1 files changed, 76 insertions, 0 deletions
diff --git a/util-linux/volume_id/luks.c b/util-linux/volume_id/luks.c
new file mode 100644
index 000000000..e73ce3a03
--- /dev/null
+++ b/util-linux/volume_id/luks.c
@@ -0,0 +1,76 @@
+/*
+ * 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;
+}