diff --git a/COPYING b/COPYING
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+++ b/COPYING
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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/hjugement-cli.cabal b/hjugement-cli.cabal
new file mode 100644
--- /dev/null
+++ b/hjugement-cli.cabal
@@ -0,0 +1,98 @@
+name: hjugement-cli
+-- PVP:  +-+------- breaking API changes
+--       | | +----- non-breaking API additions
+--       | | | +--- code changes with no API change
+version: 0.0.0.20190621
+category: Politic
+synopsis: 
+description: Majority Judgment command line tool
+extra-doc-files: 
+license: GPL-3
+license-file: COPYING
+stability: experimental
+author:      Julien Moutinho <julm+hjugement@autogeree.net>
+maintainer:  Julien Moutinho <julm+hjugement@autogeree.net>
+bug-reports: Julien Moutinho <julm+hjugement@autogeree.net>
+-- homepage:
+
+build-type: Simple
+cabal-version: 1.24
+tested-with: GHC==8.6.4
+extra-source-files:
+  stack.yaml
+extra-tmp-files:
+
+Source-Repository head
+ location: git://git.autogeree.net/hjugement
+ type:     git
+
+Executable hjugement-cli
+  hs-source-dirs: src
+  main-is: Main.hs
+  other-modules:
+    Hjugement.CLI
+    Hjugement.CLI.MkElection
+    Hjugement.CLI.Registrar
+    Hjugement.CLI.Trustee
+    Hjugement.CLI.Utils
+    Paths_hjugement_cli
+  default-language: Haskell2010
+  default-extensions:
+    AllowAmbiguousTypes
+    ConstraintKinds
+    DefaultSignatures
+    FlexibleContexts
+    FlexibleInstances
+    GeneralizedNewtypeDeriving
+    LambdaCase
+    MonoLocalBinds
+    MultiParamTypeClasses
+    NamedFieldPuns
+    NoImplicitPrelude
+    NoMonomorphismRestriction
+    RecordWildCards
+    ScopedTypeVariables
+    StandaloneDeriving
+    TupleSections
+    TypeApplications
+    TypeFamilies
+    TypeOperators
+  ghc-options:
+    -Wall
+    -Wincomplete-uni-patterns
+    -Wincomplete-record-updates
+    -fno-warn-tabs
+    -- -fhide-source-paths
+  build-depends:
+      hjugement >= 2.0
+    , hjugement-protocol >= 0.0.1
+    , aeson >= 1.3
+    , base >= 4.6 && < 5
+    , base64-bytestring >= 1.0
+    , binary >= 0.8
+    , bytestring >= 0.10
+    , containers >= 0.5
+    , cryptonite >= 0.25
+    , deepseq >= 1.4
+    , directory >= 1.3
+    , filepath >= 1.4
+    , ghc-prim >= 0.5
+    , lens-family-core >= 1.2
+    , memory >= 0.14
+    , pipes >= 4.3
+    , pipes-aeson >= 0.4
+    , pipes-bytestring >= 2.1
+    , pipes-group >= 1.0
+    , pipes-parse >= 3.0
+    , pipes-safe >= 2.3
+    , pipes-text >= 0.0.2.5
+    , random >= 1.1
+    , reflection >= 2.1
+    , symantic-cli >= 2.3.2
+    , symantic-document >= 1.5
+    , terminal-size >= 0.3
+    , text >= 1.2
+    , time >= 1.8
+    , transformers >= 0.5
+    , unix >= 2.7
+    , unordered-containers >= 0.2.8
diff --git a/src/Hjugement/CLI.hs b/src/Hjugement/CLI.hs
new file mode 100644
--- /dev/null
+++ b/src/Hjugement/CLI.hs
@@ -0,0 +1,78 @@
+{-# LANGUAGE AllowAmbiguousTypes #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE NoMonomorphismRestriction #-}
+{-# LANGUAGE TypeApplications #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE UndecidableInstances #-}
+{-# OPTIONS_GHC -Wno-missing-signatures #-}
+{-# OPTIONS_GHC -Wno-unused-imports #-}
+module Hjugement.CLI where
+
+import Control.Applicative (Applicative(..), Alternative(..))
+import Control.Monad (Monad(..))
+import Data.Bool
+import Data.Either (Either(..))
+import Data.Function (($), (.))
+import Data.Functor ((<$>), (<$))
+import Data.Int (Int)
+import Data.List.NonEmpty (NonEmpty(..))
+import Data.Maybe (Maybe(..), fromMaybe)
+import Data.Ord (Ord(..))
+import Data.Semigroup (Semigroup(..))
+import Data.String (String)
+import Data.Text (Text)
+import Data.Void (Void)
+import Symantic.CLI as CLI
+import System.Environment (getArgs)
+import System.IO (IO, FilePath, print, stderr, putStrLn)
+import Text.Show (Show(..))
