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ESM: Added remaining Base64 ops and created a Base64 library. Added the prefer-const eslint rule.
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n1474335
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30 changed files with 986 additions and 825 deletions
162
src/core/operations/ShowBase64Offsets.mjs
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162
src/core/operations/ShowBase64Offsets.mjs
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/**
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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* @license Apache-2.0
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*/
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import Operation from "../Operation";
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import Utils from "../Utils";
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import {fromBase64, toBase64} from "../lib/Base64";
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/**
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* Show Base64 offsets operation
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*/
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class ShowBase64Offsets extends Operation {
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/**
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* ShowBase64Offsets constructor
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*/
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constructor() {
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super();
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this.name = "Show Base64 offsets";
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this.module = "Default";
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this.description = "When a string is within a block of data and the whole block is Base64'd, the string itself could be represented in Base64 in three distinct ways depending on its offset within the block.<br><br>This operation shows all possible offsets for a given string so that each possible encoding can be considered.";
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this.inputType = "byteArray";
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this.outputType = "html";
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this.args = [
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{
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name: "Alphabet",
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type: "binaryString",
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value: "A-Za-z0-9+/="
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},
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{
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name: "Show variable chars and padding",
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type: "boolean",
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value: true
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}
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];
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}
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/**
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* @param {byteArray} input
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* @param {Object[]} args
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* @returns {html}
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*/
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run(input, args) {
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const [alphabet, showVariable] = args;
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let offset0 = toBase64(input, alphabet),
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offset1 = toBase64([0].concat(input), alphabet),
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offset2 = toBase64([0, 0].concat(input), alphabet),
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staticSection = "",
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padding = "";
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const len0 = offset0.indexOf("="),
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len1 = offset1.indexOf("="),
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len2 = offset2.indexOf("="),
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script = "<script type='application/javascript'>$('[data-toggle=\"tooltip\"]').tooltip()</script>";
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if (input.length < 1) {
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return "Please enter a string.";
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}
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// Highlight offset 0
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if (len0 % 4 === 2) {
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staticSection = offset0.slice(0, -3);
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offset0 = "<span data-toggle='tooltip' data-placement='top' title='" +
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Utils.escapeHtml(fromBase64(staticSection, alphabet).slice(0, -2)) + "'>" +
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staticSection + "</span>" +
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"<span class='hl5'>" + offset0.substr(offset0.length - 3, 1) + "</span>" +
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"<span class='hl3'>" + offset0.substr(offset0.length - 2) + "</span>";
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} else if (len0 % 4 === 3) {
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staticSection = offset0.slice(0, -2);
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offset0 = "<span data-toggle='tooltip' data-placement='top' title='" +
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Utils.escapeHtml(fromBase64(staticSection, alphabet).slice(0, -1)) + "'>" +
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staticSection + "</span>" +
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"<span class='hl5'>" + offset0.substr(offset0.length - 2, 1) + "</span>" +
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"<span class='hl3'>" + offset0.substr(offset0.length - 1) + "</span>";
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} else {
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staticSection = offset0;
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offset0 = "<span data-toggle='tooltip' data-placement='top' title='" +
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Utils.escapeHtml(fromBase64(staticSection, alphabet)) + "'>" +
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staticSection + "</span>";
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}
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if (!showVariable) {
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offset0 = staticSection;
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}
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// Highlight offset 1
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padding = "<span class='hl3'>" + offset1.substr(0, 1) + "</span>" +
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"<span class='hl5'>" + offset1.substr(1, 1) + "</span>";
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offset1 = offset1.substr(2);
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if (len1 % 4 === 2) {
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staticSection = offset1.slice(0, -3);
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offset1 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
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Utils.escapeHtml(fromBase64("AA" + staticSection, alphabet).slice(1, -2)) + "'>" +
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staticSection + "</span>" +
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"<span class='hl5'>" + offset1.substr(offset1.length - 3, 1) + "</span>" +
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"<span class='hl3'>" + offset1.substr(offset1.length - 2) + "</span>";
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} else if (len1 % 4 === 3) {
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staticSection = offset1.slice(0, -2);
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offset1 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
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Utils.escapeHtml(fromBase64("AA" + staticSection, alphabet).slice(1, -1)) + "'>" +
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staticSection + "</span>" +
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"<span class='hl5'>" + offset1.substr(offset1.length - 2, 1) + "</span>" +
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"<span class='hl3'>" + offset1.substr(offset1.length - 1) + "</span>";
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} else {
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staticSection = offset1;
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offset1 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
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Utils.escapeHtml(fromBase64("AA" + staticSection, alphabet).slice(1)) + "'>" +
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staticSection + "</span>";
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}
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if (!showVariable) {
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offset1 = staticSection;
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}
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// Highlight offset 2
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padding = "<span class='hl3'>" + offset2.substr(0, 2) + "</span>" +
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"<span class='hl5'>" + offset2.substr(2, 1) + "</span>";
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offset2 = offset2.substr(3);
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if (len2 % 4 === 2) {
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staticSection = offset2.slice(0, -3);
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offset2 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
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Utils.escapeHtml(fromBase64("AAA" + staticSection, alphabet).slice(2, -2)) + "'>" +
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staticSection + "</span>" +
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"<span class='hl5'>" + offset2.substr(offset2.length - 3, 1) + "</span>" +
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"<span class='hl3'>" + offset2.substr(offset2.length - 2) + "</span>";
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} else if (len2 % 4 === 3) {
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staticSection = offset2.slice(0, -2);
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offset2 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
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Utils.escapeHtml(fromBase64("AAA" + staticSection, alphabet).slice(2, -2)) + "'>" +
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staticSection + "</span>" +
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"<span class='hl5'>" + offset2.substr(offset2.length - 2, 1) + "</span>" +
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"<span class='hl3'>" + offset2.substr(offset2.length - 1) + "</span>";
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} else {
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staticSection = offset2;
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offset2 = padding + "<span data-toggle='tooltip' data-placement='top' title='" +
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Utils.escapeHtml(fromBase64("AAA" + staticSection, alphabet).slice(2)) + "'>" +
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staticSection + "</span>";
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}
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if (!showVariable) {
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offset2 = staticSection;
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}
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return (showVariable ? "Characters highlighted in <span class='hl5'>green</span> could change if the input is surrounded by more data." +
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"\nCharacters highlighted in <span class='hl3'>red</span> are for padding purposes only." +
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"\nUnhighlighted characters are <span data-toggle='tooltip' data-placement='top' title='Tooltip on left'>static</span>." +
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"\nHover over the static sections to see what they decode to on their own.\n" +
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"\nOffset 0: " + offset0 +
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"\nOffset 1: " + offset1 +
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"\nOffset 2: " + offset2 +
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script :
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offset0 + "\n" + offset1 + "\n" + offset2);
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}
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}
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export default ShowBase64Offsets;
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