md5key.setData(R.sg(16).next());
}
//获取系统的公钥
SystemConfig sysPubKey = dao.fetch(SystemConfig.class, "enc.sys.pubkey");
SystemConfig sysPriKey = dao.fetch(SystemConfig.class, "enc.sys.prikey");
PublicKey publicKey = null;
PrivateKey privateKey = null;
if (sysPubKey == null) {
try {
KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA");