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Write own decryption application

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# 1  
Old 02-01-2011
Write own decryption application
Hi ,

I need some help as I dont know where to start. I need to create a unix decryption application.

The information I have been given is this so far:

the specification of the encryption process is:

NET 2 Cryptography classes.

RijndaelManaged encryption algorithm

SHA512Managed class for hashing keys with a blocksize of 128 and a 32 byte key. The HashSize property of the algorithm is 512 and it generates a 64 byte hash key, but then it only uses the first 32 bytes as the key.


not sure where i need to start. Can someone point me in the right direction please.
# 2  
Old 02-01-2011
Looks to me like you should implement the AES-256 symmetric encryption algorithm and the SHA-512 secure hashing algorithm, although the latter uses no key in any way.

Now the question is why you were given this assignment unless your employer/professor assumes that you know that stuff.
# 3  
Old 02-01-2011
no resourse to do this so asked me to try.
thanks for answers any more help will be appreciated
# 4  
Old 02-01-2011
if you can use perl, CPAN module Crypt::CBC would be helpful
# 5  
Old 02-01-2011
thanks for the reply.

Yes i can use perl.. I will read this carefully.
# 6  
Old 02-04-2011
Ok,

I have downloaded the module i need from Crypt::CBC (Crypt-Rijndael-1.09)



I then run
perl Makefile.PL

I get the following:
Code:
Warning: prerequisite Test::Manifest 1.14 not found.
Writing Makefile for Crypt::Rijndael

tried googling this warning but cannot seem to find what i am looking for ( thats a song i think!)

any advise would be appreciated.

Regards
# 7  
Old 02-04-2011
I'd suggest you use either your distributions package manager (yum/apt-get/...) to install this module, or the CPAN command line perl -MCPAN -eshell to install Perl modules, as both will take care of any dependencies.
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