lib/tcrypt/tcrypt.c

   1 /*
   2  * TCRYPT (TrueCrypt-compatible) and VeraCrypt volume handling
   3  *
   4  * Copyright (C) 2012-2023 Red Hat, Inc. All rights reserved.
   5  * Copyright (C) 2012-2023 Milan Broz
   6  *
   7  * This file is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This file is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this file; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  */
  21
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "libcryptsetup.h"
  28 #include "tcrypt.h"
  29 #include "internal.h"
  30
  31 /* TCRYPT PBKDF variants */
  32 static const struct {
  33         unsigned int legacy:1;
  34         unsigned int veracrypt:1;
  35         const char *name;
  36         const char *hash;
  37         unsigned int iterations;
  38         uint32_t veracrypt_pim_const;
  39         uint32_t veracrypt_pim_mult;
  40 } tcrypt_kdf[] = {
  41         { 0, 0, "pbkdf2", "ripemd160",   2000, 0, 0 },
  42         { 0, 0, "pbkdf2", "ripemd160",   1000, 0, 0 },
  43         { 0, 0, "pbkdf2", "sha512",      1000, 0, 0 },
  44         { 0, 0, "pbkdf2", "whirlpool",   1000, 0, 0 },
  45         { 1, 0, "pbkdf2", "sha1",        2000, 0, 0 },
  46         { 0, 1, "pbkdf2", "sha512",    500000, 15000, 1000 },
  47         { 0, 1, "pbkdf2", "whirlpool", 500000, 15000, 1000 },
  48         { 0, 1, "pbkdf2", "sha256",    500000, 15000, 1000 }, // VeraCrypt 1.0f
  49         { 0, 1, "pbkdf2", "sha256",    200000,     0, 2048 }, // boot only
  50         { 0, 1, "pbkdf2", "ripemd160", 655331, 15000, 1000 },
  51         { 0, 1, "pbkdf2", "ripemd160", 327661,     0, 2048 }, // boot only
  52         { 0, 1, "pbkdf2", "stribog512",500000, 15000, 1000 },
  53 //      { 0, 1, "pbkdf2", "stribog512",200000,     0, 2048 }, // boot only
  54         { 0, 0,     NULL,        NULL,      0,     0,    0 }
  55 };
  56
  57 struct tcrypt_alg {
  58                 const char *name;
  59                 unsigned int key_size;
  60                 unsigned int iv_size;
  61                 unsigned int key_offset;
  62                 unsigned int iv_offset; /* or tweak key offset */
  63                 unsigned int key_extra_size;
  64 };
  65
  66 struct tcrypt_algs {
  67         unsigned int legacy:1;
  68         unsigned int chain_count;
  69         unsigned int chain_key_size;
  70         const char *long_name;
  71         const char *mode;
  72         struct tcrypt_alg cipher[3];
  73 };
  74
  75 /* TCRYPT cipher variants */
  76 static struct tcrypt_algs tcrypt_cipher[] = {
  77 /* XTS mode */
  78 {0,1,64,"aes","xts-plain64",
  79         {{"aes",    64,16,0,32,0}}},
  80 {0,1,64,"serpent","xts-plain64",
  81         {{"serpent",64,16,0,32,0}}},
  82 {0,1,64,"twofish","xts-plain64",
  83         {{"twofish",64,16,0,32,0}}},
  84 {0,2,128,"twofish-aes","xts-plain64",
  85         {{"twofish",64,16, 0,64,0},
  86          {"aes",    64,16,32,96,0}}},
  87 {0,3,192,"serpent-twofish-aes","xts-plain64",
  88         {{"serpent",64,16, 0, 96,0},
  89          {"twofish",64,16,32,128,0},
  90          {"aes",    64,16,64,160,0}}},
  91 {0,2,128,"aes-serpent","xts-plain64",
  92         {{"aes",    64,16, 0,64,0},
  93          {"serpent",64,16,32,96,0}}},
  94 {0,3,192,"aes-twofish-serpent","xts-plain64",
  95         {{"aes",    64,16, 0, 96,0},
  96          {"twofish",64,16,32,128,0},
  97          {"serpent",64,16,64,160,0}}},
  98 {0,2,128,"serpent-twofish","xts-plain64",
  99         {{"serpent",64,16, 0,64,0},
 100          {"twofish",64,16,32,96,0}}},
 101 {0,1,64,"camellia","xts-plain64",
 102         {{"camellia",    64,16,0,32,0}}},
 103 {0,1,64,"kuznyechik","xts-plain64",
 104         {{"kuznyechik",  64,16,0,32,0}}},
 105 {0,2,128,"kuznyechik-camellia","xts-plain64",
 106         {{"kuznyechik",64,16, 0,64,0},
 107          {"camellia",  64,16,32,96,0}}},
 108 {0,2,128,"twofish-kuznyechik","xts-plain64",
 109         {{"twofish",   64,16, 0,64,0},
 110          {"kuznyechik",64,16,32,96,0}}},
 111 {0,2,128,"serpent-camellia","xts-plain64",
 112         {{"serpent",   64,16, 0,64,0},
 113          {"camellia",  64,16,32,96,0}}},
 114 {0,2,128,"aes-kuznyechik","xts-plain64",
 115         {{"aes",       64,16, 0,64,0},
 116          {"kuznyechik",64,16,32,96,0}}},
 117 {0,3,192,"camellia-serpent-kuznyechik","xts-plain64",
 118         {{"camellia",  64,16, 0, 96,0},
 119          {"serpent",   64,16,32,128,0},
 120          {"kuznyechik",64,16,64,160,0}}},
 121
 122 /* LRW mode */
 123 {0,1,48,"aes","lrw-benbi",
 124         {{"aes",    48,16,32,0,0}}},
 125 {0,1,48,"serpent","lrw-benbi",
 126         {{"serpent",48,16,32,0,0}}},
 127 {0,1,48,"twofish","lrw-benbi",
 128         {{"twofish",48,16,32,0,0}}},
 129 {0,2,96,"twofish-aes","lrw-benbi",
 130         {{"twofish",48,16,32,0,0},
 131          {"aes",    48,16,64,0,0}}},
 132 {0,3,144,"serpent-twofish-aes","lrw-benbi",
 133         {{"serpent",48,16,32,0,0},
 134          {"twofish",48,16,64,0,0},
 135          {"aes",    48,16,96,0,0}}},
 136 {0,2,96,"aes-serpent","lrw-benbi",
 137         {{"aes",    48,16,32,0,0},
 138          {"serpent",48,16,64,0,0}}},
 139 {0,3,144,"aes-twofish-serpent","lrw-benbi",
 140         {{"aes",    48,16,32,0,0},
 141          {"twofish",48,16,64,0,0},
 142          {"serpent",48,16,96,0,0}}},
 143 {0,2,96,"serpent-twofish", "lrw-benbi",
 144         {{"serpent",48,16,32,0,0},
 145          {"twofish",48,16,64,0,0}}},
 146
 147 /* Kernel LRW block size is fixed to 16 bytes for GF(2^128)
 148  * thus cannot be used with blowfish where block is 8 bytes.
