2 * LUKS - Linux Unified Key Setup
4 * Copyright (C) 2004-2006, Clemens Fruhwirth <clemens@endorphin.org>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <sys/types.h>
22 #include <sys/ioctl.h>
23 #include <netinet/in.h>
37 #include <../lib/internal.h>
39 #define div_round_up(a,b) ({ \
40 typeof(a) __a = (a); \
41 typeof(b) __b = (b); \
42 (__a - 1) / __b + 1; \
45 static inline int round_up_modulo(int x, int m) {
46 return div_round_up(x, m) * m;
49 struct luks_masterkey *LUKS_alloc_masterkey(int keylength, const char *key)
51 struct luks_masterkey *mk=malloc(sizeof(*mk) + keylength);
52 if(NULL == mk) return NULL;
53 mk->keyLength=keylength;
55 memcpy(&mk->key, key, keylength);
59 void LUKS_dealloc_masterkey(struct luks_masterkey *mk)
62 memset(mk->key,0,mk->keyLength);
68 struct luks_masterkey *LUKS_generate_masterkey(int keylength)
70 struct luks_masterkey *mk=LUKS_alloc_masterkey(keylength, NULL);
71 if(NULL == mk) return NULL;
73 int r = getRandom(mk->key,keylength);
75 LUKS_dealloc_masterkey(mk);
82 const char *backup_file,
84 struct luks_phdr *hdr,
85 struct crypt_device *ctx)
87 int r = 0, devfd = -1;
92 if(stat(backup_file, &st) == 0) {
93 log_err(ctx, _("Requested file %s already exist.\n"), backup_file);
97 r = LUKS_read_phdr(device, hdr, 0, ctx);
101 buffer_size = hdr->payloadOffset << SECTOR_SHIFT;
102 buffer = safe_alloc(buffer_size);
103 if (!buffer || buffer_size < LUKS_ALIGN_KEYSLOTS) {
108 log_dbg("Storing backup of header (%u bytes) and keyslot area (%u bytes).",
109 sizeof(*hdr), buffer_size - LUKS_ALIGN_KEYSLOTS);
111 devfd = open(device, O_RDONLY | O_DIRECT | O_SYNC);
113 log_err(ctx, _("Device %s is not a valid LUKS device.\n"), device);
118 if(read_blockwise(devfd, buffer, buffer_size) < buffer_size) {
124 /* Wipe unused area, so backup cannot contain old signatures */
125 memset(buffer + sizeof(*hdr), 0, LUKS_ALIGN_KEYSLOTS - sizeof(*hdr));
127 devfd = creat(backup_file, S_IRUSR);
132 if(write(devfd, buffer, buffer_size) < buffer_size) {
133 log_err(ctx, _("Cannot write header backup file %s.\n"), backup_file);
147 int LUKS_hdr_restore(
148 const char *backup_file,
150 struct luks_phdr *hdr,
151 struct crypt_device *ctx)
153 int r = 0, devfd = -1, diff_uuid = 0;
155 char *buffer = NULL, msg[200];
157 struct luks_phdr hdr_file;
159 if(stat(backup_file, &st) < 0) {
160 log_err(ctx, _("Backup file %s doesn't exist.\n"), backup_file);
164 r = LUKS_read_phdr_backup(backup_file, device, &hdr_file, 0, ctx);
165 buffer_size = hdr_file.payloadOffset << SECTOR_SHIFT;
167 if (r || buffer_size < LUKS_ALIGN_KEYSLOTS) {
168 log_err(ctx, _("Backup file do not contain valid LUKS header.\n"));
173 buffer = safe_alloc(buffer_size);
179 devfd = open(backup_file, O_RDONLY);
181 log_err(ctx, _("Cannot open header backup file %s.\n"), backup_file);
186 if(read(devfd, buffer, buffer_size) < buffer_size) {
187 log_err(ctx, _("Cannot read header backup file %s.\n"), backup_file);
193 r = LUKS_read_phdr(device, hdr, 0, ctx);
195 log_dbg("Device %s already contains LUKS header, checking UUID and offset.", device);
196 if(hdr->payloadOffset != hdr_file.payloadOffset ||
197 hdr->keyBytes != hdr_file.keyBytes) {
198 log_err(ctx, _("Data offset or key size differs on device and backup, restore failed.\n"));
202 if (memcmp(hdr->uuid, hdr_file.uuid, UUID_STRING_L))
