From: Michal Suchanek <hramrach@...>
Date: 2005-09-28T02:20:48+09:00
Subject: Re: How do I (really) encrypt a string in ruby?

On 9/27/05, Bill Kelly <billk@cts.com> wrote:> From: "Michal Suchanek" <hramrach@gmail.com>>> > 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 original> > plaintext, something is rotten here.>> Any chance you're using Windows?  Maybe it's a "text mode" vs. "binary mode" I am on OS X right now.> problem?  (LF -> CRLF in the output)>> If you're on Windows, try:>> STDIN.binmode> STDOUT.binmodeThat does not help (not surprising).
irb(main):010:0> c=OpenSSL::Cipher::Cipher.new("AES-256-CBC")=> #<OpenSSL::Cipher::Cipher:0x789a08>irb(main):011:0> c.encrypt(c.random_key(),c.random_iv())=> #<OpenSSL::Cipher::Cipher:0x789a08>irb(main):012:0> str='0123456789ABCDEF'=> "0123456789ABCDEF"irb(main):013:0> e=c.update(str+str)=> "\021\203\262\321\232@;Z-\257\020\240\343\350@s\236\322d\312U\246ce\221\331\034\2538@h\303"irb(main):014:0> e+=c.final()=> "\021\203\262\321\232@;Z-\257\020\240\343\350@s\236\322d\312U\246ce\221\331\034\2538@h\303\213L\036\2510b\006\353\307b\261#\022\257B\255"irb(main):015:0> e.length=> 48
Thanks
Michal Suchanek

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