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zkp speedup

mixer
tzlil.gon 2016-01-20 12:14:15 +02:00
parent 9bb2f47b50
commit ae2b7c51f0
21 changed files with 1056 additions and 249 deletions
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4
meerkat-common/src/main/java/meerkat/crypto/mixnet/Mixer.java
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@ -11,6 +11,6 @@ import java.util.List;
* Created by talm on 25/10/15.
*/
public interface Mixer {
public Pair<Mixing.ZeroKnowledgeProof[][],Crypto.RerandomizableEncryptedMessage[][]>
mix(List<Crypto.RerandomizableEncryptedMessage> ciphertexts) throws InvalidProtocolBufferException;
public MixerOutput mix(List<Crypto.RerandomizableEncryptedMessage> ciphertexts)
throws InvalidProtocolBufferException;
}

13
meerkat-common/src/main/java/meerkat/crypto/mixnet/MixerOutput.java Normal file
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@ -0,0 +1,13 @@
package meerkat.crypto.mixnet;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Mixing;
/**
* Created by Tzlil on 1/18/2016.
*/
public interface MixerOutput {
public Mixing.ZeroKnowledgeProof[][] gerProofs();
public Crypto.RerandomizableEncryptedMessage[][] getEncryptedMessages();
public int getN();
}

12
mixer/src/main/java/main/BatchConverter.java
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@ -1,6 +1,7 @@
package main;
import com.google.protobuf.ByteString;
import meerkat.crypto.mixnet.MixerOutput;
import meerkat.protobuf.BulletinBoardAPI;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Mixing;
@ -29,8 +30,7 @@ public class BatchConverter {
return Integer.valueOf(bs.toString());
}
public List<BulletinBoardAPI.BatchData> mixerOutput2BatchData
(Pair<Mixing.ZeroKnowledgeProof[][], Crypto.RerandomizableEncryptedMessage[][]> mixerOutput) {
public List<BulletinBoardAPI.BatchData> mixerOutput2BatchData(MixerOutput mixerOutput) {
List<BulletinBoardAPI.BatchData> result = new ArrayList<BulletinBoardAPI.BatchData>();
@ -38,14 +38,14 @@ public class BatchConverter {
.setData(IntegerToByteString(n))
.build());
for (Mixing.ZeroKnowledgeProof[] zkpLayer : mixerOutput.a) {
for (Mixing.ZeroKnowledgeProof[] zkpLayer : mixerOutput.gerProofs()) {
for (Mixing.ZeroKnowledgeProof zkp : zkpLayer) {
result.add(BulletinBoardAPI.BatchData.newBuilder()
.setData(zkp.toByteString())
.build());
}
}
for (Crypto.RerandomizableEncryptedMessage[] encryptionLayer : mixerOutput.b) {
for (Crypto.RerandomizableEncryptedMessage[] encryptionLayer : mixerOutput.getEncryptedMessages()) {
for (Crypto.RerandomizableEncryptedMessage encryption : encryptionLayer) {
result.add(BulletinBoardAPI.BatchData.newBuilder()
.setData(encryption.toByteString())
@ -55,7 +55,7 @@ public class BatchConverter {
return result;
}
public Pair<Mixing.ZeroKnowledgeProof[][], Crypto.RerandomizableEncryptedMessage[][]> batchDataList2MixerOutput
public MixerOutput batchDataList2MixerOutput
(List<BulletinBoardAPI.BatchData> batchDataList) throws Exception {
if (n != ByteString2Integer(batchDataList.remove(0).getData())){
@ -83,7 +83,7 @@ public class BatchConverter {
}
}
return new Pair<Mixing.ZeroKnowledgeProof[][], Crypto.RerandomizableEncryptedMessage[][]>(proofs,encryptions);
return new mixer.MixerOutput(n,layers,proofs,encryptions);
}

5
mixer/src/main/java/main/BatchHandler.java
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@ -1,6 +1,7 @@
package main;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeVerifier;
import meerkat.crypto.mixnet.MixerOutput;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Mixing;
import necessary.AsyncBulletinBoardClient;
@ -17,7 +18,7 @@ import java.util.List;
*/
public class BatchHandler implements AsyncBulletinBoardClient.ClientCallback<CompleteBatch> {
private Pair<Mixing.ZeroKnowledgeProof[][], Crypto.RerandomizableEncryptedMessage[][]> mixerOutput;
private MixerOutput mixerOutput;
private boolean msgReceived;
private Throwable t;
private CompleteBatch msg;
@ -73,7 +74,7 @@ public class BatchHandler implements AsyncBulletinBoardClient.ClientCallback<Com
throw new Exception("in valid table");
}
}
return Arrays.asList(mixerOutput.b[mixerOutput.b.length - 1]);
return Arrays.asList(mixerOutput.getEncryptedMessages()[layers]);//there are layers + 1
}
}

6
mixer/src/main/java/main/MainMixing.java
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@ -2,6 +2,7 @@ package main;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeVerifier;
import meerkat.crypto.mixnet.Mixer;
import meerkat.crypto.mixnet.MixerOutput;
import meerkat.protobuf.BulletinBoardAPI;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Mixing;
@ -84,14 +85,13 @@ public class MainMixing {
mixerInput = null;
}
Pair<Mixing.ZeroKnowledgeProof[][], Crypto.RerandomizableEncryptedMessage[][]> mixerOutput
= mixer.mix(mixerInput);
MixerOutput mixerOutput = mixer.mix(mixerInput);
updateBB(mixerOutput, batchId, callback);
}
private void updateBB(Pair<Mixing.ZeroKnowledgeProof[][], Crypto.RerandomizableEncryptedMessage[][]> mixerOutput
private void updateBB(MixerOutput mixerOutput
, int batchId, AsyncBulletinBoardClient.ClientCallback<?> callback) {
BatchConverter batchConverter = new BatchConverter(n,layers);

68
mixer/src/main/java/mixer/Mixer.java
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@ -1,9 +1,13 @@
package mixer;
import java.math.*;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeVerifier;
import meerkat.crypto.mixnet.MixerOutput;
import qilin.primitives.concrete.ECGroup;
import qilin.util.Pair;
import java.util.Random;
@ -30,8 +34,14 @@ public class Mixer implements meerkat.crypto.mixnet.Mixer {
this.verifier = null;
}
public Mixer(Random rand, Mix2ZeroKnowledgeProver prov, Encryption enc,Mix2ZeroKnowledgeVerifier verifier) {
this.random = rand;
this.prover = prov;
this.encryptor = enc;
this.verifier = verifier;
}
public Pair<ZeroKnowledgeProof[][], RerandomizableEncryptedMessage[][]> mix(List<RerandomizableEncryptedMessage> ciphertexts) throws InvalidProtocolBufferException {
public MixerOutput mix(List<RerandomizableEncryptedMessage> ciphertexts) throws InvalidProtocolBufferException {
int n = ciphertexts.size();
int nDiv2 = n >> 1;
@ -42,7 +52,7 @@ public class Mixer implements meerkat.crypto.mixnet.Mixer {
//initialization
int layers = (int) (2 * Math.log(n) / Math.log(2)) - 1; // layers = 2logn -1
RerandomizableEncryptedMessage[][] encryptionTable = new RerandomizableEncryptedMessage[layers + 1][n];
ZeroKnowledgeProof[][] proofsTable = new ZeroKnowledgeProof[layers][nDiv2];
ZeroKnowledgeProof[][] proofsTable = new ZeroKnowledgeProof[layers][n];
int index1, index2, switchIndex = 0;
EncryptionRandomness r1, r2;
RerandomizableEncryptedMessage e1, e2;
@ -50,12 +60,14 @@ public class Mixer implements meerkat.crypto.mixnet.Mixer {
MixNetwork mixNetwork = new MixNetwork(new RandomPermutation(n,random));
Switch[] switchesLayer;
// set first level of encryption
EncryptionRandomness[][] randomnesses = new EncryptionRandomness[layers][n];
// set first level of encryption
for (int j = 0; j < n; j++) {
encryptionTable[0][j] = ciphertexts.get(j);
}
BigInteger time = BigInteger.valueOf(System.currentTimeMillis());
// main loop
for (int layer = 0; layer < layers; layer++)
{
@ -65,25 +77,45 @@ public class Mixer implements meerkat.crypto.mixnet.Mixer {
index2 = sw.j;
e1 = encryptionTable[layer][index1];
e2 = encryptionTable[layer][index2];
r1 = encryptor.generateRandomness(random);
r2 = encryptor.generateRandomness(random);
if (!sw.value) {
encryptionTable[layer + 1][index1] = encryptor.rerandomize(e1, r1);
encryptionTable[layer + 1][index2] = encryptor.rerandomize(e2, r2);
} else {
encryptionTable[layer + 1][index1] = encryptor.rerandomize(e2, r2);
encryptionTable[layer + 1][index2] = encryptor.rerandomize(e1, r1);
}
proofsTable[layer][switchIndex] =
prover.prove(e1, e2, encryptionTable[layer + 1][index1],
encryptionTable[layer + 1][index2],
sw.value, sw.i,sw.j,sw.layer, r1, r2);
r1 = encryptor.generateRandomness(random);
r2 = encryptor.generateRandomness(random);
if (!sw.value) {
encryptionTable[layer + 1][index1] = encryptor.rerandomize(e1, r1);
encryptionTable[layer + 1][index2] = encryptor.rerandomize(e2, r2);
switchIndex = (switchIndex + 1) % nDiv2;
} else {
encryptionTable[layer + 1][index1] = encryptor.rerandomize(e2, r2);
encryptionTable[layer + 1][index2] = encryptor.rerandomize(e1, r1);
}
randomnesses[layer][index1] = r1;
randomnesses[layer][index2] = r2;
}
}
return new Pair<ZeroKnowledgeProof[][], RerandomizableEncryptedMessage[][]>(proofsTable, encryptionTable);
System.out.println("re enc time : " + BigInteger.valueOf(System.currentTimeMillis()).subtract(time));
time = BigInteger.valueOf(System.currentTimeMillis());
// main loop
for (int layer = 0; layer < layers; layer++)
{
switchesLayer = mixNetwork.getSwitchesByLayer(layer);
for (Switch sw : switchesLayer) {
index1 = sw.i;
index2 = sw.j;
e1 = encryptionTable[layer][index1];
e2 = encryptionTable[layer][index2];
r1 = randomnesses[layer][index1];
r2 = randomnesses[layer][index2];
proofsTable[layer][switchIndex] =
prover.prove(e1, e2, encryptionTable[layer + 1][index1],
encryptionTable[layer + 1][index2],
sw.value, sw.i, sw.j, sw.layer, r1, r2);
switchIndex = (switchIndex + 1) % nDiv2;
}
}
System.out.println("zkp time : " + BigInteger.valueOf(System.currentTimeMillis()).subtract(time));
return new mixer.MixerOutput(n,layers,proofsTable, encryptionTable);
}
}

