7.7.3

.eslintrc.json

@@ -51,6 +51,7 @@
             "mode": "minimum"
         }],
         "indent": ["error", 4, {
+            "ignoreComments": true,
             "ArrayExpression": "first",
             "SwitchCase": 1
         }],

README.md

@@ -103,4 +103,4 @@ CyberChef is released under the [Apache 2.0 Licence](https://www.apache.org/lice
   [8]: https://gchq.github.io/CyberChef/#recipe=Fork('%5C%5Cn','%5C%5Cn',false)Conditional_Jump('1',false,'base64',10)To_Hex('Space')Return()Label('base64')To_Base64('A-Za-z0-9%2B/%3D')&input=U29tZSBkYXRhIHdpdGggYSAxIGluIGl0ClNvbWUgZGF0YSB3aXRoIGEgMiBpbiBpdA
   [9]: https://gchq.github.io/CyberChef/#recipe=Register('key%3D(%5B%5C%5Cda-f%5D*)',true,false)Find_/_Replace(%7B'option':'Regex','string':'.*data%3D(.*)'%7D,'$1',true,false,true)RC4(%7B'option':'Hex','string':'$R0'%7D,'Hex','Latin1')&input=aHR0cDovL21hbHdhcmV6LmJpei9iZWFjb24ucGhwP2tleT0wZTkzMmE1YyZkYXRhPThkYjdkNWViZTM4NjYzYTU0ZWNiYjMzNGUzZGIxMQ
   [10]: https://gchq.github.io/CyberChef/#recipe=Register('(.%7B32%7D)',true,false)Drop_bytes(0,32,false)AES_Decrypt(%7B'option':'Hex','string':'1748e7179bd56570d51fa4ba287cc3e5'%7D,%7B'option':'Hex','string':'$R0'%7D,'CTR','Hex','Raw',%7B'option':'Hex','string':''%7D)&input=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
-  [11]: https://gchq.github.io/CyberChef/#recipe=XOR(%7B'option':'Hex','string':'3a'%7D,'',false)To_Hexdump(16,false,false)&input=VGhlIGFuc3dlciB0byB0aGUgdWx0aW1hdGUgcXVlc3Rpb24gb2YgbGlmZSwgdGhlIFVuaXZlcnNlLCBhbmQgZXZlcnl0aGluZyBpcyA0Mi4
+  [11]: https://gchq.github.io/CyberChef/#recipe=XOR(%7B'option':'Hex','string':'3a'%7D,'Standard',false)To_Hexdump(16,false,false)&input=VGhlIGFuc3dlciB0byB0aGUgdWx0aW1hdGUgcXVlc3Rpb24gb2YgbGlmZSwgdGhlIFVuaXZlcnNlLCBhbmQgZXZlcnl0aGluZyBpcyA0Mi4

