lib/tpm-v2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2018 Bootlin
   4  * Author: Miquel Raynal <miquel.raynal@bootlin.com>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <tpm-common.h>
  10 #include <tpm-v2.h>
  11 #include <linux/bitops.h>
  12 #include "tpm-utils.h"
  13
  14 u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode)
  15 {
  16         const u8 command_v2[12] = {
  17                 tpm_u16(TPM2_ST_NO_SESSIONS),
  18                 tpm_u32(12),
  19                 tpm_u32(TPM2_CC_STARTUP),
  20                 tpm_u16(mode),
  21         };
  22         int ret;
  23
  24         /*
  25          * Note TPM2_Startup command will return RC_SUCCESS the first time,
  26          * but will return RC_INITIALIZE otherwise.
  27          */
  28         ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
  29         if (ret && ret != TPM2_RC_INITIALIZE)
  30                 return ret;
  31
  32         return 0;
  33 }
  34
  35 u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test)
  36 {
  37         const u8 command_v2[12] = {
  38                 tpm_u16(TPM2_ST_NO_SESSIONS),
  39                 tpm_u32(11),
  40                 tpm_u32(TPM2_CC_SELF_TEST),
  41                 full_test,
  42         };
  43
  44         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
  45 }
  46
  47 u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw,
  48                const ssize_t pw_sz)
  49 {
  50         /* Length of the message header, up to start of password */
  51         uint offset = 27;
  52         u8 command_v2[COMMAND_BUFFER_SIZE] = {
  53                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
  54                 tpm_u32(offset + pw_sz),        /* Length */
  55                 tpm_u32(TPM2_CC_CLEAR),         /* Command code */
  56
  57                 /* HANDLE */
  58                 tpm_u32(handle),                /* TPM resource handle */
  59
  60                 /* AUTH_SESSION */
  61                 tpm_u32(9 + pw_sz),             /* Authorization size */
  62                 tpm_u32(TPM2_RS_PW),            /* Session handle */
  63                 tpm_u16(0),                     /* Size of <nonce> */
  64                                                 /* <nonce> (if any) */
  65                 0,                              /* Attributes: Cont/Excl/Rst */
  66                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
  67                 /* STRING(pw)                      <hmac/password> (if any) */
  68         };
  69         int ret;
  70
  71         /*
  72          * Fill the command structure starting from the first buffer:
  73          *     - the password (if any)
  74          */
  75         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
  76                                offset, pw, pw_sz);
  77         offset += pw_sz;
  78         if (ret)
  79                 return TPM_LIB_ERROR;
  80
  81         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
  82 }
  83
  84 u32 tpm2_nv_define_space(struct udevice *dev, u32 space_index,
  85                          size_t space_size, u32 nv_attributes,
  86                          const u8 *nv_policy, size_t nv_policy_size)
  87 {
  88         /*
  89          * Calculate the offset of the nv_policy piece by adding each of the
  90          * chunks below.
  91          */
  92         uint offset = 10 + 8 + 13 + 14;
  93         u8 command_v2[COMMAND_BUFFER_SIZE] = {
  94                 /* header 10 bytes */
  95                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
  96                 tpm_u32(offset + nv_policy_size),/* Length */
  97                 tpm_u32(TPM2_CC_NV_DEFINE_SPACE),/* Command code */
  98
  99                 /* handles 8 bytes */
 100                 tpm_u32(TPM2_RH_PLATFORM),      /* Primary platform seed */
 101
 102                 /* session header 13 bytes */
 103                 tpm_u32(9),                     /* Header size */
 104                 tpm_u32(TPM2_RS_PW),            /* Password authorisation */
 105                 tpm_u16(0),                     /* nonce_size */
 106                 0,                              /* session_attrs */
 107                 tpm_u16(0),                     /* auth_size */
 108
 109                 /* message 14 bytes + policy */
 110                 tpm_u16(12 + nv_policy_size),   /* size */
 111                 tpm_u32(space_index),
 112                 tpm_u16(TPM2_ALG_SHA256),
 113                 tpm_u32(nv_attributes),
 114                 tpm_u16(nv_policy_size),
 115                 /* nv_policy */
 116         };
 117         int ret;
 118
 119         /*
 120          * Fill the command structure starting from the first buffer:
