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md5加密：
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package com.ncs.pki.util;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MD5Test {
private static MessageDigest digest = null;
public synchronized static final String hash(String data) {
if (digest == null) {
try {
digest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException nsae) {
System.err.println(
"Failed to load the MD5 MessageDigest. "
+ "Jive will be unable to function normally.");
nsae.printStackTrace();
}
}
// Now, compute hash.
digest.update(data.getBytes());
return encodeHex(digest.digest());
}
public static final String encodeHex(byte[] bytes) {
StringBuffer buf = new StringBuffer(bytes.length * 2);
int i;
for (i = 0; i bytes.length; i++) {
if (((int) bytes[i] 0xff) 0x10) {
buf.append("0");
}
buf.append(Long.toString((int) bytes[i] 0xff, 16));
}
return buf.toString();
}
public static String test(){
return null;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(MD5Test.hash("123456"));
}
}
3des加密：
package com.ncs.pki.util;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class DesEncrypt {
/**
*
* 使用DES加密与解密,可对byte[],String类型进行加密与解密 密文可使用String,byte[]存储.
*
* 方法: void getKey(String strKey)从strKey的字条生成一个Key
*
* String getEncString(String strMing)对strMing进行加密,返回String密文 String
* getDesString(String strMi)对strMin进行解密,返回String明文
*
*byte[] getEncCode(byte[] byteS)byte[]型的加密 byte[] getDesCode(byte[]
* byteD)byte[]型的解密
*/
Key key;
/**
* 根据参数生成KEY
*
* @param strKey
*/
public void getKey(String strKey) {
try {
KeyGenerator _generator = KeyGenerator.getInstance("DES");
_generator.init(new SecureRandom(strKey.getBytes()));
this.key = _generator.generateKey();
_generator = null;
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 加密String明文输入,String密文输出
*
* @param strMing
* @return
*/
public String getEncString(String strMing) {
byte[] byteMi = null;
byte[] byteMing = null;
String strMi = "";
BASE64Encoder base64en = new BASE64Encoder();
try {
byteMing = strMing.getBytes("UTF8");
byteMi = this.getEncCode(byteMing);
strMi = base64en.encode(byteMi);
} catch (Exception e) {
e.printStackTrace();
} finally {
base64en = null;
byteMing = null;
byteMi = null;
}
return strMi;
}
/**
* 解密 以String密文输入,String明文输出
*
* @param strMi
* @return
*/
public String getDesString(String strMi) {
BASE64Decoder base64De = new BASE64Decoder();
byte[] byteMing = null;
byte[] byteMi = null;
String strMing = "";
try {
byteMi = base64De.decodeBuffer(strMi);
byteMing = this.getDesCode(byteMi);
strMing = new String(byteMing, "UTF8");
} catch (Exception e) {
e.printStackTrace();
} finally {
base64De = null;
byteMing = null;
byteMi = null;
}
return strMing;
}
/**
* 加密以byte[]明文输入,byte[]密文输出
*
* @param byteS
* @return
*/
private byte[] getEncCode(byte[] byteS) {
byte[] byteFina = null;
Cipher cipher;
try {
cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key);
byteFina = cipher.doFinal(byteS);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}
/**
* 解密以byte[]密文输入,以byte[]明文输出
*
* @param byteD
* @return
*/
private byte[] getDesCode(byte[] byteD) {
Cipher cipher;
byte[] byteFina = null;
try {
cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, key);
byteFina = cipher.doFinal(byteD);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}
public static void main(String[] args) {
System.out.println("des demo");
DesEncrypt des = new DesEncrypt();// 实例化一个对像
des.getKey("MYKEY");// 生成密匙
System.out.println("key=MYKEY");
String strEnc = des.getEncString("111111");// 加密字符串,返回String的密文
System.out.println("密文=" + strEnc);
String strDes = des.getDesString(strEnc);// 把String 类型的密文解密
System.out.println("明文=" + strDes);
}
}
package com.cube.limail.util;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;/**
* 加密解密类
*/
public class Eryptogram
{
private static String Algorithm ="DES";
private String key="CB7A92E3D3491964";
//定义 加密算法,可用 DES,DESede,Blowfish
static boolean debug = false ;
/**
* 构造子注解.
