1 files changed, 83 insertions, 0 deletions
diff --git a/extras/volume_id/libvolume_id/luks.c b/extras/volume_id/libvolume_id/luks.c
new file mode 100644
index 0000000000..43f326e176
--- /dev/null
+++ b/extras/volume_id/libvolume_id/luks.c
@@ -0,0 +1,83 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2005 W. Michael Petullo <mike@flyn.org>
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation version 2 of the License.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "volume_id.h"
+#include "util.h"
+#include "logging.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
+
+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 = (struct luks_phdr*) 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;
+}