 121          *     - the password (if any)
 122          */
 123         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
 124                                offset, nv_policy, nv_policy_size);
 125         if (ret)
 126                 return TPM_LIB_ERROR;
 127
 128         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 129 }
 130
 131 u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm,
 132                     const u8 *digest, u32 digest_len)
 133 {
 134         /* Length of the message header, up to start of digest */
 135         uint offset = 33;
 136         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 137                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 138                 tpm_u32(offset + digest_len),   /* Length */
 139                 tpm_u32(TPM2_CC_PCR_EXTEND),    /* Command code */
 140
 141                 /* HANDLE */
 142                 tpm_u32(index),                 /* Handle (PCR Index) */
 143
 144                 /* AUTH_SESSION */
 145                 tpm_u32(9),                     /* Authorization size */
 146                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 147                 tpm_u16(0),                     /* Size of <nonce> */
 148                                                 /* <nonce> (if any) */
 149                 0,                              /* Attributes: Cont/Excl/Rst */
 150                 tpm_u16(0),                     /* Size of <hmac/password> */
 151                                                 /* <hmac/password> (if any) */
 152
 153                 /* hashes */
 154                 tpm_u32(1),                     /* Count (number of hashes) */
 155                 tpm_u16(algorithm),     /* Algorithm of the hash */
 156                 /* STRING(digest)                  Digest */
 157         };
 158         int ret;
 159
 160         /*
 161          * Fill the command structure starting from the first buffer:
 162          *     - the digest
 163          */
 164         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
 165                                offset, digest, digest_len);
 166         if (ret)
 167                 return TPM_LIB_ERROR;
 168
 169         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 170 }
 171
 172 u32 tpm2_nv_read_value(struct udevice *dev, u32 index, void *data, u32 count)
 173 {
 174         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 175                 /* header 10 bytes */
 176                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 177                 tpm_u32(10 + 8 + 4 + 9 + 4),    /* Length */
 178                 tpm_u32(TPM2_CC_NV_READ),       /* Command code */
 179
 180                 /* handles 8 bytes */
 181                 tpm_u32(TPM2_RH_PLATFORM),      /* Primary platform seed */
 182                 tpm_u32(HR_NV_INDEX + index),   /* Password authorisation */
 183
 184                 /* AUTH_SESSION */
 185                 tpm_u32(9),                     /* Authorization size */
 186                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 187                 tpm_u16(0),                     /* Size of <nonce> */
 188                                                 /* <nonce> (if any) */
 189                 0,                              /* Attributes: Cont/Excl/Rst */
 190                 tpm_u16(0),                     /* Size of <hmac/password> */
 191                                                 /* <hmac/password> (if any) */
 192
 193                 tpm_u16(count),                 /* Number of bytes */
 194                 tpm_u16(0),                     /* Offset */
 195         };
 196         size_t response_len = COMMAND_BUFFER_SIZE;
 197         u8 response[COMMAND_BUFFER_SIZE];
 198         int ret;
 199         u16 tag;
 200         u32 size, code;
 201
 202         ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
 203         if (ret)
 204                 return log_msg_ret("read", ret);
 205         if (unpack_byte_string(response, response_len, "wdds",
 206                                0, &tag, 2, &size, 6, &code,
 207                                16, data, count))
 208                 return TPM_LIB_ERROR;
 209
 210         return 0;
 211 }
 212
 213 u32 tpm2_nv_write_value(struct udevice *dev, u32 index, const void *data,
 214                         u32 count)
 215 {
 216         struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
 217         uint offset = 10 + 8 + 4 + 9 + 2;
 218         uint len = offset + count + 2;
 219         /* Use empty password auth if platform hierarchy is disabled */
 220         u32 auth = priv->plat_hier_disabled ? HR_NV_INDEX + index :
 221                 TPM2_RH_PLATFORM;
