Encrypt and decrypt a string in android

Question

Hi I want to encrypt a string in android inorder to store and later for showing I have to decrypt it. Is it possible to do md5 hashing or any other hashing in android. Please provide me an example.

Answer 1

android.util.Base64 encoding is good enough if you want to store something e.g. in a share preferences file:

Here is what I do:

Storing:

public void saveSomeText (String text) {
    SharedPreferences.Editor editor = prefs.edit();
    if (Utils.isEmpty( text ))
        text = null;
    else
        text = Base64.encodeToString( text.getBytes(), Base64.DEFAULT );
    editor.putString( "some_text", text );
    editor.commit();
}

Retrieval:

public String getSomeText () {
    String text = prefs.getString( "some_text", null );
    if (!Utils.isEmpty( passwd )) {
        text = new String( Base64.decode( text, Base64.DEFAULT ) );
    }
    return text;
}

Answer 2

The javax.crypto package does everything you need

http://developer.android.com/reference/javax/crypto/package-summary.html