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tpke_test.go
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tpke_test.go
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package tpke
import (
"testing"
bls "github.com/kilic/bls12-381"
)
func TestTPKE(t *testing.T) {
size := 7
threshold := 5
dkg := NewDKG(size, threshold)
dkg.Prepare()
if err := dkg.VerifyPrepare(); err != nil {
t.Fatalf(err.Error())
}
pubkey := dkg.PublishGlobalPublicKey()
prvkeys := dkg.GetPrivateKeysFromPrepare()
// Encrypt
msg := make([]*bls.PointG1, 1)
msg[0] = RandPG1()
cipherTexts := Encrypt(msg, pubkey)
// Verify ciphertext
if err := cipherTexts[0].Verify(); err != nil {
t.Fatalf("invalid ciphertext.")
}
// Generate shares
shares := decryptShare(cipherTexts, prvkeys)
// Put a wrong share
shares[2][0].pg1 = RandPG1()
// Decrypt
results, err := Decrypt(cipherTexts, shares, pubkey, threshold, dkg.GetScaler())
if err != nil {
t.Fatalf(err.Error())
}
if !bls.NewG1().Equal(msg[0], results[0]) {
t.Fatalf("decryption failed.")
}
}
func TestReshareTPKEOld(t *testing.T) {
size := 7
threshold := 5
dkg := NewDKG(size, threshold)
dkg.Prepare()
if err := dkg.VerifyPrepare(); err != nil {
t.Fatalf(err.Error())
}
pubkey := dkg.PublishGlobalPublicKey()
dkg.Reshare()
if err := dkg.VerifyReshare(); err != nil {
t.Fatalf(err.Error())
}
prvkeys := dkg.GetPrivateKeysFromPrepare()
// Encrypt with old key
msg := make([]*bls.PointG1, 1)
msg[0] = RandPG1()
cipherTexts := Encrypt(msg, pubkey)
cipherTexts[0].fromLastRound = true
// Verify ciphertext
if err := cipherTexts[0].Verify(); err != nil {
t.Fatalf("invalid ciphertext.")
}
// Generate shares
shares := decryptShare(cipherTexts, prvkeys)
// Put a wrong share
shares[2][0].pg1 = RandPG1()
// Decrypt
results, err := Decrypt(cipherTexts, shares, pubkey, threshold, dkg.GetScaler())
if err != nil {
t.Fatalf(err.Error())
}
if !bls.NewG1().Equal(msg[0], results[0]) {
t.Fatalf("decryption failed.")
}
}
func TestReshareTPKENew(t *testing.T) {
size := 7
threshold := 5
dkg := NewDKG(size, threshold)
dkg.Prepare()
if err := dkg.VerifyPrepare(); err != nil {
t.Fatalf(err.Error())
}
dkg.Reshare()
if err := dkg.VerifyReshare(); err != nil {
t.Fatalf(err.Error())
}
dkg.Prepare()
if err := dkg.VerifyPrepare(); err != nil {
t.Fatalf(err.Error())
}
pubkey := dkg.PublishGlobalPublicKey()
prvkeys := dkg.GetPrivateKeysFromPrepare()
// Encrypt with new key
msg := make([]*bls.PointG1, 1)
msg[0] = RandPG1()
cipherTexts := Encrypt(msg, pubkey)
cipherTexts[0].fromLastRound = false
// Verify ciphertext
if err := cipherTexts[0].Verify(); err != nil {
t.Fatalf("invalid ciphertext.")
}
// Generate shares
shares := decryptShare(cipherTexts, prvkeys)
// Put a wrong share
shares[2][0].pg1 = RandPG1()
// Decrypt
results, err := Decrypt(cipherTexts, shares, pubkey, threshold, dkg.GetScaler())
if err != nil {
t.Fatalf(err.Error())
}
if !bls.NewG1().Equal(msg[0], results[0]) {
t.Fatalf("decryption failed.")
}
}
func TestBytesEncoding(t *testing.T) {
ct := &CipherText{
cMsg: &bls.G1One,
bigR: &bls.G1One,
commitment: &bls.G2One,
}
b := ct.ToBytes()
result, err := BytesToCipherText(b)
if err != nil {
t.Fatalf(err.Error())
}
if !bls.NewG1().Equal(ct.cMsg, result.cMsg) {
t.Fatalf("cMsg mismatch.")
}
if !bls.NewG1().Equal(ct.bigR, result.bigR) {
t.Fatalf("bigR mismatch.")
}
if !bls.NewG2().Equal(ct.commitment, result.commitment) {
t.Fatalf("commitment mismatch.")
}
}