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package ristretto_test
import (
"bytes"
"fmt"
"github.com/bwesterb/go-ristretto"
)
func Example() {
// Generate an El'Gamal keypair
var secretKey ristretto.Scalar
var publicKey ristretto.Point
secretKey.Rand() // generate a new secret key
publicKey.ScalarMultBase(&secretKey) // compute public key
// El'Gamal encrypt a random curve point p into a ciphertext-pair (c1,c2)
var p ristretto.Point
var r ristretto.Scalar
var c1 ristretto.Point
var c2 ristretto.Point
p.Rand()
r.Rand()
c2.ScalarMultBase(&r)
c1.PublicScalarMult(&publicKey, &r)
c1.Add(&c1, &p)
// Decrypt (c1,c2) back to p
var blinding, p2 ristretto.Point
blinding.ScalarMult(&c2, &secretKey)
p2.Sub(&c1, &blinding)
fmt.Printf("%v", bytes.Equal(p.Bytes(), p2.Bytes()))
// Output:
// true
}
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