DESUtil.java
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package com.bjivt.util.symmetric;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
* 对称加密工具类
* @author zsf
*
*/
public class DESUtil {
Key key;
public DESUtil() {
}
public DESUtil(String str) {
setKey(str); // 生成密匙
}
public Key getKey() {
return key;
}
public void setKey(Key key) {
this.key = key;
}
private static final String secretKey="JiMeiJiaJuO@O";
/**
* 根据参数生成 KEY
*/
public void setKey (String strKey) {
try {
KeyGenerator _generator = KeyGenerator.getInstance("DES");
//防止linux下 随机生成key
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
secureRandom.setSeed(strKey.getBytes());
_generator.init(56,secureRandom);
this.key = _generator.generateKey();
_generator = null;
} catch (Exception e) {
throw new RuntimeException(
"Error initializing SqlMap class. Cause: " + e);
}
}
/**
* 加密 String 明文输入 ,String 密文输出
*/
public String encryptStr(String strMing) {
byte[] byteMi = null;
byte[] byteMing = null;
String strMi = "";
BASE64Encoder base64en = new BASE64Encoder();
setKey(secretKey); // 生成密匙
try {
byteMing = strMing.getBytes("UTF8");
byteMi = this.encryptByte(byteMing);
strMi = base64en.encode(byteMi);
} catch (Exception e) {
throw new RuntimeException(
"Error initializing SqlMap class. Cause: " + e);
} 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 decryptStr(String strMi) {
BASE64Decoder base64De = new BASE64Decoder();
byte[] byteMing = null;
byte[] byteMi = null;
String strMing = "";
setKey(secretKey); // 生成密匙
try {
byteMi = base64De.decodeBuffer(strMi);
byteMing = this.decryptByte(byteMi);
strMing = new String(byteMing, "UTF8");
} catch (Exception e) {
throw new RuntimeException(
"Error initializing SqlMap class. Cause: " + e);
} 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[] encryptByte(byte[] byteS) {
byte[] byteFina = null;
Cipher cipher;
try {
cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
byteFina = cipher.doFinal(byteS);
} catch (Exception e) {
throw new RuntimeException(
"Error initializing SqlMap class. Cause: " + e);
} finally {
cipher = null;
}
return byteFina;
}
/**
* 解密以 byte[] 密文输入 , 以 byte[] 明文输出
*
* @param byteD
* @return
*/
private byte[] decryptByte(byte[] byteD) {
Cipher cipher;
byte[] byteFina = null;
try {
cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key);
byteFina = cipher.doFinal(byteD);
} catch (Exception e) {
throw new RuntimeException(
"Error initializing SqlMap class. Cause: " + e);
} finally {
cipher = null;
}
return byteFina;
}
public static void main(String[] args) throws Exception {
DESUtil des = new DESUtil();
String str1 = "李大霄";
// DES 加密字符串
String str2 = des.encryptStr(str1);
// DES 解密字符串
String deStr = des.decryptStr(str2);
System.out.println(" 加密前： " + str1);
System.out.println(" 加密后： " + str2);
System.out.println(" 加密后长度： " + str2.length());
System.out.println(" 解密后： " + deStr);
System.out.println("---------------------");
}
}