Copyright (c) 2007, 2012 IBM Corporation and others.
This program and the accompanying materials are made available under the
terms of the Eclipse Public License 2.0 which accompanies this distribution,
and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors: IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2007, 2012 IBM Corporation and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which accompanies this distribution,
 * and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 * 
 * Contributors: IBM Corporation - initial API and implementation
 ******************************************************************************/
package org.eclipse.osgi.internal.signedcontent;

import java.security.cert.Certificate;
import org.eclipse.osgi.signedcontent.SignerInfo;

public class SignerInfoImpl implements SignerInfo {
	private final Certificate[] chain;
	private final String mdAlgorithm;
	volatile private Certificate trustAnchor;

	public SignerInfoImpl(Certificate[] chain, Certificate trustAnchor, String mdAlgorithm) {
		this.chain = chain;
		this.trustAnchor = trustAnchor;
		this.mdAlgorithm = mdAlgorithm;
	}

	@Override
	public Certificate[] getCertificateChain() {
		return chain;
	}

	@Override
	public Certificate getTrustAnchor() {
		return trustAnchor;
	}

	@Override
	public boolean isTrusted() {
		return trustAnchor != null;
	}

	void setTrustAnchor(Certificate trustAnchor) {
		this.trustAnchor = trustAnchor;
	}

	@Override
	public String getMessageDigestAlgorithm() {
		return mdAlgorithm;
	}

	@Override
	public int hashCode() {
		int result = mdAlgorithm.hashCode();
		for (Certificate cert : chain) {
			result += cert.hashCode();
		}
		// Note that we do not hash based on trustAnchor;
		// this changes dynamically but we need a constant hashCode for purposes of 
		// hashing in a Set.
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof SignerInfo))
			return false;
		if (obj == this)
			return true;
		SignerInfo other = (SignerInfo) obj;
		if (!mdAlgorithm.equals(other.getMessageDigestAlgorithm()))
			return false;
		Certificate[] otherCerts = other.getCertificateChain();
		if (otherCerts.length != chain.length)
			return false;
		for (int i = 0; i < chain.length; i++)
			if (!chain[i].equals(otherCerts[i]))
				return false;
		return trustAnchor == null ? other.getTrustAnchor() == null : trustAnchor.equals(other.getTrustAnchor());
	}
}