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from binascii import hexlify, unhexlify

from ..crypto.low_level import AES, bytes_to_long, bytes_to_int, long_to_bytes, hmac_sha256, blake2b_256
from ..crypto.low_level import increment_iv, bytes16_to_int, int_to_bytes16
from ..crypto.low_level import hkdf_hmac_sha512
from . import BaseTestCase


class CryptoTestCase(BaseTestCase):

    def test_bytes_to_int(self):
        self.assert_equal(bytes_to_int(b'\0\0\0\1'), 1)

    def test_bytes_to_long(self):
        self.assert_equal(bytes_to_long(b'\0\0\0\0\0\0\0\1'), 1)
        self.assert_equal(long_to_bytes(1), b'\0\0\0\0\0\0\0\1')

    def test_bytes16_to_int(self):
        self.assert_equal(bytes16_to_int(b'\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1'), 1)
        self.assert_equal(int_to_bytes16(1), b'\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1')
        self.assert_equal(bytes16_to_int(b'\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0\0'), 2 ** 64)
        self.assert_equal(int_to_bytes16(2 ** 64), b'\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0\0')

    def test_increment_iv(self):
        iv0 = b'\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'
        iv1 = b'\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1'
        iv2 = b'\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\2'
        self.assert_equal(increment_iv(iv0, 0), iv0)
        self.assert_equal(increment_iv(iv0, 1), iv1)
        self.assert_equal(increment_iv(iv0, 2), iv2)
        iva = b'\0\0\0\0\0\0\0\0\xff\xff\xff\xff\xff\xff\xff\xff'
        ivb = b'\0\0\0\0\0\0\0\1\x00\x00\x00\x00\x00\x00\x00\x00'
        ivc = b'\0\0\0\0\0\0\0\1\x00\x00\x00\x00\x00\x00\x00\x01'
        self.assert_equal(increment_iv(iva, 0), iva)
        self.assert_equal(increment_iv(iva, 1), ivb)
        self.assert_equal(increment_iv(iva, 2), ivc)
        self.assert_equal(increment_iv(iv0, 2**64), ivb)

    def test_aes(self):
        key = b'X' * 32
        data = b'foo' * 10
        # encrypt
        aes = AES(is_encrypt=True, key=key)
        self.assert_equal(bytes_to_long(aes.iv, 8), 0)
        cdata = aes.encrypt(data)
        self.assert_equal(hexlify(cdata), b'c6efb702de12498f34a2c2bbc8149e759996d08bf6dc5c610aefc0c3a466')
        self.assert_equal(bytes_to_long(aes.iv, 8), 2)
        # decrypt
        aes = AES(is_encrypt=False, key=key)
        self.assert_equal(bytes_to_long(aes.iv, 8), 0)
        pdata = aes.decrypt(cdata)
        self.assert_equal(data, pdata)
        self.assert_equal(bytes_to_long(aes.iv, 8), 2)

    def test_hmac_sha256(self):
        # RFC 4231 test vectors
        key = b'\x0b' * 20
        # Also test that this works with memory views
        data = memoryview(unhexlify('4869205468657265'))
        hmac = unhexlify('b0344c61d8db38535ca8afceaf0bf12b'
                         '881dc200c9833da726e9376c2e32cff7')
        assert hmac_sha256(key, data) == hmac
        key = unhexlify('4a656665')
        data = unhexlify('7768617420646f2079612077616e7420'
                         '666f72206e6f7468696e673f')
        hmac = unhexlify('5bdcc146bf60754e6a042426089575c7'
                         '5a003f089d2739839dec58b964ec3843')
        assert hmac_sha256(key, data) == hmac
        key = b'\xaa' * 20
        data = b'\xdd' * 50
        hmac = unhexlify('773ea91e36800e46854db8ebd09181a7'
                         '2959098b3ef8c122d9635514ced565fe')
        assert hmac_sha256(key, data) == hmac
        key = unhexlify('0102030405060708090a0b0c0d0e0f10'
                        '111213141516171819')
        data = b'\xcd' * 50
        hmac = unhexlify('82558a389a443c0ea4cc819899f2083a'
                         '85f0faa3e578f8077a2e3ff46729665b')
        assert hmac_sha256(key, data) == hmac

