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import java.security.InvalidKeyException; import java.security.Key; import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.KeyGenerator; import javax.crypto.NoSuchPaddingException; public class DESManager { private static final String ALGORITHM = ConstantFactory.PASSWORD_ALGORITHM; private static final String BLOWFISH = ConstantFactory.PASSWORD_ENCRYPT_KEY; private static Key key; static { try { KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM); generator.init(new SecureRandom(BLOWFISH.getBytes())); key = generator.generateKey(); generator = null; } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } } private DESManager() { super(); } /** * @param input * @return the encrypted output * @throws InvalidKeyException * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException * @throws IllegalBlockSizeException * @throws BadPaddingException */ public static String encrypt(String input) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException { return byte2hex(getEncCode(input.getBytes())); } /** * @param input * @return the decrypted output * @throws InvalidKeyException * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException * @throws IllegalBlockSizeException * @throws BadPaddingException */ public static String decrypt(String input) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException { return new String(getDecCode(hex2byte(input.getBytes()))); } /** * @param byteS * @return the enc code * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException */ private static byte[] getEncCode(byte[] byteS) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException { Cipher cipher = Cipher.getInstance(ALGORITHM); cipher.init(Cipher.ENCRYPT_MODE, key); return cipher.doFinal(byteS); } /** * @param byteD * @return the dec code * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException */ private static byte[] getDecCode(byte[] byteD) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException { Cipher cipher = Cipher.getInstance(ALGORITHM); cipher.init(Cipher.DECRYPT_MODE, key); return cipher.doFinal(byteD); } /** * @param b * @return the uppercase hex */ private static String byte2hex(byte[] b) { String hex = ""; String stmp = ""; for (int i = 0; i < b.length; i++) { stmp = Integer.toHexString(b[i] & 0XFF); if (stmp.length() == 1) { hex = hex + '0' + stmp; } else { hex = hex + stmp; } } return hex.toUpperCase(); } /** * @param b * @return the byteFinal */ private static byte[] hex2byte(byte[] b) { if (b.length % 2 != 0) { throw new IllegalArgumentException("b.length % 2 != 0"); } byte[] byteFinal = new byte[b.length / 2]; for (int i = 0; i < b.length; i += 2) { String item = new String(b, i, 2); byteFinal[i / 2] = (byte) Integer.parseInt(item, 16); } return byteFinal; } } |
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