package de.tud.kom.socom.web.server.util;
import java.security.GeneralSecurityException;
import java.security.Key;
import java.security.MessageDigest;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class EasyEncrypter {
private static final EasyEncrypter instance = new EasyEncrypter();
private static final String KEY = "Q6tq(&S51={7_71C";
private Key secretKey;
private Cipher cipher;
private Logger logger = LoggerFactory.getLogger();
private static char[] goodChar = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A',
'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '0', '2', '3', '4', '5', '6',
'7', '8', '9', '+', '-', '@', };
private static java.util.Random r = new java.util.Random();
private static final int PASSWORD_LENGTH = 20;
private EasyEncrypter() {
try {
secretKey = new SecretKeySpec(KEY.getBytes(), "AES");
cipher = Cipher.getInstance("AES");
} catch (GeneralSecurityException e) {
logger.Error(e);
}
}
public static EasyEncrypter getInstance() {
return instance;
}
public byte[] encryptString(String text) {
try {
byte[] encrypted = text.getBytes("UTF-8");
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
return cipher.doFinal(encrypted);
} catch (Exception e) {
logger.Error(e);
return null;
}
}
public String decryptString(byte[] input) {
try {
cipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] decryptBytes = cipher.doFinal(input);
return new String(decryptBytes, "UTF-8");
} catch (Exception e) {
logger.Error(e);
return null;
}
}
public String getRandomPassword() {
/* Generate a Password object with a random password. */
StringBuffer sb = new StringBuffer();
for (int i = 0; i < PASSWORD_LENGTH; i++) {
sb.append(goodChar[r.nextInt(goodChar.length)]);
}
return sb.toString();
}
public static String getSHA(String input){
try {
MessageDigest md = MessageDigest.getInstance("SHA");
byte[] digest = md.digest(input.getBytes());
StringBuilder sb = new StringBuilder();
for (byte b : digest)
sb.append(String.format("%02x", b));
return sb.toString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}