Cryptographic quine variant

Python 2, 91 bytes

s="import md5;print'MD5 sum of my source is: '+md5.new('s=%r;exec s'%s).hexdigest()";exec s

Using the Python quine variant which doesn't require repeating everything twice. Tested on ideone.

Python 157 149

r='r=%r;import md5;print "MD5 sum of my source is: "+md5.new(r%%r).hexdigest()';import md5;print "MD5 sum of my source is: "+md5.new(r%r).hexdigest()

Output:

MD5 sum of my source is: bb74dfc895c13ab991c4336e75865426

Verification at ideone

Perl + Digest::MD5, 89 bytes

$_=q(use Digest::MD5 md5_hex;say"MD5 sum of my source is: ",md5_hex"\$_=q($_);eval");eval

No TIO link because Digest::MD5 is not installed on TIO. Note that this requires the language conformance level to be set to 5.10 or higher (-M5.010; this doesn't carry a byte penalty according to PPCG rules.

Explanation

This is yet another "print a function of the source code" challenge, meaning that it can be trivially solved via a universal quine constructor.

Universal quine constructor

$_=q(…"\$_=q($_);eval");eval

We use the q() string notation (which nests) to initialize $_, the "default" variable that Perl uses for missing arguments. Then we eval with a missing argument, so that the string inside the q() gets evaluated.

The string inside the q() is a description of how to create the entire program; we specify the rest of the program literally, then use an unescaped $_ to substitute the whole string in for the inside.

The technique thus creates a string with identical contents to the entire program's source; we could print it to produce a quine. We can also do other things to it first, though, making a universal quine constructor.

The rest of the program

use Digest::MD5 md5_hex;say"MD5 sum of my source is: ",md5_hex

Very simple: import an MD5 builtin, then print the fixed string specified in the question (it's not worth compressing it, I believe that in Perl the decompressor would take up more space than just stating the string literally), and use the MD5 builtin on the string we got via the universal quine constructor.