@li0ard/streebog/dist/kdf.js

Streebog hash function in pure TypeScript

import { concatBytes, hexToBytes } from "@noble/hashes/utils.js";
import { Streebog256HMAC } from "./index.js";
import { numberToBytesBE } from "./utils.js";
/**
 * `KDF_GOSTR3411_2012_256`
 *
 * @param key Initial key
 * @param label Label
 * @param seed Seed
 */
export const kdf_gostr3411_2012_256 = (key, label, seed) => Streebog256HMAC(key).update(concatBytes(hexToBytes("01"), label, hexToBytes("00"), seed, hexToBytes("0100"))).digest();
// Also we can use:
// return kdf_tree_gostr3411_2012_256(key, label, seed, 1)[0]
/**
 * `KDF_TREE_GOSTR3411_2012_256`
 *
 * @param key Initial key
 * @param label Label
 * @param seed Seed
 * @param keys Number of generated keys
 * @param i_len Length of iterations value (`R`)
 */
export const kdf_tree_gostr3411_2012_256 = (key, label, seed, keys, i_len = 1) => {
    const keymat = [];
    const length = numberToBytesBE(BigInt(keys) * 32n * 8n, 1);
    for (let i = 0; i < keys; i++)
        keymat.push(Streebog256HMAC(key).update(concatBytes(numberToBytesBE(i + 1, i_len), label, hexToBytes("00"), seed, length)).digest());
    return keymat;
};