include/tpm.h

   1 /*
   2  * Copyright (c) 2013 The Chromium OS Authors.
   3  * Coypright (c) 2013 Guntermann & Drunck GmbH
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #ifndef __TPM_H
   9 #define __TPM_H
  10
  11 #include <tis.h>
  12
  13 /*
  14  * Here is a partial implementation of TPM commands.  Please consult TCG Main
  15  * Specification for definitions of TPM commands.
  16  */
  17
  18 #define TPM_HEADER_SIZE         10
  19
  20 enum tpm_duration {
  21         TPM_SHORT = 0,
  22         TPM_MEDIUM = 1,
  23         TPM_LONG = 2,
  24         TPM_UNDEFINED,
  25
  26         TPM_DURATION_COUNT,
  27 };
  28
  29 enum tpm_startup_type {
  30         TPM_ST_CLEAR            = 0x0001,
  31         TPM_ST_STATE            = 0x0002,
  32         TPM_ST_DEACTIVATED      = 0x0003,
  33 };
  34
  35 enum tpm_physical_presence {
  36         TPM_PHYSICAL_PRESENCE_HW_DISABLE        = 0x0200,
  37         TPM_PHYSICAL_PRESENCE_CMD_DISABLE       = 0x0100,
  38         TPM_PHYSICAL_PRESENCE_LIFETIME_LOCK     = 0x0080,
  39         TPM_PHYSICAL_PRESENCE_HW_ENABLE         = 0x0040,
  40         TPM_PHYSICAL_PRESENCE_CMD_ENABLE        = 0x0020,
  41         TPM_PHYSICAL_PRESENCE_NOTPRESENT        = 0x0010,
  42         TPM_PHYSICAL_PRESENCE_PRESENT           = 0x0008,
  43         TPM_PHYSICAL_PRESENCE_LOCK              = 0x0004,
  44 };
  45
  46 enum tpm_nv_index {
  47         TPM_NV_INDEX_LOCK       = 0xffffffff,
  48         TPM_NV_INDEX_0          = 0x00000000,
  49         TPM_NV_INDEX_DIR        = 0x10000001,
  50 };
  51
  52 #define TPM_NV_PER_GLOBALLOCK           (1U << 15)
  53 #define TPM_NV_PER_PPWRITE              (1U << 0)
  54 #define TPM_NV_PER_READ_STCLEAR         (1U << 31)
  55 #define TPM_NV_PER_WRITE_STCLEAR        (1U << 14)
  56
  57 enum {
  58         TPM_PUBEK_SIZE                  = 256,
  59 };
  60
  61 /**
  62  * TPM return codes as defined in the TCG Main specification
  63  * (TPM Main Part 2 Structures; Specification version 1.2)
  64  */
  65 enum tpm_return_code {
  66         TPM_BASE        = 0x00000000,
  67         TPM_NON_FATAL   = 0x00000800,
  68         TPM_SUCCESS     = TPM_BASE,
  69         /* TPM-defined fatal error codes */
  70         TPM_AUTHFAIL                    = TPM_BASE +  1,
  71         TPM_BADINDEX                    = TPM_BASE +  2,
  72         TPM_BAD_PARAMETER               = TPM_BASE +  3,
  73         TPM_AUDITFAILURE                = TPM_BASE +  4,
  74         TPM_CLEAR_DISABLED              = TPM_BASE +  5,
  75         TPM_DEACTIVATED                 = TPM_BASE +  6,
  76         TPM_DISABLED                    = TPM_BASE +  7,
  77         TPM_DISABLED_CMD                = TPM_BASE +  8,
  78         TPM_FAIL                        = TPM_BASE +  9,
  79         TPM_BAD_ORDINAL                 = TPM_BASE + 10,
  80         TPM_INSTALL_DISABLED            = TPM_BASE + 11,
  81         TPM_INVALID_KEYHANDLE           = TPM_BASE + 12,
  82         TPM_KEYNOTFOUND                 = TPM_BASE + 13,
  83         TPM_INAPPROPRIATE_ENC           = TPM_BASE + 14,
  84         TPM_MIGRATE_FAIL                = TPM_BASE + 15,
  85         TPM_INVALID_PCR_INFO            = TPM_BASE + 16,
  86         TPM_NOSPACE                     = TPM_BASE + 17,
