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/*
* volume_id - reads filesystem label and uuid
*
* Copyright (C) 2005 W. Michael Petullo <mike@flyn.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "volume_id_internal.h"
#define SECTOR_SHIFT 9
#define SECTOR_SIZE (1 << SECTOR_SHIFT)
#define LUKS_CIPHERNAME_L 32
#define LUKS_CIPHERMODE_L 32
#define LUKS_HASHSPEC_L 32
#define LUKS_DIGESTSIZE 20
#define LUKS_SALTSIZE 32
#define LUKS_NUMKEYS 8
static const uint8_t LUKS_MAGIC[] = { 'L','U','K','S', 0xba, 0xbe };
#define LUKS_MAGIC_L 6
#define LUKS_PHDR_SIZE (sizeof(struct luks_phdr)/SECTOR_SIZE+1)
#define UUID_STRING_L 40
struct luks_phdr {
uint8_t magic[LUKS_MAGIC_L];
uint16_t version;
uint8_t cipherName[LUKS_CIPHERNAME_L];
uint8_t cipherMode[LUKS_CIPHERMODE_L];
uint8_t hashSpec[LUKS_HASHSPEC_L];
uint32_t payloadOffset;
uint32_t keyBytes;
uint8_t mkDigest[LUKS_DIGESTSIZE];
uint8_t mkDigestSalt[LUKS_SALTSIZE];
uint32_t mkDigestIterations;
uint8_t uuid[UUID_STRING_L];
struct {
uint32_t active;
uint32_t passwordIterations;
uint8_t passwordSalt[LUKS_SALTSIZE];
uint32_t keyMaterialOffset;
uint32_t stripes;
} keyblock[LUKS_NUMKEYS];
};
int volume_id_probe_luks(struct volume_id *id, uint64_t off)
{
struct luks_phdr *header;
header = volume_id_get_buffer(id, off, LUKS_PHDR_SIZE);
if (header == NULL)
return -1;
if (memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L))
return -1;
volume_id_set_usage(id, VOLUME_ID_CRYPTO);
volume_id_set_uuid(id, header->uuid, UUID_DCE_STRING);
id->type = "crypto_LUKS";
return 0;
}
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