 222         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 223                 /* header 10 bytes */
 224                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 225                 tpm_u32(len),                   /* Length */
 226                 tpm_u32(TPM2_CC_NV_WRITE),      /* Command code */
 227
 228                 /* handles 8 bytes */
 229                 tpm_u32(auth),                  /* Primary platform seed */
 230                 tpm_u32(HR_NV_INDEX + index),   /* Password authorisation */
 231
 232                 /* AUTH_SESSION */
 233                 tpm_u32(9),                     /* Authorization size */
 234                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 235                 tpm_u16(0),                     /* Size of <nonce> */
 236                                                 /* <nonce> (if any) */
 237                 0,                              /* Attributes: Cont/Excl/Rst */
 238                 tpm_u16(0),                     /* Size of <hmac/password> */
 239                                                 /* <hmac/password> (if any) */
 240
 241                 tpm_u16(count),
 242         };
 243         size_t response_len = COMMAND_BUFFER_SIZE;
 244         u8 response[COMMAND_BUFFER_SIZE];
 245         int ret;
 246
 247         ret = pack_byte_string(command_v2, sizeof(command_v2), "sw",
 248                                offset, data, count,
 249                                offset + count, 0);
 250         if (ret)
 251                 return TPM_LIB_ERROR;
 252
 253         return tpm_sendrecv_command(dev, command_v2, response, &response_len);
 254 }
 255
 256 u32 tpm2_pcr_read(struct udevice *dev, u32 idx, unsigned int idx_min_sz,
 257                   u16 algorithm, void *data, u32 digest_len,
 258                   unsigned int *updates)
 259 {
 260         u8 idx_array_sz = max(idx_min_sz, DIV_ROUND_UP(idx, 8));
 261         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 262                 tpm_u16(TPM2_ST_NO_SESSIONS),   /* TAG */
 263                 tpm_u32(17 + idx_array_sz),     /* Length */
 264                 tpm_u32(TPM2_CC_PCR_READ),      /* Command code */
 265
 266                 /* TPML_PCR_SELECTION */
 267                 tpm_u32(1),                     /* Number of selections */
 268                 tpm_u16(algorithm),             /* Algorithm of the hash */
 269                 idx_array_sz,                   /* Array size for selection */
 270                 /* bitmap(idx)                     Selected PCR bitmap */
 271         };
 272         size_t response_len = COMMAND_BUFFER_SIZE;
 273         u8 response[COMMAND_BUFFER_SIZE];
 274         unsigned int pcr_sel_idx = idx / 8;
 275         u8 pcr_sel_bit = BIT(idx % 8);
 276         unsigned int counter = 0;
 277         int ret;
 278
 279         if (pack_byte_string(command_v2, COMMAND_BUFFER_SIZE, "b",
 280                              17 + pcr_sel_idx, pcr_sel_bit))
 281                 return TPM_LIB_ERROR;
 282
 283         ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
 284         if (ret)
 285                 return ret;
 286
 287         if (digest_len > response_len)
 288                 return TPM_LIB_ERROR;
 289
 290         if (unpack_byte_string(response, response_len, "ds",
 291                                10, &counter,
 292                                response_len - digest_len, data,
 293                                digest_len))
 294                 return TPM_LIB_ERROR;
 295
 296         if (updates)
 297                 *updates = counter;
 298
 299         return 0;
 300 }
 301
 302 u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
 303                         void *buf, size_t prop_count)
 304 {
 305         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 306                 tpm_u16(TPM2_ST_NO_SESSIONS),           /* TAG */
 307                 tpm_u32(22),                            /* Length */
 308                 tpm_u32(TPM2_CC_GET_CAPABILITY),        /* Command code */
 309
 310                 tpm_u32(capability),                    /* Capability */
 311                 tpm_u32(property),                      /* Property */
 312                 tpm_u32(prop_count),                    /* Property count */
 313         };
 314         u8 response[COMMAND_BUFFER_SIZE];
 315         size_t response_len = COMMAND_BUFFER_SIZE;
 316         unsigned int properties_off;
 317         int ret;
 318
 319         ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
 320         if (ret)
 321                 return ret;
 322
 323         /*
 324          * In the response buffer, the properties are located after the:
 325          * tag (u16), response size (u32), response code (u32),
 326          * YES/NO flag (u8), TPM_CAP (u32).
