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William J. Middleton


encode_base64 - Encode string using base64 encoding

decode_base64 - Decode base64 string


 use MIME::Base64;

 $encoded = encode_base64('Aladdin:open sesame');
 $decoded = decode_base64($encoded);


This module provides functions to encode and decode strings into the Base64 encoding specified in RFC 2045 - MIME (Multipurpose Internet Mail Extensions). The Base64 encoding is designed to represent arbitrary sequences of octets in a form that need not be humanly readable. A 65-character subset ([A-Za-z0-9+/=]) of US-ASCII is used, enabling 6 bits to be represented per printable character.

The following functions are provided:

encode_base64($str, [$eol])

Encode data by calling the encode_base64() function. The first argument is the string to encode. The second argument is the line ending sequence to use (it is optional and defaults to "\n"). The returned encoded string is broken into lines of no more than 76 characters each and it will end with $eol unless it is empty. Pass an empty string as second argument if you do not want the encoded string broken into lines.


Decode a base64 string by calling the decode_base64() function. This function takes a single argument which is the string to decode and returns the decoded data. Any character not part of the legal base64 chars is ignored.

If you prefer not to import these routines into your namespace you can call them as:

    use MIME::Base64 ();
    $encoded = MIME::Base64::encode($decoded);
    $decoded = MIME::Base64::decode($encoded);


Copyright 1995-1997 Gisle Aas.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

Distantly based on LWP::Base64 written by Martijn Koster <m.koster@nexor.co.uk> and Joerg Reichelt <j.reichelt@nexor.co.uk> and code posted to comp.lang.perl <3pd2lp$6gf@wsinti07.win.tue.nl> by Hans Mulder <hansm@wsinti07.win.tue.nl>

The XS implementation use code from metamail. Copyright 1991 Bell Communications Research, Inc. (Bellcore)