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private static byte[] fillTo24(byte[] key) {
if (null != key && key.length == 16) {
return Util.pinJie2(key, Util.subBytes(key, 0, 8));
}
return null;
}
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- 全部代码为:
public class DES3Utils {
// 向量
public final static String iv = "12345678";
// 3des加密
public static final String algorithm = "DESede";
// 加密 src为源数据的字节数组
public static byte[] encryptBy3DES(byte[] src, byte[] key) {
return init(src, key, true, 0);
}
// 解密函数
public static byte[] decryptBy3DES(byte[] src, byte[] key) {
return init(src, key, false, 0);
}
/**
* @param src 需要加密的文字
* @return 加密后的文字
* @throws Exception 加密失败
*/
public static byte[] encryptBy3DESCBC(byte[] src, byte[] key) {
byte[] fillTo24 = fillTo24(key);
if (null == fillTo24)
return null;
try {
SecretKey deskey = new SecretKeySpec(fillTo24, algorithm);
Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
return cipher.doFinal(src);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 3DES解密
*
* @param encryptText 加密文本
* @return
* @throws Exception
*/
public static byte[] decryptBy3DESCBC(byte[] encryptText, byte[] key) {
byte[] fillTo24 = fillTo24(key);
if (null == fillTo24)
return null;
try {
SecretKey deskey = new SecretKeySpec(fillTo24, algorithm);
Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(iv.getBytes());
cipher.init(Cipher.DECRYPT_MODE, deskey, ips);
return cipher.doFinal(encryptText);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* @param src 需要加密的文字
* @return 加密后的文字
* @throws Exception 加密失败
*/
public static byte[] encryptBy3DESECB(byte[] src, byte[] key) {
return init(src, key, true, 1);
}
/**
* 3DES解密
*
* @param encryptText 加密文本
* @return
* @throws Exception
*/
public static byte[] decryptBy3DESECB(byte[] encryptText, byte[] key) {
return init(encryptText, key, false, 1);
}
private static byte[] init(byte[] data, byte[] key, boolean mode, int type) {
byte[] fillTo24 = fillTo24(key);
if (null == fillTo24)
return null;
String types = null;
try {
SecretKey deskey = new SecretKeySpec(fillTo24, algorithm);
switch (type) {
case 0:
types = "DESede";
break;
case 1:
types = "DESede/ECB/NoPadding";
break;
case 2:
types = "DESede/ECB/PKCS5Padding";
break;
}
Cipher cipher = Cipher.getInstance(types);
if (mode)
cipher.init(Cipher.ENCRYPT_MODE, deskey);
else
cipher.init(Cipher.DECRYPT_MODE, deskey);
return cipher.doFinal(data);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
private static byte[] fillTo24(byte[] key) {
if (null != key && key.length == 16) {
return Util.pinJie2(key, Util.subBytes(key, 0, 8));
}
return null;
}
}
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