Implement RSA generation and signing of messages

src/core/operations/RSASign.mjs

@@ -0,0 +1,60 @@
+/**
+ * @author gchq77703 []
+ * @copyright Crown Copyright 2018
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import forge from "node-forge/dist/forge.min.js";
+
+/**
+ * RSA Sign operation
+ */
+class RSASign extends Operation {
+
+    /**
+     * RSASign constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "RSA Sign";
+        this.module = "Ciphers";
+        this.description = "Sign a plaintext message with a PEM encoded RSA key.";
+        this.infoURL = "https://wikipedia.org/wiki/RSA_(cryptosystem)";
+        this.inputType = "string";
+        this.outputType = "byteArray";
+        this.args = [
+            {
+                name: "RSA Private Key (PEM)",
+                type: "text",
+                value: "-----BEGIN RSA PRIVATE KEY-----"
+            },
+            {
+                name: "Password",
+                type: "text",
+                value: ""
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const [key, password] = args;
+
+        const privateKey = forge.pki.decryptRsaPrivateKey(key, password);
+
+        const md = forge.md.sha1.create();
+        md.update(input, 'utf8');
+        const signature = privateKey.sign(md);
+
+        return signature.split('').map(char => char.charCodeAt());
+    }
+
+}
+
+export default RSASign;