Base64 encoded data maximum size

Question

I have a security mechanism that implements symmetric algorithm RijndaelManaged. I managed to find information what is the maximum size of encrypted data using

Answer 1

If you need to check this programatically, you can do so by checking the modulus. Here's some psudocode (no particular language) :

function base64Inflation (numBytes)
    minimumBase64Bytes = roundDown(numBytes / 3 * 4)    
    modulus = numberOfBytes % 3             // Assuming % is the modulo operator
    if modulus == 0 
        return minimumBase64Bytes           // Exact fit! No padding required.
    else
        return minimumBase64Bytes + 4       // Doesn't quite fit. We need to pad.

I've also implemented the same logic in golang:

http://play.golang.org/p/JK9XPAle5_