On Tue, Sep 11, 2012 at 9:42 AM, Paulina Budzoń
<paulina.bud...@gmail.com> wrote:
> Hello everyone,
>
> Recently I've upgraded my node to v0.8.8 and I encountered this strange
> error (I'm not sure if it was present in previous node versions, though).
> I have two functions for crypting and decrypting data in my application:
>
> var cc_key = fs.readFileSync(path_to_key_file);
>
> crypt = function(val){
> var c = crypto.createCipher('aes256', cc_key.toString());
> c.update(val, 'utf8');
> return c.final('hex')
> }
>
> decrypt = function(val){
> var c = crypto.createDecipher('aes256', cc_key.toString());
> c.update(val, 'hex');
> return c.final('utf8');
> }
>
> Both work just fine, unless I try to crypt and decrypt strings longer than
> 15 characters.
>
> For example, doing:
>
> var a = crypt("123456789012345");
> console.log(decrypt(a))
>
> works perfectly.
> But doing:
>
> var a = crypt("1234567890123456");
> --- in here a = "694e42d3af6bd12b6fb6d165ca702e30" - so it's not empty and
> seem to be ok ---
> console.log(decrypt(a));
>
> Throws: TypeError: DecipherFinal fail.
>
> I'm not sure if I'm doing something wrong or there is a bug in crypto module
> in node? I looked over the internet and it seems like a lot of people have
> similar problems, but no-one knows the answer why is this happening.
You need to concatenate the return values of update() and final(),
both when encrypting and decrypting.
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