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                   void *data, unsigned int *updates)
 258 {
 259         u8 idx_array_sz = max(idx_min_sz, DIV_ROUND_UP(idx, 8));
 260         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 261                 tpm_u16(TPM2_ST_NO_SESSIONS),   /* TAG */
 262                 tpm_u32(17 + idx_array_sz),     /* Length */
 263                 tpm_u32(TPM2_CC_PCR_READ),      /* Command code */
 264
 265                 /* TPML_PCR_SELECTION */
 266                 tpm_u32(1),                     /* Number of selections */
 267                 tpm_u16(TPM2_ALG_SHA256),       /* Algorithm of the hash */
 268                 idx_array_sz,                   /* Array size for selection */
 269                 /* bitmap(idx)                     Selected PCR bitmap */
 270         };
 271         size_t response_len = COMMAND_BUFFER_SIZE;
 272         u8 response[COMMAND_BUFFER_SIZE];
 273         unsigned int pcr_sel_idx = idx / 8;
 274         u8 pcr_sel_bit = BIT(idx % 8);
 275         unsigned int counter = 0;
 276         int ret;
 277
 278         if (pack_byte_string(command_v2, COMMAND_BUFFER_SIZE, "b",
 279                              17 + pcr_sel_idx, pcr_sel_bit))
 280                 return TPM_LIB_ERROR;
 281
 282         ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
 283         if (ret)
 284                 return ret;
 285
 286         if (unpack_byte_string(response, response_len, "ds",
 287                                10, &counter,
 288                                response_len - TPM2_DIGEST_LEN, data,
 289                                TPM2_DIGEST_LEN))
 290                 return TPM_LIB_ERROR;
 291
 292         if (updates)
 293                 *updates = counter;
 294
 295         return 0;
 296 }
 297
 298 u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
 299                         void *buf, size_t prop_count)
 300 {
 301         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 302                 tpm_u16(TPM2_ST_NO_SESSIONS),           /* TAG */
 303                 tpm_u32(22),                            /* Length */
 304                 tpm_u32(TPM2_CC_GET_CAPABILITY),        /* Command code */
 305
 306                 tpm_u32(capability),                    /* Capability */
 307                 tpm_u32(property),                      /* Property */
 308                 tpm_u32(prop_count),                    /* Property count */
 309         };
 310         u8 response[COMMAND_BUFFER_SIZE];
 311         size_t response_len = COMMAND_BUFFER_SIZE;
 312         unsigned int properties_off;
 313         int ret;
 314
 315         ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
 316         if (ret)
 317                 return ret;
 318
 319         /*
 320          * In the response buffer, the properties are located after the:
 321          * tag (u16), response size (u32), response code (u32),
 322          * YES/NO flag (u8), TPM_CAP (u32).
 323          */
 324         properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) +
 325                          sizeof(u8) + sizeof(u32);
 326         memcpy(buf, &response[properties_off], response_len - properties_off);
 327
 328         return 0;
 329 }
 330
 331 u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz)
 332 {
 333         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 334                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 335                 tpm_u32(27 + pw_sz),            /* Length */
 336                 tpm_u32(TPM2_CC_DAM_RESET),     /* Command code */
 337
 338                 /* HANDLE */
 339                 tpm_u32(TPM2_RH_LOCKOUT),       /* TPM resource handle */
 340
 341                 /* AUTH_SESSION */
 342                 tpm_u32(9 + pw_sz),             /* Authorization size */
 343                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 344                 tpm_u16(0),                     /* Size of <nonce> */
 345                                                 /* <nonce> (if any) */
 346                 0,                              /* Attributes: Cont/Excl/Rst */
 347                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 348                 /* STRING(pw)                      <hmac/password> (if any) */
 349         };
 350         unsigned int offset = 27;
 351         int ret;
 352
 353         /*
 354          * Fill the command structure starting from the first buffer:
 355          *     - the password (if any)
 356          */
 357         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
 358                                offset, pw, pw_sz);
 359         offset += pw_sz;
 360         if (ret)
 361                 return TPM_LIB_ERROR;
