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package org.bouncycastle.math.ec.test;
import java.math.BigInteger;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import junit.framework.TestCase;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x9.ECNamedCurveTable;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.ec.CustomNamedCurves;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.util.Times;
/**
* Compares the performance of the the window NAF point multiplication against conventional point
* multiplication.
*/
public class ECPointPerformanceTest extends TestCase
{
static final int MILLIS_PER_ROUND = 200;
static final int MILLIS_WARMUP = 1000;
static final int MULTS_PER_CHECK = 16;
static final int NUM_ROUNDS = 10;
private static String[] COORD_NAMES = new String[]{ "AFFINE", "HOMOGENEOUS", "JACOBIAN", "JACOBIAN-CHUDNOVSKY",
"JACOBIAN-MODIFIED", "LAMBDA-AFFINE", "LAMBDA-PROJECTIVE", "SKEWED" };
private void randMult(String curveName) throws Exception
{
X9ECParameters spec = ECNamedCurveTable.getByName(curveName);
if (spec != null)
{
randMult(curveName, spec);
}
spec = CustomNamedCurves.getByName(curveName);
if (spec != null)
{
randMult(curveName + " (custom)", spec);
}
}
private void randMult(String label, X9ECParameters spec) throws Exception
{
ECCurve C = spec.getCurve();
ECPoint G = (ECPoint)spec.getG();
BigInteger n = spec.getN();
SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");
random.setSeed(System.currentTimeMillis());
System.out.println(label);
int[] coords = ECCurve.getAllCoordinateSystems();
for (int i = 0; i < coords.length; ++i)
{
int coord = coords[i];
if (C.supportsCoordinateSystem(coord))
{
ECCurve c = C;
ECPoint g = G;
if (c.getCoordinateSystem() != coord)
{
c = C.configure().setCoordinateSystem(coord).create();
g = c.importPoint(G);
}
double avgRate = randMult(random, g, n);
String coordName = COORD_NAMES[coord];
StringBuffer sb = new StringBuffer();
sb.append(" ");
sb.append(coordName);
for (int j = sb.length(); j < 28; ++j)
{
sb.append(' ');
}
sb.append(": ");
sb.append(avgRate);
sb.append(" mults/sec");
for (int j = sb.length(); j < 64; ++j)
{
sb.append(' ');
}
sb.append('(');
sb.append(1000.0 / avgRate);
sb.append(" millis/mult)");
System.out.println(sb.toString());
}
}
}
private double randMult(SecureRandom random, ECPoint g, BigInteger n) throws Exception
{
BigInteger[] ks = new BigInteger[128];
for (int i = 0; i < ks.length; ++i)
{
ks[i] = new BigInteger(n.bitLength() - 1, random);
}
int ki = 0;
ECPoint p = g;
{
long startTime = Times.nanoTime();
long goalTime = startTime + 1000000L * MILLIS_WARMUP;
do
{
BigInteger k = ks[ki];
p = g.multiply(k);
if ((ki & 1) != 0)
{
g = p;
}
if (++ki == ks.length)
{
ki = 0;
}
}
while (Times.nanoTime() < goalTime);
}
double minRate = Double.MAX_VALUE, maxRate = Double.MIN_VALUE, totalRate = 0.0;
for (int i = 1; i <= NUM_ROUNDS; i++)
{
long startTime = Times.nanoTime();
long goalTime = startTime + 1000000L * MILLIS_PER_ROUND;
long count = 0, endTime;
do
{
++count;
for (int j = 0; j < MULTS_PER_CHECK; ++j)
{
BigInteger k = ks[ki];
p = g.multiply(k);
if ((ki & 1) != 0)
{
g = p;
}
if (++ki == ks.length)
{
ki = 0;
}
}
endTime = Times.nanoTime();
}
while (endTime < goalTime);
double roundElapsed = (double)(endTime - startTime);
double roundRate = count * MULTS_PER_CHECK * 1000000000L / roundElapsed;
minRate = Math.min(minRate, roundRate);
maxRate = Math.max(maxRate, roundRate);
totalRate += roundRate;
}
return (totalRate - minRate - maxRate) / (NUM_ROUNDS - 2);
}
public void testMultiply() throws Exception
{
SortedSet names = new TreeSet(enumToList(ECNamedCurveTable.getNames()));
names.addAll(enumToList(CustomNamedCurves.getNames()));
Set oids = new HashSet();
Iterator it = names.iterator();
while (it.hasNext())
{
String name = (String)it.next();
ASN1ObjectIdentifier oid = ECNamedCurveTable.getOID(name);
if (oid == null)
{
oid = CustomNamedCurves.getOID(name);
}
if (oid != null && !oids.add(oid))
{
continue;
}
randMult(name);
}
}
private List enumToList(Enumeration en)
{
List rv = new ArrayList();
while (en.hasMoreElements())
{
rv.add(en.nextElement());
}
return rv;
}
}
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