{-# LANGUAGE OverloadedStrings #-}
module KAT_HKDF (tests) where

import qualified Crypto.KDF.HKDF as HKDF
import Crypto.Hash (SHA256(..), HashAlgorithm)
import qualified Data.ByteString as B

import Imports


data KDFVector hash = KDFVector
    { kdfIKM    :: ByteString
    , kdfSalt   :: ByteString
    , kdfInfo   :: ByteString
    , kdfResult :: ByteString
    }

sha256KDFVectors :: [KDFVector SHA256]
sha256KDFVectors =
    [ KDFVector
        "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
        (B.pack [0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c])
        "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9"
        "\x3c\xb2\x5f\x25\xfa\xac\xd5\x7a\x90\x43\x4f\x64\xd0\x36\x2f\x2a\x2d\x2d\x0a\x90\xcf\x1a\x5a\x4c\x5d\xb0\x2d\x56\xec\xc4\xc5\xbf\x34\x00\x72\x08\xd5\xb8\x87\x18\x58\x65"
    , KDFVector
        (B.pack [0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,0x4e,0x4f])
        (B.pack [0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e,0x7f,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x8b,0x8c,0x8d,0x8e,0x8f,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0x9f,0xa0,0xa1,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf])
        (B.pack [0xb0,0xb1,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xbb,0xbc,0xbd,0xbe,0xbf,0xc0,0xc1,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,0xd0,0xd1,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xdb,0xdc,0xdd,0xde,0xdf,0xe0,0xe1,0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xeb,0xec,0xed,0xee,0xef,0xf0,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfe,0xff])
        (B.pack [0xb1,0x1e,0x39,0x8d,0xc8,0x03,0x27,0xa1,0xc8,0xe7,0xf7,0x8c,0x59,0x6a,0x49,0x34,0x4f,0x01,0x2e,0xda,0x2d,0x4e,0xfa,0xd8,0xa0,0x50,0xcc,0x4c,0x19,0xaf,0xa9,0x7c,0x59,0x04,0x5a,0x99,0xca,0xc7,0x82,0x72,0x71,0xcb,0x41,0xc6,0x5e,0x59,0x0e,0x09,0xda,0x32,0x75,0x60,0x0c,0x2f,0x09,0xb8,0x36,0x77,0x93,0xa9,0xac,0xa3,0xdb,0x71,0xcc,0x30,0xc5,0x81,0x79,0xec,0x3e,0x87,0xc1,0x4c,0x01,0xd5,0xc1,0xf3,0x43,0x4f,0x1d,0x87])
    ]

kdfTests :: [TestTree]
kdfTests =
    [ testGroup "sha256" $ concatMap toKDFTest $ zip is sha256KDFVectors
    ]
  where toKDFTest (i, kdfVector) =
            [ testCase (show i) (t HKDF.extract kdfVector)
            ]

        t :: HashAlgorithm a => (ByteString -> ByteString -> HKDF.PRK a) -> KDFVector a -> Assertion
        t ext v =
            let prk = ext (kdfSalt v) (kdfIKM v)
             in kdfResult v @=? HKDF.expand prk (kdfInfo v) (B.length $ kdfResult v)

        is :: [Int]
        is = [1..]


tests = testGroup "HKDF"
    [ testGroup "KATs" kdfTests
    ]
