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blindsig-client-server-example
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Add example Server & Client

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arnaucube 3 years ago
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under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
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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client/blindsecp256k1.wasm
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client/index.html
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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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client/index.js
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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;
}

BIN
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go.mod
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@ -0,0 +1,9 @@
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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go.sum
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@ -0,0 +1,232 @@
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github.com/Azure/azure-pipeline-go v0.2.2/go.mod h1:4rQ/NZncSvGqNkkOsNpOU1tgoNuIlp9AfUH5G1tvCHc=
github.com/Azure/azure-storage-blob-go v0.7.0/go.mod h1:f9YQKtsG1nMisotuTPpO0tjNuEjKRYAcJU8/ydDI++4=
github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
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github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
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github.com/VictoriaMetrics/fastcache v1.5.7/go.mod h1:ptDBkNMQI4RtmVo8VS/XwRY6RoTu1dAWCbrk+6WsEM8=
github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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github.com/btcsuite/btcd v0.0.0-20171128150713-2e60448ffcc6/go.mod h1:Dmm/EzmjnCiweXmzRIAiUWCInVmPgjkzgv5k4tVyXiQ=
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google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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
- 0
main.go
View File

@ -0,0 +1,57 @@
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")
}

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