109
mixer/src/main/java/mixer/MixerOutput.java Normal file
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@ -0,0 +1,109 @@
package mixer;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Mixing;
import java.awt.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
/**
* Created by Tzlil on 1/18/2016.
*/
public class MixerOutput implements meerkat.crypto.mixnet.MixerOutput{
private final Mixing.ZeroKnowledgeProof[][] proofs;
private final Crypto.RerandomizableEncryptedMessage[][] encryptedMessages;
private final int n;
private final int layers;
public MixerOutput(int n,int layers,Mixing.ZeroKnowledgeProof[][] proofs, Crypto.RerandomizableEncryptedMessage[][] encryptedMessages) {
this.proofs = proofs;
this.encryptedMessages = encryptedMessages;
this.n = n;
this.layers = layers;
}
public MixerOutput(meerkat.crypto.mixnet.MixerOutput mixerOutput) {
this.proofs = mixerOutput.gerProofs();
this.encryptedMessages = mixerOutput.getEncryptedMessages();
this.n = mixerOutput.getN();
this.layers = (int) (2 * Math.log(n) / Math.log(2)) - 1; // layers = 2logn -1;
}
@Override
public Mixing.ZeroKnowledgeProof[][] gerProofs() {
return proofs;
}
@Override
public Crypto.RerandomizableEncryptedMessage[][] getEncryptedMessages() {
return encryptedMessages;
}
@Override
public int getN() {
return n;
}
public void outToFile(String dir) throws IOException {
(new File(dir)).mkdirs();
//create files
String proofsDir = dir + "/Proofs";
String encDir = dir + "/EncryptedMessages";
(new File(proofsDir)).mkdir();
(new File(encDir)).mkdir();
for (int layer = 0; layer < layers; layer++){
(new File(proofsDir +"/layer" + layer )).mkdir();
(new File(encDir +"/layer" + layer )).mkdir();
}
(new File(encDir +"/input")).mkdir();
for (int layer = 0; layer < layers; layer++){
for(int i = 0; i < proofs[layer].length; i ++){
writeProofToFile(proofsDir,proofs[layer][i]);
}
}
for (int layer = 0; layer <= layers; layer++){
for(int i = 0; i < encryptedMessages[layer].length; i ++){
writeEncToFile(encDir,layer - 1, i,encryptedMessages[layer][i]);
}
}
}
private void writeProofToFile(String proofsDir, Mixing.ZeroKnowledgeProof proof) throws IOException {
Mixing.ZeroKnowledgeProof.Location location = proof.getLocation();
int layer = location.getLayer();
int i = location.getI();
int j = location.getJ();
String fileName = proofsDir+"/layer" + layer +"/" + i +"_" + j;
File file = new File(fileName);
file.createNewFile();
FileOutputStream fos = new FileOutputStream(file);
fos.write(proof.toByteArray());
fos.close();
}
private void writeEncToFile(String encDir,int layer,int i, Crypto.RerandomizableEncryptedMessage enc) throws IOException {
String fileName;
if(layer >= 0)
fileName = encDir+"/layer" + layer +"/" + i;
else
fileName = encDir+"/input/" + i;
File file = new File(fileName);
file.createNewFile();
FileOutputStream fos = new FileOutputStream(file);
fos.write(enc.toByteArray());
fos.close();
}
}

