"""Hashing tests.
"""

from __future__ import division, print_function

import hashlib
from binascii import unhexlify

import rarfile
from rarfile import Blake2SP, CRC32Context, NoHashContext, tohex, Rar3Sha1

def test_nohash():
    assert NoHashContext('').hexdigest() is None
    assert NoHashContext('asd').hexdigest() is None
    md = NoHashContext()
    md.update('asd')
    assert md.digest() is None

def test_crc32():
    assert CRC32Context(b'').hexdigest() == '00000000'
    assert CRC32Context(b'Hello').hexdigest() == 'f7d18982'
    assert CRC32Context(b'Bye').hexdigest() == '4f7ad7d4'

    md = CRC32Context()
    md.update(b'He')
    md.update(b'll')
    md.update(b'o')
    assert md.hexdigest() == 'f7d18982'

def xblake2sp(xdata):
    data = unhexlify(xdata)
    md = Blake2SP()
    md.update(data)
    return md.hexdigest()

def xblake2sp_slow(xdata):
    data = unhexlify(xdata)
    md = Blake2SP()
    buf = memoryview(data)
    pos = 0
    while pos < len(buf):
        md.update(buf[pos : pos+3])
        pos += 3
    return md.hexdigest()


if rarfile._have_blake2:
    def test_blake2sp():
        assert Blake2SP(b'').hexdigest() == 'dd0e891776933f43c7d032b08a917e25741f8aa9a12c12e1cac8801500f2ca4f'
        assert Blake2SP(b'Hello').hexdigest() == '0d6bae0db99f99183d060f7994bb94b45c6490b2a0a628b8b1346ebea8ec1d66'

        assert xblake2sp('') == 'dd0e891776933f43c7d032b08a917e25741f8aa9a12c12e1cac8801500f2ca4f'
        assert xblake2sp('00') == 'a6b9eecc25227ad788c99d3f236debc8da408849e9a5178978727a81457f7239'

        long1 = '000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f3031'
        assert xblake2sp(long1) == '270affa6426f1a515c9b76dfc27d181fc2fd57d082a3ba2c1eef071533a6dfb7'

        long2 = long1 * 20
        assert xblake2sp(long2) == '24a78d92592d0761a3681f32935225ca55ffb8eb16b55ab9481c89c59a985ff3'
        assert xblake2sp_slow(long2) == '24a78d92592d0761a3681f32935225ca55ffb8eb16b55ab9481c89c59a985ff3'

def test_hmac_sha256():
    assert tohex(rarfile.hmac_sha256(b'key', b'data')) == '5031fe3d989c6d1537a013fa6e739da23463fdaec3b70137d828e36ace221bd0'

def test_rar3_sha1():
    for n in range(0, 200):
        data = bytearray([i for i in range(n)])
        h1 = hashlib.sha1(data).hexdigest()
        h2 = Rar3Sha1(data).hexdigest()
        assert h1 == h2

    data = bytearray([(i & 255) for i in range(2000)])
    x1 = hashlib.sha1()
    x2 = Rar3Sha1()
    for step in (3, 17, 67, 128, 157):
        pos = 0
        while pos < len(data):
            pos2 = pos + step
            if pos2 > len(data):
                pos2 = len(data)
            x1.update(data[pos:pos2])
            x2.update(data[pos:pos2])
            assert x1.hexdigest() == x2.hexdigest()
            pos = pos2

def test_rar3_s2k():
    exp = ('a160cb31cb262e9231c0b6fc984fbb0d', 'aa54a659fb0c359b30f353a6343fb11d')
    key, iv = rarfile.rar3_s2k(b'password', unhexlify('00FF00'))
    assert (tohex(key), tohex(iv)) == exp
    key, iv = rarfile.rar3_s2k(u'password', unhexlify('00FF00'))
    assert (tohex(key), tohex(iv)) == exp

    exp = ('ffff33ffaf31987c899ccc2f965a8927', 'bdff6873721b247afa4f978448a5aeef')
    key, iv = rarfile.rar3_s2k(u'p'*28, unhexlify('1122334455667788'))
    assert (tohex(key), tohex(iv)) == exp
    exp = ('306cafde28f1ea78c9427c3ec642c0db', '173ecdf574c0bfe9e7c23bdfd96fa435')
    key, iv = rarfile.rar3_s2k(u'p'*29, unhexlify('1122334455667788'))
    assert (tohex(key), tohex(iv)) == exp

if rarfile._have_crypto:
    def test_pbkdf2_hmac_sha256():
        assert tohex(rarfile.pbkdf2_sha256(b'password', b'salt', 100)) == \
            '07e6997180cf7f12904f04100d405d34888fdf62af6d506a0ecc23b196fe99d8'