 149  * There also no GF(2^64) support.
 150 {1,1,64,"blowfish_le","lrw-benbi",
 151          {{"blowfish_le",64,8,32,0,0}}},
 152 {1,2,112,"blowfish_le-aes","lrw-benbi",
 153          {{"blowfish_le",64, 8,32,0,0},
 154           {"aes",        48,16,88,0,0}}},
 155 {1,3,160,"serpent-blowfish_le-aes","lrw-benbi",
 156           {{"serpent",    48,16, 32,0,0},
 157            {"blowfish_le",64, 8, 64,0,0},
 158            {"aes",        48,16,120,0,0}}},*/
 159
 160 /*
 161  * CBC + "outer" CBC (both with whitening)
 162  * chain_key_size: alg_keys_bytes + IV_seed_bytes + whitening_bytes
 163  */
 164 {1,1,32+16+16,"aes","cbc-tcw",
 165         {{"aes",    32,16,32,0,32}}},
 166 {1,1,32+16+16,"serpent","cbc-tcw",
 167         {{"serpent",32,16,32,0,32}}},
 168 {1,1,32+16+16,"twofish","cbc-tcw",
 169         {{"twofish",32,16,32,0,32}}},
 170 {1,2,64+16+16,"twofish-aes","cbci-tcrypt",
 171         {{"twofish",32,16,32,0,0},
 172          {"aes",    32,16,64,0,32}}},
 173 {1,3,96+16+16,"serpent-twofish-aes","cbci-tcrypt",
 174         {{"serpent",32,16,32,0,0},
 175          {"twofish",32,16,64,0,0},
 176          {"aes",    32,16,96,0,32}}},
 177 {1,2,64+16+16,"aes-serpent","cbci-tcrypt",
 178         {{"aes",    32,16,32,0,0},
 179          {"serpent",32,16,64,0,32}}},
 180 {1,3,96+16+16,"aes-twofish-serpent", "cbci-tcrypt",
 181         {{"aes",    32,16,32,0,0},
 182          {"twofish",32,16,64,0,0},
 183          {"serpent",32,16,96,0,32}}},
 184 {1,2,64+16+16,"serpent-twofish", "cbci-tcrypt",
 185         {{"serpent",32,16,32,0,0},
 186          {"twofish",32,16,64,0,32}}},
 187 {1,1,16+8+16,"cast5","cbc-tcw",
 188         {{"cast5",   16,8,32,0,24}}},
 189 {1,1,24+8+16,"des3_ede","cbc-tcw",
 190         {{"des3_ede",24,8,32,0,24}}},
 191 {1,1,56+8+16,"blowfish_le","cbc-tcrypt",
 192         {{"blowfish_le",56,8,32,0,24}}},
 193 {1,2,88+16+16,"blowfish_le-aes","cbc-tcrypt",
 194         {{"blowfish_le",56, 8,32,0,0},
 195          {"aes",        32,16,88,0,32}}},
 196 {1,3,120+16+16,"serpent-blowfish_le-aes","cbc-tcrypt",
 197         {{"serpent",    32,16, 32,0,0},
 198          {"blowfish_le",56, 8, 64,0,0},
 199          {"aes",        32,16,120,0,32}}},
 200 {}
 201 };
 202
 203 static int TCRYPT_hdr_from_disk(struct crypt_device *cd,
 204                                 struct tcrypt_phdr *hdr,
 205                                 struct crypt_params_tcrypt *params,
 206                                 int kdf_index, int cipher_index)
 207 {
 208         uint32_t crc32;
 209         size_t size;
 210
 211         /* Check CRC32 of header */
 212         size = TCRYPT_HDR_LEN - sizeof(hdr->d.keys) - sizeof(hdr->d.header_crc32);
 213         crc32 = crypt_crc32(~0, (unsigned char*)&hdr->d, size) ^ ~0;
 214         if (be16_to_cpu(hdr->d.version) > 3 &&
 215             crc32 != be32_to_cpu(hdr->d.header_crc32)) {
 216                 log_dbg(cd, "TCRYPT header CRC32 mismatch.");
 217                 return -EINVAL;
 218         }
 219
 220         /* Check CRC32 of keys */
 221         crc32 = crypt_crc32(~0, (unsigned char*)hdr->d.keys, sizeof(hdr->d.keys)) ^ ~0;
 222         if (crc32 != be32_to_cpu(hdr->d.keys_crc32)) {
 223                 log_dbg(cd, "TCRYPT keys CRC32 mismatch.");
 224                 return -EINVAL;
 225         }
 226
 227         /* Convert header to cpu format */
 228         hdr->d.version  =  be16_to_cpu(hdr->d.version);
 229         hdr->d.version_tc = be16_to_cpu(hdr->d.version_tc);
 230
 231         hdr->d.keys_crc32 = be32_to_cpu(hdr->d.keys_crc32);
 232
 233         hdr->d.hidden_volume_size = be64_to_cpu(hdr->d.hidden_volume_size);
 234         hdr->d.volume_size        = be64_to_cpu(hdr->d.volume_size);
 235
 236         hdr->d.mk_offset = be64_to_cpu(hdr->d.mk_offset);
 237         if (!hdr->d.mk_offset)
 238                 hdr->d.mk_offset = 512;
 239
 240         hdr->d.mk_size = be64_to_cpu(hdr->d.mk_size);
 241
 242         hdr->d.flags = be32_to_cpu(hdr->d.flags);
 243
 244         hdr->d.sector_size = be32_to_cpu(hdr->d.sector_size);
 245         if (!hdr->d.sector_size)
 246                 hdr->d.sector_size = 512;
 247
 248         hdr->d.header_crc32 = be32_to_cpu(hdr->d.header_crc32);
 249
 250         /* Set params */
 251         params->passphrase = NULL;
 252         params->passphrase_size = 0;
 253         params->hash_name  = tcrypt_kdf[kdf_index].hash;
 254         params->key_size = tcrypt_cipher[cipher_index].chain_key_size;
 255         params->cipher = tcrypt_cipher[cipher_index].long_name;
 256         params->mode = tcrypt_cipher[cipher_index].mode;
 257
 258         return 0;
 259 }
 260
