package org.bouncycastle.jce.provider.test;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.util.test.SimpleTest;
import javax.crypto.Cipher;
import javax.crypto.interfaces.DHPrivateKey;
import javax.crypto.interfaces.DHPublicKey;
import javax.crypto.spec.DHParameterSpec;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.security.AlgorithmParameterGenerator;
import java.security.AlgorithmParameters;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.Security;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class ElGamalTest
extends SimpleTest
{
private BigInteger g512 = new BigInteger("153d5d6172adb43045b68ae8e1de1070b6137005686d29d3d73a7749199681ee5b212c9b96bfdcfa5b20cd5e3fd2044895d609cf9b410b7a0f12ca1cb9a428cc", 16);
private BigInteger p512 = new BigInteger("9494fec095f3b85ee286542b3836fc81a5dd0a0349b4c239dd38744d488cf8e31db8bcb7d33b41abb9e5a33cca9144b1cef332c94bf0573bf047a3aca98cdf3b", 16);
private BigInteger g768 = new BigInteger("7c240073c1316c621df461b71ebb0cdcc90a6e5527e5e126633d131f87461c4dc4afc60c2cb0f053b6758871489a69613e2a8b4c8acde23954c08c81cbd36132cfd64d69e4ed9f8e51ed6e516297206672d5c0a69135df0a5dcf010d289a9ca1", 16);
private BigInteger p768 = new BigInteger("8c9dd223debed1b80103b8b309715be009d48860ed5ae9b9d5d8159508efd802e3ad4501a7f7e1cfec78844489148cd72da24b21eddd01aa624291c48393e277cfc529e37075eccef957f3616f962d15b44aeab4039d01b817fde9eaa12fd73f", 16);
private BigInteger g1024 = new BigInteger("1db17639cdf96bc4eabba19454f0b7e5bd4e14862889a725c96eb61048dcd676ceb303d586e30f060dbafd8a571a39c4d823982117da5cc4e0f89c77388b7a08896362429b94a18a327604eb7ff227bffbc83459ade299e57b5f77b50fb045250934938efa145511166e3197373e1b5b1e52de713eb49792bedde722c6717abf", 16);
private BigInteger p1024 = new BigInteger("a00e283b3c624e5b2b4d9fbc2653b5185d99499b00fd1bf244c6f0bb817b4d1c451b2958d62a0f8a38caef059fb5ecd25d75ed9af403f5b5bdab97a642902f824e3c13789fed95fa106ddfe0ff4a707c85e2eb77d49e68f2808bcea18ce128b178cd287c6bc00efa9a1ad2a673fe0dceace53166f75b81d6709d5f8af7c66bb7", 16);
public String getName()
{
return "ElGamal";
}
private void testGP(
int size,
int privateValueSize,
BigInteger g,
BigInteger p)
throws Exception
{
DHParameterSpec elParams = new DHParameterSpec(p, g, privateValueSize);
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ElGamal", "BC");
byte[] in = "This is a test".getBytes();
keyGen.initialize(elParams);
KeyPair keyPair = keyGen.generateKeyPair();
SecureRandom rand = new SecureRandom();
checkKeySize(privateValueSize, keyPair);
Cipher cipher = Cipher.getInstance("ElGamal", "BC");
cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
if (cipher.getOutputSize(in.length) != (size / 8) * 2)
{
fail("getOutputSize wrong on encryption");
}
byte[] out = cipher.doFinal(in);
cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
if (cipher.getOutputSize(out.length) != (size / 8) - 1)
{
fail("getOutputSize wrong on decryption");
}
//
// No Padding - maximum length
//
byte[] modBytes = ((DHPublicKey)keyPair.getPublic()).getParams().getP().toByteArray();
byte[] maxInput = new byte[modBytes.length - 1];
maxInput[0] |= 0x7f;
cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
out = cipher.doFinal(maxInput);
cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
out = cipher.doFinal(out);
if (!areEqual(out, maxInput))
{
fail("NoPadding test failed on decrypt expected " + new String(Hex.encode(maxInput)) + " got " + new String(Hex.encode(out)));
}
//
// encrypt/decrypt
//
Cipher c1 = Cipher.getInstance("ElGamal", "BC");
Cipher c2 = Cipher.getInstance("ElGamal", "BC");
c1.init(Cipher.ENCRYPT_MODE, keyPair.getPublic(), rand);
byte[] out1 = c1.doFinal(in);
c2.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
byte[] out2 = c2.doFinal(out1);
if (!areEqual(in, out2))
{
fail(size + " encrypt test failed");
}
//
// encrypt/decrypt with update
//
int outLen = c1.update(in, 0, 2, out1, 0);
outLen += c1.doFinal(in, 2, in.length - 2, out1, outLen);
