io.aos.crypto.spl07.Utils.java Source code

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Here is the source code for io.aos.crypto.spl07.Utils.java

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package io.aos.crypto.spl07;

import java.math.BigInteger;
import java.security.*;
import java.security.cert.X509Certificate;
import java.util.Date;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.x509.*;
import org.bouncycastle.x509.*;
import org.bouncycastle.x509.extension.*;

/**
 * Chapter 7 Utils
 */
public class Utils extends io.aos.crypto.spl06.Utils {
    private static final int VALIDITY_PERIOD = 7 * 24 * 60 * 60 * 1000; // one week

    /**
     * Generate a sample V1 certificate to use as a CA root certificate
     */
    public static X509Certificate generateRootCert(KeyPair pair) throws Exception {
        X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();

        certGen.setSerialNumber(BigInteger.valueOf(1));
        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(), "BC");
    }

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

        certGen.setSerialNumber(BigInteger.valueOf(1));
        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, "BC");
    }

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

        certGen.setSerialNumber(BigInteger.valueOf(1));
        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, "BC");
    }
}