From c1176193f0ba31b097d505f0bbe1e70c6979a6ed Mon Sep 17 00:00:00 2001
From: ron <ron@qed-it.com>
Date: Fri, 26 Jul 2019 15:45:25 +0300
Subject: [PATCH 1/6] make page interactive

---
 demo/index.html                  |  64 ++++++++-----
 demo/scripts/index.js            | 159 ++++++++++++++++++++++++-------
 demo/styles/font-awesome.min.css |   4 +
 demo/webpack.config.js           |   2 +-
 4 files changed, 171 insertions(+), 58 deletions(-)
 create mode 100644 demo/styles/font-awesome.min.css

diff --git a/demo/index.html b/demo/index.html
index 341e0dc..66f4f63 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -9,7 +9,10 @@
     <!-- Bootstrap core CSS -->
 <link href="bootstrap.min.css" rel="stylesheet" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
 
+<link href="font-awesome.min.css" rel="stylesheet" crossorigin="anonymous">
+
     <style>
+
       .bd-placeholder-img {
         font-size: 1.125rem;
         text-anchor: middle;
@@ -67,6 +70,7 @@ <h1 class="display-4 font-weight-normal pb-5">ZkInterface:<br/>ZoKrates ➞ Bull
 
   <!-- <div class="product-device shadow-sm d-none d-md-block"></div> -->
   <!--   <div class="product-device product-device-2 shadow-sm d-none d-md-block"></div> -->
+
 </div>
 
 <div class="position-relative overflow-hidden px-3 px-lg-5 m-lg-3 bg-light">
@@ -147,19 +151,34 @@ <h2 class="display-5">Zero-knowledge Program</h2>
       id="program">
       _
     </code></pre>
-  </div>
+
+    <div class="btn-group btn-block" role="group" aria-label="Basic example">
+        <button type="button" id="computeWitnessBtn" class="btn btn-secondary btn-warning btn-lg">&nbsp; Compute Witness &nbsp;<i class="fa fa-chevron-down fa-fw" aria-hidden="true"></i>
+        </button>
+        <button type="button" id="generateConstraintsBtn" class="btn btn-secondary btn-warning btn-lg">&nbsp; Generate constraints &nbsp;<i class="fa fa-chevron-right fa-fw" aria-hidden="true"></i>
+        </button>
+      </div>
+
+ <!--
+    <button type="button" id="generateConstraintsBtn" class="btn btn-warning btn-lg btn-block">Generate constraints</button>
+  -->
+
+</div>
 
   <div class="border-dark-q arrow-right my-auto"></div>
 
   <div class="bg-light-q mr-md-3 p-3 p-md-5 overflow-hidden">
-    <div class="text-center mb-3 pb-3">
-      <h2 class="display-5">Prover's View</h2>
-      <p class="lead">A private witness is used to generate a proof.</p>
-    </div>
-    <pre class="code-block bg-dark-q text-white shadow-sm mx-auto"><code
-      id="prover">
-      _
-    </code></pre>
+
+      <div class="text-center mb-3 pb-3">
+          <h2 class="display-5">Constraint System</h2>
+          <p class="lead">
+            The program is compiled into a common R1CS form.
+          </p>
+        </div>
+        <pre class="code-block bg-dark-q text-white shadow-sm mx-auto"><code
+          id="cs">
+          _
+        </code></pre>
   </div>
 </div>
 
@@ -176,16 +195,17 @@ <h2 class="display-5">Prover's View</h2>
 <div class="d-md-flex flex-md-equal w-100 mb-md-3 pl-md-3">
 
   <div class="bg-light-q p-3 p-md-5 overflow-hidden">
-    <div class="text-center mb-3 pb-3">
-      <h2 class="display-5">Constraint System</h2>
-      <p class="lead">
-        The program is compiled into a common R1CS form.
-      </p>
-    </div>
-    <pre class="code-block bg-dark-q text-white shadow-sm mx-auto"><code
-      id="cs">
-      _
-    </code></pre>
+        
+      <div class="text-center mb-3 pb-3">
+          <h2 class="display-5">Prover's View</h2>
+          <p class="lead">A private witness is used to generate a proof.</p>
+        </div>
+        <pre class="code-block bg-dark-q text-white shadow-sm mx-auto"><code
+          id="prover">
+          _
+        </code></pre>
+        <button type="button" id="createProofBtn" class="btn btn-warning btn-lg btn-block">Generate proof</button>
+
   </div>
 
   <div class="border-dark-q arrow-right my-auto"></div>
@@ -201,13 +221,13 @@ <h2 class="display-5">Verifier's View</h2>
       </code>
 
 <span id="status"></span></pre>
+<button type="button" id="verifyProofBtn" class="btn btn-warning btn-lg btn-block">Verify proof</button>
   </div>
+
 </div>
 