  87         TPM_NOSRK                       = TPM_BASE + 18,
  88         TPM_NOTSEALED_BLOB              = TPM_BASE + 19,
  89         TPM_OWNER_SET                   = TPM_BASE + 20,
  90         TPM_RESOURCES                   = TPM_BASE + 21,
  91         TPM_SHORTRANDOM                 = TPM_BASE + 22,
  92         TPM_SIZE                        = TPM_BASE + 23,
  93         TPM_WRONGPCRVAL                 = TPM_BASE + 24,
  94         TPM_BAD_PARAM_SIZE              = TPM_BASE + 25,
  95         TPM_SHA_THREAD                  = TPM_BASE + 26,
  96         TPM_SHA_ERROR                   = TPM_BASE + 27,
  97         TPM_FAILEDSELFTEST              = TPM_BASE + 28,
  98         TPM_AUTH2FAIL                   = TPM_BASE + 29,
  99         TPM_BADTAG                      = TPM_BASE + 30,
 100         TPM_IOERROR                     = TPM_BASE + 31,
 101         TPM_ENCRYPT_ERROR               = TPM_BASE + 32,
 102         TPM_DECRYPT_ERROR               = TPM_BASE + 33,
 103         TPM_INVALID_AUTHHANDLE          = TPM_BASE + 34,
 104         TPM_NO_ENDORSEMENT              = TPM_BASE + 35,
 105         TPM_INVALID_KEYUSAGE            = TPM_BASE + 36,
 106         TPM_WRONG_ENTITYTYPE            = TPM_BASE + 37,
 107         TPM_INVALID_POSTINIT            = TPM_BASE + 38,
 108         TPM_INAPPROPRIATE_SIG           = TPM_BASE + 39,
 109         TPM_BAD_KEY_PROPERTY            = TPM_BASE + 40,
 110         TPM_BAD_MIGRATION               = TPM_BASE + 41,
 111         TPM_BAD_SCHEME                  = TPM_BASE + 42,
 112         TPM_BAD_DATASIZE                = TPM_BASE + 43,
 113         TPM_BAD_MODE                    = TPM_BASE + 44,
 114         TPM_BAD_PRESENCE                = TPM_BASE + 45,
 115         TPM_BAD_VERSION                 = TPM_BASE + 46,
 116         TPM_NO_WRAP_TRANSPORT           = TPM_BASE + 47,
 117         TPM_AUDITFAIL_UNSUCCESSFUL      = TPM_BASE + 48,
 118         TPM_AUDITFAIL_SUCCESSFUL        = TPM_BASE + 49,
 119         TPM_NOTRESETABLE                = TPM_BASE + 50,
 120         TPM_NOTLOCAL                    = TPM_BASE + 51,
 121         TPM_BAD_TYPE                    = TPM_BASE + 52,
 122         TPM_INVALID_RESOURCE            = TPM_BASE + 53,
 123         TPM_NOTFIPS                     = TPM_BASE + 54,
 124         TPM_INVALID_FAMILY              = TPM_BASE + 55,
 125         TPM_NO_NV_PERMISSION            = TPM_BASE + 56,
 126         TPM_REQUIRES_SIGN               = TPM_BASE + 57,
 127         TPM_KEY_NOTSUPPORTED            = TPM_BASE + 58,
 128         TPM_AUTH_CONFLICT               = TPM_BASE + 59,
 129         TPM_AREA_LOCKED                 = TPM_BASE + 60,
 130         TPM_BAD_LOCALITY                = TPM_BASE + 61,
 131         TPM_READ_ONLY                   = TPM_BASE + 62,
 132         TPM_PER_NOWRITE                 = TPM_BASE + 63,
 133         TPM_FAMILY_COUNT                = TPM_BASE + 64,
 134         TPM_WRITE_LOCKED                = TPM_BASE + 65,
 135         TPM_BAD_ATTRIBUTES              = TPM_BASE + 66,
 136         TPM_INVALID_STRUCTURE           = TPM_BASE + 67,
 137         TPM_KEY_OWNER_CONTROL           = TPM_BASE + 68,
 138         TPM_BAD_COUNTER                 = TPM_BASE + 69,
 139         TPM_NOT_FULLWRITE               = TPM_BASE + 70,
 140         TPM_CONTEXT_GAP                 = TPM_BASE + 71,
