gistfile1.txt

const crypto = require("crypto");
const algorithm = "aes-256-gcm";

const encrypt = (data, key) => {
    const iv = crypto.randomBytes(16);
    let cipher = crypto.createCipheriv(algorithm, key, iv);
    let encrypted = cipher.update(JSON.stringify(data), "utf8", "hex");
    encrypted += cipher.final("hex");
    const tag = cipher.getAuthTag();
    return { content: encrypted, tag, iv };
};

const decrypt = (encrypted, key) => {
    const iv = Buffer.from(encrypted.iv.data);
    const tag = Buffer.from(encrypted.tag.data);
    let decipher = crypto.createDecipheriv(algorithm, key, iv);
    decipher.setAuthTag(tag);
    let dec = decipher.update(encrypted.content, "hex", "utf8");
    dec += decipher.final("utf8");
    dec = JSON.parse(dec);
    return dec;
};