How to encrypt using PHP mcrypt and decrypt with node crypto

Question

I have some PHP code that produces some ciphertext as follows:

<?php
$data = '12345678123456781234567812345678123456781234567812345678123456781234567812345678';

$ciphertext = mcrypt_encrypt('rijndael-128', 'M02cnQ51Ji97vwT4', $data, 'ecb');

echo base64_encode($ciphertext);
?>

Produces:

6tJ67oaF1X12X/FE4ahLdOrSeu6GhdV9dl/xROGoS3Tq0nruhoXVfXZf8UThqEt06tJ67oaF1X12X/FE4ahLdOrSeu6GhdV9dl/xROGoS3Q=

I know that ECB is not the best mode to use in for this type of data, but I am not the one encrypting it.

The trouble I am having is with node-crypto trying to decrypt this. My node script is as follows:

var crypto = require("crypto");    

var data = "6tJ67oaF1X12X/FE4ahLdOrSeu6GhdV9dl/xROGoS3Tq0nruhoXVfXZf8UThqEt06tJ67oaF1X12X/FE4ahLdOrSeu6GhdV9dl/xROGoS3Q=";

var out = '';

var decipher = crypto.createDecipher("aes-256-ecb", "M02cnQ51Ji97vwT4");

decipher.setAutoPadding(false); //this needs to be set otherwise i get an error:06065064:bad decrypt

out += decipher.update(data, "base64", "ascii");

out += decipher.final("ascii");

console.log(out);

Produces:

"3i<1pzV7A

      vnE"3i<1pzV7A

                   vnE"3i<1pzV7A

                                vnE"3i<1pzV7A

                                             vnE"3i<1pzV7A

                                                          vnE

I can't tell what has gone wrong here, the repeating pattern of the original data is recovered but it is not correct. I have had trouble finding what equivalent "rijndael-128" has in openssl, and it seems that it must be 'aes-256-ecb', and an IV isn't needed as it is ECB. How can I get these two libraries to work together?

Thanks, J

tugrul · Accepted Answer · 2013-09-23 17:33:20Z

1

https://github.com/tugrul/node-mcrypt

var mcrypt = require('mcrypt');

var bfEcb = new mcrypt.MCrypt('rijndael-128', 'ecb');
bfEcb.open('M02cnQ51Ji97vwT4');

var ciphertext = new Buffer('6tJ67oaF1X12X/FE4ahLdOrSeu6GhdV9dl/xROGoS3Tq0nruhoXVfXZf8UThqEt06tJ67oaF1X12X/FE4ahLdOrSeu6GhdV9dl/xROGoS3Q=', 'base64');
var plaintext = bfEcb.decrypt(ciphertext);
console.log(plaintext.toString());

answered Sep 23, 2013 at 17:33

tugrul

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tomekK · Accepted Answer · 2013-11-05 11:16:43Z

1

Try this:

var crypto = require("crypto");    
var data = "6tJ67oaF1X12X/FE4ahLdOrSeu6GhdV9dl/xROGoS3Tq0nruhoXVfXZf8UThqEt06tJ67oaF1X12X/FE4ahLdOrSeu6GhdV9dl/xROGoS3Q=";

var out = '';

var decipher = crypto.createDecipheriv("aes-256-ecb", "M02cnQ51Ji97vwT4", '');
out += decipher.update(data, "base64");
out += decipher.final();

console.log(out);

Changing createDecipher(...) to createDecipheriv (notice iv at the end) with empty third parameter (so called initialization vector) do the trick in my case. And in this case remove setAutoPadding(false).

answered Nov 5, 2013 at 11:16

tomekK

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