From: "ara.t.howard" <ara.t.howard@...>
Date: 2008-01-22T03:32:12+09:00
Subject: Re: Encrypting/decrypting data


On Jan 21, 2008, at 11:05 AM, laredotornado@zipmail.com wrote:

>
> I'm using the latest version of Ruby for Fedora Core 6 Linux.  I want
> to store credit card info in my database.  I'd like to store it in an
> encrypted form, but I'd also like to be able to decrypt it later.
> Does anyone have any useful encryption/decryption routines?
>
> Thanks, - Dave
>

module Site
   module Encryption
     class << self
       attr_accessor 'mac_address'
       def mac_address
         return @mac_address if defined? @mac_address
         re = %r/[^:\-](?:[0-9A-F][0-9A-F][:\-]){5}[0-9A-F][0-9A-F][^: 
\-]/io
         cmds = '/sbin/ifconfig', '/bin/ifconfig', 'ifconfig',  
'ipconfig /all'

         null = test(?e, '/dev/null') ? '/dev/null' : 'NUL'

         lines = nil
         cmds.each do |cmd|
           stdout = IO.popen("#{ cmd } 2> #{ null }"){|fd|  
fd.readlines} rescue next
           next unless stdout and stdout.size > 0
           lines = stdout and break
         end
         raise "all of #{ cmds.join ' ' } failed" unless lines

         candidates = lines.select{|line| line =~ re}
         raise 'no mac address candidates' unless candidates.first
         candidates.map!{|c| c[re]}

         maddr = candidates.first
         raise 'no mac address found' unless maddr

         maddr.strip!
         maddr.instance_eval{ @list = candidates; def list() @list end }

         @mac_address = maddr
       end
       attr_accessor 'blowfish'
       def blowfish
         @blowfish ||= Crypt::Blowfish.new(key)
       end
       attr_accessor 'key'
       def key
         @key ||= "--#{ mac_address }--#{ hostname }--"[0,56]
       end
       attr_accessor 'hostname'
       def hostname
         @hostname ||= Socket.gethostname
       end
       def encrypt string
         Base64.encode64(blowfish.encrypt_string(string.to_s)).chop #  
kill "\n"
       end
       def decrypt string, kw = {}
         blowfish.decrypt_string(Base64.decode64("#{ string }\n")).strip
       end
     end
   end
   def self.encryption() Encryption end
   def self.encrypt(*a, &b)
     Encryption.encrypt(*a, &b)
   end
   def self.decrypt(*a, &b)
     Encryption.decrypt(*a, &b)
   end
end


you will want to set both the mac_address, the key, or both.  you'll  
need crypt/blowfish for tis to work, obviously.

regards.

a @ http://codeforpeople.com/
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