 327          */
 328         properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) +
 329                          sizeof(u8) + sizeof(u32);
 330         memcpy(buf, &response[properties_off], response_len - properties_off);
 331
 332         return 0;
 333 }
 334
 335 u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz)
 336 {
 337         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 338                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 339                 tpm_u32(27 + pw_sz),            /* Length */
 340                 tpm_u32(TPM2_CC_DAM_RESET),     /* Command code */
 341
 342                 /* HANDLE */
 343                 tpm_u32(TPM2_RH_LOCKOUT),       /* TPM resource handle */
 344
 345                 /* AUTH_SESSION */
 346                 tpm_u32(9 + pw_sz),             /* Authorization size */
 347                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 348                 tpm_u16(0),                     /* Size of <nonce> */
 349                                                 /* <nonce> (if any) */
 350                 0,                              /* Attributes: Cont/Excl/Rst */
 351                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 352                 /* STRING(pw)                      <hmac/password> (if any) */
 353         };
 354         unsigned int offset = 27;
 355         int ret;
 356
 357         /*
 358          * Fill the command structure starting from the first buffer:
 359          *     - the password (if any)
 360          */
 361         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
 362                                offset, pw, pw_sz);
 363         offset += pw_sz;
 364         if (ret)
 365                 return TPM_LIB_ERROR;
 366
 367         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 368 }
 369
 370 u32 tpm2_dam_parameters(struct udevice *dev, const char *pw,
 371                         const ssize_t pw_sz, unsigned int max_tries,
 372                         unsigned int recovery_time,
 373                         unsigned int lockout_recovery)
 374 {
 375         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 376                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 377                 tpm_u32(27 + pw_sz + 12),       /* Length */
 378                 tpm_u32(TPM2_CC_DAM_PARAMETERS), /* Command code */
 379
 380                 /* HANDLE */
 381                 tpm_u32(TPM2_RH_LOCKOUT),       /* TPM resource handle */
 382
 383                 /* AUTH_SESSION */
 384                 tpm_u32(9 + pw_sz),             /* Authorization size */
 385                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 386                 tpm_u16(0),                     /* Size of <nonce> */
 387                                                 /* <nonce> (if any) */
 388                 0,                              /* Attributes: Cont/Excl/Rst */
 389                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 390                 /* STRING(pw)                      <hmac/password> (if any) */
 391
 392                 /* LOCKOUT PARAMETERS */
 393                 /* tpm_u32(max_tries)              Max tries (0, always lock) */
 394                 /* tpm_u32(recovery_time)          Recovery time (0, no lock) */
 395                 /* tpm_u32(lockout_recovery)       Lockout recovery */
 396         };
 397         unsigned int offset = 27;
 398         int ret;
 399
 400         /*
 401          * Fill the command structure starting from the first buffer:
 402          *     - the password (if any)
 403          *     - max tries
 404          *     - recovery time
 405          *     - lockout recovery
 406          */
 407         ret = pack_byte_string(command_v2, sizeof(command_v2), "sddd",
 408                                offset, pw, pw_sz,
 409                                offset + pw_sz, max_tries,
 410                                offset + pw_sz + 4, recovery_time,
 411                                offset + pw_sz + 8, lockout_recovery);
 412         offset += pw_sz + 12;
 413         if (ret)
 414                 return TPM_LIB_ERROR;
 415
 416         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 417 }
 418
 419 int tpm2_change_auth(struct udevice *dev, u32 handle, const char *newpw,
 420                      const ssize_t newpw_sz, const char *oldpw,
 421                      const ssize_t oldpw_sz)
 422 {
 423         unsigned int offset = 27;
 424         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 425                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 426                 tpm_u32(offset + oldpw_sz + 2 + newpw_sz), /* Length */
 427                 tpm_u32(TPM2_CC_HIERCHANGEAUTH), /* Command code */
 428
 429                 /* HANDLE */
 430                 tpm_u32(handle),                /* TPM resource handle */
 431
 432                 /* AUTH_SESSION */
 433                 tpm_u32(9 + oldpw_sz),          /* Authorization size */
 434                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 435                 tpm_u16(0),                     /* Size of <nonce> */
 436                                                 /* <nonce> (if any) */
 437                 0,                              /* Attributes: Cont/Excl/Rst */
