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

Magma cipher implementation in pure TypeScript

import { xor } from "@li0ard/gost3413/dist/utils.js";
import { BLOCK_SIZE, keySequences, Magma, sboxes } from "../index.js";
import { mac as mac_, pad1 } from "@li0ard/gost3413";
/**
 * Compute MAC with Magma cipher (GOST 28147-89)
 * @param key Encryption key
 * @param data Input data
 * @param iv Initialization vector
 * @param sbox Optional substitution box, defaults to `ID_GOST_28147_89_CRYPTO_PRO_A_PARAM_SET`
 */
export const mac_legacy = (key, data, iv = new Uint8Array(BLOCK_SIZE), sbox = sboxes.ID_GOST_28147_89_CRYPTO_PRO_A_PARAM_SET) => {
    const split = (data) => [
        (data[0] | data[1] << 8 | data[2] << 16 | data[3] << 24) >>> 0,
        (data[4] | data[5] << 8 | data[6] << 16 | data[7] << 24) >>> 0
    ];
    const join = (ns) => new Uint8Array([
        (ns[1] >> 0) & 0xFF, (ns[1] >> 8) & 0xFF, (ns[1] >> 16) & 0xFF, (ns[1] >> 24) & 0xFF,
        (ns[0] >> 0) & 0xFF, (ns[0] >> 8) & 0xFF, (ns[0] >> 16) & 0xFF, (ns[0] >> 24) & 0xFF
    ]);
    const cipher = new Magma(Magma.reverseKey(key), sbox);
    cipher.regenerateRoundKeys(keySequences.MAC);
    const paddedData = pad1(data, BLOCK_SIZE);
    let prev = split(iv).reverse();
    for (let i = 0; i < paddedData.length; i += BLOCK_SIZE)
        prev = split(Magma.reverseChunks(cipher.proceedBlock(Magma.reverseChunks(xor(paddedData.slice(i, i + BLOCK_SIZE), join(prev))), keySequences.MAC)));
    return join(prev);
};
/**
 * Compute MAC with Magma cipher
 * @param key Encryption key
 * @param data Input data
 * @param sbox Optional substitution box, defaults to `ID_TC26_GOST_28147_PARAM_Z`
 */
export const mac = (key, data, sbox = sboxes.ID_TC26_GOST_28147_PARAM_Z) => {
    const cipher = new Magma(key, sbox);
    return mac_(cipher.encryptBlock.bind(cipher), BLOCK_SIZE, data);
};