 261 /*
 262  * Kernel implements just big-endian version of blowfish, hack it here
 263  */
 264 static void TCRYPT_swab_le(char *buf)
 265 {
 266         uint32_t *l = VOIDP_CAST(uint32_t*)&buf[0];
 267         uint32_t *r = VOIDP_CAST(uint32_t*)&buf[4];
 268         *l = swab32(*l);
 269         *r = swab32(*r);
 270 }
 271
 272 static int decrypt_blowfish_le_cbc(struct tcrypt_alg *alg,
 273                                    const char *key, char *buf)
 274 {
 275         int bs = alg->iv_size;
 276         char iv[8], iv_old[8];
 277         struct crypt_cipher *cipher = NULL;
 278         int i, j, r;
 279
 280         assert(bs == 8);
 281
 282         r = crypt_cipher_init(&cipher, "blowfish", "ecb",
 283                               &key[alg->key_offset], alg->key_size);
 284         if (r < 0)
 285                 return r;
 286
 287         memcpy(iv, &key[alg->iv_offset], alg->iv_size);
 288         for (i = 0; i < TCRYPT_HDR_LEN; i += bs) {
 289                 memcpy(iv_old, &buf[i], bs);
 290                 TCRYPT_swab_le(&buf[i]);
 291                 r = crypt_cipher_decrypt(cipher, &buf[i], &buf[i],
 292                                           bs, NULL, 0);
 293                 TCRYPT_swab_le(&buf[i]);
 294                 if (r < 0)
 295                         break;
 296                 for (j = 0; j < bs; j++)
 297                         buf[i + j] ^= iv[j];
 298                 memcpy(iv, iv_old, bs);
 299         }
 300
 301         crypt_cipher_destroy(cipher);
 302         crypt_safe_memzero(iv, bs);
 303         crypt_safe_memzero(iv_old, bs);
 304         return r;
 305 }
 306
 307 static void TCRYPT_remove_whitening(char *buf, const char *key)
 308 {
 309         int j;
 310
 311         for (j = 0; j < TCRYPT_HDR_LEN; j++)
 312                 buf[j] ^= key[j % 8];
 313 }
 314
 315 static void TCRYPT_copy_key(struct tcrypt_alg *alg, const char *mode,
 316                              char *out_key, const char *key)
 317 {
 318         int ks2;
 319         if (!strncmp(mode, "xts", 3)) {
 320                 ks2 = alg->key_size / 2;
 321                 memcpy(out_key, &key[alg->key_offset], ks2);
 322                 memcpy(&out_key[ks2], &key[alg->iv_offset], ks2);
 323         } else if (!strncmp(mode, "lrw", 3)) {
 324                 ks2 = alg->key_size - TCRYPT_LRW_IKEY_LEN;
 325                 memcpy(out_key, &key[alg->key_offset], ks2);
 326                 memcpy(&out_key[ks2], key, TCRYPT_LRW_IKEY_LEN);
 327         } else if (!strncmp(mode, "cbc", 3)) {
 328                 memcpy(out_key, &key[alg->key_offset], alg->key_size);
 329                 /* IV + whitening */
 330                 memcpy(&out_key[alg->key_size], &key[alg->iv_offset],
 331                        alg->key_extra_size);
 332         }
 333 }
 334
 335 static int TCRYPT_decrypt_hdr_one(struct tcrypt_alg *alg, const char *mode,
 336                                    const char *key,struct tcrypt_phdr *hdr)
 337 {
 338         char backend_key[TCRYPT_HDR_KEY_LEN];
 339         char iv[TCRYPT_HDR_IV_LEN] = {};
 340         char mode_name[MAX_CIPHER_LEN + 1];
 341         struct crypt_cipher *cipher;
 342         char *c, *buf = (char*)&hdr->e;
 343         int r;
 344
 345         /* Remove IV if present */
 346         mode_name[MAX_CIPHER_LEN] = '\0';
 347         strncpy(mode_name, mode, MAX_CIPHER_LEN);
 348         c = strchr(mode_name, '-');
 349         if (c)
 350                 *c = '\0';
 351
 352         if (!strncmp(mode, "lrw", 3))
 353                 iv[alg->iv_size - 1] = 1;
 354         else if (!strncmp(mode, "cbc", 3)) {
 355                 TCRYPT_remove_whitening(buf, &key[8]);
 356                 if (!strcmp(alg->name, "blowfish_le"))
 357                         return decrypt_blowfish_le_cbc(alg, key, buf);
 358                 memcpy(iv, &key[alg->iv_offset], alg->iv_size);
 359         }
 360
 361         TCRYPT_copy_key(alg, mode, backend_key, key);
 362         r = crypt_cipher_init(&cipher, alg->name, mode_name,
 363                               backend_key, alg->key_size);
 364         if (!r) {
 365                 r = crypt_cipher_decrypt(cipher, buf, buf, TCRYPT_HDR_LEN,
 366                                          iv, alg->iv_size);
 367                 crypt_cipher_destroy(cipher);
 368         }
 369
 370         crypt_safe_memzero(backend_key, sizeof(backend_key));
 371         crypt_safe_memzero(iv, TCRYPT_HDR_IV_LEN);
 372         return r;
 373 }
 374
 375 /*
 376  * For chained ciphers and CBC mode we need "outer" decryption.
 377  * Backend doesn't provide this, so implement it here directly using ECB.
