title: Swift convert base 64 string (which is docx file) to (ns data)
body: <p>I have base64 string which is convertable to docx format file. I checked it in online base64 decoder. In my project I need to convert base64 string to data and sign it using RSA key (which has password and username). In my case I can encode simple string. But when trying to encode base64 string do data , data is nil. So, My question is how can I convert base64 docx fiel to NSData?  </p>