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EvalEC.java
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Tue, Jan 7, 00:09

EvalEC.java
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package crypto.elgamal;
import java.math.BigInteger;
import java.util.Enumeration;
import org.bouncycastle.asn1.nist.NISTNamedCurves;
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();
ECElGamal ecceg = new ECElGamal(NISTNamedCurves.getByName("P-521"));
ecceg.initReverseDLTable();
for (int i = 0; i < 20; i++) {
timeDecrypt(ecceg);
}
}
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));
}
private static void evalCurves() {
ECElGamal ecceg;
Enumeration<String> curveNames = NISTNamedCurves.getNames();
while (curveNames.hasMoreElements()) {
String curveName = (String) curveNames.nextElement();
ecceg = new ECElGamal(NISTNamedCurves.getByName(curveName));
ecceg.initReverseDLTable();
System.out.print(curveName + "\t");
FragmentEncrypted encrypted = ecceg.encrypt(new BigInteger("25"));
FragmentEncoded encoded = encrypted.getFragmentEncoded();
System.out.print(encoded.sizeByte());
testRisk(ecceg);
}
}
private static void 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));
}
}

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