Converted DES and TripleDES ops

2025-04-21 23:36:16 -04:00 · 2018-05-23 18:23:03 +01:00 · 2018-05-23 18:23:03 +01:00 · 46b8b2fa7e
commit 46b8b2fa7e
parent 189e077247
5 changed files with 363 additions and 324 deletions
--- a/src/core/operations/DESDecrypt.mjs
+++ b/src/core/operations/DESDecrypt.mjs
@ -0,0 +1,92 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import Utils from "../Utils";
+import forge from "node-forge/dist/forge.min.js";
+
+/**
+ * DES Decrypt operation
+ */
+class DESDecrypt extends Operation {
+
+    /**
+     * DESDecrypt constructor
+     */
+    constructor() {
+        super();
+
+        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.";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Key",
+                "type": "toggleString",
+                "value": "",
+                "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
+            },
+            {
+                "name": "IV",
+                "type": "toggleString",
+                "value": "",
+                "toggleValues": ["Hex", "UTF8", "Latin1", "Base64"]
+            },
+            {
+                "name": "Mode",
+                "type": "option",
+                "value": ["CBC", "CFB", "OFB", "CTR", "ECB"]
+            },
+            {
+                "name": "Input",
+                "type": "option",
+                "value": ["Hex", "Raw"]
+            },
+            {
+                "name": "Output",
+                "type": "option",
+                "value": ["Raw", "Hex"]
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const key = Utils.convertToByteString(args[0].string, args[0].option),
+            iv = Utils.convertToByteArray(args[1].string, args[1].option),
+            mode = args[2],
+            inputType = args[3],
+            outputType = args[4];
+
+        if (key.length !== 8) {
+            return `Invalid key length: ${key.length} bytes
+DES uses a key length of 8 bytes (64 bits).
+Triple DES uses a key length of 24 bytes (192 bits).`;
+        }
+
+        input = Utils.convertToByteString(input, inputType);
+
+        const decipher = forge.cipher.createDecipher("DES-" + mode, key);
+        decipher.start({iv: iv});
+        decipher.update(forge.util.createBuffer(input));
+        const result = decipher.finish();
+
+        if (result) {
+            return outputType === "Hex" ? decipher.output.toHex() : decipher.output.getBytes();
+        } else {
+            return "Unable to decrypt input with these parameters.";
+        }
+    }
+
+}
+
+export default DESDecrypt;