+import Type.Reflection (Typeable)
+import qualified Data.Set as Set
+import qualified Data.Text as Text
+import qualified Data.Text.Lazy.IO as TL
+import qualified Data.Version as Version
+import qualified Paths_hjugement_cli as Hjugement
+import qualified Symantic.Document as Doc
+import qualified System.IO as IO
+
+import Hjugement.CLI.Utils
+import Hjugement.CLI.Registrar
+import Hjugement.CLI.Trustee
+import Hjugement.CLI.MkElection
+
+progname :: Text
+progname = "hjugement"
+version :: Text
+version =
+	progname <> "-" <>
+	Text.pack (Version.showVersion Hjugement.version)
+
+api =
+	program "hjugement" $
+		(api_options <?> api_command) <!>
+		api_help True <!>
+		api_version
+
+api_command =
+	rule "COMMAND" $
+		api_registrar <!>
+		api_trustee <!>
+		api_mkelection
+run_command opts =
+	run_registrar opts :!:
+	run_trustee opts :!:
+	(run_mkelection :!: run_help api_mkelection)
+
+api_version =
+	"Print the version."
+	`helps`
+	tagged (TagLong "version") nothing
+	<.> response @Doc
+
+parseAPI = parser @Void @Doc api $
+	run_command :!:
+	run_help api :!:
+	run_version
+	where
+	run_version =
+		return (Doc.from version <> Doc.newline)
diff --git a/src/Hjugement/CLI/MkElection.hs b/src/Hjugement/CLI/MkElection.hs
new file mode 100644
--- /dev/null
+++ b/src/Hjugement/CLI/MkElection.hs
@@ -0,0 +1,45 @@
+{-# LANGUAGE NoMonomorphismRestriction #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE StrictData #-}
+{-# OPTIONS_GHC -Wno-missing-signatures #-}
+module Hjugement.CLI.MkElection where
+
+import Control.Applicative (Applicative(..))
+import Control.Monad (Monad(..))
+import Data.Bool
+import Data.Maybe (Maybe(..))
+import Data.Function (($))
+import Data.Functor ((<$>))
+import Data.Semigroup (Semigroup(..))
+import Data.String (String)
+import Symantic.CLI as CLI
+import System.IO (FilePath)
+import Text.Show (Show)
+import qualified Symantic.Document as Doc
+import qualified Voting.Protocol as VP
+
+import Hjugement.CLI.Utils
+
+data MkElection_Options = MkElection_Options
+ {   mkelection_crypto   :: VP.FFC
+ ,   mkelection_template :: FilePath
+ ,   mkelection_uuid     :: VP.UUID
+ } deriving (Show)
+
+api_mkelection =
+	"This command reads and checks "<>fileRef"public_keys.jsons"<>"\
+ \ (or "<>fileRef"threshold.json"<>" if it exists).\
+ \ It then computes the global election public key\
+ \ and generates an "<>fileRef"election.json"<>" file."
+	`helps`
+	command "mkelection" $
+		rule "OPTIONS"
+		 (MkElection_Options
+			 <$> option_crypto
+			 <*> option_template
+			 <*> option_uuid)
+		<?> response @Doc
+		<!> api_help False
+
+run_mkelection MkElection_Options{..} =
+	return ""
diff --git a/src/Hjugement/CLI/Registrar.hs b/src/Hjugement/CLI/Registrar.hs
new file mode 100644
--- /dev/null
+++ b/src/Hjugement/CLI/Registrar.hs
@@ -0,0 +1,190 @@
+{-# LANGUAGE NoMonomorphismRestriction #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE StrictData #-}
+{-# OPTIONS_GHC -Wno-missing-signatures #-}
+module Hjugement.CLI.Registrar where
+
+import Control.Applicative (Applicative(..))
+import Control.Monad (Monad(..), forM, forM_, join, void)
+import Control.Monad.Trans.Class (MonadTrans(..))
+import Control.Monad.Trans.State.Strict (runState, runStateT)
+import Data.Bool
+import Data.ByteString (ByteString)
+import Data.Either (Either(..))
+import Data.Foldable (Foldable, foldMap, length)
+import Data.Function (($), (.), flip)
+import Data.Functor ((<$>))
+import Data.Int (Int)
+import Data.Maybe (Maybe(..), maybe, fromMaybe)
+import Data.Ord (Ord(..))
+import Data.Proxy (Proxy(..))
+import Data.Semigroup (Semigroup(..))
+import Data.String (String)
+import Data.Text (Text)
+import GHC.Natural (minusNatural, minusNaturalMaybe)
+import Numeric.Natural (Natural)
+import Pipes ((>->))
+import Prelude (logBase, ceiling, Num(..), (/), (^), fromIntegral, Double)
+import Symantic.CLI as CLI
+import Text.Show (Show(..))
