Merge pull request #1 from gchq/master

Merge from gchq

.cspell.json

@@ -0,0 +1,17 @@
+{
+    "version": "0.2",
+    "language": "en,en-gb",
+    "words": [],
+    "dictionaries": [
+      "npm",
+      "softwareTerms",
+      "node",
+      "html",
+      "css",
+      "bash",
+      "en-gb",
+      "misc"
+    ],
+    "ignorePaths": ["package.json", "package-lock.json", "node_modules"]
+  }
+  

package.json

@@ -61,6 +61,7 @@
     "compression-webpack-plugin": "^11.1.0",
     "copy-webpack-plugin": "^12.0.2",
     "core-js": "^3.37.1",
+    "cspell": "^8.17.3",
     "css-loader": "7.1.2",
     "eslint": "^9.4.0",
     "eslint-plugin-jsdoc": "^48.2.9",
@@ -160,7 +161,7 @@
     "notepack.io": "^3.0.1",
     "ntlm": "^0.1.3",
     "nwmatcher": "^1.4.4",
-    "otp": "0.1.3",
+    "otpauth": "9.3.6",
     "path": "^0.12.7",
     "popper.js": "^1.16.1",
     "process": "^0.11.10",
@@ -193,6 +194,7 @@
     "testui": "npx grunt testui",
     "testuidev": "npx nightwatch --env=dev",
     "lint": "npx grunt lint",
+    "lint:grammar": "cspell ./src",
     "postinstall": "npx grunt exec:fixCryptoApiImports && npx grunt exec:fixSnackbarMarkup && npx grunt exec:fixJimpModule",
     "newop": "node --experimental-modules --experimental-json-modules src/core/config/scripts/newOperation.mjs",
     "minor": "node --experimental-modules --experimental-json-modules src/core/config/scripts/newMinorVersion.mjs",

src/core/config/Categories.json

@@ -74,7 +74,10 @@
             "CBOR Decode",
             "Caret/M-decode",
             "Rison Encode",
-            "Rison Decode"
+            "Rison Decode",
+            "To Modhex",
+            "From Modhex",
+            "MIME Decoding"
         ]
     },
     {
@@ -274,7 +277,8 @@
             "Unicode Text Format",
             "Remove Diacritics",
             "Unescape Unicode Characters",
-            "Convert to NATO alphabet"
+            "Convert to NATO alphabet",
+            "Convert Leet Speak"
         ]
     },
     {

src/core/lib/Extract.mjs

@@ -62,3 +62,9 @@ export const URL_REGEX = new RegExp(protocol + hostname + "(?:" + port + ")?(?:"
  * Domain name regular expression
  */
 export const DOMAIN_REGEX = /\b((?=[a-z0-9-]{1,63}\.)(xn--)?[a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,63}\b/ig;
+
+
+/**
+ * DMARC Domain name regular expression
+ */
+export const DMARC_DOMAIN_REGEX = /\b((?=[a-z0-9_-]{1,63}\.)(xn--)?[a-z0-9_]+(-[a-z0-9_]+)*\.)+[a-z]{2,63}\b/ig;

src/core/lib/Modhex.mjs

@@ -0,0 +1,165 @@
+/**
+ * @author linuxgemini [ilteris@asenkron.com.tr]
+ * @copyright Crown Copyright 2024
+ * @license Apache-2.0
+ */
+
+import Utils from "../Utils.mjs";
+import OperationError from "../errors/OperationError.mjs";
+import { fromHex, toHex } from "./Hex.mjs";
+
+/**
+ * Modhex alphabet.
+ */
+const MODHEX_ALPHABET = "cbdefghijklnrtuv";
+
+
+/**
+ * Modhex alphabet map.
+ */
+const MODHEX_ALPHABET_MAP = MODHEX_ALPHABET.split("");
+
+
+/**
+ * Hex alphabet to substitute Modhex.
+ */
+const HEX_ALPHABET = "0123456789abcdef";
+
+
+/**
+ * Hex alphabet map to substitute Modhex.
+ */
+const HEX_ALPHABET_MAP = HEX_ALPHABET.split("");
+
+
+/**
+ * Convert a byte array into a modhex string.
+ *
+ * @param {byteArray|Uint8Array|ArrayBuffer} data
+ * @param {string} [delim=" "]
+ * @param {number} [padding=2]
+ * @returns {string}
+ *
+ * @example
+ * // returns "cl bf bu"
+ * toModhex([10,20,30]);
+ *
+ * // returns "cl:bf:bu"
+ * toModhex([10,20,30], ":");
+ */
+export function toModhex(data, delim=" ", padding=2, extraDelim="", lineSize=0) {
+    if (!data) return "";
+    if (data instanceof ArrayBuffer) data = new Uint8Array(data);
+
+    const regularHexString = toHex(data, "", padding, "", 0);
+
+    let modhexString = "";
+    for (const letter of regularHexString.split("")) {
+        modhexString += MODHEX_ALPHABET_MAP[HEX_ALPHABET_MAP.indexOf(letter)];
+    }
+
+    let output = "";
+    const groupingRegexp = new RegExp(`.{1,${padding}}`, "g");
+    const groupedModhex = modhexString.match(groupingRegexp);
+
+    for (let i = 0; i < groupedModhex.length; i++) {
+        const group = groupedModhex[i];
+        output += group + delim;
+
+        if (extraDelim) {
+            output += extraDelim;
+        }
+        // Add LF after each lineSize amount of bytes but not at the end
+        if ((i !== groupedModhex.length - 1) && ((i + 1) % lineSize === 0)) {
+            output += "\n";
+        }
+    }
+
+    // Remove the extraDelim at the end (if there is one)
+    // and remove the delim at the end, but if it's prepended there's nothing to remove
+    const rTruncLen = extraDelim.length + delim.length;
+    if (rTruncLen) {
+        // If rTruncLen === 0 then output.slice(0,0) will be returned, which is nothing
+        return output.slice(0, -rTruncLen);
+    } else {
+        return output;
+    }
+}
+
+
+/**
+ * Convert a byte array into a modhex string as efficiently as possible with no options.
+ *
+ * @param {byteArray|Uint8Array|ArrayBuffer} data
+ * @returns {string}
+ *
+ * @example
+ * // returns "clbfbu"
+ * toModhexFast([10,20,30]);
+ */
+export function toModhexFast(data) {
+    if (!data) return "";
+    if (data instanceof ArrayBuffer) data = new Uint8Array(data);
+
+    const output = [];
+
+    for (let i = 0; i < data.length; i++) {
+        output.push(MODHEX_ALPHABET_MAP[(data[i] >> 4) & 0xf]);
+        output.push(MODHEX_ALPHABET_MAP[data[i] & 0xf]);
+    }
+    return output.join("");
+}
+
+
+/**
+ * Convert a modhex string into a byte array.
+ *
+ * @param {string} data
+ * @param {string} [delim]
+ * @param {number} [byteLen=2]
+ * @returns {byteArray}
+ *
+ * @example
+ * // returns [10,20,30]
+ * fromModhex("cl bf bu");
+ *
+ * // returns [10,20,30]
+ * fromModhex("cl:bf:bu", "Colon");
+ */
+export function fromModhex(data, delim="Auto", byteLen=2) {
+    if (byteLen < 1 || Math.round(byteLen) !== byteLen)
+        throw new OperationError("Byte length must be a positive integer");
+
+    // The `.replace(/\s/g, "")` an interesting workaround: Hex "multiline" tests aren't actually
+    // multiline. Tests for Modhex fixes that, thus exposing the issue.
+    data = data.toLowerCase().replace(/\s/g, "");
+
+    if (delim !== "None") {
+        const delimRegex = delim === "Auto" ? /[^cbdefghijklnrtuv]/gi : Utils.regexRep(delim);
+        data = data.split(delimRegex);
+    } else {
+        data = [data];
+    }
+
+    let regularHexString = "";
+    for (let i = 0; i < data.length; i++) {
+        for (const letter of data[i].split("")) {
+            regularHexString += HEX_ALPHABET_MAP[MODHEX_ALPHABET_MAP.indexOf(letter)];
+        }
+    }
+
+    const output = fromHex(regularHexString, "None", byteLen);
+    return output;
+}
+
+
+/**
+ * To Modhex delimiters.
+ */
+export const TO_MODHEX_DELIM_OPTIONS = ["Space", "Percent", "Comma", "Semi-colon", "Colon", "Line feed", "CRLF", "None"];
+
+
+/**
+ * From Modhex delimiters.
+ */
+export const FROM_MODHEX_DELIM_OPTIONS = ["Auto"].concat(TO_MODHEX_DELIM_OPTIONS);

