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genopri-shcs/project/PPPCommons/src/crypto/elgamal/EvalEC.java
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EvalEC.java
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package crypto.elgamal;
import java.math.BigInteger;
import java.util.Enumeration;
import java.util.Random;
import org.bouncycastle.asn1.nist.NISTNamedCurves;
import test.ECPointCompressionTest;
import crypto.elgamal.fragment.FragmentEncoded;
import crypto.elgamal.fragment.FragmentEncrypted;
import crypto.elgamal.fragment.FragmentPartial;
public class EvalEC {
public static final int COMBINATION_SIZE = 20;
public static final int NUMBER_TESTS = 100;
/**
* @param args
*/
public static void main(String[] args) {
// evalCurves();
runtimesEncDec();
// ECElGamal ecceg = new ECElGamal(NISTNamedCurves.getByName("P-521"));
// ecceg.initReverseDLTable();
//
// for (int i = 0; i < 20; i++) {
// timeDecrypt(ecceg);
// }
}
private static void runtimesEncDec() {
String curveName = "P-384";
ECCEGKeyGenerator keygen = new ECCEGKeyGenerator(curveName);
KeyPair keypair = keygen.generateKey();
ECElGamal eccegMU = new ECElGamal(curveName);
ECElGamal eccegSPU = new ECElGamal(curveName);
ECElGamal eccegFull = new ECElGamal(curveName);
eccegMU.setpPubKey(keypair.getPubKey());
eccegSPU.setpPubKey(keypair.getPubKey());
eccegMU.setSecretShare(keypair.getSecretMU());
eccegSPU.setSecretShare(keypair.getSecretSPU());
eccegFull.setPrivKey(keypair.getPrivKey());
eccegMU.initReverseDLTable();
BigInteger[] numbers = generateListBigInt(100);
FragmentEncrypted[] encrypted = new FragmentEncrypted[numbers.length];
FragmentPartial[] partials = new FragmentPartial[encrypted.length];
BigInteger[] numbersDec = new BigInteger[partials.length];
// test encryption
long startEnc = System.currentTimeMillis();
for (int i = 0; i < numbers.length; i++) {
BigInteger n = numbers[i];
encrypted[i] = eccegFull.encrypt(n);
}
long endEnc = System.currentTimeMillis();
// test partial decryption
long startPartDec = System.currentTimeMillis();
for (int i = 0; i < encrypted.length; i++) {
partials[i] = eccegSPU.partialDecrypt(encrypted[i]);
}
long endPartDec = System.currentTimeMillis();
// test full decryption
long startFullDec = System.currentTimeMillis();
for (int i = 0; i < partials.length; i++) {
numbersDec[i] = eccegMU.fullyDecrypt(partials[i]);
}
long endFullDec = System.currentTimeMillis();
// sanity check
for (int i = 0; i < numbers.length; i++) {
if (!numbers[i].equals(numbersDec[i])) {
System.out.println("Error: Orig=" + numbers[i] + "; Dec=" + numbersDec[i]);
throw new IllegalStateException("Should not happen");
}
}
System.out.println("Enc=" + (endEnc-startEnc)
+ "; PartDec=" + (endPartDec - startPartDec)
+ "; FullDec=" + (endFullDec - startFullDec));
}
private static BigInteger[] generateListBigInt(int n) {
BigInteger[] numbers = new BigInteger[n];
Random rand = new Random();
for (int i = 0; i < numbers.length; i++) {
numbers[i] = new BigInteger(11, rand);
}
return numbers;
}
private static void timeDecrypt(ECElGamal ecceg) {
BigInteger[] msgs = new BigInteger[256];
FragmentEncrypted[] encrypted = new FragmentEncrypted[msgs.length];
BigInteger[] dec = new BigInteger[msgs.length];
for (int i = 0; i < msgs.length; i++) {
msgs[i] = BigInteger.valueOf(i);
}
long startTimeEnc = System.currentTimeMillis();
for (int i = 0; i < msgs.length; i++) {
encrypted[i] = ecceg.encrypt(msgs[i]);
}
long endTimeEnc = System.currentTimeMillis();
long startTimeDec = System.currentTimeMillis();
for (int i = 0; i < dec.length; i++) {
dec[i] = ecceg.decrypt(encrypted[i]);
}
long endTimeDec = System.currentTimeMillis();
System.out.println((endTimeEnc - startTimeEnc) + "\t" + (endTimeDec - startTimeDec));
}
// DO NOT DELETE - Testing
private static void evalCurves() {
ECElGamal ecceg;
String res = "";
Enumeration<String> curveNames = NISTNamedCurves.getNames();
while (curveNames.hasMoreElements()) {
String curveName = (String) curveNames.nextElement();
ecceg = new ECElGamal(NISTNamedCurves.getByName(curveName));
ECCEGKeyGenerator keyGen = new ECCEGKeyGenerator(curveName);
KeyPair keypair = keyGen.generateKey();
ecceg.setPrivKey(keypair.getPrivKey());
ecceg.initReverseDLTable();
res += curveName + "\t";
System.out.print(curveName + "\t");
FragmentEncrypted encrypted = ecceg.encrypt(new BigInteger("25"));
FragmentEncoded encoded = encrypted.getFragmentEncoded();
res += encoded.sizeByte() + "\t";
System.out.print(encoded.sizeByte());
long duration = testRisk(ecceg);
res += duration + "\n";
}
System.out.println(res);
while (curveNames.hasMoreElements()) {
String curveName = (String) curveNames.nextElement();
System.out.println(curveName);
ECPointCompressionTest.advancedTest(100, curveName);
}
}
// DO NOT DELETE - Testing
private static long testRisk(ECElGamal eccegScheme) {
BigInteger[] SNPs = new BigInteger[COMBINATION_SIZE];
BigInteger[] coeffs = new BigInteger[COMBINATION_SIZE];
FragmentEncrypted[] fragsEncrypted = new FragmentEncrypted[COMBINATION_SIZE];
for (int i = 0; i < SNPs.length; i++) {
SNPs[i] = BigInteger.valueOf(i % 3);
coeffs[i] = BigInteger.valueOf((i + 2) % 3);
fragsEncrypted[i] = eccegScheme.encrypt(SNPs[i]);
}
FragmentEncrypted riskEncrypted;
BigInteger riskBigInteger;
double risk;
long startTime = System.currentTimeMillis();
for (int i = 0; i < NUMBER_TESTS; i++) {
riskEncrypted = RiskAnalyzer.risk(fragsEncrypted, coeffs);
riskBigInteger = eccegScheme.decrypt(riskEncrypted);
risk = riskBigInteger.doubleValue() / RiskAnalyzer.PRECISION;
}
long endTime = System.currentTimeMillis();
System.out.println("\t" + (endTime-startTime));
return (endTime - startTime);
}
}
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