__init__.py 文件源码

def crypto_box_open(c, nonce, pk, sk):
    _assert_min_len('c', c, crypto_box_MACBYTES)
    _assert_len('nonce', nonce, crypto_box_NONCEBYTES)
    _assert_len('pk', pk, crypto_box_PUBLICKEYBYTES)
    _assert_len('sk', sk, crypto_box_SECRETKEYBYTES)

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

    return binary_type(msg)