239
mixer/src/main/java/prover/ElGamalProofOrganizer.java Normal file
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@ -0,0 +1,239 @@
package prover;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.concrete.ECElGamalEncryption;
import meerkat.protobuf.ConcreteCrypto;
import meerkat.protobuf.Crypto;
import org.bouncycastle.math.ec.ECPoint;
import qilin.primitives.concrete.ECGroup;
/**
* Created by Tzlil on 12/30/2015.
*/
public class ElGamalProofOrganizer {
private final ECGroup group;
private final ECPoint g;
private final ECPoint h;
private final byte[] gEncoded;
private final byte[] hEncoded;
public ElGamalProofOrganizer(ECGroup group, ECPoint g, ECPoint h){
this.group = group;
this.g = g;
this.h = h;
this.gEncoded = group.encode(g);
this.hEncoded = group.encode(h);
}
public enum OrProofOrder {
first, second, third, fourth
}
public enum TrueCouple {
left, right, unknown
}
//used by prover only
protected ElGamalProofInput createProofInput(Crypto.RerandomizableEncryptedMessage e1, Crypto.RerandomizableEncryptedMessage e2
, Crypto.RerandomizableEncryptedMessage e1New, Crypto.RerandomizableEncryptedMessage e2New
, Crypto.EncryptionRandomness r1, Crypto.EncryptionRandomness r2, boolean switched) throws InvalidProtocolBufferException {
//convert RerandomizableEncryptedMessage to ElGamalCiphertext
ConcreteCrypto.ElGamalCiphertext e1ElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(e1);
ConcreteCrypto.ElGamalCiphertext e2ElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(e2);
ConcreteCrypto.ElGamalCiphertext e1NewElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(e1New);
ConcreteCrypto.ElGamalCiphertext e2NewElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(e2New);
return new ElGamalProofInput(e1ElGamal,e2ElGamal,e1NewElGamal,e2NewElGamal,r1,r2,switched);
}
// can be used by anyone, e.g Verifier
public ElGamalProofInput createProofInput(Crypto.RerandomizableEncryptedMessage e1, Crypto.RerandomizableEncryptedMessage e2
, Crypto.RerandomizableEncryptedMessage e1New, Crypto.RerandomizableEncryptedMessage e2New) throws InvalidProtocolBufferException {
//convert RerandomizableEncryptedMessage to ElGamalCiphertext
ConcreteCrypto.ElGamalCiphertext e1ElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(e1);
ConcreteCrypto.ElGamalCiphertext e2ElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(e2);
ConcreteCrypto.ElGamalCiphertext e1NewElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(e1New);
ConcreteCrypto.ElGamalCiphertext e2NewElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(e2New);
return new ElGamalProofInput(e1ElGamal,e2ElGamal,e1NewElGamal,e2NewElGamal);
}
public class ElGamalProofInput {
private final OrProofInput first;
private final OrProofInput second;
private final OrProofInput third;
private final OrProofInput fourth;
private ECPoint convert2ECPoint(ByteString bs){
return group.decode(bs.toByteArray());
}
private ElGamalProofInput(ConcreteCrypto.ElGamalCiphertext e1, ConcreteCrypto.ElGamalCiphertext e2
, ConcreteCrypto.ElGamalCiphertext e1New, ConcreteCrypto.ElGamalCiphertext e2New
, Crypto.EncryptionRandomness r1, Crypto.EncryptionRandomness r2, boolean switched){
ECPoint e1c1 = convert2ECPoint(e1.getC1());
ECPoint e1c2 = convert2ECPoint(e1.getC2());
ECPoint e2c1 = convert2ECPoint(e2.getC1());
ECPoint e2c2 = convert2ECPoint(e2.getC2());
ECPoint e1Nc1 = convert2ECPoint(e1New.getC1());
ECPoint e1Nc2 = convert2ECPoint(e1New.getC2());
ECPoint e2Nc1 = convert2ECPoint(e2New.getC1());
ECPoint e2Nc2 = convert2ECPoint(e2New.getC2());
ECPoint c1_e1NDive1 = group.add(e1Nc1, group.negate(e1c1));
ECPoint c1_e2NDive1 = group.add(e2Nc1, group.negate(e1c1));
ECPoint c1_e1NDive2 = group.add(e1Nc1, group.negate(e2c1));
ECPoint c1_e2NDive2 = group.add(e2Nc1, group.negate(e2c1));
ECPoint c2_e1NDive1 = group.add(e1Nc2, group.negate(e1c2));
ECPoint c2_e2NDive1 = group.add(e2Nc2, group.negate(e1c2));
ECPoint c2_e1NDive2 = group.add(e1Nc2, group.negate(e2c2));
ECPoint c2_e2NDive2 = group.add(e2Nc2, group.negate(e2c2));
byte[] c1_e1NDive1Encoded = group.encode(c1_e1NDive1);
byte[] c1_e2NDive1Encoded = group.encode(c1_e2NDive1);
byte[] c1_e1NDive2Encoded = group.encode(c1_e1NDive2);
byte[] c1_e2NDive2Encoded = group.encode(c1_e2NDive2);
byte[] c2_e1NDive1Encoded = group.encode(c2_e1NDive1);
byte[] c2_e2NDive1Encoded = group.encode(c2_e2NDive1);
byte[] c2_e1NDive2Encoded = group.encode(c2_e1NDive2);
byte[] c2_e2NDive2Encoded = group.encode(c2_e2NDive2);
if (!switched) {
this.first = new OrProofInput(c1_e1NDive1,c2_e1NDive1,c1_e1NDive2,c2_e1NDive2
,c1_e1NDive1Encoded,c2_e1NDive1Encoded,c1_e1NDive2Encoded,c2_e1NDive2Encoded
,r1,TrueCouple.left);
this.second = new OrProofInput(c1_e1NDive1,c2_e1NDive1,c1_e2NDive1,c2_e2NDive1
,c1_e1NDive1Encoded,c2_e1NDive1Encoded,c1_e2NDive1Encoded,c2_e2NDive1Encoded
,r1,TrueCouple.left);
this.third = new OrProofInput(c1_e1NDive2,c2_e1NDive2,c1_e2NDive2,c2_e2NDive2
,c1_e1NDive2Encoded,c2_e1NDive2Encoded,c1_e2NDive2Encoded,c2_e2NDive2Encoded
,r2,TrueCouple.right);
this.fourth = new OrProofInput(c1_e2NDive1,c2_e2NDive1,c1_e2NDive2,c2_e2NDive2
,c1_e2NDive1Encoded,c2_e2NDive1Encoded,c1_e2NDive2Encoded,c2_e2NDive2Encoded
,r2,TrueCouple.right);
} else {
this.first = new OrProofInput(c1_e1NDive1,c2_e1NDive1,c1_e1NDive2,c2_e1NDive2
,c1_e1NDive1Encoded,c2_e1NDive1Encoded,c1_e1NDive2Encoded,c2_e1NDive2Encoded
,r2,TrueCouple.right);
this.second = new OrProofInput(c1_e1NDive1,c2_e1NDive1,c1_e2NDive1,c2_e2NDive1
,c1_e1NDive1Encoded,c2_e1NDive1Encoded,c1_e2NDive1Encoded,c2_e2NDive1Encoded
,r1,TrueCouple.right);
this.third = new OrProofInput(c1_e1NDive2,c2_e1NDive2,c1_e2NDive2,c2_e2NDive2
,c1_e1NDive2Encoded,c2_e1NDive2Encoded,c1_e2NDive2Encoded,c2_e2NDive2Encoded
,r2,TrueCouple.left);
this.fourth = new OrProofInput(c1_e2NDive1,c2_e2NDive1,c1_e2NDive2,c2_e2NDive2
,c1_e2NDive1Encoded,c2_e2NDive1Encoded,c1_e2NDive2Encoded,c2_e2NDive2Encoded
,r1,TrueCouple.left);
}
}
private ElGamalProofInput(ConcreteCrypto.ElGamalCiphertext e1, ConcreteCrypto.ElGamalCiphertext e2
, ConcreteCrypto.ElGamalCiphertext e1New, ConcreteCrypto.ElGamalCiphertext e2New){
ECPoint e1c1 = convert2ECPoint(e1.getC1());
ECPoint e1c2 = convert2ECPoint(e1.getC2());
ECPoint e2c1 = convert2ECPoint(e2.getC1());
ECPoint e2c2 = convert2ECPoint(e2.getC2());
ECPoint e1Nc1 = convert2ECPoint(e1New.getC1());
ECPoint e1Nc2 = convert2ECPoint(e1New.getC2());
ECPoint e2Nc1 = convert2ECPoint(e2New.getC1());
ECPoint e2Nc2 = convert2ECPoint(e2New.getC2());
ECPoint c1_e1NDive1 = group.add(e1Nc1, group.negate(e1c1));
ECPoint c1_e2NDive1 = group.add(e2Nc1, group.negate(e1c1));
ECPoint c1_e1NDive2 = group.add(e1Nc1, group.negate(e2c1));
ECPoint c1_e2NDive2 = group.add(e2Nc1, group.negate(e2c1));
ECPoint c2_e1NDive1 = group.add(e1Nc2, group.negate(e1c2));
ECPoint c2_e2NDive1 = group.add(e2Nc2, group.negate(e1c2));
ECPoint c2_e1NDive2 = group.add(e1Nc2, group.negate(e2c2));
ECPoint c2_e2NDive2 = group.add(e2Nc2, group.negate(e2c2));
this.first = new OrProofInput(c1_e1NDive1,c2_e1NDive1,c1_e1NDive2,c2_e1NDive2);
this.second = new OrProofInput(c1_e1NDive1,c2_e1NDive1,c1_e2NDive1,c2_e2NDive1);
this.third = new OrProofInput(c1_e1NDive2,c2_e1NDive2,c1_e2NDive2,c2_e2NDive2);
this.fourth = new OrProofInput(c1_e2NDive1,c2_e2NDive1,c1_e2NDive2,c2_e2NDive2);
}
public OrProofInput getOrProofInput(OrProofOrder orProofOrder) {
switch (orProofOrder) {
case first:
return this.first;
case second:
return this.second;
case third:
return this.third;
case fourth:
return this.fourth;
}
return null;
}
}
public class OrProofInput{
public final ECPoint g1;
public final ECPoint h1;
public final ECPoint g2;
public final ECPoint h2;
public final ECPoint g1Tag;
public final ECPoint h1Tag;
public final ECPoint g2Tag;
public final ECPoint h2Tag;
protected final byte[] g1Encoded;
protected final byte[] h1Encoded;
protected final byte[] g2Encoded;
protected final byte[] h2Encoded;
protected final byte[] g1TagEncoded;
protected final byte[] h1TagEncoded;
protected final byte[] g2TagEncoded;
protected final byte[] h2TagEncoded;
protected final Crypto.EncryptionRandomness x;
protected final TrueCouple flag;
private OrProofInput(ECPoint h1, ECPoint h2, ECPoint h1Tag, ECPoint h2Tag
,byte[] h1Encoded, byte[] h2Encoded, byte[] h1TagEncoded, byte[] h2TagEncoded
, Crypto.EncryptionRandomness x, TrueCouple flag) {
this.g1 = g;
this.h1 = h1;
this.g2 = h;
this.h2 = h2;
this.g1Tag = g;
this.h1Tag = h1Tag;
this.g2Tag = h;
this.h2Tag = h2Tag;
this.g1Encoded = gEncoded;
this.h1Encoded = h1Encoded;
this.g2Encoded = hEncoded;
this.h2Encoded = h2Encoded;
this.g1TagEncoded = gEncoded;
this.h1TagEncoded = h1TagEncoded;
this.g2TagEncoded = hEncoded;
this.h2TagEncoded = h2TagEncoded;
this.x = x;
this.flag = flag;
}
private OrProofInput(ECPoint h1, ECPoint h2, ECPoint h1Tag, ECPoint h2Tag) {
this(h1,h2,h1Tag,h2Tag,null,null,null,null,null,TrueCouple.unknown);
}
}
}

