chapter7.Utils.java Source code

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Here is the source code for chapter7.Utils.java

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package chapter7;

import java.math.BigInteger;
import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.X509Certificate;
import java.util.Date;
import javax.security.auth.x500.X500Principal;
import org.bouncycastle.asn1.x509.BasicConstraints;
import org.bouncycastle.asn1.x509.KeyUsage;
import org.bouncycastle.asn1.x509.X509Extensions;
import org.bouncycastle.x509.X509V1CertificateGenerator;
import org.bouncycastle.x509.X509V3CertificateGenerator;
import org.bouncycastle.x509.extension.AuthorityKeyIdentifierStructure;
import org.bouncycastle.x509.extension.SubjectKeyIdentifierStructure;
import utils.CryptoDefs;

/**
 *
 * @author fran
 */
public class Utils extends chapter6.Utils implements java.io.Serializable {
    private static final long serialVersionUID = -1L;
    private static final String _NAME = Utils.class.getName();

    private static final int VALIDITY_PERIOD = 7 * 24 * 60 * 60 * 1000; // One week

    /*------------------------------------------------------------------------*/
    /*                          Metodos Privados                              */
    /*------------------------------------------------------------------------*/

    /*------------------------------------------------------------------------*/
    /*                          Default Access                                */
    /*------------------------------------------------------------------------*/

    /*------------------------------------------------------------------------*/
    /*                          Metodos Protegidos                            */
    /*------------------------------------------------------------------------*/

    /*------------------------------------------------------------------------*/
    /*                            Constructores                               */
    /*------------------------------------------------------------------------*/
    /**
     * Constructor por defecto.
     */
    public Utils() {
    }

    /*------------------------------------------------------------------------*/
    /*                          Metodos Publicos                              */
    /*------------------------------------------------------------------------*/
    /**
     * Generate a sample V1 certificate to use as a CA root certificate.
     * @param pair
     * @return
     * @throws Exception
     */
    public static X509Certificate generateRootCert(final KeyPair pair) throws Exception {
        X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();

        certGen.setSerialNumber(BigInteger.ONE);
        certGen.setIssuerDN(new X500Principal("CN=Test CA Certificate"));
        certGen.setNotBefore(new Date(System.currentTimeMillis()));
        certGen.setNotAfter(new Date(System.currentTimeMillis() + VALIDITY_PERIOD));
        certGen.setSubjectDN(new X500Principal("CN=Test CA Certificate"));
        certGen.setPublicKey(pair.getPublic());
        certGen.setSignatureAlgorithm("SHA1WithRSAEncryption");

        return certGen.generateX509Certificate(pair.getPrivate(), CryptoDefs.Provider.BC.getName());
    }

    /**
     * Generate a sample V3 certificate to use as an intermediate CA certificate.
     * @param intKey
     * @param caKey
     * @param caCert
     * @return
     * @throws Exception
     */
    public static X509Certificate generateIntermediateCert(final PublicKey intKey, final PrivateKey caKey,
            final X509Certificate caCert) throws Exception {
        X509V3CertificateGenerator certGen = new X509V3CertificateGenerator();

        certGen.setSerialNumber(BigInteger.ONE);
        certGen.setIssuerDN(caCert.getSubjectX500Principal());
        certGen.setNotBefore(new Date(System.currentTimeMillis()));
        certGen.setNotAfter(new Date(System.currentTimeMillis() + VALIDITY_PERIOD));
        certGen.setSubjectDN(new X500Principal("CN=Test Intermediate Certificate"));
        certGen.setPublicKey(intKey);
        certGen.setSignatureAlgorithm("SHA1WithRSAEncryption");

        certGen.addExtension(X509Extensions.AuthorityKeyIdentifier, false,
                new AuthorityKeyIdentifierStructure(caCert));
        certGen.addExtension(X509Extensions.SubjectKeyIdentifier, false, new SubjectKeyIdentifierStructure(intKey));
        certGen.addExtension(X509Extensions.BasicConstraints, true, new BasicConstraints(0));
        certGen.addExtension(X509Extensions.KeyUsage, true,
                new KeyUsage(KeyUsage.digitalSignature | KeyUsage.keyCertSign | KeyUsage.cRLSign));

        return certGen.generateX509Certificate(caKey, CryptoDefs.Provider.BC.getName());
    }

    /**
     * Generate a sample V3 certificate to use as an end entity certificate.
     * @param entityKey
     * @param caKey
     * @param caCert
     * @return
     * @throws Exception
     */
    public static X509Certificate generateEndEntityCert(final PublicKey entityKey, final PrivateKey caKey,
            final X509Certificate caCert) throws Exception {
        X509V3CertificateGenerator certGen = new X509V3CertificateGenerator();

        certGen.setSerialNumber(BigInteger.ONE);
        certGen.setIssuerDN(caCert.getSubjectX500Principal());
        certGen.setNotBefore(new Date(System.currentTimeMillis()));
        certGen.setNotAfter(new Date(System.currentTimeMillis() + VALIDITY_PERIOD));
        certGen.setSubjectDN(new X500Principal("CN=Test End Certificate"));
        certGen.setPublicKey(entityKey);
        certGen.setSignatureAlgorithm("SHA1WithRSAEncryption");

        certGen.addExtension(X509Extensions.AuthorityKeyIdentifier, false,
                new AuthorityKeyIdentifierStructure(caCert));
        certGen.addExtension(X509Extensions.SubjectKeyIdentifier, false,
                new SubjectKeyIdentifierStructure(entityKey));
        certGen.addExtension(X509Extensions.BasicConstraints, true, new BasicConstraints(false));
        certGen.addExtension(X509Extensions.KeyUsage, true,
                new KeyUsage(KeyUsage.digitalSignature | KeyUsage.keyEncipherment));

        return certGen.generateX509Certificate(caKey, CryptoDefs.Provider.BC.getName());
    }
}