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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# blindsig-client-server-example
Example of usage of https://github.com/arnaucube/go-blindsecp256k1, including a server representing the 'signer', and a web representing the 'user'.
## Run
- Needs [go](https://golang.org/) installed
- Add the file `wasm_exec.js` in the `client` directory:
```
cd client
cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" .
```
- Run the server:
```
go run main.go
```
- Open the browser at `127.0.0.1:3000/web`
## Flow
![diagram](https://raw.githubusercontent.com/arnaucube/blindsig-client-server-example/master/diagram.png "diagram")

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<html>
<head>
<meta charset="utf-8">
<title>blindsig-client-server-example</title>
</head>
<body>
<script src="wasm_exec.js"></script>
<script>
const go = new Go();
WebAssembly.instantiateStreaming(fetch('blindsecp256k1.wasm'), go.importObject).then(function(dat) {
go.run(dat.instance);
});
</script>
<h3>blindsig-client-server-example</h3>
<p>This is an example of usage of <a href="https://github.com/arnaucube/go-blindsecp256k1" target="_blank">https://github.com/arnaucube/go-blindsecp256k1</a></p>
<br>
Message (only numbers): <input id="msg" value="1234"></input>
<button onClick="newRequest();">newRequest()</button>
<p id="signerRx"></p>
<p id="signerRy"></p>
<p id="signerQx"></p>
<p id="signerQy"></p>
<button onClick="askBlindSign();">askBlindSign()</button>
<p id="sBlind"></p>
<p id="sigS"></p>
<p id="sigFx"></p>
<p id="sigFy"></p>
<button onClick="verify();">verify()</button>
<p id="verified"></p>
<script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
<script src="index.js"></script>
</body>
</html>

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// signer public parameters
let rx, ry, qx, qy;
// user parameters
let m, mBlinded, uA, uB, uFx, uFy, sigS, sigFx, sigFy;
function newRequest() {
m = document.getElementById("msg").value;
axios.get('/request')
.then(function (res) {
console.log("/request res:", res.data);
rx = res.data.signerR.x;
ry = res.data.signerR.y;
qx = res.data.signerQ.x;
qy = res.data.signerQ.y;
document.getElementById("signerRx").innerHTML = "signerR.x: " + rx;
document.getElementById("signerRy").innerHTML = "signerR.y: " + ry;
document.getElementById("signerQx").innerHTML = "signerQ.x: " + qx;
document.getElementById("signerQy").innerHTML = "signerQ.y: " + qy;
console.log("blind msg");
let blindRes = wasmBlind(m, rx, ry);
console.log("blindRes:", blindRes);
mBlinded = blindRes.mBlinded;
uA = blindRes.uA;
uB = blindRes.uB;
uFx = blindRes.uFx;
uFy = blindRes.uFy;
})
.catch(function (error) {
console.error(error);
alert(error);
});
}
function askBlindSign() {
console.log("askBlindSign");
let data = {
m: mBlinded,
r: {x:rx, y:ry}
};
axios.post('/blindsign', data)
.then(function (res) {
console.log("/blindSign res:", res.data);
document.getElementById("sBlind").innerHTML = "sBlind: " + res.data.sBlind;
let unblindRes = wasmUnblind(res.data.sBlind, m, uA, uB, uFx, uFy);
console.log("unblind", unblindRes);
sigS = unblindRes.s;
sigFx = unblindRes.fx;
sigFy = unblindRes.fy;
document.getElementById("sigS").innerHTML = "s: " + sigS;
document.getElementById("sigFx").innerHTML = "f.x: " + sigFx;
document.getElementById("sigFy").innerHTML = "f.y: " + sigFy;
})
.catch(function (error) {
console.error(error);
alert(error);
});
}
function verify() {
let verified = wasmVerify(m, sigS, sigFx, sigFy, qx, qy);
console.log("verify", verified);
document.getElementById("verified").innerHTML = "signature verification, verified: " + verified;
}

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module example
go 1.14
require (
github.com/arnaucube/go-blindsecp256k1 v0.0.0-20210117185306-6b939806742d
github.com/gin-gonic/gin v1.6.3 // indirect
github.com/stretchr/testify v1.6.1
)

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@@ -0,0 +1,232 @@
github.com/Azure/azure-pipeline-go v0.2.1/go.mod h1:UGSo8XybXnIGZ3epmeBw7Jdz+HiUVpqIlpz/HKHylF4=
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gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
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gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce/go.mod h1:5AcXVHNjg+BDxry382+8OKon8SEWiKktQR07RKPsv1c=
gopkg.in/olebedev/go-duktape.v3 v3.0.0-20200619000410-60c24ae608a6/go.mod h1:uAJfkITjFhyEEuUfm7bsmCZRbW5WRq8s9EY8HZ6hCns=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
gopkg.in/urfave/cli.v1 v1.20.0/go.mod h1:vuBzUtMdQeixQj8LVd+/98pzhxNGQoyuPBlsXHOQNO0=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=

57
main.go Normal file
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package main
import (
"math/big"
"net/http"
blindsecp256k1 "github.com/arnaucube/go-blindsecp256k1"
"github.com/gin-gonic/gin"
)
var sk *blindsecp256k1.PrivateKey
var secretRs = make(map[string]*big.Int)
func getNewRequest(c *gin.Context) {
k, signerR := blindsecp256k1.NewRequestParameters()
key := signerR.X.String() + signerR.Y.String()
secretRs[key] = k
c.JSON(http.StatusOK, gin.H{"signerR": signerR, "signerQ": sk.Public().Point()})
}
type msgPostBlindSign struct {
M string `json:"m"`
R *blindsecp256k1.Point `json:"r"`
}
func postBlindSign(c *gin.Context) {
var msg msgPostBlindSign
c.BindJSON(&msg)
m, ok := new(big.Int).SetString(msg.M, 10)
if !ok {
c.String(http.StatusBadRequest, "can not parse m")
return
}
key := msg.R.X.String() + msg.R.Y.String()
if _, ok := secretRs[key]; !ok {
c.String(http.StatusBadRequest, "unknown R")
return
}
k := secretRs[key]
sBlind := sk.BlindSign(m, k)
c.JSON(http.StatusOK, gin.H{"sBlind": sBlind.String()})
}
func main() {
secretRs = make(map[string]*big.Int)
sk = blindsecp256k1.NewPrivateKey()
r := gin.Default()
r.GET("/request", getNewRequest)
r.POST("/blindsign", postBlindSign)
r.Static("/web", "./client")
r.Run(":3000")
}