outLen = c2.update(out1, 0, 2, out2, 0);
outLen += c2.doFinal(out1, 2, out1.length - 2, out2, outLen);
if (!areEqual(in, out2))
{
fail(size + " encrypt with update test failed");
}
//
// public key encoding test
//
byte[] pubEnc = keyPair.getPublic().getEncoded();
KeyFactory keyFac = KeyFactory.getInstance("ElGamal", "BC");
X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(pubEnc);
DHPublicKey pubKey = (DHPublicKey)keyFac.generatePublic(pubX509);
DHParameterSpec spec = pubKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP()))
{
fail(size + " bit public key encoding/decoding test failed on parameters");
}
if (!((DHPublicKey)keyPair.getPublic()).getY().equals(pubKey.getY()))
{
fail(size + " bit public key encoding/decoding test failed on y value");
}
//
// public key serialisation test
//
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
ObjectOutputStream oOut = new ObjectOutputStream(bOut);
oOut.writeObject(keyPair.getPublic());
ByteArrayInputStream bIn = new ByteArrayInputStream(bOut.toByteArray());
ObjectInputStream oIn = new ObjectInputStream(bIn);
pubKey = (DHPublicKey)oIn.readObject();
spec = pubKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP()))
{
fail(size + " bit public key serialisation test failed on parameters");
}
if (!((DHPublicKey)keyPair.getPublic()).getY().equals(pubKey.getY()))
{
fail(size + " bit public key serialisation test failed on y value");
}
//
// private key encoding test
//
byte[] privEnc = keyPair.getPrivate().getEncoded();
PKCS8EncodedKeySpec privPKCS8 = new PKCS8EncodedKeySpec(privEnc);
DHPrivateKey privKey = (DHPrivateKey)keyFac.generatePrivate(privPKCS8);
spec = privKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP()))
{
fail(size + " bit private key encoding/decoding test failed on parameters");
}
if (!((DHPrivateKey)keyPair.getPrivate()).getX().equals(privKey.getX()))
{
fail(size + " bit private key encoding/decoding test failed on y value");
}
//
// private key serialisation test
//
bOut = new ByteArrayOutputStream();
oOut = new ObjectOutputStream(bOut);
oOut.writeObject(keyPair.getPrivate());
bIn = new ByteArrayInputStream(bOut.toByteArray());
oIn = new ObjectInputStream(bIn);
privKey = (DHPrivateKey)oIn.readObject();
spec = privKey.getParams();
if (!spec.getG().equals(elParams.getG()) || !spec.getP().equals(elParams.getP()))
{
fail(size + " bit private key serialisation test failed on parameters");
}
if (!((DHPrivateKey)keyPair.getPrivate()).getX().equals(privKey.getX()))
{
fail(size + " bit private key serialisation test failed on y value");
}
}
private void checkKeySize(int privateValueSize, KeyPair aKeyPair)
{
if (privateValueSize != 0)
{
DHPrivateKey key = (DHPrivateKey)aKeyPair.getPrivate();
if (key.getX().bitLength() != privateValueSize)
{
fail("limited key check failed for key size " + privateValueSize);
}
}
}
private void testRandom(
int size)
throws Exception
{
AlgorithmParameterGenerator a = AlgorithmParameterGenerator.getInstance("ElGamal", "BC");
a.init(size, new SecureRandom());
AlgorithmParameters params = a.generateParameters();
byte[] encodeParams = params.getEncoded();
AlgorithmParameters a2 = AlgorithmParameters.getInstance("ElGamal", "BC");
a2.init(encodeParams);
// a and a2 should be equivalent!
byte[] encodeParams_2 = a2.getEncoded();
if (!areEqual(encodeParams, encodeParams_2))
{
fail(this.getName() + ": encode/decode parameters failed");
}
DHParameterSpec elP = (DHParameterSpec)params.getParameterSpec(DHParameterSpec.class);
testGP(size, 0, elP.getG(), elP.getP());
}
public void performTest()
throws Exception
{
testGP(512, 0, g512, p512);
testGP(768, 0, g768, p768);
testGP(1024, 0, g1024, p1024);
testGP(512, 64, g512, p512);
testGP(768, 128, g768, p768);
testGP(1024, 256, g1024, p1024);
testRandom(256);
}
public static void main(
String[] args)
{
Security.addProvider(new BouncyCastleProvider());
runTest(new ElGamalTest());
}
}