+import qualified Data.ByteString as BS
+import qualified Data.ByteString.Char8 as BS8
+import qualified Data.ByteString.Lazy as BSL
+import qualified Data.List as List
+import qualified Data.Text as T
+import qualified Data.Text.Encoding as T
+import qualified Data.Text.Lazy as TL
+import qualified Data.Text.Lazy.Encoding as TL
+import qualified Data.Text.Lazy.IO as TL
+import qualified Data.Time as Time
+import qualified Lens.Family as Lens
+import qualified Lens.Family.State.Strict as Lens
+import qualified Pipes as Pip
+import qualified Pipes.ByteString as PipBS
+import qualified Pipes.Group as Pip
+import qualified Pipes.Prelude as Pip
+import qualified Pipes.Safe as Pip
+import qualified Pipes.Safe.Prelude as Pip
+import qualified Pipes.Text as PipText
+import qualified Pipes.Text.Encoding as PipText
+import qualified Pipes.Text.IO as PipText
+import qualified Symantic.Document as Doc
+import qualified System.FilePath as FP
+import qualified System.IO as IO
+import qualified System.Posix as Posix
+import qualified System.Random as Rand
+import qualified Voting.Protocol as VP
+
+import Hjugement.CLI.Utils
+
+-- ** Type 'Registrar_Options'
+data Registrar_Options = Registrar_Options
+ {   registrar_election_crypto :: VP.FFC
+ ,   registrar_election_uuid   :: VP.UUID
+ } deriving (Show)
+
+api_registrar =
+	"Commands for a registrar."
+	`helps`
+	command "registrar" $
+		rule "PARAMS"
+		 (Registrar_Options
+			 <$> option_crypto
+			 <*> option_uuid
+		 )
+		<?> (
+			api_registrar_credentials <!>
+			api_registrar_pubkey
+		 )
+		<!> api_help False
+run_registrar globOpts =
+	(\opts ->
+		run_registrar_credentials globOpts opts :!:
+		run_registrar_pubkey globOpts opts
+	 ) :!:
+	run_help api_registrar
+
+api_registrar_pubkey =
+	"Derive the public key associated to a specific "<>ref"PRIVATE_CRED"<>"."
+	`helps`
+	command "pubkey" $
+		var "PRIVATE_CRED"
+		<.> response @Natural
+run_registrar_pubkey Global_Options{..} o@Registrar_Options{..} cred =
+	return $
+		VP.reify registrar_election_crypto $ \(_::Proxy c) ->
+			VP.nat $ VP.publicKey $
+				VP.credentialSecretKey @c registrar_election_uuid cred
+
+api_registrar_credentials =
+	"Generate voters' credentials, either "<>ref "COUNT"<>" sequential identities\
+ \ or for all identities on each line of "<>ref "FILE"<>".\
+ \\nThree files are created:\n"<>
+ Doc.ul
+  [ ref"<timestamp>.privcreds" <>
+    " listing the secret key of each voter,\
+    \ each line formatted as: <Registrar>"<>Doc.space<>"<Credential>.\
+    \ It "<>Doc.bold "must be destroyed"<>" after dispatching\
+    \ the credentials to the voters."
+  , ref"<timestamp>.pubcreds" <>
+    " listing the public key of each voter,\
+    \ each line formatted as: <PublicKey>.\
+    \ It "<>Doc.bold "must be sent"<>" to the election administrator.\
+    \ Note that the entries are numerically sorted\
+    \ which forgets whose credential the key belongs to."
+  , ref"<timestamp>.hashcreds" <>
+    " listing the hash of the credential of each voter,\
+    \ each line formatted as: <Registrar>"<>Doc.space<>"<SHA256>.\
+    \ It is used by the hotline to update the public key on the web server."
