eu.europa.esig.dss.TokenIdentifier.java Source code

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Here is the source code for eu.europa.esig.dss.TokenIdentifier.java

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/**
 * DSS - Digital Signature Services
 * Copyright (C) 2015 European Commission, provided under the CEF programme
 *
 * This file is part of the "DSS - Digital Signature Services" project.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package eu.europa.esig.dss;

import java.security.MessageDigest;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;

import org.apache.commons.codec.binary.Hex;

import eu.europa.esig.dss.x509.Token;

/**
 * This class is used to obtain a unique id for Token
 */
public final class TokenIdentifier {

    private Digest tokenDigest;

    private TokenIdentifier(byte[] encodedToken) {
        if (encodedToken == null) {
            throw new DSSException("The encodedToken cannot be null!");
        }
        try {
            DigestAlgorithm algo = DigestAlgorithm.SHA256;
            MessageDigest md = MessageDigest.getInstance("SHA-256");
            byte[] digestValue = md.digest(encodedToken);

            Digest digest = new Digest(algo, digestValue);
            this.tokenDigest = digest;
        } catch (Exception e) {
            throw new DSSException(e);
        }
    }

    public TokenIdentifier(final Token token) {
        this(token.getEncoded());
    }

    /**
     * Return an ID conformant to XML Id
     */
    public String asXmlId() {
        return Hex.encodeHexString(tokenDigest.getValue());
    }

    /**
     * Return the DSS certificate's unique id for a given
     * {@link X509Certificate}.
     *
     * @param cert
     * @return
     * @deprecated Use constructor instead
     */
    @Deprecated
    public static TokenIdentifier getId(final X509Certificate cert) {
        try {
            return new TokenIdentifier(cert.getEncoded());
        } catch (CertificateEncodingException e) {
            throw new DSSException(e);
        }
    }

    @Override
    public String toString() {
        return "{id:" + tokenDigest + "}";
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((tokenDigest == null) ? 0 : tokenDigest.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        TokenIdentifier other = (TokenIdentifier) obj;
        if (tokenDigest == null) {
            if (other.tokenDigest != null)
                return false;
        } else if (!tokenDigest.equals(other.tokenDigest))
            return false;
        return true;
    }

}