10 changed files with 159 additions and 1 deletions
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+1 -0.github/workflows/lint.yml
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+1 -1.github/workflows/test.yml
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+1 -0.gitignore
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+3 -0README.md
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+15 -0wasm/README.md
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+100 -0wasm/blindsecp256k1-wasm.go
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+4 -0wasm/build.sh
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BINwasm/webtest/blindsecp256k1.wasm
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+18 -0wasm/webtest/index.html
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+16 -0wasm/webtest/index.js
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wasm_exec.js |
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# blindsecp256k1 wasm clientlib |
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[blindsecp256k1](https://github.com/arnaucube/go-blindsecp256k1) lib for browsers using go WASM. |
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## Wasm usage |
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To compile to wasm, inside the `wasm` directory, execute: |
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``` |
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./build.sh |
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``` |
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Add the file `wasm_exec.js` in the `webtest` directory: |
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``` |
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cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" . |
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``` |
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To see the usage from javascript, check `index.js` file. |
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package main |
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import ( |
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"blindsecp256k1" |
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"fmt" |
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"math/big" |
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"syscall/js" |
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) |
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func main() { |
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c := make(chan struct{}, 0) |
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println("WASM blindsecp256k1 initialized") |
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registerCallbacks() |
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<-c |
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} |
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func registerCallbacks() { |
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js.Global().Set("blind", js.FuncOf(blind)) |
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js.Global().Set("unblind", js.FuncOf(unblind)) |
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} |
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func stringToBigInt(s string) *big.Int { |
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b, ok := new(big.Int).SetString(s, 10) |
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if !ok { |
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panic(fmt.Errorf("error parsing string *big.Int: %s", s)) |
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} |
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return b |
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} |
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func blind(this js.Value, values []js.Value) interface{} { |
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mStr := values[0].String() |
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signerQxStr := values[1].String() |
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signerQyStr := values[2].String() |
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signerRxStr := values[3].String() |
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signerRyStr := values[4].String() |
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m := stringToBigInt(mStr) |
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signerQx := stringToBigInt(signerQxStr) |
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signerQy := stringToBigInt(signerQyStr) |
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signerRx := stringToBigInt(signerRxStr) |
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signerRy := stringToBigInt(signerRyStr) |
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signerQ := &blindsecp256k1.PublicKey{ |
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X: signerQx, |
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Y: signerQy, |
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} |
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signerR := &blindsecp256k1.Point{ |
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X: signerRx, |
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Y: signerRy, |
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} |
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signer := &blindsecp256k1.SignerPublicData{signerQ, signerR} |
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mBlinded, user := blindsecp256k1.Blind(m, signer) |
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r := make(map[string]interface{}) |
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r["mBlinded"] = mBlinded.String() |
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r["uA"] = user.A.String() |
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r["uB"] = user.B.String() |
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r["uC"] = user.C.String() |
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r["uC"] = user.C.String() |
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r["uFx"] = user.F.X.String() |
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r["uFy"] = user.F.Y.String() |
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return r |
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} |
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func unblind(this js.Value, values []js.Value) interface{} { |
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sBlindStr := values[0].String() |
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mStr := values[1].String() |
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uBStr := values[2].String() |
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uCStr := values[3].String() |
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uFxStr := values[4].String() |
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uFyStr := values[5].String() |
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sBlind := stringToBigInt(sBlindStr) |
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m := stringToBigInt(mStr) |
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uB := stringToBigInt(uBStr) |
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uC := stringToBigInt(uCStr) |
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uFx := stringToBigInt(uFxStr) |
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uFy := stringToBigInt(uFyStr) |
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uF := &blindsecp256k1.Point{ |
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X: uFx, |
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Y: uFy, |
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} |
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u := &blindsecp256k1.UserSecretData{ |
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// A not needed to Unblind
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B: uB, |
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C: uC, |
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F: uF, |
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} |
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sig := blindsecp256k1.Unblind(sBlind, m, u) |
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r := make(map[string]interface{}) |
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r["s"] = sig.S.String() |
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r["fx"] = sig.F.X.String() |
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r["fy"] = sig.F.Y.String() |
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return r |
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} |
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#!/bin/sh |
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GOARCH=wasm GOOS=js go build -o blindsecp256k1.wasm blindsecp256k1-wasm.go |
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mv blindsecp256k1.wasm webtest/blindsecp256k1.wasm |
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BIN
wasm/webtest/blindsecp256k1.wasm
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wasm/webtest/blindsecp256k1.wasm
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<html> |
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<head> |
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<meta charset="utf-8"> |
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<title>blindsecp256k1 WASM wrappers</title> |
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</head> |
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<body> |
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<script src="wasm_exec.js"></script> |
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<script> |
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const go = new Go(); |
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WebAssembly.instantiateStreaming(fetch('blindsecp256k1.wasm'), go.importObject).then(function(dat) { |
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go.run(dat.instance); |
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}); |
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</script> |
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<h3>Open the browser console to see the logs</h3> |
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<button onClick="test();">test()</button> |
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<script src="index.js"></script> |
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</body> |
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</html> |
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function test() { |
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let m = "1952805748"; |
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// Q & R would be received from the Signer
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let signerQx = "26613296432153871833441195158297038913673464785502568519907582377915678491093"; |
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let signerQy = "81940194042971427014176158889809922552127995083760111384335138546589994227275"; |
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let signerRx = "59371873487402651110657306418818354906476102545298559461791300717696053835454"; |
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let signerRy = "98322875246066710654579302898391677189379767946198239290895789444110962324342"; |
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let blindRes = blind(m, signerQx, signerQy, signerRx, signerRy); |
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console.log("blind", blindRes); |
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// sBlind would be received from the Signer
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let sBlind = "7240298625621589352655632414257224668430424461224914067754717095121139699933353374227084479180038954015287518505167995306229258561275087198611946596619855"; |
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let unblindRes = unblind(sBlind, m, blindRes.uB, blindRes.uC, blindRes.uFx, blindRes.uFy); |
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console.log("unblind", unblindRes); |
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} |
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