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{-# LANGUAGE ScopedTypeVariables #-}
module Data.OpenPGP.Util.Sign where
import qualified Data.OpenPGP as OpenPGP
import Data.Maybe
import Data.Binary (encode)
import qualified Data.ByteString as BS
import qualified Data.ByteString.Lazy as LZ
import Data.Bits ( (.|.), shiftL )
import Control.Applicative ( (<$>) )
import Data.Time.Clock.POSIX
import Control.Exception as Exception (IOException(..),catch)
import Data.OpenPGP.Util.Fingerprint (fingerprint)
import qualified Crypto.Random as Vincent
import qualified Crypto.PubKey.DSA as Vincent.DSA
import qualified Crypto.PubKey.RSA as Vincent.RSA
import qualified Crypto.PubKey.RSA.PKCS15 as Vincent.RSA
import qualified Crypto.PubKey.ECC.ECDSA as Vincent.ECDSA
import Data.OpenPGP.Util.Base
privateECDSAkey :: OpenPGP.Packet -> Vincent.ECDSA.PrivateKey
privateECDSAkey k = Vincent.ECDSA.PrivateKey curve d
where
d = keyParam 'd' k
curve = curveFromOID (keyParam 'c' k)
privateDSAkey :: OpenPGP.Packet -> Vincent.DSA.PrivateKey
privateDSAkey k = Vincent.DSA.PrivateKey
(Vincent.DSA.Params (keyParam 'p' k) (keyParam 'g' k) (keyParam 'q' k))
(keyParam 'x' k)
privateRSAkey :: OpenPGP.Packet -> Vincent.RSA.PrivateKey
privateRSAkey k =
-- Invert p and q because u is pinv not qinv
Vincent.RSA.PrivateKey pubkey d q p
(d `mod` (q-1))
(d `mod` (p-1))
(keyParam 'u' k)
where
d = keyParam 'd' k
p = keyParam 'p' k
q = keyParam 'q' k
pubkey = rsaKey k
-- | Make a signature
--
-- In order to set more options on a signature, pass in a signature packet.
-- Operation is unsafe in that it silently re-uses "random" bytes when
-- entropy runs out. Use pgpSign for a safer interface.
unsafeSign :: (Vincent.CPRG g) => -- CryptoRandomGen g) =>
OpenPGP.Message -- ^ SecretKeys, one of which will be used
-> OpenPGP.SignatureOver -- ^ Data to sign, and optional signature packet
-> OpenPGP.HashAlgorithm -- ^ HashAlgorithm to use in signature
-> String -- ^ KeyID of key to choose
-> Integer -- ^ Timestamp for signature (unless sig supplied)
-> g -- ^ Random number generator
-> (OpenPGP.SignatureOver, g)
unsafeSign keys over hsh keyid timestamp g = (over {OpenPGP.signatures_over = [sig]}, g')
where
(final, g') = case OpenPGP.key_algorithm sig of
OpenPGP.DSA -> ([dsaR, dsaS], dsaG)
OpenPGP.ECDSA -> ([ecdsaR,ecdsaS],ecdsaG)
kalgo | kalgo `elem` [OpenPGP.RSA,OpenPGP.RSA_S] -> ([toNum rsaFinal], g)
| otherwise ->
error ("Unsupported key algorithm " ++ show kalgo ++ " in sign")
(Vincent.DSA.Signature dsaR dsaS,dsaG) = let k' = privateDSAkey k in
Vincent.DSA.sign g k' (dsaTruncate k' . bhash) dta
(Vincent.ECDSA.Signature ecdsaR ecdsaS,ecdsaG) = let k' = privateECDSAkey k in
Vincent.ECDSA.sign g k' bhash dta
(Right rsaFinal,_) = Vincent.RSA.signSafer g desc (privateRSAkey k) dta
dsaTruncate (Vincent.DSA.PrivateKey (Vincent.DSA.Params _ _ q) _) = BS.take (integerBytesize q)
dta = toStrictBS $ encode over `LZ.append` OpenPGP.trailer sig
sig = findSigOrDefault (listToMaybe $ OpenPGP.signatures_over over)
-- padding = emsa_pkcs1_v1_5_hash_padding hsh
desc = hashAlgoDesc hsh
bhash = hashBySymbol hsh . toLazyBS
toNum = BS.foldl (\a b -> a `shiftL` 8 .|. fromIntegral b) 0
Just k = find_key keys keyid
-- Either a SignaturePacket was found, or we need to make one
findSigOrDefault (Just s) = OpenPGP.signaturePacket
(OpenPGP.version s)
(OpenPGP.signature_type s)
(OpenPGP.key_algorithm k) -- force to algo of key
hsh -- force hash algorithm
(OpenPGP.hashed_subpackets s)
(OpenPGP.unhashed_subpackets s)
(OpenPGP.hash_head s)
(map OpenPGP.MPI final)
findSigOrDefault Nothing = OpenPGP.signaturePacket
4
defaultStype
(OpenPGP.key_algorithm k) -- force to algo of key
hsh
([
-- Do we really need to pass in timestamp just for the default?
