Java的RSA工具类实现了全面的加密和解密功能

设计到的方法如下： DigitalSign init getInstance SignMsgByRelativePath SignMsgByInputStream signMsgByAbsolutePath verifyMsgByInputSteam verifyMsgByAbsolutePath verifyMsgByRelativePath encryptMsg decodeMsg getPriKeyByInputStream getPriKeyByAbsolutePath getPriKeyByRelativePath getPubKeyByInputSteam getPublicKey getPriKey sign appendMap verify