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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
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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.DHAgreement;
import org.bouncycastle.crypto.agreement.DHBasicAgreement;
import org.bouncycastle.crypto.generators.DHBasicKeyPairGenerator;
import org.bouncycastle.crypto.generators.DHKeyPairGenerator;
import org.bouncycastle.crypto.generators.DHParametersGenerator;
import org.bouncycastle.crypto.params.DHKeyGenerationParameters;
import org.bouncycastle.crypto.params.DHParameters;
import org.bouncycastle.crypto.params.DHPrivateKeyParameters;
import org.bouncycastle.crypto.params.DHPublicKeyParameters;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.util.test.SimpleTest;
public class DHTest
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 "DH";
}
private void testDH(
int size,
BigInteger g,
BigInteger p)
{
DHKeyPairGenerator kpGen = getDHKeyPairGenerator(g, p);
//
// generate first pair
//
AsymmetricCipherKeyPair pair = kpGen.generateKeyPair();
DHPublicKeyParameters pu1 = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters pv1 = (DHPrivateKeyParameters)pair.getPrivate();
//
// generate second pair
//
pair = kpGen.generateKeyPair();
DHPublicKeyParameters pu2 = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters pv2 = (DHPrivateKeyParameters)pair.getPrivate();
//
// two way
//
DHAgreement e1 = new DHAgreement();
DHAgreement e2 = new DHAgreement();
e1.init(pv1);
e2.init(pv2);
BigInteger m1 = e1.calculateMessage();
BigInteger m2 = e2.calculateMessage();
BigInteger k1 = e1.calculateAgreement(pu2, m2);
BigInteger k2 = e2.calculateAgreement(pu1, m1);
if (!k1.equals(k2))
{
fail(size + " bit 2-way test failed");
}
}
private void testDHBasic(
int size,
int privateValueSize,
BigInteger g,
BigInteger p)
{
DHBasicKeyPairGenerator kpGen = getDHBasicKeyPairGenerator(g, p, privateValueSize);
//
// generate first pair
//
AsymmetricCipherKeyPair pair = kpGen.generateKeyPair();
DHPublicKeyParameters pu1 = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters pv1 = (DHPrivateKeyParameters)pair.getPrivate();
checkKeySize(privateValueSize, pv1);
//
// generate second pair
//
pair = kpGen.generateKeyPair();
DHPublicKeyParameters pu2 = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters pv2 = (DHPrivateKeyParameters)pair.getPrivate();
checkKeySize(privateValueSize, pv2);
//
// two way
//
DHBasicAgreement e1 = new DHBasicAgreement();
DHBasicAgreement e2 = new DHBasicAgreement();
e1.init(pv1);
e2.init(pv2);
BigInteger k1 = e1.calculateAgreement(pu2);
BigInteger k2 = e2.calculateAgreement(pu1);
if (!k1.equals(k2))
{
fail("basic " + size + " bit 2-way test failed");
}
}
private void checkKeySize(
int privateValueSize,
DHPrivateKeyParameters priv)
{
if (privateValueSize != 0)
{
if (priv.getX().bitLength() != privateValueSize)
{
fail("limited key check failed for key size " + privateValueSize);
}
}
}
private void testGPWithRandom(
DHKeyPairGenerator kpGen)
{
//
// generate first pair
//
AsymmetricCipherKeyPair pair = kpGen.generateKeyPair();
DHPublicKeyParameters pu1 = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters pv1 = (DHPrivateKeyParameters)pair.getPrivate();
//
// generate second pair
//
pair = kpGen.generateKeyPair();
DHPublicKeyParameters pu2 = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters pv2 = (DHPrivateKeyParameters)pair.getPrivate();