206 if (snprintf(msg, sizeof(msg), _("Device %s %s%s"), device,
207 r ? _("does not contain LUKS header. Replacing header can destroy data on that device.") :
208 _("already contains LUKS header. Replacing header will destroy existing keyslots."),
209 diff_uuid ? _("\nWARNING: real device header has different UUID than backup!") : "") < 0) {
214 if (!crypt_confirm(ctx, msg)) {
219 log_dbg("Storing backup of header (%u bytes) and keyslot area (%u bytes) to device %s.",
220 sizeof(*hdr), buffer_size - LUKS_ALIGN_KEYSLOTS, device);
222 devfd = open(device, O_WRONLY | O_DIRECT | O_SYNC);
224 log_err(ctx, _("Cannot open device %s.\n"), device);
229 if(write_blockwise(devfd, buffer, buffer_size) < buffer_size) {
235 /* Be sure to reload new data */
236 r = LUKS_read_phdr(device, hdr, 0, ctx);
244 static int _check_and_convert_hdr(const char *device,
245 struct luks_phdr *hdr,
246 int require_luks_device,
247 struct crypt_device *ctx)
251 char luksMagic[] = LUKS_MAGIC;
253 if(memcmp(hdr->magic, luksMagic, LUKS_MAGIC_L)) { /* Check magic */
254 log_dbg("LUKS header not detected.");
255 if (require_luks_device)
256 log_err(ctx, _("Device %s is not a valid LUKS device.\n"), device);
258 set_error(_("Device %s is not a valid LUKS device."), device);
260 } else if((hdr->version = ntohs(hdr->version)) != 1) { /* Convert every uint16/32_t item from network byte order */
261 log_err(ctx, _("Unsupported LUKS version %d.\n"), hdr->version);
263 } else if (PBKDF2_HMAC_ready(hdr->hashSpec) < 0) {
264 log_err(ctx, _("Requested LUKS hash %s is not supported.\n"), hdr->hashSpec);
267 hdr->payloadOffset = ntohl(hdr->payloadOffset);
268 hdr->keyBytes = ntohl(hdr->keyBytes);
269 hdr->mkDigestIterations = ntohl(hdr->mkDigestIterations);
271 for(i = 0; i < LUKS_NUMKEYS; ++i) {
272 hdr->keyblock[i].active = ntohl(hdr->keyblock[i].active);
273 hdr->keyblock[i].passwordIterations = ntohl(hdr->keyblock[i].passwordIterations);
274 hdr->keyblock[i].keyMaterialOffset = ntohl(hdr->keyblock[i].keyMaterialOffset);
275 hdr->keyblock[i].stripes = ntohl(hdr->keyblock[i].stripes);
282 static void _to_lower(char *str, unsigned max_len)
284 for(; *str && max_len; str++, max_len--)
286 *str = tolower(*str);
289 static void LUKS_fix_header_compatible(struct luks_phdr *header)
291 /* Old cryptsetup expects "sha1", gcrypt allows case insensistive names,
292 * so always convert hash to lower case in header */
293 _to_lower(header->hashSpec, LUKS_HASHSPEC_L);
296 int LUKS_read_phdr_backup(const char *backup_file,
298 struct luks_phdr *hdr,
299 int require_luks_device,
300 struct crypt_device *ctx)
302 int devfd = 0, r = 0;
304 log_dbg("Reading LUKS header of size %d from backup file %s",
305 sizeof(struct luks_phdr), backup_file);
307 devfd = open(backup_file, O_RDONLY);
309 log_err(ctx, _("Cannot open file %s.\n"), device);
313 if(read(devfd, hdr, sizeof(struct luks_phdr)) < sizeof(struct luks_phdr))
316 LUKS_fix_header_compatible(hdr);
317 r = _check_and_convert_hdr(backup_file, hdr, require_luks_device, ctx);
324 int LUKS_read_phdr(const char *device,
325 struct luks_phdr *hdr,
326 int require_luks_device,
327 struct crypt_device *ctx)
329 int devfd = 0, r = 0;
332 log_dbg("Reading LUKS header of size %d from device %s",
333 sizeof(struct luks_phdr), device);
