@li0ard/magma/dist/modes/mgm.js

Magma cipher implementation in pure TypeScript

import { BLOCK_SIZE, Magma } from "../";
import { MGM } from "@li0ard/gost3413";
/**
 * Encrypts data using the Multilinear Galois Mode (MGM) with Magma cipher.
 * @param key Encryption key
 * @param data Data to be encrypted and authenticated
 * @param iv Initialization vector
 * @param additionalData Additional data to be authenticated
 */
export const encryptMGM = (key, data, iv, additionalData = new Uint8Array()) => {
    const cipher = new Magma(key);
    const encrypter = (buf) => cipher.encryptBlock(buf);
    let mgm = new MGM(encrypter, BLOCK_SIZE);
    return mgm.seal(iv.slice(), data.slice(), additionalData.slice());
};
/**
 * Decrypts data using the Multilinear Galois Mode (MGM) with Magma cipher.
 * @param key Encryption key
 * @param data Data to be decrypted and authenticated
 * @param iv Initialization vector
 * @param additionalData Additional data to be authenticated
 */
export const decryptMGM = (key, data, iv, additionalData = new Uint8Array()) => {
    const cipher = new Magma(key);
    const encrypter = (buf) => cipher.encryptBlock(buf);
    let mgm = new MGM(encrypter, BLOCK_SIZE);
    return mgm.open(iv.slice(), data.slice(), additionalData.slice());
};