mirror of https://github.com/gchq/CyberChef.git
86 lines
2.5 KiB
JavaScript
86 lines
2.5 KiB
JavaScript
/**
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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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/**
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* To Base32 operation
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*/
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class ToBase32 extends Operation {
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/**
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* ToBase32 constructor
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*/
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constructor() {
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super();
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this.name = "To Base32";
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this.module = "Default";
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this.description = "Base32 is a notation for encoding arbitrary byte data using a restricted set of symbols that can be conveniently used by humans and processed by computers. It uses a smaller set of characters than Base64, usually the uppercase alphabet and the numbers 2 to 7.";
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this.inputType = "byteArray";
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this.outputType = "string";
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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-Z2-7="
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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 {string}
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*/
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run(input, args) {
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if (!input) return "";
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const alphabet = args[0] ? Utils.expandAlphRange(args[0]).join("") : "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=";
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let output = "",
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chr1, chr2, chr3, chr4, chr5,
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enc1, enc2, enc3, enc4, enc5, enc6, enc7, enc8,
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i = 0;
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while (i < input.length) {
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chr1 = input[i++];
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chr2 = input[i++];
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chr3 = input[i++];
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chr4 = input[i++];
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chr5 = input[i++];
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enc1 = chr1 >> 3;
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enc2 = ((chr1 & 7) << 2) | (chr2 >> 6);
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enc3 = (chr2 >> 1) & 31;
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enc4 = ((chr2 & 1) << 4) | (chr3 >> 4);
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enc5 = ((chr3 & 15) << 1) | (chr4 >> 7);
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enc6 = (chr4 >> 2) & 31;
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enc7 = ((chr4 & 3) << 3) | (chr5 >> 5);
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enc8 = chr5 & 31;
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if (isNaN(chr2)) {
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enc3 = enc4 = enc5 = enc6 = enc7 = enc8 = 32;
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} else if (isNaN(chr3)) {
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enc5 = enc6 = enc7 = enc8 = 32;
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} else if (isNaN(chr4)) {
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enc6 = enc7 = enc8 = 32;
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} else if (isNaN(chr5)) {
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enc8 = 32;
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}
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output += alphabet.charAt(enc1) + alphabet.charAt(enc2) + alphabet.charAt(enc3) +
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alphabet.charAt(enc4) + alphabet.charAt(enc5) + alphabet.charAt(enc6) +
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alphabet.charAt(enc7) + alphabet.charAt(enc8);
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}
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return output;
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}
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}
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export default ToBase32;
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