帮忙提供一加密算法

to sxgz(三毛) 这样加密出来的看得出有序的吧

MD5算法加密
public String generatemd5string(String csinput)
 {
 byte[] b, b2 ;
 StringBuffer buf ;
 String csreturn = null ; try
 {
 b = csinput.getBytes("iso-8859-1") ;
 MessageDigest md = MessageDigest.getInstance("MD5") ;
 md.update(b) ;
 b2 = md.digest() ; buf = new StringBuffer(b2.length * 2) ;
 for (int nLoopindex = 0 ; nLoopindex < b2.length ; nLoopindex++)
 {
 if ( ( (int) b2[nLoopindex] & 0xff) < 0x10)
 {
 buf.append("0") ;
 }
 buf.append(Long.toString( (int) b2[nLoopindex] & 0xff, 16)) ;
 }
 csreturn = new String(buf) ;
 }
 catch (Exception e)
 {
 e.printStackTrace() ;
 csreturn = null ;
 } return csreturn ;
 }

/**
* FileName: Encryptstr.java
* Description: 字符串加密：通过指定相同长度的key字符串，将源字符串和Key字符串的Ascii码进行异或，并进行简单操作，获得加密后的数字字符串
* Copyright: Copyright (c) 2003
* @Author: Totodo
* @Email: [email protected]
* @Version: 1.0
*/
public class Encryptstr {
static String sWrong;
static String sSkey="207806514039";public Encryptstr() {
sWrong="";
}public static String encryptkey(String sKey,int iLength) {
//获取指定长度的key
String sKeystr=sKey;
int kLength;
kLength=sKey.length();
if (iLength<=kLength)
sKeystr=sKey.substring(0,iLength); //截取和加密字符串长度相等的key
else {
//重复key使长度相等
while (kLength<iLength) {
if (kLength+sKey.length()>=iLength) {
sKeystr=sKeystr+sKey.substring(0,iLength-kLength);
}
else {
sKeystr=sKeystr+sKey;
}
kLength=sKeystr.length();
}
}
return sKeystr;

}public String encrypt(String sKey,String sSource) {
//加密字符串
String sTarget="";
String sKeystr;//和加密字符串长度相等的key
int sLength;//加密字符串长度
char cS,cK,cT;
int iS,iK,iT;
int i;

if (sSource=="") {
sWrong="字符串为空！";
return sTarget;
}
if (sKey=="") {
sWrong="请指定密钥！";
return sTarget;
}

sLength=sSource.length();
sKeystr=encryptkey(sKey,sLength);

for (i=0;i<sLength;i++) {
cS=sSource.charAt(i);
cK=sKeystr.charAt(i);
iS=(int)cS;
iK=(int)cK;
iT=iS^iK;
// System.out.print(iS);
// System.out.print(" ");
// System.out.print(iK);
// System.out.print(" ");
// System.out.print(iT);
// System.out.print(" ");
// System.out.println(iT+29);
iT=iT+29;
iT=1000+iT/10%10*100+iT/100*10+iT%10;//十位、百位、个位
sTarget=sTarget+Integer.toString(iT).substring(1);
}

return sTarget;
}public String encrypt(String sSource) {
return encrypt(sSkey,sSource);
}public static String decode(String sKey,String sTarget) {
//解密

String sSource="";
String sKeystr;//和解密字符串长度相等的key
int sLength; //解密字符串长度
char cS,cK;
String cT;
int iS,iK,iT;
int i; if (sTarget=="") {
sWrong="字符串为空！";
return sSource;
}
if (sKey=="") {
sWrong="请指定密钥！";
return sSource;
}

sLength=sTarget.length()/3;
sKeystr=encryptkey(sKey,sLength);

for (i=0;i<sLength;i++) {
cT=sTarget.substring(i*3,(i+1)*3);
cK=sKeystr.charAt(i);
iT=Integer.parseInt(cT);
iT=iT/10%10*100+iT/100*10+iT%10;
iK=(int)cK;
iS=(iT-29)^iK;
// System.out.print(iT);
// System.out.print(" ");
// System.out.print(iT-29);
// System.out.print(" ");
// System.out.print(iK);
// System.out.print(" ");
// System.out.println(iS);
cS=(char)iS;
sSource=sSource+cS;
} return sSource;
}public static String decode(String sTarget) {
return decode(sSkey,sTarget);
}public static void main(String[] args) throws Exception{
String str;
Encryptstr en_str = new Encryptstr();
str=en_str.encrypt("abcde");
System.out.println("abcde加密后的字符传:"+str);
System.out.println("adcde解迷后的字符船:"+decode("207806514039",str));
}
}

package test;/**
* Title: 
* Description: 
* Copyright: Copyright (c) 2004
* Company: 
* @author not attributable
* @version 1.0
*/
import java.io.*;import javax.crypto.*;
import java.security.*;public class DESCryptoTest {
 public static void main(String[] args) {
// Security.addProvider(new com.sun.crypto.provider.SunJCE());
 Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
 KeyGenerator kg = null;
 try {
 //指定算法,这里为DES;如果想用Blowfish算法,则用 getInstance("Blowfish")
 //BouncyCastle基本上支持所有通用标准算法
 kg = KeyGenerator.getInstance("DES", "BC"); //指定密钥长度,长度越高,加密强度越大
 kg.init(56); //产生密钥
 Key key = kg.generateKey();
 System.out.println("Key format: " + key.getFormat());
 System.out.println("Key algorithm: " + key.getAlgorithm()); //加密要用Cipher来实现
 Cipher cipher = Cipher.getInstance("DES");
 System.out.println("Cipher provider: " + cipher.getProvider());
 System.out.println("Cipher algorithm: " + cipher.getAlgorithm()); byte[] data = "Hello World!".getBytes();
 System.out.println("Original data : [" + data.length + "]" +
 new String(data)); //设置加密模式
 cipher.init(Cipher.ENCRYPT_MODE, key);
 byte[] result = cipher.doFinal(data);
 System.out.println("Encrypted data: [" + result.length + "]" +
 new String(result)); //设置解密模式
 cipher.init(Cipher.DECRYPT_MODE, key);
 byte[] original = cipher.doFinal(result);
 System.out.println("Decrypted data: [" + original.length + "]" +
 new String(original)); String filename = "加密前.txt";
 //读入并加密文件
 try {
 //输入流
 cipher.init(Cipher.ENCRYPT_MODE, key);
 BufferedInputStream in = new BufferedInputStream(new FileInputStream(filename));
 //输出流
 CipherOutputStream out = new CipherOutputStream(new BufferedOutputStream(new FileOutputStream("加密后.txt")), cipher);
 int i;
 do {
 i = in.read();
 if (i != -1)
 out.write(i);
 }
 while (i != -1); in.close();
 out.close();
 System.out.println("加密文件完成！");
 }
 catch (Exception ey5) {
 System.out.println("Error when encrypt the file");
 System.exit(0);
 } try {
 cipher.init(Cipher.DECRYPT_MODE, key);
 //输出流
 BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream("解密后.txt"));
 //输入流
 CipherInputStream in = new CipherInputStream(new BufferedInputStream(
 new FileInputStream("加密后.txt")), cipher); int i;
 do {
 i = in.read();
 if (i != -1)
 out.write(i);
 }
 while (i != -1); in.close();
 out.close();
 System.out.println("解密文件完成！");
 }
 catch (Exception ey5) {
 System.out.println("Error when encrypt the file");
 System.exit(0);
 }
 }
 catch (Exception e) {
 e.printStackTrace();
 }
 }
}

调试易

帮忙提供一加密算法

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