How to use the libnacl.crypto_hash_sha256 function in libnacl

# extract data
        fi = ewif_bytes[0:1]
        checksum_from_ewif = ewif_bytes[-2:]
        ewif_no_checksum = ewif_bytes[0:-2]
        salt = ewif_bytes[1:5]
        encryptedhalf1 = ewif_bytes[5:21]
        encryptedhalf2 = ewif_bytes[21:37]

        # check format flag
        if fi != b"\x02":
            raise Exception("Error: bad format version, not EWIF")

        # checksum control
        checksum = libnacl.crypto_hash_sha256(
            libnacl.crypto_hash_sha256(ewif_no_checksum)
        )[0:2]
        if checksum_from_ewif != checksum:
            raise Exception("Error: bad checksum of the EWIF")

        # SCRYPT
        password_bytes = password.encode("utf-8")
        scrypt_seed = scrypt(password_bytes, salt, 16384, 8, 8, 64)
        derivedhalf1 = scrypt_seed[0:32]
        derivedhalf2 = scrypt_seed[32:64]

        # AES
        aes = pyaes.AESModeOfOperationECB(derivedhalf2)
        decryptedhalf1 = aes.decrypt(encryptedhalf1)
        decryptedhalf2 = aes.decrypt(encryptedhalf2)

        # XOR

wif_bytes = Base58Encoder.decode(wif_hex)
        if len(wif_bytes) != 35:
            raise Exception("Error: the size of WIF is invalid")

        # extract data
        checksum_from_wif = wif_bytes[-2:]
        fi = wif_bytes[0:1]
        seed = wif_bytes[1:-2]
        seed_fi = wif_bytes[0:-2]

        # check WIF format flag
        if fi != b"\x01":
            raise Exception("Error: bad format version, not WIF")

        # checksum control
        checksum = libnacl.crypto_hash_sha256(libnacl.crypto_hash_sha256(seed_fi))[0:2]
        if checksum_from_wif != checksum:
            raise Exception("Error: bad checksum of the WIF")

        return cls(seed)

def save_wif_file(self, path: str) -> None:
        """
        Save a Wallet Import Format file (WIF) v1

        :param path: Path to file
        """
        # version
        version = 1

        # add format to seed (1=WIF,2=EWIF)
        seed_fi = b"\x01" + self.seed

        # calculate checksum
        sha256_v1 = libnacl.crypto_hash_sha256(seed_fi)
        sha256_v2 = libnacl.crypto_hash_sha256(sha256_v1)
        checksum = sha256_v2[0:2]

        # base58 encode key and checksum
        wif_key = Base58Encoder.encode(seed_fi + checksum)

        with open(path, "w") as fh:
            fh.write(
                """Type: WIF
Version: {version}
Data: {data}""".format(
                    version=version, data=wif_key
                )

derivedhalf2 = scrypt_seed[32:64]

        # AES
        aes = pyaes.AESModeOfOperationECB(derivedhalf2)
        decryptedhalf1 = aes.decrypt(encryptedhalf1)
        decryptedhalf2 = aes.decrypt(encryptedhalf2)

        # XOR
        seed1 = xor_bytes(decryptedhalf1, derivedhalf1[0:16])
        seed2 = xor_bytes(decryptedhalf2, derivedhalf1[16:32])
        seed = bytes(seed1 + seed2)

        # Password Control
        signer = SigningKey(seed)
        salt_from_seed = libnacl.crypto_hash_sha256(
            libnacl.crypto_hash_sha256(Base58Encoder.decode(signer.pubkey))
        )[0:4]
        if salt_from_seed != salt:
            raise Exception("Error: bad Password of EWIF address")

        return cls(seed)

def get_key_decryption_file(pass_hash, salt):
    """ Gets key for decryption """
    for _index in range(2, 2 ** 17):
        pass_hash = libnacl.crypto_hash_sha512(salt + pass_hash)
    return libnacl.crypto_hash_sha256(salt + pass_hash)

derivedhalf1 = scrypt_seed[0:32]
        derivedhalf2 = scrypt_seed[32:64]

        # AES
        aes = pyaes.AESModeOfOperationECB(derivedhalf2)
        decryptedhalf1 = aes.decrypt(encryptedhalf1)
        decryptedhalf2 = aes.decrypt(encryptedhalf2)

        # XOR
        seed1 = xor_bytes(decryptedhalf1, derivedhalf1[0:16])
        seed2 = xor_bytes(decryptedhalf2, derivedhalf1[16:32])
        seed = bytes(seed1 + seed2)

        # Password Control
        signer = SigningKey(seed)
        salt_from_seed = libnacl.crypto_hash_sha256(
            libnacl.crypto_hash_sha256(Base58Encoder.decode(signer.pubkey))
        )[0:4]
        if salt_from_seed != salt:
            raise Exception("Error: bad Password of EWIF address")

        return cls(seed)

def save_ewif_file(self, path: str, password: str) -> None:
        """
        Save an Encrypted Wallet Import Format file (WIF v2)

        :param path: Path to file
        :param password:
        """
        # version
        version = 1

        # add version to seed
        salt = libnacl.crypto_hash_sha256(
            libnacl.crypto_hash_sha256(Base58Encoder.decode(self.pubkey))
        )[0:4]

        # SCRYPT
        password_bytes = password.encode("utf-8")
        scrypt_seed = scrypt(password_bytes, salt, 16384, 8, 8, 64)
        derivedhalf1 = scrypt_seed[0:32]
        derivedhalf2 = scrypt_seed[32:64]

        # XOR
        seed1_xor_derivedhalf1_1 = bytes(xor_bytes(self.seed[0:16], derivedhalf1[0:16]))
        seed2_xor_derivedhalf1_2 = bytes(
            xor_bytes(self.seed[16:32], derivedhalf1[16:32])
        )

        # AES
        aes = pyaes.AESModeOfOperationECB(derivedhalf2)

def evenCompare(a: str, b: str) -> bool:
    """
    A deterministic but more evenly distributed comparator than simple alphabetical.
    Useful when comparing consecutive strings and an even distribution is needed.
    Provides an even chance of returning true as often as false
    """
    ab = a.encode('utf-8')
    bb = b.encode('utf-8')
    ac = crypto_hash_sha256(ab)
    bc = crypto_hash_sha256(bb)
    return ac < bc