mirror of https://github.com/gchq/CyberChef.git
125 lines
2.5 KiB
JavaScript
125 lines
2.5 KiB
JavaScript
/**
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* Bitwise operation resources.
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*
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2018
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* @license Apache-2.0
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*/
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/**
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* Runs bitwise operations across the input data.
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*
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* @param {byteArray|Uint8Array} input
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* @param {byteArray} key
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* @param {function} func - The bitwise calculation to carry out
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* @param {boolean} nullPreserving
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* @param {string} scheme
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* @returns {byteArray}
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*/
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export function bitOp (input, key, func, nullPreserving, scheme) {
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if (!key || !key.length) key = [0];
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const result = [];
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let x = null,
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k = null,
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o = null;
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for (let i = 0; i < input.length; i++) {
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k = key[i % key.length];
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if (scheme === "Cascade") k = input[i + 1] || 0;
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o = input[i];
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x = nullPreserving && (o === 0 || o === k) ? o : func(o, k);
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result.push(x);
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if (scheme &&
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scheme !== "Standard" &&
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!(nullPreserving && (o === 0 || o === k))) {
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switch (scheme) {
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case "Input differential":
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key[i % key.length] = o;
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break;
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case "Output differential":
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key[i % key.length] = x;
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break;
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}
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}
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}
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return result;
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}
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/**
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* XOR bitwise calculation.
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*
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* @param {number} operand
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* @param {number} key
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* @returns {number}
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*/
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export function xor(operand, key) {
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return operand ^ key;
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}
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/**
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* NOT bitwise calculation.
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*
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* @param {number} operand
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* @returns {number}
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*/
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export function not(operand, _) {
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return ~operand & 0xff;
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}
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/**
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* AND bitwise calculation.
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*
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* @param {number} operand
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* @param {number} key
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* @returns {number}
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*/
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export function and(operand, key) {
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return operand & key;
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}
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/**
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* OR bitwise calculation.
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*
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* @param {number} operand
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* @param {number} key
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* @returns {number}
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*/
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export function or(operand, key) {
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return operand | key;
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}
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/**
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* ADD bitwise calculation.
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*
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* @param {number} operand
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* @param {number} key
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* @returns {number}
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*/
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export function add(operand, key) {
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return (operand + key) % 256;
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}
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/**
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* SUB bitwise calculation.
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*
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* @param {number} operand
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* @param {number} key
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* @returns {number}
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*/
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export function sub(operand, key) {
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const result = operand - key;
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return (result < 0) ? 256 + result : result;
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}
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/**
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* Delimiter options for bitwise operations
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*/
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export const BITWISE_OP_DELIMS = ["Hex", "Decimal", "Binary", "Base64", "UTF8", "Latin1"];
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