Add WASM wrappers & compiled

3 years ago · c3e4afc552
10 changed files with 159 additions and 1 deletions
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@ -13,4 +13,5 @@ jobs:
      - name: Lint
        run: |
          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.30.0
          rm -r wasm
          $(go env GOPATH)/bin/golangci-lint run --timeout=5m -c .golangci.yml
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@ -16,4 +16,4 @@ jobs:
    - name: Checkout code
      uses: actions/checkout@v2
    - name: Run tests
      run: go test ./...
      run: go test $(go list ./... | grep -v /wasm)
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1 @@
 wasm_exec.js
--- a/README.md
+++ b/README.md
@ -27,3 +27,6 @@ sig := blindsecp256k1.Unblind(sBlind, msg, user)
 verified := blindsecp256k1.Verify(msg, sig, signerPublicData.Q)
 assert.True(t, verified)
 ```

 ## WASM usage
 WASM wrappers for browser usage can be found at the [wasm](https://github.com/arnaucube/go-blindsecp256k1/tree/master/wasm/) directory with an example in html&js.
--- a/wasm/README.md
+++ b/wasm/README.md
@ -0,0 +1,15 @@
 # blindsecp256k1 wasm clientlib
 [blindsecp256k1](https://github.com/arnaucube/go-blindsecp256k1) lib for browsers using go WASM.

 ## Wasm usage
 To compile to wasm, inside the `wasm` directory, execute:
 ```
 ./build.sh
 ```

 Add the file `wasm_exec.js` in the `webtest` directory:
 ```
 cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" .
 ```

 To see the usage from javascript, check `index.js` file.
--- a/wasm/blindsecp256k1-wasm.go
+++ b/wasm/blindsecp256k1-wasm.go
@ -0,0 +1,100 @@
 package main

 import (
 	"blindsecp256k1"
 	"fmt"
 	"math/big"
 	"syscall/js"
 )

 func main() {
 	c := make(chan struct{}, 0)
 	println("WASM blindsecp256k1 initialized")
 	registerCallbacks()
 	<-c
 }

 func registerCallbacks() {
 	js.Global().Set("blind", js.FuncOf(blind))
 	js.Global().Set("unblind", js.FuncOf(unblind))
 }

 func stringToBigInt(s string) *big.Int {
 	b, ok := new(big.Int).SetString(s, 10)
 	if !ok {
 		panic(fmt.Errorf("error parsing string *big.Int: %s", s))
 	}
 	return b
 }

 func blind(this js.Value, values []js.Value) interface{} {
 	mStr := values[0].String()
 	signerQxStr := values[1].String()
 	signerQyStr := values[2].String()
 	signerRxStr := values[3].String()
 	signerRyStr := values[4].String()

 	m := stringToBigInt(mStr)
 	signerQx := stringToBigInt(signerQxStr)
 	signerQy := stringToBigInt(signerQyStr)
 	signerRx := stringToBigInt(signerRxStr)
 	signerRy := stringToBigInt(signerRyStr)

 	signerQ := &blindsecp256k1.PublicKey{
 		X: signerQx,
 		Y: signerQy,
 	}
 	signerR := &blindsecp256k1.Point{
 		X: signerRx,
 		Y: signerRy,
 	}

 	signer := &blindsecp256k1.SignerPublicData{signerQ, signerR}
 	mBlinded, user := blindsecp256k1.Blind(m, signer)

 	r := make(map[string]interface{})
 	r["mBlinded"] = mBlinded.String()
 	r["uA"] = user.A.String()
 	r["uB"] = user.B.String()
 	r["uC"] = user.C.String()
 	r["uC"] = user.C.String()
 	r["uFx"] = user.F.X.String()
 	r["uFy"] = user.F.Y.String()
 	return r
 }

 func unblind(this js.Value, values []js.Value) interface{} {
 	sBlindStr := values[0].String()
 	mStr := values[1].String()
 	uBStr := values[2].String()
 	uCStr := values[3].String()
 	uFxStr := values[4].String()
 	uFyStr := values[5].String()

 	sBlind := stringToBigInt(sBlindStr)
 	m := stringToBigInt(mStr)
 	uB := stringToBigInt(uBStr)
 	uC := stringToBigInt(uCStr)
 	uFx := stringToBigInt(uFxStr)
 	uFy := stringToBigInt(uFyStr)

 	uF := &blindsecp256k1.Point{
 		X: uFx,
 		Y: uFy,
 	}

 	u := &blindsecp256k1.UserSecretData{
 		// A not needed to Unblind
 		B: uB,
 		C: uC,
 		F: uF,
 	}

 	sig := blindsecp256k1.Unblind(sBlind, m, u)

 	r := make(map[string]interface{})
 	r["s"] = sig.S.String()
 	r["fx"] = sig.F.X.String()
 	r["fy"] = sig.F.Y.String()
 	return r
 }
--- a/wasm/build.sh
+++ b/wasm/build.sh
@ -0,0 +1,4 @@
 #!/bin/sh

 GOARCH=wasm GOOS=js go build -o blindsecp256k1.wasm blindsecp256k1-wasm.go
 mv blindsecp256k1.wasm webtest/blindsecp256k1.wasm
--- a/wasm/webtest/blindsecp256k1.wasm
+++ b/wasm/webtest/blindsecp256k1.wasm
--- a/wasm/webtest/index.html
+++ b/wasm/webtest/index.html
@ -0,0 +1,18 @@
 <html>
 <head>
 	<meta charset="utf-8">
 	<title>blindsecp256k1 WASM wrappers</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>Open the browser console to see the logs</h3>
 	<button onClick="test();">test()</button>
 	<script src="index.js"></script>
 </body>
 </html>
--- a/wasm/webtest/index.js
+++ b/wasm/webtest/index.js
@ -0,0 +1,16 @@
 function test() {
 	let m = "1952805748";

 	// Q & R would be received from the Signer
 	let signerQx = "26613296432153871833441195158297038913673464785502568519907582377915678491093";
 	let signerQy = "81940194042971427014176158889809922552127995083760111384335138546589994227275";
 	let signerRx = "59371873487402651110657306418818354906476102545298559461791300717696053835454";
 	let signerRy = "98322875246066710654579302898391677189379767946198239290895789444110962324342";
 	let blindRes = blind(m, signerQx, signerQy, signerRx, signerRy);
 	console.log("blind", blindRes);

 	// sBlind would be received from the Signer
 	let sBlind = "7240298625621589352655632414257224668430424461224914067754717095121139699933353374227084479180038954015287518505167995306229258561275087198611946596619855";
 	let unblindRes = unblind(sBlind, m, blindRes.uB, blindRes.uC, blindRes.uFx, blindRes.uFy);
 	console.log("unblind", unblindRes);
 }