package.json

@@ -1,6 +1,6 @@
 {
   "name": "cyberchef",
-  "version": "7.6.2",
+  "version": "7.7.3",
   "description": "The Cyber Swiss Army Knife for encryption, encoding, compression and data analysis.",
   "author": "n1474335 <n1474335@gmail.com>",
   "homepage": "https://gchq.github.io/CyberChef",
@@ -33,7 +33,8 @@
     "babel-core": "^6.26.0",
     "babel-loader": "^7.1.2",
     "babel-preset-env": "^1.6.1",
-    "css-loader": "^0.28.7",
+    "css-loader": "^0.28.9",
+    "eslint": "^4.17.0",
     "exports-loader": "^0.6.4",
     "extract-text-webpack-plugin": "^3.0.2",
     "file-loader": "^1.1.6",
@@ -46,7 +47,7 @@
     "grunt-eslint": "^20.1.0",
     "grunt-exec": "~3.0.0",
     "grunt-execute": "^0.2.2",
-    "grunt-jsdoc": "^2.2.0",
+    "grunt-jsdoc": "^2.2.1",
     "grunt-webpack": "^3.0.2",
     "html-webpack-plugin": "^2.30.1",
     "imports-loader": "^0.7.1",
@@ -56,19 +57,19 @@
     "less-loader": "^4.0.5",
     "postcss-css-variables": "^0.8.0",
     "postcss-import": "^11.0.0",
-    "postcss-loader": "^2.0.9",
+    "postcss-loader": "^2.0.10",
     "style-loader": "^0.19.1",
     "url-loader": "^0.6.2",
     "val-loader": "^1.1.0",
-    "web-resource-inliner": "^4.2.0",
+    "web-resource-inliner": "^4.2.1",
     "webpack": "^3.10.0",
-    "webpack-dev-server": "^2.9.7",
+    "webpack-dev-server": "^2.11.1",
     "webpack-node-externals": "^1.6.0",
     "worker-loader": "^1.1.0"
   },
   "dependencies": {
     "babel-polyfill": "^6.26.0",
-    "bignumber.js": "^5.0.0",
+    "bignumber.js": "^6.0.0",
     "bootstrap": "^3.3.7",
     "bootstrap-colorpicker": "^2.5.2",
     "bootstrap-switch": "^3.3.4",
@@ -81,14 +82,14 @@
     "exif-parser": "^0.1.12",
     "file-saver": "^1.3.3",
     "highlight.js": "^9.12.0",
-    "jquery": "^3.2.1",
+    "jquery": "^3.3.1",
     "js-crc": "^0.2.0",
     "js-sha3": "^0.7.0",
     "jsbn": "^1.1.0",
     "jsonpath": "^1.0.0",
     "jsrsasign": "8.0.4",
     "lodash": "^4.17.4",
-    "loglevel": "^1.6.0",
+    "loglevel": "^1.6.1",
     "loglevel-message-prefix": "^3.0.0",
     "moment": "^2.20.1",
     "moment-timezone": "^0.5.14",

src/core/config/Categories.js

@@ -326,6 +326,7 @@ const Categories = [
             "Remove EXIF",
             "Extract EXIF",
             "Numberwang",
+            "XKCD Random Number",
         ]
     },
     {

src/core/config/OperationConfig.js

@@ -2455,7 +2455,7 @@ const OperationConfig = {
         ]
     },
     "Windows Filetime to UNIX Timestamp": {
-        module: "JSBN",
+        module: "Default",
         description: "Converts a Windows Filetime value to a UNIX timestamp.<br><br>A Windows Filetime is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 UTC.<br><br>A UNIX timestamp is a 32-bit value representing the number of seconds since January 1, 1970 UTC (the UNIX epoch).<br><br>This operation also supports UNIX timestamps in milliseconds, microseconds and nanoseconds.",
         inputType: "string",
         outputType: "string",
@@ -2473,7 +2473,7 @@ const OperationConfig = {
         ]
     },
     "UNIX Timestamp to Windows Filetime": {
-        module: "JSBN",
+        module: "Default",
         description: "Converts a UNIX timestamp to a Windows Filetime value.<br><br>A Windows Filetime is a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 UTC.<br><br>A UNIX timestamp is a 32-bit value representing the number of seconds since January 1, 1970 UTC (the UNIX epoch).<br><br>This operation also supports UNIX timestamps in milliseconds, microseconds and nanoseconds.",
         inputType: "string",
         outputType: "string",
@@ -3966,6 +3966,13 @@ const OperationConfig = {
                 value: StrUtils.HAMMING_INPUT_TYPE
             }
         ]
+    },
+    "XKCD Random Number": {
+        module: "Default",
+        description: "RFC 1149.5 specifies 4 as the standard IEEE-vetted random number.<br><br><a href='https://xkcd.com/221/'>XKCD #221</a>",
+        inputType: "string",
+        outputType: "number",
+        args: []
     }
 };
 