src/core/operations/ConvertLeetSpeak.mjs

@@ -0,0 +1,113 @@
+/**
+ * @author bartblaze []
+ * @copyright Crown Copyright 2025
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+
+/**
+ * Convert Leet Speak operation
+ */
+class ConvertLeetSpeak extends Operation {
+    /**
+     * ConvertLeetSpeak constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Convert Leet Speak";
+        this.module = "Default";
+        this.description = "Converts to and from Leet Speak";
+        this.infoURL = "https://wikipedia.org/wiki/Leet";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                name: "Direction",
+                type: "option",
+                value: ["To Leet Speak", "From Leet Speak"],
+                defaultIndex: 0
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const direction = args[0];
+        if (direction === "To Leet Speak") {
+            return input.replace(/[abcdefghijklmnopqrstuvwxyz]/gi, char => {
+                return toLeetMap[char.toLowerCase()] || char;
+            });
+        } else if (direction === "From Leet Speak") {
+            return input.replace(/[48cd3f6h1jklmn0pqr57uvwxyz]/g, char => {
+                return fromLeetMap[char] || char;
+            });
+        }
+    }
+}
+
+const toLeetMap = {
+    "a": "4",
+    "b": "b",
+    "c": "c",
+    "d": "d",
+    "e": "3",
+    "f": "f",
+    "g": "g",
+    "h": "h",
+    "i": "1",
+    "j": "j",
+    "k": "k",
+    "l": "l",
+    "m": "m",
+    "n": "n",
+    "o": "0",
+    "p": "p",
+    "q": "q",
+    "r": "r",
+    "s": "5",
+    "t": "7",
+    "u": "u",
+    "v": "v",
+    "w": "w",
+    "x": "x",
+    "y": "y",
+    "z": "z"
+};
+
+const fromLeetMap = {
+    "4": "a",
+    "b": "b",
+    "c": "c",
+    "d": "d",
+    "3": "e",
+    "f": "f",
+    "g": "g",
+    "h": "h",
+    "1": "i",
+    "j": "j",
+    "k": "k",
+    "l": "l",
+    "m": "m",
+    "n": "n",
+    "0": "o",
+    "p": "p",
+    "q": "q",
+    "r": "r",
+    "5": "s",
+    "7": "t",
+    "u": "u",
+    "v": "v",
+    "w": "w",
+    "x": "x",
+    "y": "y",
+    "z": "z"
+};
+
+export default ConvertLeetSpeak;
+

src/core/operations/DESDecrypt.mjs

@@ -22,7 +22,7 @@ class DESDecrypt extends Operation {
 
         this.name = "DES Decrypt";
         this.module = "Ciphers";
-        this.description = "DES is a previously dominant algorithm for encryption, and was published as an official U.S. Federal Information Processing Standard (FIPS). It is now considered to be insecure due to its small key size.<br><br><b>Key:</b> DES uses a key length of 8 bytes (64 bits).<br>Triple DES uses a key length of 24 bytes (192 bits).<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used as a default.";
+        this.description = "DES is a previously dominant algorithm for encryption, and was published as an official U.S. Federal Information Processing Standard (FIPS). It is now considered to be insecure due to its small key size.<br><br><b>Key:</b> DES uses a key length of 8 bytes (64 bits).<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used as a default.";
         this.infoURL = "https://wikipedia.org/wiki/Data_Encryption_Standard";
         this.inputType = "string";
         this.outputType = "string";
@@ -72,8 +72,7 @@ class DESDecrypt extends Operation {
         if (key.length !== 8) {
             throw new OperationError(`Invalid key length: ${key.length} bytes
 
-DES uses a key length of 8 bytes (64 bits).
+DES uses a key length of 8 bytes (64 bits).`);
-Triple DES uses a key length of 24 bytes (192 bits).`);
         }
         if (iv.length !== 8 && mode !== "ECB") {
             throw new OperationError(`Invalid IV length: ${iv.length} bytes

src/core/operations/DESEncrypt.mjs

@@ -22,7 +22,7 @@ class DESEncrypt extends Operation {
 
         this.name = "DES Encrypt";
         this.module = "Ciphers";
-        this.description = "DES is a previously dominant algorithm for encryption, and was published as an official U.S. Federal Information Processing Standard (FIPS). It is now considered to be insecure due to its small key size.<br><br><b>Key:</b> DES uses a key length of 8 bytes (64 bits).<br>Triple DES uses a key length of 24 bytes (192 bits).<br><br>You can generate a password-based key using one of the KDF operations.<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used.";
+        this.description = "DES is a previously dominant algorithm for encryption, and was published as an official U.S. Federal Information Processing Standard (FIPS). It is now considered to be insecure due to its small key size.<br><br><b>Key:</b> DES uses a key length of 8 bytes (64 bits).<br><br>You can generate a password-based key using one of the KDF operations.<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used.";
         this.infoURL = "https://wikipedia.org/wiki/Data_Encryption_Standard";
         this.inputType = "string";
         this.outputType = "string";
@@ -70,8 +70,7 @@ class DESEncrypt extends Operation {
         if (key.length !== 8) {
             throw new OperationError(`Invalid key length: ${key.length} bytes
 
-DES uses a key length of 8 bytes (64 bits).
+DES uses a key length of 8 bytes (64 bits).`);
-Triple DES uses a key length of 24 bytes (192 bits).`);
         }
         if (iv.length !== 8 && mode !== "ECB") {
             throw new OperationError(`Invalid IV length: ${iv.length} bytes

src/core/operations/ExtractDomains.mjs

@@ -5,7 +5,7 @@
  */
 
 import Operation from "../Operation.mjs";
-import { search, DOMAIN_REGEX } from "../lib/Extract.mjs";
+import { search, DOMAIN_REGEX, DMARC_DOMAIN_REGEX } from "../lib/Extract.mjs";
 import { caseInsensitiveSort } from "../lib/Sort.mjs";
 
 /**
@@ -39,6 +39,11 @@ class ExtractDomains extends Operation {
                 name: "Unique",
                 type: "boolean",
                 value: false
+            },
+            {
+                name: "Underscore (DMARC, DKIM, etc)",
+                type: "boolean",
+                value: false
             }
         ];
     }
@@ -49,11 +54,11 @@ class ExtractDomains extends Operation {
      * @returns {string}
      */
     run(input, args) {
-        const [displayTotal, sort, unique] = args;
+        const [displayTotal, sort, unique, dmarc] = args;
 
         const results = search(
             input,
-            DOMAIN_REGEX,
+            dmarc ? DMARC_DOMAIN_REGEX : DOMAIN_REGEX,
             null,
             sort ? caseInsensitiveSort : null,
             unique

src/core/operations/FromModhex.mjs

@@ -0,0 +1,84 @@
+/**
+ * @author linuxgemini [ilteris@asenkron.com.tr]
+ * @copyright Crown Copyright 2024
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import { FROM_MODHEX_DELIM_OPTIONS, fromModhex } from "../lib/Modhex.mjs";
+
+/**
+ * From Modhex operation
+ */
+class FromModhex extends Operation {
+
+    /**
+     * FromModhex constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "From Modhex";
+        this.module = "Default";
+        this.description = "Converts a modhex byte string back into its raw value.";
+        this.infoURL = "https://en.wikipedia.org/wiki/YubiKey#ModHex";
+        this.inputType = "string";
+        this.outputType = "byteArray";
+        this.args = [
+            {
+                name: "Delimiter",
+                type: "option",
+                value: FROM_MODHEX_DELIM_OPTIONS
+            }
+        ];
+        this.checks = [
+            {
+                pattern: "^(?:[cbdefghijklnrtuv]{2})+$",
+                flags: "i",
+                args: ["None"]
+            },
+            {
+                pattern: "^[cbdefghijklnrtuv]{2}(?: [cbdefghijklnrtuv]{2})*$",
+                flags: "i",
+                args: ["Space"]
+            },
+            {
+                pattern: "^[cbdefghijklnrtuv]{2}(?:,[cbdefghijklnrtuv]{2})*$",
+                flags: "i",
+                args: ["Comma"]
+            },
+            {
+                pattern: "^[cbdefghijklnrtuv]{2}(?:;[cbdefghijklnrtuv]{2})*$",
+                flags: "i",
+                args: ["Semi-colon"]
+            },
+            {
+                pattern: "^[cbdefghijklnrtuv]{2}(?::[cbdefghijklnrtuv]{2})*$",
+                flags: "i",
+                args: ["Colon"]
+            },
+            {
+                pattern: "^[cbdefghijklnrtuv]{2}(?:\\n[cbdefghijklnrtuv]{2})*$",
+                flags: "i",
+                args: ["Line feed"]
+            },
+            {
+                pattern: "^[cbdefghijklnrtuv]{2}(?:\\r\\n[cbdefghijklnrtuv]{2})*$",
+                flags: "i",
+                args: ["CRLF"]
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {byteArray}
+     */
+    run(input, args) {
+        const delim = args[0] || "Auto";
+        return fromModhex(input, delim, 2);
+    }
+}
+
+export default FromModhex;

src/core/operations/GenerateHOTP.mjs

@@ -5,16 +5,14 @@
  */
 
 import Operation from "../Operation.mjs";
-import otp from "otp";
+import * as OTPAuth from "otpauth";
-import ToBase32 from "./ToBase32.mjs";
 
