CyberChef/src/core/operations/BaconCipherDecode.mjs

/**
 * BaconCipher operation.
 *
* @author kassi [kassi@users.noreply.github.com]
* @copyright Karsten Silkenbäumer 2019
* @license Apache-2.0
*/

import Operation from "../Operation";
import {
    BACON_ALPHABET_REDUCED, BACON_ALPHABET_COMPLETE,
    BACON_TRANSLATION_CASE, BACON_TRANSLATION_AMNZ, BACON_TRANSLATIONS, BACON_CLEARER_MAP, BACON_NORMALIZE_MAP,
    swapZeroAndOne
} from "../lib/Bacon";

/**
* BaconCipherDecode operation
*/
class BaconCipherDecode extends Operation {
    /**
    * BaconCipherDecode constructor
    */
    constructor() {
        super();

        this.name = "Bacon Cipher Decode";
        this.module = "Default";
        this.description = "Bacon's cipher or the Baconian cipher is a method of steganography(a method of hiding a secret message as opposed to just a cipher) devised by Francis Bacon in 1605.[1][2][3] A message is concealed in the presentation of text, rather than its content.";
        this.infoURL = "https://en.wikipedia.org/wiki/Bacon%27s_cipher";
        this.inputType = "string";
        this.outputType = "string";
        this.args = [
            {
                "name": "Alphabet",
                "type": "option",
                "value": [BACON_ALPHABET_REDUCED, BACON_ALPHABET_COMPLETE]
            },
            {
                "name": "Translation",
                "type": "option",
                "value": BACON_TRANSLATIONS
            },
            {
                "name": "Invert Translation",
                "type": "boolean",
                "value": false
            }
        ];
    }

    /**
    * @param {String} input
    * @param {Object[]} args
    * @returns {String}
    */
    run(input, args) {
        const [alphabet, translation, invert] = args;
        // split text into groups of 5 characters

        // remove invalid characters
        input = input.replace(BACON_CLEARER_MAP[translation], "");
        // normalize to unique alphabet
        if (BACON_NORMALIZE_MAP[translation] !== undefined) {
            input = input.replace(/./g, function (c) {
                return BACON_NORMALIZE_MAP[translation][c];
            });
        } else if (translation === BACON_TRANSLATION_CASE) {
            const codeA = "A".charCodeAt(0);
            const codeZ = "Z".charCodeAt(0);
            input = input.replace(/./g, function (c) {
                const code = c.charCodeAt(0);
                if (code >= codeA && code <= codeZ) {
                    return "1";
                } else {
                    return "0";
                }
            });
        } else if (translation === BACON_TRANSLATION_AMNZ) {
            const words = input.split(" ");
            const letters = words.map(function (e) {
                const code = e[0].toUpperCase().charCodeAt(0);
                return code >= "N".charCodeAt(0) ? "1" : "0";
            });
            input = letters.join("");
        }

        if (invert) {
            input = swapZeroAndOne(input);
        }

        // group into 5
        const inputArray = input.match(/(.{5})/g) || [];

        let output = "";
        for (let index = 0; index < inputArray.length; index++) {
            const code = inputArray[index];
            const number = parseInt(code, 2);
            output += number < alphabet.length ? alphabet[number] : "?";
        }
        return output;
    }
}

export default BaconCipherDecode;