On Tuesday, July 16, 2013 6:06:49 PM UTC-4, James Coglan wrote:
>
> Here's a more concise expression of the problem: these two programs 
> produce different outputs. I need to fix the Node program so it does the 
> same thing as the Ruby one:
>
> https://gist.github.com/jcoglan/6015439 
>

The problem is you're using the wrong cipher creation method in node. You 
want crypto.createDecipheriv().

Since the default IV for non-ECB (and you really should *not* be using ECB) 
ciphers in Ruby is all nulls/zeroes, you need to supply this to 
createDecipheriv like so:

var crypto = require('crypto');

var message = 'ZsHUBYxu9tNHB3sOpT7ICQ==',
    key     = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
    cipher  = crypto.createDecipheriv('aes-256-cbc', key, 
'\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0');

console.log(cipher.update(message, 'base64', 'utf8') + 
cipher.final('utf8'));

// outputs: yolo

Although you should also really use a better IV too :-)

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