de.fraunhofer.fokus.openeid.ca.SignedData.java Source code

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Here is the source code for de.fraunhofer.fokus.openeid.ca.SignedData.java

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/*******************************************************************************
 * Implementation of the protocols PACE, Terminal Authentication and Chip 
 * Authentication (client side) with respect to the according BSI standards.
 * 
 * Copyright (C) 2013  Fraunhofer-Gesellschaft
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package de.fraunhofer.fokus.openeid.ca;

import java.io.IOException;
import java.util.List;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.util.ASN1Dump;

import de.fraunhofer.fokus.openeid.pace.DerUtils;

public class SignedData {

    DERObject signedData;

    public SignedData(DEROctetString object) throws IOException {
        ASN1InputStream signedDataReader = new ASN1InputStream(object.getOctets());
        signedData = signedDataReader.readObject();
        signedDataReader.close();
    }

    public ChipAuthenticationPublicKeyInfo getChipAuthenticationPublicKeyInfo(Integer keyId) {
        List<DERObject> keys = DerUtils.getByOid(PublicKeyOID.ID_PK_ECDH, signedData);
        keys.addAll(DerUtils.getByOid(PublicKeyOID.ID_PK_DH, signedData));

        for (DERObject ecdhKey : keys) {
            ChipAuthenticationPublicKeyInfo publicKeyInfo = new ChipAuthenticationPublicKeyInfo(
                    (DERSequence) ecdhKey);
            if (keyId == null) {
                // if we don't care about the keyId
                return publicKeyInfo;
            } else {
                // here we care about the keyId 
                Integer foundKeyId = publicKeyInfo.getKeyId();
                if (foundKeyId != null) {
                    /*
                     * we need to compare against a keyId, 
                     * which is stored in the publicKeyInfo
                     */
                    if (keyId.equals(foundKeyId)) {
                        return publicKeyInfo;
                    }
                }
            }
        }
        //we couldn't find a public key meeting the requirements 
        return null;
    }

    public DERObject getDerObject() {
        return signedData;
    }

    @Override
    public String toString() {
        return ASN1Dump.dumpAsString(signedData, true);
    }
}