World: r4wp

>> import %./cURL-binding.so

** access error: cannot open: %./cURL-binding.so reason: "not found 
or not valid"

Sujoy, I've also had problems loading my cURL extension library

It seems to depend on the R3 version and the Linux system

Have you tried the latest community R3 build? If that doesn't work, 
perhaps Carl's last release?

These problems seem quite random, so I don't feel like doing more 
work on R3 extensions in C. I'm having similar problems with Red 
extensions for different R3 versions, but at least it solves most 
of the dependency problems with different Linuxes

If all else fails, you need to compile the cURL extension on your 
system from the C source code

You have a better chance of me seeing such a question if you pose 
it in !R3 Extensions

When R3 was open sourced, I presume the SDK was not also open sourced? 
I am looking for the 'C' source code for the RSA, AES and Blowfish 
encryption functions.

The SDK is only for REBOL2, which was not open sourced.

To find source codes, you will need to search with google or so. 
"blowfish source code c" first result looks promising http://www.schneier.com/blowfish-download.html