__init__.py 文件源码

def crypto_box_open_afternm(c, nonce, k):
    _assert_min_len('c', c, crypto_box_MACBYTES)
    _assert_len('nonce', nonce, crypto_box_NONCEBYTES)
    _assert_len('k', k, crypto_box_BEFORENMBYTES)

    msg = bytearray(len(c) - crypto_box_MACBYTES)
    _raise_on_error(
        lib.crypto_box_open_easy_afternm(
            ffi.cast("unsigned char *", ffi.from_buffer(msg)),
            c,
            len(c),
            nonce,
            k,
        ),
    )

    return binary_type(msg)