2 * volume_id - reads filesystem label and uuid
4 * Copyright (C) 2005 W. Michael Petullo <mike@flyn.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
26 #include "volume_id.h"
31 #define SECTOR_SHIFT 9
32 #define SECTOR_SIZE (1 << SECTOR_SHIFT)
34 #define LUKS_CIPHERNAME_L 32
35 #define LUKS_CIPHERMODE_L 32
36 #define LUKS_HASHSPEC_L 32
37 #define LUKS_DIGESTSIZE 20
38 #define LUKS_SALTSIZE 32
39 #define LUKS_NUMKEYS 8
41 const uint8_t LUKS_MAGIC[] = {'L','U','K','S', 0xba, 0xbe};
42 #define LUKS_MAGIC_L 6
43 #define LUKS_PHDR_SIZE (sizeof(struct luks_phdr)/SECTOR_SIZE+1)
44 #define UUID_STRING_L 40
47 uint8_t magic[LUKS_MAGIC_L];
49 uint8_t cipherName[LUKS_CIPHERNAME_L];
50 uint8_t cipherMode[LUKS_CIPHERMODE_L];
51 uint8_t hashSpec[LUKS_HASHSPEC_L];
52 uint32_t payloadOffset;
54 uint8_t mkDigest[LUKS_DIGESTSIZE];
55 uint8_t mkDigestSalt[LUKS_SALTSIZE];
56 uint32_t mkDigestIterations;
57 uint8_t uuid[UUID_STRING_L];
60 uint32_t passwordIterations;
61 uint8_t passwordSalt[LUKS_SALTSIZE];
62 uint32_t keyMaterialOffset;
64 } keyblock[LUKS_NUMKEYS];
67 int volume_id_probe_luks(struct volume_id *id, uint64_t off)
69 struct luks_phdr *header;
71 header = (struct luks_phdr*) volume_id_get_buffer(id, off, LUKS_PHDR_SIZE);
75 if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L))
78 volume_id_set_usage(id, VOLUME_ID_CRYPTO);
79 volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING);
81 id->type = "crypto_LUKS";