 378  */
 379 static int TCRYPT_decrypt_cbci(struct tcrypt_algs *ciphers,
 380                                 const char *key, struct tcrypt_phdr *hdr)
 381 {
 382         struct crypt_cipher *cipher[3];
 383         unsigned int bs = ciphers->cipher[0].iv_size;
 384         char *buf = (char*)&hdr->e, iv[16], iv_old[16];
 385         unsigned int i, j;
 386         int r = -EINVAL;
 387
 388         assert(ciphers->chain_count <= 3);
 389         assert(bs <= 16);
 390
 391         TCRYPT_remove_whitening(buf, &key[8]);
 392
 393         memcpy(iv, &key[ciphers->cipher[0].iv_offset], bs);
 394
 395         /* Initialize all ciphers in chain in ECB mode */
 396         for (j = 0; j < ciphers->chain_count; j++)
 397                 cipher[j] = NULL;
 398         for (j = 0; j < ciphers->chain_count; j++) {
 399                 r = crypt_cipher_init(&cipher[j], ciphers->cipher[j].name, "ecb",
 400                                       &key[ciphers->cipher[j].key_offset],
 401                                       ciphers->cipher[j].key_size);
 402                 if (r < 0)
 403                         goto out;
 404         }
 405
 406         /* Implements CBC with chained ciphers in loop inside */
 407         for (i = 0; i < TCRYPT_HDR_LEN; i += bs) {
 408                 memcpy(iv_old, &buf[i], bs);
 409                 for (j = ciphers->chain_count; j > 0; j--) {
 410                         r = crypt_cipher_decrypt(cipher[j - 1], &buf[i], &buf[i],
 411                                                   bs, NULL, 0);
 412                         if (r < 0)
 413                                 goto out;
 414                 }
 415                 for (j = 0; j < bs; j++)
 416                         buf[i + j] ^= iv[j];
 417                 memcpy(iv, iv_old, bs);
 418         }
 419 out:
 420         for (j = 0; j < ciphers->chain_count; j++)
 421                 if (cipher[j])
 422                         crypt_cipher_destroy(cipher[j]);
 423
 424         crypt_safe_memzero(iv, bs);
 425         crypt_safe_memzero(iv_old, bs);
 426         return r;
 427 }
 428
 429 static int TCRYPT_decrypt_hdr(struct crypt_device *cd, struct tcrypt_phdr *hdr,
 430                                const char *key, struct crypt_params_tcrypt *params)
 431 {
 432         struct tcrypt_phdr hdr2;
 433         int i, j, r = -EINVAL;
 434
 435         for (i = 0; tcrypt_cipher[i].chain_count; i++) {
 436                 if (params->cipher && !strstr(tcrypt_cipher[i].long_name, params->cipher))
 437                         continue;
 438                 if (!(params->flags & CRYPT_TCRYPT_LEGACY_MODES) && tcrypt_cipher[i].legacy)
 439                         continue;
 440                 log_dbg(cd, "TCRYPT:  trying cipher %s-%s",
 441                         tcrypt_cipher[i].long_name, tcrypt_cipher[i].mode);
 442
 443                 memcpy(&hdr2.e, &hdr->e, TCRYPT_HDR_LEN);
 444
 445                 if (!strncmp(tcrypt_cipher[i].mode, "cbci", 4))
 446                         r = TCRYPT_decrypt_cbci(&tcrypt_cipher[i], key, &hdr2);
 447                 else for (j = tcrypt_cipher[i].chain_count - 1; j >= 0 ; j--) {
 448                         if (!tcrypt_cipher[i].cipher[j].name)
 449                                 continue;
 450                         r = TCRYPT_decrypt_hdr_one(&tcrypt_cipher[i].cipher[j],
 451                                             tcrypt_cipher[i].mode, key, &hdr2);
 452                         if (r < 0)
 453                                 break;
 454                 }
 455
 456                 if (r < 0) {
 457                         log_dbg(cd, "TCRYPT:   returned error %d, skipped.", r);
 458                         if (r == -ENOTSUP)
 459                                 break;
 460                         r = -ENOENT;
 461                         continue;
 462                 }
 463
 464                 if (!strncmp(hdr2.d.magic, TCRYPT_HDR_MAGIC, TCRYPT_HDR_MAGIC_LEN)) {
 465                         log_dbg(cd, "TCRYPT: Signature magic detected.");
 466                         memcpy(&hdr->e, &hdr2.e, TCRYPT_HDR_LEN);
 467                         r = i;
 468                         break;
 469                 }
 470                 if ((params->flags & CRYPT_TCRYPT_VERA_MODES) &&
 471                      !strncmp(hdr2.d.magic, VCRYPT_HDR_MAGIC, TCRYPT_HDR_MAGIC_LEN)) {
 472                         log_dbg(cd, "TCRYPT: Signature magic detected (Veracrypt).");
 473                         memcpy(&hdr->e, &hdr2.e, TCRYPT_HDR_LEN);
 474                         r = i;
 475                         break;
 476                 }
 477                 r = -EPERM;
 478         }
 479
 480         crypt_safe_memzero(&hdr2, sizeof(hdr2));
 481         return r;
 482 }
 483
 484 static int TCRYPT_pool_keyfile(struct crypt_device *cd,
 485                                 unsigned char pool[VCRYPT_KEY_POOL_LEN],
 486                                 const char *keyfile, int keyfiles_pool_length)
 487 {
 488         unsigned char *data;
 489         int i, j, fd, data_size, r = -EIO;
 490         uint32_t crc;
 491
 492         log_dbg(cd, "TCRYPT: using keyfile %s.", keyfile);
 493
 494         data = malloc(TCRYPT_KEYFILE_LEN);
 495         if (!data)
 496                 return -ENOMEM;
 497         memset(data, 0, TCRYPT_KEYFILE_LEN);
 498
 499         fd = open(keyfile, O_RDONLY);
 500         if (fd < 0) {
 501                 log_err(cd, _("Failed to open key file."));
 502                 goto out;
 503         }
 504
 505         data_size = read_buffer(fd, data, TCRYPT_KEYFILE_LEN);
 506         close(fd);
 507         if (data_size < 0) {
 508                 log_err(cd, _("Error reading keyfile %s."), keyfile);
 509                 goto out;
 510         }
 511
 512         for (i = 0, j = 0, crc = ~0U; i < data_size; i++) {
 513                 crc = crypt_crc32(crc, &data[i], 1);
 514                 pool[j++] += (unsigned char)(crc >> 24);
 515                 pool[j++] += (unsigned char)(crc >> 16);
 516                 pool[j++] += (unsigned char)(crc >>  8);
 517                 pool[j++] += (unsigned char)(crc);
 518                 j %= keyfiles_pool_length;
 519         }
 520         r = 0;
 521 out:
 522         crypt_safe_memzero(&crc, sizeof(crc));
 523         crypt_safe_memzero(data, TCRYPT_KEYFILE_LEN);
 524         free(data);
 525
 526         return r;
 527 }
 528
 529 static int TCRYPT_init_hdr(struct crypt_device *cd,
 530                            struct tcrypt_phdr *hdr,
 531                            struct crypt_params_tcrypt *params)
 532 {
 533         unsigned char pwd[VCRYPT_KEY_POOL_LEN] = {};
