DES方式加密

工具方法 DESUtils

java">public class DESUtils {private final static String ALGORITHM = "DES";private final static String charsetName = "UTF-8";public final static String decrypt(String data, String key) throws Exception {return new String(decrypt(hex2byte(data.getBytes(charsetName)), key.getBytes(charsetName)), charsetName);}public final static String encrypt(String data, String key) throws Exception {return byte2hex(encrypt(data.getBytes(charsetName), key.getBytes(charsetName)));}private static byte[] encrypt(byte[] data, byte[] key) {try {SecureRandom sr = new SecureRandom();DESKeySpec dks = new DESKeySpec(key);SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);SecretKey securekey = keyFactory.generateSecret(dks);Cipher cipher = Cipher.getInstance(ALGORITHM);cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);return cipher.doFinal(data);} catch (Exception e) {System.err.print("encrypt fail:\n" + e);return null;}}private static byte[] decrypt(byte[] data, byte[] key) throws Exception {SecureRandom sr = new SecureRandom();DESKeySpec dks = new DESKeySpec(key);SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);SecretKey securekey = keyFactory.generateSecret(dks);Cipher cipher = Cipher.getInstance(ALGORITHM);cipher.init(Cipher.DECRYPT_MODE, securekey, sr);return cipher.doFinal(data);}public static byte[] hex2byte(byte[] b) {if ((b.length % 2) != 0)throw new IllegalArgumentException("the length is not even");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;}public static String byte2hex(byte[] b) {String hs = "";String stmp = "";for (int n = 0; n < b.length; n++) {stmp = (Integer.toHexString(b[n] & 0XFF));if (stmp.length() == 1)hs = hs + "0" + stmp;elsehs = hs + stmp;}return hs.toUpperCase();}
}