public String decrypt(String cryptograph, KeyPair keyPair) throws Exception {
        return decrypt(cryptograph, keyPair.getPrivate());
    }
public String decrypt(String cryptograph, KeyPair keyPair) throws Exception {
        return decrypt(cryptograph, keyPair.getPrivate());
    }
public String decrypt ( String cryptograph , KeyPair keyPair ) throws Exception { return decrypt ( cryptograph , keyPair . getPrivate ( ) ) ; }
解密算法

@param cryptograph 密文
@return
@throws Exception
解密算法