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import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.security.SignatureException;
import java.security.cert.X509Certificate;
import java.util.Date;
import javax.security.auth.x500.X500Principal;
import org.bouncycastle.x509.X509V1CertificateGenerator;
public class MainClass {
public static X509Certificate generateV1Certificate(KeyPair pair) throws InvalidKeyException,
NoSuchProviderException, SignatureException {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();
certGen.setSerialNumber(BigInteger.valueOf(System.currentTimeMillis()));
certGen.setIssuerDN(new X500Principal("CN=Test Certificate"));
certGen.setNotBefore(new Date(System.currentTimeMillis() - 10000));
certGen.setNotAfter(new Date(System.currentTimeMillis() + 10000));
certGen.setSubjectDN(new X500Principal("CN=Test Certificate"));
certGen.setPublicKey(pair.getPublic());
certGen.setSignatureAlgorithm("SHA256WithRSAEncryption");
return certGen.generateX509Certificate(pair.getPrivate(), "BC");
}
public static void main(String[] args) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
KeyPair pair = generateRSAKeyPair();
X509Certificate cert = generateV1Certificate(pair);
cert.checkValidity(new Date());
cert.verify(cert.getPublicKey());
}
public static KeyPair generateRSAKeyPair() throws Exception {
KeyPairGenerator kpGen = KeyPairGenerator.getInstance("RSA", "BC");
kpGen.initialize(1024, new SecureRandom());
return kpGen.generateKeyPair();
}
}
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