 438                 tpm_u16(oldpw_sz)               /* Size of <hmac/password> */
 439                 /* STRING(oldpw)                   <hmac/password> (if any) */
 440
 441                 /* TPM2B_AUTH (TPM2B_DIGEST) */
 442                 /* tpm_u16(newpw_sz)               Digest size, new pw length */
 443                 /* STRING(newpw)                   Digest buffer, new pw */
 444         };
 445         int ret;
 446
 447         /*
 448          * Fill the command structure starting from the first buffer:
 449          *     - the old password (if any)
 450          *     - size of the new password
 451          *     - new password
 452          */
 453         ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
 454                                offset, oldpw, oldpw_sz,
 455                                offset + oldpw_sz, newpw_sz,
 456                                offset + oldpw_sz + 2, newpw, newpw_sz);
 457         offset += oldpw_sz + 2 + newpw_sz;
 458         if (ret)
 459                 return TPM_LIB_ERROR;
 460
 461         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 462 }
 463
 464 u32 tpm2_pcr_setauthpolicy(struct udevice *dev, const char *pw,
 465                            const ssize_t pw_sz, u32 index, const char *key)
 466 {
 467         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 468                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 469                 tpm_u32(35 + pw_sz + TPM2_DIGEST_LEN), /* Length */
 470                 tpm_u32(TPM2_CC_PCR_SETAUTHPOL), /* Command code */
 471
 472                 /* HANDLE */
 473                 tpm_u32(TPM2_RH_PLATFORM),      /* TPM resource handle */
 474
 475                 /* AUTH_SESSION */
 476                 tpm_u32(9 + pw_sz),             /* Authorization size */
 477                 tpm_u32(TPM2_RS_PW),            /* session handle */
 478                 tpm_u16(0),                     /* Size of <nonce> */
 479                                                 /* <nonce> (if any) */
 480                 0,                              /* Attributes: Cont/Excl/Rst */
 481                 tpm_u16(pw_sz)                  /* Size of <hmac/password> */
 482                 /* STRING(pw)                      <hmac/password> (if any) */
 483
 484                 /* TPM2B_AUTH (TPM2B_DIGEST) */
 485                 /* tpm_u16(TPM2_DIGEST_LEN)        Digest size length */
 486                 /* STRING(key)                     Digest buffer (PCR key) */
 487
 488                 /* TPMI_ALG_HASH */
 489                 /* tpm_u16(TPM2_ALG_SHA256)   Algorithm of the hash */
 490
 491                 /* TPMI_DH_PCR */
 492                 /* tpm_u32(index),                 PCR Index */
 493         };
 494         unsigned int offset = 27;
 495         int ret;
 496
 497         /*
 498          * Fill the command structure starting from the first buffer:
 499          *     - the password (if any)
 500          *     - the PCR key length
 501          *     - the PCR key
 502          *     - the hash algorithm
 503          *     - the PCR index
 504          */
 505         ret = pack_byte_string(command_v2, sizeof(command_v2), "swswd",
 506                                offset, pw, pw_sz,
 507                                offset + pw_sz, TPM2_DIGEST_LEN,
 508                                offset + pw_sz + 2, key, TPM2_DIGEST_LEN,
 509                                offset + pw_sz + 2 + TPM2_DIGEST_LEN,
 510                                TPM2_ALG_SHA256,
 511                                offset + pw_sz + 4 + TPM2_DIGEST_LEN, index);
 512         offset += pw_sz + 2 + TPM2_DIGEST_LEN + 2 + 4;
 513         if (ret)
 514                 return TPM_LIB_ERROR;
 515
 516         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 517 }
 518
 519 u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw,
 520                           const ssize_t pw_sz, u32 index, const char *key,
 521                           const ssize_t key_sz)
 522 {
 523         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 524                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 525                 tpm_u32(33 + pw_sz + TPM2_DIGEST_LEN), /* Length */
 526                 tpm_u32(TPM2_CC_PCR_SETAUTHVAL), /* Command code */
 527
 528                 /* HANDLE */
 529                 tpm_u32(index),                 /* Handle (PCR Index) */
 530
 531                 /* AUTH_SESSION */
 532                 tpm_u32(9 + pw_sz),             /* Authorization size */
 533                 tpm_u32(TPM2_RS_PW),            /* session handle */
 534                 tpm_u16(0),                     /* Size of <nonce> */
 535                                                 /* <nonce> (if any) */
 536                 0,                              /* Attributes: Cont/Excl/Rst */
 537                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 538                 /* STRING(pw)                      <hmac/password> (if any) */
 539
 540                 /* TPM2B_DIGEST */
 541                 /* tpm_u16(key_sz)                 Key length */
 542                 /* STRING(key)                     Key */
 543         };
 544         unsigned int offset = 27;
 545         int ret;
 546
 547         /*
 548          * Fill the command structure starting from the first buffer:
