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bigbiff bigbiffe60683a2013-02-22 20:55:50 -05001/*
2 * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
3 *
4 * Inspired by libvolume_id by
5 * Kay Sievers <kay.sievers@vrfy.org>
6 *
7 * This file may be redistributed under the terms of the
8 * GNU Lesser General Public License.
9 */
10#include <stdio.h>
11#include <stdlib.h>
12#include <unistd.h>
13#include <string.h>
14#include <errno.h>
15#include <ctype.h>
16#include <stdint.h>
17
18#include "superblocks.h"
19
20#define LUKS_CIPHERNAME_L 32
21#define LUKS_CIPHERMODE_L 32
22#define LUKS_HASHSPEC_L 32
23#define LUKS_DIGESTSIZE 20
24#define LUKS_SALTSIZE 32
25#define LUKS_MAGIC_L 6
26#define UUID_STRING_L 40
27
28struct luks_phdr {
29 uint8_t magic[LUKS_MAGIC_L];
30 uint16_t version;
31 uint8_t cipherName[LUKS_CIPHERNAME_L];
32 uint8_t cipherMode[LUKS_CIPHERMODE_L];
33 uint8_t hashSpec[LUKS_HASHSPEC_L];
34 uint32_t payloadOffset;
35 uint32_t keyBytes;
36 uint8_t mkDigest[LUKS_DIGESTSIZE];
37 uint8_t mkDigestSalt[LUKS_SALTSIZE];
38 uint32_t mkDigestIterations;
39 uint8_t uuid[UUID_STRING_L];
40} __attribute__((packed));
41
42static int probe_luks(blkid_probe pr, const struct blkid_idmag *mag)
43{
44 struct luks_phdr *header;
45
46 header = blkid_probe_get_sb(pr, mag, struct luks_phdr);
47 if (header == NULL)
48 return -1;
49
50 blkid_probe_strncpy_uuid(pr, (unsigned char *) header->uuid,
51 sizeof(header->uuid));
52 blkid_probe_sprintf_version(pr, "%u", be16_to_cpu(header->version));
53 return 0;
54}
55
56const struct blkid_idinfo luks_idinfo =
57{
58 .name = "crypto_LUKS",
59 .usage = BLKID_USAGE_CRYPTO,
60 .probefunc = probe_luks,
61 .magics =
62 {
63 { .magic = "LUKS\xba\xbe", .len = 6 },
64 { NULL }
65 }
66};