org.bouncycastle.crypto.tls.CertificateRequest Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcprov-jdk14 Show documentation

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 1.4.

There is a newer version: 1.79

Show newest version

package org.bouncycastle.crypto.tls;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Vector;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.x500.X500Name;

/**
 * Parsing and encoding of a CertificateRequest struct from RFC 4346.
 * 
 * 
 * struct {
 *     ClientCertificateType certificate_types<1..2^8-1>;
 *     DistinguishedName certificate_authorities<3..2^16-1>;
 * } CertificateRequest;
 * 
 *
 * @see ClientCertificateType
 * @see X500Name
 */
public class CertificateRequest
{
    private short[] certificateTypes;
    private Vector certificateAuthorities;

    /*
     * TODO RFC 5264 7.4.4 A list of the hash/signature algorithm pairs that the server is able to
     * verify, listed in descending order of preference.
     */

    /**
     * @param certificateTypes       see {@link ClientCertificateType} for valid constants.
     * @param certificateAuthorities a {@link Vector} of {@link X500Name}.
     */
    public CertificateRequest(short[] certificateTypes, Vector certificateAuthorities)
    {
        this.certificateTypes = certificateTypes;
        this.certificateAuthorities = certificateAuthorities;
    }

    /**
     * @return an array of certificate types
     * @see {@link ClientCertificateType}
     */
    public short[] getCertificateTypes()
    {
        return certificateTypes;
    }

    /**
     * @return a {@link Vector} of {@link X500Name}
     */
    public Vector getCertificateAuthorities()
    {
        return certificateAuthorities;
    }

    /**
     * Encode this {@link CertificateRequest} to an {@link OutputStream}.
     *
     * @param output the {@link OutputStream} to encode to.
     * @throws IOException
     */
    public void encode(OutputStream output)
        throws IOException
    {

        if (certificateTypes == null || certificateTypes.length == 0)
        {
            TlsUtils.writeUint8((short)0, output);
        }
        else
        {
            TlsUtils.writeUint8((short)certificateTypes.length, output);
            TlsUtils.writeUint8Array(certificateTypes, output);
        }

        if (certificateAuthorities == null || certificateAuthorities.isEmpty())
        {
            TlsUtils.writeUint16(0, output);
        }
        else
        {

            Vector encDNs = new Vector(certificateAuthorities.size());
            int totalLength = 0;
            for (int i = 0; i < certificateAuthorities.size(); ++i)
            {
                X500Name authorityDN = (X500Name)certificateAuthorities.elementAt(i);
                byte[] encDN = authorityDN.getEncoded(ASN1Encoding.DER);
                encDNs.addElement(encDN);
                totalLength += encDN.length;
            }

            TlsUtils.writeUint16(totalLength, output);

            for (int i = 0; i < encDNs.size(); ++i)
            {
                byte[] encDN = (byte[])encDNs.elementAt(i);
                output.write(encDN);
            }
        }
    }

    /**
     * Parse a {@link CertificateRequest} from an {@link InputStream}.
     *
     * @param input the {@link InputStream} to parse from.
     * @return a {@link CertificateRequest} object.
     * @throws IOException
     */
    public static CertificateRequest parse(InputStream input)
        throws IOException
    {
        int numTypes = TlsUtils.readUint8(input);
        short[] certificateTypes = new short[numTypes];
        for (int i = 0; i < numTypes; ++i)
        {
            certificateTypes[i] = TlsUtils.readUint8(input);
        }

        byte[] authorities = TlsUtils.readOpaque16(input);

        Vector authorityDNs = new Vector();

        ByteArrayInputStream bis = new ByteArrayInputStream(authorities);
        while (bis.available() > 0)
        {
            byte[] dnBytes = TlsUtils.readOpaque16(bis);
            authorityDNs.addElement(X500Name.getInstance(ASN1Primitive.fromByteArray(dnBytes)));
        }

        return new CertificateRequest(certificateTypes, authorityDNs);
    }
}