+
 <!-- Separator -->
 <div class="position-relative m-5 p-5"></div>
 
-<!-- <script src="node_modules/jquery/dist/jquery.slim.min.js" integrity="sha256-pasqAKBDmFT4eHoN2ndd6lN370kFiGUFyTiUHWhU7k8=" crossorigin="anonymous"></script>
-<script src="node_modules/bootstrap/dist/js/bootstrap.bundle.min.js" integrity="sha384-xrRywqdh3PHs8keKZN+8zzc5TX0GRTLCcmivcbNJWm2rs5C8PRhcEn3czEjhAO9o" crossorigin="anonymous"></script> -->
-
 </body></html>
\ No newline at end of file
diff --git a/demo/scripts/index.js b/demo/scripts/index.js
index 0d7954e..e7a6689 100644
--- a/demo/scripts/index.js
+++ b/demo/scripts/index.js
@@ -1,52 +1,141 @@
 import * as zkif_zokrates from "../pkg/zkif-wasm-zokrates";
 import * as zkif_bulletproofs from "../pkg/zkif-wasm-bulletproofs";
 
+// global vars:
+var prover_msg, verifier_msg, proof, constraints;
+var x = 3, y = 4;
+
 // Common program.
 let code = `
+    def main(field x, private field y) -> (field):
+        field xx = x * x
+        field yy = y * y
+        return xx + yy - 1
 
-def main(field x, private field y) -> (field):
-    field xx = x * x
-    field yy = y * y
-    return xx + yy - 1
-
-`;
+    `;
+    
 document.getElementById("program").innerText = code.trim();
 
-// Compile the code to ZkInterface constraints with the ZoKrates module.
-let constraints = zkif_zokrates.make_constraint_system(code);
-document.getElementById("cs").innerText = zkif_zokrates.pretty(constraints).trim();
+document.getElementById("generateConstraintsBtn").addEventListener("click", generateConstraints); 
+
+function generateConstraints (){
+    console.log("generateConstraints invoked");
+
+    var programCode = document.getElementById("program").innerText;
+    console.log("programCode, programCode: " + programCode);
+
+    // Compile the code to ZkInterface constraints with the ZoKrates module.
+    constraints = zkif_zokrates.make_constraint_system(programCode);
+    console.log("generated constraints, constraints: " + constraints);
+    document.getElementById("cs").innerText = zkif_zokrates.pretty(constraints).trim();
+
+    console.log("generateConstraints finished");
+
+}
 
-// Prover's View.
+document.getElementById("computeWitnessBtn").addEventListener("click", computeWitness); 
 
-// Compute the ZkInterface witness with the ZoKrates module.
-let x = 3, y = 4;
-let {prover_msg, verifier_msg} = zkif_zokrates.make_witness(code, x, y);
+function computeWitness(){
+    console.log("computeWitness invoked");
+    // Prover's View.
 
-// Generate a proof with the Bulletproofs module.
-let proof = zkif_bulletproofs.prove(constraints, prover_msg);
+    console.log("input parameter, code: " + code);
+    console.log("x: " + x);
+    console.log("y: " + y);
 
-// Display.
-document.getElementById("prover").innerText = `
-x = ${x}, y = ${y}
-${zkif_zokrates.pretty(prover_msg)}
-`.trim();
+    // Compute the ZkInterface witness with the ZoKrates module.
+    let {prover_msg_tmp, verifier_msg_tmp} = zkif_zokrates.make_witness(code, x, y);
 
-// Prover sends verifier_msg and proof to the verifier.
-document.getElementById("verifier").innerText = `
-${zkif_zokrates.pretty(verifier_msg)}
-Verifying proof (${proof.length} bytes)
-`.trim();
+    console.log("output parameter, prover_msg_tmp: " + prover_msg_tmp);
+    console.log("output parameter, verifier_msg_tmp: " + verifier_msg_tmp);
 
-// Verify the proof using the Bulletproofs module and the messages.
-let verif = zkif_bulletproofs.verify(constraints, verifier_msg, proof);
+    prover_msg = prover_msg_tmp;
+    verifier_msg = verifier_msg_tmp;
 
-// Display what we verified.
-function statement(msg) {
-    let public_inputs = zkif_zokrates.parse_verifier_msg(msg);
-    let x = public_inputs[1][0];
-    let zz = public_inputs[2][0];
-    return `${x}^2 + y^2 = ${zz}`
+    // Display.
+    document.getElementById("prover").innerText = `
+    x = ${x}, y = ${y}
+    ${zkif_zokrates.pretty(prover_msg)}
+    `.trim();
+
+    console.log("computeWitness finished");
 }
 