 /**
  * Generate HOTP operation
  */
 class GenerateHOTP extends Operation {
-
     /**
-     * GenerateHOTP constructor
+     *
      */
     constructor() {
         super();
@@ -31,11 +29,6 @@ class GenerateHOTP extends Operation {
                 "type": "string",
                 "value": ""
             },
-            {
-                "name": "Key size",
-                "type": "number",
-                "value": 32
-            },
             {
                 "name": "Code length",
                 "type": "number",
@@ -50,21 +43,26 @@ class GenerateHOTP extends Operation {
     }
 
     /**
-     * @param {ArrayBuffer} input
+     *
-     * @param {Object[]} args
-     * @returns {string}
      */
     run(input, args) {
-        const otpObj = otp({
+        const secretStr = new TextDecoder("utf-8").decode(input).trim();
-            name: args[0],
+        const secret = secretStr ? secretStr.toUpperCase().replace(/\s+/g, "") : "";
-            keySize: args[1],
-            codeLength: args[2],
-            secret: (new ToBase32).run(input, []).split("=")[0],
-        });
-        const counter = args[3];
-        return `URI: ${otpObj.hotpURL}\n\nPassword: ${otpObj.hotp(counter)}`;
-    }
 
+        const hotp = new OTPAuth.HOTP({
+            issuer: "",
+            label: args[0],
+            algorithm: "SHA1",
+            digits: args[1],
+            counter: args[2],
+            secret: OTPAuth.Secret.fromBase32(secret)
+        });
+
+        const uri = hotp.toString();
+        const code = hotp.generate();
+
+        return `URI: ${uri}\n\nPassword: ${code}`;
+    }
 }
 
 export default GenerateHOTP;

src/core/operations/GenerateTOTP.mjs

@@ -5,20 +5,17 @@
  */
 
 import Operation from "../Operation.mjs";
-import otp from "otp";
+import * as OTPAuth from "otpauth";
-import ToBase32 from "./ToBase32.mjs";
 
 /**
  * Generate TOTP operation
  */
 class GenerateTOTP extends Operation {
-
     /**
-     * GenerateTOTP constructor
+     *
      */
     constructor() {
         super();
-
         this.name = "Generate TOTP";
         this.module = "Default";
         this.description = "The Time-based One-Time Password algorithm (TOTP) is an algorithm that computes a one-time password from a shared secret key and the current time. It has been adopted as Internet Engineering Task Force standard RFC 6238, is the cornerstone of Initiative For Open Authentication (OAUTH), and is used in a number of two-factor authentication systems. A TOTP is an HOTP where the counter is the current time.<br><br>Enter the secret as the input or leave it blank for a random secret to be generated. T0 and T1 are in seconds.";
@@ -31,11 +28,6 @@ class GenerateTOTP extends Operation {
                 "type": "string",
                 "value": ""
             },
-            {
-                "name": "Key size",
-                "type": "number",
-                "value": 32
-            },
             {
                 "name": "Code length",
                 "type": "number",
@@ -55,22 +47,27 @@ class GenerateTOTP extends Operation {
     }
 
     /**
-     * @param {ArrayBuffer} input
+     *
-     * @param {Object[]} args
-     * @returns {string}
      */
     run(input, args) {
-        const otpObj = otp({
+        const secretStr = new TextDecoder("utf-8").decode(input).trim();
-            name: args[0],
+        const secret = secretStr ? secretStr.toUpperCase().replace(/\s+/g, "") : "";
-            keySize: args[1],
-            codeLength: args[2],
-            secret: (new ToBase32).run(input, []).split("=")[0],
-            epoch: args[3],
-            timeSlice: args[4]
-        });
-        return `URI: ${otpObj.totpURL}\n\nPassword: ${otpObj.totp()}`;
-    }
 
+        const totp = new OTPAuth.TOTP({
+            issuer: "",
+            label: args[0],
+            algorithm: "SHA1",
+            digits: args[1],
+            period: args[3],
+            epoch: args[2] * 1000, // Convert seconds to milliseconds
+            secret: OTPAuth.Secret.fromBase32(secret)
+        });
+
+        const uri = totp.toString();
+        const code = totp.generate();
+
+        return `URI: ${uri}\n\nPassword: ${code}`;
+    }
 }
 
 export default GenerateTOTP;

src/core/operations/LuhnChecksum.mjs

@@ -1,5 +1,6 @@
 /**
  * @author n1073645 [n1073645@gmail.com]
+ * @author k3ach [k3ach@proton.me]
  * @copyright Crown Copyright 2020
  * @license Apache-2.0
  */
@@ -20,39 +21,46 @@ class LuhnChecksum extends Operation {
 
         this.name = "Luhn Checksum";
         this.module = "Default";
-        this.description = "The Luhn algorithm, also known as the modulus 10 or mod 10 algorithm, is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers and Canadian Social Insurance Numbers.";
+        this.description = "The Luhn mod N algorithm using the english alphabet. The Luhn mod N algorithm is an extension to the Luhn algorithm (also known as mod 10 algorithm) that allows it to work with sequences of values in any even-numbered base. This can be useful when a check digit is required to validate an identification string composed of letters, a combination of letters and digits or any arbitrary set of N characters where N is divisible by 2.";
-        this.infoURL = "https://wikipedia.org/wiki/Luhn_algorithm";
+        this.infoURL = "https://en.wikipedia.org/wiki/Luhn_mod_N_algorithm";
         this.inputType = "string";
         this.outputType = "string";
-        this.args = [];
+        this.args = [
+            {
+                "name": "Radix",
+                "type": "number",
+                "value": 10
+            }
+        ];
     }
 
     /**
-     * Generates the Luhn Checksum from the input.
+     * Generates the Luhn checksum from the input.
      *
      * @param {string} inputStr
      * @returns {number}
      */
-    checksum(inputStr) {
+    checksum(inputStr, radix = 10) {
         let even = false;
         return inputStr.split("").reverse().reduce((acc, elem) => {
-            // Convert element to integer.
+            // Convert element to an integer based on the provided radix.
-            let temp = parseInt(elem, 10);
+            let temp = parseInt(elem, radix);
 
-            // If element is not an integer.
+            // If element is not a valid number in the given radix.
-            if (isNaN(temp))
+            if (isNaN(temp)) {
-                throw new OperationError("Character: " + elem + " is not a digit.");
+                throw new Error("Character: " + elem + " is not valid in radix " + radix + ".");
+            }
 
             // If element is in an even position
             if (even) {
-                // Double the element and add the quotient and remainder together.
+                // Double the element and sum the quotient and remainder.
-                temp = 2 * elem;
+                temp = 2 * temp;
-                temp = Math.floor(temp/10) + (temp % 10);
+                temp = Math.floor(temp / radix) + (temp % radix);
             }
 
             even = !even;
             return acc + temp;
-        }, 0)  % 10;
+        }, 0) % radix; // Use radix as the modulus base
     }
 
     /**
@@ -63,9 +71,20 @@ class LuhnChecksum extends Operation {
     run(input, args) {
         if (!input) return "";
 
