From: Michal Suchanek <hramrach@...>
Date: 2005-09-28T01:26:18+09:00
Subject: Re: How do I (really) encrypt a string in ruby?

Hello
Thanks for the example. Although ruby complains all the time about keyderivation with encrypt being deprecated I get at least to specify theiv.
However, encrypting 2.0M file gives 2.1M file.Since doing encryption in C makes 2.0M ciphertext from 2.0M plaintext,and it is also possible to decrypt the 2.0M ciphertext to the originalplaintext, something is rotten here.
Am I missing something?
require "openssl"
CHLEN = 256KBITS = 256KLEN = 32IVLEN = 16 # God knows why
f=File.open("testkey");key=f.read(KLEN)f.closef=File.open("testiv")iv=f.read(IVLEN)f.closewhile (chunk=STDIN.read(CHLEN))  cipher=OpenSSL::Cipher::Cipher.new("AES-256-CBC")  cipher.encrypt(key,iv)  cipher.key=key  cipher.iv=iv  STDOUT << cipher.update(chunk)  STDOUT << cipher.final()end




--Support the freedom of music!  Maybe it's a weird genre you would not likeif you heared it .. but weird is *not* illegal.Maybe next time they will send a special forces commando to your picnic .... because they think you are weird.   http://www.music-versus-guns.org          http://en.policejnistat.cz