Question

I need a function to encode base64 and a function to decode base64 string in c. I found http://base64.sourceforge.net/b64.c but the functions work on files, not strings, and add line breaks. I need one that simply encodes/decodes strings. Where can I find such a sourcecode?

Answer 1

Get the functions from libb64.

Answer 2

If you have openssl available to you (which most *nix distros seem to have out-of-the-box these days), it provides robust, well-tested base64 encoding/decoding out of the box. This site has a decent code sample: Howto base64 decode with C/C++ and OpenSSL

Answer 3

When I needed to use Base64 encoding to build an encrypted email server, I decided to build my own implementation.

Currently, it s placed within a C++ class; but I wrote the encoding functions without using any c++ specific code, so you can copy and paste as you please.

This implementation is not approved by any organizations; but it should help you with learning how the algorithm works, while also giving you access to just base64 encoding. IE: no extra libraries get included.

https://github.com/AlexBestoso/Base64

Use as you please. The functions take chars, maps them to an integer via bit-wise operations, and then produces your result.

Currently, there s no newline or carriage return, which specified in the MIME implementation.

If you decide to use the code and find any bugs, let me know through github.

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