-let status = `The statement is ${verif && "proven" || "NOT proven"}:  ${statement(verifier_msg)}`;
-document.getElementById("status").innerText = status;
+document.getElementById("createProofBtn").addEventListener("click", createProof); 
+
+function createProof(){
+    console.log("createProof invoked");
+
+    console.log("input parameter constraints value: " + constraints);
+    console.log("input parameter prover_msg value: " + prover_msg);
+
+    if (!constraints) {
+        window.alert("constraints are empty, please generate constraints first.");
+        return;
+    }
+    
+    if (!prover_msg) {
+        window.alert("witness is empty, please compute witness first.");
+        return;
+    }
+
+    // Generate a proof with the Bulletproofs module.
+    proof = zkif_bulletproofs.prove(constraints, prover_msg);
+    console.log("output parameter proof value: " + proof);
+
+    document.getElementById("verifier").innerText = `
+    Proof created. (${proof.length} bytes)
+    `
+
+    console.log("createProof finished");
+}
+
+document.getElementById("verifyProofBtn").addEventListener("click", verifyProof); 
+
+function verifyProof(){
+    console.log("computeWitness invoked");
+    console.log("input parameter, verifier_msg: " + verifier_msg);
+    console.log("input parameter, proof: " + proof);
+    console.log("input parameter, constraints: " + constraints);
+
+    if (!verifier_msg) {
+        window.alert("witness is empty, please compute witness first.");
+        return;
+    }
+
+    if (!proof) {
+        window.alert("proof is empty, please create proof first.");
+        return;
+    }
+
+    if (!constraints) {
+        window.alert("constraints are empty, please generate constraints first.");
+        return;
+    }
+
+    // Prover sends verifier_msg and proof to the verifier.
+    document.getElementById("verifier").insertAdjacentText("beforeend",`
+    ${zkif_zokrates.pretty(verifier_msg)}
+    Verifying proof (${proof.length} bytes)
+    `.trim());
+
+    // Verify the proof using the Bulletproofs module and the messages.
+    let verif = zkif_bulletproofs.verify(constraints, verifier_msg, proof);
+
+    // Display what we verified.
+    function statement(msg) {
+        let public_inputs = zkif_zokrates.parse_verifier_msg(msg);
+        let x = public_inputs[1][0];
+        let zz = public_inputs[2][0];
+        return `${x}^2 + y^2 = ${zz}`
+    }
+
+    let status = `The statement is ${verif && "proven" || "NOT proven"}:  ${statement(verifier_msg)}`;
+    document.getElementById("status").innerText = status;
+
+    console.log("output parameter verif value: " + verif);
+    console.log("output parameter proof value: " + proof);
+
+    console.log("verifyProof finished");
+
+}
diff --git a/demo/styles/font-awesome.min.css b/demo/styles/font-awesome.min.css
new file mode 100644
index 0000000..540440c
--- /dev/null
+++ b/demo/styles/font-awesome.min.css
@@ -0,0 +1,4 @@
+/*!
+ *  Font Awesome 4.7.0 by @davegandy - http://fontawesome.io - @fontawesome
+ *  License - http://fontawesome.io/license (Font: SIL OFL 1.1, CSS: MIT License)
+ */@font-face{font-family:'FontAwesome';src:url('../fonts/fontawesome-webfont.eot?v=4.7.0');src:url('../fonts/fontawesome-webfont.eot?#iefix&v=4.7.0') format('embedded-opentype'),url('../fonts/fontawesome-webfont.woff2?v=4.7.0') format('woff2'),url('../fonts/fontawesome-webfont.woff?v=4.7.0') format('woff'),url('../fonts/fontawesome-webfont.ttf?v=4.7.0') format('truetype'),url('../fonts/fontawesome-webfont.svg?v=4.7.0#fontawesomeregular') format('svg');font-weight:normal;font-style:normal}.fa{display:inline-block;font:normal normal normal 14px/1 FontAwesome;font-size:inherit;text-rendering:auto;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.fa-lg{font-size:1.33333333em;line-height:.75em;vertical-align:-15%}.fa-2x{font-size:2em}.fa-3x{font-size:3em}.fa-4x{font-size:4em}.fa-5x{font-size:5em}.fa-fw{width:1.28571429em;text-align:center}.fa-ul{padding-left:0;margin-left:2.14285714em;list-style-type:none}.fa-ul>li{position:relative}.fa-li{position:absolute;left:-2.14285714em;width:2.14285714em;top:.14285714em;text-align:center}.fa-li.fa-lg{left:-1.85714286em}.fa-border{padding:.2em .25em .15em;border:solid .08em #eee;border-radius:.1em}.fa-pull-left{float:left}.fa-pull-right{float:right}.fa.fa-pull-left{margin-right:.3em}.fa.fa-pull-right{margin-left:.3em}.pull-right{float:right}.pull-left{float:left}.fa.pull-left{margin-right:.3em}.fa.pull-right{margin-left:.3em}.fa-spin{-webkit-animation:fa-spin 2s infinite linear;animation:fa-spin 2s infinite linear}.fa-pulse{-webkit-animation:fa-spin 1s infinite steps(8);animation:fa-spin 1s infinite steps(8)}@-webkit-keyframes fa-spin{0%{-webkit-transform:rotate(0deg);transform:rotate(0deg)}100%{-webkit-transform:rotate(359deg);transform:rotate(359deg)}}@keyframes fa-spin{0%{-webkit-transform:rotate(0deg);transform:rotate(0deg)}100%{-webkit-transform:rotate(359deg);transform:rotate(359deg)}}.fa-rotate-90{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=1)";-webkit-transform:rotate(90deg);-ms-transform:rotate(90deg);transform:rotate(90deg)}.fa-rotate-180{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=2)";-webkit-transform:rotate(180deg);-ms-transform:rotate(180deg);transform:rotate(180deg)}.fa-rotate-270{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=3)";-webkit-transform:rotate(270deg);-ms-transform:rotate(270deg);transform:rotate(270deg)}.fa-flip-horizontal{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=0, mirror=1)";-webkit-transform:scale(-1, 