-        const checkSum = this.checksum(input);
+        const radix = args[0];
-        let checkDigit = this.checksum(input + "0");
+
-        checkDigit = checkDigit === 0 ? 0 : (10-checkDigit);
+        if (radix < 2 || radix > 36) {
+            throw new OperationError("Error: Radix argument must be between 2 and 36");
+        }
+
+        if (radix % 2 !== 0) {
+            throw new OperationError("Error: Radix argument must be divisible by 2");
+        }
+
+        const checkSum = this.checksum(input, radix).toString(radix);
+        let checkDigit = this.checksum(input + "0", radix);
+        checkDigit = checkDigit === 0 ? 0 : (radix - checkDigit);
+        checkDigit = checkDigit.toString(radix);
 
         return `Checksum: ${checkSum}
 Checkdigit: ${checkDigit}

src/core/operations/MIMEDecoding.mjs

@@ -0,0 +1,171 @@
+/**
+ * @author mshwed [m@ttshwed.com]
+ * @copyright Crown Copyright 2019
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import OperationError from "../errors/OperationError.mjs";
+import Utils from "../Utils.mjs";
+import { fromHex } from "../lib/Hex.mjs";
+import { fromBase64 } from "../lib/Base64.mjs";
+import cptable from "codepage";
+
+/**
+ * MIME Decoding operation
+ */
+class MIMEDecoding extends Operation {
+
+    /**
+     * MIMEDecoding constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "MIME Decoding";
+        this.module = "Default";
+        this.description = "Enables the decoding of MIME message header extensions for non-ASCII text";
+        this.infoURL = "https://tools.ietf.org/html/rfc2047";
+        this.inputType = "byteArray";
+        this.outputType = "string";
+        this.args = [];
+    }
+
+    /**
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const mimeEncodedText = Utils.byteArrayToUtf8(input);
+        const encodedHeaders = mimeEncodedText.replace(/\r\n/g, "\n");
+
+        const decodedHeader = this.decodeHeaders(encodedHeaders);
+
+        return decodedHeader;
+    }
+
+    /**
+     * Decode MIME header strings
+     *
+     * @param headerString
+     */
+    decodeHeaders(headerString) {
+        // No encoded words detected
+        let i = headerString.indexOf("=?");
+        if (i === -1) return headerString;
+
+        let decodedHeaders = headerString.slice(0, i);
+        let header = headerString.slice(i);
+
+        let isBetweenWords = false;
+        let start, cur, charset, encoding, j, end, text;
+        while (header.length > -1) {
+            start = header.indexOf("=?");
+            if (start === -1) break;
+            cur = start + "=?".length;
+
+            i = header.slice(cur).indexOf("?");
+            if (i === -1) break;
+
+            charset = header.slice(cur, cur + i);
+            cur += i + "?".length;
+
+            if (header.length < cur + "Q??=".length) break;
+
+            encoding = header[cur];
+            cur += 1;
+
+            if (header[cur] !== "?") break;
+
+            cur += 1;
+
+            j = header.slice(cur).indexOf("?=");
+            if (j === -1) break;
+
+            text = header.slice(cur, cur + j);
+            end = cur + j + "?=".length;
+
+            if (encoding.toLowerCase() === "b") {
+                text = fromBase64(text);
+            } else if (encoding.toLowerCase() === "q") {
+                text = this.parseQEncodedWord(text);
+            } else {
+                isBetweenWords = false;
+                decodedHeaders += header.slice(0, start + 2);
+                header = header.slice(start + 2);
+            }
+
+            if (start > 0 && (!isBetweenWords || header.slice(0, start).search(/\S/g) > -1)) {
+                decodedHeaders += header.slice(0, start);
+            }
+
+            decodedHeaders += this.convertFromCharset(charset, text);
+
+            header = header.slice(end);
+            isBetweenWords = true;
+        }
+
+        if (header.length > 0) {
+            decodedHeaders += header;
+        }
+
+        return decodedHeaders;
+    }
+
+    /**
+     * Converts decoded text for supported charsets.
+     * Supports UTF-8, US-ASCII, ISO-8859-*
+     *
+     * @param encodedWord
+     */
+    convertFromCharset(charset, encodedText) {
+        charset = charset.toLowerCase();
+        const parsedCharset = charset.split("-");
+
+        if (parsedCharset.length === 2 && parsedCharset[0] === "utf" && charset === "utf-8") {
+            return cptable.utils.decode(65001, encodedText);
+        } else if (parsedCharset.length === 2 && charset === "us-ascii") {
+            return cptable.utils.decode(20127, encodedText);
+        } else if (parsedCharset.length === 3 && parsedCharset[0] === "iso" && parsedCharset[1] === "8859") {
+            const isoCharset = parseInt(parsedCharset[2], 10);
+            if (isoCharset >= 1 && isoCharset <= 16) {
+                return cptable.utils.decode(28590 + isoCharset, encodedText);
+            }
+        }
+
+        throw new OperationError("Unhandled Charset");
+    }
+
+    /**
+     * Parses a Q encoded word
+     *
+     * @param encodedWord
+     */
+    parseQEncodedWord(encodedWord) {
+        let decodedWord = "";
+        for (let i = 0; i < encodedWord.length; i++) {
+            if (encodedWord[i] === "_") {
+                decodedWord += " ";
+            // Parse hex encoding
+            } else if (encodedWord[i] === "=") {
+                if ((i + 2) >= encodedWord.length) throw new OperationError("Incorrectly Encoded Word");
+                const decodedHex = Utils.byteArrayToChars(fromHex(encodedWord.substring(i + 1, i + 3)));
+                decodedWord += decodedHex;
+                i += 2;
+            } else if (
+                (encodedWord[i].charCodeAt(0) >= " ".charCodeAt(0) && encodedWord[i].charCodeAt(0) <= "~".charCodeAt(0)) ||
+                encodedWord[i] === "\n" ||
+                encodedWord[i] === "\r" ||
+                encodedWord[i] === "\t") {
+                decodedWord += encodedWord[i];
+            } else {
+                throw new OperationError("Incorrectly Encoded Word");
+            }
+        }
+
+        return decodedWord;
+    }
+}
+
+export default MIMEDecoding;

src/core/operations/ROT13.mjs

@@ -59,15 +59,16 @@ class ROT13 extends Operation {
             rot13Upperacse = args[1],
             rotNumbers = args[2];
         let amount = args[3],
-            chr;
+            amountNumbers = args[3];
 
         if (amount) {
             if (amount < 0) {
                 amount = 26 - (Math.abs(amount) % 26);
+                amountNumbers = 10 - (Math.abs(amountNumbers) % 10);
             }
 
             for (let i = 0; i < input.length; i++) {
-                chr = input[i];
+                let chr = input[i];
                 if (rot13Upperacse && chr >= 65 && chr <= 90) { // Upper case
                     chr = (chr - 65 + amount) % 26;
                     output[i] = chr + 65;
@@ -75,7 +76,7 @@ class ROT13 extends Operation {
                     chr = (chr - 97 + amount) % 26;
                     output[i] = chr + 97;
                 } else if (rotNumbers && chr >= 48 && chr <= 57) { // Numbers
-                    chr = (chr - 48 + amount) % 10;
+                    chr = (chr - 48 + amountNumbers) % 10;
                     output[i] = chr + 48;
                 }
             }

src/core/operations/ToModhex.mjs

@@ -0,0 +1,55 @@
+/**
+ * @author linuxgemini [ilteris@asenkron.com.tr]
+ * @copyright Crown Copyright 2024
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import { TO_MODHEX_DELIM_OPTIONS, toModhex } from "../lib/Modhex.mjs";
+import Utils from "../Utils.mjs";
+
+/**
+ * To Modhex operation
+ */
+class ToModhex extends Operation {
+
+    /**
+     * ToModhex constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "To Modhex";
+        this.module = "Default";
+        this.description = "Converts the input string to modhex bytes separated by the specified delimiter.";
+        this.infoURL = "https://en.wikipedia.org/wiki/YubiKey#ModHex";
+        this.inputType = "ArrayBuffer";
+        this.outputType = "string";
+        this.args = [
+            {
+                name: "Delimiter",
+                type: "option",
+                value: TO_MODHEX_DELIM_OPTIONS
+            },
+            {
+                name: "Bytes per line",
+                type: "number",
+                value: 0
+            }
+        ];
+    }
+
+    /**
+     * @param {ArrayBuffer} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const delim = Utils.charRep(args[0]);
+        const lineSize = args[1];
+
+        return toModhex(new Uint8Array(input), delim, 2, "", lineSize);
+    }
+}
+
+export default ToModhex;

src/core/operations/TripleDESDecrypt.mjs

@@ -22,7 +22,7 @@ class TripleDESDecrypt extends Operation {
 
         this.name = "Triple DES Decrypt";
         this.module = "Ciphers";
-        this.description = "Triple DES applies DES three times to each block to increase key size.<br><br><b>Key:</b> Triple DES uses a key length of 24 bytes (192 bits).<br>DES uses a key length of 8 bytes (64 bits).<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used as a default.";
+        this.description = "Triple DES applies DES three times to each block to increase key size.<br><br><b>Key:</b> Triple DES uses a key length of 24 bytes (192 bits).<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used as a default.";
         this.infoURL = "https://wikipedia.org/wiki/Triple_DES";
         this.inputType = "string";
         this.outputType = "string";
@@ -73,8 +73,7 @@ class TripleDESDecrypt extends Operation {
         if (key.length !== 24 && key.length !== 16) {
             throw new OperationError(`Invalid key length: ${key.length} bytes
 
