/**
* @param s
* @return
* @throws GeneralSecurityException
* @throws UnsupportedEncodingException
*/
public static String decrypt(final String s)
throws GeneralSecurityException, UnsupportedEncodingException {
String decrypted = null;
try {
if (s != null) {
final SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
final SecretKey secretKey =
secretKeyFactory.generateSecret(new PBEKeySpec(secret.toCharArray()));
final Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
cipher.init(Cipher.DECRYPT_MODE, secretKey, new PBEParameterSpec(SALT, 20));
final byte[] stringBytes = s.getBytes("UTF-8");
final byte[] decodedBytes = Base64.decode(stringBytes, Base64.DEFAULT);
final byte[] decryptedBytes = cipher.doFinal(decodedBytes);
decrypted = new String(decryptedBytes, "UTF-8");
}
} catch (GeneralSecurityException x) {
throw x;
} catch (UnsupportedEncodingException x) {
throw x;
} catch (Exception x) {
DBG.m(x);
}
return decrypted;
}
/*
* Generate PBE key
*/
private SecretKey getPBEKey(char[] password) throws IOException {
SecretKey skey = null;
try {
PBEKeySpec keySpec = new PBEKeySpec(password);
SecretKeyFactory skFac = SecretKeyFactory.getInstance("PBE");
skey = skFac.generateSecret(keySpec);
} catch (Exception e) {
IOException ioe = new IOException("getSecretKey failed: " + e.getMessage());
ioe.initCause(e);
throw ioe;
}
return skey;
}
private CryptUtils(String passwd) {
try {
char[] chars = new char[passwd.length()];
for (int i = 0; i < chars.length; i++) chars[i] = passwd.charAt(i);
PBEKeySpec pbeKeySpec = new PBEKeySpec(chars);
SecretKeyFactory keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);
// Create PBE encode Cipher
encodeCipher = Cipher.getInstance("PBEWithMD5AndDES");
// Salt
byte[] salt = {
(byte) 0xc7, (byte) 0x73, (byte) 0x21, (byte) 0x8c,
(byte) 0x7e, (byte) 0xc8, (byte) 0xee, (byte) 0x99
};
// Iteration count
int count = 20;
// Create PBE parameter set
PBEParameterSpec encodePbeParamSpec = new PBEParameterSpec(salt, count);
// Initialize PBE encode Cipher with key and parameters
encodeCipher.init(Cipher.ENCRYPT_MODE, pbeKey, encodePbeParamSpec);
// Create PBE decode Cipher
decodeCipher = Cipher.getInstance("PBEWithMD5AndDES");
// Create PBE parameter set
PBEParameterSpec decodePbeParamSpec = new PBEParameterSpec(salt, count);
// Initialize PBE decode Cipher with key and parameters
decodeCipher.init(Cipher.DECRYPT_MODE, pbeKey, decodePbeParamSpec);
} catch (NoSuchPaddingException ex) {
} catch (Exception ex) {
ex.printStackTrace();
}
}