*/
public Eryptogram ()
{
} /**
* 生成密钥
* @return byte[] 返回生成的密钥
* @throws exception 扔出异常.
*/
public static byte [] getSecretKey () throws Exception
{
KeyGenerator keygen = KeyGenerator.getInstance (Algorithm );
SecretKey deskey = keygen.generateKey ();
System.out.println ("生成密钥:"+bytesToHexString (deskey.getEncoded ()));
if (debug ) System.out.println ("生成密钥:"+bytesToHexString (deskey.getEncoded ()));
return deskey.getEncoded ();
} /**
* 将指定的数据根据提供的密钥进行加密
* @param input 需要加密的数据
* @param key 密钥
* @return byte[] 加密后的数据
* @throws Exception
*/
public static byte [] encryptData (byte [] input ,byte [] key ) throws Exception
{
SecretKey deskey = new javax.crypto.spec.SecretKeySpec (key ,Algorithm );
if (debug )
{
System.out.println ("加密前的二进串:"+byte2hex (input ));
System.out.println ("加密前的字符串:"+new String (input ));
} Cipher c1 = Cipher.getInstance (Algorithm );
c1.init (Cipher.ENCRYPT_MODE ,deskey );
byte [] cipherByte =c1.doFinal (input );
if (debug ) System.out.println ("加密后的二进串:"+byte2hex (cipherByte ));
return cipherByte ;
} /**
* 将给定的已加密的数据通过指定的密钥进行解密
* @param input 待解密的数据
* @param key 密钥
* @return byte[] 解密后的数据
* @throws Exception
*/
public static byte [] decryptData (byte [] input ,byte [] key ) throws Exception
{
SecretKey deskey = new javax.crypto.spec.SecretKeySpec (key ,Algorithm );
if (debug ) System.out.println ("解密前的信息:"+byte2hex (input ));
Cipher c1 = Cipher.getInstance (Algorithm );
c1.init (Cipher.DECRYPT_MODE ,deskey );
byte [] clearByte =c1.doFinal (input );
if (debug )
{
System.out.println ("解密后的二进串:"+byte2hex (clearByte ));
System.out.println ("解密后的字符串:"+(new String (clearByte )));
} return clearByte ;
} /**
* 字节码转换成16进制字符串
* @param byte[] b 输入要转换的字节码
* @return String 返回转换后的16进制字符串
*/
public static String byte2hex (byte [] b )
{
String hs ="";
String stmp ="";
for (int n =0 ;n b.length ;n ++)
{
stmp =(java.lang.Integer.toHexString (b [n ] 0XFF ));
if (stmp.length ()==1 ) hs =hs +"0"+stmp ;
else hs =hs +stmp ;
if (n b.length -1 ) hs =hs +":";
} return hs.toUpperCase ();
}
/**
* 字符串转成字节数组.
* @param hex 要转化的字符串.
* @return byte[] 返回转化后的字符串.
*/
public static byte[] hexStringToByte(String hex) {
int len = (hex.length() / 2);
byte[] result = new byte[len];
char[] achar = hex.toCharArray();
for (int i = 0; i len; i++) {
int pos = i * 2;
result[i] = (byte) (toByte(achar[pos]) 4 | toByte(achar[pos + 1]));
}
return result;
}
private static byte toByte(char c) {
byte b = (byte) "0123456789ABCDEF".indexOf(c);
return b;
}
/**
* 字节数组转成字符串.
* @param String 要转化的字符串.
* @return 返回转化后的字节数组.
*/
public static final String bytesToHexString(byte[] bArray) {
StringBuffer sb = new StringBuffer(bArray.length);
String sTemp;
for (int i = 0; i bArray.length; i++) {
sTemp = Integer.toHexString(0xFF bArray[i]);
if (sTemp.length() 2)
sb.append(0);
sb.append(sTemp.toUpperCase());
}
return sb.toString();
}
/**
* 从数据库中获取密钥.
* @param deptid 企业id.
* @return 要返回的字节数组.
* @throws Exception 可能抛出的异常.
