1 files changed, 27 insertions, 0 deletions
diff --git a/server/src/Model/HashedPassword.hs b/server/src/Model/HashedPassword.hs
new file mode 100644
index 0000000..c71e372
--- /dev/null
+++ b/server/src/Model/HashedPassword.hs
@@ -0,0 +1,27 @@
+module Model.HashedPassword
+  ( hash
+  , check
+  , HashedPassword(..)
+  ) where
+
+import qualified Crypto.BCrypt         as BCrypt
+import           Data.Text             (Text)
+import qualified Data.Text.Encoding    as TE
+
+import           Common.Model.Password (Password (..))
+
+newtype HashedPassword = HashedPassword Text deriving (Show)
+
+hash :: Password -> IO (Maybe HashedPassword)
+hash (Password p) = do
+  hashed <- BCrypt.hashPasswordUsingPolicy BCrypt.slowerBcryptHashingPolicy (TE.encodeUtf8 p)
+  case hashed of
+    Nothing ->
+      return Nothing
+
+    Just h ->
+      return . Just . HashedPassword . TE.decodeUtf8 $ h
+
+check :: Password -> HashedPassword -> Bool
+check (Password p) (HashedPassword h) =
+  BCrypt.validatePassword (TE.encodeUtf8 h) (TE.encodeUtf8 p)