335 devfd = open(device,O_RDONLY | O_DIRECT | O_SYNC);
337 log_err(ctx, _("Cannot open device %s.\n"), device);
341 if(read_blockwise(devfd, hdr, sizeof(struct luks_phdr)) < sizeof(struct luks_phdr))
344 r = _check_and_convert_hdr(device, hdr, require_luks_device, ctx);
347 if (r == 0 && (ioctl(devfd, BLKGETSIZE64, &size) < 0 ||
348 size < (uint64_t)hdr->payloadOffset)) {
349 log_err(ctx, _("LUKS header detected but device %s is too small.\n"), device);
358 int LUKS_write_phdr(const char *device,
359 struct luks_phdr *hdr,
360 struct crypt_device *ctx)
364 struct luks_phdr convHdr;
367 log_dbg("Updating LUKS header of size %d on device %s",
368 sizeof(struct luks_phdr), device);
370 devfd = open(device,O_RDWR | O_DIRECT | O_SYNC);
372 log_err(ctx, _("Cannot open device %s.\n"), device);
376 memcpy(&convHdr, hdr, sizeof(struct luks_phdr));
377 memset(&convHdr._padding, 0, sizeof(convHdr._padding));
379 /* Convert every uint16/32_t item to network byte order */
380 convHdr.version = htons(hdr->version);
381 convHdr.payloadOffset = htonl(hdr->payloadOffset);
382 convHdr.keyBytes = htonl(hdr->keyBytes);
383 convHdr.mkDigestIterations = htonl(hdr->mkDigestIterations);
384 for(i = 0; i < LUKS_NUMKEYS; ++i) {
385 convHdr.keyblock[i].active = htonl(hdr->keyblock[i].active);
386 convHdr.keyblock[i].passwordIterations = htonl(hdr->keyblock[i].passwordIterations);
387 convHdr.keyblock[i].keyMaterialOffset = htonl(hdr->keyblock[i].keyMaterialOffset);
388 convHdr.keyblock[i].stripes = htonl(hdr->keyblock[i].stripes);
391 r = write_blockwise(devfd, &convHdr, sizeof(struct luks_phdr)) < sizeof(struct luks_phdr) ? -EIO : 0;
393 log_err(ctx, _("Error during update of LUKS header on device %s.\n"), device);
396 /* Re-read header from disk to be sure that in-memory and on-disk data are the same. */
398 r = LUKS_read_phdr(device, hdr, 1, ctx);
400 log_err(ctx, _("Error re-reading LUKS header after update on device %s.\n"), device);
406 static int LUKS_PBKDF2_performance_check(const char *hashSpec,
407 uint64_t *PBKDF2_per_sec,
408 struct crypt_device *ctx)
410 if (!*PBKDF2_per_sec) {
411 if (PBKDF2_performance_check(hashSpec, PBKDF2_per_sec) < 0) {
412 log_err(ctx, _("Not compatible PBKDF2 options (using hash algorithm %s).\n"), hashSpec);
415 log_dbg("PBKDF2: %" PRIu64 " iterations per second using hash %s.", *PBKDF2_per_sec, hashSpec);
421 int LUKS_generate_phdr(struct luks_phdr *header,
422 const struct luks_masterkey *mk,
423 const char *cipherName, const char *cipherMode, const char *hashSpec,
424 const char *uuid, unsigned int stripes,
425 unsigned int alignPayload,
426 unsigned int alignOffset,
427 uint32_t iteration_time_ms,
428 uint64_t *PBKDF2_per_sec,
429 struct crypt_device *ctx)
432 unsigned int blocksPerStripeSet = div_round_up(mk->keyLength*stripes,SECTOR_SIZE);
435 char luksMagic[] = LUKS_MAGIC;
436 uuid_t partitionUuid;
438 int alignSectors = LUKS_ALIGN_KEYSLOTS / SECTOR_SIZE;
439 if (alignPayload == 0)
440 alignPayload = alignSectors;
442 memset(header,0,sizeof(struct luks_phdr));
445 memcpy(header->magic,luksMagic,LUKS_MAGIC_L);
447 strncpy(header->cipherName,cipherName,LUKS_CIPHERNAME_L);
448 strncpy(header->cipherMode,cipherMode,LUKS_CIPHERMODE_L);
449 strncpy(header->hashSpec,hashSpec,LUKS_HASHSPEC_L);
451 header->keyBytes=mk->keyLength;