85
mixer/src/main/java/prover/ProofOrganizer.java
View File

@ -1,85 +0,0 @@
package prover;
import meerkat.protobuf.Crypto;
/**
* Created by Tzlil on 12/30/2015.
*/
public class ProofOrganizer {
private final OrProofInput first;
private final OrProofInput second;
private final OrProofInput third;
private final OrProofInput fourth;
protected ProofOrganizer(Crypto.RerandomizableEncryptedMessage e1,Crypto.RerandomizableEncryptedMessage e2
,Crypto.RerandomizableEncryptedMessage e1New,Crypto.RerandomizableEncryptedMessage e2New
,Crypto.EncryptionRandomness r1,Crypto.EncryptionRandomness r2,boolean switched) {
if(!switched) {
this.first = new OrProofInput(e1, e1New, e2, e1New, r1,TrueCouple.left);
this.second = new OrProofInput(e1, e1New, e1, e2New,r1,TrueCouple.left);
this.third = new OrProofInput(e2, e1New, e2, e2New,r2,TrueCouple.right);
this.fourth = new OrProofInput(e1, e2New, e2, e2New,r2,TrueCouple.right);
}else{
this.first = new OrProofInput(e1, e1New, e2, e1New, r2,TrueCouple.right);
this.second = new OrProofInput(e1, e1New, e1, e2New,r1,TrueCouple.right);
this.third = new OrProofInput(e2, e1New, e2, e2New,r2,TrueCouple.left);
this.fourth = new OrProofInput(e1, e2New, e2, e2New,r1,TrueCouple.left);
}
}
public ProofOrganizer(Crypto.RerandomizableEncryptedMessage e1,Crypto.RerandomizableEncryptedMessage e2
,Crypto.RerandomizableEncryptedMessage e1New,Crypto.RerandomizableEncryptedMessage e2New) {
this.first = new OrProofInput(e1, e1New, e2, e1New, null,TrueCouple.unknown);
this.second = new OrProofInput(e1, e1New, e1, e2New,null,TrueCouple.unknown);
this.third = new OrProofInput(e2, e1New, e2, e2New,null,TrueCouple.unknown);
this.fourth = new OrProofInput(e1, e2New, e2, e2New,null,TrueCouple.unknown);
}
public enum OrProofOrder{
first,second,third,fourth
}
public enum TrueCouple{
left,right,unknown
}
public OrProofInput getOrProofInput(OrProofOrder orProofOrder){
switch (orProofOrder){
case first:
return this.first;
case second:
return this.second;
case third:
return this.third;
case fourth:
return this.fourth;
}
return null;
}
public class OrProofInput{
public final Crypto.RerandomizableEncryptedMessage e1;
public final Crypto.RerandomizableEncryptedMessage e1New;
public final Crypto.RerandomizableEncryptedMessage e2;
public final Crypto.RerandomizableEncryptedMessage e2New;
protected final Crypto.EncryptionRandomness x;
protected final TrueCouple flag;
private OrProofInput(Crypto.RerandomizableEncryptedMessage e1, Crypto.RerandomizableEncryptedMessage e1New,
Crypto.RerandomizableEncryptedMessage e2, Crypto.RerandomizableEncryptedMessage e2New,
Crypto.EncryptionRandomness x, TrueCouple flag) {
this.e1 = e1;
this.e1New = e1New;
this.e2 = e2;
this.e2New = e2New;
this.x = x;
this.flag = flag;
}
}
}

