petcrypt-js-lite/dist/crypto/cipher.js

Universal sdk for PET functionalities

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Cipher = void 0;
const crypto = require('crypto');
const EC = require('elliptic').ec;
const ec = new EC('curve25519');
class Cipher {
    constructor() {
        this.keypair = ec.genKeyPair();
        this.aesKey = Buffer.alloc(0);
    }
    isAesKeySet() {
        return this.aesKey == Buffer.alloc(0);
    }
    getPublicKey() {
        return Buffer.from(this.keypair.getPublic().encode('array', false)).reverse();
    }
    deriveShareSecret(publicKey) {
        const pubKey = ec.keyFromPublic(publicKey.reverse());
        let sharedSecret = this.keypair.derive(pubKey.getPublic());
        if (typeof globalThis !== 'undefined' && typeof globalThis.window !== 'undefined') {
            sharedSecret = sharedSecret.toArray().reverse();
        }
        else {
            sharedSecret = Buffer.from(sharedSecret.toArray()).reverse();
        }
        this.aesKey = crypto.createHash('sha256').update(sharedSecret).digest();
    }
    async aesEncrypt(data, type) {
        const iv = crypto.randomBytes(16);
        const cipher = crypto.createCipheriv('aes-256-cbc', this.aesKey, iv);
        let encryptedData = cipher.update(data);
        encryptedData = Buffer.concat([encryptedData, cipher.final()]);
        return Buffer.from(JSON.stringify({
            iv: Array.from(iv),
            data: Array.from(encryptedData),
            data_type: Array.from([type])
        }));
    }
}
exports.Cipher = Cipher;
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