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ew:before{content:"\f21d"}.fa-heartbeat:before{content:"\f21e"}.fa-venus:before{content:"\f221"}.fa-mars:before{content:"\f222"}.fa-mercury:before{content:"\f223"}.fa-intersex:before,.fa-transgender:before{content:"\f224"}.fa-transgender-alt:before{content:"\f225"}.fa-venus-double:before{content:"\f226"}.fa-mars-double:before{content:"\f227"}.fa-venus-mars:before{content:"\f228"}.fa-mars-stroke:before{content:"\f229"}.fa-mars-stroke-v:before{content:"\f22a"}.fa-mars-stroke-h:before{content:"\f22b"}.fa-neuter:before{content:"\f22c"}.fa-genderless:before{content:"\f22d"}.fa-facebook-official:before{content:"\f230"}.fa-pinterest-p:before{content:"\f231"}.fa-whatsapp:before{content:"\f232"}.fa-server:before{content:"\f233"}.fa-user-plus:before{content:"\f234"}.fa-user-times:before{content:"\f235"}.fa-hotel:before,.fa-bed:before{content:"\f236"}.fa-viacoin:before{content:"\f237"}.fa-train:before{content:"\f238"}.fa-subway:before{content:"\f239"}.fa-medium:before{content:"\f23a"}.fa-yc:before,.fa-y-combinator:before{content:"\f23b"}.fa-optin-monster:before{content:"\f23c"}.fa-opencart:before{content:"\f23d"}.fa-expeditedssl:before{content:"\f23e"}.fa-battery-4:before,.fa-battery:before,.fa-battery-full:before{content:"\f240"}.fa-battery-3:before,.fa-battery-three-quarters:before{content:"\f241"}.fa-battery-2:before,.fa-battery-half:before{content:"\f242"}.fa-battery-1:before,.fa-battery-quarter:before{content:"\f243"}.fa-battery-0:before,.fa-battery-empty:before{content:"\f244"}.fa-mouse-pointer:before{content:"\f245"}.fa-i-cursor:before{content:"\f246"}.fa-object-group:before{content:"\f247"}.fa-object-ungroup:before{content:"\f248"}.fa-sticky-note:before{content:"\f249"}.fa-sticky-note-o:before{content:"\f24a"}.fa-cc-jcb:before{content:"\f24b"}.fa-cc-diners-club:before{content:"\f24c"}.fa-clone:before{content:"\f24d"}.fa-balance-scale:before{content:"\f24e"}.fa-hourglass-o:before{content:"\f250"}.fa-hourglass-1:before,.fa-hourglass-start:before{content:"\f251"}.fa-hourglass-2:before,.fa-hourglass-half:before{content:"\f252"}.fa-hourglass-3:before,.fa-hourglass-end:before{content:"\f253"}.fa-hourglass:before{content:"\f254"}.fa-hand-grab-o:before,.fa-hand-rock-o:before{content:"\f255"}.fa-hand-stop-o:before,.fa-hand-paper-o:before{content:"\f256"}.fa-hand-scissors-o:before{content:"\f257"}.fa-hand-lizard-o:before{content:"\f258"}.fa-hand-spock-o:before{content:"\f259"}.fa-hand-pointer-o:before{content:"\f25a"}.fa-hand-peace-o:before{content:"\f25b"}.fa-trademark:before{content:"\f25c"}.fa-registered:before{content:"\f25d"}.fa-creative-commons:before{content:"\f25e"}.fa-gg:before{content:"\f260"}.fa-gg-circle:before{content:"\f261"}.fa-tripadvisor:before{content:"\f262"}.fa-odnoklassniki:before{content:"\f263"}.fa-odnoklassniki-square:before{content:"\f264"}.fa-get-pocket:before{content:"\f265"}.fa-wikipedia-w:before{content:"\f266"}.fa-safari:before{content:"\f267"}.fa-chrome:before{content:"\f268"}.fa-firefox:before{content:"\f269"}.fa-opera:before{content:"\f26a"}.fa-internet-explorer:before{content:"\f26b"}.fa-tv:before,.fa-television:before{content:"\f26c"}.fa-contao:before{content:"\f26d"}.fa-500px:before{content:"\f26e"}.fa-amazon:before{content:"\f270"}.fa-calendar-plus-o:before{content:"\f271"}.fa-calendar-minus-o:before{content:"\f272"}.fa-calendar-times-o:before{content:"\f273"}.fa-calendar-check-o:before{content:"\f274"}.fa-industry:before{content:"\f275"}.fa-map-pin:before{content:"\f276"}.fa-map-signs:before{content:"\f277"}.fa-map-o:before{content:"\f278"}.fa-map:before{content:"\f279"}.fa-commenting:before{content:"\f27a"}.fa-commenting-o:before{content:"\f27b"}.fa-houzz:before{content:"\f27c"}.fa-vimeo:before{content:"\f27d"}.fa-black-tie:before{content:"\f27e"}.fa-fonticons:before{content:"\f280"}.fa-reddit-alien:before{content:"\f281"}.fa-edge:before{content:"\f282"}.fa-credit-card-alt:before{content:"\f283"}.fa-codiepie:before{content:"\f284"}.fa-modx:before{content:"\f285"}.fa-fort-awesome:before{content:"\f286"}.fa-usb:before{content:"\f287"}.fa-product-hunt:before{content:"\f288"}.fa-mixcloud:before{content:"\f289"}.fa-scribd:before{content:"\f28a"}.fa-pause-circle:before{content:"\f28b"}.fa-pause-circle-o:before{content:"\f28c"}.fa-stop-circle:before{content:"\f28d"}.fa-stop-circle-o:before{content:"\f28e"}.fa-shopping-bag:before{content:"\f290"}.fa-shopping-basket:before{content:"\f291"}.fa-hashtag:before{content:"\f292"}.fa-bluetooth:before{content:"\f293"}.fa-bluetooth-b:before{content:"\f294"}.fa-percent:before{content:"\f295"}.fa-gitlab:before{content:"\f296"}.fa-wpbeginner:before{content:"\f297"}.fa-wpforms:before{content:"\f298"}.fa-envira:before{content:"\f299"}.fa-universal-access:before{content:"\f29a"}.fa-wheelchair-alt:before{content:"\f29b"}.fa-question-circle-o:before{content:"\f29c"}.fa-blind:before{content:"\f29d"}.fa-audio-description:before{content:"\f29e"}.fa-volume-control-phone:before{content:"\f2a0"}.fa-braille:before{content:"\f2a1"}.fa-assistive-listening-systems:be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0, 0, 0);border:0}.sr-only-focusable:active,.sr-only-focusable:focus{position:static;width:auto;height:auto;margin:0;overflow:visible;clip:auto}
diff --git a/demo/webpack.config.js b/demo/webpack.config.js
index cc18d54..ead53ae 100644
--- a/demo/webpack.config.js
+++ b/demo/webpack.config.js
@@ -9,6 +9,6 @@ module.exports = {
   },
   mode: "development",
   plugins: [
-    new CopyWebpackPlugin(['index.html', "node_modules/bootstrap/dist/css/bootstrap.min.css", "styles/index.css", "styles/presented_by_qedit.svg"])
+    new CopyWebpackPlugin(['index.html', "node_modules/bootstrap/dist/css/bootstrap.min.css", "styles/index.css", "styles/presented_by_qedit.svg", "styles/font-awesome.min.css"])
   ],
 };

