Add reference client implementation for testing

.gitignore

@@ -105,3 +105,4 @@ dist
 
 lib/*
 *.gpg.key
+*.salt

.idea/jsLibraryMappings.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptLibraryMappings">
+    <includedPredefinedLibrary name="Node.js Core" />
+  </component>
+</project>

test_clients.js

@@ -0,0 +1,47 @@
+const fs = require('fs')
+const openpgp = require('openpgp')
+const bcrypt = require('bcrypt')
+
+class TestClient {
+    constructor(keyName, id) {
+        this.keyName = keyName
+        this.id = id
+        this.publicKey = fs.readFileSync(`./${this.keyName}.public.gpg.key`).toString('utf-8')
+        this.privateKey = fs.readFileSync(`./${this.keyName}.private.gpg.key`).toString('utf-8')
+        this.salt = fs.readFileSync(`./${this.keyName}.salt`).toString('utf-8')
+    }
+
+    getHash(otherClientId) {
+        const [lesserId, greaterId] = [otherClientId, this.id].sort()
+        return bcrypt.hashSync(`${lesserId}-${greaterId}`, this.salt)
+    }
+
+    async interactWith(otherClient) {
+        const hash = this.getHash(otherClient.id)
+        const message = openpgp.Message.fromText(hash)
+        const signature = (await openpgp.sign({
+            message, privateKeys: await openpgp.readKey({
+                armoredKey: this.privateKey
+            })
+        })).toString()
+
+        return {
+            combinedHash: hash,
+            timestamp: (new Date).getTime(),
+            encodedGPSLocation: JSON.stringify({ none: true }),
+            partnerPublicKey: otherClient.publicKey,
+            validationSignature: signature
+        }
+    }
+}
+
+;(async () => {
+    const client_a = new TestClient('test_a', 'a893irwe')
+    const client_b = new TestClient('test_b', 'bawesfdi')
+
+    const a_transact = await client_a.interactWith(client_b)
+    const b_transact = await client_b.interactWith(client_a)
+
+    console.log(a_transact, b_transact)
+})()
+