller should call
277 * @dev: Device to close
278 * @return 0 ok OK, -ve on error
280 int (*open
)(struct udevice
*dev
);
283 * close() - Close the current session
285 * Releasing the locked locality. Returns 0 on success, -ve 1 on
286 * failure (in case lock removal did not succeed).
288 * @dev: Device to close
289 * @return 0 ok OK, -ve on error
291 int (*close
)(struct udevice
*dev
);
294 * get_desc() - Get a text description of the TPM
296 * @dev: Device to check
297 * @buf: Buffer to put the string
298 * @size: Maximum size of buffer
299 * @return length of string, or -ENOSPC it no space
301 int (*get_desc
)(struct udevice
*dev
, char *buf
, int size
);
304 * send() - send data to the TPM
306 * @dev: Device to talk to
307 * @sendbuf: Buffer of the data to send
308 * @send_size: Size of the data to send
310 * Returns 0 on success or -ve on failure.
312 int (*send
)(struct udevice
*dev
, const uint8_t *sendbuf
,
316 * recv() - receive a response from the TPM
318 * @dev: Device to talk to
319 * @recvbuf: Buffer to save the response to
320 * @max_size: Maximum number of bytes to receive
322 * Returns number of bytes received on success, -EAGAIN if the TPM
323 * response is not ready, -EINTR if cancelled, or other -ve value on
326 int (*recv
)(struct udevice
*dev
, uint8_t *recvbuf
, size_t max_size
);
329 * cleanup() - clean up after an operation in progress
331 * This is called if receiving times out. The TPM may need to abort
332 * the current transaction if it did not complete, and make itself
335 * @dev: Device to talk to
337 int (*cleanup
)(struct udevice
*dev
);
340 * xfer() - send data to the TPM and get response
342 * This method is optional. If it exists it is used in preference
343 * to send(), recv() and cleanup(). It should handle all aspects of
344 * TPM communication for a single transfer.
346 * @dev: Device to talk to
347 * @sendbuf: Buffer of the data to send
348 * @send_size: Size of the data to send
349 * @recvbuf: Buffer to save the response to
350 * @recv_size: Pointer to the size of the response buffer
352 * Returns 0 on success (and places the number of response bytes at
353 * recv_size) or -ve on failure.
355 int (*xfer
)(struct udevice
*dev
, const uint8_t *sendbuf
,
356 size_t send_size
, uint8_t *recvbuf
, size_t *recv_size
);
359 #define tpm_get_ops(dev) ((struct tpm_ops *)device_get_ops(dev))
362 * tpm_open() - Request access to locality 0 for the caller
364 * After all commands have been completed the caller is supposed to
367 * Returns 0 on success, -ve on failure.
369 int tpm_open(struct udevice
*dev
);
372 * tpm_close() - Close the current session
374 * Releasing the locked locality. Returns 0 on success, -ve 1 on
375 * failure (in case lock removal did not succeed).
377 int tpm_close(struct udevice
*dev
);
380 * tpm_get_desc() - Get a text description of the TPM
382 * @dev: Device to check
383 * @buf: Buffer to put the string
384 * @size: Maximum size of buffer
385 * @return length of string, or -ENOSPC it no space
387 int tpm_get_desc(struct udevice
*dev
, char *buf
, int size
);
390 * tpm_xfer() - send data to the TPM and get response
392 * This first uses the device's send() method to send the bytes. Then it calls
393 * recv() to get the reply. If recv() returns -EAGAIN then it will delay a
394 * short time and then call recv() again.
396 * Regardless of whether recv() completes successfully, it will then call
397 * cleanup() to finish the transaction.
399 * Note that the outgoing data is inspected to determine command type
400 * (ordinal) and a timeout is used for that command type.
402 * @sendbuf - buffer of the data to send
403 * @send_size size of the data to send
404 * @recvbuf - memory to save the response to
405 * @recv_len - pointer to the size of the response buffer
407 * Returns 0 on success (and places the number of response bytes at
408 * recv_len) or -ve on failure.