 141         TPM_MAXNVWRITES                 = TPM_BASE + 72,
 142         TPM_NOOPERATOR                  = TPM_BASE + 73,
 143         TPM_RESOURCEMISSING             = TPM_BASE + 74,
 144         TPM_DELEGATE_LOCK               = TPM_BASE + 75,
 145         TPM_DELEGATE_FAMILY             = TPM_BASE + 76,
 146         TPM_DELEGATE_ADMIN              = TPM_BASE + 77,
 147         TPM_TRANSPORT_NOTEXCLUSIVE      = TPM_BASE + 78,
 148         TPM_OWNER_CONTROL               = TPM_BASE + 79,
 149         TPM_DAA_RESOURCES               = TPM_BASE + 80,
 150         TPM_DAA_INPUT_DATA0             = TPM_BASE + 81,
 151         TPM_DAA_INPUT_DATA1             = TPM_BASE + 82,
 152         TPM_DAA_ISSUER_SETTINGS         = TPM_BASE + 83,
 153         TPM_DAA_TPM_SETTINGS            = TPM_BASE + 84,
 154         TPM_DAA_STAGE                   = TPM_BASE + 85,
 155         TPM_DAA_ISSUER_VALIDITY         = TPM_BASE + 86,
 156         TPM_DAA_WRONG_W                 = TPM_BASE + 87,
 157         TPM_BAD_HANDLE                  = TPM_BASE + 88,
 158         TPM_BAD_DELEGATE                = TPM_BASE + 89,
 159         TPM_BADCONTEXT                  = TPM_BASE + 90,
 160         TPM_TOOMANYCONTEXTS             = TPM_BASE + 91,
 161         TPM_MA_TICKET_SIGNATURE         = TPM_BASE + 92,
 162         TPM_MA_DESTINATION              = TPM_BASE + 93,
 163         TPM_MA_SOURCE                   = TPM_BASE + 94,
 164         TPM_MA_AUTHORITY                = TPM_BASE + 95,
 165         TPM_PERMANENTEK                 = TPM_BASE + 97,
 166         TPM_BAD_SIGNATURE               = TPM_BASE + 98,
 167         TPM_NOCONTEXTSPACE              = TPM_BASE + 99,
 168         /* TPM-defined non-fatal errors */
 169         TPM_RETRY               = TPM_BASE + TPM_NON_FATAL,
 170         TPM_NEEDS_SELFTEST      = TPM_BASE + TPM_NON_FATAL + 1,
 171         TPM_DOING_SELFTEST      = TPM_BASE + TPM_NON_FATAL + 2,
 172         TPM_DEFEND_LOCK_RUNNING = TPM_BASE + TPM_NON_FATAL + 3,
 173 };
 174
 175 struct tpm_permanent_flags {
 176         __be16  tag;
 177         u8      disable;
 178         u8      ownership;
 179         u8      deactivated;
 180         u8      read_pubek;
 181         u8      disable_owner_clear;
 182         u8      allow_maintenance;
 183         u8      physical_presence_lifetime_lock;
 184         u8      physical_presence_hw_enable;
 185         u8      physical_presence_cmd_enable;
 186         u8      cekp_used;
 187         u8      tpm_post;
 188         u8      tpm_post_lock;
 189         u8      fips;
 190         u8      operator;
 191         u8      enable_revoke_ek;
 192         u8      nv_locked;
 193         u8      read_srk_pub;
 194         u8      tpm_established;
 195         u8      maintenance_done;
 196         u8      disable_full_da_logic_info;
 197 } __packed;
 198
 199 #ifdef CONFIG_DM_TPM
 200
 201 /* Max buffer size supported by our tpm */
 202 #define TPM_DEV_BUFSIZE         1260
 203
 204 /**
 205  * struct tpm_chip_priv - Information about a TPM, stored by the uclass
 206  *
 207  * These values must be set up by the device's probe() method before
 208  * communcation is attempted. If the device has an xfer() method, this is
 209  * not needed. There is no need to set up @buf.
