1 files changed, 67 insertions, 0 deletions

diff --git a/Data/OpenPGP/Util/Base.hs b/Data/OpenPGP/Util/Base.hs
new file mode 100644
index 0000000..802d503
--- /dev/null
+++ b/Data/OpenPGP/Util/Base.hs
@@ -0,0 +1,67 @@
+module Data.OpenPGP.Util.Base where
+
+import qualified Data.ByteString as BS
+import qualified Data.ByteString.Lazy as LZ
+import Data.Binary (encode)
+
+import Data.OpenPGP as OpenPGP
+import Crypto.Hash.MD5 as MD5
+import Crypto.Hash.SHA1 as SHA1
+import Crypto.Hash.SHA256 as SHA256
+import Crypto.Hash.SHA384 as SHA384
+import Crypto.Hash.SHA512 as SHA512
+import Crypto.Hash.SHA224 as SHA224
+import Crypto.Hash.RIPEMD160 as RIPEMD160
+import qualified Crypto.PubKey.RSA as Vincent.RSA
+import Crypto.PubKey.HashDescr as Vincent
+
+import Data.OpenPGP.Util.Fingerprint (fingerprint)
+
+hashBySymbol OpenPGP.MD5 = MD5.hashlazy
+hashBySymbol OpenPGP.SHA1 = SHA1.hashlazy
+hashBySymbol OpenPGP.SHA256 = SHA256.hashlazy
+hashBySymbol OpenPGP.SHA384 = SHA384.hashlazy
+hashBySymbol OpenPGP.SHA512 = SHA512.hashlazy
+hashBySymbol OpenPGP.SHA224 = SHA224.hashlazy
+hashBySymbol OpenPGP.RIPEMD160 = RIPEMD160.hashlazy
+
+toStrictBS :: LZ.ByteString -> BS.ByteString
+toStrictBS = BS.concat . LZ.toChunks
+
+toLazyBS :: BS.ByteString -> LZ.ByteString
+toLazyBS = LZ.fromChunks . (:[])
+
+find_key :: OpenPGP.Message -> String -> Maybe OpenPGP.Packet
+find_key = OpenPGP.find_key fingerprint
+
+
+
+keyParam :: Char -> OpenPGP.Packet -> Integer
+keyParam c k = fromJustMPI $ lookup c (OpenPGP.key k)
+ where
+    fromJustMPI :: Maybe OpenPGP.MPI -> Integer
+    fromJustMPI (Just (OpenPGP.MPI x)) = x
+    fromJustMPI _ = error "Not a Just MPI, Data.OpenPGP.CryptoAPI"
+
+integerBytesize :: Integer -> Int
+integerBytesize i = fromIntegral $ LZ.length (encode (OpenPGP.MPI i)) - 2
+
+rsaKey :: OpenPGP.Packet -> Vincent.RSA.PublicKey
+rsaKey k =
+    Vincent.RSA.PublicKey (integerBytesize n) n (keyParam 'e' k)
+    where
+    n = keyParam 'n' k
+
+-- http://tools.ietf.org/html/rfc3447#page-43
+-- http://tools.ietf.org/html/rfc4880#section-5.2.2
+hashAlgoDesc OpenPGP.MD5       = Vincent.hashDescrMD5
+hashAlgoDesc OpenPGP.SHA1      = Vincent.hashDescrSHA1
+hashAlgoDesc OpenPGP.RIPEMD160 = Vincent.hashDescrRIPEMD160
+hashAlgoDesc OpenPGP.SHA256    = Vincent.hashDescrSHA256
+hashAlgoDesc OpenPGP.SHA384    = Vincent.hashDescrSHA384
+hashAlgoDesc OpenPGP.SHA512    = Vincent.hashDescrSHA512
+hashAlgoDesc OpenPGP.SHA224    = Vincent.hashDescrSHA224
+hashAlgoDesc _ =
+       error "Unsupported HashAlgorithm in hashAlgoDesc"
+
+