 534         size_t passphrase_size, max_passphrase_size;
 535         char *key;
 536         unsigned int i, skipped = 0, iterations;
 537         int r = -EPERM, keyfiles_pool_length;
 538
 539         if (posix_memalign((void*)&key, crypt_getpagesize(), TCRYPT_HDR_KEY_LEN))
 540                 return -ENOMEM;
 541
 542         if (params->flags & CRYPT_TCRYPT_VERA_MODES &&
 543             params->passphrase_size > TCRYPT_KEY_POOL_LEN) {
 544                 /* Really. Keyfile pool length depends on passphrase size in Veracrypt. */
 545                 max_passphrase_size = VCRYPT_KEY_POOL_LEN;
 546                 keyfiles_pool_length = VCRYPT_KEY_POOL_LEN;
 547         } else {
 548                 max_passphrase_size = TCRYPT_KEY_POOL_LEN;
 549                 keyfiles_pool_length = TCRYPT_KEY_POOL_LEN;
 550         }
 551
 552         if (params->keyfiles_count)
 553                 passphrase_size = max_passphrase_size;
 554         else
 555                 passphrase_size = params->passphrase_size;
 556
 557         if (params->passphrase_size > max_passphrase_size) {
 558                 log_err(cd, _("Maximum TCRYPT passphrase length (%zu) exceeded."),
 559                               max_passphrase_size);
 560                 goto out;
 561         }
 562
 563         /* Calculate pool content from keyfiles */
 564         for (i = 0; i < params->keyfiles_count; i++) {
 565                 r = TCRYPT_pool_keyfile(cd, pwd, params->keyfiles[i], keyfiles_pool_length);
 566                 if (r < 0)
 567                         goto out;
 568         }
 569
 570         /* If provided password, combine it with pool */
 571         for (i = 0; i < params->passphrase_size; i++)
 572                 pwd[i] += params->passphrase[i];
 573
 574         for (i = 0; tcrypt_kdf[i].name; i++) {
 575                 if (params->hash_name && strcmp(params->hash_name, tcrypt_kdf[i].hash))
 576                         continue;
 577                 if (!(params->flags & CRYPT_TCRYPT_LEGACY_MODES) && tcrypt_kdf[i].legacy)
 578                         continue;
 579                 if (!(params->flags & CRYPT_TCRYPT_VERA_MODES) && tcrypt_kdf[i].veracrypt)
 580                         continue;
 581                 if ((params->flags & CRYPT_TCRYPT_VERA_MODES) && params->veracrypt_pim) {
 582                         /* Do not try TrueCrypt modes if we have PIM value */
 583                         if (!tcrypt_kdf[i].veracrypt)
 584                                 continue;
 585                         /* adjust iterations to given PIM cmdline parameter */
 586                         iterations = tcrypt_kdf[i].veracrypt_pim_const +
 587                                     (tcrypt_kdf[i].veracrypt_pim_mult * params->veracrypt_pim);
 588                 } else
 589                         iterations = tcrypt_kdf[i].iterations;
 590                 /* Derive header key */
 591                 log_dbg(cd, "TCRYPT: trying KDF: %s-%s-%d%s.",
 592                         tcrypt_kdf[i].name, tcrypt_kdf[i].hash, tcrypt_kdf[i].iterations,
 593                         params->veracrypt_pim && tcrypt_kdf[i].veracrypt ? "-PIM" : "");
 594                 r = crypt_pbkdf(tcrypt_kdf[i].name, tcrypt_kdf[i].hash,
 595                                 (char*)pwd, passphrase_size,
 596                                 hdr->salt, TCRYPT_HDR_SALT_LEN,
 597                                 key, TCRYPT_HDR_KEY_LEN,
 598                                 iterations, 0, 0);
 599                 if (r < 0) {
 600                         log_verbose(cd, _("PBKDF2 hash algorithm %s not available, skipping."),
 601                                       tcrypt_kdf[i].hash);
 602                         skipped++;
 603                         r = -EPERM;
 604                         continue;
 605                 }
 606
 607                 /* Decrypt header */
 608                 r = TCRYPT_decrypt_hdr(cd, hdr, key, params);
 609                 if (r == -ENOENT) {
 610                         skipped++;
 611                         r = -EPERM;
 612                         continue;
 613                 }
 614                 if (r != -EPERM)
 615                         break;
 616         }
 617
 618         if ((r < 0 && skipped && skipped == i) || r == -ENOTSUP) {
 619                 log_err(cd, _("Required kernel crypto interface not available."));
 620 #ifdef ENABLE_AF_ALG
 621                 log_err(cd, _("Ensure you have algif_skcipher kernel module loaded."));
 622 #endif
 623                 r = -ENOTSUP;
 624         }
 625         if (r < 0)
 626                 goto out;
 627
 628         r = TCRYPT_hdr_from_disk(cd, hdr, params, i, r);
 629         if (!r) {
 630                 log_dbg(cd, "TCRYPT: Magic: %s, Header version: %d, req. %d, sector %d"
 631                         ", mk_offset %" PRIu64 ", hidden_size %" PRIu64
 632                         ", volume size %" PRIu64, tcrypt_kdf[i].veracrypt ?
 633                         VCRYPT_HDR_MAGIC : TCRYPT_HDR_MAGIC,
 634                         (int)hdr->d.version, (int)hdr->d.version_tc, (int)hdr->d.sector_size,
 635                         hdr->d.mk_offset, hdr->d.hidden_volume_size, hdr->d.volume_size);
 636                 log_dbg(cd, "TCRYPT: Header cipher %s-%s, key size %zu",
 637                         params->cipher, params->mode, params->key_size);
 638         }
 639 out:
 640         crypt_safe_memzero(pwd, TCRYPT_KEY_POOL_LEN);
 641         if (key)
 642                 crypt_safe_memzero(key, TCRYPT_HDR_KEY_LEN);
 643         free(key);
 644         return r;
 645 }
 646
 647 int TCRYPT_read_phdr(struct crypt_device *cd,
 648                      struct tcrypt_phdr *hdr,
 649                      struct crypt_params_tcrypt *params)
 650 {
 651         struct device *base_device = NULL, *device = crypt_metadata_device(cd);
 652         ssize_t hdr_size = sizeof(struct tcrypt_phdr);
 653         char *base_device_path;
 654         int devfd, r;
 655
 656         assert(sizeof(struct tcrypt_phdr) == 512);
 657
 658         log_dbg(cd, "Reading TCRYPT header of size %zu bytes from device %s.",
 659                 hdr_size, device_path(device));
 660
 661         if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER &&
 662             crypt_dev_is_partition(device_path(device))) {
 663                 base_device_path = crypt_get_base_device(device_path(device));
 664
 665                 log_dbg(cd, "Reading TCRYPT system header from device %s.", base_device_path ?: "?");
 666                 if (!base_device_path)
 667                         return -EINVAL;
 668
 669                 r = device_alloc(cd, &base_device, base_device_path);