//
// two way
//
DHAgreement e1 = new DHAgreement();
DHAgreement e2 = new DHAgreement();
e1.init(new ParametersWithRandom(pv1, new SecureRandom()));
e2.init(new ParametersWithRandom(pv2, new SecureRandom()));
BigInteger m1 = e1.calculateMessage();
BigInteger m2 = e2.calculateMessage();
BigInteger k1 = e1.calculateAgreement(pu2, m2);
BigInteger k2 = e2.calculateAgreement(pu1, m1);
if (!k1.equals(k2))
{
fail("basic with random 2-way test failed");
}
}
private void testSimpleWithRandom(
DHBasicKeyPairGenerator kpGen)
{
//
// generate first pair
//
AsymmetricCipherKeyPair pair = kpGen.generateKeyPair();
DHPublicKeyParameters pu1 = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters pv1 = (DHPrivateKeyParameters)pair.getPrivate();
//
// generate second pair
//
pair = kpGen.generateKeyPair();
DHPublicKeyParameters pu2 = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters pv2 = (DHPrivateKeyParameters)pair.getPrivate();
//
// two way
//
DHBasicAgreement e1 = new DHBasicAgreement();
DHBasicAgreement e2 = new DHBasicAgreement();
e1.init(new ParametersWithRandom(pv1, new SecureRandom()));
e2.init(new ParametersWithRandom(pv2, new SecureRandom()));
BigInteger k1 = e1.calculateAgreement(pu2);
BigInteger k2 = e2.calculateAgreement(pu1);
if (!k1.equals(k2))
{
fail("basic with random 2-way test failed");
}
}
private DHBasicKeyPairGenerator getDHBasicKeyPairGenerator(
BigInteger g,
BigInteger p,
int privateValueSize)
{
DHParameters dhParams = new DHParameters(p, g, null, privateValueSize);
DHKeyGenerationParameters params = new DHKeyGenerationParameters(new SecureRandom(), dhParams);
DHBasicKeyPairGenerator kpGen = new DHBasicKeyPairGenerator();
kpGen.init(params);
return kpGen;
}
private DHKeyPairGenerator getDHKeyPairGenerator(
BigInteger g,
BigInteger p)
{
DHParameters dhParams = new DHParameters(p, g);
DHKeyGenerationParameters params = new DHKeyGenerationParameters(new SecureRandom(), dhParams);
DHKeyPairGenerator kpGen = new DHKeyPairGenerator();
kpGen.init(params);
return kpGen;
}
/**
* this test is can take quiet a while
*/
private void testGeneration(
int size)
{
DHParametersGenerator pGen = new DHParametersGenerator();
pGen.init(size, 10, new SecureRandom());
DHParameters dhParams = pGen.generateParameters();
if (dhParams.getL() != 0)
{
fail("DHParametersGenerator failed to set J to 0 in generated DHParameters");
}
DHKeyGenerationParameters params = new DHKeyGenerationParameters(new SecureRandom(), dhParams);
DHBasicKeyPairGenerator kpGen = new DHBasicKeyPairGenerator();
kpGen.init(params);
//
// generate first pair
//
AsymmetricCipherKeyPair pair = kpGen.generateKeyPair();
DHPublicKeyParameters pu1 = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters pv1 = (DHPrivateKeyParameters)pair.getPrivate();
//
// generate second pair
//
params = new DHKeyGenerationParameters(new SecureRandom(), pu1.getParameters());
kpGen.init(params);
pair = kpGen.generateKeyPair();
DHPublicKeyParameters pu2 = (DHPublicKeyParameters)pair.getPublic();
DHPrivateKeyParameters pv2 = (DHPrivateKeyParameters)pair.getPrivate();
//
// two way
//
DHBasicAgreement e1 = new DHBasicAgreement();
DHBasicAgreement e2 = new DHBasicAgreement();
e1.init(new ParametersWithRandom(pv1, new SecureRandom()));
e2.init(new ParametersWithRandom(pv2, new SecureRandom()));
BigInteger k1 = e1.calculateAgreement(pu2);
BigInteger k2 = e2.calculateAgreement(pu1);
if (!k1.equals(k2))
{
fail("basic with " + size + " bit 2-way test failed");
