rijndael-js | Pure JS implementation of Rijndael algorithm | Learning library

Concerning your key you have to convert your hex-string into binary data using a buffer (see e.g. Encrypt binary data with aes-ecb on node.js).

Moreover, you have to use the method crypto.createCipheriv to instantiate the cipher (see e.g. https://nodejs.org/api/crypto.html#crypto_crypto_createcipheriv_algorithm_key_iv_options). The currently used (deprecated) method crypto.creataCipher expects a password and generates the key from the password (see e.g. https://nodejs.org/api/crypto.html#crypto_crypto_createcipher_algorithm_password_options).

The following code