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- public class SSL {
- private final static String HEX = "0123456789ABCDEF";
- private final static String ENC = "US-ASCII";
- private static final String RANDOM_ALGORITHM = "SHA1PRNG";
- private static final String CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";
- private static final String SECRET_KEY_ALGORITHM = "AES";
- private static IvParameterSpec ips;
- public static void init(byte[] iv) {
- if(iv == null) {
- iv = new byte[16];
- Random random = new Random();
- random.nextBytes(iv);
- }
- ips = new IvParameterSpec(iv);
- }
- public static byte[] getCertificate() {
- return ips.getIV();
- }
- public static String encrypt(Session current, String cleartext) throws Exception {
- byte[] rawKey = getRawKey(current.getCurrentSession().getBytes(ENC));
- byte[] result = encrypt(rawKey, cleartext.getBytes(ENC));
- return toHex(result);
- }
- public static String decrypt(Session current, String encrypted) throws Exception {
- byte[] rawKey = getRawKey(current.getCurrentSession().getBytes(ENC));
- byte[] enc = toByte(encrypted);
- byte[] result = decrypt(rawKey, enc);
- return new String(result, ENC);
- }
- private static byte[] getRawKey(byte[] seed) throws Exception {
- KeyGenerator kgen = KeyGenerator.getInstance("AES");
- SecureRandom sr = SecureRandom.getInstance(RANDOM_ALGORITHM);
- sr.setSeed(seed);
- kgen.init(128, sr); // 192 and 256 bits may not be available
- SecretKey skey = kgen.generateKey();
- byte[] raw = skey.getEncoded();
- return raw;
- }
- private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
- SecretKeySpec skeySpec = new SecretKeySpec(raw, SECRET_KEY_ALGORITHM);
- Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
- cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ips);
- byte[] encrypted = cipher.doFinal(clear);
- return encrypted;
- }
- private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
- SecretKeySpec skeySpec = new SecretKeySpec(raw, SECRET_KEY_ALGORITHM);
- Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
- cipher.init(Cipher.DECRYPT_MODE, skeySpec, ips);
- byte[] decrypted = cipher.doFinal(encrypted);
- return decrypted;
- }
- public static String toHex(String txt) throws UnsupportedEncodingException {
- return toHex(txt.getBytes(ENC));
- }
- public static String fromHex(String hex) throws UnsupportedEncodingException {
- return new String(toByte(hex), ENC);
- }
- public static byte[] toByte(String hexString) {
- int len = hexString.length()/2;
- byte[] result = new byte[len];
- for (int i = 0; i < len; i++)
- result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue();
- return result;
- }
- public static String toHex(byte[] buf) {
- if (buf == null)
- return "";
- StringBuffer result = new StringBuffer(2*buf.length);
- for (int i = 0; i < buf.length; i++) {
- appendHex(result, buf[i]);
- }
- return result.toString();
- }
- private static void appendHex(StringBuffer sb, byte b) {
- sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));
- }
- }
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