lab12: init

lab12/chatServer.js

@@ -0,0 +1,39 @@
+const net = require('net');
+const eol = require('os').EOL;
+const crypto = require('crypto');
+
+const HASH_ALG = 'sha256';
+const NAME_LEN = 10;
+
+var srvr = net.createServer();
+var clientList = [];
+
+srvr.on('connection', function(client) {
+  client.name = calcName(client.remoteAddress, client.remotePort);
+  client.write('Welcome, ' + client.name + eol);
+
+  //
+  // **YOUR CODE HERE**
+  //
+  // First, add the client to clientList.
+  //
+  // Next, add a listener to the client for a 'data' event.
+  // This event means that the client typed something in.
+  // Broadcast that message to all **other** clients in clientList.
+  //
+  // For extra challenges, try adding the following functionality:
+  // 1) Typing '\list' will list the names of all other users.
+  // 2) Typing '\rename <newname>' will let the user specify a new name for himself/herself.
+  // 3) Typing '\private <name> <msg>' will send a message only to the specified user.
+
+});
+
+function calcName(remoteAddress, remotePort) {
+  let data = remoteAddress + ":" + remotePort;
+  let h = crypto.createHash(HASH_ALG).update(data).digest('hex')
+  return h.substring(0, NAME_LEN);
+}
+
+srvr.listen(9000);
+
+

lab12/keys/alicePriv.txt

@@ -0,0 +1,25 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----

lab12/keys/alicePub.txt

@@ -0,0 +1,7 @@
+-----BEGIN RSA PUBLIC KEY-----
+MIIBCgKCAQEAifK0oKcMmyyCBSSramC4RtcxGNkXUPcs3towqvEAhPisZeXaskG5JnvKTk1t
+dIsDcG9ioUOO3SKo1UwSC1tWf0XZiSxRWDh4fM7m+SoMBHcyE2rAo/EtOtv+hsa9Jsjgq28e
+D9BJZyZJkFrz+pY6hrIQNeLJp4Iq1BlLwzni6Mhea7rBoU0pUG3rrvXMPoG/lPcOC5yibjL2
+fKAojG66ML5nfFDp3Cda/ccs8K6e/89cSwgYQBgz1qntd7djSW8moURrPsDdwhFo6/DmCtds
+4Ct/sCilkGyz6NydK3n1wKk+JiRQlvmCZcOpiy9ywsq+t336Ly8JIIQ8fBdOKvSjAwIDAQAB
+-----END RSA PUBLIC KEY-----

