89 lines
3.4 KiB
Java
89 lines
3.4 KiB
Java
package verifier;
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import com.google.protobuf.InvalidProtocolBufferException;
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import meerkat.crypto.mixnet.Mix2ZeroKnowledgeVerifier;
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import meerkat.crypto.mixnet.MixerOutput;
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import meerkat.protobuf.Crypto;
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import meerkat.protobuf.Mixing;
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import java.util.Arrays;
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/**
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* Created by Tzlil on 12/30/2015.
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*/
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public final class VerifyTable {
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public static boolean verifyTable(Mix2ZeroKnowledgeVerifier verifier,int n,MixerOutput mixerOutput)
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throws InvalidProtocolBufferException {
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int index1,index2,layer;
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//assert n = 2^k
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if ( (n &(n-1)) != 0)
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throw new IllegalArgumentException("n");
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int layers = 2*(int)(Math.log(n) / Math.log(2)) - 1;
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//initialize locationChecksum table
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// use for check BeneshNet validity
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boolean[][] locationChecksum = new boolean[layers][n];
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for (boolean[] locationChecksumLayer: locationChecksum) {
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Arrays.fill(locationChecksumLayer,false);
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}
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Mixing.ZeroKnowledgeProof[][] zeroKnowledgeProofs = mixerOutput.getProofs();
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Crypto.RerandomizableEncryptedMessage[][] rerandomizableEncryptedMessages = mixerOutput.getEncryptedMessages();
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for (int i = 0; i < zeroKnowledgeProofs.length ; i++){
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for (int j = 0; j < zeroKnowledgeProofs[i].length ; j ++){
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Mixing.ZeroKnowledgeProof zkp = zeroKnowledgeProofs[i][j];
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if(zkp == null){
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int ttt = 1;
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ttt++;
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}
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Mixing.ZeroKnowledgeProof.Location location = zkp.getLocation();
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index1 = location.getI();
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index2 = location.getJ();
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layer = location.getLayer();
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// check location validity
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if (layer > layers >> 1) {
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if (index2 - index1 != n >> (layers - layer))
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return false;
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}
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else{
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if (index2 - index1 != n >> (layer + 1))
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return false;
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}
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// mark location in table
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locationChecksum[layer][index1] = true;
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locationChecksum[layer][index2] = true;
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// verify proof
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if(!verifier.verify(rerandomizableEncryptedMessages[layer][index1],
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rerandomizableEncryptedMessages[layer][index2],
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rerandomizableEncryptedMessages[layer + 1][index1],
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rerandomizableEncryptedMessages[layer + 1][index2],
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zkp)) {
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verifier.verify(rerandomizableEncryptedMessages[layer][index1],
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rerandomizableEncryptedMessages[layer][index2],
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rerandomizableEncryptedMessages[layer + 1][index1],
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rerandomizableEncryptedMessages[layer + 1][index2],
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zkp);
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System.out.print("\n\n\nlayer " + layer + " i , j " + index1 + " , " + index2 + "\n\n\n");
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return false;
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}
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}
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}
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// verify all necessary locations for BeneshNet were proved
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for (boolean[] checksumLayer: locationChecksum) {
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for (boolean locationBoolean: checksumLayer) {
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if (!locationBoolean)
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return false;
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}
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}
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return true;
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}
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}
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