453 LUKS_fix_header_compatible(header);
455 log_dbg("Generating LUKS header version %d using hash %s, %s, %s, MK %d bytes",
456 header->version, header->hashSpec ,header->cipherName, header->cipherMode,
459 r = getRandom(header->mkDigestSalt,LUKS_SALTSIZE);
461 log_err(ctx, _("Cannot create LUKS header: reading random salt failed.\n"));
465 if ((r = LUKS_PBKDF2_performance_check(header->hashSpec, PBKDF2_per_sec, ctx)))
468 /* Compute master key digest */
469 iteration_time_ms /= 8;
470 header->mkDigestIterations = at_least((uint32_t)(*PBKDF2_per_sec/1024) * iteration_time_ms,
471 LUKS_MKD_ITERATIONS_MIN);
473 r = PBKDF2_HMAC(header->hashSpec,mk->key,mk->keyLength,
474 header->mkDigestSalt,LUKS_SALTSIZE,
475 header->mkDigestIterations,
476 header->mkDigest,LUKS_DIGESTSIZE);
478 log_err(ctx, _("Cannot create LUKS header: header digest failed (using hash %s).\n"),
483 currentSector = round_up_modulo(LUKS_PHDR_SIZE, alignSectors);
484 for(i = 0; i < LUKS_NUMKEYS; ++i) {
485 header->keyblock[i].active = LUKS_KEY_DISABLED;
486 header->keyblock[i].keyMaterialOffset = currentSector;
487 header->keyblock[i].stripes = stripes;
488 currentSector = round_up_modulo(currentSector + blocksPerStripeSet, alignSectors);
490 currentSector = round_up_modulo(currentSector, alignPayload);
492 /* alignOffset - offset from natural device alignment provided by topology info */
493 header->payloadOffset = currentSector + alignOffset;
495 uuid_from_string(uuid, &partitionUuid, &ret);
496 if (uuid && ret != uuid_s_ok) {
497 log_err(ctx, _("Wrong UUID format provided, generating new one.\n"));
501 uuid_create(&partitionUuid, &ret);
502 uuid_to_string(&partitionUuid, &header->uuid, &ret);
504 log_dbg("Data offset %d, UUID %s, digest iterations %" PRIu32,
505 header->payloadOffset, header->uuid, header->mkDigestIterations);
510 int LUKS_set_key(const char *device, unsigned int keyIndex,
511 const char *password, size_t passwordLen,
512 struct luks_phdr *hdr, struct luks_masterkey *mk,
513 uint32_t iteration_time_ms,
514 uint64_t *PBKDF2_per_sec,
515 struct crypt_device *ctx)
517 char derivedKey[hdr->keyBytes];
519 unsigned int AFEKSize;
520 uint64_t PBKDF2_temp;
523 if(hdr->keyblock[keyIndex].active != LUKS_KEY_DISABLED) {
524 log_err(ctx, _("Key slot %d active, purge first.\n"), keyIndex);
528 if(hdr->keyblock[keyIndex].stripes < LUKS_STRIPES) {
529 log_err(ctx, _("Key slot %d material includes too few stripes. Header manipulation?\n"),
534 log_dbg("Calculating data for key slot %d", keyIndex);
536 if ((r = LUKS_PBKDF2_performance_check(hdr->hashSpec, PBKDF2_per_sec, ctx)))
540 * Avoid floating point operation
541 * Final iteration count is at least LUKS_SLOT_ITERATIONS_MIN
543 PBKDF2_temp = (*PBKDF2_per_sec / 2) * (uint64_t)iteration_time_ms;
545 if (PBKDF2_temp > UINT32_MAX)
546 PBKDF2_temp = UINT32_MAX;
547 hdr->keyblock[keyIndex].passwordIterations = at_least((uint32_t)PBKDF2_temp,
548 LUKS_SLOT_ITERATIONS_MIN);
550 log_dbg("Key slot %d use %d password iterations.", keyIndex, hdr->keyblock[keyIndex].passwordIterations);
552 r = getRandom(hdr->keyblock[keyIndex].passwordSalt, LUKS_SALTSIZE);
555 // assert((mk->keyLength % TWOFISH_BLOCKSIZE) == 0); FIXME
557 r = PBKDF2_HMAC(hdr->hashSpec, password,passwordLen,
558 hdr->keyblock[keyIndex].passwordSalt,LUKS_SALTSIZE,