src/core/config/modules/Default.js

@@ -10,6 +10,7 @@ import Convert from "../../operations/Convert.js";
 import DateTime from "../../operations/DateTime.js";
 import Endian from "../../operations/Endian.js";
 import Entropy from "../../operations/Entropy.js";
+import Filetime from "../../operations/Filetime.js";
 import FileType from "../../operations/FileType.js";
 import Hexdump from "../../operations/Hexdump.js";
 import HTML from "../../operations/HTML.js";
@@ -28,6 +29,8 @@ import StrUtils from "../../operations/StrUtils.js";
 import Tidy from "../../operations/Tidy.js";
 import Unicode from "../../operations/Unicode.js";
 import UUID from "../../operations/UUID.js";
+import XKCD from "../../operations/XKCD.js";
+
 
 /**
  * Default module.
@@ -39,6 +42,7 @@ import UUID from "../../operations/UUID.js";
  *  - Utils.js
  *  - otp
  *  - crypto
+ *  - bignumber.js
  *
  * @author n1474335 [n1474335@gmail.com]
  * @copyright Crown Copyright 2017
@@ -88,7 +92,7 @@ OpModules.Default = {
     "Bit shift right":      BitwiseOp.runBitShiftRight,
     "XOR":                  BitwiseOp.runXor,
     "XOR Brute Force":      BitwiseOp.runXorBrute,
-    "OR":                   BitwiseOp.runXor,
+    "OR":                   BitwiseOp.runOr,
     "NOT":                  BitwiseOp.runNot,
     "AND":                  BitwiseOp.runAnd,
     "ADD":                  BitwiseOp.runAdd,
@@ -157,6 +161,9 @@ OpModules.Default = {
     "Mean":                 Arithmetic.runMean,
     "Median":               Arithmetic.runMedian,
     "Standard Deviation":   Arithmetic.runStdDev,
+    "Windows Filetime to UNIX Timestamp": Filetime.runFromFiletimeToUnix,
+    "UNIX Timestamp to Windows Filetime": Filetime.runToFiletimeFromUnix,
+    "XKCD Random Number":  XKCD.runRandomNumber,
 
 
     /*

src/core/config/modules/JSBN.js

@@ -1,5 +1,4 @@
 import IP from "../../operations/IP.js";
-import Filetime from "../../operations/Filetime.js";
 
 
 /**
@@ -21,8 +20,6 @@ OpModules.JSBN = {
     "Parse IPv4 header":  IP.runParseIPv4Header,
     "Change IP format":   IP.runChangeIpFormat,
     "Group IP addresses": IP.runGroupIps,
-    "Windows Filetime to UNIX Timestamp": Filetime.runFromFiletimeToUnix,
-    "UNIX Timestamp to Windows Filetime": Filetime.runToFiletimeFromUnix,
 };
 
 export default OpModules;

src/core/operations/BCD.js

@@ -69,7 +69,7 @@ const BCD = {
     runToBCD: function(input, args) {
         if (input.isNaN())
             return "Invalid input";
-        if (!input.floor().equals(input))
+        if (!input.integerValue(BigNumber.ROUND_DOWN).isEqualTo(input))
             return "Fractional values are not supported by BCD";
 
         const encoding = BCD.ENCODING_LOOKUP[args[0]],

src/core/operations/Cipher.js

@@ -555,7 +555,7 @@ DES uses a key length of 8 bytes (64 bits).`;
                 return forge.util.bytesToHex(bytes);
             case "Integer":
                 for (i = bytes.length - 1; i >= 0; i--) {
-                    value = value.mul(256).plus(bytes.charCodeAt(i));
+                    value = value.times(256).plus(bytes.charCodeAt(i));
                 }
                 return value.toFixed();
             case "Byte array":

src/core/operations/Convert.js

@@ -68,7 +68,7 @@ const Convert = {
         let inputUnits = args[0],
             outputUnits = args[1];
 
-        input = input.mul(Convert.DISTANCE_FACTOR[inputUnits]);
+        input = input.times(Convert.DISTANCE_FACTOR[inputUnits]);
         return input.div(Convert.DISTANCE_FACTOR[outputUnits]);
     },
 
