binascii is a Common Lisp library for converting binary data to ASCII
text of some kind. Such conversions are common in email protocols (for
encoding attachments to support old non-8-bit clean transports) or
encoding binary data in HTTP and XML applications. binascii supports
the encodings described in RFC 4648: base64, base32, base16, and
variants. It also supports base85, used in Adobe's PostScript and PDF
document formats, and a variant called ascii85, used by git for binary
It is documented, flexible, and fast, and comes with a BSD license.