136
mixer/src/main/java/prover/Prover.java
View File

@ -4,8 +4,6 @@ import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.concrete.ECElGamalEncryption;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeProver;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeVerifier;
import meerkat.protobuf.ConcreteCrypto;
import meerkat.protobuf.ConcreteCrypto.ElGamalCiphertext;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Mixing;
@ -14,7 +12,6 @@ import qilin.primitives.RandomOracle;
import qilin.primitives.concrete.ECGroup;
import java.math.BigInteger;
import java.util.List;
import java.util.Random;
public class Prover implements Mix2ZeroKnowledgeProver {
@ -24,6 +21,7 @@ public class Prover implements Mix2ZeroKnowledgeProver {
Random rand;
ECElGamalEncryption ecElGamalEncryption;
ECPoint g,h;
ElGamalProofOrganizer organizer;
public Prover(Random rand,ECElGamalEncryption encryptor,RandomOracle randomOracle) {
@ -33,10 +31,9 @@ public class Prover implements Mix2ZeroKnowledgeProver {
this.group = ecElGamalEncryption.getGroup();
this.g = group.getGenerator();
this.h = ecElGamalEncryption.getElGamalPK().getPK();
this.organizer = new ElGamalProofOrganizer(group,g,h);
}
public Mixing.ZeroKnowledgeProof prove(Crypto.RerandomizableEncryptedMessage in1,
Crypto.RerandomizableEncryptedMessage in2,
Crypto.RerandomizableEncryptedMessage out1,
@ -44,18 +41,14 @@ public class Prover implements Mix2ZeroKnowledgeProver {
boolean sw,int i,int j, int layer,
Crypto.EncryptionRandomness r1,
Crypto.EncryptionRandomness r2) throws InvalidProtocolBufferException {
Mixing.ZeroKnowledgeProof.OrProof first,second,third,fourth;
ProofOrganizer organizer = new ProofOrganizer(in1,in2,out1,out2,r1,r2,sw);
System.out.println("first");
first = createOrProof(organizer.getOrProofInput(ProofOrganizer.OrProofOrder.first));
System.out.println("second");
second = createOrProof(organizer.getOrProofInput(ProofOrganizer.OrProofOrder.second));
System.out.println("third");
third = createOrProof(organizer.getOrProofInput(ProofOrganizer.OrProofOrder.third));
System.out.println("fourth");
fourth = createOrProof(organizer.getOrProofInput(ProofOrganizer.OrProofOrder.fourth));
ElGamalProofOrganizer.ElGamalProofInput input = organizer.createProofInput(in1,in2,out1,out2,r1,r2,sw);
first = createOrProofElGamal(input.getOrProofInput(ElGamalProofOrganizer.OrProofOrder.first));
second = createOrProofElGamal(input.getOrProofInput(ElGamalProofOrganizer.OrProofOrder.second));
third = createOrProofElGamal(input.getOrProofInput(ElGamalProofOrganizer.OrProofOrder.third));
fourth = createOrProofElGamal(input.getOrProofInput(ElGamalProofOrganizer.OrProofOrder.fourth));
Mixing.ZeroKnowledgeProof.Location location = Mixing.ZeroKnowledgeProof.Location.newBuilder()
.setI(i)
@ -70,25 +63,9 @@ public class Prover implements Mix2ZeroKnowledgeProver {
.setFourth(fourth)
.setLocation(location)
.build();
return result;
}
private Mixing.ZeroKnowledgeProof.OrProof createOrProof(ProofOrganizer.OrProofInput orProofInput)
throws InvalidProtocolBufferException {
ElGamalCiphertext e1ElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(orProofInput.e1);
ElGamalCiphertext e2ElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(orProofInput.e2);
ElGamalCiphertext e1TagElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(orProofInput.e1New);
ElGamalCiphertext e2TagElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(orProofInput.e2New);
return createOrProofElGamal(e1ElGamal,e2ElGamal,e1TagElGamal,e2TagElGamal,orProofInput.x,orProofInput.flag);
}
private ECPoint convert2ECPoint(ByteString bs){
return group.decode(bs.toByteArray());
}
public BigInteger hash(Mixing.ZeroKnowledgeProof.OrProof.ForRandomOracle input) {
byte[] arr = input.toByteArray();
@ -96,28 +73,25 @@ public class Prover implements Mix2ZeroKnowledgeProver {
}
private Mixing.ZeroKnowledgeProof.OrProof createOrProofElGamal(ElGamalCiphertext e1,
ElGamalCiphertext e2,
ElGamalCiphertext e1New,
ElGamalCiphertext e2New,
Crypto.EncryptionRandomness x,
ProofOrganizer.TrueCouple flag) {
private Mixing.ZeroKnowledgeProof.OrProof createOrProofElGamal(ElGamalProofOrganizer.OrProofInput orProofInput) {
ECPoint g1 = g;
ECPoint h1 = group.add(convert2ECPoint(e1New.getC1()),group.negate(convert2ECPoint(e1.getC1())));
ECPoint g2 = h;
ECPoint h2 = group.add(convert2ECPoint(e1New.getC2()),group.negate(convert2ECPoint(e1.getC2())));
ECPoint g1 = orProofInput.g1;
ECPoint h1 = orProofInput.h1;
ECPoint g2 = orProofInput.g2;
ECPoint h2 = orProofInput.h2;
ECPoint g1Tag = g;
ECPoint h1Tag = group.add(convert2ECPoint(e2New.getC1()),group.negate(convert2ECPoint(e2.getC1())));
ECPoint g2Tag = h;
ECPoint h2Tag = group.add(convert2ECPoint(e2New.getC2()),group.negate(convert2ECPoint(e2.getC2())));
ECPoint g1Tag = orProofInput.g1Tag;
ECPoint h1Tag = orProofInput.h1Tag;
ECPoint g2Tag = orProofInput.g2Tag;
ECPoint h2Tag = orProofInput.h2Tag;
BigInteger r = new BigInteger(ecElGamalEncryption.generateRandomness(rand).getData().toByteArray()).mod(group.orderUpperBound());
BigInteger c1,c2,z,zTag;
ECPoint u,v,uTag,vTag;
Mixing.ZeroKnowledgeProof.OrProof.ForRandomOracle forRandomOracle;
switch (flag) {
switch (orProofInput.flag) {
case left:
c2 = new BigInteger(ecElGamalEncryption.generateRandomness(rand).getData().toByteArray()).mod(group.orderUpperBound());
zTag = new BigInteger(ecElGamalEncryption.generateRandomness(rand).getData().toByteArray()).mod(group.orderUpperBound());
@ -130,14 +104,14 @@ public class Prover implements Mix2ZeroKnowledgeProver {
// c1 = (hash(input + step1) + group size - c2)% group size
forRandomOracle =
Mixing.ZeroKnowledgeProof.OrProof.ForRandomOracle.newBuilder()
.setG1(ByteString.copyFrom(group.encode(g1)))
.setH1(ByteString.copyFrom(group.encode(h1)))
.setG2(ByteString.copyFrom(group.encode(g2)))
.setH2(ByteString.copyFrom(group.encode(h2)))
.setG1Tag(ByteString.copyFrom(group.encode(g1Tag)))
.setH1Tag(ByteString.copyFrom(group.encode(h1Tag)))
.setG2Tag(ByteString.copyFrom(group.encode(g2Tag)))
.setH2Tag(ByteString.copyFrom(group.encode(h2Tag)))
.setG1(ByteString.copyFrom(orProofInput.g1Encoded))
.setH1(ByteString.copyFrom(orProofInput.h1Encoded))
.setG2(ByteString.copyFrom(orProofInput.g2Encoded))
.setH2(ByteString.copyFrom(orProofInput.h2Encoded))
.setG1Tag(ByteString.copyFrom(orProofInput.g1TagEncoded))
.setH1Tag(ByteString.copyFrom(orProofInput.g1TagEncoded))
.setG2Tag(ByteString.copyFrom(orProofInput.g1TagEncoded))
.setH2Tag(ByteString.copyFrom(orProofInput.g1TagEncoded))
.setU(ByteString.copyFrom(group.encode(u)))
.setV(ByteString.copyFrom(group.encode(v)))
.setUTag(ByteString.copyFrom(group.encode(uTag)))
@ -146,7 +120,7 @@ public class Prover implements Mix2ZeroKnowledgeProver {
c1 = hash(forRandomOracle).add(group.orderUpperBound().subtract(c2)).mod(group.orderUpperBound());
//step 3
//z = (r + c1 * x) % group size;
z = r.add(c1.multiply(new BigInteger(x.getData().toByteArray()))).mod(group.orderUpperBound());
z = r.add(c1.multiply(new BigInteger(orProofInput.x.getData().toByteArray()))).mod(group.orderUpperBound());
break;
case right:
c1 = new BigInteger(ecElGamalEncryption.generateRandomness(rand).getData().toByteArray()).mod(group.orderUpperBound());
@ -160,14 +134,14 @@ public class Prover implements Mix2ZeroKnowledgeProver {
// c1 = (hash(input + step1) + group size - c1)% group size
forRandomOracle =
Mixing.ZeroKnowledgeProof.OrProof.ForRandomOracle.newBuilder()
.setG1(ByteString.copyFrom(group.encode(g1)))
.setH1(ByteString.copyFrom(group.encode(h1)))
.setG2(ByteString.copyFrom(group.encode(g2)))
.setH2(ByteString.copyFrom(group.encode(h2)))
.setG1Tag(ByteString.copyFrom(group.encode(g1Tag)))
.setH1Tag(ByteString.copyFrom(group.encode(h1Tag)))
.setG2Tag(ByteString.copyFrom(group.encode(g2Tag)))
.setH2Tag(ByteString.copyFrom(group.encode(h2Tag)))
.setG1(ByteString.copyFrom(orProofInput.g1Encoded))
.setH1(ByteString.copyFrom(orProofInput.h1Encoded))
.setG2(ByteString.copyFrom(orProofInput.g2Encoded))
.setH2(ByteString.copyFrom(orProofInput.h2Encoded))
.setG1Tag(ByteString.copyFrom(orProofInput.g1TagEncoded))
.setH1Tag(ByteString.copyFrom(orProofInput.g1TagEncoded))
.setG2Tag(ByteString.copyFrom(orProofInput.g1TagEncoded))
.setH2Tag(ByteString.copyFrom(orProofInput.g1TagEncoded))
.setU(ByteString.copyFrom(group.encode(u)))
.setV(ByteString.copyFrom(group.encode(v)))
.setUTag(ByteString.copyFrom(group.encode(uTag)))
@ -176,39 +150,37 @@ public class Prover implements Mix2ZeroKnowledgeProver {
c2 = hash(forRandomOracle).add(group.orderUpperBound().subtract(c1)).mod(group.orderUpperBound());
//step 3
//zTag = (r + c2 * x) % group size;
zTag = r.add(c2.multiply(new BigInteger(x.getData().toByteArray()))).mod(group.orderUpperBound());
zTag = r.add(c2.multiply(new BigInteger(orProofInput.x.getData().toByteArray()))).mod(group.orderUpperBound());
break;
default:
return null;
}
//debugging
assert (group.multiply(g1, z).equals(group.add(u, group.multiply(h1,c1))));
assert (group.multiply(g2, z).equals(group.add(v, group.multiply(h2,c1))));
assert (group.multiply(g1Tag, zTag).equals(group.add(uTag, group.multiply(h1Tag,c2))));
assert (group.multiply(g2Tag, zTag).equals(group.add(vTag, group.multiply(h2Tag,c2))));
//assert (group.multiply(g1, z).equals(group.add(u, group.multiply(h1,c1))));
//assert (group.multiply(g2, z).equals(group.add(v, group.multiply(h2,c1))));
//assert (group.multiply(g1Tag, zTag).equals(group.add(uTag, group.multiply(h1Tag,c2))));
//assert (group.multiply(g2Tag, zTag).equals(group.add(vTag, group.multiply(h2Tag,c2))));
return Mixing.ZeroKnowledgeProof.OrProof.newBuilder()
.setG1(ByteString.copyFrom(group.encode(g1)))
.setH1(ByteString.copyFrom(group.encode(h1)))
.setG2(ByteString.copyFrom(group.encode(g2)))
.setH2(ByteString.copyFrom(group.encode(h2)))
.setG1Tag(ByteString.copyFrom(group.encode(g1Tag)))
.setH1Tag(ByteString.copyFrom(group.encode(h1Tag)))
.setG2Tag(ByteString.copyFrom(group.encode(g2Tag)))
.setH2Tag(ByteString.copyFrom(group.encode(h2Tag)))
.setU(ByteString.copyFrom(group.encode(u)))
.setV(ByteString.copyFrom(group.encode(v)))
.setUTag(ByteString.copyFrom(group.encode(uTag)))
.setVTag(ByteString.copyFrom(group.encode(vTag)))
.setG1(forRandomOracle.getG1())
.setH1(forRandomOracle.getH1())
.setG2(forRandomOracle.getG2())
.setH2(forRandomOracle.getH2())
.setG1Tag(forRandomOracle.getG1())
.setH1Tag(forRandomOracle.getH1Tag())
.setG2Tag(forRandomOracle.getG2Tag())
.setH2Tag(forRandomOracle.getH2Tag())
.setU(forRandomOracle.getU())
.setV(forRandomOracle.getV())
.setUTag(forRandomOracle.getUTag())
.setVTag(forRandomOracle.getVTag())
.setC1(ByteString.copyFrom(c1.toByteArray()))
.setC2(ByteString.copyFrom(c2.toByteArray()))
.setZ(ByteString.copyFrom(z.toByteArray()))
.setZTag(ByteString.copyFrom(zTag.toByteArray()))
.build();
}
}

