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-rw-r--r--Documentation/device-mapper/dm-crypt.txt7
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/device-mapper/dm-crypt.txt b/Documentation/device-mapper/dm-crypt.txt
index ddeb749c5503..6b5c42dbbe84 100644
--- a/Documentation/device-mapper/dm-crypt.txt
+++ b/Documentation/device-mapper/dm-crypt.txt
@@ -8,7 +8,7 @@ Parameters: <cipher> <key> <iv_offset> <device path> <offset>
<cipher>
Encryption cipher and an optional IV generation mode.
- (In format cipher-chainmode-ivopts:ivmode).
+ (In format cipher[:keycount]-chainmode-ivopts:ivmode).
Examples:
des
aes-cbc-essiv:sha256
@@ -20,6 +20,11 @@ Parameters: <cipher> <key> <iv_offset> <device path> <offset>
Key used for encryption. It is encoded as a hexadecimal number.
You can only use key sizes that are valid for the selected cipher.
+<keycount>
+ Multi-key compatibility mode. You can define <keycount> keys and
+ then sectors are encrypted according to their offsets (sector 0 uses key0;
+ sector 1 uses key1 etc.). <keycount> must be a power of two.
+
<iv_offset>
The IV offset is a sector count that is added to the sector number
before creating the IV.