OpenPGP.SignatureCreationTimePacket $ fromIntegral timestamp,
OpenPGP.IssuerPacket $ fingerprint k
] ++ (case over of
OpenPGP.KeySignature {} -> [OpenPGP.KeyFlagsPacket {
OpenPGP.certify_keys = True,
OpenPGP.sign_data = True,
OpenPGP.encrypt_communication = False,
OpenPGP.encrypt_storage = False,
OpenPGP.split_key = False,
OpenPGP.authentication = False,
OpenPGP.group_key = False
}]
_ -> []
))
[]
0 -- TODO
(map OpenPGP.MPI final)
defaultStype = case over of
OpenPGP.DataSignature ld _
| OpenPGP.format ld == 'b' -> 0x00
| otherwise -> 0x01
OpenPGP.KeySignature {} -> 0x1F
OpenPGP.SubkeySignature {} -> 0x18
OpenPGP.CertificationSignature {} -> 0x13
now = floor <$> Data.Time.Clock.POSIX.getPOSIXTime
stampit timestamp sig = sig { OpenPGP.hashed_subpackets = hashed' }
where
hashed_stamps = filter isStamp (OpenPGP.hashed_subpackets sig)
unhashed_stamps = filter isStamp (OpenPGP.unhashed_subpackets sig)
hashed' = case hashed_stamps ++ unhashed_stamps of
[] -> OpenPGP.SignatureCreationTimePacket (fromIntegral timestamp)
: OpenPGP.hashed_subpackets sig
_ -> OpenPGP.hashed_subpackets sig
isStamp (OpenPGP.SignatureCreationTimePacket {}) = True
isStamp _ = False
-- | Make a signature
--
-- In order to set more options on a signature, pass in a signature packet.
pgpSign ::
OpenPGP.Message -- ^ SecretKeys, one of which will be used
-> OpenPGP.SignatureOver -- ^ Data to sign, and optional signature packet
-> OpenPGP.HashAlgorithm -- ^ HashAlgorithm to use in signature
-> String -- ^ KeyID of key to choose
-> IO (Maybe OpenPGP.SignatureOver)
pgpSign seckeys dta hash_algo keyid =
handleIO_ (return Nothing) $ do
timestamp <- now
-- g <- Thomas.newGenIO :: IO Thomas.SystemRandom
g <- fmap Vincent.cprgCreate $ Vincent.createEntropyPool
let _ = g :: Vincent.SystemRNG
let sigs = map (stampit timestamp) $ OpenPGP.signatures_over dta
dta' = dta { OpenPGP.signatures_over = sigs }
let (r,g') = unsafeSign seckeys dta' hash_algo keyid timestamp g
return (Just r)
catchIO_ :: IO a -> IO a -> IO a
catchIO_ a h = Exception.catch a (\(_ :: IOException) -> h)
catchIO :: IO a -> (IOException -> IO a) -> IO a
catchIO body handler = Exception.catch body handler
handleIO_ = flip catchIO_
handleIO = flip catchIO
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