Tcl Library Source Code

EuroTcl/OpenACS 11 - 12 JULY 2024, VIENNA

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base32 - base32 standard encoding

Table Of Contents


package require Tcl 8.5 9
package require base32::core ?0.2?
package require base32 ?0.2?

::base32::encode string
::base32::decode estring


This package provides commands for encoding and decoding of strings into and out of the standard base32 encoding as specified in RFC 3548.


Code map

The code map used to convert 5-bit sequences is shown below, with the numeric id of the bit sequences to the left and the character used to encode it to the right. It should be noted that the characters "0" and "1" are not used by the encoding. This is done as these characters can be easily confused with "O", "o" and "l" (L).

0 A    9 J   18 S   27 3
1 B   10 K   19 T   28 4
2 C   11 L   20 U   29 5
3 D   12 M   21 V   30 6
4 E   13 N   22 W   31 7
5 F   14 O   23 X
6 G   15 P   24 Y
7 H   16 Q   25 Z
8 I   17 R   26 2

Bugs, Ideas, Feedback

This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category base32 of the Tcllib Trackers. Please also report any ideas for enhancements you may have for either package and/or documentation.

When proposing code changes, please provide unified diffs, i.e the output of diff -u.

Note further that attachments are strongly preferred over inlined patches. Attachments can be made by going to the Edit form of the ticket immediately after its creation, and then using the left-most button in the secondary navigation bar.


base32, rfc3548


Text processing


Public domain