-Triple DES uses a key length of 24 bytes (192 bits).
+Triple DES uses a key length of 24 bytes (192 bits).`);
-DES uses a key length of 8 bytes (64 bits).`);
         }
         if (iv.length !== 8 && mode !== "ECB") {
             throw new OperationError(`Invalid IV length: ${iv.length} bytes

src/core/operations/TripleDESEncrypt.mjs

@@ -22,7 +22,7 @@ class TripleDESEncrypt extends Operation {
 
         this.name = "Triple DES Encrypt";
         this.module = "Ciphers";
-        this.description = "Triple DES applies DES three times to each block to increase key size.<br><br><b>Key:</b> Triple DES uses a key length of 24 bytes (192 bits).<br>DES uses a key length of 8 bytes (64 bits).<br><br>You can generate a password-based key using one of the KDF operations.<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used.";
+        this.description = "Triple DES applies DES three times to each block to increase key size.<br><br><b>Key:</b> Triple DES uses a key length of 24 bytes (192 bits).<br><br>You can generate a password-based key using one of the KDF operations.<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used.";
         this.infoURL = "https://wikipedia.org/wiki/Triple_DES";
         this.inputType = "string";
         this.outputType = "string";
@@ -72,8 +72,7 @@ class TripleDESEncrypt extends Operation {
         if (key.length !== 24 && key.length !== 16) {
             throw new OperationError(`Invalid key length: ${key.length} bytes
 
-Triple DES uses a key length of 24 bytes (192 bits).
+Triple DES uses a key length of 24 bytes (192 bits).`);
-DES uses a key length of 8 bytes (64 bits).`);
         }
         if (iv.length !== 8 && mode !== "ECB") {
             throw new OperationError(`Invalid IV length: ${iv.length} bytes

src/web/App.mjs

@@ -60,6 +60,7 @@ class App {
 
         this.initialiseSplitter();
         this.loadLocalStorage();
+        this.manager.options.applyPreferredColorScheme();
         this.populateOperationsList();
         this.manager.setup();
         this.manager.output.saveBombe();
@@ -536,6 +537,8 @@ class App {
         // Read in theme from URI params
         if (this.uriParams.theme) {
             this.manager.options.changeTheme(Utils.escapeHtml(this.uriParams.theme));
+        } else {
+            this.manager.options.applyPreferredColorScheme();
         }
 
         window.dispatchEvent(this.manager.statechange);

src/web/waiters/OptionsWaiter.mjs

@@ -163,6 +163,14 @@ class OptionsWaiter {
         themeSelect.selectedIndex = themeSelect.querySelector(`option[value="${theme}"`).index;
     }
 
+    /**
+     * Applies the user's preferred color scheme using the `prefers-color-scheme` media query.
+     */
+    applyPreferredColorScheme() {
+        const prefersDarkScheme = window.matchMedia("(prefers-color-scheme: dark)").matches;
+        const theme = prefersDarkScheme ? "dark" : "classic";
+        this.changeTheme(theme);
+    }
 
     /**
      * Changes the console logging level.

tests/node/tests/nodeApi.mjs

@@ -119,7 +119,7 @@ TestRegister.addApiTests([
         assert.strictEqual(result[0].module, "Ciphers");
         assert.strictEqual(result[0].inputType, "string");
         assert.strictEqual(result[0].outputType, "string");
-        assert.strictEqual(result[0].description, "Triple DES applies DES three times to each block to increase key size.<br><br><b>Key:</b> Triple DES uses a key length of 24 bytes (192 bits).<br>DES uses a key length of 8 bytes (64 bits).<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used as a default.");
+        assert.strictEqual(result[0].description, "Triple DES applies DES three times to each block to increase key size.<br><br><b>Key:</b> Triple DES uses a key length of 24 bytes (192 bits).<br><br><b>IV:</b> The Initialization Vector should be 8 bytes long. If not entered, it will default to 8 null bytes.<br><br><b>Padding:</b> In CBC and ECB mode, PKCS#7 padding will be used as a default.");
         assert.strictEqual(result[0].args.length, 5);
     }),
 

tests/node/tests/operations.mjs

@@ -575,12 +575,11 @@ Top Drawer`, {
     }),
 
     it("Generate HOTP", () => {
-        const result = chef.generateHOTP("Cut The Mustard", {
+        const result = chef.generateHOTP("JBSWY3DPEHPK3PXP", {
-            name: "colonel",
         });
-        const expected = `URI: otpauth://hotp/colonel?secret=IN2XIICUNBSSATLVON2GC4TE
+        const expected = `URI: otpauth://hotp/?secret=JBSWY3DPEHPK3PXP&algorithm=SHA1&digits=6&counter=0
 
-Password: 034148`;
+Password: 282760`;
         assert.strictEqual(result.toString(), expected);
     }),
 

tests/operations/index.mjs

@@ -54,6 +54,7 @@ import "./tests/Comment.mjs";
 import "./tests/Compress.mjs";
 import "./tests/ConditionalJump.mjs";
 import "./tests/ConvertCoordinateFormat.mjs";
+import "./tests/ConvertLeetSpeak.mjs";
 import "./tests/ConvertToNATOAlphabet.mjs";
 import "./tests/Crypt.mjs";
 import "./tests/CSV.mjs";
@@ -103,6 +104,8 @@ import "./tests/LZNT1Decompress.mjs";
 import "./tests/LZString.mjs";
 import "./tests/Magic.mjs";
 import "./tests/Media.mjs";
+import "./tests/MIMEDecoding.mjs";
+import "./tests/Modhex.mjs";
 import "./tests/MorseCode.mjs";
 import "./tests/MS.mjs";
 import "./tests/MultipleBombe.mjs";

tests/operations/tests/ConvertLeetSpeak.mjs

@@ -0,0 +1,33 @@
+/**
+ * @author bartblaze []
+ * @copyright Crown Copyright 2025
+ * @license Apache-2.0
+ */
+
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        name: "Convert to Leet Speak: basic text",
+        input: "leet",
+        expectedOutput: "l337",
+        recipeConfig: [
+            {
+                op: "Convert Leet Speak",
+                args: ["To Leet Speak"]
+            }
+        ]
+    },
+    {
+        name: "Convert from Leet Speak: basic leet",
+        input: "l337",
+        expectedOutput: "leet",
+        recipeConfig: [
+            {
+                op: "Convert Leet Speak",
+                args: ["From Leet Speak"]
+            }
+        ]
+    }
+]);
+

tests/operations/tests/Crypt.mjs

@@ -580,8 +580,7 @@ Tag: a8f04c4d93bbef82bef61a103371aef9`,
         input: "",
         expectedOutput: `Invalid key length: 0 bytes
 
-DES uses a key length of 8 bytes (64 bits).
+DES uses a key length of 8 bytes (64 bits).`,
-Triple DES uses a key length of 24 bytes (192 bits).`,
         recipeConfig: [
             {
                 "op": "DES Encrypt",
@@ -674,8 +673,7 @@ Triple DES uses a key length of 24 bytes (192 bits).`,
         input: "",
         expectedOutput: `Invalid key length: 0 bytes
 
-Triple DES uses a key length of 24 bytes (192 bits).
+Triple DES uses a key length of 24 bytes (192 bits).`,
-DES uses a key length of 8 bytes (64 bits).`,
         recipeConfig: [
             {
                 "op": "Triple DES Encrypt",
@@ -1300,8 +1298,7 @@ The following algorithms will be used based on the size of the key:
         input: "",
         expectedOutput: `Invalid key length: 0 bytes
 
-DES uses a key length of 8 bytes (64 bits).
+DES uses a key length of 8 bytes (64 bits).`,
-Triple DES uses a key length of 24 bytes (192 bits).`,
         recipeConfig: [
             {
                 "op": "DES Decrypt",
@@ -1394,8 +1391,7 @@ Triple DES uses a key length of 24 bytes (192 bits).`,
         input: "",
         expectedOutput: `Invalid key length: 0 bytes
 