*/
public static byte[] getSecretKey(long deptid) throws Exception {
byte[] key=null;
String value=null;
//CommDao dao=new CommDao();
// List list=dao.getRecordList("from Key k where k.deptid="+deptid);
//if(list.size()0){
//value=((com.csc.sale.bean.Key)list.get(0)).getKey();
value = "CB7A92E3D3491964";
key=hexStringToByte(value);
//}
if (debug)
System.out.println("密钥:" + value);
return key;
}
public String encryptData2(String data) {
String en = null;
try {
byte[] key=hexStringToByte(this.key);
en = bytesToHexString(encryptData(data.getBytes(),key));
} catch (Exception e) {
e.printStackTrace();
}
return en;
}
public String decryptData2(String data) {
String de = null;
try {
byte[] key=hexStringToByte(this.key);
de = new String(decryptData(hexStringToByte(data),key));
} catch (Exception e) {
e.printStackTrace();
}
return de;
}
} 加密使用： byte[] key=Eryptogram.getSecretKey(deptid); //获得钥匙（字节数组）
byte[] tmp=Eryptogram.encryptData(password.getBytes(), key); //传入密码和钥匙，获得加密后的字节数组的密码
password=Eryptogram.bytesToHexString(tmp); //将字节数组转化为字符串，获得加密后的字符串密码解密与之差不多
Java中的IO流使用的是Decorator设计模式
所以只要写两个装饰者类
覆盖write和read方法
在write前和read后对原数据进行一些处理（比如异或操作）就可以了
我吃过饭写个贴上来……
--------------------------------------------------------
// EncryptStream.java
import java.io.IOException;
import java.io.OutputStream;
/**
*
* 类型描述 加密流
*
* @since 2009-5-22
* @author 何智刚
*
*/
public class EncryptStream extends OutputStream {
private byte key;
private OutputStream out;
/**
*
* @param key 密钥
* @param in 需要加密的流
*/
public EncryptStream(byte key, OutputStream out) {
this.key = key;
this.out = out;
}
@Override
public void write(int b) throws IOException {
out.write(b ^ key);
}
}
// DecryptStream.java
import java.io.IOException;
import java.io.InputStream;
/**
*
* 类型描述 解密流
*
* @since 2009-5-22
* @author 何智刚
*
*/
public class DecryptStream extends InputStream {
private byte key;
private InputStream in;
/**
*
* @param key 密钥
* @param in 需要解密的流
*/
public DecryptStream(byte key, InputStream in) {
this.key = key;
this.in = in;
}
@Override
public int read() throws IOException {
return in.read() ^ key;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
byte[] temp = new byte[b.length];
int c = in.read(temp, off, len);
for (int i = 0; i b.length; i++) {
b[i] = (byte) (temp[i] ^ key);
}
return c;
}
}
// Client.java
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
public class Client {
public static void main(String[] args) throws Exception {
byte key = 25;
encryptFile("要加密的文件.dat", "加密过的文件.dat", key);
decryptFile("加密过的文件.dat", "解密出来的文件.dat", key);
}
/**
*
* 方法描述 加密文件
*
* @param src 要加密的文件的路径
* @param des 加密过后的文件的存放路径
* @param key 密钥
* @throws Exception
*
* @变更记录 2009-5-22 下午12:42:25 何智刚 创建
*
*/
public static void encryptFile(String src, String des, byte key)
throws Exception {
InputStream in = new FileInputStream(src);
OutputStream out = new EncryptStream(key, new FileOutputStream(des));
byte[] buf = new byte[8192];
int c;
while ((c = in.read(buf)) 0) {
out.write(buf, 0, c);
}
in.close();
out.flush();
out.close();
}
/**
*
* 方法描述 解密文件
*
* @param src 要解密的文件的路径
* @param des 解密过后的文件的存放路径
* @param key 密钥
* @throws Exception
*
* @变更记录 2009-5-22 下午12:43:04 何智刚 创建
*
*/
public static void decryptFile(String src, String des, byte key)
throws Exception {
InputStream in = new DecryptStream(key, new FileInputStream(src));
OutputStream out = new FileOutputStream(des);
byte[] buf = new byte[8192];
int c;
while ((c = in.read(buf)) 0) {
out.write(buf, 0, c);
}
in.close();
out.flush();
out.close();
}
}
-----------------------------------------------
我在例子里没有用BufferedStream，而是自己创建了个byte[]做缓冲区，因为这样性能更好。用BufferedStream的话代码会更简单。