@@ -148,7 +148,7 @@ const Convert = {
         let inputUnits = args[0],
             outputUnits = args[1];
 
-        input = input.mul(Convert.DATA_FACTOR[inputUnits]);
+        input = input.times(Convert.DATA_FACTOR[inputUnits]);
         return input.div(Convert.DATA_FACTOR[outputUnits]);
     },
 
@@ -228,7 +228,7 @@ const Convert = {
         let inputUnits = args[0],
             outputUnits = args[1];
 
-        input = input.mul(Convert.AREA_FACTOR[inputUnits]);
+        input = input.times(Convert.AREA_FACTOR[inputUnits]);
         return input.div(Convert.AREA_FACTOR[outputUnits]);
     },
 
@@ -339,7 +339,7 @@ const Convert = {
         let inputUnits = args[0],
             outputUnits = args[1];
 
-        input = input.mul(Convert.MASS_FACTOR[inputUnits]);
+        input = input.times(Convert.MASS_FACTOR[inputUnits]);
         return input.div(Convert.MASS_FACTOR[outputUnits]);
     },
 
@@ -404,7 +404,7 @@ const Convert = {
         let inputUnits = args[0],
             outputUnits = args[1];
 
-        input = input.mul(Convert.SPEED_FACTOR[inputUnits]);
+        input = input.times(Convert.SPEED_FACTOR[inputUnits]);
         return input.div(Convert.SPEED_FACTOR[outputUnits]);
     },
 

src/core/operations/Filetime.js

@@ -1,4 +1,4 @@
-import {BigInteger} from "jsbn";
+import BigNumber from "bignumber.js";
 
 /**
  * Windows Filetime operations.
@@ -35,27 +35,29 @@ const Filetime = {
         let units = args[0],
             format = args[1];
 
+        if (!input) return "";
+
         if (format === "Hex") {
-            input = new BigInteger(input, 16);
+            input = new BigNumber(input, 16);
         } else {
-            input = new BigInteger(input);
+            input = new BigNumber(input);
         }
 
-        input = input.subtract(new BigInteger("116444736000000000"));
+        input = input.minus(new BigNumber("116444736000000000"));
 
         if (units === "Seconds (s)"){
-            input = input.divide(new BigInteger("10000000"));
+            input = input.dividedBy(new BigNumber("10000000"));
         } else if (units === "Milliseconds (ms)") {
-            input = input.divide(new BigInteger("10000"));
+            input = input.dividedBy(new BigNumber("10000"));
         } else if (units === "Microseconds (μs)") {
-            input = input.divide(new BigInteger("10"));
+            input = input.dividedBy(new BigNumber("10"));
         } else if (units === "Nanoseconds (ns)") {
-            input = input.multiply(new BigInteger("100"));
+            input = input.multipliedBy(new BigNumber("100"));
         } else {
             throw "Unrecognised unit";
         }
 
-        return input.toString();
+        return input.toFixed();
     },
 
 
@@ -71,26 +73,28 @@ const Filetime = {
         let units = args[0],
             format = args[1];
 
-        input = new BigInteger(input);
+        if (!input) return "";
+
+        input = new BigNumber(input);
 
         if (units === "Seconds (s)"){
-            input = input.multiply(new BigInteger("10000000"));
+            input = input.multipliedBy(new BigNumber("10000000"));
         } else if (units === "Milliseconds (ms)") {
-            input = input.multiply(new BigInteger("10000"));
+            input = input.multipliedBy(new BigNumber("10000"));
         } else if (units === "Microseconds (μs)") {
-            input = input.multiply(new BigInteger("10"));
+            input = input.multiplyiedBy(new BigNumber("10"));
         } else if (units === "Nanoseconds (ns)") {
-            input = input.divide(new BigInteger("100"));
+            input = input.dividedBy(new BigNumber("100"));
         } else {
             throw "Unrecognised unit";
         }
 
