StealthMessage example

examples/stealthmessage.js

@@ -0,0 +1,53 @@
+var Pubkey = require('../lib/pubkey');
+var Address = require('../lib/address');
+var Stealthkey = require('../lib/expmt/stealthkey');
+var StealthAddress = require('../lib/expmt/stealthaddress');
+var StealthMessage = require('../lib/expmt/stealthmessage');
+var Keypair = require('../lib/keypair')
+
+//First, the person receiving must make a stealth key.
+
+var sk = Stealthkey().fromRandom();
+
+//It has an associated stealth address.
+
+var sa = StealthAddress().fromStealthkey(sk);
+
+console.log('Stealth address: ' + sa);
+
+//The person sending must have a keypair.
+//It is best to make a new one for each message sent.
+
+var keypair = Keypair().fromRandom();
+
+//Now make a message.
+
+var messagebuf = new Buffer('Hello there. Only you know this message is to, and only you know what it says.');
+
+//Encrypt the message with the stealth address.
+
+var encbuf = StealthMessage.encrypt(messagebuf, sa);
+
+console.log('Hex of the encrypted message: ' + encbuf.toString('hex'));
+
+//Note that the first 20 bytes are a pubkeyhash, which may be interpreted as a bitcoin address.
+//This address has never been seen before in public.
+
+var address = Address().set({hashbuf: encbuf.slice(0, 20)});
+
+console.log('The randomly generated address the message is to: ' + address);
+
+//And the next 33 bytes are a nonce public key, which the message is "from".
+//It has never been seen before in public.
+
+var pubkey = Pubkey().fromDER(encbuf.slice(20, 20 + 33));
+
+//The owner of the stealth key can check to see if it is for them.
+
+console.log('Is the message for me? ' + (StealthMessage.isForMe(encbuf, sk) ? "yes" : "no"));
+
+//The owner can decrypt it.
+
+var messagebuf2 = StealthMessage.decrypt(encbuf, sk);
+
+console.log('Decrypted message: ' + messagebuf2.toString());

test/examples.js

@@ -0,0 +1,29 @@
+var should = require('chai').should();
+var fs = require('fs');
+
+describe('Examples', function() {
+
+  var filenames = fs.readdirSync(__dirname + '/../examples/');
+
+  filenames.forEach(function(filename) {
+
+    if (filename.slice(filename.length - 3) === '.js') {
+
+      describe(filename, function() {
+
+        it('should not throw any errors', function() {
+          (function() {
+            var save = console.log;
+            console.log = function() {};
+            require('../examples/' + filename);
+            console.log = save;
+          }).should.not.throw();
+        });
+
+      });
+
+    }
+
+  });
+
+});