base32::hex(n) Base32 encoding base32::hex(n)
base32::hex - base32 extended hex encoding
package require Tcl 8.4
package require base32::core ?0.1?
package require base32::hex ?0.1?
This package provides commands for encoding and decoding of strings into and out of the
extended hex base32 encoding as specified in the RFC 3548bis draft.
This command encodes the given string in extended hex base32 and returns the
encoded string as its result. The result may be padded with the character = to sig-
nal a partial encoding at the end of the input string.
This commands takes the estring and decodes it under the assumption that it is a
valid extended hex base32 encoded string. The result of the decoding is returned as
the result of the command.
Note that while the encoder will generate only uppercase characters this decoder
accepts input in lowercase as well.
The command will always throw an error whenever encountering conditions which sig-
nal some type of bogus input, namely if
 the input contains characters which are not valid output of a extended hex
 the length of the input is not a multiple of eight,
 padding appears not at the end of input, but in the middle,
 the padding has not of length six, four, three, or one characters,
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. The important
feature of the extended hex mapping is that the first 16 codes map to the digits and hex
0 0 9 9 18 I 27 R
1 1 10 A 19 J 28 S
2 2 11 B 20 K 29 T
3 3 12 C 21 L 30 U
4 4 13 D 22 M 31 V
5 5 14 E 23 N
6 6 15 F 24 O
7 7 16 G 25 P
8 8 17 H 26 Q
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other prob-
lems. Please report such in the category base32 of the Tcllib SF Trackers [http://source-
forge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may
have for either package and/or documentation.
base32, hex, rfc3548
Copyright (c) Public domain
base32 0.1 base32::hex(n)