 210  *
 211  * @duration_ms:        Length of each duration type in milliseconds
 212  * @retry_time_ms:      Time to wait before retrying receive
 213  */
 214 struct tpm_chip_priv {
 215         uint duration_ms[TPM_DURATION_COUNT];
 216         uint retry_time_ms;
 217         u8 buf[TPM_DEV_BUFSIZE + sizeof(u8)];  /* Max buffer size + addr */
 218 };
 219
 220 /**
 221  * struct tpm_ops - low-level TPM operations
 222  *
 223  * These are designed to avoid loops and delays in the driver itself. These
 224  * should be handled in the uclass.
 225  *
 226  * In gneral you should implement everything except xfer(). Where you need
 227  * complete control of the transfer, then xfer() can be provided and will
 228  * override the other methods.
 229  *
 230  * This interface is for low-level TPM access. It does not understand the
 231  * concept of localities or the various TPM messages. That interface is
 232  * defined in the functions later on in this file, but they all translate
 233  * to bytes which are sent and received.
 234  */
 235 struct tpm_ops {
 236         /**
 237          * open() - Request access to locality 0 for the caller
 238          *
 239          * After all commands have been completed the caller should call
 240          * close().
 241          *
 242          * @dev:        Device to close
 243          * @return 0 ok OK, -ve on error
 244          */
 245         int (*open)(struct udevice *dev);
 246
 247         /**
 248          * close() - Close the current session
 249          *
 250          * Releasing the locked locality. Returns 0 on success, -ve 1 on
 251          * failure (in case lock removal did not succeed).
 252          *
 253          * @dev:        Device to close
 254          * @return 0 ok OK, -ve on error
 255          */
 256         int (*close)(struct udevice *dev);
 257
 258         /**
 259          * get_desc() - Get a text description of the TPM
 260          *
 261          * @dev:        Device to check
 262          * @buf:        Buffer to put the string
 263          * @size:       Maximum size of buffer
 264          * @return length of string, or -ENOSPC it no space
 265          */
 266         int (*get_desc)(struct udevice *dev, char *buf, int size);
 267
 268         /**
 269          * send() - send data to the TPM
 270          *
 271          * @dev:        Device to talk to
 272          * @sendbuf:    Buffer of the data to send
 273          * @send_size:  Size of the data to send
 274          *
 275          * Returns 0 on success or -ve on failure.
 276          */
 277         int (*send)(struct udevice *dev, const uint8_t *sendbuf,
 278                     size_t send_size);
 279
 280         /**
 281          * recv() - receive a response from the TPM
 282          *
 283          * @dev:        Device to talk to
 284          * @recvbuf:    Buffer to save the response to
 285          * @max_size:   Maximum number of bytes to receive
 286          *
 287          * Returns number of bytes received on success, -EAGAIN if the TPM
 288          * response is not ready, -EINTR if cancelled, or other -ve value on
 289          * failure.