+  ] `helps`
+	command "credentials" $
+		(var @Natural "COUNT" <!>
+		var @IO.FilePath "FILE")
+		<.> response @Doc
+run_registrar_credentials
+ Global_Options{..}
+ o@Registrar_Options{..} =
+	run_count :!:
+	run_file
+	where
+	run_count count =
+		run_credentials $
+			let i0 = firstIdentity count in
+			(Right <$>) $ Pip.each $
+				T.pack . show
+				 <$> [i0 .. (i0+count)`minusNatural`1]
+	run_file file =
+		run_credentials $
+			let bytes = Pip.withFile file IO.ReadMode PipBS.fromHandle in
+			let idents =
+				Lens.view PipText.lines $
+				Lens.view (PipText.utf8 . PipText.eof) bytes in
+			Pip.concats idents
+	run_credentials identsProd = do
+		now <- Time.getCurrentTime
+		let timestamp = Time.formatTime Time.defaultTimeLocale "%s" now
+		let baseFile = global_dir FP.</> timestamp
+		VP.reify registrar_election_crypto $ \(crypto::Proxy c) ->
+			Pip.runSafeT $ Pip.runEffect $ do
+				-- TODO: match err to check utf8 decoding went well
+				(pubKeys, err) <- Pip.toListM' $
+					identsProd
+					 >-> Pip.mapM (\ident -> do
+						cred <- Pip.liftIO $
+							Rand.getStdRandom $ runState $
+							VP.randomCredential
+						return (ident, cred)
+					 )
+					 >-> Pip.tee (
+						Pip.map (\(ident, VP.Credential cred) -> [ident, " ", cred])
+						 >-> writeFileLn 0o400 (baseFile FP.<.>"privcreds")
+					 )
+					 >-> Pip.mapM (\(ident, cred) ->
+						let secKey = VP.credentialSecretKey @c registrar_election_uuid cred in
+						let pubKey = VP.publicKey secKey in
+						return (ident, pubKey))
+					 >-> Pip.tee (
+						Pip.map (\(ident, pubKey) ->
+							[ident, " ", VP.hexHash $ VP.bytesNat pubKey]
+						 )
+						 >-> writeFileLn 0o444 (baseFile FP.<.>"hashcreds")
+					 )
+					 >-> Pip.map (\(_ident, pubKey) -> pubKey)
+				Pip.each (List.sort pubKeys)
+				 -- NOTE: numerical sort on Natural (not lexicographic on String)
+				 -- which forgets in this file the relationship between
+				 -- the voters' identity and public key.
+				 -- Unfortunately this requires to accumulates all the pubKey in memory.
+				 >-> Pip.map (\pubKey -> [T.pack (show (VP.nat pubKey))])
+				 >-> writeFileLn 0o444 (baseFile FP.<.>"pubcreds")
+		return ""
+
+-- | @('firstIdentity' numIdentities)@ returns @(10'^'i0)@ such that
+-- @(10'^'i0 '+' numIdentities '<=' 10'^'(i0'+'1))@,
+-- that is to say it returns the lowest identity such that
+-- the next @numIdentities@ identities
+-- all have the same number of digits.
+firstIdentity :: Natural -> Natural
+firstIdentity n =
+	((10::Natural) ^) $ (ceiling::Double -> Natural) $
+	logBase 10 $ (fromIntegral n) / 9
diff --git a/src/Hjugement/CLI/Trustee.hs b/src/Hjugement/CLI/Trustee.hs
new file mode 100644
--- /dev/null
+++ b/src/Hjugement/CLI/Trustee.hs
@@ -0,0 +1,206 @@
+{-# LANGUAGE NoMonomorphismRestriction #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE StrictData #-}
+{-# OPTIONS_GHC -Wno-missing-signatures #-}
+module Hjugement.CLI.Trustee where
+
+import Control.Applicative (Applicative(..))
+import Control.Monad (Monad(..), forM, forM_, join, void)
+import Control.Monad.Trans.Class (MonadTrans(..))
+import Control.Monad.Trans.State.Strict (runState, runStateT)
+import Data.Bits (setBit)
+import Data.Bool
+import Data.ByteString (ByteString)
+import Data.Either (Either(..))
+import Data.Eq (Eq(..))
+import Data.Foldable (Foldable, foldMap, length, null)
+import Data.Function (($), (.), id, flip)
+import Data.Functor ((<$>))
+import Data.Int (Int)
+import Data.Maybe (Maybe(..), maybe, fromMaybe)
+import Data.Monoid (Monoid(..))
+import Data.Ord (Ord(..))
+import Data.Proxy (Proxy(..))
+import Data.Semigroup (Semigroup(..))
+import Data.String (String)
+import Data.Text (Text)
+import GHC.Natural (minusNatural, minusNaturalMaybe)
+import GHC.Prim (coerce)
+import Numeric.Natural (Natural)
+import Pipes ((>->))
+import Prelude (logBase, ceiling, Num(..), (/), (^), fromIntegral, Double)
+import Symantic.CLI as CLI
+import Text.Show (Show(..))
