java 异或加密_使用异或实现一个简单的加密或解密

/*
* Copyright (C) 2017, Megatron King
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.yunshouhu.bouncycastle.xor;
import android.util.Base64;
/**
* StringFog base64+xor encrypt and decrypt implementation.
*
* @author Megatron King
* @since 2018/9/2 14:34
*/
public  class xorEncrypt{
private static final String CHARSET_NAME_UTF_8 = "UTF-8";
public String encrypt(String data, String key) {
String newData;
try {
newData = new String(Base64.encode(xor(data.getBytes(CHARSET_NAME_UTF_8), key), Base64.NO_WRAP));
} catch (Exception e) {
newData = new String(Base64.encode(xor(data.getBytes(), key), Base64.NO_WRAP));
}
return newData;
}
public String decrypt(String data, String key) {
String newData;
try {
newData = new String(xor(Base64.decode(data, Base64.NO_WRAP), key), CHARSET_NAME_UTF_8);
} catch (Exception e) {
newData = new String(xor(Base64.decode(data, Base64.NO_WRAP), key));
}
return newData;
}
/**
public boolean overflow(String data, String key) {
return data != null && data.length() * 4 / 3 >= 1024;
}*/
private static byte[] xor(byte[] data, String key) {
int len = data.length;
int lenKey = key.length();
int i = 0;
int j = 0;
while (i < len) {
if (j >= lenKey) {
j = 0;
}
data[i] = (byte) (data[i] ^ key.charAt(j));
i++;
j++;
}
return data;
}
public static void main(String[] args) {
for(int i=0;i<100;i++)
{
String key="android"+i;
String dataString="java锄禾日当午，汗滴禾下土，谁知盘中餐粒粒皆辛苦";
xorEncrypt xor=new xorEncrypt();
String cipher=xor.encrypt(dataString, key);
System.out.println(cipher);
String textString=xor.decrypt(cipher, key);
if(!textString.equals(dataString))
{
System.err.println("error textString="+textString+",dataString="+dataString);
}else{
System.out.println("textString="+textString);
}
}
System.out.println("==============");
for(int i=0;i<100;i++)
{
String key="android";
String dataString="java锄禾日当午，汗滴禾下土，谁知盘中餐粒粒皆辛苦"+i;
xorEncrypt xor=new xorEncrypt();
String cipher=xor.encrypt(dataString, key);
System.out.println(cipher);
String textString=xor.decrypt(cipher, key);
if(!textString.equals(dataString))
{
System.err.println("error textString="+textString+",dataString="+dataString);
}else{
System.out.println("textString="+textString);
}
}
}
}