keywrap.py 文件源码

def _wrap_core(wrapping_key, a, r, backend):
    # RFC 3394 Key Wrap - 2.2.1 (index method)
    encryptor = Cipher(AES(wrapping_key), ECB(), backend).encryptor()
    n = len(r)
    for j in range(6):
        for i in range(n):
            # every encryption operation is a discrete 16 byte chunk (because
            # AES has a 128-bit block size) and since we're using ECB it is
            # safe to reuse the encryptor for the entire operation
            b = encryptor.update(a + r[i])
            # pack/unpack are safe as these are always 64-bit chunks
            a = struct.pack(
                ">Q", struct.unpack(">Q", b[:8])[0] ^ ((n * j) + i + 1)
            )
            r[i] = b[-8:]

    assert encryptor.finalize() == b""

    return a + b"".join(r)