+import System.IO (IO, FilePath)
+import qualified Crypto.Hash as Crypto
+import qualified Data.Aeson as JSON
+import qualified Data.ByteArray as ByteArray
+import qualified Data.ByteString as BS
+import qualified Data.ByteString.Char8 as BS8
+import qualified Data.ByteString.Lazy as BSL
+import qualified Data.List as List
+import qualified Data.Text as T
+import qualified Data.Text.Encoding as T
+import qualified Data.Text.Lazy as TL
+import qualified Data.Text.Lazy.Builder as TLB
+import qualified Data.Text.Lazy.Builder.Int as TLB
+import qualified Data.Text.Lazy.Encoding as TL
+import qualified Data.Text.Lazy.IO as TL
+import qualified Data.Time as Time
+import qualified Lens.Family as Lens
+import qualified Lens.Family.State.Strict as Lens
+import qualified Pipes as Pip
+import qualified Pipes.ByteString as PipBS
+import qualified Pipes.Group as Pip
+import qualified Pipes.Prelude as Pip
+import qualified Pipes.Aeson as PipJSON (DecodingError(..))
+import qualified Pipes.Aeson.Unchecked as PipJSON
+import qualified Pipes.Safe as Pip
+import qualified Pipes.Safe.Prelude as Pip
+import qualified Pipes.Text as PipText
+import qualified Pipes.Text.Encoding as PipText
+import qualified Pipes.Text.IO as PipText
+import qualified Symantic.Document as Doc
+import qualified System.FilePath as FP
+import qualified System.IO as IO
+import qualified System.Posix as Posix
+import qualified System.Random as Rand
+import qualified Voting.Protocol as VP
+
+import Hjugement.CLI.Utils
+
+-- * trustee
+data Trustee_Options = Trustee_Options
+ { trustee_election_crypto :: VP.FFC
+ } deriving (Show)
+
+api_trustee =
+	"Commands for a trustee."
+	`helps`
+	command "trustee" $
+		rule "TrusteeOptions"
+		 (Trustee_Options
+			 <$> option_crypto
+		 ) <?> (
+			api_trustee_generate <!>
+			api_trustee_decrypt
+		 )
+		<!> api_help False
+run_trustee globOpts =
+	(\opts ->
+		run_trustee_generate globOpts opts :!:
+		run_trustee_decrypt globOpts opts
+	 ) :!:
+	run_help api_trustee
+
+-- ** generate
+api_trustee_generate =
+ "Run by a trustee to generate a share of an election key.\
+ \ Such a share consists of a private key and a public key with a certificate.\
+ \ Generated files are stored in the current directory with\
+ \ a name that starts with "<>fileRef "ID"<>",\
+ \ where "<>fileRef "ID"<>" is a short fingerprint of the public key.\
+ \ The private key is stored in "<>fileRef "ID.privkey"<>" and must be\
+ \ secured by the trustee. The public key is stored in "<>fileRef "ID.pubkey"<>" and must\
+ \ be sent to the election administrator."
+	`helps`
+	command "generate" $
+		response @()
+run_trustee_generate
+ Global_Options{..}
+ o@Trustee_Options{..} =
+	VP.reify trustee_election_crypto $ \(crypto::Proxy c) -> do
+		keys@(secKey, pubKey) <- Pip.liftIO $ Rand.getStdRandom $ runState $ do
+			secKey <- VP.randomSecretKey @c
+			pubKey <- VP.proveIndispensableTrusteePublicKey secKey
+			return (secKey, pubKey)
+		let pubIdent =
+			T.unpack $ T.toUpper $ T.take 8 $
+			VP.hexHash $ VP.bytesNat $
+			VP.trustee_PublicKey pubKey
+		Pip.runSafeT $ Pip.runEffect $ do
+			Pip.each [pubIdent] >-> pipeInfo (\ident ->
+				"Generated trustee keypair "<>ident<>
+				" in "<>(global_dir FP.</> ident)<>".{privkey,pubkey}"
+			 ) >-> Pip.drain
+			Pip.each [secKey] >-> writeJSON 0o400 (global_dir FP.</> pubIdent FP.<.>"privkey")
+			Pip.each [pubKey] >-> writeJSON 0o444 (global_dir FP.</> pubIdent FP.<.>"pubkey")
+		return ()
+
+-- ** decrypt
+data TrusteeDecrypt_Options = TrusteeDecrypt_Options
+ {   trusteeDecrypt_privkey :: FilePath
+ ,   trusteeDecrypt_url     :: FilePath
+ } deriving (Show)
+
+api_trustee_decrypt =
+	"This command is run by each trustee to perform a partial decryption."
+	`helps`
+	command "decrypt" $
+		rule "TrusteeDecryptOptions"
+		 (TrusteeDecrypt_Options
+			 <$> option_privkey
+			 <*> option_url
+		 )
+		<?> response @(Maybe (VP.DecryptionShare ()))
+	where
+	option_privkey =
+		"Read private key from file "<>ref"FILE"<>"."
+		`helps`
+		long "privkey" (var "FILE")
+	option_url =
+		"Download election files from "<>ref"URL"<>"."<>
+		"\nDefaults to "<>fileRef "."<>"."
