Thanks Sergey, I have already looked Craig's library, but it does not support RSA and digital certificates and signatures. I have seen Chilkat and Xceed libraries that seem suitable, but I would like to have input from someone who is using a library in the real world.

>Check Craig Boyd's blog at http://www.sweetpotatosoftware.com/SPSBlog, in particular http://www.sweetpotatosoftware.com/SPSBlog/SearchView.aspx?q=encryption
>The Base64 encoding can be done with STRCONV(,13).
>
>
>>I need an encryption library which can do RSA, handel digital certificates, convert to Base64, have som hash funciotns (SHA and MD5). any suggestions?
>>