-        input = input.add(new BigInteger("116444736000000000"));
+        input = input.plus(new BigNumber("116444736000000000"));
 
         if (format === "Hex"){
             return input.toString(16);
         } else {
-            return input.toString();
+            return input.toFixed();
         }
     },
 

src/core/operations/Unicode.js

@@ -27,7 +27,7 @@ const Unicode = {
      */
     runUnescape: function(input, args) {
         let prefix = Unicode._prefixToRegex[args[0]],
-            regex = new RegExp(prefix+"([a-f\\d]{4,6})", "ig"),
+            regex = new RegExp(prefix+"([a-f\\d]{4})", "ig"),
             output = "",
             m,
             i = 0;

src/core/operations/XKCD.js

@@ -0,0 +1,26 @@
+/**
+ * XKCD operations.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2018
+ * @license Apache-2.0
+ *
+ * @namespace
+ */
+const XKCD = {
+
+    /**
+     * XKCD Random Number operation.
+     *
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {number}
+     */
+    runRandomNumber: function(input, args) {
+        return 4; // chosen by fair dice roll.
+                  // guaranteed to be random.
+    },
+
+};
+
+export default XKCD;

src/web/HTMLOperation.js

@@ -110,6 +110,15 @@ HTMLOperation.prototype.highlightSearchString = function(searchStr, namePos, des
     }
 
     if (this.description && descPos >= 0) {
+        // Find HTML tag offsets
+        const re = /<[^>]+>/g;
+        let match;
+        while ((match = re.exec(this.description))) {
+            // If the search string occurs within an HTML tag, return without highlighting it.
+            if (descPos >= match.index && descPos <= (match.index + match[0].length))
+                return;
+        }
+
         this.description = this.description.slice(0, descPos) + "<b><u>" +
             this.description.slice(descPos, descPos + searchStr.length) + "</u></b>" +
             this.description.slice(descPos + searchStr.length);

src/web/InputWaiter.js

@@ -1,4 +1,5 @@
 import LoaderWorker from "worker-loader?inline&fallback=false!./LoaderWorker.js";
+import Utils from "../core/Utils.js";
 
 
 /**
@@ -263,11 +264,28 @@ InputWaiter.prototype.handleLoaderMessage = function(e) {
     if (r.hasOwnProperty("fileBuffer")) {
         log.debug("Input file loaded");
         this.fileBuffer = r.fileBuffer;
+        this.displayFilePreview();
         window.dispatchEvent(this.manager.statechange);
     }
 };
 
 
+/**
+ * Shows a chunk of the file in the input behind the file overlay.
+ */
+InputWaiter.prototype.displayFilePreview = function() {
+    const inputText = document.getElementById("input-text"),
+        fileSlice = this.fileBuffer.slice(0, 4096);
+
+    inputText.style.overflow = "hidden";
+    inputText.classList.add("blur");
+    inputText.value = Utils.printable(Utils.arrayBufferToStr(fileSlice));
+    if (this.fileBuffer.byteLength > 4096) {
+        inputText.value += "[truncated]...";
+    }
+};
+
+
 /**
  * Handler for file close events.
  */
@@ -275,6 +293,9 @@ InputWaiter.prototype.closeFile = function() {
     if (this.loaderWorker) this.loaderWorker.terminate();
     this.fileBuffer = null;
     document.getElementById("input-file").style.display = "none";
+    const inputText = document.getElementById("input-text");
+    inputText.style.overflow = "auto";
+    inputText.classList.remove("blur");
 };
 