lab12/keys/bobPriv.txt

@@ -0,0 +1,25 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpQIBAAKCAQEA4g5WrWWU+FRbrBbT0J8vADRic+kYkggBFARM3VxWIKOA3o6/6oUi4PIE
+dAocsLmYegL8c/xp/OTP/qpOZdFWOZ4/QgO/9ru9hbCIEUDQ1E3FwDCP835OHAZ7yv75gRD2
+zcxsX95FZnN9Z3InwW3tNr59k97921OIV+Zjc55+HDHjovN+dM29jP72o1zBIRYsJxBSt1Op
+hwkuDGA/IFwDrHqbidrFDR8cgGw6S0OV8TqhOaLmvCwXskJfp3/9uxo0JOO/rxKBU0WaqgU/
+p816qtwVqdHmYkI04WxbihVvMdFFEMdv9l6igJlC6vbVO+qaCVBa17939nyuhexmJQP8IwID
+AQABAoIBAELje0JTjIDudTG2j3Zro7yrw3YIwvxy4d7KZvQZHmMJ/lfcZW0/d9KXyjmLxHGG
+eVehCpJHXhU2n1T7j7cQ+jKSYKVn9qVLaAjm81wnkaNAYAM+W1nxRauFP5wRVkKagmzi0C6N
+1ns6MSEq5hiWLlrEguP+V59OWEmqIkNT4nz0t8iuF7HPaIHIx9X/+tDCRjJT9+y3L7qKkXjm
+CdZf9x8MZCj9PffwjGwLhGUW5PTm140p4g3+KgVkQxDyaJnXmsMJxSrs9x4QTfJtrdtNt+Yv
+jKF+e0kwEiKSKbGBGl/KeaFSA3O8lxMnSswim3/3R09Hwd5DTIaJPafYXjmBsgECgYEA8jRh
+qmhzX09OcKkQOWcUUc6CtV/FL57hlP4t5cWR83ABAWmiagw4JStsnfw75VKo9zl9mlicXyYB
+w4AVJo0eDKaxYn7YF8N441vQtpuvrGayulQg9CdggRfOWulIQH6g48JcpS06TeLAcTMDd6Py
+4I9CzpAb3H/EJty7DNhdl9cCgYEA7u599/UGYIx1QSLADq/oNA3boY6ybkRSh0RhoF9OiDkM
+kdE0di7Bu9AJHBboS+wkgnMH8vA7Vn6LsWslpStylqp+S5hU/845IAj7gHrazm0KRSSKi+XS
+Ijipqz8TJqloptqDpzmC0JtVd3tdTD1RL6yMDePf38UB+sMX7BLGxJUCgYEAmNISOZpUCXQZ
+sx4JPZ7bhE5/zH8UBNsDzKWgQhUp5Obry39iWfVBy7ode4V2KVjBgdQFe0ijyalKfZcoQT3T
+EvpufA46vKu6cAIzq7SJ4IagCM8iR8s8qddifZwp2X/MdkjhedsSqagD8qjUbD3G9oeOCJWG
+7tay5i5p2039p9sCgYEAkvEnlYQijOQ1BH8LoLy8UK8pIN2yjLAGFVyPseKLWKnFOjRwUDKH
+QSs7PwQzjuXGuldmTxlBVPt0jAN6Xm8vBMwL6g/gToYUicgcbLKhuIxE4asMbedEaXlxl3iu
+HXvYea0vhHuRIRw23smG4mlfcbNrWuuG9oahpgevwab2iVUCgYEAj0F7DiCUg2sJsLf1aZfi
+5bjPCqA5oszwyuzB9j6SYDJ15Jprc744u7MdOTcnTVM/5k2hOgjTSWJYm9ghm7V9NAWFpyaP
+2k4IR6686XF3us4Oh+LYNd1YqjgB+XW/cjS6bWtyk/nFJYAw9Ois2mTyuc0wba0xrP/n3oxT
+QyzNeNs=
+-----END RSA PRIVATE KEY-----

lab12/keys/bobPub.txt

@@ -0,0 +1,7 @@
+-----BEGIN RSA PUBLIC KEY-----
+MIIBCgKCAQEA4g5WrWWU+FRbrBbT0J8vADRic+kYkggBFARM3VxWIKOA3o6/6oUi4PIEdAoc
+sLmYegL8c/xp/OTP/qpOZdFWOZ4/QgO/9ru9hbCIEUDQ1E3FwDCP835OHAZ7yv75gRD2zcxs
+X95FZnN9Z3InwW3tNr59k97921OIV+Zjc55+HDHjovN+dM29jP72o1zBIRYsJxBSt1Ophwku
+DGA/IFwDrHqbidrFDR8cgGw6S0OV8TqhOaLmvCwXskJfp3/9uxo0JOO/rxKBU0WaqgU/p816
+qtwVqdHmYkI04WxbihVvMdFFEMdv9l6igJlC6vbVO+qaCVBa17939nyuhexmJQP8IwIDAQAB
+-----END RSA PUBLIC KEY-----

lab12/keys/charliePriv.txt

@@ -0,0 +1,25 @@
+-----BEGIN RSA PRIVATE KEY-----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+Hqf7Nm9bxlDHxj4LrL1PvJniG7Pk3e3eV+NIS8eNeWngEdZCrwDeRBECgYBYQM+e7qorvtpD
+xRMuv1KVt8AbfXZ+k01NmBz3aD4ZgpSMCncm7DyuXG1ANw56BnJU585F7ZAcZiQql5SQJRAJ
+4LoWhyRCYFNSWCnpXuV8dFXdfMfMOG+0O3jTLNkKPFwQ1LHfsawc98FcimkLk9iSJ+oUqMLX
+6GNuTjGzLBLbsQKBgEwglKm/HKQFVy8NmBV5clvJa04LqeBhftp3/H/bkbfVYuBZ5b/y37Qe
+jD4cCtNVhwZxKJJobo8HQQr0szWYYgfTiQgY9bk4XC10+2Nomt8m7/kitUQ6uarjo8BSmePV
+DYeki8/4VQmU5u9nh5UFZCrCVdAPpMRmuHaYqjy7M3aRAoGAVKyUCZnu9AIkmCmuPEvF/7mQ
+88zJ3y8BF44iTjKLquMb4SgK0Hur9EiPcufuzEHMiiHE/m6DPhE8OeV984ZlgwrXXcLvdnDL
+N3lVkTGSNQjRmjK66ITqyTAscc/Hi/W/LzLl0ZjlgynJjtrJQRCIv5tEAaCWeEEY9zS1rD4j
+4Jo=
+-----END RSA PRIVATE KEY-----

