AES encrypt in Node.js Decrypt in PHP. Fail.

Question

In node.js, I use the build in function to encrypt data like that:

var text = \"Yes\";
var password = \"123456\";
var encrypt = crypto.createCipher(\'aes-256         


        

Answer 1

If you're stuck with a third-party library which uses MCRYPT_RIJNDAEL_256, know that the 256 specifies the block size, not the key size. AES uses a fixed block-size of 128 bits, and openssl does not implement more generic Rijndael algorithms. To circumvent this I published a module that binds to libmcrypt, just as PHP does. It's a pretty limited use-case, but it ensures it will be compatible with 256-bit block size rijndael.

If you're using this in PHP

mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $plaintext, MCRYPT_MODE_ECB);
mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $ciphertext, MCRYPT_MODE_ECB);

You can do the same in Node:

var rijndael = require('node-rijndael');

// straight through (must be buffers)
rijndael.encrypt(plaintext, key);
rijndael.decrypt(ciphertext, key);

// or bound (can take a string for the key and an encoding)
var rijn = rijndael(key);
rijn.encrypt(plaintext); // gotta be a buffer again for implementation simplicity
rijn.decrypt(ciphertext);

node-rijndael on GitHub

node-rijndael on npm