60
mixer/src/main/java/verifier/Verifier.java
View File

@ -8,7 +8,7 @@ import meerkat.protobuf.ConcreteCrypto.ElGamalCiphertext;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Mixing;
import org.bouncycastle.math.ec.ECPoint;
import prover.ProofOrganizer;
import prover.ElGamalProofOrganizer;
import qilin.primitives.RandomOracle;
import qilin.primitives.concrete.ECGroup;
@ -33,6 +33,7 @@ public class Verifier implements Mix2ZeroKnowledgeVerifier {
RandomOracle randomOracle;
ECElGamalEncryption encryptor;
ECPoint g,h;
ElGamalProofOrganizer organizer;
public Verifier(ECElGamalEncryption encryptor, RandomOracle randomOracle) {
this.encryptor = encryptor;
@ -40,6 +41,7 @@ public class Verifier implements Mix2ZeroKnowledgeVerifier {
this.g = group.getGenerator();
this.h = encryptor.getElGamalPK().getPK();
this.randomOracle = randomOracle;
this.organizer = new ElGamalProofOrganizer(group,g,h);
}
public BigInteger hash(Mixing.ZeroKnowledgeProof.OrProof.ForRandomOracle input) {
@ -57,26 +59,14 @@ public class Verifier implements Mix2ZeroKnowledgeVerifier {
Crypto.RerandomizableEncryptedMessage out1,
Crypto.RerandomizableEncryptedMessage out2,
Mixing.ZeroKnowledgeProof proof) throws InvalidProtocolBufferException {
ProofOrganizer organizer = new ProofOrganizer(in1,in2,out1,out2);
return verifyOrProof(organizer.getOrProofInput(ProofOrganizer.OrProofOrder.first), proof.getFirst())&&
verifyOrProof(organizer.getOrProofInput(ProofOrganizer.OrProofOrder.second), proof.getSecond())&&
verifyOrProof(organizer.getOrProofInput(ProofOrganizer.OrProofOrder.third), proof.getThird())&&
verifyOrProof(organizer.getOrProofInput(ProofOrganizer.OrProofOrder.fourth), proof.getFourth());
ElGamalProofOrganizer.ElGamalProofInput input = organizer.createProofInput(in1,in2,out1,out2);
return verifyElGamaOrProof(input.getOrProofInput(ElGamalProofOrganizer.OrProofOrder.first), proof.getFirst())&&
verifyElGamaOrProof(input.getOrProofInput(ElGamalProofOrganizer.OrProofOrder.second), proof.getSecond())&&
verifyElGamaOrProof(input.getOrProofInput(ElGamalProofOrganizer.OrProofOrder.third), proof.getThird())&&
verifyElGamaOrProof(input.getOrProofInput(ElGamalProofOrganizer.OrProofOrder.fourth), proof.getFourth());
}
public boolean verifyOrProof(ProofOrganizer.OrProofInput orProofInput, Mixing.ZeroKnowledgeProof.OrProof orProof)
throws InvalidProtocolBufferException {
ElGamalCiphertext e1ElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(orProofInput.e1);
ElGamalCiphertext e2ElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(orProofInput.e2);
ElGamalCiphertext e1TagElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(orProofInput.e1New);
ElGamalCiphertext e2TagElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(orProofInput.e2New);
return verifyElGamaOrProof(e1ElGamal,e2ElGamal,e1TagElGamal,e2TagElGamal,orProof);
}
private ECPoint g1,g2,h1,h2;
private ECPoint g1Tag,g2Tag,h1Tag,h2Tag;
private ECPoint u,v,uTag,vTag;
@ -117,23 +107,16 @@ public class Verifier implements Mix2ZeroKnowledgeVerifier {
zTag = new BigInteger(orProof.getZTag().toByteArray());
}
private List<Condition> createConditionsList(ElGamalCiphertext e1,
ElGamalCiphertext e2,
ElGamalCiphertext e1New,
ElGamalCiphertext e2New){
private List<Condition> createConditionsList(ElGamalProofOrganizer.OrProofInput orProofInput){
List<Condition> conditions = new ArrayList<Condition>();
conditions.add(new Condition<ECPoint>( g1,g,"g1 != g"));
conditions.add(new Condition<ECPoint>( h1,group.add(convert2ECPoint(e1New.getC1()),
group.negate(convert2ECPoint(e1.getC1()))),"h1 != e1New.c1/e1.c1"));
conditions.add(new Condition<ECPoint>( g2,h,"g2 != h"));
conditions.add(new Condition<ECPoint>( h2,group.add(convert2ECPoint(e1New.getC2()),
group.negate(convert2ECPoint(e1.getC2()))),"h2 != e1New.c2/e1.c2"));
conditions.add(new Condition<ECPoint>( g1Tag,g,"g1Tag != g"));
conditions.add(new Condition<ECPoint>( h1Tag,group.add(convert2ECPoint(e2New.getC1()),
group.negate(convert2ECPoint(e2.getC1()))),"h1Tag != e2New.c1/e2.c1"));
conditions.add(new Condition<ECPoint>( g2Tag,h,"g2Tag != h"));
conditions.add(new Condition<ECPoint>( h2Tag,group.add(convert2ECPoint(e2New.getC2()),
group.negate(convert2ECPoint(e2.getC2()))),"h2Tag != e2New.c2/e2.c2"));
conditions.add(new Condition<ECPoint>( g1,orProofInput.g1,"g1 != g"));
conditions.add(new Condition<ECPoint>( h1,orProofInput.h1,"h1 != e1New.c1/e1.c1"));
conditions.add(new Condition<ECPoint>( g2,orProofInput.g2,"g2 != h"));
conditions.add(new Condition<ECPoint>( h2,orProofInput.h2,"h2 != e1New.c2/e1.c2"));
conditions.add(new Condition<ECPoint>( g1Tag,orProofInput.g1Tag,"g1Tag != g"));
conditions.add(new Condition<ECPoint>( h1Tag,orProofInput.h1Tag,"h1Tag != e2New.c1/e2.c1"));
conditions.add(new Condition<ECPoint>( g2Tag,orProofInput.g2,"g2Tag != h"));
conditions.add(new Condition<ECPoint>( h2Tag,orProofInput.h2,"h2Tag != e2New.c2/e2.c2"));
conditions.add(new Condition<BigInteger>(c1.add(c2).mod(group.orderUpperBound()),
hash(forRandomOracle).mod(group.orderUpperBound()).mod(group.orderUpperBound()),
"(c1 + c2 ) % group size == hash (imput + step1) % group size"));
@ -148,14 +131,11 @@ public class Verifier implements Mix2ZeroKnowledgeVerifier {
return conditions;
}
public boolean verifyElGamaOrProof(ElGamalCiphertext e1,
ElGamalCiphertext e2,
ElGamalCiphertext e1New,
ElGamalCiphertext e2New,
Mixing.ZeroKnowledgeProof.OrProof orProof)
public boolean verifyElGamaOrProof(ElGamalProofOrganizer.OrProofInput orProofInput, Mixing.ZeroKnowledgeProof.OrProof orProof)
{
parseOrProof(orProof);
List<Condition> conditions = createConditionsList(e1,e2,e1New,e2New);
List<Condition> conditions = createConditionsList(orProofInput);
boolean result = true;
for (Condition condition: conditions) {

9
mixer/src/main/java/verifier/VerifyTable.java
View File

@ -2,6 +2,7 @@ package verifier;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeVerifier;
import meerkat.crypto.mixnet.MixerOutput;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Mixing;
import qilin.util.Pair;
@ -13,8 +14,8 @@ import java.util.Arrays;
*/
public final class VerifyTable {
public static boolean verifyTable(Mix2ZeroKnowledgeVerifier verifier,int n,Pair<Mixing.ZeroKnowledgeProof[][]
,Crypto.RerandomizableEncryptedMessage[][]> mixerOutput) throws InvalidProtocolBufferException {
public static boolean verifyTable(Mix2ZeroKnowledgeVerifier verifier,int n,MixerOutput mixerOutput)
throws InvalidProtocolBufferException {
int index1,index2,layer;
//assert n = 2^k
@ -29,8 +30,8 @@ public final class VerifyTable {
Arrays.fill(locationChecksumLayer,false);
}
Mixing.ZeroKnowledgeProof[][] zeroKnowledgeProofs = mixerOutput.a;
Crypto.RerandomizableEncryptedMessage[][] rerandomizableEncryptedMessages = mixerOutput.b;
Mixing.ZeroKnowledgeProof[][] zeroKnowledgeProofs = mixerOutput.gerProofs();
Crypto.RerandomizableEncryptedMessage[][] rerandomizableEncryptedMessages = mixerOutput.getEncryptedMessages();
for (Mixing.ZeroKnowledgeProof[] zkpLayer: zeroKnowledgeProofs) {
for (Mixing.ZeroKnowledgeProof zkp: zkpLayer) {

100
mixer/src/test/java/mixer/CreateTestVector.java Normal file
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@ -0,0 +1,100 @@
package mixer;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.concrete.ECElGamalEncryption;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeProver;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeVerifier;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Voting;
import org.junit.Before;
import org.junit.Test;
import prover.Prover;
import qilin.primitives.RandomOracle;
import qilin.primitives.concrete.DigestOracle;
import qilin.primitives.concrete.ECElGamal;
import qilin.primitives.concrete.ECGroup;
import verifier.Verifier;
import verifier.VerifyTable;
import java.io.IOException;
import java.security.spec.InvalidKeySpecException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* Created by Tzlil on 1/19/2016.
*/
public class CreateTestVector {
ECElGamalEncryption encryptor;
ECGroup group;
Random random,randomMixer,randomProver;
RandomOracle randomOracle;
Mix2ZeroKnowledgeVerifier verifier;
Mix2ZeroKnowledgeProver prover;
meerkat.crypto.mixnet.Mixer mixer;
private int layers;
private int n;
@Before
public void setup() throws InvalidKeySpecException {
// initialization
random = new Random();
group = new ECGroup("secp256k1");
encryptor = new ECElGamalEncryption();
encryptor.init(Utiles.serializePk(group, new ECElGamal.SK(group, ECElGamal.generateSecretKey(group, random))));
randomMixer = new Random();
randomProver = new Random();
randomOracle = new DigestOracle();
verifier = new Verifier(encryptor,randomOracle);
prover = new Prover(randomProver,encryptor,randomOracle);
mixer = new Mixer(randomMixer,prover,encryptor,verifier);
// generate n
int logN = 10; // + random.nextInt(8)
layers = 2*logN - 1;
n = 1 << logN;
}
public List<Crypto.RerandomizableEncryptedMessage> generateMixerInput(){
List<Crypto.RerandomizableEncryptedMessage> result = new ArrayList<Crypto.RerandomizableEncryptedMessage>();
Voting.PlaintextBallot msg;
for (int i = 0; i < n ; i++){
msg = Utiles.genRandomBallot(2,3,16);
result.add(encryptor.encrypt(msg, encryptor.generateRandomness(random)));
}
return result;
}
//@Test
public void createValidTest() throws IOException {
List<Crypto.RerandomizableEncryptedMessage> mixerInput = generateMixerInput();
System.out.println("start mixing");
MixerOutput mixerOutput = new MixerOutput(mixer.mix(mixerInput));
System.out.println("mixing ended, start verification");
assert (VerifyTable.verifyTable(verifier,n,mixerOutput));
System.out.println("verification ended, start printing");
mixerOutput.outToFile("C:\\Users\\Tzlil\\Desktop\\TestVector\\Test3");
System.out.println("all done");
}
//@Test
public void createInvalidTest() throws IOException {
//Mix2ZeroKnowledgeVerifier corruptedVerifier = new Verifier(encryptor,randomOracle,true);
//Mix2ZeroKnowledgeProver corruptedProver = new Prover(randomProver,encryptor,randomOracle,true);
//mixer = new Mixer(randomMixer,corruptedProver,encryptor,corruptedVerifier);
List<Crypto.RerandomizableEncryptedMessage> mixerInput = generateMixerInput();
System.out.println("start mixing");
MixerOutput mixerOutput = new MixerOutput(mixer.mix(mixerInput));
System.out.println("mixing ended, start negative verification");
assert (!VerifyTable.verifyTable(verifier,n,mixerOutput));
System.out.println("verification ended, start printing");
mixerOutput.outToFile("C:\\Users\\Tzlil\\Desktop\\TestVector\\Test5");
System.out.println("all done");
}
}

