On 8 October 2012 15:48, James Coglan <[email protected]> wrote:
> I'm trying to implement a crypto system, and want to make sure I'm doing
> something portable, i.e. the ciphertexts I generate can be understood by
> any language with openssl functionality. I have a Ruby program that uses
> AES-256-CBC to encrypt some data, and I want to make sure I can generate
> the same ciphertext using Node.
>
> What mode of operation does crypto.createCipher('aes256') use? I assume
> it's not a bare AES function since it can encrypt arbitrary amounts of
> data, so it must be using a construction like CBC or CTR. Which one does it
> use, and can it be changed by the user?
>
To partially answer my own question: 'aes-256-cbc' is an allowed mode.
There are other modes available according to `openssl enc --help` but not
all of them work in Node.
If you want to set the IV used, you need to use crypto.createCipheriv().
For aes-256-cbc, the key must be 32 bytes, the IV 16. e.g.:
var crypto = require('crypto'),
key = '2ea5074bcc33ccbd1cd99341b837fcb4',
iv = '0123456789abcdef',
aes = crypto.createCipheriv('aes-256-cbc', key, iv);
var cipher = aes.update('The Text', 'utf8', 'hex') + aes.final('hex');
console.log(cipher);
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