From: Axel Etzold <AEtzold@...>
Date: 2007-09-19T00:04:55+09:00
Subject: Re: file encryption/decryption needed


-------- Original-Nachricht --------
> Datum: Tue, 18 Sep 2007 15:15:28 +0900
> Von: Venkat Bagam <bagam_venkat@hotmail.com>
> An: ruby-talk@ruby-lang.org
> Betreff: file encryption/decryption needed

> Hi Folks,
> 
>              Yesterday, in my ruby application, I was needed to
> encrypt/decrypt a file. I searched for a 2-way encryption technique and
> ended up with ezcrypto gem. I thought to give it a test. I was able to
> encrypt the content and store it in a file but getting errors while
> decrypting the file content and writing to console. I couldn't figure
> out the problem. here is my code
> 
>   require 'rubygems'
>   require 'ezcrypto'
> 
>   @key = EzCrypto::Key.with_password "private documents","salted hash"
>   file1 = File.new("crypto.txt", "w")
>   @encrypted = @key.encrypt "These are private documents"
>   file1.puts @encrypted
>   file1.close
>   puts "Here is the content"
>   file2 = File.read("crypto.txt")
>   puts @key.decrypt file2
> 
> Can anyone figure out the problem? or suggest me a different crypting
> technique other than ezcrypto or suggest me a ruby app implementing such
> a requirement..
> or a code snippet
> 
> any help appreciated
> 
> thanks&regards,
> Venkat
> 
> Attachments:
> http://www.ruby-forum.com/attachment/304/test.rb
> 
> -- 
> Posted via http://www.ruby-forum.com/.

Dear Venkat,

I tried your code and I got a problem about "wrong final block length (OpenSSL::Cipher)", which comes from the fact that you are writing
an additional newline at the end of the encrypted text when
you store it in a file.
So read in the encrypted text from that file, chop off the last newline, and decrypt:

require 'rubygems'
require 'ezcrypto'
@key = EzCrypto::Key.with_password "mighty mouse","salted hash"
file1 = File.new("crypto.txt", "w")
@encrypted = @key.encrypt "This is my super-secret message"
file1.puts @encrypted
file1.close
file2=File.read("crypto.txt").chop
puts @key.decrypt(file2) # => "This is my super-secret message"


Best regards,

Axel 


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