25
mixer/src/test/java/mixer/MixingText.java
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@ -6,8 +6,7 @@ package mixer;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.concrete.ECElGamalEncryption;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeProver;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeVerifier;
import meerkat.crypto.mixnet.*;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Mixing;
import meerkat.protobuf.Voting;
@ -33,7 +32,7 @@ public class MixingText {
Random random,randomMixer,randomProver;
RandomOracle randomOracle;
Mix2ZeroKnowledgeVerifier verifier;
Mix2ZeroKnowledgeProver prover;
Prover prover;
meerkat.crypto.mixnet.Mixer mixer;
private int layers;
private int n;
@ -54,7 +53,7 @@ public class MixingText {
mixer = new Mixer(randomMixer,prover,encryptor);
// generate n
int logN = 8; // + random.nextInt(8)
int logN = 10; // + random.nextInt(8)
layers = 2*logN - 1;
n = 1 << logN;
}
@ -71,7 +70,23 @@ public class MixingText {
@Test
public void mixingTest() throws InvalidProtocolBufferException {
Pair<Mixing.ZeroKnowledgeProof[][], Crypto.RerandomizableEncryptedMessage[][]> mixerOutput = mixer.mix(generateMixerInput());
System.out.println("n is : " + n);
System.out.println(" generating input");
List<Crypto.RerandomizableEncryptedMessage> mixerInput = generateMixerInput();
System.out.println(" start mixing");
long startTime = System.currentTimeMillis();
meerkat.crypto.mixnet.MixerOutput mixerOutput = mixer.mix(mixerInput);
long finishTime = System.currentTimeMillis();
System.out.println(" that took: "+(finishTime-startTime)+ " ms");
System.out.println("start verification");
startTime = System.currentTimeMillis();
assert (VerifyTable.verifyTable(verifier,n,mixerOutput));
finishTime = System.currentTimeMillis();
System.out.println(" that took: "+(finishTime-startTime)+ " ms");
}
}

4
mixer/src/test/java/mixer/RerandomizeTest.java
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@ -67,8 +67,8 @@ public class RerandomizeTest {
ConcreteCrypto.ElGamalCiphertext eNewElGamal = ECElGamalEncryption.rerandomizableEncryptedMessage2ElGamalCiphertext(eNew);
assert (g.multiply(new BigInteger(r.getData().toByteArray())).equals(
group.add(convert2ECPoint(eNewElGamal.getC1()),group.negate(convert2ECPoint(eElGamal.getC1())))));
assert (h.multiply(new BigInteger(r.getData().toByteArray())).equals(
group.add(convert2ECPoint(eNewElGamal.getC1()),group.negate(convert2ECPoint(eElGamal.getC1())))));
assert(h.multiply(new BigInteger(r.getData().toByteArray())).equals(
group.add(convert2ECPoint(eNewElGamal.getC2()), group.negate(convert2ECPoint(eElGamal.getC2())))));
}

65
mixer/src/test/java/profiling/ECGroupProfiling/AddProfiling.java Normal file
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@ -0,0 +1,65 @@
package profiling.ECGroupProfiling;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.concrete.ECElGamalEncryption;
import mixer.Utiles;
import org.bouncycastle.math.ec.ECPoint;
import org.junit.Before;
import org.junit.Test;
import qilin.primitives.concrete.ECElGamal;
import qilin.primitives.concrete.ECGroup;
import java.security.spec.InvalidKeySpecException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* Created by Tzlil on 1/20/2016.
*/
public class AddProfiling {
ECElGamalEncryption encryptor;
ECGroup group;
Random random;
private int n;
List<ECPoint> members1;
List<ECPoint> members2;
@Before
public void setup() throws InvalidKeySpecException {
// initialization
random = new Random();
group = new ECGroup("secp256k1");
encryptor = new ECElGamalEncryption();
encryptor.init(Utiles.serializePk(group, new ECElGamal.SK(group, ECElGamal.generateSecretKey(group, random))));
// generate n;
int sqrtn = 128;
n = sqrtn*sqrtn;
members1 = new ArrayList<ECPoint>(sqrtn);
members2 = new ArrayList<ECPoint>(sqrtn);
for (int i = 0 ; i < sqrtn; i ++){
members1.add(group.sample(random));
members2.add(group.sample(random));
}
}
@Test
public void addProfiling() throws InvalidProtocolBufferException {
System.out.println("Add");
System.out.println("n is : " + n);
System.out.println("start n operations");
long startTime = System.currentTimeMillis();
for (ECPoint member1: members1) {
for (ECPoint member2: members2) {
group.add(member1,member2);
}
}
long finishTime = System.currentTimeMillis();
System.out.println(" that took: "+(finishTime-startTime)+ " ms");
System.out.println(" avg of"+((double)(finishTime-startTime))/(n * n)+ " ms");
}
}

59
mixer/src/test/java/profiling/ECGroupProfiling/EncodeProfiling.java Normal file
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@ -0,0 +1,59 @@
package profiling.ECGroupProfiling;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.concrete.ECElGamalEncryption;
import mixer.Utiles;
import org.bouncycastle.math.ec.ECPoint;
import org.junit.Before;
import org.junit.Test;
import qilin.primitives.concrete.ECElGamal;
import qilin.primitives.concrete.ECGroup;
import java.security.spec.InvalidKeySpecException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* Created by Tzlil on 1/20/2016.
*/
public class EncodeProfiling {
ECElGamalEncryption encryptor;
ECGroup group;
Random random;
private int n;
List<ECPoint> members;
@Before
public void setup() throws InvalidKeySpecException {
// initialization
random = new Random();
group = new ECGroup("secp256k1");
encryptor = new ECElGamalEncryption();
encryptor.init(Utiles.serializePk(group, new ECElGamal.SK(group, ECElGamal.generateSecretKey(group, random))));
// generate n;
int sqrtn = 128;
n = sqrtn*sqrtn;
members = new ArrayList<ECPoint>(n);
for (int i = 0 ; i < n; i ++){
members.add(group.sample(random));
}
}
@Test
public void encodeProfiling() throws InvalidProtocolBufferException {
System.out.println("Encode");
System.out.println("n is : " + n);
System.out.println("start n operations");
long startTime = System.currentTimeMillis();
for (ECPoint member: members) {
group.encode(member);
}
long finishTime = System.currentTimeMillis();
System.out.println(" that took: "+(finishTime-startTime)+ " ms");
System.out.println(" avg of"+((double)(finishTime-startTime))/(n * n)+ " ms");
}
}

