aes_xts_crypt
aes_xts_crypt(key, in, out, AES_XTS_BLOCKSIZE, true);
aes_xts_crypt(key, in, out, AES_XTS_BLOCKSIZE, false);
aes_xts_crypt(vctx, in, out, len, true);
aes_xts_crypt(vctx, in, out, len, false);