410 int tpm_xfer(struct udevice
*dev
, const uint8_t *sendbuf
, size_t send_size
,
411 uint8_t *recvbuf
, size_t *recv_size
);
414 * Initialize TPM device. It must be called before any TPM commands.
416 * @return 0 on success, non-0 on error.
421 * Issue a TPM_Startup command.
423 * @param mode TPM startup mode
424 * @return return code of the operation
426 uint32_t tpm_startup(enum tpm_startup_type mode
);
429 * Issue a TPM_SelfTestFull command.
431 * @return return code of the operation
433 uint32_t tpm_self_test_full(void);
436 * Issue a TPM_ContinueSelfTest command.
438 * @return return code of the operation
440 uint32_t tpm_continue_self_test(void);
443 * Issue a TPM_NV_DefineSpace command. The implementation is limited
444 * to specify TPM_NV_ATTRIBUTES and size of the area. The area index
445 * could be one of the special value listed in enum tpm_nv_index.
447 * @param index index of the area
448 * @param perm TPM_NV_ATTRIBUTES of the area
449 * @param size size of the area
450 * @return return code of the operation
452 uint32_t tpm_nv_define_space(uint32_t index
, uint32_t perm
, uint32_t size
);
455 * Issue a TPM_NV_ReadValue command. This implementation is limited
456 * to read the area from offset 0. The area index could be one of
457 * the special value listed in enum tpm_nv_index.
459 * @param index index of the area
460 * @param data output buffer of the area contents
461 * @param count size of output buffer
462 * @return return code of the operation
464 uint32_t tpm_nv_read_value(uint32_t index
, void *data
, uint32_t count
);
467 * Issue a TPM_NV_WriteValue command. This implementation is limited
468 * to write the area from offset 0. The area index could be one of
469 * the special value listed in enum tpm_nv_index.
471 * @param index index of the area
472 * @param data input buffer to be wrote to the area
473 * @param length length of data bytes of input buffer
474 * @return return code of the operation
476 uint32_t tpm_nv_write_value(uint32_t index
, const void *data
, uint32_t length
);
479 * Issue a TPM_Extend command.
481 * @param index index of the PCR
482 * @param in_digest 160-bit value representing the event to be
484 * @param out_digest 160-bit PCR value after execution of the
486 * @return return code of the operation
488 uint32_t tpm_extend(uint32_t index
, const void *in_digest
, void *out_digest
);
491 * Issue a TPM_PCRRead command.
493 * @param index index of the PCR
494 * @param data output buffer for contents of the named PCR
495 * @param count size of output buffer
496 * @return return code of the operation
498 uint32_t tpm_pcr_read(uint32_t index
, void *data
, size_t count
);
501 * Issue a TSC_PhysicalPresence command. TPM physical presence flag
502 * is bit-wise OR'ed of flags listed in enum tpm_physical_presence.
504 * @param presence TPM physical presence flag
505 * @return return code of the operation
507 uint32_t tpm_tsc_physical_presence(uint16_t presence
);
510 * Issue a TPM_ReadPubek command.
512 * @param data output buffer for the public endorsement key
513 * @param count size of ouput buffer
514 * @return return code of the operation
516 uint32_t tpm_read_pubek(void *data
, size_t count
);
519 * Issue a TPM_ForceClear command.
521 * @return return code of the operation
523 uint32_t tpm_force_clear(void);
526 * Issue a TPM_PhysicalEnable command.
528 * @return return code of the operation
530 uint32_t tpm_physical_enable(void);
533 * Issue a TPM_PhysicalDisable command.
535 * @return return code of the operation
537 uint32_t tpm_physical_disable(void);
540 * Issue a TPM_PhysicalSetDeactivated command.
542 * @param state boolean state of the deactivated flag
543 * @return return code of the operation
545 uint32_t tpm_physical_set_deactivated(uint8_t state
);
548 * Issue a TPM_GetCapability command. This implementation is limited
549 * to query sub_cap index that is 4-byte wide.
