@Override
public String decrypt(String input, String key) throws Exception {
String output = "";
SecretKeySpec tempKey = null;
if (input.length() < 1) {
return null;
}
// if user has put in the key, generate a key by the string that user
// has put in
if (key != null) {
tempKey = this.generateKey(key);
} else {
// otherwise use default key
tempKey = defaultKey;
}
cypher.init(Cipher.DECRYPT_MODE, tempKey);
byte[] bytes = SBConvertor.stringToByte(input);
byte[] bResult = cypher.doFinal(bytes);
// create string from byte array
output = new String(bResult);
return output;
}
@Override
public String encrypt(String input, String key) throws Exception {
String output = "";
SecretKeySpec tempKey = null;
if (input.length() < 1) { // string is empty
return null;
}
// if user has put in the key, generate a key by the string that user
// has put in
if (key != null) {
tempKey = this.generateKey(key);
} else {
// otherwise use default key
tempKey = StringEncryptor.defaultKey;
}
cypher.init(Cipher.ENCRYPT_MODE, tempKey);
byte[] bytes = input.getBytes("UTF-8");
byte[] bResult = cypher.doFinal(bytes);
// convert byte array to string
output = SBConvertor.byteToString(bResult);
return output;
}