lab12/keys/charliePub.txt

@@ -0,0 +1,7 @@
+-----BEGIN RSA PUBLIC KEY-----
+MIIBCgKCAQEAh3tLOaiZvejIsA08OBMqYB4zdn5emWjcJpIHObW8H5jrcj9hpGe1IZ+QBpZ5
+3318aD0uoJPSnOLXcLQR5v8AVdddmwaJr3meaW8PL/J5BPMpDyknxk2GgvZRxXy/eQkvVLXb
+EIRzG5+8Zj8PXkc6rV+qlJEkK/0kuN2y9wz/vYN5z5Fq5qmGnZO665HBh15OxM9b30FliBA/
+DXmD+zK8oR3Gwk3W8GISWmckAqFegZQr9ocY73JHFGTXYmxVbGiWvpmEIuES57bKQX4fg3Xa
+2yQnW8jco48YX6ScPSpVWRiP+56YgAsoojHYr/Evn+fVE4OLqlLrNgWp9UWE6OKqVwIDAQAB
+-----END RSA PUBLIC KEY-----

lab12/signingExample.js

@@ -0,0 +1,51 @@
+var crypto = require('crypto');
+var fs = require('fs');
+var events = require('events');
+
+function Signer(privKeyFile) {
+  // Reads in and stores the private key
+  this.privateKey = fs.readFileSync(privKeyFile).toString('ascii');
+}
+
+Signer.prototype.signMessage = function(messageFileName) {
+  // Read in the file
+  var msg = fs.readFileSync(messageFileName).toString('ascii');
+  // Specify which signing algorithm we want to use
+  var sign = crypto.createSign('RSA-SHA256');
+  // Sign the message and return the signature in hexadecimal form
+  return sign.update(msg).sign(this.privateKey,'hex');
+}
+
+
+function Verifier(pubKeyFile) {
+  // Reads in and stores the public key
+  this.publicKey = fs.readFileSync(pubKeyFile).toString('ascii');
+}
+Verifier.prototype = new events.EventEmitter();
+
+Verifier.prototype.verifySignature = function(messageFileName, signature) {
+  // Read in the file
+  var msg = fs.readFileSync(messageFileName).toString('ascii');
+  // Test the signature
+  var legit = crypto.createVerify('RSA-SHA256').update(msg)
+                   .verify(this.publicKey, signature, 'hex');
+  if (legit) {
+    console.log("Signature is valid");
+  } else {
+    console.log("Invalid signature");
+  }
+}
+
+var verifier = new Verifier('./keys/charliePub.txt');
+Verifier.prototype.on('signing', verifier.verifySignature);
+
+// Valid signing
+var signer = new Signer('./keys/charliePriv.txt');
+var signature = signer.signMessage('./message.txt');
+verifier.emit('signing', './message.txt', signature);
+
+// Wrong signature used
+signer = new Signer('./keys/bobPriv.txt');
+signature = signer.signMessage('./message.txt');
+verifier.emit('signing', './message.txt', signature);
+

lab12/tcpserver.js

@@ -0,0 +1,23 @@
+var net = require('net');
+var eol = require('os').EOL;
+
+var srvr = net.createServer();
+
+srvr.on('connection', function(client) {
+  client.write('Hello there!' + eol);
+  client.end();
+});
+
+srvr.listen(9000);
+
+// node tcpserver.js
+
+/*
+$ telnet 127.0.0.1 9000
+Trying 127.0.0.1...
+Connected to localhost.
+Escape character is '^]'.
+Hello there!
+Connection closed by foreign host.
+*/
+