559 hdr->keyblock[keyIndex].passwordIterations,
560 derivedKey, hdr->keyBytes);
564 * AF splitting, the masterkey stored in mk->key is splitted to AfMK
566 AFEKSize = hdr->keyblock[keyIndex].stripes*mk->keyLength;
567 AfKey = (char *)malloc(AFEKSize);
568 if(AfKey == NULL) return -ENOMEM;
570 log_dbg("Using hash %s for AF in key slot %d, %d stripes",
571 hdr->hashSpec, keyIndex, hdr->keyblock[keyIndex].stripes);
572 r = AF_split(mk->key,AfKey,mk->keyLength,hdr->keyblock[keyIndex].stripes,hdr->hashSpec);
575 log_dbg("Updating key slot %d [0x%04x] area on device %s.", keyIndex,
576 hdr->keyblock[keyIndex].keyMaterialOffset << 9, device);
577 /* Encryption via dm */
578 r = LUKS_encrypt_to_storage(AfKey,
584 hdr->keyblock[keyIndex].keyMaterialOffset,
588 log_err(ctx, _("Failed to write to key storage.\n"));
592 /* Mark the key as active in phdr */
593 r = LUKS_keyslot_set(hdr, (int)keyIndex, 1);
596 r = LUKS_write_phdr(device, hdr, ctx);
605 /* Check whether a master key is invalid. */
606 int LUKS_verify_master_key(const struct luks_phdr *hdr,
607 const struct luks_masterkey *mk)
609 char checkHashBuf[LUKS_DIGESTSIZE];
611 if (PBKDF2_HMAC(hdr->hashSpec, mk->key, mk->keyLength,
612 hdr->mkDigestSalt, LUKS_SALTSIZE,
613 hdr->mkDigestIterations, checkHashBuf,
614 LUKS_DIGESTSIZE) < 0)
617 if (memcmp(checkHashBuf, hdr->mkDigest, LUKS_DIGESTSIZE))
623 /* Try to open a particular key slot */
624 static int LUKS_open_key(const char *device,
625 unsigned int keyIndex,
626 const char *password,
628 struct luks_phdr *hdr,
629 struct luks_masterkey *mk,
630 struct crypt_device *ctx)
632 crypt_keyslot_info ki = LUKS_keyslot_info(hdr, keyIndex);
633 char derivedKey[hdr->keyBytes];
638 log_dbg("Trying to open key slot %d [%d].", keyIndex, (int)ki);
640 if (ki < CRYPT_SLOT_ACTIVE)
643 // assert((mk->keyLength % TWOFISH_BLOCKSIZE) == 0); FIXME
645 AFEKSize = hdr->keyblock[keyIndex].stripes*mk->keyLength;
646 AfKey = (char *)malloc(AFEKSize);
647 if(AfKey == NULL) return -ENOMEM;
649 r = PBKDF2_HMAC(hdr->hashSpec, password,passwordLen,
650 hdr->keyblock[keyIndex].passwordSalt,LUKS_SALTSIZE,
651 hdr->keyblock[keyIndex].passwordIterations,
652 derivedKey, hdr->keyBytes);
655 log_dbg("Reading key slot %d area.", keyIndex);
656 r = LUKS_decrypt_from_storage(AfKey,
662 hdr->keyblock[keyIndex].keyMaterialOffset,
665 log_err(ctx, _("Failed to read from key storage.\n"));
669 r = AF_merge(AfKey,mk->key,mk->keyLength,hdr->keyblock[keyIndex].stripes,hdr->hashSpec);
672 r = LUKS_verify_master_key(hdr, mk);
674 log_verbose(ctx, _("Key slot %d unlocked.\n"), keyIndex);
680 int LUKS_open_key_with_hdr(const char *device,
682 const char *password,
684 struct luks_phdr *hdr,
685 struct luks_masterkey **mk,
686 struct crypt_device *ctx)
691 *mk = LUKS_alloc_masterkey(hdr->keyBytes, NULL);
694 return LUKS_open_key(device, keyIndex, password, passwordLen, hdr, *mk, ctx);
696 for(i = 0; i < LUKS_NUMKEYS; i++) {
697 r = LUKS_open_key(device, i, password, passwordLen, hdr, *mk, ctx);
701 /* Do not retry for errors that are no -EPERM or -ENOENT,
702 former meaning password wrong, latter key slot inactive */
703 if ((r != -EPERM) && (r != -ENOENT))
706 /* Warning, early returns above */
707 log_err(ctx, _("No key available with this passphrase.\n"));