 290          */
 291         int (*recv)(struct udevice *dev, uint8_t *recvbuf, size_t max_size);
 292
 293         /**
 294          * cleanup() - clean up after an operation in progress
 295          *
 296          * This is called if receiving times out. The TPM may need to abort
 297          * the current transaction if it did not complete, and make itself
 298          * ready for another.
 299          *
 300          * @dev:        Device to talk to
 301          */
 302         int (*cleanup)(struct udevice *dev);
 303
 304         /**
 305          * xfer() - send data to the TPM and get response
 306          *
 307          * This method is optional. If it exists it is used in preference
 308          * to send(), recv() and cleanup(). It should handle all aspects of
 309          * TPM communication for a single transfer.
 310          *
 311          * @dev:        Device to talk to
 312          * @sendbuf:    Buffer of the data to send
 313          * @send_size:  Size of the data to send
 314          * @recvbuf:    Buffer to save the response to
 315          * @recv_size:  Pointer to the size of the response buffer
 316          *
 317          * Returns 0 on success (and places the number of response bytes at
 318          * recv_size) or -ve on failure.
 319          */
 320         int (*xfer)(struct udevice *dev, const uint8_t *sendbuf,
 321                     size_t send_size, uint8_t *recvbuf, size_t *recv_size);
 322 };
 323
 324 #define tpm_get_ops(dev)        ((struct tpm_ops *)device_get_ops(dev))
 325
 326 /**
 327  * tpm_open() - Request access to locality 0 for the caller
 328  *
 329  * After all commands have been completed the caller is supposed to
 330  * call tpm_close().
 331  *
 332  * Returns 0 on success, -ve on failure.
 333  */
 334 int tpm_open(struct udevice *dev);
 335
 336 /**
 337  * tpm_close() - Close the current session
 338  *
 339  * Releasing the locked locality. Returns 0 on success, -ve 1 on
 340  * failure (in case lock removal did not succeed).
 341  */
 342 int tpm_close(struct udevice *dev);
 343
 344 /**
 345  * tpm_get_desc() - Get a text description of the TPM
 346  *
 347  * @dev:        Device to check
 348  * @buf:        Buffer to put the string
 349  * @size:       Maximum size of buffer
 350  * @return length of string, or -ENOSPC it no space
 351  */
 352 int tpm_get_desc(struct udevice *dev, char *buf, int size);
 353
 354 /**
 355  * tpm_xfer() - send data to the TPM and get response
 356  *
 357  * This first uses the device's send() method to send the bytes. Then it calls
 358  * recv() to get the reply. If recv() returns -EAGAIN then it will delay a
 359  * short time and then call recv() again.
 360  *
 361  * Regardless of whether recv() completes successfully, it will then call
 362  * cleanup() to finish the transaction.
 363  *
 364  * Note that the outgoing data is inspected to determine command type
 365  * (ordinal) and a timeout is used for that command type.
 366  *
 367  * @sendbuf - buffer of the data to send
 368  * @send_size size of the data to send
 369  * @recvbuf - memory to save the response to
 370  * @recv_len - pointer to the size of the response buffer
 371  *
 372  * Returns 0 on success (and places the number of response bytes at
 373  * recv_len) or -ve on failure.
 374  */
 375 int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size,
 376              uint8_t *recvbuf, size_t *recv_size);
 377
 378 #endif /* CONFIG_DM_TPM */
 379
 380 /**
 381  * Initialize TPM device.  It must be called before any TPM commands.
 382  *
 383  * @return 0 on success, non-0 on error.
 384  */
 385 int tpm_init(void);
 386
 387 /**
 388  * Issue a TPM_Startup command.
 389  *
 390  * @param mode          TPM startup mode
 391  * @return return code of the operation
 392  */
 393 uint32_t tpm_startup(enum tpm_startup_type mode);
 394
 395 /**
 396  * Issue a TPM_SelfTestFull command.