-Triple DES uses a key length of 24 bytes (192 bits).
+Triple DES uses a key length of 24 bytes (192 bits).`,
-DES uses a key length of 8 bytes (64 bits).`,
         recipeConfig: [
             {
                 "op": "Triple DES Decrypt",

tests/operations/tests/LuhnChecksum.mjs

@@ -2,11 +2,392 @@
  * From Decimal tests
  *
  * @author n1073645 [n1073645@gmail.com]
+ * @author k3ach [k3ach@proton.me]
  * @copyright Crown Copyright 2020
  * @licence Apache-2.0
  */
 import TestRegister from "../../lib/TestRegister.mjs";
 
+const testCases = [
+    {
+        radix: 2,
+        input: "01",
+        checksum: "1",
+        checkdigit: "1",
+    }, {
+        radix: 2,
+        input: "001111",
+        checksum: "0",
+        checkdigit: "0",
+    }, {
+        radix: 2,
+        input: "00011101",
+        checksum: "0",
+        checkdigit: "0",
+    }, {
+        radix: 2,
+        input: "0100101101",
+        checksum: "1",
+        checkdigit: "1",
+    }, {
+        radix: 4,
+        input: "0123",
+        checksum: "1",
+        checkdigit: "1",
+    }, {
+        radix: 4,
+        input: "130100",
+        checksum: "2",
+        checkdigit: "2",
+    }, {
+        radix: 4,
+        input: "32020313",
+        checksum: "3",
+        checkdigit: "0",
+    }, {
+        radix: 4,
+        input: "302233210112",
+        checksum: "3",
+        checkdigit: "0",
+    }, {
+        radix: 6,
+        input: "012345",
+        checksum: "4",
+        checkdigit: "4",
+    }, {
+        radix: 6,
+        input: "134255",
+        checksum: "2",
+        checkdigit: "4",
+    }, {
+        radix: 6,
+        input: "15021453",
+        checksum: "5",
+        checkdigit: "4",
+    }, {
+        radix: 6,
+        input: "211450230513",
+        checksum: "3",
+        checkdigit: "1",
+    }, {
+        radix: 8,
+        input: "01234567",
+        checksum: "2",
+        checkdigit: "2",
+    }, {
+        radix: 8,
+        input: "340624",
+        checksum: "0",
+        checkdigit: "4",
+    }, {
+        radix: 8,
+        input: "07260247",
+        checksum: "3",
+        checkdigit: "3",
+    }, {
+        radix: 8,
+        input: "026742114675",
+        checksum: "7",
+        checkdigit: "1",
+    }, {
+        radix: 10,
+        input: "0123456789",
+        checksum: "7",
+        checkdigit: "7",
+    }, {
+        radix: 10,
+        input: "468543",
+        checksum: "7",
+        checkdigit: "4",
+    }, {
+        radix: 10,
+        input: "59377601",
+        checksum: "5",
+        checkdigit: "6",
+    }, {
+        radix: 10,
+        input: "013909981254",
+        checksum: "1",
+        checkdigit: "3",
+    }, {
+        radix: 12,
+        input: "0123456789ab",
+        checksum: "3",
+        checkdigit: "3",
+    }, {
+        radix: 12,
+        input: "284685",
+        checksum: "0",
+        checkdigit: "6",
+    }, {
+        radix: 12,
+        input: "951a2661",
+        checksum: "0",
+        checkdigit: "8",
+    }, {
+        radix: 12,
+        input: "898202676387",
+        checksum: "b",
+        checkdigit: "9",
+    }, {
+        radix: 14,
+        input: "0123456789abcd",
+        checksum: "a",
+        checkdigit: "a",
+    }, {
+        radix: 14,
+        input: "33db25",
+        checksum: "0",
+        checkdigit: "d",
+    }, {
+        radix: 14,
+        input: "0b4ac128",
+        checksum: "b",
+        checkdigit: "3",
+    }, {
+        radix: 14,
+        input: "3d1c6d16160d",
+        checksum: "3",
+        checkdigit: "c",
+    }, {
+        radix: 16,
+        input: "0123456789abcdef",
+        checksum: "4",
+        checkdigit: "4",
+    }, {
+        radix: 16,
+        input: "e1fe64",
+        checksum: "b",
+        checkdigit: "6",
+    }, {
+        radix: 16,
+        input: "241a5dcd",
+        checksum: "1",
+        checkdigit: "9",
+    }, {
+        radix: 16,
+        input: "1fea740e0e1f",
+        checksum: "7",
+        checkdigit: "4",
+    }, {
+        radix: 18,
+        input: "0123456789abcdefgh",
+        checksum: "d",
+        checkdigit: "d",
+    }, {
+        radix: 18,
+        input: "995dgf",
+        checksum: "9",
+        checkdigit: "1",
+    }, {
+        radix: 18,
+        input: "9f80h32h",
+        checksum: "1",
+        checkdigit: "0",
+    }, {
+        radix: 18,
+        input: "5f9428e493g4",
+        checksum: "8",
+        checkdigit: "c",
+    }, {
+        radix: 20,
+        input: "0123456789abcdefghij",
+        checksum: "5",
+        checkdigit: "5",
+    }, {
+        radix: 20,
+        input: "918jci",
+        checksum: "h",
+        checkdigit: "d",
+    }, {
+        radix: 20,
+        input: "jab7j50d",
+        checksum: "g",
+        checkdigit: "j",
+    }, {
+        radix: 20,
+        input: "c56fe85eb6gg",
+        checksum: "g",
+        checkdigit: "5",
+    }, {
+        radix: 22,
+        input: "0123456789abcdefghijkl",
+        checksum: "g",
+        checkdigit: "g",
+    }, {
+        radix: 22,
+        input: "de57le",
+        checksum: "5",
+        checkdigit: "l",
+    }, {
+        radix: 22,
+        input: "e3fg6dfc",
+        checksum: "f",
+        checkdigit: "d",
+    }, {
+        radix: 22,
+        input: "1f8l80ai4kbg",
+        checksum: "l",
+        checkdigit: "f",
+    }, {
+        radix: 24,
+        input: "0123456789abcdefghijklmn",
+        checksum: "6",
+        checkdigit: "6",
+    }, {
+        radix: 24,
+        input: "agne7d",
+        checksum: "4",
+        checkdigit: "f",
+    }, {
+        radix: 24,
+        input: "1l4d9cf4",
+        checksum: "d",
+        checkdigit: "c",
+    }, {
+        radix: 24,
+        input: "blc1j09i3296",
+        checksum: "8",
+        checkdigit: "7",
+    }, {
+        radix: 26,
+        input: "0123456789abcdefghijklmnop",
+        checksum: "j",
+        checkdigit: "j",
+    }, {
+        radix: 26,
+        input: "82n9op",
+        checksum: "i",
+        checkdigit: "2",
+    }, {
+        radix: 26,
+        input: "e9cddn70",
+        checksum: "9",
+        checkdigit: "i",
+    }, {
+        radix: 26,
+        input: "ck0ep419knom",
+        checksum: "p",
+        checkdigit: "g",
+    }, {
+        radix: 28,
+        input: "0123456789abcdefghijklmnopqr",
+        checksum: "7",
+        checkdigit: "7",
+    }, {
+        radix: 28,
+        input: "a6hnoo",
+        checksum: "h",
+        checkdigit: "9",
+    }, {
+        radix: 28,
+        input: "lblc7kh0",
+        checksum: "a",
+        checkdigit: "f",
+    }, {
+        radix: 28,
+        input: "64k5piod3lmf",
+        checksum: "0",
+        checkdigit: "p",
+    }, {
+        radix: 30,
+        input: "0123456789abcdefghijklmnopqrst",
+        checksum: "m",
+        checkdigit: "m",
+    }, {
+        radix: 30,
+        input: "t69j7d",
+        checksum: "9",
+        checkdigit: "s",
+    }, {
+        radix: 30,
+        input: "p54o9ig3",
+        checksum: "a",
+        checkdigit: "o",
+    }, {
+        radix: 30,
+        input: "gc1njrt55030",
+        checksum: "6",
+        checkdigit: "1",
+    }, {
+        radix: 32,
+        input: "0123456789abcdefghijklmnopqrstuv",
+        checksum: "8",
+        checkdigit: "8",
+    }, {
+        radix: 32,
+        input: "rdou19",
+        checksum: "u",
+        checkdigit: "3",
+    }, {
+        radix: 32,
+        input: "ighj0pc7",
+        checksum: "3",
+        checkdigit: "8",
+    }, {
+        radix: 32,
+        input: "op4nn5fvjsrs",
+        checksum: "g",
+        checkdigit: "j",
+    }, {
+        radix: 34,
+        input: "0123456789abcdefghijklmnopqrstuvwx",
+        checksum: "p",
+        checkdigit: "p",
+    }, {
+        radix: 34,
+        input: "nvftj5",
+        checksum: "b",
+        checkdigit: "f",
+    }, {
+        radix: 34,
+        input: "u9v9g162",
+        checksum: "j",
+        checkdigit: "b",
+    }, {
+        radix: 34,
+        input: "o5gqg5d7gjh9",
+        checksum: "5",
+        checkdigit: "q",
+    }, {
+        radix: 36,
+        input: "0123456789abcdefghijklmnopqrstuvwxyz",
+        checksum: "9",
+        checkdigit: "9",
+    }, {
+        radix: 36,
+        input: "29zehu",
+        checksum: "i",
+        checkdigit: "j",
+    }, {
+        radix: 36,
+        input: "1snmikbu",
+        checksum: "s",
+        checkdigit: "v",
+    }, {
+        radix: 36,
+        input: "jpkar545q7gb",
+        checksum: "3",
+        checkdigit: "d",
+    },
+];
+
+testCases.forEach(element => {
+    TestRegister.addTests([
+        {
+            name: "Luhn Checksum Mod " + element.radix + " on " + element.input,
+            input: element.input,
+            expectedOutput: "Checksum: " + element.checksum + "\nCheckdigit: " + element.checkdigit + "\nLuhn Validated String: " + element.input + element.checkdigit,
+            recipeConfig: [
+                {
+                    op: "Luhn Checksum",
+                    args: [element.radix]
+                },
+            ],
+        },
+    ]);
+});
+
 TestRegister.addTests([
     {
         name: "Luhn Checksum on standard data",
@@ -15,7 +396,7 @@ TestRegister.addTests([
         recipeConfig: [
             {
                 op: "Luhn Checksum",
-                args: []
+                args: [10]
             },
         ],
     },
@@ -26,7 +407,7 @@ TestRegister.addTests([
         recipeConfig: [
             {
                 op: "Luhn Checksum",
-                args: []
+                args: [10]
             },
         ],
     },
@@ -37,18 +418,7 @@ TestRegister.addTests([
         recipeConfig: [
             {
                 op: "Luhn Checksum",
-                args: []
+                args: [10]
-            },
-        ],
-    },
-    {
-        name: "Luhn Checksum on invalid data",
-        input: "35641709b012469",
-        expectedOutput: "Character: b is not a digit.",
-        recipeConfig: [
-            {
-                op: "Luhn Checksum",
-                args: []
             },
         ],
     },
@@ -59,8 +429,8 @@ TestRegister.addTests([
         recipeConfig: [
             {
                 op: "Luhn Checksum",
-                args: []
+                args: [10]
             },
         ],
-    }
+    },
 ]);

