Java使用异或运算实现简单的加密解密算法实例代码

package cn.std.util;
import java.nio.charset.Charset;
public class DeEnCode {
	private static final String key0 = "FECOI()*&<MNCXZPKL";
	private static final Charset charset = Charset.forName("UTF-8");
	private static byte[] keyBytes = key0.getBytes(charset);
	public static String encode(String enc){
		byte[] b = enc.getBytes(charset);
		for (int i=0,size=b.length;i<size;i++){
			for (byte keyBytes0:keyBytes){
				b[i] = (byte) (b[i]^keyBytes0);
			}
		}
		return new String(b);
	}
	public static String decode(String dec){
		byte[] e = dec.getBytes(charset);
		byte[] dee = e;
		for (int i=0,size=e.length;i<size;i++){
			for (byte keyBytes0:keyBytes){
				e[i] = (byte) (dee[i]^keyBytes0);
			}
		}
		return new String(e);
	}
	public static void main(String[] args) {
		String s="you are right";
		String enc = encode(s);
		String dec = decode(enc);
		System.out.println(enc);
		System.out.println(dec);
	}
}

public static String setEncrypt(String str){
	String sn="ziyu";
	//密钥
	int[] snNum=new int[str.length()];
	String result="";
	String temp="";
	for (int i=0,j=0;i<str.length();i++,j++){
		if(j==sn.length())
		        j=0;
		snNum[i]=str.charAt(i)^sn.charAt(j);
	}
	for (int k=0;k<str.length();k++){
		if(snNum[k]<10){
			temp="00"+snNum[k];
		} else{
			if(snNum[k]<100){
				temp="0"+snNum[k];
			}
		}
		result+=temp;
	}
	return result;
}
public static String getEncrypt(String str){
	String sn="ziyu";
	//密钥
	char[] snNum=new char[str.length()/3];
	String result="";
	for (int i=0,j=0;i<str.length()/3;i++,j++){
		if(j==sn.length())
		        j=0;
		int n=Integer.parseint(str.substring(i*3,i*3+3));
		snNum[i]=(char)((char)n^sn.charAt(j));
	}
	for (int k=0;k<str.length()/3;k++){
		result+=snNum[k];
	}
	return result;
}
}