 362
 363         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 364 }
 365
 366 u32 tpm2_dam_parameters(struct udevice *dev, const char *pw,
 367                         const ssize_t pw_sz, unsigned int max_tries,
 368                         unsigned int recovery_time,
 369                         unsigned int lockout_recovery)
 370 {
 371         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 372                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 373                 tpm_u32(27 + pw_sz + 12),       /* Length */
 374                 tpm_u32(TPM2_CC_DAM_PARAMETERS), /* Command code */
 375
 376                 /* HANDLE */
 377                 tpm_u32(TPM2_RH_LOCKOUT),       /* TPM resource handle */
 378
 379                 /* AUTH_SESSION */
 380                 tpm_u32(9 + pw_sz),             /* Authorization size */
 381                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 382                 tpm_u16(0),                     /* Size of <nonce> */
 383                                                 /* <nonce> (if any) */
 384                 0,                              /* Attributes: Cont/Excl/Rst */
 385                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 386                 /* STRING(pw)                      <hmac/password> (if any) */
 387
 388                 /* LOCKOUT PARAMETERS */
 389                 /* tpm_u32(max_tries)              Max tries (0, always lock) */
 390                 /* tpm_u32(recovery_time)          Recovery time (0, no lock) */
 391                 /* tpm_u32(lockout_recovery)       Lockout recovery */
 392         };
 393         unsigned int offset = 27;
 394         int ret;
 395
 396         /*
 397          * Fill the command structure starting from the first buffer:
 398          *     - the password (if any)
 399          *     - max tries
 400          *     - recovery time
 401          *     - lockout recovery
 402          */
 403         ret = pack_byte_string(command_v2, sizeof(command_v2), "sddd",
 404                                offset, pw, pw_sz,
 405                                offset + pw_sz, max_tries,
 406                                offset + pw_sz + 4, recovery_time,
 407                                offset + pw_sz + 8, lockout_recovery);
 408         offset += pw_sz + 12;
 409         if (ret)
 410                 return TPM_LIB_ERROR;
 411
 412         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 413 }
 414
 415 int tpm2_change_auth(struct udevice *dev, u32 handle, const char *newpw,
 416                      const ssize_t newpw_sz, const char *oldpw,
 417                      const ssize_t oldpw_sz)
 418 {
 419         unsigned int offset = 27;
 420         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 421                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 422                 tpm_u32(offset + oldpw_sz + 2 + newpw_sz), /* Length */
 423                 tpm_u32(TPM2_CC_HIERCHANGEAUTH), /* Command code */
 424
 425                 /* HANDLE */
 426                 tpm_u32(handle),                /* TPM resource handle */
 427
 428                 /* AUTH_SESSION */
 429                 tpm_u32(9 + oldpw_sz),          /* Authorization size */
 430                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 431                 tpm_u16(0),                     /* Size of <nonce> */
 432                                                 /* <nonce> (if any) */
 433                 0,                              /* Attributes: Cont/Excl/Rst */
 434                 tpm_u16(oldpw_sz)               /* Size of <hmac/password> */
 435                 /* STRING(oldpw)                   <hmac/password> (if any) */
 436
 437                 /* TPM2B_AUTH (TPM2B_DIGEST) */
 438                 /* tpm_u16(newpw_sz)               Digest size, new pw length */
 439                 /* STRING(newpw)                   Digest buffer, new pw */
 440         };
 441         int ret;
 442
 443         /*
 444          * Fill the command structure starting from the first buffer:
 445          *     - the old password (if any)
 446          *     - size of the new password
 447          *     - new password
 448          */
 449         ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
 450                                offset, oldpw, oldpw_sz,
 451                                offset + oldpw_sz, newpw_sz,
 452                                offset + oldpw_sz + 2, newpw, newpw_sz);
 453         offset += oldpw_sz + 2 + newpw_sz;
 454         if (ret)
 455                 return TPM_LIB_ERROR;
 456
 457         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 458 }
 459
 460 u32 tpm2_pcr_setauthpolicy(struct udevice *dev, const char *pw,
