From: Jim flip <james@...>
Date: 2007-06-15T18:09:54+09:00
Subject: Re: ezcrypto


here's some basic code that will encrypt a file with blowfish and CBC, 
note it doesn't do the last block of the file that is less than 8 bytes.

require 'openssl'

key = "1234567812345678"
alg = "BF-CBC"
iv = "00000000"

bf = OpenSSL::Cipher::Cipher.new(alg)
bf.encrypt
bf.key = key
bf.iv = iv

File.open("openssl.dat",'wb') do |enc|

  File.open("test.txt","rb") do |f|
  size = File.size("test.txt")
  blocks = size / 8

    for i in 1..blocks
      r = f.read(8)
      cipher = bf.update(r)
      enc << cipher
    end
  end

  enc << bf.final
end

You can also speed it up by doing more efficient read from file, anyhoo 
Openssl file encryption with Blowfish seems ok, I can get back on with 
the work I'm meant to be doing now :)

Jim.

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