Merge branch 'rot_bruteforce' of https://github.com/mikecat/CyberChef

src/core/config/Categories.json

@@ -88,7 +88,9 @@
             "SM4 Encrypt",
             "SM4 Decrypt",
             "ROT13",
+            "ROT13 Brute Force",
             "ROT47",
+            "ROT47 Brute Force",
             "XOR",
             "XOR Brute Force",
             "Vigenère Encode",

src/core/operations/ROT13BruteForce.mjs

@@ -0,0 +1,102 @@
+/**
+ * @author MikeCAT
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import Utils from "../Utils.mjs";
+
+/**
+ * ROT13 Brute Force operation.
+ */
+class ROT13BruteForce extends Operation {
+
+    /**
+     * ROT13BruteForce constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "ROT13 Brute Force";
+        this.module = "Default";
+        this.description = "Try all meaningful amounts for ROT13.<br><br>Optionally you can enter your known plaintext (crib) to filter the result.";
+        this.infoURL = "https://wikipedia.org/wiki/ROT13";
+        this.inputType = "byteArray";
+        this.outputType = "string";
+        this.args = [
+            {
+                name: "Rotate lower case chars",
+                type: "boolean",
+                value: true
+            },
+            {
+                name: "Rotate upper case chars",
+                type: "boolean",
+                value: true
+            },
+            {
+                name: "Rotate numbers",
+                type: "boolean",
+                value: false
+            },
+            {
+                "name": "Sample length",
+                "type": "number",
+                "value": 100
+            },
+            {
+                "name": "Sample offset",
+                "type": "number",
+                "value": 0
+            },
+            {
+                "name": "Print amount",
+                "type": "boolean",
+                "value": true
+            },
+            {
+                "name": "Crib (known plaintext string)",
+                "type": "string",
+                "value": ""
+            }
+        ];
+    }
+    
+    /**
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const [rotateLower, rotateUpper, rotateNum, sampleLength, sampleOffset, printAmount, crib] = args;
+        const sample = input.slice(sampleOffset, sampleOffset + sampleLength);
+        const cribLower = crib.toLowerCase();
+        const lowerStart = "a".charCodeAt(0), upperStart = "A".charCodeAt(0), numStart = "0".charCodeAt(0);
+        const result = [];
+        for (let amount = 1; amount < 26; amount++) {
+            const rotated = sample.slice();
+            for (let i = 0; i < rotated.length; i++) {
+                if (rotateLower && lowerStart <= rotated[i] && rotated[i] < lowerStart + 26) {
+                    rotated[i] = (rotated[i] - lowerStart + amount) % 26 + lowerStart;
+                } else if (rotateUpper && upperStart <= rotated[i] && rotated[i] < upperStart + 26) {
+                    rotated[i] = (rotated[i] - upperStart + amount) % 26 + upperStart;
+                } else if (rotateNum && numStart <= rotated[i] && rotated[i] < numStart + 10) {
+                    rotated[i] = (rotated[i] - numStart + amount) % 10 + numStart;
+                }
+            }
+            const rotatedString = Utils.byteArrayToUtf8(rotated);
+            if (rotatedString.toLowerCase().indexOf(cribLower) >= 0) {
+                const rotatedStringPrintable = Utils.printable(rotatedString, false);
+                if (printAmount) {
+                    const amountStr = "Amount = " + (" " + amount).slice(-2) + ": ";
+                    result.push(amountStr + rotatedStringPrintable);
+                } else {
+                    result.push(rotatedStringPrintable);
+                }
+            }
+        }
+        return result.join("\n");
+    }
+}
+
+export default ROT13BruteForce;

src/core/operations/ROT47BruteForce.mjs

@@ -0,0 +1,82 @@
+/**
+ * @author MikeCAT
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import Utils from "../Utils.mjs";
+
+/**
+ * ROT47 Brute Force operation.
+ */
+class ROT47BruteForce extends Operation {
+
+    /**
+     * ROT47BruteForce constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "ROT47 Brute Force";
+        this.module = "Default";
+        this.description = "Try all meaningful amounts for ROT47.<br><br>Optionally you can enter your known plaintext (crib) to filter the result.";
+        this.infoURL = "https://wikipedia.org/wiki/ROT13#Variants";
+        this.inputType = "byteArray";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Sample length",
+                "type": "number",
+                "value": 100
+            },
+            {
+                "name": "Sample offset",
+                "type": "number",
+                "value": 0
+            },
+            {
+                "name": "Print amount",
+                "type": "boolean",
+                "value": true
+            },
+            {
+                "name": "Crib (known plaintext string)",
+                "type": "string",
+                "value": ""
+            }
+        ];
+    }
+    
+    /**
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const [sampleLength, sampleOffset, printAmount, crib] = args;
+        const sample = input.slice(sampleOffset, sampleOffset + sampleLength);
+        const cribLower = crib.toLowerCase();
+        const result = [];
+        for (let amount = 1; amount < 94; amount++) {
+            const rotated = sample.slice();
+            for (let i = 0; i < rotated.length; i++) {
+                if (33 <= rotated[i] && rotated[i] <= 126) {
+                    rotated[i] = (rotated[i] - 33 + amount) % 94 + 33;
+                }
+            }
+            const rotatedString = Utils.byteArrayToUtf8(rotated);
+            if (rotatedString.toLowerCase().indexOf(cribLower) >= 0) {
+                const rotatedStringPrintable = Utils.printable(rotatedString, false);
+                if (printAmount) {
+                    const amountStr = "Amount = " + (" " + amount).slice(-2) + ": ";
+                    result.push(amountStr + rotatedStringPrintable);
+                } else {
+                    result.push(rotatedStringPrintable);
+                }
+            }
+        }
+        return result.join("\n");
+    }
+}
+
+export default ROT47BruteForce;