From 32e438d03df8071cf8bf60ea1dab6c141e061075 Mon Sep 17 00:00:00 2001
From: ron <ron@qed-it.com>
Date: Sun, 28 Jul 2019 14:01:45 +0300
Subject: [PATCH 2/6] feat: add prints for debuging

---
 demo/index.html                  |  4 ++--
 demo/package-lock.json           | 41 +++++++++++++++++++++++---------
 demo/scripts/index.js            |  9 +++----
 demo/styles/font-awesome.min.css |  4 ----
 demo/webpack.config.js           |  2 +-
 5 files changed, 36 insertions(+), 24 deletions(-)
 delete mode 100644 demo/styles/font-awesome.min.css

diff --git a/demo/index.html b/demo/index.html
index 66f4f63..0c33a27 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -9,8 +9,8 @@
     <!-- Bootstrap core CSS -->
 <link href="bootstrap.min.css" rel="stylesheet" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
 
-<link href="font-awesome.min.css" rel="stylesheet" crossorigin="anonymous">
-
+<!-- <link href="font-awesome.min.css" rel="stylesheet" crossorigin="anonymous"> -->
+<link href="//netdna.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet">
     <style>
 
       .bd-placeholder-img {
diff --git a/demo/package-lock.json b/demo/package-lock.json
index 4f7c949..cb2a298 100644
--- a/demo/package-lock.json
+++ b/demo/package-lock.json
@@ -2123,7 +2123,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -2144,12 +2145,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -2164,17 +2167,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -2291,7 +2297,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -2303,6 +2310,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -2317,6 +2325,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -2324,12 +2333,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -2348,6 +2359,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -2428,7 +2440,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -2440,6 +2453,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -2525,7 +2539,8 @@
         "safe-buffer": {
           "version": "5.1.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -2561,6 +2576,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -2580,6 +2596,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -2623,12 +2640,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
diff --git a/demo/scripts/index.js b/demo/scripts/index.js
index e7a6689..f05b3a9 100644
--- a/demo/scripts/index.js
+++ b/demo/scripts/index.js
@@ -44,13 +44,10 @@ function computeWitness(){
     console.log("y: " + y);
 
     // Compute the ZkInterface witness with the ZoKrates module.
-    let {prover_msg_tmp, verifier_msg_tmp} = zkif_zokrates.make_witness(code, x, y);
+    prover_msg, verifier_msg = zkif_zokrates.make_witness(code, x, y);
 
