From: laredotornado <laredotornado@...>
Date: 2008-01-22T07:09:57+09:00
Subject: Re: Encrypting/decrypting data

On Jan 21, 12:32 pm, "ara.t.howard" <ara.t.how...@gmail.com> wrote:
> On Jan 21, 2008, at 11:05 AM, laredotorn...@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/
> --
> share your knowledge.  it's a way to achieve immortality.
> h.h. the 14th dalai lama

I'm trying to install ruby blowfish, which I got from this link --
http://webscripts.softpedia.com/scriptDownload/Crypt-Blowfish-Download-18480.html.
But when logged in as root to my Fedora Core 6 Linux box, this is the
error I got when trying to install:

[root@mymachine crypt_blowfish-0.6.1]# ruby make.rb
Do you want to install the binary (b) or pure-ruby (r) core? (b/r)?
r
make.rb:22: private method `rm' called for File:Class (NoMethodError)
        from make.rb:9:in `loop'
        from make.rb:9


I get the same result if I choose the "b" option. - Dave