package iminto.util.common;

import java.io.IOException;

import java.security.NoSuchAlgorithmException;

import iminto.util.encypt.Base64Decoder;

import iminto.util.encypt.Base64Encoder;

import iminto.util.encypt.MD5;

/**

*

* 基于密匙的xor加解密

* 可以进行安全的二进制加密

*

*/

public class XorEncrypt {

/**

* 私有密匙

*/

private String privateKey = "EnCR5hOR_inchenwang97768038542121L";

/**

* 密匙

*/

private String key;

/**

* 协同密匙

*/

private String companionKey;

/**

*

* @param key 公有密匙

* @throws NoSuchAlgorithmException

*/

public XorEncrypt(String key) throws NoSuchAlgorithmException {

this.key = MD5.md5(privateKey + key);

this.companionKey = this.genCompanion(key);

}

/**

* 设置私有密匙

* @param privateKey

*/

public void setPrivateKey(String privateKey) {

this.privateKey = privateKey;

}

/**

* 制取取协同密匙

* @param $key

* @return

*/

private String genCompanion(String key) {

StringBuilder strBuilder = new StringBuilder();

byte[] keys = key.getBytes();

strBuilder.append(privateKey);

for (byte _key : keys) {

strBuilder.append(_key);

}

return strBuilder.toString();

}

/**

* 异或加解密

* @param Mixed $content

* @param String $pKey

* @return String

*/

private String getXorBilateral(String content, String pKey) {

int len = pKey.length();

int count = content.length();

char current;

StringBuilder strBuilder = new StringBuilder();

int kIdx = 0;

int i = 0;

for (i = 0; i < count; i++) {

if (kIdx == len) {

kIdx = 0;

}

current = content.charAt(i);

strBuilder.append((char) (current ^ pKey.charAt(kIdx)));

kIdx++;

}

return strBuilder.toString();

}

/**

* 加密

* @param content

* @return String

* @throws IOException

*/

public String encrypt(String content) throws IOException {

String randKey = RandomHelper.toString(16);

content = getXorBilateral(content, this.key);

content = getXorBilateral(content, randKey);

content = randKey + content;

content = getXorBilateral(content, this.companionKey);

content = new Base64Encoder().encode(content);

return content;

}

/**

* 解密

* @param content

* @return String

* @throws IOException

*/

public String decrypt(String content) throws IOException {

content = new Base64Decoder().decode(content);

content = getXorBilateral(content, this.companionKey);

String randKey = StringHelper.subString(content, 0, 16);

content = StringHelper.subString(content, 16, -1);

content = getXorBilateral(content, randKey);

content = getXorBilateral(content, this.key);

return content;

}

public static void main(String[] args) throws NoSuchAlgorithmException, IOException {

XorEncrypt x=new XorEncrypt("iminto");

System.out.println(x.encrypt("test"));

}

}