-    console.log("output parameter, prover_msg_tmp: " + prover_msg_tmp);
-    console.log("output parameter, verifier_msg_tmp: " + verifier_msg_tmp);
-
-    prover_msg = prover_msg_tmp;
-    verifier_msg = verifier_msg_tmp;
+    console.log("output parameter, prover_msg: " + prover_msg);
+    console.log("output parameter, verifier_msg: " + verifier_msg);
 
     // Display.
     document.getElementById("prover").innerText = `
diff --git a/demo/styles/font-awesome.min.css b/demo/styles/font-awesome.min.css
deleted file mode 100644
index 540440c..0000000
--- a/demo/styles/font-awesome.min.css
+++ /dev/null
@@ -1,4 +0,0 @@
-/*!
- *  Font Awesome 4.7.0 by @davegandy - http://fontawesome.io - @fontawesome
- *  License - http://fontawesome.io/license (Font: SIL OFL 1.1, CSS: MIT License)
- */@font-face{font-family:'FontAwesome';src:url('../fonts/fontawesome-webfont.eot?v=4.7.0');src:url('../fonts/fontawesome-webfont.eot?#iefix&v=4.7.0') format('embedded-opentype'),url('../fonts/fontawesome-webfont.woff2?v=4.7.0') format('woff2'),url('../fonts/fontawesome-webfont.woff?v=4.7.0') format('woff'),url('../fonts/fontawesome-webfont.ttf?v=4.7.0') format('truetype'),url('../fonts/fontawesome-webfont.svg?v=4.7.0#fontawesomeregular') format('svg');font-weight:normal;font-style:normal}.fa{display:inline-block;font:normal normal normal 14px/1 FontAwesome;font-size:inherit;text-rendering:auto;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.fa-lg{font-size:1.33333333em;line-height:.75em;vertical-align:-15%}.fa-2x{font-size:2em}.fa-3x{font-size:3em}.fa-4x{font-size:4em}.fa-5x{font-size:5em}.fa-fw{width:1.28571429em;text-align:center}.fa-ul{padding-left:0;margin-left:2.14285714em;list-style-type:none}.fa-ul>li{position:relative}.fa-li{position:absolute;left:-2.14285714em;width:2.14285714em;top:.14285714em;text-align:center}.fa-li.fa-lg{left:-1.85714286em}.fa-border{padding:.2em .25em .15em;border:solid .08em #eee;border-radius:.1em}.fa-pull-left{float:left}.fa-pull-right{float:right}.fa.fa-pull-left{margin-right:.3em}.fa.fa-pull-right{margin-left:.3em}.pull-right{float:right}.pull-left{float:left}.fa.pull-left{margin-right:.3em}.fa.pull-right{margin-left:.3em}.fa-spin{-webkit-animation:fa-spin 2s infinite linear;animation:fa-spin 2s infinite linear}.fa-pulse{-webkit-animation:fa-spin 1s infinite steps(8);animation:fa-spin 1s infinite steps(8)}@-webkit-keyframes fa-spin{0%{-webkit-transform:rotate(0deg);transform:rotate(0deg)}100%{-webkit-transform:rotate(359deg);transform:rotate(359deg)}}@keyframes fa-spin{0%{-webkit-transform:rotate(0deg);transform:rotate(0deg)}100%{-webkit-transform:rotate(359deg);transform:rotate(359deg)}}.fa-rotate-90{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=1)";-webkit-transform:rotate(90deg);-ms-transform:rotate(90deg);transform:rotate(90deg)}.fa-rotate-180{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=2)";-webkit-transform:rotate(180deg);-ms-transform:rotate(180deg);transform:rotate(180deg)}.fa-rotate-270{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=3)";-webkit-transform:rotate(270deg);-ms-transform:rotate(270deg);transform:rotate(270deg)}.fa-flip-horizontal{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=0, mirror=1)";-webkit-transform:scale(-1, 1);-ms-transform:scale(-1, 1);transform:scale(-1, 1)}.fa-flip-vertical{-ms-filter:"progid:DXImageTransform.Microsoft.BasicImage(rotation=2, mirror=1)";-webkit-transform:scale(1, -1);-ms-transform:scale(1, -1);transform:scale(1, -1)}:root .fa-rotate-90,:root .fa-rotate-180,:root .fa-rotate-270,:root .fa-flip-horizontal,:root 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0, 0, 0);border:0}.sr-only-focusable:active,.sr-only-focusable:focus{position:static;width:auto;height:auto;margin:0;overflow:visible;clip:auto}
diff --git a/demo/webpack.config.js b/demo/webpack.config.js
index ead53ae..cc18d54 100644
--- a/demo/webpack.config.js
+++ b/demo/webpack.config.js
@@ -9,6 +9,6 @@ module.exports = {
   },
   mode: "development",
   plugins: [
-    new CopyWebpackPlugin(['index.html', "node_modules/bootstrap/dist/css/bootstrap.min.css", "styles/index.css", "styles/presented_by_qedit.svg", "styles/font-awesome.min.css"])
+    new CopyWebpackPlugin(['index.html', "node_modules/bootstrap/dist/css/bootstrap.min.css", "styles/index.css", "styles/presented_by_qedit.svg"])
   ],
 };