 461                            const ssize_t pw_sz, u32 index, const char *key)
 462 {
 463         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 464                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 465                 tpm_u32(35 + pw_sz + TPM2_DIGEST_LEN), /* Length */
 466                 tpm_u32(TPM2_CC_PCR_SETAUTHPOL), /* Command code */
 467
 468                 /* HANDLE */
 469                 tpm_u32(TPM2_RH_PLATFORM),      /* TPM resource handle */
 470
 471                 /* AUTH_SESSION */
 472                 tpm_u32(9 + pw_sz),             /* Authorization size */
 473                 tpm_u32(TPM2_RS_PW),            /* session handle */
 474                 tpm_u16(0),                     /* Size of <nonce> */
 475                                                 /* <nonce> (if any) */
 476                 0,                              /* Attributes: Cont/Excl/Rst */
 477                 tpm_u16(pw_sz)                  /* Size of <hmac/password> */
 478                 /* STRING(pw)                      <hmac/password> (if any) */
 479
 480                 /* TPM2B_AUTH (TPM2B_DIGEST) */
 481                 /* tpm_u16(TPM2_DIGEST_LEN)        Digest size length */
 482                 /* STRING(key)                     Digest buffer (PCR key) */
 483
 484                 /* TPMI_ALG_HASH */
 485                 /* tpm_u16(TPM2_ALG_SHA256)   Algorithm of the hash */
 486
 487                 /* TPMI_DH_PCR */
 488                 /* tpm_u32(index),                 PCR Index */
 489         };
 490         unsigned int offset = 27;
 491         int ret;
 492
 493         /*
 494          * Fill the command structure starting from the first buffer:
 495          *     - the password (if any)
 496          *     - the PCR key length
 497          *     - the PCR key
 498          *     - the hash algorithm
 499          *     - the PCR index
 500          */
 501         ret = pack_byte_string(command_v2, sizeof(command_v2), "swswd",
 502                                offset, pw, pw_sz,
 503                                offset + pw_sz, TPM2_DIGEST_LEN,
 504                                offset + pw_sz + 2, key, TPM2_DIGEST_LEN,
 505                                offset + pw_sz + 2 + TPM2_DIGEST_LEN,
 506                                TPM2_ALG_SHA256,
 507                                offset + pw_sz + 4 + TPM2_DIGEST_LEN, index);
 508         offset += pw_sz + 2 + TPM2_DIGEST_LEN + 2 + 4;
 509         if (ret)
 510                 return TPM_LIB_ERROR;
 511
 512         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 513 }
 514
 515 u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw,
 516                           const ssize_t pw_sz, u32 index, const char *key,
 517                           const ssize_t key_sz)
 518 {
 519         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 520                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 521                 tpm_u32(33 + pw_sz + TPM2_DIGEST_LEN), /* Length */
 522                 tpm_u32(TPM2_CC_PCR_SETAUTHVAL), /* Command code */
 523
 524                 /* HANDLE */
 525                 tpm_u32(index),                 /* Handle (PCR Index) */
 526
 527                 /* AUTH_SESSION */
 528                 tpm_u32(9 + pw_sz),             /* Authorization size */
 529                 tpm_u32(TPM2_RS_PW),            /* session handle */
 530                 tpm_u16(0),                     /* Size of <nonce> */
 531                                                 /* <nonce> (if any) */
 532                 0,                              /* Attributes: Cont/Excl/Rst */
 533                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 534                 /* STRING(pw)                      <hmac/password> (if any) */
 535
 536                 /* TPM2B_DIGEST */
 537                 /* tpm_u16(key_sz)                 Key length */
 538                 /* STRING(key)                     Key */
 539         };
 540         unsigned int offset = 27;
 541         int ret;
 542
 543         /*
 544          * Fill the command structure starting from the first buffer:
 545          *     - the password (if any)
 546          *     - the number of digests, 1 in our case
 547          *     - the algorithm, sha256 in our case
 548          *     - the digest (64 bytes)
 549          */
 550         ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
 551                                offset, pw, pw_sz,
 552                                offset + pw_sz, key_sz,
 553                                offset + pw_sz + 2, key, key_sz);
 554         offset += pw_sz + 2 + key_sz;
 555         if (ret)
 556                 return TPM_LIB_ERROR;
 557
