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package org.bouncycastle.crypto.test;
import java.math.BigInteger;
import java.security.SecureRandom;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.agreement.DHStandardGroups;
import org.bouncycastle.crypto.engines.CramerShoupCiphertext;
import org.bouncycastle.crypto.engines.CramerShoupCoreEngine;
import org.bouncycastle.crypto.engines.CramerShoupCoreEngine.CramerShoupCiphertextException;
import org.bouncycastle.crypto.generators.CramerShoupKeyPairGenerator;
import org.bouncycastle.crypto.generators.CramerShoupParametersGenerator;
import org.bouncycastle.crypto.params.CramerShoupKeyGenerationParameters;
import org.bouncycastle.crypto.params.CramerShoupParameters;
import org.bouncycastle.util.BigIntegers;
import org.bouncycastle.util.test.SimpleTest;
public class CramerShoupTest
extends SimpleTest
{
private static final BigInteger ONE = BigInteger.valueOf(1);
private static final SecureRandom RND = new SecureRandom();
private AsymmetricCipherKeyPair keyPair;
public static void main(String[] args)
{
runTest(new CramerShoupTest());
}
public String getName()
{
return "CramerShoup";
}
public void performTest()
throws Exception
{
BigInteger pSubOne = DHStandardGroups.rfc3526_2048.getP().subtract(ONE);
for (int i = 0; i < 10; ++i)
{
BigInteger message = BigIntegers.createRandomInRange(ONE, pSubOne, RND);
BigInteger m1 = encDecTest(message);
BigInteger m2 = labelledEncDecTest(message, "myRandomLabel");
BigInteger m3 = encDecEncodingTest(message);
BigInteger m4 = labelledEncDecEncodingTest(message, "myOtherCoolLabel");
if (!message.equals(m1) || !message.equals(m2) || !message.equals(m3) || !message.equals(m4))
{
fail("decrypted message != original message");
}
}
}
private BigInteger encDecEncodingTest(BigInteger m)
{
CramerShoupCiphertext ciphertext = encrypt(m);
byte[] c = ciphertext.toByteArray();
CramerShoupCiphertext decC = new CramerShoupCiphertext(c);
return decrypt(decC);
}
private BigInteger labelledEncDecEncodingTest(BigInteger m, String l)
{
byte[] c = encrypt(m, l).toByteArray();
return decrypt(new CramerShoupCiphertext(c), l);
}
private BigInteger encDecTest(BigInteger m)
{
CramerShoupCiphertext c = encrypt(m);
return decrypt(c);
}
private BigInteger labelledEncDecTest(BigInteger m, String l)
{
CramerShoupCiphertext c = encrypt(m, l);
return decrypt(c, l);
}
private BigInteger decrypt(CramerShoupCiphertext ciphertext)
{
return decrypt(ciphertext, null);
}
private BigInteger decrypt(CramerShoupCiphertext ciphertext, String label)
{
CramerShoupCoreEngine engine = new CramerShoupCoreEngine();
if (label != null)
{
engine.init(false, keyPair.getPrivate(), label);
}
else
{
engine.init(false, keyPair.getPrivate());
}
try
{
BigInteger m = engine.decryptBlock(ciphertext);
return m;
}
catch (CramerShoupCiphertextException e)
{
e.printStackTrace();
}
return null;
}
private CramerShoupCiphertext encrypt(BigInteger message)
{
return encrypt(message, null);
}
private CramerShoupCiphertext encrypt(BigInteger message, String label)
{
CramerShoupKeyPairGenerator kpGen = new CramerShoupKeyPairGenerator();
CramerShoupParametersGenerator pGen = new CramerShoupParametersGenerator();
pGen.init(2048, 1, RND);
CramerShoupParameters params = pGen.generateParameters(DHStandardGroups.rfc3526_2048);
CramerShoupKeyGenerationParameters param = new CramerShoupKeyGenerationParameters(RND, params);
kpGen.init(param);
keyPair = kpGen.generateKeyPair();
CramerShoupCoreEngine engine = new CramerShoupCoreEngine();
if (label != null)
{
engine.init(true, keyPair.getPublic(), label);
}
else
{
engine.init(true, keyPair.getPublic());
}
CramerShoupCiphertext ciphertext = engine.encryptBlock(message);
return ciphertext;
}
}
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