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

Magma cipher implementation in pure TypeScript

import { BLOCK_SIZE, Magma, sboxes } from "../";
import { ofb } from "@li0ard/gost3413";
/**
 * Encrypts data using the Output Feedback (OFB) mode with Magma cipher.
 *
 * @param key Encryption key
 * @param data Data to be encrypted
 * @param iv Initialization vector
 * @param sbox Optional substitution box, defaults to `ID_TC26_GOST_28147_PARAM_Z`
 * @returns {Uint8Array}
 */
export const encryptOFB = (key, data, iv, sbox = sboxes.ID_TC26_GOST_28147_PARAM_Z) => {
    const cipher = new Magma(key, sbox);
    const encrypter = (buf) => cipher.encryptBlock(buf);
    return ofb(encrypter, BLOCK_SIZE, data, iv);
};
/**
 * Decrypts data using the Output Feedback (OFB) mode with Magma cipher.
 *
 * @param key Encryption key
 * @param data Data to be decrypted
 * @param iv Initialization vector
 * @param sbox Optional substitution box, defaults to `ID_TC26_GOST_28147_PARAM_Z`
 * @returns {Uint8Array}
 */
export const decryptOFB = encryptOFB;