Updated 2014-05-21 01:45:05 by RLE

The Tcllib md5 module creates MD5 message digests.

Documentation  edit

official reference (alternate)
official reference, development version

Description  edit

The tcllib implementation of MD5 will defer to the md5 from the Trf package if that is available.

DKF: The version in Tcllib is partially built on MD5Pure.

Hexadecimal Representation  edit

jmn 2004-02-01: Are there some gotchas the novice user should be aware of here? What happens when you use the binary value returned by md5::md5 as part of a string, as in the following snippet taken from Tuplespace
proc tid {tuple} {
    return "\#Tuple[::md5::md5 $tuple]"

See my comments about half way down that page. Basically it looks like md5::md5 of the string hello there test etc returns a value that includes a carriage return. As I guess can be seen by the existence of 0D when you look at the hex result:
% md5 -hex {hello there test etc}

I assume there may be other characters that may cause problems when using the binary result in a string - so presumably one should always use the -hex option for this sort of situation(?)

When and how does one use the binary result then?

PT: You have turned the binary result into the string representation of a binary result there. If you want a string then you should use -hex or in some other way arrange to protect the data. For instance, once a string function is used any embedded nil chars are going to terminate the data. The binary form is required if you are putting the result into a binary format -- for instance a network protocol or embedded into a file format.