OpenAuth_server/src/helper/user_key.ts

// import * as crypto from "crypto-js"
import { IUser } from "../models/user";
import { IClient } from "../models/client";
import * as crypto from "crypto";

function sha512(text: string) {
   let hash = crypto.createHash("sha512");
   hash.update(text);
   return hash.digest("base64");
}

export function getEncryptionKey(user: IUser, client: IClient) {
   return sha512(
      sha512(user.encryption_key) +
         sha512(client._id.toHexString()) +
         sha512(client.client_id)
   );
}