 558         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 559 }
 560
 561 u32 tpm2_get_random(struct udevice *dev, void *data, u32 count)
 562 {
 563         const u8 command_v2[10] = {
 564                 tpm_u16(TPM2_ST_NO_SESSIONS),
 565                 tpm_u32(12),
 566                 tpm_u32(TPM2_CC_GET_RANDOM),
 567         };
 568         u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
 569
 570         const size_t data_size_offset = 10;
 571         const size_t data_offset = 12;
 572         size_t response_length = sizeof(response);
 573         u32 data_size;
 574         u8 *out = data;
 575
 576         while (count > 0) {
 577                 u32 this_bytes = min((size_t)count,
 578                                      sizeof(response) - data_offset);
 579                 u32 err;
 580
 581                 if (pack_byte_string(buf, sizeof(buf), "sw",
 582                                      0, command_v2, sizeof(command_v2),
 583                                      sizeof(command_v2), this_bytes))
 584                         return TPM_LIB_ERROR;
 585                 err = tpm_sendrecv_command(dev, buf, response,
 586                                            &response_length);
 587                 if (err)
 588                         return err;
 589                 if (unpack_byte_string(response, response_length, "w",
 590                                        data_size_offset, &data_size))
 591                         return TPM_LIB_ERROR;
 592                 if (data_size > this_bytes)
 593                         return TPM_LIB_ERROR;
 594                 if (unpack_byte_string(response, response_length, "s",
 595                                        data_offset, out, data_size))
 596                         return TPM_LIB_ERROR;
 597
 598                 count -= data_size;
 599                 out += data_size;
 600         }
 601
 602         return 0;
 603 }
 604
 605 u32 tpm2_write_lock(struct udevice *dev, u32 index)
 606 {
 607         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 608                 /* header 10 bytes */
 609                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 610                 tpm_u32(10 + 8 + 13), /* Length */
 611                 tpm_u32(TPM2_CC_NV_WRITELOCK), /* Command code */
 612
 613                 /* handles 8 bytes */
 614                 tpm_u32(TPM2_RH_PLATFORM),      /* Primary platform seed */
 615                 tpm_u32(HR_NV_INDEX + index),   /* Password authorisation */
 616
 617                 /* session header 9 bytes */
 618                 tpm_u32(9),                     /* Header size */
 619                 tpm_u32(TPM2_RS_PW),            /* Password authorisation */
 620                 tpm_u16(0),                     /* nonce_size */
 621                 0,                              /* session_attrs */
 622                 tpm_u16(0),                     /* auth_size */
 623         };
 624
 625         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 626 }
 627
 628 u32 tpm2_disable_platform_hierarchy(struct udevice *dev)
 629 {
 630         struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
 631         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 632                 /* header 10 bytes */
 633                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 634                 tpm_u32(10 + 4 + 13 + 5),       /* Length */
 635                 tpm_u32(TPM2_CC_HIER_CONTROL),  /* Command code */
 636
 637                 /* 4 bytes */
 638                 tpm_u32(TPM2_RH_PLATFORM),      /* Primary platform seed */
 639
 640                 /* session header 9 bytes */
 641                 tpm_u32(9),                     /* Header size */
 642                 tpm_u32(TPM2_RS_PW),            /* Password authorisation */
 643                 tpm_u16(0),                     /* nonce_size */
 644                 0,                              /* session_attrs */
 645                 tpm_u16(0),                     /* auth_size */
 646
 647                 /* payload 5 bytes */
 648                 tpm_u32(TPM2_RH_PLATFORM),      /* Hierarchy to disable */
 649                 0,                              /* 0=disable */
 650         };
 651         int ret;
 652
 653         ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 654         log_info("ret=%s, %x\n", dev->name, ret);
 655         if (ret)
 656                 return ret;
 657
 658         priv->plat_hier_disabled = true;
 659
 660         return 0;
 661 }
 662
 663 u32 tpm2_submit_command(struct udevice *dev, const u8 *sendbuf,
 664                         u8 *recvbuf, size_t *recv_size)
 665 {
 666         return tpm_sendrecv_command(dev, sendbuf, recvbuf, recv_size);
 667 }