2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2005 W. Michael Petullo <mike@flyn.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
36 #include "volume_id.h"
41 #define SECTOR_SHIFT 9
42 #define SECTOR_SIZE (1 << SECTOR_SHIFT)
44 #define LUKS_CIPHERNAME_L 32
45 #define LUKS_CIPHERMODE_L 32
46 #define LUKS_HASHSPEC_L 32
47 #define LUKS_DIGESTSIZE 20
48 #define LUKS_SALTSIZE 32
49 #define LUKS_NUMKEYS 8
51 const uint8_t LUKS_MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
52 #define LUKS_MAGIC_L 6
53 #define LUKS_PHDR_SIZE (sizeof(struct luks_phdr)/SECTOR_SIZE+1)
54 #define UUID_STRING_L 40
57 uint8_t magic[LUKS_MAGIC_L];
59 uint8_t cipherName[LUKS_CIPHERNAME_L];
60 uint8_t cipherMode[LUKS_CIPHERMODE_L];
61 uint8_t hashSpec[LUKS_HASHSPEC_L];
62 uint32_t payloadOffset;
64 uint8_t mkDigest[LUKS_DIGESTSIZE];
65 uint8_t mkDigestSalt[LUKS_SALTSIZE];
66 uint32_t mkDigestIterations;
67 uint8_t uuid[UUID_STRING_L];
70 uint32_t passwordIterations;
71 uint8_t passwordSalt[LUKS_SALTSIZE];
72 uint32_t keyMaterialOffset;
74 } keyblock[LUKS_NUMKEYS];
77 int volume_id_probe_luks(struct volume_id *id, uint64_t off)
79 struct luks_phdr *header;
81 header = (struct luks_phdr*) volume_id_get_buffer(id, off, LUKS_PHDR_SIZE);
85 if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L))
88 volume_id_set_usage(id, VOLUME_ID_CRYPTO);
89 volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING);
91 id->type = "crypto_LUKS";