I use Perl 5.10 ActivePerl 5.14 on win7. I am a humble user, and don't really understand what I am doing.

I have a requirement to connect to a remote host and send locally encrypted messages, using DES ECB mode encryption. This is not my choice, but a part of the requirement. I am trying to find out how to implement DES ECB mode encryption simply in Perl.

I do not have access to a C compiler, and cannot be the local administrator on my machine. I don't have download rights either, but can copy / paste source from CPAN into .pm files in my C:. I have copied the source for DES_PP.pm and ECB.pm to C:\Perl 5.10\lib\Crypt\ from CPAN. I've chosen DES_PP.pm as my understanding is that I don't need a C compiler to use it.

I need to make sure that I am using the ECB hex encryption function correctly. My code currently looks like this:

use Crypt::ECB qw(encrypt decrypt encrypt_hex decrypt_hex);
my $ascii_key = "0123456789abcdef";
my $plain_text = "Now is the time for all ";
print encrypt_hex($ascii_key,"DES_PP",$plain_text,"0");

[download]

This 'works' in that it runs without errors, but produces output:

9a8836c3209081ed369a03f8b488a2ef3c85885f76d95430

From the example I am using in the original DES ECB mode specification (FIPS 81), I should see:

3fa40e8a984d48156a271787ab8883f9893d51ec4b563b53

What am I doing wrong?

Thanks in advance for all responses. Yes, I know there are much better ways of achieving encrypted traffic, and I know too that I should really do things the proper way via full local installation and C compilers etc, but I can't do any of that because of local policies, and still need to solve the problem.

In reply to DES ECB mode using DES_PP by v4169sgr

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