I'm writing a system, where a user can write something (via. mobile browser), and that "String" will be encrypted with a password, chosen by the user. Since unicode emojis are often used, they have to be supported too.

As lib for the crypto, I choose CryptoJs - so that the crypto can be done local on the devices.

Currently, when I encrypt a string, and decrypt the same sting, all emojis disappear/ are replaced with random chars.

var key = "123";
var content = "secret text with an emoji,