package org.bouncycastle.crypto.test;
import java.math.BigInteger;
import java.security.SecureRandom;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.generators.DSAKeyPairGenerator;
import org.bouncycastle.crypto.generators.DSAParametersGenerator;
import org.bouncycastle.crypto.params.DSAKeyGenerationParameters;
import org.bouncycastle.crypto.params.DSAParameters;
import org.bouncycastle.crypto.params.DSAValidationParameters;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.signers.DSASigner;
import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.util.test.SimpleTestResult;
import org.bouncycastle.util.test.Test;
import org.bouncycastle.util.test.TestResult;
/**
* Test based on FIPS 186-2, Appendix 5, an example of DSA.
*/
public class DSATest
implements Test
{
SecureRandom random = new SecureRandom()
{
boolean first = true;
public void nextBytes(byte[] bytes)
{
byte[] k1 = Hex.decode("d5014e4b60ef2ba8b6211b4062ba3224e0427dd3");
byte[] k2 = Hex.decode("345e8d05c075c3a508df729a1685690e68fcfb8c8117847e89063bca1f85d968fd281540b6e13bd1af989a1fbf17e06462bf511f9d0b140fb48ac1b1baa5bded");
if (first)
{
System.arraycopy(k1, 0, bytes, 0, k1.length);
first = false;
}
else
{
System.arraycopy(k2, 0, bytes, 0, k2.length);
}
}
};
SecureRandom keyRandom = new SecureRandom()
{
public void nextBytes(byte[] bytes)
{
byte[] k = Hex.decode("b5014e4b60ef2ba8b6211b4062ba3224e0427dd3");
int i;
for (i = 0; i < (bytes.length - k.length); i += k.length)
{
System.arraycopy(k, 0, bytes, i, k.length);
}
if (i > bytes.length)
{
System.arraycopy(k, 0, bytes, i - k.length, bytes.length - (i - k.length));
}
else
{
System.arraycopy(k, 0, bytes, i, bytes.length - i);
}
}
};
BigInteger pValue = new BigInteger("8df2a494492276aa3d25759bb06869cbeac0d83afb8d0cf7cbb8324f0d7882e5d0762fc5b7210eafc2e9adac32ab7aac49693dfbf83724c2ec0736ee31c80291", 16);
BigInteger qValue = new BigInteger("c773218c737ec8ee993b4f2ded30f48edace915f", 16);
public String getName()
{
return "DSA";
}
public TestResult perform()
{
BigInteger r = new BigInteger("68076202252361894315274692543577577550894681403");
BigInteger s = new BigInteger("1089214853334067536215539335472893651470583479365");
DSAParametersGenerator pGen = new DSAParametersGenerator();
pGen.init(512, 80, random);
DSAParameters params = pGen.generateParameters();
DSAValidationParameters pValid = params.getValidationParameters();
if (pValid.getCounter() != 105)
{
return new SimpleTestResult(false, getName() + ": Counter wrong");
}
if (!pValue.equals(params.getP()) || !qValue.equals(params.getQ()))
{
return new SimpleTestResult(false, getName() + ": p or q wrong");
}
DSAKeyPairGenerator dsaKeyGen = new DSAKeyPairGenerator();
DSAKeyGenerationParameters genParam = new DSAKeyGenerationParameters(keyRandom, params);
dsaKeyGen.init(genParam);
AsymmetricCipherKeyPair pair = dsaKeyGen.generateKeyPair();
ParametersWithRandom param = new ParametersWithRandom(pair.getPrivate(), keyRandom);
DSASigner dsa = new DSASigner();
dsa.init(true, param);
byte[] message = new BigInteger("968236873715988614170569073515315707566766479517").toByteArray();
BigInteger[] sig = dsa.generateSignature(message);
if (!r.equals(sig[0]))
{
return new SimpleTestResult(false, getName()
+ ": r component wrong." + System.getProperty("line.separator")
+ " expecting: " + r + System.getProperty("line.separator")
+ " got : " + sig[0]);
}
if (!s.equals(sig[1]))
{
return new SimpleTestResult(false, getName()
+ ": s component wrong." + System.getProperty("line.separator")
+ " expecting: " + s + System.getProperty("line.separator")
+ " got : " + sig[1]);
}
dsa.init(false, pair.getPublic());
if (dsa.verifySignature(message, sig[0], sig[1]))
{
return new SimpleTestResult(true, getName() + ": Okay");
}
else
{
return new SimpleTestResult(false, getName() + ": verification fails");
}
}
public static void main(
String[] args)
{
DSATest test = new DSATest();
TestResult result = test.perform();
System.out.println(result);
}
}