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Diffstat (limited to 'util-linux/volume_id/luks.c')
-rw-r--r--util-linux/volume_id/luks.c76
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;
+}