 

src/web/LoaderWorker.js

@@ -47,7 +47,7 @@ self.loadFile = function(file) {
     };
 
     reader.onerror = function(e) {
-        self.postMessage({"error": file.error.message});
+        self.postMessage({"error": reader.error.message});
     };
 
     seek();

src/web/OutputWaiter.js

@@ -128,6 +128,13 @@ OutputWaiter.prototype.setFile = function(buf) {
 
     fileOverlay.style.display = "block";
     fileSize.textContent = file.size.toLocaleString() + " bytes";
+
+    // Display preview slice in the background
+    const outputText = document.getElementById("output-text"),
+        fileSlice = this.dishBuffer.slice(0, 4096);
+
+    outputText.classList.add("blur");
+    outputText.value = Utils.printable(Utils.arrayBufferToStr(fileSlice));
 };
 
 
@@ -137,6 +144,7 @@ OutputWaiter.prototype.setFile = function(buf) {
 OutputWaiter.prototype.closeFile = function() {
     this.dishBuffer = null;
     document.getElementById("output-file").style.display = "none";
+    document.getElementById("output-text").classList.remove("blur");
 };
 
 
@@ -163,6 +171,7 @@ OutputWaiter.prototype.displayFileSlice = function() {
         sliceTo = parseInt(sliceToEl.value, 10),
         str = Utils.arrayBufferToStr(this.dishBuffer.slice(sliceFrom, sliceTo));
 
+    document.getElementById("output-text").classList.remove("blur");
     showFileOverlay.style.display = "block";
     this.set(str, "string", new Date().getTime() - startTime, true);
 };
@@ -177,6 +186,7 @@ OutputWaiter.prototype.showFileOverlayClick = function(e) {
     const outputFile = document.getElementById("output-file"),
         showFileOverlay = e.target;
 
+    document.getElementById("output-text").classList.add("blur");
     outputFile.style.display = "block";
     showFileOverlay.style.display = "none";
     this.setOutputInfo(this.dishBuffer.byteLength, null, 0);

src/web/html/index.html

@@ -183,8 +183,9 @@
                         </div>
                         <div class="textarea-wrapper no-select">
                             <div id="input-highlighter" class="no-select"></div>
-                            <textarea id="input-text"></textarea>
+                            <textarea id="input-text" spellcheck="false"></textarea>
                             <div id="input-file">
+                                <div class="file-overlay"></div>
                                 <div style="position: relative; height: 100%;">
                                     <div class="card">
                                         <img aria-hidden="true" src="<%- require('../static/images/file-128x128.png') %>" alt="File icon"/>
@@ -218,9 +219,10 @@
                         <div class="textarea-wrapper">
                             <div id="output-highlighter" class="no-select"></div>
                             <div id="output-html"></div>
-                            <textarea id="output-text" readonly="readonly"></textarea>
+                            <textarea id="output-text" readonly="readonly" spellcheck="false"></textarea>
                             <img id="show-file-overlay" aria-hidden="true" src="<%- require('../static/images/file-32x32.png') %>" alt="Show file overlay" title="Show file overlay"/>
                             <div id="output-file">
+                                <div class="file-overlay"></div>
                                 <div style="position: relative; height: 100%;">
                                     <div class="card">
                                         <img aria-hidden="true" src="<%- require('../static/images/file-128x128.png') %>" alt="File icon"/>
@@ -233,7 +235,7 @@
                                                 </span>
                                                 <input type="number" class="form-control" id="output-file-slice-from" placeholder="From" value="0" step="1024" min="0">
                                                 <div class="input-group-addon">to</div>
-                                                <input type="number" class="form-control" id="output-file-slice-to" placeholder="To" value="1024" step="1024" min="0">
+                                                <input type="number" class="form-control" id="output-file-slice-to" placeholder="To" value="2048" step="1024" min="0">
                                             </div>
                                         </div>
                                     </div>

src/web/stylesheets/layout/_io.css

@@ -84,10 +84,17 @@
     top: 0;
     width: 100%;
     height: 100%;
-    background-color: var(--title-background-colour);
     display: none;
 }
 
+.file-overlay {
+    position: absolute;
+    opacity: 0.8;
+    background-color: var(--title-background-colour);
+    width: 100%;
+    height: 100%;
+}
+
 #show-file-overlay {
     position: absolute;
     right: 15px;