设计到的方法如下:DigitalSigninitgetInstanceSignMsgByRelativePathSignMsgByInputStreamsignMsgByAbsolutePathverifyMsgByInputSteamverifyMsgByAbsolutePathverifyMsgByRelativePathencryptMsgdecodeMsggetPriKeyByInputStreamgetPriKeyByAbsolutePathgetPriKeyByRelativePathgetPubKeyByInputSteamgetPublicKeygetPriKeysignappendMapverify