81
mixer/src/test/java/profiling/ECGroupProfiling/MulProfiling.java Normal file
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@ -0,0 +1,81 @@
package profiling.ECGroupProfiling;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.concrete.ECElGamalEncryption;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeVerifier;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Voting;
import mixer.Mixer;
import mixer.Utiles;
import org.bouncycastle.math.ec.ECPoint;
import org.junit.Before;
import org.junit.Test;
import prover.Prover;
import qilin.primitives.RandomOracle;
import qilin.primitives.concrete.DigestOracle;
import qilin.primitives.concrete.ECElGamal;
import qilin.primitives.concrete.ECGroup;
import verifier.Verifier;
import verifier.VerifyTable;
import java.math.BigInteger;
import java.security.spec.InvalidKeySpecException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* Created by Tzlil on 1/19/2016.
*/
public class MulProfiling {
ECElGamalEncryption encryptor;
ECGroup group;
Random random;
private int n;
List<ECPoint> members;
List<BigInteger> randomnesses;
@Before
public void setup() throws InvalidKeySpecException {
// initialization
random = new Random();
group = new ECGroup("secp256k1");
encryptor = new ECElGamalEncryption();
encryptor.init(Utiles.serializePk(group, new ECElGamal.SK(group, ECElGamal.generateSecretKey(group, random))));
// generate n
int sqrtn = 128;
n = sqrtn*sqrtn;
members = new ArrayList<ECPoint>(sqrtn);
randomnesses = new ArrayList<BigInteger>(sqrtn);
byte[] arr = new byte[256];
for (int i = 0 ; i < sqrtn; i ++){
members.add(group.sample(random));
random.nextBytes(arr);
randomnesses.add(new BigInteger(arr));
}
}
@Test
public void mulProfiling() throws InvalidProtocolBufferException {
System.out.println("Multiply");
System.out.println("n is : " + n);
System.out.println("start n operations");
long startTime = System.currentTimeMillis();
for(ECPoint member:members) {
for (BigInteger rand : randomnesses) {
group.multiply(member, rand);
}
}
long finishTime = System.currentTimeMillis();
System.out.println(" that took: "+(finishTime-startTime)+ " ms");
System.out.println(" avg of"+((double)(finishTime-startTime))/(n*n)+ " ms");
}
}

59
mixer/src/test/java/profiling/ECGroupProfiling/NegateProfiling.java Normal file
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@ -0,0 +1,59 @@
package profiling.ECGroupProfiling;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.concrete.ECElGamalEncryption;
import mixer.Utiles;
import org.bouncycastle.math.ec.ECPoint;
import org.junit.Before;
import org.junit.Test;
import qilin.primitives.concrete.ECElGamal;
import qilin.primitives.concrete.ECGroup;
import java.security.spec.InvalidKeySpecException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* Created by Tzlil on 1/20/2016.
*/
public class NegateProfiling {
ECElGamalEncryption encryptor;
ECGroup group;
Random random;
private int n;
List<ECPoint> members;
@Before
public void setup() throws InvalidKeySpecException {
// initialization
random = new Random();
group = new ECGroup("secp256k1");
encryptor = new ECElGamalEncryption();
encryptor.init(Utiles.serializePk(group, new ECElGamal.SK(group, ECElGamal.generateSecretKey(group, random))));
// generate n;
int sqrtn = 128;
n = sqrtn*sqrtn;
members = new ArrayList<ECPoint>(n);
for (int i = 0 ; i < n; i ++){
members.add(group.sample(random));
}
}
@Test
public void negProfiling() throws InvalidProtocolBufferException {
System.out.println("Neg");
System.out.println("n is : " + n);
System.out.println("start n operations");
long startTime = System.currentTimeMillis();
for (ECPoint member: members) {
group.negate(member);
}
long finishTime = System.currentTimeMillis();
System.out.println(" that took: "+(finishTime-startTime)+ " ms");
System.out.println(" avg of"+((double)(finishTime-startTime))/(n * n)+ " ms");
}
}

79
mixer/src/test/java/profiling/RerandomizeProfiling.java Normal file
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@ -0,0 +1,79 @@
package profiling;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.concrete.ECElGamalEncryption;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeProver;
import meerkat.protobuf.ConcreteCrypto;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Voting;
import mixer.Utiles;
import org.bouncycastle.math.ec.ECPoint;
import org.junit.Before;
import org.junit.Test;
import prover.Prover;
import qilin.primitives.RandomOracle;
import qilin.primitives.concrete.DigestOracle;
import qilin.primitives.concrete.ECElGamal;
import qilin.primitives.concrete.ECGroup;
import java.math.BigInteger;
import java.util.Random;
/**
* Created by Tzlil on 1/20/2016.
*/
public class RerandomizeProfiling {
Random rand;
ECElGamal.SK key;
ECGroup group;
ECElGamalEncryption enc;
ConcreteCrypto.ElGamalPublicKey serializedPk;
int n;
Crypto.EncryptionRandomness[] randomnesses;
Crypto.RerandomizableEncryptedMessage[] encryptedMessage;
@Before
public void setup() throws Exception {
rand = new Random();
group = new ECGroup("secp256k1");
BigInteger sk = ECElGamal.generateSecretKey(group, rand);
key = new ECElGamal.SK(group, sk);
serializedPk = Utiles.serializePk(group, key);
enc = new ECElGamalEncryption();
enc.init(serializedPk);
n = 1024 * 18;
randomnesses = new Crypto.EncryptionRandomness[n];
encryptedMessage = new Crypto.RerandomizableEncryptedMessage[n];
Voting.PlaintextBallot msg;
for (int i = 0; i < n ; i ++){
msg = Utiles.genRandomBallot(2,3,16);
randomnesses[i] = enc.generateRandomness(rand);
encryptedMessage[i] = enc.encrypt(msg, enc.generateRandomness(rand));
}
}
private ECPoint convert2ECPoint(ByteString bs){
return group.decode(bs.toByteArray());
}
@Test
public void RerandomizeProfiling() throws InvalidProtocolBufferException {
System.out.println("Rerandomiz");
System.out.println("n is : " + n);
System.out.println("start n operations");
long startTime = System.currentTimeMillis();
for (int i = 0; i < n ; i ++){
enc.rerandomize(encryptedMessage[i],randomnesses[i]);
}
long finishTime = System.currentTimeMillis();
System.out.println(" that took: "+(finishTime-startTime)+ " ms");
System.out.println(" avg of"+((double)(finishTime-startTime))/n + " ms");
}
}

87
mixer/src/test/java/profiling/ZeroKnowledgeProofProfiling.java Normal file
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@ -0,0 +1,87 @@
package profiling;
import com.google.protobuf.ByteString;
import com.google.protobuf.InvalidProtocolBufferException;
import meerkat.crypto.concrete.ECElGamalEncryption;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeProver;
import meerkat.crypto.mixnet.Mix2ZeroKnowledgeVerifier;
import meerkat.protobuf.ConcreteCrypto;
import meerkat.protobuf.Crypto;
import meerkat.protobuf.Voting;
import mixer.Utiles;
import org.bouncycastle.math.ec.ECPoint;
import org.junit.Before;
import org.junit.Test;
import prover.Prover;
import qilin.primitives.RandomOracle;
import qilin.primitives.concrete.DigestOracle;
import qilin.primitives.concrete.ECElGamal;
import qilin.primitives.concrete.ECGroup;
import java.math.BigInteger;
import java.util.Random;
/**
* Created by Tzlil on 1/20/2016.
*/
public class ZeroKnowledgeProofProfiling {
Random rand;
ECElGamal.SK key;
ECGroup group;
ECElGamalEncryption enc;
ConcreteCrypto.ElGamalPublicKey serializedPk;
Mix2ZeroKnowledgeProver prover ;
int n;
Crypto.EncryptionRandomness[] randomnesses;
Crypto.RerandomizableEncryptedMessage[] encryptedMessage;
Crypto.RerandomizableEncryptedMessage[] reencryptedMessage;
@Before
public void setup() throws Exception {
rand = new Random();
group = new ECGroup("secp256k1");
BigInteger sk = ECElGamal.generateSecretKey(group, rand);
key = new ECElGamal.SK(group, sk);
serializedPk = Utiles.serializePk(group, key);
enc = new ECElGamalEncryption();
enc.init(serializedPk);
RandomOracle randomOracle = new DigestOracle();
prover = new Prover(new Random(),enc,randomOracle);
n = 512 * 18;
randomnesses = new Crypto.EncryptionRandomness[n*2];
encryptedMessage = new Crypto.RerandomizableEncryptedMessage[n*2];
reencryptedMessage = new Crypto.RerandomizableEncryptedMessage[n*2];
Voting.PlaintextBallot msg;
for (int i = 0; i < n*2 ; i ++){
msg = Utiles.genRandomBallot(2,3,16);
randomnesses[i] = enc.generateRandomness(rand);
encryptedMessage[i] = enc.encrypt(msg, enc.generateRandomness(rand));
reencryptedMessage[i] = enc.rerandomize(encryptedMessage[i], randomnesses[i]);
}
}
private ECPoint convert2ECPoint(ByteString bs){
return group.decode(bs.toByteArray());
}
@Test
public void zeroKnowledgeProofTest() throws InvalidProtocolBufferException {
System.out.println("Prove");
System.out.println("n is : " + n);
System.out.println("start n proves");
long startTime = System.currentTimeMillis();
for (int i = 0; i < n*2 ; i +=2){
prover.prove(encryptedMessage[i],encryptedMessage[i+1],reencryptedMessage[i],reencryptedMessage[i+1],
false,0,0,0,randomnesses[i],randomnesses[i+1]);
}
long finishTime = System.currentTimeMillis();
System.out.println(" that took: "+(finishTime-startTime)+ " ms");
System.out.println(" avg of"+((double)(finishTime-startTime))/n + " ms");
}
}