 397  *
 398  * @return return code of the operation
 399  */
 400 uint32_t tpm_self_test_full(void);
 401
 402 /**
 403  * Issue a TPM_ContinueSelfTest command.
 404  *
 405  * @return return code of the operation
 406  */
 407 uint32_t tpm_continue_self_test(void);
 408
 409 /**
 410  * Issue a TPM_NV_DefineSpace command.  The implementation is limited
 411  * to specify TPM_NV_ATTRIBUTES and size of the area.  The area index
 412  * could be one of the special value listed in enum tpm_nv_index.
 413  *
 414  * @param index         index of the area
 415  * @param perm          TPM_NV_ATTRIBUTES of the area
 416  * @param size          size of the area
 417  * @return return code of the operation
 418  */
 419 uint32_t tpm_nv_define_space(uint32_t index, uint32_t perm, uint32_t size);
 420
 421 /**
 422  * Issue a TPM_NV_ReadValue command.  This implementation is limited
 423  * to read the area from offset 0.  The area index could be one of
 424  * the special value listed in enum tpm_nv_index.
 425  *
 426  * @param index         index of the area
 427  * @param data          output buffer of the area contents
 428  * @param count         size of output buffer
 429  * @return return code of the operation
 430  */
 431 uint32_t tpm_nv_read_value(uint32_t index, void *data, uint32_t count);
 432
 433 /**
 434  * Issue a TPM_NV_WriteValue command.  This implementation is limited
 435  * to write the area from offset 0.  The area index could be one of
 436  * the special value listed in enum tpm_nv_index.
 437  *
 438  * @param index         index of the area
 439  * @param data          input buffer to be wrote to the area
 440  * @param length        length of data bytes of input buffer
 441  * @return return code of the operation
 442  */
 443 uint32_t tpm_nv_write_value(uint32_t index, const void *data, uint32_t length);
 444
 445 /**
 446  * Issue a TPM_Extend command.
 447  *
 448  * @param index         index of the PCR
 449  * @param in_digest     160-bit value representing the event to be
 450  *                      recorded
 451  * @param out_digest    160-bit PCR value after execution of the
 452  *                      command
 453  * @return return code of the operation
 454  */
 455 uint32_t tpm_extend(uint32_t index, const void *in_digest, void *out_digest);
 456
 457 /**
 458  * Issue a TPM_PCRRead command.
 459  *
 460  * @param index         index of the PCR
 461  * @param data          output buffer for contents of the named PCR
 462  * @param count         size of output buffer
 463  * @return return code of the operation
 464  */
 465 uint32_t tpm_pcr_read(uint32_t index, void *data, size_t count);
 466
 467 /**
 468  * Issue a TSC_PhysicalPresence command.  TPM physical presence flag
 469  * is bit-wise OR'ed of flags listed in enum tpm_physical_presence.
 470  *
 471  * @param presence      TPM physical presence flag
 472  * @return return code of the operation
 473  */
 474 uint32_t tpm_tsc_physical_presence(uint16_t presence);
 475
 476 /**
 477  * Issue a TPM_ReadPubek command.
 478  *
 479  * @param data          output buffer for the public endorsement key
 480  * @param count         size of ouput buffer
 481  * @return return code of the operation
 482  */
 483 uint32_t tpm_read_pubek(void *data, size_t count);
 484
 485 /**
 486  * Issue a TPM_ForceClear command.
 487  *
 488  * @return return code of the operation
 489  */
 490 uint32_t tpm_force_clear(void);
 491
 492 /**
 493  * Issue a TPM_PhysicalEnable command.
 494  *
 495  * @return return code of the operation
 496  */
 497 uint32_t tpm_physical_enable(void);
 498
 499 /**
 500  * Issue a TPM_PhysicalDisable command.
 501  *
 502  * @return return code of the operation
 503  */
 504 uint32_t tpm_physical_disable(void);
 505
 506 /**
 507  * Issue a TPM_PhysicalSetDeactivated command.