tests/operations/tests/MIMEDecoding.mjs

@@ -0,0 +1,89 @@
+/**
+ * MIME Header Decoding tests
+ *
+ * @author mshwed [m@ttshwed.com]
+ * @copyright Crown Copyright 2019
+ * @license Apache-2.0
+ */
+
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        name: "Encoded comments",
+        input: "(=?ISO-8859-1?Q?a?=)",
+        expectedOutput: "(a)",
+        recipeConfig: [
+            {
+                "op": "MIME Decoding",
+                "args": []
+            }
+        ]
+    },
+    {
+        name: "Encoded adjacent comments whitespace",
+        input: "(=?ISO-8859-1?Q?a?= b)",
+        expectedOutput: "(a b)",
+        recipeConfig: [
+            {
+                "op": "MIME Decoding",
+                "args": []
+            }
+        ]
+    },
+    {
+        name: "Encoded adjacent single whitespace ignored",
+        input: "(=?ISO-8859-1?Q?a?= =?ISO-8859-1?Q?b?=)",
+        expectedOutput: "(ab)",
+        recipeConfig: [
+            {
+                "op": "MIME Decoding",
+                "args": []
+            }
+        ]
+    },
+    {
+        name: "Encoded adjacent double whitespace ignored",
+        input: "(=?ISO-8859-1?Q?a?=  =?ISO-8859-1?Q?b?=)",
+        expectedOutput: "(ab)",
+        recipeConfig: [
+            {
+                "op": "MIME Decoding",
+                "args": []
+            }
+        ]
+    },
+    {
+        name: "Encoded adjacent CRLF whitespace ignored",
+        input: "(=?ISO-8859-1?Q?a?=\r\n =?ISO-8859-1?Q?b?=)",
+        expectedOutput: "(ab)",
+        recipeConfig: [
+            {
+                "op": "MIME Decoding",
+                "args": []
+            }
+        ]
+    },
+    {
+        name: "UTF-8 Encodings Multiple Headers",
+        input: "=?utf-8?q?=C3=89ric?= <eric@example.org>, =?utf-8?q?Ana=C3=AFs?= <anais@example.org>",
+        expectedOutput: "Éric <eric@example.org>, Anaïs <anais@example.org>",
+        recipeConfig: [
+            {
+                "op": "MIME Decoding",
+                "args": []
+            }
+        ]
+    },
+    {
+        name: "ISO Decoding",
+        input: "From: =?US-ASCII?Q?Keith_Moore?= <moore@cs.utk.edu>\nTo: =?ISO-8859-1?Q?Keld_J=F8rn_Simonsen?= <keld@dkuug.dk>\nCC: =?ISO-8859-1?Q?Andr=E9?= Pirard <PIRARD@vm1.ulg.ac.be>\nSubject: =?ISO-8859-1?B?SWYgeW91IGNhbiByZWFkIHRoaXMgeW8=?=\n=?ISO-8859-2?B?dSB1bmRlcnN0YW5kIHRoZSBleGFtcGxlLg==?=",
+        expectedOutput: "From: Keith Moore <moore@cs.utk.edu>\nTo: Keld Jørn Simonsen <keld@dkuug.dk>\nCC: André Pirard <PIRARD@vm1.ulg.ac.be>\nSubject: If you can read this you understand the example.",
+        recipeConfig: [
+            {
+                "op": "MIME Decoding",
+                "args": []
+            }
+        ]
+    }
+]);