From 613066edabc08508e08231a8dadbd4ccd8bbf9ec Mon Sep 17 00:00:00 2001
From: ron <ron@qed-it.com>
Date: Sun, 28 Jul 2019 15:35:08 +0300
Subject: [PATCH 3/6] fix: fix minor issues index.js

---
 demo/scripts/index.js | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/demo/scripts/index.js b/demo/scripts/index.js
index f05b3a9..20aa0e1 100644
--- a/demo/scripts/index.js
+++ b/demo/scripts/index.js
@@ -30,7 +30,6 @@ function generateConstraints (){
     document.getElementById("cs").innerText = zkif_zokrates.pretty(constraints).trim();
 
     console.log("generateConstraints finished");
-
 }
 
 document.getElementById("computeWitnessBtn").addEventListener("click", computeWitness); 
@@ -44,7 +43,10 @@ function computeWitness(){
     console.log("y: " + y);
 
     // Compute the ZkInterface witness with the ZoKrates module.
-    prover_msg, verifier_msg = zkif_zokrates.make_witness(code, x, y);
+    let res  = zkif_zokrates.make_witness(code, x, y);
+    
+    prover_msg = res.prover_msg;
+    verifier_msg = res.verifier_msg;
 
     console.log("output parameter, prover_msg: " + prover_msg);
     console.log("output parameter, verifier_msg: " + verifier_msg);
@@ -82,7 +84,7 @@ function createProof(){
 
     document.getElementById("verifier").innerText = `
     Proof created. (${proof.length} bytes)
-    `
+    `;
 
     console.log("createProof finished");
 }
@@ -124,7 +126,7 @@ function verifyProof(){
         let public_inputs = zkif_zokrates.parse_verifier_msg(msg);
         let x = public_inputs[1][0];
         let zz = public_inputs[2][0];
-        return `${x}^2 + y^2 = ${zz}`
+        return `${x}^2 + y^2 = ${zz}`;
     }
 
     let status = `The statement is ${verif && "proven" || "NOT proven"}:  ${statement(verifier_msg)}`;
@@ -134,5 +136,4 @@ function verifyProof(){
     console.log("output parameter proof value: " + proof);
 
     console.log("verifyProof finished");
-
 }

From 9bd9cda559bb56ef0d61473418989c21bdf34910 Mon Sep 17 00:00:00 2001
From: ron <ron@qed-it.com>
Date: Mon, 29 Jul 2019 15:56:07 +0300
Subject: [PATCH 4/6] update verifer display block

---
 demo/scripts/index.js | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/demo/scripts/index.js b/demo/scripts/index.js
index 20aa0e1..96d8489 100644
--- a/demo/scripts/index.js
+++ b/demo/scripts/index.js
@@ -82,9 +82,12 @@ function createProof(){
     proof = zkif_bulletproofs.prove(constraints, prover_msg);
     console.log("output parameter proof value: " + proof);
 
-    document.getElementById("verifier").innerText = `
-    Proof created. (${proof.length} bytes)
-    `;
+    var proofHex =  toHexString(proof);
+    var proofHexSubset = proofHex.substring(0, 20);
+
+    var verifierEle = document.getElementById("verifier");
+    verifierEle.innerText = "Prover:\n";
+    verifierEle.insertAdjacentText("beforeend","Proof created, proof-content=" +  proofHexSubset +"... (" + proof.length + " bytes)\n");
 
     console.log("createProof finished");
 }
@@ -102,21 +105,20 @@ function verifyProof(){
         return;
     }
 
-    if (!proof) {
-        window.alert("proof is empty, please create proof first.");
+    if (!constraints) {
+        window.alert("constraints are empty, please generate constraints first.");
         return;
     }
 
-    if (!constraints) {
-        window.alert("constraints are empty, please generate constraints first.");
+    if (!proof) {
+        window.alert("proof is empty, please create proof first.");
         return;
     }
 
     // Prover sends verifier_msg and proof to the verifier.
-    document.getElementById("verifier").insertAdjacentText("beforeend",`
-    ${zkif_zokrates.pretty(verifier_msg)}
-    Verifying proof (${proof.length} bytes)
-    `.trim());
+    document.getElementById("verifier").insertAdjacentText("beforeend","\nVerify: \
+    " + zkif_zokrates.pretty(verifier_msg) + "\n\
+    Verifying proof (" +proof.length + " bytes)");
 
     // Verify the proof using the Bulletproofs module and the messages.
     let verif = zkif_bulletproofs.verify(constraints, verifier_msg, proof);
@@ -137,3 +139,9 @@ function verifyProof(){
 
     console.log("verifyProof finished");
 }
+
+function toHexString(byteArray) {
+    return Array.from(byteArray, function(byte) {
+      return ('0' + (byte & 0xFF).toString(16)).slice(-2);
+    }).join('')
+  }
\ No newline at end of file

From a45eb5dec49de769cdd45cbb7ec2c0708d60a6b6 Mon Sep 17 00:00:00 2001
From: ron <ron@qed-it.com>
Date: Mon, 29 Jul 2019 16:08:51 +0300
Subject: [PATCH 5/6] feat: change btns color and href