 670                 free(base_device_path);
 671                 if (r < 0)
 672                         return r;
 673                 devfd = device_open(cd, base_device, O_RDONLY);
 674         } else
 675                 devfd = device_open(cd, device, O_RDONLY);
 676
 677         if (devfd < 0) {
 678                 device_free(cd, base_device);
 679                 log_err(cd, _("Cannot open device %s."), device_path(device));
 680                 return -EINVAL;
 681         }
 682
 683         r = -EIO;
 684         if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER) {
 685                 if (read_lseek_blockwise(devfd, device_block_size(cd, device),
 686                         device_alignment(device), hdr, hdr_size,
 687                         TCRYPT_HDR_SYSTEM_OFFSET) == hdr_size) {
 688                         r = TCRYPT_init_hdr(cd, hdr, params);
 689                 }
 690         } else if (params->flags & CRYPT_TCRYPT_HIDDEN_HEADER) {
 691                 if (params->flags & CRYPT_TCRYPT_BACKUP_HEADER) {
 692                         if (read_lseek_blockwise(devfd, device_block_size(cd, device),
 693                                 device_alignment(device), hdr, hdr_size,
 694                                 TCRYPT_HDR_HIDDEN_OFFSET_BCK) == hdr_size)
 695                                 r = TCRYPT_init_hdr(cd, hdr, params);
 696                 } else {
 697                         if (read_lseek_blockwise(devfd, device_block_size(cd, device),
 698                                 device_alignment(device), hdr, hdr_size,
 699                                 TCRYPT_HDR_HIDDEN_OFFSET) == hdr_size)
 700                                 r = TCRYPT_init_hdr(cd, hdr, params);
 701                         if (r && read_lseek_blockwise(devfd, device_block_size(cd, device),
 702                                 device_alignment(device), hdr, hdr_size,
 703                                 TCRYPT_HDR_HIDDEN_OFFSET_OLD) == hdr_size)
 704                                 r = TCRYPT_init_hdr(cd, hdr, params);
 705                 }
 706         } else if (params->flags & CRYPT_TCRYPT_BACKUP_HEADER) {
 707                 if (read_lseek_blockwise(devfd, device_block_size(cd, device),
 708                         device_alignment(device), hdr, hdr_size,
 709                         TCRYPT_HDR_OFFSET_BCK) == hdr_size)
 710                         r = TCRYPT_init_hdr(cd, hdr, params);
 711         } else if (read_lseek_blockwise(devfd, device_block_size(cd, device),
 712                         device_alignment(device), hdr, hdr_size, 0) == hdr_size)
 713                 r = TCRYPT_init_hdr(cd, hdr, params);
 714
 715         device_free(cd, base_device);
 716         if (r < 0)
 717                 memset(hdr, 0, sizeof (*hdr));
 718         return r;
 719 }
 720
 721 static struct tcrypt_algs *TCRYPT_get_algs(const char *cipher, const char *mode)
 722 {
 723         int i;
 724
 725         if (!cipher || !mode)
 726                 return NULL;
 727
 728         for (i = 0; tcrypt_cipher[i].chain_count; i++)
 729                 if (!strcmp(tcrypt_cipher[i].long_name, cipher) &&
 730                     !strcmp(tcrypt_cipher[i].mode, mode))
 731                     return &tcrypt_cipher[i];
 732
 733         return NULL;
 734 }
 735
 736 int TCRYPT_activate(struct crypt_device *cd,
 737                      const char *name,
 738                      struct tcrypt_phdr *hdr,
 739                      struct crypt_params_tcrypt *params,
 740                      uint32_t flags)
 741 {
 742         char dm_name[PATH_MAX], dm_dev_name[PATH_MAX], cipher_spec[MAX_CIPHER_LEN*2+1];
 743         char *part_path;
 744         unsigned int i;
 745         int r;
 746         uint32_t req_flags, dmc_flags;
 747         struct tcrypt_algs *algs;
 748         enum devcheck device_check;
 749         uint64_t offset = crypt_get_data_offset(cd);
 750         struct volume_key *vk = NULL;
 751         struct device  *ptr_dev = crypt_data_device(cd), *device = NULL, *part_device = NULL;
 752         struct crypt_dm_active_device dmd = {
 753                 .flags = flags
 754         };
 755
 756         if (!hdr->d.version) {
 757                 log_dbg(cd, "TCRYPT: this function is not supported without encrypted header load.");
 758                 return -ENOTSUP;
 759         }
 760
 761         if (hdr->d.sector_size % SECTOR_SIZE) {
 762                 log_err(cd, _("Activation is not supported for %d sector size."),
 763                         hdr->d.sector_size);
 764                 return -ENOTSUP;
 765         }
 766
 767         if (strstr(params->mode, "-tcrypt")) {
 768                 log_err(cd, _("Kernel does not support activation for this TCRYPT legacy mode."));
 769                 return -ENOTSUP;
 770         }
 771
 772         if (strstr(params->mode, "-tcw"))
 773                 req_flags = DM_TCW_SUPPORTED;
 774         else
 775                 req_flags = DM_PLAIN64_SUPPORTED;
 776
 777         algs = TCRYPT_get_algs(params->cipher, params->mode);
 778         if (!algs)
 779                 return -EINVAL;
 780
 781         if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER)
 782                 dmd.size = 0;
 783         else if (params->flags & CRYPT_TCRYPT_HIDDEN_HEADER)
 784                 dmd.size = hdr->d.hidden_volume_size / SECTOR_SIZE;
 785         else
 786                 dmd.size = hdr->d.volume_size / SECTOR_SIZE;
 787
 788         if (dmd.flags & CRYPT_ACTIVATE_SHARED)
 789                 device_check = DEV_OK;
 790         else
 791                 device_check = DEV_EXCL;
 792
 793         if ((params->flags & CRYPT_TCRYPT_SYSTEM_HEADER) &&
 794              !crypt_dev_is_partition(device_path(crypt_data_device(cd)))) {
 795                 part_path = crypt_get_partition_device(device_path(crypt_data_device(cd)),
 796                                                        crypt_get_data_offset(cd), dmd.size);
 797                 if (part_path) {
 798                         if (!device_alloc(cd, &part_device, part_path)) {
 799                                 log_verbose(cd, _("Activating TCRYPT system encryption for partition %s."),
 800                                             part_path);
 801                                 ptr_dev = part_device;
 802                                 offset = 0;
 803                         }
 804                         free(part_path);
 805                 } else
 806                         /*
 807                          * System encryption use the whole device mapping, there can
 808                          * be active partitions.