tests/operations/tests/Modhex.mjs

@@ -0,0 +1,150 @@
+/**
+ * Modhex operation tests.
+ * @author linuxgemini [ilteris@asenkron.com.tr]
+ * @copyright Crown Copyright 2024
+ * @license Apache-2.0
+ */
+
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        name: "ASCII to Modhex stream",
+        input: "aberystwyth",
+        expectedOutput: "hbhdhgidikieifiiikifhj",
+        recipeConfig: [
+            {
+                "op": "To Modhex",
+                "args": [
+                    "None",
+                    0
+                ]
+            },
+        ]
+    },
+    {
+        name: "ASCII to Modhex with colon deliminator",
+        input: "aberystwyth",
+        expectedOutput: "hb:hd:hg:id:ik:ie:if:ii:ik:if:hj",
+        recipeConfig: [
+            {
+                "op": "To Modhex",
+                "args": [
+                    "Colon",
+                    0
+                ]
+            }
+        ]
+    },
+    {
+        name: "Modhex stream to UTF-8",
+        input: "uhkgkbuhkgkbugltlkugltkc",
+        expectedOutput: "救救孩子",
+        recipeConfig: [
+            {
+                "op": "From Modhex",
+                "args": [
+                    "Auto"
+                ]
+            }
+        ]
+
+    },
+    {
+        name: "Mixed case Modhex stream to UTF-8",
+        input: "uhKGkbUHkgkBUGltlkugltkc",
+        expectedOutput: "救救孩子",
+        recipeConfig: [
+            {
+                "op": "From Modhex",
+                "args": [
+                    "Auto"
+                ]
+            }
+        ]
+
+    },
+    {
+        name: "Mutiline Modhex with comma to ASCII (Auto Mode)",
+        input: "fk,dc,ie,hb,ii,dc,ht,ik,ie,hg,hr,hh,dc,ie,hk,\n\
+if,if,hk,hu,hi,dc,hk,hu,dc,if,hj,hg,dc,he,id,\n\
+hv,if,he,hj,dc,hv,hh,dc,if,hj,hg,dc,if,hj,hk,\n\
+ie,dc,hh,hk,hi,dc,if,id,hg,hg,dr,dc,ie,if,hb,\n\
+id,ih,hk,hu,hi,dc,if,hv,dc,hf,hg,hb,if,hj,dr,\n\
+dc,hl,ig,ie,if,dc,hd,hg,he,hb,ig,ie,hg,dc,fk,\n\
+dc,he,hv,ig,hr,hf,hu,di,if,dc,ht,hb,hn,hg,dc,\n\
+ig,ic,dc,ht,ik,dc,ht,hk,hu,hf,dc,ii,hj,hk,he,\n\
+hj,dc,hv,hh,dc,if,hj,hg,dc,hh,hk,hi,ie,dc,fk,\n\
+dc,ii,hv,ig,hr,hf,dc,he,hj,hv,hv,ie,hg,du",
+        expectedOutput: "I saw myself sitting in the crotch of the this fig tree, starving to death, just because I couldn't make up my mind which of the figs I would choose.",
+        recipeConfig: [
+            {
+                "op": "From Modhex",
+                "args": [
+                    "Auto"
+                ]
+            }
+        ]
+
+    },
+    {
+        name: "Mutiline Modhex with percent to ASCII (Percent Mode)",
+        input: "fk%dc%ie%hb%ii%dc%ht%ik%ie%hg%hr%hh%dc%ie%hk%\n\
+if%if%hk%hu%hi%dc%hk%hu%dc%if%hj%hg%dc%he%id%\n\
+hv%if%he%hj%dc%hv%hh%dc%if%hj%hg%dc%if%hj%hk%\n\
+ie%dc%hh%hk%hi%dc%if%id%hg%hg%dr%dc%ie%if%hb%\n\
+id%ih%hk%hu%hi%dc%if%hv%dc%hf%hg%hb%if%hj%dr%\n\
+dc%hl%ig%ie%if%dc%hd%hg%he%hb%ig%ie%hg%dc%fk%\n\
+dc%he%hv%ig%hr%hf%hu%di%if%dc%ht%hb%hn%hg%dc%\n\
+ig%ic%dc%ht%ik%dc%ht%hk%hu%hf%dc%ii%hj%hk%he%\n\
+hj%dc%hv%hh%dc%if%hj%hg%dc%hh%hk%hi%ie%dc%fk%\n\
+dc%ii%hv%ig%hr%hf%dc%he%hj%hv%hv%ie%hg%du",
+        expectedOutput: "I saw myself sitting in the crotch of the this fig tree, starving to death, just because I couldn't make up my mind which of the figs I would choose.",
+        recipeConfig: [
+            {
+                "op": "From Modhex",
+                "args": [
+                    "Percent"
+                ]
+            }
+        ]
+
+    },
+    {
+        name: "Mutiline Modhex with semicolon to ASCII (Semi-colon Mode)",
+        input: "fk;dc;ie;hb;ii;dc;ht;ik;ie;hg;hr;hh;dc;ie;hk;\n\
+if;if;hk;hu;hi;dc;hk;hu;dc;if;hj;hg;dc;he;id;\n\
+hv;if;he;hj;dc;hv;hh;dc;if;hj;hg;dc;if;hj;hk;\n\
+ie;dc;hh;hk;hi;dc;if;id;hg;hg;dr;dc;ie;if;hb;\n\
+id;ih;hk;hu;hi;dc;if;hv;dc;hf;hg;hb;if;hj;dr;\n\
+dc;hl;ig;ie;if;dc;hd;hg;he;hb;ig;ie;hg;dc;fk;\n\
+dc;he;hv;ig;hr;hf;hu;di;if;dc;ht;hb;hn;hg;dc;\n\
+ig;ic;dc;ht;ik;dc;ht;hk;hu;hf;dc;ii;hj;hk;he;\n\
+hj;dc;hv;hh;dc;if;hj;hg;dc;hh;hk;hi;ie;dc;fk;\n\
+dc;ii;hv;ig;hr;hf;dc;he;hj;hv;hv;ie;hg;du",
+        expectedOutput: "I saw myself sitting in the crotch of the this fig tree, starving to death, just because I couldn't make up my mind which of the figs I would choose.",
+        recipeConfig: [
+            {
+                "op": "From Modhex",
+                "args": [
+                    "Semi-colon"
+                ]
+            }
+        ]
+
+    },
+    {
+        name: "ASCII to Modhex with comma and line breaks",
+        input: "aberystwyth",
+        expectedOutput: "hb,hd,hg,id,\nik,ie,if,ii,\nik,if,hj",
+        recipeConfig: [
+            {
+                "op": "To Modhex",
+                "args": [
+                    "Comma",
+                    4
+                ]
+            }
+        ]
+    },
+]);

tests/operations/tests/OTP.mjs

@@ -11,12 +11,12 @@ import TestRegister from "../../lib/TestRegister.mjs";
 TestRegister.addTests([
     {
         name: "Generate HOTP",
-        input: "12345678901234567890",
+        input: "JBSWY3DPEHPK3PXP",
-        expectedOutput: "URI: otpauth://hotp/OTPAuthentication?secret=GEZDGNBVGY3TQOJQGEZDGNBVGY3TQOJQ\n\nPassword: 755224",
+        expectedOutput: `URI: otpauth://hotp/?secret=JBSWY3DPEHPK3PXP&algorithm=SHA1&digits=6&counter=0\n\nPassword: 282760`,
         recipeConfig: [
             {
                 op: "Generate HOTP",
-                args: ["", 32, 6, 0],
+                args: ["", 6, 0], // [Name, Code length, Counter]
             },
         ],
     },

tests/operations/tests/Rotate.mjs

@@ -135,10 +135,21 @@ TestRegister.addTests([
             },
         ],
     },
+    {
+        name: "ROT13: no shift amount",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
+        expectedOutput: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [true, true, true, 0]
+            },
+        ],
+    },
     {
         name: "ROT13: normal",
-        input: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
-        expectedOutput: "Gur Dhvpx Oebja Sbk Whzcrq Bire Gur Ynml Qbt.",
+        expectedOutput: "Gur Dhvpx Oebja Sbk Whzcrq Bire Gur Ynml Qbt. 3456789012",
         recipeConfig: [
             {
                 op: "ROT13",
@@ -146,10 +157,21 @@ TestRegister.addTests([
             },
         ],
     },
+    {
+        name: "ROT13: negative shift amount",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
+        expectedOutput: "Gur Dhvpx Oebja Sbk Whzcrq Bire Gur Ynml Qbt. 7890123456",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [true, true, true, -13]
+            },
+        ],
+    },
     {
         name: "ROT13: full loop",
-        input: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
-        expectedOutput: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        expectedOutput: "The Quick Brown Fox Jumped Over The Lazy Dog. 6789012345",
         recipeConfig: [
             {
                 op: "ROT13",
@@ -157,10 +179,21 @@ TestRegister.addTests([
             },
         ],
     },
+    {
+        name: "ROT13: full loop (negative shift amount)",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
+        expectedOutput: "The Quick Brown Fox Jumped Over The Lazy Dog. 4567890123",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [true, true, true, -26]
+            },
+        ],
+    },
     {
         name: "ROT13: lowercase only",
-        input: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
-        expectedOutput: "Tur Qhvpx Bebja Fbk Jhzcrq Oire Tur Lnml Dbt.",
+        expectedOutput: "Tur Qhvpx Bebja Fbk Jhzcrq Oire Tur Lnml Dbt. 0123456789",
         recipeConfig: [
             {
                 op: "ROT13",
@@ -170,8 +203,8 @@ TestRegister.addTests([
     },
     {
         name: "ROT13: uppercase only",
-        input: "The Quick Brown Fox Jumped Over The Lazy Dog.",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
-        expectedOutput: "Ghe Duick Orown Sox Wumped Bver Ghe Yazy Qog.",
+        expectedOutput: "Ghe Duick Orown Sox Wumped Bver Ghe Yazy Qog. 0123456789",
         recipeConfig: [
             {
                 op: "ROT13",
@@ -179,6 +212,50 @@ TestRegister.addTests([
             },
         ],
     },
+    {
+        name: "ROT13: numbers only",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
+        expectedOutput: "The Quick Brown Fox Jumped Over The Lazy Dog. 5678901234",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [false, false, true, 5]
+            },
+        ],
+    },
+    {
+        name: "ROT13: numbers only (negative shift amount)",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
+        expectedOutput: "The Quick Brown Fox Jumped Over The Lazy Dog. 5678901234",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [false, false, true, 5]
+            },
+        ],
+    },
+    {
+        name: "ROT13: numbers only loop",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
+        expectedOutput: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [false, false, true, 10]
+            },
+        ],
+    },
+    {
+        name: "ROT13: numbers only loop (negative shift amount)",
+        input: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
+        expectedOutput: "The Quick Brown Fox Jumped Over The Lazy Dog. 0123456789",
+        recipeConfig: [
+            {
+                op: "ROT13",
+                args: [false, false, true, -10]
+            },
+        ],
+    },
     {
         name: "ROT47: nothing",
         input: "",