How to Encrypt data to a Plain text without Special character in java

Question

I need a encryption algorithm by whick I can encrypt the data to a simple plain text.

Currently i am using AES encrypting algorithm which converts to encrypt string contains Special character.

Here if i send this string through a query string in url I am missing some character like- "+".

So i need a encrypt logic which is secure and contains only alphabet.

Here is my encryption logic :

      public static String encrypt(String Data) throws Exception {
        Key key = generateKey();
        Cipher c = Cipher.getInstance(ALGO);
        c.init(Cipher.ENCRYPT_MODE, key);
        byte[] encVal = c.doFinal(Data.getBytes());
        String encryptedValue = new BASE64Encoder().encode(encVal);
        return encryptedValue;
    }

    @SuppressWarnings("restriction")
    public static String decrypt(String encryptedData) throws Exception {
        Key key = generateKey();
        Cipher c = Cipher.getInstance(ALGO);
        c.init(Cipher.DECRYPT_MODE, key);
        byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedData);
        byte[] decValue = c.doFinal(decordedValue);
        String decryptedValue = new String(decValue);
        return decryptedValue;
    }

Here I am getting an encrypted String "TEj+TWBQExpz8/p5SAjIhA=="

while I am sending through query string as

localhost:8080/myproject/home?code=TEj+TWBQExpz8/p5SAjIhA==

i am getting the String in controller as-
"TEj TWBQExpz8/p5SAjIhA=="

"+" symbol is missing thats why i am getting issue while decryption.

Please suggest any new Algorithm or any solution to avoid the Special character.

Thank you.

Answer 1

You can encode your crypted part with URLEncoder

URLEncoder.encode("TEj+TWBQExpz8/p5SAjIhA==", "UTF-8")

to make it valid for the URL.

http://docs.oracle.com/javase/8/docs/api/java/net/URLEncoder.html

Answer 2

You should try Apache Commons Base64 URL safe encoder, which will generate what you need.

Hope it helps,

Jose Luis