public static byte[] decodeWebSafe(String s) throws Base64DecoderException {
    byte[] bytes = s.getBytes();
    return decodeWebSafe(bytes, 0, bytes.length);
  }
Decodes data from web safe Base64 notation.
Web safe encoding uses '-' instead of '+', '_' instead of '/'

@param s the string to decode (decoded in default encoding)
@return the decoded data
android/android_framework/base/src/main/java/com/google/android/vending/licensing/util/Base64.java