+		`helps`
+		longOpt "url" "." (var "URL")
+
+run_trustee_decrypt
+ Global_Options{..}
+ o@Trustee_Options{..}
+ TrusteeDecrypt_Options{..} = do
+	VP.reify trustee_election_crypto $ \(crypto::Proxy c) -> do
+		JSON.eitherDecodeFileStrict' trusteeDecrypt_privkey >>= \case
+		 Left err -> do
+			outputError $
+				Doc.from trusteeDecrypt_privkey<>": "<>
+				Doc.from err<>"\n"
+		 Right (secKey::VP.E c) -> do
+			let pubKey = VP.publicKey secKey
+			let trusteeKeysPath = trusteeDecrypt_url FP.</> "public_keys.jsons"
+			-- Check that the public key is amongst the public keys of the election
+			(keys, ret) <- Pip.runSafeT $ Pip.runEffect $
+				Pip.toListM' $
+				readJSON trusteeKeysPath
+				 >-> Pip.filter ((pubKey ==) . VP.trustee_PublicKey)
+			case ret of
+			 Left err -> outputError err
+			 Right () | null keys -> outputError $
+				"the public key associated with the given secret key "<>
+				"is not within the list of public trustee keys of the election.\n"<>
+				Doc.ul
+				 [ "List of trustees' public keys: "<>Doc.from trusteeKeysPath
+				 , "Trustee's public key: "<>Doc.from (show (VP.nat pubKey))
+				 ]<>"\n"
+			 Right () | List.length keys > 1 -> outputError $
+				"the public key associated with the given secret key "<>
+				"appears more than one time in the list of public trustee keys of the election.\n"<>
+				Doc.ul
+				 [ "List of trustees' public keys: "<>Doc.from trusteeKeysPath
+				 , "Trustee's public key: "<>Doc.from (show (VP.nat pubKey))
+				 ]<>"\n"
+			 Right () -> do
+				-- Tally the encrypted ballots
+				-- FIXME: actually support fetching through an URL
+				let ballotsPath = trusteeDecrypt_url FP.</> "ballots.jsons"
+				((encTally, numBallots), ret) <- Pip.runSafeT $ Pip.runEffect $ do
+					Pip.fold'
+					 (flip VP.insertEncryptedTally)
+					 VP.emptyEncryptedTally id $
+						readJSON ballotsPath
+				case ret of
+				 Left err -> outputError err
+				 Right () -> do
+					decShare <-
+						Rand.getStdRandom $ runState $
+							VP.proveDecryptionShare encTally secKey
+					return $ Just (coerce decShare :: VP.DecryptionShare ())
diff --git a/src/Hjugement/CLI/Utils.hs b/src/Hjugement/CLI/Utils.hs
new file mode 100644
--- /dev/null
+++ b/src/Hjugement/CLI/Utils.hs
@@ -0,0 +1,256 @@
+{-# LANGUAGE NoMonomorphismRestriction #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE Rank2Types #-}
+{-# LANGUAGE StrictData #-}
+{-# LANGUAGE UndecidableInstances #-} -- for VP.Reifies instances
+{-# OPTIONS_GHC -Wno-missing-signatures #-}
+module Hjugement.CLI.Utils where
+
+import Control.Arrow (left)
+import Control.Applicative (Alternative(..))
+import Control.Monad (Monad(..), forM_)
+import Control.Monad.Trans.State.Strict (StateT(..), evalStateT)
+import Data.Bits (setBit)
+import Data.Bool
+import Data.ByteString (ByteString)
+import Data.Either (Either(..))
+import Data.Foldable (Foldable)
+import Data.Function (($), (.), id)
+import Data.Functor ((<$>))
+import Data.Maybe (Maybe(..), maybe)
+import Data.Monoid (Monoid(..))
+import Data.Semigroup (Semigroup(..))
+import Data.Text (Text)
+import Prelude (max, (-))
+import Symantic.CLI as CLI
+import System.IO (IO)
+import Text.Show (Show(..))
+import qualified Crypto.Hash as Crypto
+import qualified Data.Aeson as JSON
+import qualified Data.ByteArray as ByteArray
+import qualified Data.ByteString as BS
+import qualified Data.ByteString.Char8 as BS8
+import qualified Data.ByteString.Lazy.Char8 as BSL8
+import qualified Data.Text as Text
+import qualified Data.Text.Encoding as T
+import qualified Data.Text.Lazy as TL
+import qualified Data.Text.Lazy.Builder as TLB
+import qualified Data.Text.Lazy.Builder.Int as TLB
+import qualified Lens.Family as Lens
+import qualified Lens.Family.State.Strict as Lens
+import qualified Pipes as Pip
+import qualified Pipes.Aeson as PipJSON (DecodingError(..))