}
}
private void testBounds()
{
BigInteger p1 = new BigInteger("00C8028E9151C6B51BCDB35C1F6B2527986A72D8546AE7A4BF41DC4289FF9837EE01592D36C324A0F066149B8B940C86C87D194206A39038AE3396F8E12435BB74449B70222D117B8A2BB77CB0D67A5D664DDE7B75E0FEC13CE0CAF258DAF3ADA0773F6FF0F2051D1859929AAA53B07809E496B582A89C3D7DA8B6E38305626621", 16);
BigInteger g1 = new BigInteger("1F869713181464577FE4026B47102FA0D7675503A4FCDA810881FAEC3524E6DBAEA9B96561EF7F8BEA76466DF11C2F3EB1A90CC5851735BF860606481257EECE6418C0204E61004E85D7131CE54BCBC7AD67E53C79DCB715E7C8D083DCD85D728283EC8F96839B4C9FA7C0727C472BEB94E4613CAFA8D580119C0AF4BF8AF252", 16);
int l1 = 1023;
BigInteger p2 = new BigInteger("00B333C98720220CC3946F494E25231B3E19F9AD5F6B19F4E7ABF80D8826C491C3224D4F7415A14A7C11D1BE584405FED12C3554F103E56A72D986CA5E325BB9DE07AC37D1EAE5E5AC724D32EF638F0E4462D4C1FC7A45B9FD3A5DF5EC36A1FA4DAA3FBB66AA42B1B71DF416AB547E987513426C7BB8634F5F4D37705514FDC1E1", 16);
BigInteger g2 = new BigInteger("2592F5A99FE46313650CCE66C94C15DBED9F4A45BD05C329986CF5D3E12139F0405A47C6385FEA27BFFEDC4CBABC5BB151F3BEE7CC3D51567F1E2B12A975AA9F48A70BDAAE7F5B87E70ADCF902490A3CBEFEDA41EBA8E12E02B56120B5FDEFBED07F5EAD3AE020DF3C8233216F8F0D35E13A7AE4DA5CBCC0D91EADBF20C281C6", 16);
int l2 = 1024;
DHKeyGenerationParameters params1 = new DHKeyGenerationParameters(new SecureRandom(), new DHParameters(p1, g1, null, l1));
DHKeyGenerationParameters params2 = new DHKeyGenerationParameters(new SecureRandom(), new DHParameters(p2, g2, null, l2));
DHBasicKeyPairGenerator kpGen = new DHBasicKeyPairGenerator();
kpGen.init(params1);
kpGen.init(params2);
}
public void performTest()
{
testDHBasic(512, 0, g512, p512);
testDHBasic(768, 0, g768, p768);
testDHBasic(1024, 0, g1024, p1024);
testDHBasic(512, 64, g512, p512);
testDHBasic(768, 128, g768, p768);
testDHBasic(1024, 256, g1024, p1024);
testDH(512, g512, p512);
testDH(768, g768, p768);
testDH(1024, g1024, p1024);
testBounds();
//
// generation test.
//
testGeneration(256);
//
// with random test
//
DHBasicKeyPairGenerator kpBasicGen = getDHBasicKeyPairGenerator(g512, p512, 0);
testSimpleWithRandom(kpBasicGen);
DHKeyPairGenerator kpGen = getDHKeyPairGenerator(g512, p512);
testGPWithRandom(kpGen);
//
// parameter tests
//
DHAgreement dh = new DHAgreement();
AsymmetricCipherKeyPair dhPair = kpGen.generateKeyPair();
try
{
dh.init(dhPair.getPublic());
fail("DHAgreement key check failed");
}
catch (IllegalArgumentException e)
{
// ignore
}
DHKeyPairGenerator kpGen768 = getDHKeyPairGenerator(g768, p768);
try
{
dh.init(dhPair.getPrivate());
dh.calculateAgreement((DHPublicKeyParameters)kpGen768.generateKeyPair().getPublic(), BigInteger.valueOf(100));
fail("DHAgreement agreement check failed");
}
catch (IllegalArgumentException e)
{
// ignore
}
DHBasicAgreement dhBasic = new DHBasicAgreement();
AsymmetricCipherKeyPair dhBasicPair = kpBasicGen.generateKeyPair();
try
{
dhBasic.init(dhBasicPair.getPublic());
fail("DHBasicAgreement key check failed");
}
catch (IllegalArgumentException e)
{
// expected
}
DHBasicKeyPairGenerator kpBasicGen768 = getDHBasicKeyPairGenerator(g768, p768, 0);
try
{
dhBasic.init(dhPair.getPrivate());
dhBasic.calculateAgreement((DHPublicKeyParameters)kpBasicGen768.generateKeyPair().getPublic());
fail("DHBasicAgreement agreement check failed");
}
catch (IllegalArgumentException e)
{
// expected
}
}
public static void main(
String[] args)
{
runTest(new DHTest());
}
}