712 * Wipe patterns according to Gutmann's Paper
715 static void wipeSpecial(char *buffer, size_t buffer_size, unsigned int turn)
719 unsigned char write_modes[][3] = {
720 {"\x55\x55\x55"}, {"\xaa\xaa\xaa"}, {"\x92\x49\x24"},
721 {"\x49\x24\x92"}, {"\x24\x92\x49"}, {"\x00\x00\x00"},
722 {"\x11\x11\x11"}, {"\x22\x22\x22"}, {"\x33\x33\x33"},
723 {"\x44\x44\x44"}, {"\x55\x55\x55"}, {"\x66\x66\x66"},
724 {"\x77\x77\x77"}, {"\x88\x88\x88"}, {"\x99\x99\x99"},
725 {"\xaa\xaa\xaa"}, {"\xbb\xbb\xbb"}, {"\xcc\xcc\xcc"},
726 {"\xdd\xdd\xdd"}, {"\xee\xee\xee"}, {"\xff\xff\xff"},
727 {"\x92\x49\x24"}, {"\x49\x24\x92"}, {"\x24\x92\x49"},
728 {"\x6d\xb6\xdb"}, {"\xb6\xdb\x6d"}, {"\xdb\x6d\xb6"}
731 for(i = 0; i < buffer_size / 3; ++i) {
732 memcpy(buffer, write_modes[turn], 3);
737 static int wipe(const char *device, unsigned int from, unsigned int to)
742 unsigned int bufLen = (to - from) * SECTOR_SIZE;
745 devfd = open(device, O_RDWR | O_DIRECT | O_SYNC);
749 buffer = (char *) malloc(bufLen);
750 if(!buffer) return -ENOMEM;
752 for(i = 0; i < 39; ++i) {
753 if (i >= 0 && i < 5) getRandom(buffer, bufLen);
754 else if(i >= 5 && i < 32) wipeSpecial(buffer, bufLen, i - 5);
755 else if(i >= 32 && i < 38) getRandom(buffer, bufLen);
756 else if(i >= 38 && i < 39) memset(buffer, 0xFF, bufLen);
758 if(write_lseek_blockwise(devfd, buffer, bufLen, from * SECTOR_SIZE) < 0) {
770 int LUKS_del_key(const char *device,
771 unsigned int keyIndex,
772 struct luks_phdr *hdr,
773 struct crypt_device *ctx)
775 unsigned int startOffset, endOffset, stripesLen;
778 r = LUKS_read_phdr(device, hdr, 1, ctx);
782 r = LUKS_keyslot_set(hdr, keyIndex, 0);
784 log_err(ctx, _("Key slot %d is invalid, please select keyslot between 0 and %d.\n"),
785 keyIndex, LUKS_NUMKEYS - 1);
789 /* secure deletion of key material */
790 startOffset = hdr->keyblock[keyIndex].keyMaterialOffset;
791 stripesLen = hdr->keyBytes * hdr->keyblock[keyIndex].stripes;
792 endOffset = startOffset + div_round_up(stripesLen, SECTOR_SIZE);
794 r = wipe(device, startOffset, endOffset);
796 log_err(ctx, _("Cannot wipe device %s.\n"), device);
800 r = LUKS_write_phdr(device, hdr, ctx);
805 crypt_keyslot_info LUKS_keyslot_info(struct luks_phdr *hdr, int keyslot)
809 if(keyslot >= LUKS_NUMKEYS || keyslot < 0)
810 return CRYPT_SLOT_INVALID;
812 if (hdr->keyblock[keyslot].active == LUKS_KEY_DISABLED)
813 return CRYPT_SLOT_INACTIVE;
815 if (hdr->keyblock[keyslot].active != LUKS_KEY_ENABLED)
816 return CRYPT_SLOT_INVALID;
818 for(i = 0; i < LUKS_NUMKEYS; i++)
819 if(i != keyslot && hdr->keyblock[i].active == LUKS_KEY_ENABLED)
820 return CRYPT_SLOT_ACTIVE;
822 return CRYPT_SLOT_ACTIVE_LAST;
825 int LUKS_keyslot_find_empty(struct luks_phdr *hdr)
829 for (i = 0; i < LUKS_NUMKEYS; i++)
830 if(hdr->keyblock[i].active == LUKS_KEY_DISABLED)
833 if (i == LUKS_NUMKEYS)
839 int LUKS_keyslot_active_count(struct luks_phdr *hdr)
843 for (i = 0; i < LUKS_NUMKEYS; i++)
844 if(hdr->keyblock[i].active == LUKS_KEY_ENABLED)
850 int LUKS_keyslot_set(struct luks_phdr *hdr, int keyslot, int enable)
852 crypt_keyslot_info ki = LUKS_keyslot_info(hdr, keyslot);
854 if (ki == CRYPT_SLOT_INVALID)
857 hdr->keyblock[keyslot].active = enable ? LUKS_KEY_ENABLED : LUKS_KEY_DISABLED;
858 log_dbg("Key slot %d was %s in LUKS header.", keyslot, enable ? "enabled" : "disabled");