My head hurts. I am trying to build a Perl script to decrypt/encrypt some information.
I have some test information for the project.
Here is what I know about the data I need to decrypt:
Algorithm - The block cipher DES is the standard cipher for all encryption/decryption
operations.
Padding - PKCS #5 padding is used.
Chaining - Cipher Block Chaining (CBC) is used for both key and data cipher operations.
Encoding - All encrypted data is stored Base-64 encoded.
Keys are password based encrypted using DES-MD5 with CBC. All keys are Base-64
encoded.
Keys used within the DES algorithm are 64-bit with and effective key length of 56-bits.
All data is symmetrically encrypted.
I am not sure at this point what Perl Modules will do this for me. I think I need
Crypt::DES as a starter. I am running on an AIX box. I have Perl 5.6.1 from the Bull
distribution installed. I have tried several times to download the Crypt::DES module
which CPAN says is Crypt-DES-2.03.tar.gz.
When I download it (I have done this several times) and try to run gunzip I am told
the file is not in gzip format. I have been gunzip'ing other files with no problem.
So............I am looking for help and direction.
1) What CPAN modules do I need in addition to Crypt::DES to meet the requirements of
the above?
2) Where can I get a good copy of the modules (by the way I am downloading to a
Windows box and FTPing to the RS/6000...the way I have always done it.)
Thanks to anyone who can get me back on track. I have spent 2 days trying to unravel
this and all that is unravelled is my brain ;~{
TIA
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