diff --git a/src/App/Validation/Email.purs b/src/App/Validation/Email.purs
index 6eea5c4..dae456e 100644
--- a/src/App/Validation/Email.purs
+++ b/src/App/Validation/Email.purs
@@ -20,7 +20,7 @@ data Error
   = ParsingError (G.Error EmailParsingError)
 
 min_email_size :: Int
-min_email_size = 20
+min_email_size = 5
 max_email_size :: Int
 max_email_size = 100
 
@@ -41,6 +41,5 @@ parse_full_email = do
 parserEmail :: String -> V (Array Error) String
 parserEmail str = parse parse_full_email str ParsingError
 
--- | TODO
 email :: String -> Either (Array Error) String
 email s = toEither $ parserEmail s
diff --git a/src/App/Validation/Login.purs b/src/App/Validation/Login.purs
new file mode 100644
index 0000000..36ce31a
--- /dev/null
+++ b/src/App/Validation/Login.purs
@@ -0,0 +1,43 @@
+module App.Validation.Login where
+
+import Prelude
+
+import Control.Alt ((<|>))
+import Data.Either (Either(..))
+import Data.String.CodeUnits as CU
+import Data.Maybe (Maybe(..))
+import Data.Validation.Semigroup (V, invalid, toEither)
+
+import GenericParser.RFC5234 (alpha, digit)
+import GenericParser.SomeParsers as SomeParsers
+import GenericParser.Parser as G
+
+data LoginParsingError
+  = CannotParse
+  | CannotEntirelyParse
+  | Size Int Int Int
+
+data Error
+  = ParsingError (G.Error LoginParsingError)
+
+min_login_size :: Int
+min_login_size = 1
+max_login_size :: Int
+max_login_size = 50
+
+parse :: forall e v. G.Parser e v -> String -> ((G.Error e) -> Error) -> V (Array Error) v
+parse (G.Parser p) str c = case p { string: str, position: 0 } of
+  Left x  -> invalid $ [c x]
+  Right x -> pure x.result
+
+login_parser :: G.Parser LoginParsingError String
+login_parser = do
+  l <- G.many1 (alpha <|> digit) <|> G.Parser \i -> G.failureError i.position (Just CannotParse)
+  _ <- SomeParsers.eof <|> G.Parser \i -> G.failureError i.position (Just CannotEntirelyParse)
+  pos <- G.current_position
+  if pos < min_login_size || pos > max_login_size
+  then G.Parser \i -> G.failureError i.position (Just $ Size min_login_size max_login_size pos)
+  else pure $ CU.fromCharArray l
+
+login :: String -> Either (Array Error) String
+login s = toEither $ parse login_parser s ParsingError
diff --git a/src/App/Validation/Password.purs b/src/App/Validation/Password.purs
new file mode 100644
index 0000000..19beea2
--- /dev/null
+++ b/src/App/Validation/Password.purs
@@ -0,0 +1,43 @@
+module App.Validation.Password where
+
+import Prelude
+
+import Control.Alt ((<|>))
+import Data.Either (Either(..))
+import Data.String.CodeUnits as CU
+import Data.Maybe (Maybe(..))
+import Data.Validation.Semigroup (V, invalid, toEither)
+
+import GenericParser.RFC5234 (vchar)
+import GenericParser.SomeParsers as SomeParsers
+import GenericParser.Parser as G
+
+data PasswordParsingError
+  = CannotParse
+  | CannotEntirelyParse
+  | Size Int Int Int
+
+data Error
+  = ParsingError (G.Error PasswordParsingError)
+
+min_password_size :: Int
+min_password_size = 1
+max_password_size :: Int
+max_password_size = 100
+
+parse :: forall e v. G.Parser e v -> String -> ((G.Error e) -> Error) -> V (Array Error) v
+parse (G.Parser p) str c = case p { string: str, position: 0 } of
+  Left x  -> invalid $ [c x]
+  Right x -> pure x.result
+
+password_parser :: G.Parser PasswordParsingError String
+password_parser = do
+  l <- G.many1 vchar <|> G.Parser \i -> G.failureError i.position (Just CannotParse)
+  _ <- SomeParsers.eof <|> G.Parser \i -> G.failureError i.position (Just CannotEntirelyParse)
+  pos <- G.current_position
+  if pos < min_password_size || pos > max_password_size
+  then G.Parser \i -> G.failureError i.position (Just $ Size min_password_size max_password_size pos)
+  else pure $ CU.fromCharArray l
+
+password :: String -> Either (Array Error) String
+password s = toEither $ parse password_parser s ParsingError