{-# LANGUAGE OverloadedStrings #-}

module Padding (tests) where

import qualified Data.ByteString as B
import Imports

import Crypto.Data.Padding

cases =
    [ ("abcdef", 8, "abcdef\x02\x02")
    , ("abcd", 4, "abcd\x04\x04\x04\x04")
    , ("xyze", 5, "xyze\x01")
    ]

zeroCases =
    [ ("", 4, "\NUL\NUL\NUL\NUL", Nothing)
    , ("abcdef", 8, "abcdef\NUL\NUL", Nothing)
    , ("0123456789abcdef", 16, "0123456789abcdef", Just "0123456789abcdef")
    ]

-- instance Arbitrary where

testPad :: Int -> (B.ByteString, Int, B.ByteString) -> TestTree
testPad n (inp, sz, padded) =
    testCase (show n) $
        propertyHoldCase
            [ eqTest "padded" padded (pad (PKCS7 sz) inp)
            , eqTest "unpadded" (Just inp) (unpad (PKCS7 sz) padded)
            ]

testZeroPad
    :: Int -> (B.ByteString, Int, B.ByteString, Maybe B.ByteString) -> TestTree
testZeroPad n (inp, sz, padded, unpadded) =
    testCase (show n) $
        propertyHoldCase
            [ eqTest "padded" padded (pad (ZERO sz) inp)
            , eqTest "unpadded" unpadded (unpad (ZERO sz) padded)
            ]

tests =
    testGroup
        "Padding"
        [ testGroup "Cases" $ zipWith testPad [1 ..] cases
        , testGroup "ZeroCases" $ zipWith testZeroPad [1 ..] zeroCases
        ]
