@hashgraph/cryptography/src/primitive/aes.js

Cryptographic utilities and primitives for the Hiero SDK

import crypto from "crypto";
import * as hex from "../encoding/hex.js";

export const CipherAlgorithm = {
    Aes128Ctr: "AES-128-CTR",
    Aes128Cbc: "AES-128-CBC",
};

/**
 * @param {string} algorithm
 * @param {Uint8Array} key
 * @param {Uint8Array} iv
 * @param {Uint8Array} data
 * @returns {Promise<Uint8Array>}
 */
export function createCipheriv(algorithm, key, iv, data) {
    const cipher = crypto.createCipheriv(algorithm, key.slice(0, 16), iv);

    return Promise.resolve(
        Buffer.concat([cipher.update(data), cipher["final"]()]),
    );
}

/**
 * @param {string} algorithm
 * @param {Uint8Array} key
 * @param {Uint8Array} iv
 * @param {Uint8Array} data
 * @returns {Promise<Uint8Array>}
 */
export function createDecipheriv(algorithm, key, iv, data) {
    const decipher = crypto.createDecipheriv(algorithm, key.slice(0, 16), iv);

    return Promise.resolve(
        Buffer.concat([decipher.update(data), decipher["final"]()]),
    );
}

/**
 * @param {string} passphrase
 * @param {string} iv
 * @returns {Promise<Uint8Array>}
 */
export function messageDigest(passphrase, iv) {
    return Promise.resolve(
        crypto
            .createHash("md5")
            .update(passphrase)
            .update(hex.decode(iv).slice(0, 8))
            .digest(),
    );
}