 809                          */
 810                         device_check = DEV_OK;
 811         }
 812
 813         r = device_block_adjust(cd, ptr_dev, device_check,
 814                                 offset, &dmd.size, &dmd.flags);
 815         if (r)
 816                 goto out;
 817
 818         /* From here, key size for every cipher must be the same */
 819         vk = crypt_alloc_volume_key(algs->cipher[0].key_size +
 820                                     algs->cipher[0].key_extra_size, NULL);
 821         if (!vk) {
 822                 r = -ENOMEM;
 823                 goto out;
 824         }
 825
 826         for (i = algs->chain_count; i > 0; i--) {
 827                 if (i == 1) {
 828                         dm_name[sizeof(dm_name)-1] = '\0';
 829                         strncpy(dm_name, name, sizeof(dm_name)-1);
 830                         dmd.flags = flags;
 831                 } else {
 832                         if (snprintf(dm_name, sizeof(dm_name), "%s_%d", name, i-1) < 0) {
 833                                 r = -EINVAL;
 834                                 break;
 835                         }
 836                         dmd.flags = flags | CRYPT_ACTIVATE_PRIVATE;
 837                 }
 838
 839                 TCRYPT_copy_key(&algs->cipher[i-1], algs->mode,
 840                                 vk->key, hdr->d.keys);
 841
 842                 if (algs->chain_count != i) {
 843                         if (snprintf(dm_dev_name, sizeof(dm_dev_name), "%s/%s_%d", dm_get_dir(), name, i) < 0) {
 844                                 r = -EINVAL;
 845                                 break;
 846                         }
 847                         r = device_alloc(cd, &device, dm_dev_name);
 848                         if (r)
 849                                 break;
 850                         ptr_dev = device;
 851                         offset = 0;
 852                 }
 853
 854                 r = snprintf(cipher_spec, sizeof(cipher_spec), "%s-%s", algs->cipher[i-1].name, algs->mode);
 855                 if (r < 0 || (size_t)r >= sizeof(cipher_spec)) {
 856                         r = -ENOMEM;
 857                         break;
 858                 }
 859
 860                 r = dm_crypt_target_set(&dmd.segment, 0, dmd.size, ptr_dev, vk,
 861                                 cipher_spec, crypt_get_iv_offset(cd), offset,
 862                                 crypt_get_integrity(cd),
 863                                 crypt_get_integrity_tag_size(cd),
 864                                 crypt_get_sector_size(cd));
 865                 if (r)
 866                         break;
 867
 868                 log_dbg(cd, "Trying to activate TCRYPT device %s using cipher %s.",
 869                         dm_name, dmd.segment.u.crypt.cipher);
 870                 r = dm_create_device(cd, dm_name, CRYPT_TCRYPT, &dmd);
 871
 872                 dm_targets_free(cd, &dmd);
 873                 device_free(cd, device);
 874                 device = NULL;
 875
 876                 if (r)
 877                         break;
 878         }
 879
 880         if (r < 0 &&
 881             (dm_flags(cd, DM_CRYPT, &dmc_flags) || ((dmc_flags & req_flags) != req_flags))) {
 882                 log_err(cd, _("Kernel does not support TCRYPT compatible mapping."));
 883                 r = -ENOTSUP;
 884         }
 885
 886 out:
 887         crypt_free_volume_key(vk);
 888         device_free(cd, device);
 889         device_free(cd, part_device);
 890         return r;
 891 }
 892
 893 static int TCRYPT_remove_one(struct crypt_device *cd, const char *name,
 894                       const char *base_uuid, int index, uint32_t flags)
 895 {
 896         struct crypt_dm_active_device dmd;
 897         char dm_name[PATH_MAX];
 898         int r;
 899
 900         if (snprintf(dm_name, sizeof(dm_name), "%s_%d", name, index) < 0)
 901                 return -ENOMEM;
 902
 903         r = dm_status_device(cd, dm_name);
 904         if (r < 0)
 905                 return r;
 906
 907         r = dm_query_device(cd, dm_name, DM_ACTIVE_UUID, &dmd);
 908         if (!r && !strncmp(dmd.uuid, base_uuid, strlen(base_uuid)))
 909                 r = dm_remove_device(cd, dm_name, flags);
 910
 911         free(CONST_CAST(void*)dmd.uuid);
 912         return r;
 913 }
 914
 915 int TCRYPT_deactivate(struct crypt_device *cd, const char *name, uint32_t flags)
 916 {
 917         struct crypt_dm_active_device dmd;
 918         int r;
 919
 920         r = dm_query_device(cd, name, DM_ACTIVE_UUID, &dmd);
 921         if (r < 0)
 922                 return r;
 923         if (!dmd.uuid)
 924                 return -EINVAL;
 925
 926         r = dm_remove_device(cd, name, flags);
 927         if (r < 0)
 928                 goto out;
 929
 930         r = TCRYPT_remove_one(cd, name, dmd.uuid, 1, flags);
 931         if (r < 0)
 932                 goto out;
 933
 934         r = TCRYPT_remove_one(cd, name, dmd.uuid, 2, flags);
 935 out:
 936         free(CONST_CAST(void*)dmd.uuid);
 937         return (r == -ENODEV) ? 0 : r;
 938 }
 939
 940 static int TCRYPT_status_one(struct crypt_device *cd, const char *name,
 941                              const char *base_uuid, int index,
 942                              size_t *key_size, char *cipher,
 943                              struct tcrypt_phdr *tcrypt_hdr,
 944                              struct device **device)
 945 {
 946         struct crypt_dm_active_device dmd;
 947         struct dm_target *tgt = &dmd.segment;
 948         char dm_name[PATH_MAX], *c;
 949         int r;
 950
 951         if (snprintf(dm_name, sizeof(dm_name), "%s_%d", name, index) < 0)
 952                 return -ENOMEM;
 953
 954         r = dm_status_device(cd, dm_name);
 955         if (r < 0)
 956                 return r;
 957
 958         r = dm_query_device(cd, dm_name, DM_ACTIVE_DEVICE |
 959                                           DM_ACTIVE_UUID |
 960                                           DM_ACTIVE_CRYPT_CIPHER |
 961                                           DM_ACTIVE_CRYPT_KEYSIZE, &dmd);
 962         if (r < 0)
 963                 return r;
 964         if (!single_segment(&dmd) || tgt->type != DM_CRYPT) {
 965                 r = -ENOTSUP;
 966                 goto out;
 967         }
 968
 969         r = 0;
 970
 971         if (!strncmp(dmd.uuid, base_uuid, strlen(base_uuid))) {
 972                 if ((c = strchr(tgt->u.crypt.cipher, '-')))
 973                         *c = '\0';
 974                 strcat(cipher, "-");
 975                 strncat(cipher, tgt->u.crypt.cipher, MAX_CIPHER_LEN);
 976                 *key_size += tgt->u.crypt.vk->keylength;
 977                 tcrypt_hdr->d.mk_offset = tgt->u.crypt.offset * SECTOR_SIZE;
 978                 device_free(cd, *device);