    def test_blake2b_256(self):
        # In BLAKE2 the output length actually is part of the hashes personality - it is *not* simple truncation like in
        # the SHA-2 family. Therefore we need to generate test vectors ourselves (as is true for most applications that
        # are not precisely vanilla BLAKE2b-512 or BLAKE2s-256).
        #
        # Obtained via "b2sum" utility from the official BLAKE2 repository. It calculates the exact hash of a file's
        # contents, no extras (like length) included.
        assert blake2b_256(b'', b'abc') == unhexlify('bddd813c634239723171ef3fee98579b94964e3bb1cb3e427262c8c068d52319')
        assert blake2b_256(b'a', b'bc') == unhexlify('bddd813c634239723171ef3fee98579b94964e3bb1cb3e427262c8c068d52319')
        assert blake2b_256(b'ab', b'c') == unhexlify('bddd813c634239723171ef3fee98579b94964e3bb1cb3e427262c8c068d52319')
        assert blake2b_256(b'abc', b'') == unhexlify('bddd813c634239723171ef3fee98579b94964e3bb1cb3e427262c8c068d52319')

        key = unhexlify('e944973af2256d4d670c12dd75304c319f58f4e40df6fb18ef996cb47e063676')
        data = memoryview(b'1234567890' * 100)
        assert blake2b_256(key, data) == unhexlify('97ede832378531dd0f4c668685d166e797da27b47d8cd441e885b60abd5e0cb2')

    # These test vectors come from https://www.kullo.net/blog/hkdf-sha-512-test-vectors/
    # who claims to have verified these against independent Python and C++ implementations.

    def test_hkdf_hmac_sha512(self):
        ikm = b'\x0b' * 22
        salt = bytes.fromhex('000102030405060708090a0b0c')
        info = bytes.fromhex('f0f1f2f3f4f5f6f7f8f9')
        l = 42

        okm = hkdf_hmac_sha512(ikm, salt, info, l)
        assert okm == bytes.fromhex('832390086cda71fb47625bb5ceb168e4c8e26a1a16ed34d9fc7fe92c1481579338da362cb8d9f925d7cb')

    def test_hkdf_hmac_sha512_2(self):
        ikm = bytes.fromhex('000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f2021222324252627'
                            '28292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f')
        salt = bytes.fromhex('606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868'
                             '788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeaf')
        info = bytes.fromhex('b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7'
                             'd8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff')
        l = 82

        okm = hkdf_hmac_sha512(ikm, salt, info, l)
        assert okm == bytes.fromhex('ce6c97192805b346e6161e821ed165673b84f400a2b514b2fe23d84cd189ddf1b695b48cbd1c838844'
                                    '1137b3ce28f16aa64ba33ba466b24df6cfcb021ecff235f6a2056ce3af1de44d572097a8505d9e7a93')

    def test_hkdf_hmac_sha512_3(self):
        ikm = bytes.fromhex('0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b')
        salt = None
        info = b''
        l = 42

        okm = hkdf_hmac_sha512(ikm, salt, info, l)
        assert okm == bytes.fromhex('f5fa02b18298a72a8c23898a8703472c6eb179dc204c03425c970e3b164bf90fff22d04836d0e2343bac')

    def test_hkdf_hmac_sha512_4(self):
        ikm = bytes.fromhex('0b0b0b0b0b0b0b0b0b0b0b')
        salt = bytes.fromhex('000102030405060708090a0b0c')
        info = bytes.fromhex('f0f1f2f3f4f5f6f7f8f9')
        l = 42

        okm = hkdf_hmac_sha512(ikm, salt, info, l)
        assert okm == bytes.fromhex('7413e8997e020610fbf6823f2ce14bff01875db1ca55f68cfcf3954dc8aff53559bd5e3028b080f7c068')

    def test_hkdf_hmac_sha512_5(self):
        ikm = bytes.fromhex('0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c')
        salt = None
        info = b''
        l = 42

        okm = hkdf_hmac_sha512(ikm, salt, info, l)
        assert okm == bytes.fromhex('1407d46013d98bc6decefcfee55f0f90b0c7f63d68eb1a80eaf07e953cfc0a3a5240a155d6e4daa965bb')