be.fedict.trust.constraints.KeyUsageCertificateConstraint.java Source code

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Here is the source code for be.fedict.trust.constraints.KeyUsageCertificateConstraint.java

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/*
 * Java Trust Project.
 * Copyright (C) 2009 FedICT.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version
 * 3.0 as published by the Free Software Foundation.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, see 
 * http://www.gnu.org/licenses/.
 */

package be.fedict.trust.constraints;

import java.security.cert.X509Certificate;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import be.fedict.trust.CertificateConstraint;

/**
 * Key Usage Certificate Constraint implementation.
 * 
 * @author Frank Cornelis
 * 
 */
public class KeyUsageCertificateConstraint implements CertificateConstraint {

    private static final Log LOG = LogFactory.getLog(KeyUsageCertificateConstraint.class);

    private static final int DIGITAL_SIGNATURE_IDX = 0;
    private static final int NON_REPUDIATION_IDX = 1;
    private static final int KEY_ENCIPHERMENT_IDX = 2;
    private static final int DATA_ENCIPHERMENT_IDX = 3;
    private static final int KEY_AGREEMENT_IDX = 4;
    private static final int KEY_CERT_SIGN_IDX = 5;
    private static final int CRL_SIGN_IDX = 6;
    private static final int ENCIPHER_ONLY_IDX = 7;
    private static final int DECIPHER_ONLY_IDX = 8;

    private final Boolean[] mask;

    /**
     * Default constructor.
     */
    public KeyUsageCertificateConstraint() {
        this.mask = new Boolean[9];
    }

    public void setDigitalSignatureFilter(Boolean flag) {
        this.mask[DIGITAL_SIGNATURE_IDX] = flag;
    }

    public void setNonRepudiationFilter(Boolean flag) {
        this.mask[NON_REPUDIATION_IDX] = flag;
    }

    public void setKeyEnciphermentFilter(Boolean flag) {
        this.mask[KEY_ENCIPHERMENT_IDX] = flag;
    }

    public void setDataEnciphermentFilter(Boolean flag) {
        this.mask[DATA_ENCIPHERMENT_IDX] = flag;
    }

    public void setKeyAgreementFilter(Boolean flag) {
        this.mask[KEY_AGREEMENT_IDX] = flag;
    }

    public void setKeyCertificateSigningFilter(Boolean flag) {
        this.mask[KEY_CERT_SIGN_IDX] = flag;
    }

    public void setCRLSigningFilter(Boolean flag) {
        this.mask[CRL_SIGN_IDX] = flag;
    }

    public void setEncipherOnlyFilter(Boolean flag) {
        this.mask[ENCIPHER_ONLY_IDX] = flag;
    }

    public void setDecipherOnlyFilter(Boolean flag) {
        this.mask[DECIPHER_ONLY_IDX] = flag;
    }

    public boolean check(X509Certificate certificate) {
        boolean[] keyUsage = certificate.getKeyUsage();
        if (null == keyUsage) {
            LOG.debug("no key usage extension for certificate: " + certificate.getSubjectX500Principal());
            return false;
        }
        for (int idx = 0; idx < this.mask.length; idx++) {
            Boolean flag = this.mask[idx];
            if (null == flag) {
                continue;
            }
            if (false == flag) {
                if (keyUsage[idx]) {
                    LOG.debug("should not have key usage: " + idx);
                    return false;
                }
            } else {
                if (false == keyUsage[idx]) {
                    LOG.debug("missing key usage: " + idx);
                    return false;
                }
            }
        }
        LOG.debug("key usage checked");
        return true;
    }
}