Merge branch 'aes-key-wrap' of https://github.com/mikecat/CyberChef

src/core/config/Categories.json

@@ -132,7 +132,9 @@
             "Typex",
             "Lorenz",
             "Colossus",
-            "SIGABA"
+            "SIGABA",
+            "AES Key Wrap",
+            "AES Key Unwrap"
         ]
     },
     {

src/core/operations/AESKeyUnwrap.mjs

@@ -0,0 +1,128 @@
+/**
+ * @author mikecat
+ * @copyright Crown Copyright 2022
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import Utils from "../Utils.mjs";
+import { toHexFast } from "../lib/Hex.mjs";
+import forge from "node-forge";
+import OperationError from "../errors/OperationError.mjs";
+
+/**
+ * AES Key Unwrap operation
+ */
+class AESKeyUnwrap extends Operation {
+
+    /**
+     * AESKeyUnwrap constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "AES Key Unwrap";
+        this.module = "Ciphers";
+        this.description = "Decryptor for a key wrapping algorithm defined in RFC3394, which is used to protect keys in untrusted storage or communications, using AES.<br><br>This algorithm uses an AES key (KEK: key-encryption key) and a 64-bit IV to decrypt 64-bit blocks.";
+        this.infoURL = "https://wikipedia.org/wiki/Key_wrap";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Key (KEK)",
+                "type": "toggleString",
+                "value": "",
+                "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
+            },
+            {
+                "name": "IV",
+                "type": "toggleString",
+                "value": "a6a6a6a6a6a6a6a6",
+                "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
+            },
+            {
+                "name": "Input",
+                "type": "option",
+                "value": ["Hex", "Raw"]
+            },
+            {
+                "name": "Output",
+                "type": "option",
+                "value": ["Hex", "Raw"]
+            },
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const kek = Utils.convertToByteString(args[0].string, args[0].option),
+            iv = Utils.convertToByteString(args[1].string, args[1].option),
+            inputType = args[2],
+            outputType = args[3];
+
+        if (kek.length !== 16 && kek.length !== 24 && kek.length !== 32) {
+            throw new OperationError("KEK must be either 16, 24, or 32 bytes (currently " + kek.length + " bytes)");
+        }
+        if (iv.length !== 8) {
+            throw new OperationError("IV must be 8 bytes (currently " + iv.length + " bytes)");
+        }
+        const inputData = Utils.convertToByteString(input, inputType);
+        if (inputData.length % 8 !== 0 || inputData.length < 24) {
+            throw new OperationError("input must be 8n (n>=3) bytes (currently " + inputData.length + " bytes)");
+        }
+
+        const cipher = forge.cipher.createCipher("AES-ECB", kek);
+        cipher.start();
+        cipher.update(forge.util.createBuffer(""));
+        cipher.finish();
+        const paddingBlock = cipher.output.getBytes();
+
+        const decipher = forge.cipher.createDecipher("AES-ECB", kek);
+
+        let A = inputData.substring(0, 8);
+        const R = [];
+        for (let i = 8; i < inputData.length; i += 8) {
+            R.push(inputData.substring(i, i + 8));
+        }
+        let cntLower = R.length >>> 0;
+        let cntUpper = (R.length / ((1 << 30) * 4)) >>> 0;
+        cntUpper = cntUpper * 6 + ((cntLower * 6 / ((1 << 30) * 4)) >>> 0);
+        cntLower = cntLower * 6 >>> 0;
+        for (let j = 5; j >= 0; j--) {
+            for (let i = R.length - 1; i >= 0; i--) {
+                const aBuffer = Utils.strToArrayBuffer(A);
+                const aView = new DataView(aBuffer);
+                aView.setUint32(0, aView.getUint32(0) ^ cntUpper);
+                aView.setUint32(4, aView.getUint32(4) ^ cntLower);
+                A = Utils.arrayBufferToStr(aBuffer, false);
+                decipher.start();
+                decipher.update(forge.util.createBuffer(A + R[i] + paddingBlock));
+                decipher.finish();
+                const B = decipher.output.getBytes();
+                A = B.substring(0, 8);
+                R[i] = B.substring(8, 16);
+                cntLower--;
+                if (cntLower < 0) {
+                    cntUpper--;
+                    cntLower = 0xffffffff;
+                }
+            }
+        }
+        if (A !== iv) {
+            throw new OperationError("IV mismatch");
+        }
+        const P = R.join("");
+
+        if (outputType === "Hex") {
+            return toHexFast(Utils.strToArrayBuffer(P));
+        }
+        return P;
+    }
+
+}
+
+export default AESKeyUnwrap;