+import qualified Pipes.Aeson.Unchecked as PipJSON
+import qualified Pipes.ByteString as PipBS
+import qualified Pipes.Group as Pip
+import qualified Pipes.Parse as Pip
+import qualified Pipes.Prelude as Pip
+import qualified Pipes.Safe as Pip
+import qualified Pipes.Safe.Prelude as Pip
+import qualified Symantic.Document as Doc
+import qualified System.Console.Terminal.Size as Console
+import qualified System.Directory as IO
+import qualified System.FilePath as FP
+import qualified System.IO as IO
+import qualified System.Posix as Posix
+import qualified Voting.Protocol as VP
+
+ref = Doc.underline
+fileRef = ref
+helps = help . Doc.justify
+infixr 0 `helps`
+
+-- * Type 'Doc'
+type Doc = Doc.Plain TLB.Builder
+
+option_template =
+	"Read election template from file "<>ref"FILE"<>"."
+	`help`
+	longOpt "template" "" (var "FILE")
+option_crypto =
+	"Take cryptographic parameters from file "<>fileRef "FILE"<>"."
+	`help`
+	long "crypto" (var "FILE")
+instance CLI.IOType VP.FFC
+instance CLI.FromSegment VP.FFC where
+	fromSegment = JSON.eitherDecodeFileStrict'
+instance VP.Reifies c VP.FFC => CLI.FromSegment (VP.E c) where
+	fromSegment = JSON.eitherDecodeFileStrict'
+option_uuid =
+	"UUID of the election."
+	`help`
+	long "uuid" (var "UUID")
+instance CLI.IOType VP.UUID
+instance CLI.FromSegment VP.UUID where
+	fromSegment = return . left show . VP.readUUID . Text.pack
+instance CLI.IOType VP.Credential
+instance CLI.FromSegment VP.Credential where
+	fromSegment = return . left show . VP.readCredential . Text.pack
+instance IOType (VP.DecryptionShare ())
+instance Outputable (VP.DecryptionShare ()) where
+	output decShare = output $ JSON.encode decShare<>"\n"
+
+api_help full =
+	if full
+	then
+		api_compact <.> response @Doc <!>
+		api_full    <.> response @Doc
+	else
+		(api_compact <!> api_full) <.> response @Doc
+	where
+	api_compact =
+		(if full
+		then help "Print an uncommented grammar tree to help using this program."
+		else id) $
+		tagged (TagShort 'h') (just False)
+	api_full =
+		(if full then help
+		 "Print a grammar tree to help using this program,\
+     \ along with explanations."
+		else id) $
+		tagged (TagLong "help") (just True)
+
+run_help lay = route :!: route
+	where
+	route helpInh_full = do
+		width <- Just . maybe 80 (max 0 . (\x -> x - 2) . Console.width) <$> Console.size
+		return $
+			Doc.setWidth width $
+				runLayout helpInh_full lay
+
+-- * Type 'Global_Options'
+data Global_Options = Global_Options
+ { global_dir :: IO.FilePath
+ }
+
+api_options =
+	rule "OPTIONS" $
+		Global_Options
+		 <$> option_dir
+option_dir =
+	"Use directory "<>ref"DIR"<>" for reading and writing election files."
+	`help`
+	toPermDefault (FP.takeDirectory "file")
+	( tagged (TagLong "dir") (var "DIR") `alt`
+	env "HJUGEMENT_DIR" )
+
+writeFileLn ::
+ Pip.MonadSafe m =>
+ Foldable f =>
+ Posix.FileMode ->
+ IO.FilePath ->
+ Pip.Consumer (f Text) m r
+writeFileLn fileMode filePath =
+	Pip.bracket open close $ \h ->
+		Pip.for Pip.cat $ \xs ->
+			Pip.liftIO $ do
+				forM_ xs $ BS8.hPutStr h . T.encodeUtf8
+				BS8.hPutStrLn h ""
+	where
+	open = Pip.liftIO $ do
+		IO.createDirectoryIfMissing True $ FP.takeDirectory filePath
+		h <- IO.openFile filePath IO.WriteMode
+		return h
+	close h = Pip.liftIO $ do
+		fd <- Posix.handleToFd h
+		Posix.setFdMode fd fileMode
+		IO.hClose h
+
+writeJSON ::
+ Pip.MonadSafe m =>
+ JSON.ToJSON a =>
+ Posix.FileMode ->
+ IO.FilePath ->
