importjava.security.SecureRandom;importjavax.crypto.Cipher;importjavax.crypto.SecretKey;importjavax.crypto.SecretKeyFactory;importjavax.crypto.spec.DESKeySpec;

//結果與DES算法工具一致public classDES{public static voidmain(String[] args) {

String key= "F2C04AD9F598EE61C424C9C7D39BA75F";

String data= "06321643FF8B67EB";

String des=encryptECB3Des(key,data);

System.out.println(des);

}public staticString encryptECB3Des(String key, String src) {

System.out.println("encryptECB3Des->" + "key:" +key);

System.out.println("encryptECB3Des->" + "src:" +src);int len =key.length();if (key == null || src == null) {return null;

}if (src.length() % 16 != 0) {return null;

}if (len == 32) {

String outData= "";

String str= "";for (int i = 0; i < src.length() / 16; i++) {

str= src.substring(i * 16, (i + 1) * 16);

outData+=encECB3Des(key, str);

}returnoutData;

}return null;

}public staticString encECB3Des(String key, String src) {byte[] temp = null;byte[] temp1 = null;

temp1= encryptDes(hexStringToBytes(key.substring(0, 16)), hexStringToBytes(src));

temp= decryptDes(hexStringToBytes(key.substring(16, 32)), temp1);

temp1= encryptDes(hexStringToBytes(key.substring(0, 16)), temp);returnbytesToHexString(temp1);

}public staticString decECB3Des(String key, String src) {byte[] temp2 = decryptDes(hexStringToBytes(key.substring(0, 16)), hexStringToBytes(src));byte[] temp1 = encryptDes(hexStringToBytes(key.substring(16, 32)), temp2);byte[] dest = decryptDes(hexStringToBytes(key.substring(0, 16)), temp1);returnbytesToHexString(dest);

}public static String bytesToHexString(byte[] src) {

StringBuilder stringBuilder= new StringBuilder("");if (src == null || src.length <= 0) {return null;

}for (int i = 0; i < src.length; i++) {int v = src[i] & 0xFF;

String hv=Integer.toHexString(v);if (hv.length() < 2) {

stringBuilder.append(0);

}

stringBuilder.append(hv);

}returnstringBuilder.toString();

}public static byte[] hexStringToBytes(String hexString) {if (hexString == null || hexString.equals("")) {return null;

}

hexString=hexString.toUpperCase();int length = hexString.length() / 2;char[] hexChars =hexString.toCharArray();byte[] d = new byte[length];for (int i = 0; i < length; i++) {int pos = i * 2;

d[i]= (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));

}returnd;

}private static byte charToByte(charc) {return (byte) "0123456789ABCDEF".indexOf(c);

}/*** 3DES(雙倍長) 解密

*

*@paramkeybyte

*@paramsrc

*@return

*/

public staticString decryptECB3Des(String key, String src) {if (key == null || src == null) {return null;

}if (src.length() % 16 != 0) {return null;

}if (key.length() == 32) {

String outData= "";

String str= "";for (int i = 0; i < src.length() / 16; i++) {

str= src.substring(i * 16, (i + 1) * 16);

outData+=decECB3Des(key, str);

}returnoutData;

}return null;

}/*** DES加密

**/

public static byte[] encryptDes(byte[] key, byte[] src) {try{//創建一個DESKeySpec對象

DESKeySpec desKey = newDESKeySpec(key);//創建一個密匙工廠

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");//將DESKeySpec對象轉換成SecretKey對象

SecretKey secretKey =keyFactory.generateSecret(desKey);//Cipher對象實際完成解密操作

Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");//用密匙初始化Cipher對象

cipher.init(Cipher.ENCRYPT_MODE, secretKey);//現在，獲取數據并加密//正式執行加密操作

returncipher.doFinal(src);

}catch(Exception e) {

e.printStackTrace();

}return null;

}/*** des解密

*

*@paramkey

*@paramsrc

*@return

*/

public static byte[] decryptDes(byte[] key, byte[] src) {try{//DES算法要求有一個可信任的隨機數源

SecureRandom random = newSecureRandom();//創建一個DESKeySpec對象

DESKeySpec desKey = newDESKeySpec(key);//創建一個密匙工廠

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");//將DESKeySpec對象轉換成SecretKey對象

SecretKey secretKey =keyFactory.generateSecret(desKey);//Cipher對象實際完成解密操作

Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");//用密匙初始化Cipher對象

cipher.init(Cipher.DECRYPT_MODE, secretKey, random);//現在，獲取數據并加密//正式執行加密操作

returncipher.doFinal(src);

}catch(Exception e) {

e.printStackTrace();

}return null;

}

}

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