Created
April 17, 2023 00:26
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ZKP example in Golang
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| package main | |
| import ( | |
| "crypto/elliptic" | |
| "crypto/rand" | |
| "fmt" | |
| "math/big" | |
| ) | |
| type Prover struct { | |
| d *big.Int | |
| } | |
| type Verifier struct { | |
| Px, Py, Qx, Qy *big.Int | |
| } | |
| func performZKP(prover *Prover, verifier *Verifier, curve elliptic.Curve, rounds int) bool { | |
| for i := 0; i < rounds; i++ { | |
| r, _ := rand.Int(rand.Reader, curve.Params().N) | |
| Rx, Ry := curve.ScalarMult(verifier.Px, verifier.Py, r.Bytes()) | |
| c, _ := rand.Int(rand.Reader, curve.Params().N) | |
| s := new(big.Int).Mul(prover.d, c) | |
| s.Add(s, r) | |
| s.Mod(s, curve.Params().N) | |
| Sx, Sy := curve.ScalarMult(verifier.Px, verifier.Py, s.Bytes()) | |
| RxcQ, RycQ := curve.ScalarMult(verifier.Qx, verifier.Qy, c.Bytes()) | |
| RxcQxR, RxcQyR := curve.Add(Rx, Ry, RxcQ, RycQ) | |
| if Sx.Cmp(RxcQxR) != 0 || Sy.Cmp(RxcQyR) != 0 { | |
| return false | |
| } | |
| } | |
| return true | |
| } | |
| func main() { | |
| curve := elliptic.P256() | |
| Px, Py := curve.ScalarBaseMult(nil) | |
| d := big.NewInt(42) | |
| Qx, Qy := curve.ScalarMult(Px, Py, d.Bytes()) | |
| prover := &Prover{d: d} | |
| verifier := &Verifier{Px: Px, Py: Py, Qx: Qx, Qy: Qy} | |
| success := performZKP(prover, verifier, curve, 10) | |
| fmt.Printf("Zero-Knowledge Proof: %v\n", success) | |
| } |
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