551 * @param cap_area partition of capabilities
552 * @param sub_cap further definition of capability, which is
553 * limited to be 4-byte wide
554 * @param cap output buffer for capability information
555 * @param count size of ouput buffer
556 * @return return code of the operation
558 uint32_t tpm_get_capability(uint32_t cap_area
, uint32_t sub_cap
,
559 void *cap
, size_t count
);
562 * Issue a TPM_FlushSpecific command for a AUTH ressource.
564 * @param auth_handle handle of the auth session
565 * @return return code of the operation
567 uint32_t tpm_terminate_auth_session(uint32_t auth_handle
);
570 * Issue a TPM_OIAP command to setup an object independant authorization
572 * Information about the session is stored internally.
573 * If there was already an OIAP session active it is terminated and a new
576 * @param auth_handle pointer to the (new) auth handle or NULL.
577 * @return return code of the operation
579 uint32_t tpm_oiap(uint32_t *auth_handle
);
582 * Ends an active OIAP session.
584 * @return return code of the operation
586 uint32_t tpm_end_oiap(void);
589 * Issue a TPM_LoadKey2 (Auth1) command using an OIAP session for authenticating
590 * the usage of the parent key.
592 * @param parent_handle handle of the parent key.
593 * @param key pointer to the key structure (TPM_KEY or TPM_KEY12).
594 * @param key_length size of the key structure
595 * @param parent_key_usage_auth usage auth for the parent key
596 * @param key_handle pointer to the key handle
597 * @return return code of the operation
599 uint32_t tpm_load_key2_oiap(uint32_t parent_handle
,
600 const void *key
, size_t key_length
,
601 const void *parent_key_usage_auth
,
602 uint32_t *key_handle
);
605 * Issue a TPM_GetPubKey (Auth1) command using an OIAP session for
606 * authenticating the usage of the key.
608 * @param key_handle handle of the key
609 * @param usage_auth usage auth for the key
610 * @param pubkey pointer to the pub key buffer; may be NULL if the pubkey
611 * should not be stored.
612 * @param pubkey_len pointer to the pub key buffer len. On entry: the size of
613 * the provided pubkey buffer. On successful exit: the size
614 * of the stored TPM_PUBKEY structure (iff pubkey != NULL).
615 * @return return code of the operation
617 uint32_t tpm_get_pub_key_oiap(uint32_t key_handle
, const void *usage_auth
,
618 void *pubkey
, size_t *pubkey_len
);
621 * Get the TPM permanent flags value
623 * @param pflags Place to put permanent flags
624 * @return return code of the operation
626 uint32_t tpm_get_permanent_flags(struct tpm_permanent_flags
*pflags
);
629 * Get the TPM permissions
631 * @param perm Returns permissions value
632 * @return return code of the operation
634 uint32_t tpm_get_permissions(uint32_t index
, uint32_t *perm
);
637 * Flush a resource with a given handle and type from the TPM
639 * @param key_handle handle of the resource
640 * @param resource_type type of the resource
641 * @return return code of the operation
643 uint32_t tpm_flush_specific(uint32_t key_handle
, uint32_t resource_type
);
645 #ifdef CONFIG_TPM_LOAD_KEY_BY_SHA1
647 * Search for a key by usage AuthData and the hash of the parent's pub key.
649 * @param auth Usage auth of the key to search for
650 * @param pubkey_digest SHA1 hash of the pub key structure of the key
651 * @param[out] handle The handle of the key (Non-null iff found)
652 * @return 0 if key was found in TPM; != 0 if not.
654 uint32_t tpm_find_key_sha1(const uint8_t auth
[20], const uint8_t
655 pubkey_digest
[20], uint32_t *handle
);
656 #endif /* CONFIG_TPM_LOAD_KEY_BY_SHA1 */
659 * Read random bytes from the TPM RNG. The implementation deals with the fact
660 * that the TPM may legally return fewer bytes than requested by retrying
661 * until @p count bytes have been received.
663 * @param data output buffer for the random bytes
664 * @param count size of output buffer
665 * @return return code of the operation
667 uint32_t tpm_get_random(void *data
, uint32_t count
);