const crypto = require('crypto');

function encrypt(payload, key, secret_iv, algorithm) {
    try {
        const iv = crypto
            .createHash('sha512')
            .update(secret_iv)
            .digest('hex')
            .substring(0, 16)
        const cipher = crypto.createCipheriv(algorithm, crypto
            .createHash('sha512')
            .update(key)
            .digest('hex')
            .substring(0, 32), iv);
        let encrypted = cipher.update(payload, 'binary', 'binary');
        encrypted += cipher.final('binary');
        return Buffer.from(encrypted, 'binary');
    } catch (error) {
        return Buffer.from('');
    }
}

function decrypt(payload, key, secret_iv, algorithm) {
    try {
        const iv = crypto
            .createHash('sha512')
            .update(secret_iv)
            .digest('hex')
            .substring(0, 16)
        const decipher = crypto.createDecipheriv(algorithm, crypto
            .createHash('sha512')
            .update(key)
            .digest('hex')
            .substring(0, 32), iv);
        let decrypted = decipher.update(payload, 'binary', 'binary');
        decrypted += decipher.final('binary');
        return Buffer.from(decrypted, 'binary');
    } catch (error) {
        return Buffer.from('');
    }
}

module.exports = {
    encrypt, decrypt
};