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publicKey.go
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publicKey.go
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package main
import (
// "fmt"
// "strconv"
// "strings"
"github.com/dedis/kyber"
"github.com/dedis/kyber/pairing/bn256"
"github.com/dedis/kyber/util/random"
// "encoding/binary"
// "bytes"
)
// Update - data object representing a single update
type PublicKey struct {
PKG1 []kyber.Point
PKG2 []kyber.Point
}
// generates a public key based on a random seed for commitments of the updates
func (pkey *PublicKey) GenerateKey(numberOfDimensions int) {
suite := bn256.NewSuite()
// seed := random.New()
pkey.PKG1 = make([]kyber.Point , numberOfDimensions)
pkey.PKG2 = make([]kyber.Point , numberOfDimensions)
// generate secret key
privateKey := suite.G1().Scalar().SetInt64(int64(2))
// fmt.Println("Private Key:" + privateKey.String()+ "\n")
// getting the generator for each group
generatorG1 := suite.G1().Point().Mul(suite.G1().Scalar().One(),nil)
generatorG2 := suite.G2().Point().Mul(suite.G2().Scalar().One(),nil)
// fmt.Println("Generator Group G1:" + generatorG1.String()+ "\n")
// fmt.Println("Generator Group G2:" + generatorG2.String()+ "\n")
previousKeyPartG1 := generatorG1
previousKeyPartG2 := generatorG2
for i := 0; i < (numberOfDimensions); i++ {
pkey.PKG1[i] = previousKeyPartG1
pkey.PKG2[i] = previousKeyPartG2
previousKeyPartG1 = suite.G1().Point().Mul(privateKey,previousKeyPartG1)
previousKeyPartG2 = suite.G2().Point().Mul(privateKey,previousKeyPartG2)
}
}
func (pkey *PublicKey) GetGeneratorG1() kyber.Point{
return pkey.PKG1[0]
}
func (pkey *PublicKey) GetGeneratorG2() kyber.Point{
return pkey.PKG2[0]
}
func (pkey *PublicKey) GetFirstPKG2() kyber.Point{
return pkey.PKG2[1]
}
func (pkey *PublicKey) GenerateClientKey() kyber.Scalar {
suite := bn256.NewSuite()
seed := random.New()
pkey.PKG1 = make([]kyber.Point , 1)
pkey.PKG2 = make([]kyber.Point , 1)
privateKey := suite.G1().Scalar().Pick(seed)
generatorG1 := suite.G1().Point().Mul(suite.G1().Scalar().One(),nil)
generatorG2 := suite.G2().Point().Mul(suite.G2().Scalar().One(),nil)
pkey.PKG1[0] = suite.G1().Point().Mul(privateKey,generatorG1)
pkey.PKG2[0] = suite.G2().Point().Mul(privateKey,generatorG2)
return privateKey
}
func (pkey *PublicKey) SetG1Key(key kyber.Point) {
pkey.PKG1 = make([]kyber.Point , 1)
pkey.PKG1[0] = key
}