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diff --git a/Command/TransferKey.hs b/Command/TransferKey.hs
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+++ b/Command/TransferKey.hs
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+{- git-annex command, used internally by assistant
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Command.TransferKey where
+
+import Common.Annex
+import Command
+import Annex.Content
+import Logs.Location
+import Logs.Transfer
+import qualified Remote
+import Types.Remote
+import qualified Command.Move
+import qualified Option
+
+def :: [Command]
+def = [withOptions options $
+	oneShot $ command "transferkey" paramKey seek
+		"transfers a key from or to a remote"]
+
+options :: [Option]
+options = fileOption : Command.Move.options
+
+fileOption :: Option
+fileOption = Option.field [] "file" paramFile "the associated file"
+
+seek :: [CommandSeek]
+seek = [withField Command.Move.toOption Remote.byName $ \to ->
+	withField Command.Move.fromOption Remote.byName $ \from ->
+	withField fileOption return $ \file ->
+		withKeys $ start to from file]
+
+start :: Maybe Remote -> Maybe Remote -> AssociatedFile -> Key -> CommandStart
+start to from file key =
+	case (from, to) of
+		(Nothing, Just dest) -> next $ toPerform dest key file
+		(Just src, Nothing) -> next $ fromPerform src key file
+		_ -> error "specify either --from or --to"
+
+toPerform :: Remote -> Key -> AssociatedFile -> CommandPerform
+toPerform remote key file = next $
+	upload (uuid remote) key file $ do
+		ok <- Remote.storeKey remote key file
+		when ok $
+			Remote.logStatus remote key InfoPresent
+		return ok
+
+fromPerform :: Remote -> Key -> AssociatedFile -> CommandPerform
+fromPerform remote key file = next $
+	download (uuid remote) key file $
+		getViaTmp key $ Remote.retrieveKeyFile remote key file