+ Pip.Consumer a m r
+writeJSON fileMode filePath =
+	Pip.bracket open close $ \h ->
+		Pip.for Pip.cat $ \a ->
+			Pip.liftIO $ do
+				BSL8.hPutStr h $ JSON.encode a
+	where
+	open = Pip.liftIO $ do
+		IO.createDirectoryIfMissing True $ FP.takeDirectory filePath
+		h <- IO.openFile filePath IO.WriteMode
+		return h
+	close h = Pip.liftIO $ do
+		fd <- Posix.handleToFd h
+		Posix.setFdMode fd fileMode
+		IO.hClose h
+
+readJSON ::
+ Pip.MonadSafe m =>
+ JSON.FromJSON a =>
+ JSON.ToJSON a =>
+ IO.FilePath ->
+ Pip.Producer a m (Either Doc ())
+readJSON filePath =
+	let bytes = Pip.withFile filePath IO.ReadMode PipBS.fromHandle in
+	left handleError <$> Lens.view PipJSON.decoded bytes
+	where
+	handleError (err, _rest) =
+		case err of
+		 PipJSON.AttoparsecError parsingErr ->
+			Doc.from filePath <> ": "<>
+			Doc.redder "parsing error"<>": "<>
+			Doc.from (show parsingErr) <> "\n"
+		 PipJSON.FromJSONError decodingErr ->
+			Doc.from filePath <> ": "<>
+			Doc.redder "decoding error"<>": "<>
+			Doc.from decodingErr <> "\n"
+
+{-
+readJSON' ::
+ Pip.MonadSafe m =>
+ JSON.FromJSON a =>
+ JSON.ToJSON a =>
+ IO.FilePath ->
+ Pip.Parser a m r -> m r
+readJSON' filePath fold =
+	let bytes = Pip.withFile filePath IO.ReadMode PipBS.fromHandle in
+	evalStateT (Lens.zoom PipJSON.decoded fold) bytes
+
+readJSON'' ::
+ Pip.MonadSafe m =>
+ JSON.FromJSON a =>
+ IO.FilePath ->
+ Pip.FreeT (Pip.Producer (Either PipJSON.DecodingError a) m) m ()
+readJSON'' filePath =
+	let bytes = Pip.withFile filePath IO.ReadMode PipBS.fromHandle in
+	parseMany (Pip.parsed_ PipJSON.decode) bytes
+
+parseMany ::
+ forall m inp a r.
+ Monad m =>
+ (Pip.Producer inp m r -> Pip.Producer a m (Pip.Producer inp m r)) ->
+ Pip.Producer inp m r ->
+ Pip.FreeT (Pip.Producer a m) m r
+parseMany f = go0
+	where
+	go0 ::
+	 Pip.Producer inp m r ->
+	 Pip.FreeT (Pip.Producer a m) m r
+	go0 p = Pip.FreeT $ do
+		Pip.next p >>= \case
+		 Left r -> return $ Pip.Pure r
+		 Right (inp, p') -> return $ Pip.Free $ go1 $ Pip.yield inp >> p'
+	go1 ::
+	 Pip.Producer inp m r ->
+	 Pip.Producer a m (Pip.FreeT (Pip.Producer a m) m r)
+	go1 p = go0 <$> f p
+-}
+
+pipeInfo ::
+ Pip.MonadIO m =>
+ Outputable (OnHandle d) =>
+ (a -> d) -> Pip.Pipe a a m r
+pipeInfo d =
+	Pip.for Pip.cat $ \s -> do
+		Pip.liftIO $ do
+			output $ OnHandle IO.stderr (d s)
+			output $ OnHandle IO.stderr '\n'
+		Pip.yield s
+
+outputError :: Doc -> IO (Maybe a)
+outputError msg = do
+	output $ OnHandle @Doc IO.stderr $ Doc.redder "ERROR"<>": "<>msg
+	return Nothing
diff --git a/src/Main.hs b/src/Main.hs
new file mode 100644
--- /dev/null
+++ b/src/Main.hs
@@ -0,0 +1,14 @@
+module Main where
+
+import Data.Function (($))
+import System.IO (IO)
+import qualified Symantic.CLI as CLI
+import qualified System.Environment as Env
+
+import Hjugement.CLI
+
+main :: IO ()
+main = do
+	args <- Env.getArgs
+	-- putStrLn $ "args: " <> show args
+	parseAPI $ CLI.lexer args
diff --git a/stack.yaml b/stack.yaml
new file mode 100644
--- /dev/null
+++ b/stack.yaml
@@ -0,0 +1,16 @@
+resolver: lts-13.19
+packages:
+- '.'
+- location: '../hjugement'
+  extra-dep: true
+- location: '../hjugement-protocol'
+  extra-dep: true
+- location: '../../symantic-document'
+  extra-dep: true
+- location: '../../symantic-cli'
+  extra-dep: true
+extra-deps:
+- pipes-text-0.0.2.5@sha256:16cfd1927817a1c757b15c37ad95c67e819c28b1c4a6ce9757ab15276ec36ac7
+allow-newer: true
+nix:
+  packages: [zlib]