---
 demo/index.html | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/demo/index.html b/demo/index.html
index 0c33a27..810f3fe 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -13,6 +13,10 @@
 <link href="//netdna.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet">
     <style>
 
+      a:link {
+        color: #17a2b8;
+      }
+
       .bd-placeholder-img {
         font-size: 1.125rem;
         text-anchor: middle;
@@ -153,16 +157,12 @@ <h2 class="display-5">Zero-knowledge Program</h2>
     </code></pre>
 
     <div class="btn-group btn-block" role="group" aria-label="Basic example">
-        <button type="button" id="computeWitnessBtn" class="btn btn-secondary btn-warning btn-lg">&nbsp; Compute Witness &nbsp;<i class="fa fa-chevron-down fa-fw" aria-hidden="true"></i>
+        <button type="button" id="computeWitnessBtn" class="btn btn-info btn-lg">&nbsp; Compute Witness &nbsp;<i class="fa fa-chevron-down fa-fw" aria-hidden="true"></i>
         </button>
-        <button type="button" id="generateConstraintsBtn" class="btn btn-secondary btn-warning btn-lg">&nbsp; Generate constraints &nbsp;<i class="fa fa-chevron-right fa-fw" aria-hidden="true"></i>
+        <button type="button" id="generateConstraintsBtn" class="btn btn-info btn-lg">&nbsp; Generate constraints &nbsp;<i class="fa fa-chevron-right fa-fw" aria-hidden="true"></i>
         </button>
       </div>
 
- <!--
-    <button type="button" id="generateConstraintsBtn" class="btn btn-warning btn-lg btn-block">Generate constraints</button>
-  -->
-
 </div>
 
   <div class="border-dark-q arrow-right my-auto"></div>
@@ -204,7 +204,7 @@ <h2 class="display-5">Prover's View</h2>
           id="prover">
           _
         </code></pre>
-        <button type="button" id="createProofBtn" class="btn btn-warning btn-lg btn-block">Generate proof</button>
+        <button type="button" id="createProofBtn" class="btn btn-info btn-lg btn-block">Generate proof</button>
 
   </div>
 
@@ -221,7 +221,7 @@ <h2 class="display-5">Verifier's View</h2>
       </code>
 
 <span id="status"></span></pre>
-<button type="button" id="verifyProofBtn" class="btn btn-warning btn-lg btn-block">Verify proof</button>
+<button type="button" id="verifyProofBtn" class="btn btn-info btn-lg btn-block">Verify proof</button>
   </div>
 
 </div>

From 3a729ad0230e8f5635147c33e2c4eb18eb67e948 Mon Sep 17 00:00:00 2001
From: ron <ron@qed-it.com>
Date: Wed, 31 Jul 2019 17:44:11 +0300
Subject: [PATCH 6/6] add prints

---
 ci/Makefile  | 6 ++++++
 ci/script.sh | 7 +++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/ci/Makefile b/ci/Makefile
index 69370a9..044d456 100644
--- a/ci/Makefile
+++ b/ci/Makefile
@@ -1,14 +1,20 @@
+echo executing makefile
+
 all: install build-wasm build-web
 
 build-wasm:
+	echo building wasm:
 	wasm-pack build --out-dir ../../demo/pkg/zkif-wasm-zokrates/     ../zkif-wasm-bundles/zkif-wasm-zokrates
 	wasm-pack build --out-dir ../../demo/pkg/zkif-wasm-bulletproofs/ ../zkif-wasm-bundles/zkif-wasm-bulletproofs
 
 build-web:
+	echo build-web:
 	cd ../demo && npm run build
 
 install:
+	echo install:
 	cd ../demo && npm install
 
 web-dev:
+	echo web-dev:
 	cd ../demo && npm run start
diff --git a/ci/script.sh b/ci/script.sh
index 7bca7e8..b5adcfb 100755
--- a/ci/script.sh
+++ b/ci/script.sh
@@ -4,16 +4,19 @@ set +x
 
 echo executing scripit.sh
 
+echo processing bulletproof: checks & tests
 cd ./zkif-wasm-bundles/zkif-wasm-bulletproofs/
 cargo +nightly-2019-06-22 fmt -- --check
 cargo +nightly-2019-06-22 clippy -- -D warnings
 cargo +nightly-2019-06-22 test
 
+echo processing zk-interface wasm example: checks & tests
 cd ../zkif-wasm-example
 cargo +nightly-2019-06-22 fmt -- --check
 cargo +nightly-2019-06-22 clippy -- -D warnings
 cargo +nightly-2019-06-22 test
 
+echo processing zokrates: checks & tests
 cd ../zkif-wasm-zokrates
 cargo +nightly-2019-06-22 fmt -- --check
 cargo +nightly-2019-06-22 clippy -- -D warnings
@@ -22,5 +25,5 @@ cargo +nightly-2019-06-22 test
 cd ../../ci
 make
 cd ../demo
-npm install
-npm run build
\ No newline at end of file
+#npm install
+#npm run build