 508  *
 509  * @param state         boolean state of the deactivated flag
 510  * @return return code of the operation
 511  */
 512 uint32_t tpm_physical_set_deactivated(uint8_t state);
 513
 514 /**
 515  * Issue a TPM_GetCapability command.  This implementation is limited
 516  * to query sub_cap index that is 4-byte wide.
 517  *
 518  * @param cap_area      partition of capabilities
 519  * @param sub_cap       further definition of capability, which is
 520  *                      limited to be 4-byte wide
 521  * @param cap           output buffer for capability information
 522  * @param count         size of ouput buffer
 523  * @return return code of the operation
 524  */
 525 uint32_t tpm_get_capability(uint32_t cap_area, uint32_t sub_cap,
 526                 void *cap, size_t count);
 527
 528 /**
 529  * Issue a TPM_FlushSpecific command for a AUTH ressource.
 530  *
 531  * @param auth_handle   handle of the auth session
 532  * @return return code of the operation
 533  */
 534 uint32_t tpm_terminate_auth_session(uint32_t auth_handle);
 535
 536 /**
 537  * Issue a TPM_OIAP command to setup an object independant authorization
 538  * session.
 539  * Information about the session is stored internally.
 540  * If there was already an OIAP session active it is terminated and a new
 541  * session is set up.
 542  *
 543  * @param auth_handle   pointer to the (new) auth handle or NULL.
 544  * @return return code of the operation
 545  */
 546 uint32_t tpm_oiap(uint32_t *auth_handle);
 547
 548 /**
 549  * Ends an active OIAP session.
 550  *
 551  * @return return code of the operation
 552  */
 553 uint32_t tpm_end_oiap(void);
 554
 555 /**
 556  * Issue a TPM_LoadKey2 (Auth1) command using an OIAP session for authenticating
 557  * the usage of the parent key.
 558  *
 559  * @param parent_handle handle of the parent key.
 560  * @param key           pointer to the key structure (TPM_KEY or TPM_KEY12).
 561  * @param key_length    size of the key structure
 562  * @param parent_key_usage_auth usage auth for the parent key
 563  * @param key_handle    pointer to the key handle
 564  * @return return code of the operation
 565  */
 566 uint32_t tpm_load_key2_oiap(uint32_t parent_handle,
 567                 const void *key, size_t key_length,
 568                 const void *parent_key_usage_auth,
 569                 uint32_t *key_handle);
 570
 571 /**
 572  * Issue a TPM_GetPubKey (Auth1) command using an OIAP session for
 573  * authenticating the usage of the key.
 574  *
 575  * @param key_handle    handle of the key
 576  * @param usage_auth    usage auth for the key
 577  * @param pubkey        pointer to the pub key buffer; may be NULL if the pubkey
 578  *                      should not be stored.
 579  * @param pubkey_len    pointer to the pub key buffer len. On entry: the size of
 580  *                      the provided pubkey buffer. On successful exit: the size
 581  *                      of the stored TPM_PUBKEY structure (iff pubkey != NULL).
 582  * @return return code of the operation
 583  */
 584 uint32_t tpm_get_pub_key_oiap(uint32_t key_handle, const void *usage_auth,
 585                 void *pubkey, size_t *pubkey_len);
 586
 587 /**
 588  * Get the TPM permanent flags value
 589  *
 590  * @param pflags        Place to put permanent flags
 591  * @return return code of the operation
 592  */
 593 uint32_t tpm_get_permanent_flags(struct tpm_permanent_flags *pflags);
 594
 595 /**
 596  * Get the TPM permissions
 597  *
 598  * @param perm          Returns permissions value
 599  * @return return code of the operation
 600  */
 601 uint32_t tpm_get_permissions(uint32_t index, uint32_t *perm);
 602
 603 #endif /* __TPM_H */