 549          *     - the password (if any)
 550          *     - the number of digests, 1 in our case
 551          *     - the algorithm, sha256 in our case
 552          *     - the digest (64 bytes)
 553          */
 554         ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
 555                                offset, pw, pw_sz,
 556                                offset + pw_sz, key_sz,
 557                                offset + pw_sz + 2, key, key_sz);
 558         offset += pw_sz + 2 + key_sz;
 559         if (ret)
 560                 return TPM_LIB_ERROR;
 561
 562         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 563 }
 564
 565 u32 tpm2_get_random(struct udevice *dev, void *data, u32 count)
 566 {
 567         const u8 command_v2[10] = {
 568                 tpm_u16(TPM2_ST_NO_SESSIONS),
 569                 tpm_u32(12),
 570                 tpm_u32(TPM2_CC_GET_RANDOM),
 571         };
 572         u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
 573
 574         const size_t data_size_offset = 10;
 575         const size_t data_offset = 12;
 576         size_t response_length = sizeof(response);
 577         u32 data_size;
 578         u8 *out = data;
 579
 580         while (count > 0) {
 581                 u32 this_bytes = min((size_t)count,
 582                                      sizeof(response) - data_offset);
 583                 u32 err;
 584
 585                 if (pack_byte_string(buf, sizeof(buf), "sw",
 586                                      0, command_v2, sizeof(command_v2),
 587                                      sizeof(command_v2), this_bytes))
 588                         return TPM_LIB_ERROR;
 589                 err = tpm_sendrecv_command(dev, buf, response,
 590                                            &response_length);
 591                 if (err)
 592                         return err;
 593                 if (unpack_byte_string(response, response_length, "w",
 594                                        data_size_offset, &data_size))
 595                         return TPM_LIB_ERROR;
 596                 if (data_size > this_bytes)
 597                         return TPM_LIB_ERROR;
 598                 if (unpack_byte_string(response, response_length, "s",
 599                                        data_offset, out, data_size))
 600                         return TPM_LIB_ERROR;
 601
 602                 count -= data_size;
 603                 out += data_size;
 604         }
 605
 606         return 0;
 607 }
 608
 609 u32 tpm2_write_lock(struct udevice *dev, u32 index)
 610 {
 611         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 612                 /* header 10 bytes */
 613                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 614                 tpm_u32(10 + 8 + 13), /* Length */
 615                 tpm_u32(TPM2_CC_NV_WRITELOCK), /* Command code */
 616
 617                 /* handles 8 bytes */
 618                 tpm_u32(TPM2_RH_PLATFORM),      /* Primary platform seed */
 619                 tpm_u32(HR_NV_INDEX + index),   /* Password authorisation */
 620
 621                 /* session header 9 bytes */
 622                 tpm_u32(9),                     /* Header size */
 623                 tpm_u32(TPM2_RS_PW),            /* Password authorisation */
 624                 tpm_u16(0),                     /* nonce_size */
 625                 0,                              /* session_attrs */
 626                 tpm_u16(0),                     /* auth_size */
 627         };
 628
 629         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 630 }
 631
 632 u32 tpm2_disable_platform_hierarchy(struct udevice *dev)
 633 {
 634         struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
 635         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 636                 /* header 10 bytes */
 637                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 638                 tpm_u32(10 + 4 + 13 + 5),       /* Length */
 639                 tpm_u32(TPM2_CC_HIER_CONTROL),  /* Command code */
 640
 641                 /* 4 bytes */
 642                 tpm_u32(TPM2_RH_PLATFORM),      /* Primary platform seed */
 643
 644                 /* session header 9 bytes */
 645                 tpm_u32(9),                     /* Header size */
 646                 tpm_u32(TPM2_RS_PW),            /* Password authorisation */
 647                 tpm_u16(0),                     /* nonce_size */
 648                 0,                              /* session_attrs */
 649                 tpm_u16(0),                     /* auth_size */
 650
 651                 /* payload 5 bytes */
 652                 tpm_u32(TPM2_RH_PLATFORM),      /* Hierarchy to disable */
 653                 0,                              /* 0=disable */
 654         };
 655         int ret;
 656
 657         ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 658         log_info("ret=%s, %x\n", dev->name, ret);
 659         if (ret)
 660                 return ret;
 661
 662         priv->plat_hier_disabled = true;
 663
 664         return 0;
 665 }
 666
 667 u32 tpm2_submit_command(struct udevice *dev, const u8 *sendbuf,
 668                         u8 *recvbuf, size_t *recv_size)
 669 {
 670         return tpm_sendrecv_command(dev, sendbuf, recvbuf, recv_size);
 671 }