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package main
import (
"fmt"
"math/big"
"syscall/js"
"github.com/arnaucube/go-blindsecp256k1"
blindsecp256k1v0 "github.com/arnaucube/go-blindsecp256k1/v0"
)
func main() {
c := make(chan struct{}, 0)
println("WASM blindsecp256k1 initialized")
registerCallbacks()
<-c
}
func registerCallbacks() {
js.Global().Set("wasmReady", js.FuncOf(ready))
// blindv0 & unblindv0 uses:
// http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pdf
js.Global().Set("wasmBlindv0", js.FuncOf(blindv0))
js.Global().Set("wasmUnblindv0", js.FuncOf(unblindv0))
js.Global().Set("wasmVerifyv0", js.FuncOf(verifyv0))
// blind & unblind uses: https://sci-hub.do/10.1109/ICCKE.2013.6682844
js.Global().Set("wasmBlind", js.FuncOf(blind))
js.Global().Set("wasmUnblind", js.FuncOf(unblind))
js.Global().Set("wasmVerify", js.FuncOf(verify))
}
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 ready(this js.Value, values []js.Value) interface{} {
return "ready"
}
func blindv0(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,
}
mBlinded, user := blindsecp256k1v0.Blind(m, signerQ, signerR)
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 unblindv0(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 := &blindsecp256k1v0.UserSecretData{
// A not needed to Unblind
B: uB,
C: uC,
F: uF,
}
sig := blindsecp256k1v0.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
}
func verifyv0(this js.Value, values []js.Value) interface{} {
mStr := values[0].String()
sigSStr := values[1].String()
sigFxStr := values[2].String()
sigFyStr := values[3].String()
qxStr := values[4].String()
qyStr := values[5].String()
m := stringToBigInt(mStr)
sigS := stringToBigInt(sigSStr)
sigFx := stringToBigInt(sigFxStr)
sigFy := stringToBigInt(sigFyStr)
qx := stringToBigInt(qxStr)
qy := stringToBigInt(qyStr)
q := &blindsecp256k1.PublicKey{
X: qx,
Y: qy,
}
sig := &blindsecp256k1.Signature{
S: sigS,
F: &blindsecp256k1.Point{
X: sigFx,
Y: sigFy,
},
}
verified := blindsecp256k1.Verify(m, sig, q)
r := verified
return r
}
func blind(this js.Value, values []js.Value) interface{} {
mStr := values[0].String()
signerRxStr := values[1].String()
signerRyStr := values[2].String()
m := stringToBigInt(mStr)
signerRx := stringToBigInt(signerRxStr)
signerRy := stringToBigInt(signerRyStr)
signerR := &blindsecp256k1.Point{
X: signerRx,
Y: signerRy,
}
mBlinded, user := blindsecp256k1.Blind(m, signerR)
r := make(map[string]interface{})
r["mBlinded"] = mBlinded.String()
r["uA"] = user.A.String()
r["uB"] = user.B.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()
uAStr := values[2].String()
uBStr := values[3].String()
uFxStr := values[4].String()
uFyStr := values[5].String()
sBlind := stringToBigInt(sBlindStr)
m := stringToBigInt(mStr)
uA := stringToBigInt(uAStr)
uB := stringToBigInt(uBStr)
uFx := stringToBigInt(uFxStr)
uFy := stringToBigInt(uFyStr)
uF := &blindsecp256k1.Point{
X: uFx,
Y: uFy,
}
u := &blindsecp256k1.UserSecretData{
A: uA,
B: uB,
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
}
func verify(this js.Value, values []js.Value) interface{} {
mStr := values[0].String()
sigSStr := values[1].String()
sigFxStr := values[2].String()
sigFyStr := values[3].String()
qxStr := values[4].String()
qyStr := values[5].String()
m := stringToBigInt(mStr)
sigS := stringToBigInt(sigSStr)
sigFx := stringToBigInt(sigFxStr)
sigFy := stringToBigInt(sigFyStr)
qx := stringToBigInt(qxStr)
qy := stringToBigInt(qyStr)
q := &blindsecp256k1.PublicKey{
X: qx,
Y: qy,
}
sig := &blindsecp256k1.Signature{
S: sigS,
F: &blindsecp256k1.Point{
X: sigFx,
Y: sigFy,
},
}
verified := blindsecp256k1.Verify(m, sig, q)
r := verified
return r
}