The base64 encoder/decoder can use some love of the following sort: * The code gated by `USE_OPENSSL_BASE64` should probably be removed, since we haven't used OpenSSL's base64 decoder since 2007, and enabling it will do weird and broken things (Eg: Inputs that aren't broken up into into lines that are < 80 characters will fail to decode correctly). * It would be really nice to have a Base64 encode that doesn't automatically add `\n` characters. * Having a routine to get the encoded output size makes for cleaner code.