src/core/operations/AESKeyWrap.mjs

@@ -0,0 +1,115 @@
+/**
+ * @author mikecat
+ * @copyright Crown Copyright 2022
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import Utils from "../Utils.mjs";
+import { toHexFast } from "../lib/Hex.mjs";
+import forge from "node-forge";
+import OperationError from "../errors/OperationError.mjs";
+
+/**
+ * AES Key Wrap operation
+ */
+class AESKeyWrap extends Operation {
+
+    /**
+     * AESKeyWrap constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "AES Key Wrap";
+        this.module = "Ciphers";
+        this.description = "A key wrapping algorithm defined in RFC3394, which is used to protect keys in untrusted storage or communications, using AES.<br><br>This algorithm uses an AES key (KEK: key-encryption key) and a 64-bit IV to encrypt 64-bit blocks.";
+        this.infoURL = "https://wikipedia.org/wiki/Key_wrap";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Key (KEK)",
+                "type": "toggleString",
+                "value": "",
+                "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
+            },
+            {
+                "name": "IV",
+                "type": "toggleString",
+                "value": "a6a6a6a6a6a6a6a6",
+                "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
+            },
+            {
+                "name": "Input",
+                "type": "option",
+                "value": ["Hex", "Raw"]
+            },
+            {
+                "name": "Output",
+                "type": "option",
+                "value": ["Hex", "Raw"]
+            },
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const kek = Utils.convertToByteString(args[0].string, args[0].option),
+            iv = Utils.convertToByteString(args[1].string, args[1].option),
+            inputType = args[2],
+            outputType = args[3];
+
+        if (kek.length !== 16 && kek.length !== 24 && kek.length !== 32) {
+            throw new OperationError("KEK must be either 16, 24, or 32 bytes (currently " + kek.length + " bytes)");
+        }
+        if (iv.length !== 8) {
+            throw new OperationError("IV must be 8 bytes (currently " + iv.length + " bytes)");
+        }
+        const inputData = Utils.convertToByteString(input, inputType);
+        if (inputData.length % 8 !== 0 || inputData.length < 16) {
+            throw new OperationError("input must be 8n (n>=2) bytes (currently " + inputData.length + " bytes)");
+        }
+
+        const cipher = forge.cipher.createCipher("AES-ECB", kek);
+
+        let A = iv;
+        const R = [];
+        for (let i = 0; i < inputData.length; i += 8) {
+            R.push(inputData.substring(i, i + 8));
+        }
+        let cntLower = 1, cntUpper = 0;
+        for (let j = 0; j < 6; j++) {
+            for (let i = 0; i < R.length; i++) {
+                cipher.start();
+                cipher.update(forge.util.createBuffer(A + R[i]));
+                cipher.finish();
+                const B = cipher.output.getBytes();
+                const msbBuffer = Utils.strToArrayBuffer(B.substring(0, 8));
+                const msbView = new DataView(msbBuffer);
+                msbView.setUint32(0, msbView.getUint32(0) ^ cntUpper);
+                msbView.setUint32(4, msbView.getUint32(4) ^ cntLower);
+                A = Utils.arrayBufferToStr(msbBuffer, false);
+                R[i] = B.substring(8, 16);
+                cntLower++;
+                if (cntLower > 0xffffffff) {
+                    cntUpper++;
+                    cntLower = 0;
+                }
+            }
+        }
+        const C = A + R.join("");
+
+        if (outputType === "Hex") {
+            return toHexFast(Utils.strToArrayBuffer(C));
+        }
+        return C;
+    }
+
+}
+
+export default AESKeyWrap;

tests/operations/index.mjs

@@ -128,6 +128,7 @@ import "./tests/NTLM.mjs";
 import "./tests/Shuffle.mjs";
 import "./tests/FletcherChecksum.mjs";
 import "./tests/CMAC.mjs";
+import "./tests/AESKeyWrap.mjs";
 
 // Cannot test operations that use the File type yet
 // import "./tests/SplitColourChannels.mjs";