 979                 MOVE_REF(*device, tgt->data_device);
 980         } else
 981                 r = -ENODEV;
 982 out:
 983         dm_targets_free(cd, &dmd);
 984         free(CONST_CAST(void*)dmd.uuid);
 985         return r;
 986 }
 987
 988 int TCRYPT_init_by_name(struct crypt_device *cd, const char *name,
 989                         const char *uuid,
 990                         const struct dm_target *tgt,
 991                         struct device **device,
 992                         struct crypt_params_tcrypt *tcrypt_params,
 993                         struct tcrypt_phdr *tcrypt_hdr)
 994 {
 995         struct tcrypt_algs *algs;
 996         char cipher[MAX_CIPHER_LEN * 4], mode[MAX_CIPHER_LEN+1], *tmp;
 997         size_t key_size;
 998         int r;
 999
1000         memset(tcrypt_params, 0, sizeof(*tcrypt_params));
1001         memset(tcrypt_hdr, 0, sizeof(*tcrypt_hdr));
1002         tcrypt_hdr->d.sector_size = SECTOR_SIZE;
1003         tcrypt_hdr->d.mk_offset = tgt->u.crypt.offset * SECTOR_SIZE;
1004
1005         strncpy(cipher, tgt->u.crypt.cipher, MAX_CIPHER_LEN);
1006         tmp = strchr(cipher, '-');
1007         if (!tmp)
1008                 return -EINVAL;
1009         *tmp = '\0';
1010         mode[MAX_CIPHER_LEN] = '\0';
1011         strncpy(mode, ++tmp, MAX_CIPHER_LEN);
1012
1013         key_size = tgt->u.crypt.vk->keylength;
1014         r = TCRYPT_status_one(cd, name, uuid, 1, &key_size,
1015                               cipher, tcrypt_hdr, device);
1016         if (!r)
1017                 r = TCRYPT_status_one(cd, name, uuid, 2, &key_size,
1018                                       cipher, tcrypt_hdr, device);
1019
1020         if (r < 0 && r != -ENODEV)
1021                 return r;
1022
1023         algs = TCRYPT_get_algs(cipher, mode);
1024         if (!algs || key_size != algs->chain_key_size)
1025                 return -EINVAL;
1026
1027         tcrypt_params->key_size = algs->chain_key_size;
1028         tcrypt_params->cipher = algs->long_name;
1029         tcrypt_params->mode = algs->mode;
1030         return 0;
1031 }
1032
1033 uint64_t TCRYPT_get_data_offset(struct crypt_device *cd,
1034                                  struct tcrypt_phdr *hdr,
1035                                  struct crypt_params_tcrypt *params)
1036 {
1037         uint64_t size;
1038
1039         if (!hdr->d.version) {
1040                 /* No real header loaded, initialized by active device, use default mk_offset */
1041         } else if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER) {
1042                 /* Mapping through whole device, not partition! */
1043                 if (crypt_dev_is_partition(device_path(crypt_data_device(cd))))
1044                         return 0;
1045         } else if (params->mode && !strncmp(params->mode, "xts", 3)) {
1046                 if (hdr->d.version < 3)
1047                         return 1;
1048
1049                 if (params->flags & CRYPT_TCRYPT_HIDDEN_HEADER) {
1050                         if (hdr->d.version > 3)
1051                                 return (hdr->d.mk_offset / SECTOR_SIZE);
1052                         if (device_size(crypt_metadata_device(cd), &size) < 0)
1053                                 return 0;
1054                         return (size - hdr->d.hidden_volume_size +
1055                                 (TCRYPT_HDR_HIDDEN_OFFSET_OLD)) / SECTOR_SIZE;
1056                 }
1057         } else if (params->flags & CRYPT_TCRYPT_HIDDEN_HEADER) {
1058                 if (device_size(crypt_metadata_device(cd), &size) < 0)
1059                         return 0;
1060                 return (size - hdr->d.hidden_volume_size +
1061                         (TCRYPT_HDR_HIDDEN_OFFSET_OLD)) / SECTOR_SIZE;
1062         }
1063
1064         return hdr->d.mk_offset / SECTOR_SIZE;
1065 }
1066
1067 uint64_t TCRYPT_get_iv_offset(struct crypt_device *cd,
1068                               struct tcrypt_phdr *hdr,
1069                               struct crypt_params_tcrypt *params)
1070 {
1071         uint64_t iv_offset;
1072
1073         if (params->mode && !strncmp(params->mode, "xts", 3))
1074                 iv_offset = TCRYPT_get_data_offset(cd, hdr, params);
1075         else if (params->mode && !strncmp(params->mode, "lrw", 3))
1076                 iv_offset = 0;
1077         else
1078                 iv_offset = hdr->d.mk_offset / SECTOR_SIZE;
1079
1080         if (params->flags & CRYPT_TCRYPT_SYSTEM_HEADER)
1081                 iv_offset += crypt_dev_partition_offset(device_path(crypt_data_device(cd)));
1082
1083         return iv_offset;
1084 }
1085
1086 int TCRYPT_get_volume_key(struct crypt_device *cd,
1087                           struct tcrypt_phdr *hdr,
1088                           struct crypt_params_tcrypt *params,
1089                           struct volume_key **vk)
1090 {
1091         struct tcrypt_algs *algs;
1092         unsigned int i, key_index;
1093
1094         if (!hdr->d.version) {
1095                 log_err(cd, _("This function is not supported without TCRYPT header load."));
1096                 return -ENOTSUP;
1097         }
1098
1099         algs = TCRYPT_get_algs(params->cipher, params->mode);
1100         if (!algs)
1101                 return -EINVAL;
1102
1103         *vk = crypt_alloc_volume_key(params->key_size, NULL);
1104         if (!*vk)
1105                 return -ENOMEM;
1106
1107         for (i = 0, key_index = 0; i < algs->chain_count; i++) {
1108                 TCRYPT_copy_key(&algs->cipher[i], algs->mode,
1109                                 &(*vk)->key[key_index], hdr->d.keys);
1110                 key_index += algs->cipher[i].key_size;
1111         }
1112
1113         return 0;
1114 }
1115
1116 int TCRYPT_dump(struct crypt_device *cd,
1117                 struct tcrypt_phdr *hdr,
1118                 struct crypt_params_tcrypt *params)
1119 {
1120         log_std(cd, "%s header information for %s\n",
1121                 hdr->d.magic[0] == 'T' ? "TCRYPT" : "VERACRYPT",
1122                 device_path(crypt_metadata_device(cd)));
1123         if (hdr->d.version) {
1124                 log_std(cd, "Version:       \t%d\n", hdr->d.version);
1125                 log_std(cd, "Driver req.:\t%x.%x\n", hdr->d.version_tc >> 8,
1126                                                     hdr->d.version_tc & 0xFF);
1127
1128                 log_std(cd, "Sector size:\t%" PRIu32 "\n", hdr->d.sector_size);
1129                 log_std(cd, "MK offset:\t%" PRIu64 "\n", hdr->d.mk_offset);
1130                 log_std(cd, "PBKDF2 hash:\t%s\n", params->hash_name);
1131         }
1132         log_std(cd, "Cipher chain:\t%s\n", params->cipher);
1133         log_std(cd, "Cipher mode:\t%s\n", params->mode);
1134         log_std(cd, "MK bits:       \t%zu\n", params->key_size * 8);
1135         return 0;
1136 }