RSA Extension

extensions/Themadpunter/rsa.js

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+// Name: RSA
+// ID: themadpunter-rsa
+// Description: Encrypt text and files using RSA, the world's best asymmetric encryption algorithm.
+// By: Themadpunter <https://scratch.mit.edu/users/The_Mad_Punter/>
+// License: MIT
+
+(function(Scratch) {
+    'use strict';
+
+    // Load the JSEncrypt library from a CDN
+    const script = document.createElement('script');
+    script.src = 'https://cdn.jsdelivr.net/npm/jsencrypt/bin/jsencrypt.min.js';
+    document.head.appendChild(script);
+
+    class RSAExtension {
+        getInfo() {
+            return {
+                id: 'themadpunter_rsa',
+                name: 'TurboRSA',
+                color1: '#FF0000', // Primary color (red)
+                color2: '#CC0000', // Secondary color (darker red)
+                blocks: [
+                    {
+                        opcode: 'generateKeys',
+                        blockType: Scratch.BlockType.REPORTER,
+                        text: 'Generate RSA keys',
+                        arguments: {}
+                    },
+                    {
+                        opcode: 'encrypt',
+                        blockType: Scratch.BlockType.REPORTER,
+                        text: 'Encrypt [TEXT] with public key [KEY]',
+                        arguments: {
+                            TEXT: {
+                                type: Scratch.ArgumentType.STRING,
+                                defaultValue: 'Hello, world!'
+                            },
+                            KEY: {
+                                type: Scratch.ArgumentType.STRING,
+                                defaultValue: ''
+                            }
+                        }
+                    },
+                    {
+                        opcode: 'decrypt',
+                        blockType: Scratch.BlockType.REPORTER,
+                        text: 'Decrypt [TEXT] with private key [KEY]',
+                        arguments: {
+                            TEXT: {
+                                type: Scratch.ArgumentType.STRING,
+                                defaultValue: ''
+                            },
+                            KEY: {
+                                type: Scratch.ArgumentType.STRING,
+                                defaultValue: ''
+                            }
+                        }
+                    }
+                ]
+            };
+        }
+
+        generateKeys() {
+            const crypt = new JSEncrypt({ default_key_size: 1024 });
+            const publicKey = crypt.getPublicKeyB64();
+            const privateKey = crypt.getPrivateKeyB64();
+            return JSON.stringify({ publicKey, privateKey });
+        }
+
+        encrypt(args) {
+            const crypt = new JSEncrypt();
+            crypt.setPublicKey(args.KEY);
+            const encrypted = crypt.encrypt(args.TEXT);
+            return encrypted ? encrypted : 'Encryption failed';
+        }
+
+        decrypt(args) {
+            const crypt = new JSEncrypt();
+            crypt.setPrivateKey(args.KEY);
+            const decrypted = crypt.decrypt(args.TEXT);
+            return decrypted ? decrypted : 'Decryption failed';
+        }
+    }
+
+    // Wait for the script to load before registering the extension
+    script.onload = () => {
+        Scratch.extensions.register(new RSAExtension());
+    };
+})(Scratch);