DES加密、解密例子
2009-09-17 00:00:00 来源:WEB开发网关于DES加密、解密之类在JE中也有挺多的例子,也不确定这算不算原创。欢迎学习、感谢拍砖指导!
Java代码
/**
* Created by IntelliJ IDEA.
* User: liangj
*/
public class DesKeyManager {
public final static String DEFAULT_KEY = "PKCS5Padding";
protected final static String DES = "DES";
protected static String key;
protected String getKey() {
return key;
}
public static void setKey(String key) {
DesKeyManager.key = key;
}
}
Java代码
import javax.crypto.spec.DESKeySpec;
import javax.crypto.SecretKeyFactory;
import javax.crypto.SecretKey;
import javax.crypto.Cipher;
import java.security.SecureRandom;
/**
* Created by IntelliJ IDEA.
* User: liangj
*/
public class DesEncrypt extends DesKeyManager {
private static DesEncrypt _instance = null;
private DesEncrypt() {
}
public static DesEncrypt getInstance() {
if (_instance == null) {
_instance = new DesEncrypt();
}
return _instance;
}
/**
* 加密
* @param key 密匙,其长度必须是8的倍数
* @param src 数据源
* @return 返回加密后的数据
* @throws Exception
*/
private byte[] encrypt(byte[] key, byte[] src) throws Exception {
//DES算法需要有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
//从原始密匙数据(key)创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
//创建一个密匙工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
//使用密匙工厂把DESKeySpec转换成一个SecretKey对象
SecretKey sk = keyFactory.generateSecret(dks);
//Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(DES);
//用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, sk, sr);
//现在开始对数据源src进行加密
return cipher.doFinal(src);
}
/**
* 二进制转换成十六进制
* @param b
* @return
*/
public String byte2hex(byte[] b) {
String hs = "";
String stmp;
for (byte aB : b) {
stmp = (Integer.toHexString(aB & 0XFF));
if (stmp.length() == 1) {
hs = hs + "0" + stmp;
} else {
hs = hs + stmp;
}
}
return hs.toLowerCase();
}
/**
* 加密方法
* @param src 数据源
* @return
*/
public String encrypt(String src) {
try {
return byte2hex(encrypt(getKey().getBytes(), src.getBytes()));
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public String encrypt(byte[] src) {
try {
return byte2hex(encrypt(getKey().getBytes(), src));
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
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