public static String decodeToString(String base64Encoded) {
        byte[] encodedBytes = CodecSupport.toBytes(base64Encoded);
        return decodeToString(encodedBytes);
    }
Converts the specified UTF-8 Base64 encoded String and decodes it to a resultant UTF-8 encoded string.

@param base64Encoded a UTF-8 Base64 encoded String
@return the decoded String, UTF-8 encoded.
src/main/java/org/apache/shiro/lang/codec/Base64.java