- import java.security.SecureRandom;
- import javax.crypto.Cipher;
- import javax.crypto.SecretKey;
- import javax.crypto.SecretKeyFactory;
- import javax.crypto.spec.DESKeySpec;
- public class CryptKit {
- private final static String DES = "DES";
- public static void main(String args[]) throws Exception {
- String str = encrypt("The cold night", "12345678");
- System.out.println(str);
- String str2 = decrypt("63B121C4EA212F8BC74E8113BDFBFB81", "12345678");
- System.out.println(str2);
- }
- // 加密
- public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
- Cipher cipher = Cipher.getInstance(DES);
- DESKeySpec ds = new DESKeySpec(key);
- SecureRandom sr = new SecureRandom();
- SecretKeyFactory skfactory = SecretKeyFactory.getInstance(DES);
- SecretKey skey = skfactory.generateSecret(ds);
- cipher.init(Cipher.ENCRYPT_MODE, skey, sr);
- byte[] b = cipher.doFinal(data);
- return b;
- }
- // 加密
- public static String encrypt(String data, String key) throws Exception {
- return byte2hex(encrypt(data.getBytes(), key.getBytes()));
- }
- // 解密
- public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
- Cipher cipher = Cipher.getInstance(DES);
- DESKeySpec ds = new DESKeySpec(key);
- SecureRandom sr = new SecureRandom();
- SecretKeyFactory skfactory = SecretKeyFactory.getInstance(DES);
- SecretKey skey = skfactory.generateSecret(ds);
- cipher.init(Cipher.DECRYPT_MODE, skey, sr);
- return cipher.doFinal(data);
- }
- // 解密
- public static String decrypt(String data, String key) throws Exception {
- return new String(decrypt(hex2byte(data.getBytes()), key.getBytes()));
- }
- private static String byte2hex(byte[] b) {
- StringBuilder hs = new StringBuilder();
- String stmp;
- for (int n = 0; b != null && n < b.length; n++) {
- stmp = Integer.toHexString(b[n] & 0XFF);
- if (stmp.length() == 1)
- hs.append('0');
- hs.append(stmp);
- }
- return hs.toString().toUpperCase();
- }
- private static byte[] hex2byte(byte[] b) {
- if ((b.length % 2) != 0)
- throw new IllegalArgumentException();
- byte[] b2 = new byte[b.length / 2];
- for (int n = 0; n < b.length; n += 2) {
- String item = new String(b, n, 2);
- b2[n / 2] = (byte) Integer.parseInt(item, 16);
- }
- return b2;
- }
来源: http://www.phpxs.com/code/1001934/