Hope that's the right subforum to ask.
Found out that I need something like this (http://lenschulwitz.com/base58) and this (http://gobittest.appspot.com/PrivateKey) for secure offline usage. Actually, I need:
1) base58 encode/decode (somehow I can find only online tools and libraries on google and nothing that could be just used offline) 
2) sha256 hash (tried to use built in Notepad++ but somehow results are quite different from sha256 on http://gobittest.appspot.com/PrivateKey, seems I'm misunderstanding something here)

If these tools could bulk work on files with multiple strings (like input.txt->output.txt) this would be perfect. Maybe someone knows what should I use? I'm not very good at coding, so I'm looking for something simple to use/install.

Also if there is some tool to bulk validate WIFC format private keys (by validating I mean situation like: I have 10k+ strings, each 52 symbols, beginning with K. I need to check which strings are properly generated WIFC keys that can be used as, you know, private keys and write the correct ones to the output file) it could be very handy.   


Thanks!