Function update_keys

Lib/zipfile/__init__.py:727–732

(c)

        return (crc >> 8) ^ crctable[(crc ^ ch) & 0xFF]

    def update_keys(c):
        nonlocal key0, key1, key2
        key0 = crc32(c, key0)
        key1 = (key1 + (key0 & 0xFF)) & 0xFFFFFFFF
        key1 = (key1 * 134775813 + 1) & 0xFFFFFFFF
        key2 = crc32(key1 >> 24, key2)

    for p in pwd:
        update_keys(p)