com.vvote.thirdparty.ximix.util.PartialPublicKeyInfo.java Source code

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Here is the source code for com.vvote.thirdparty.ximix.util.PartialPublicKeyInfo.java

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/**
 * Copyright 2013 Crypto Workshop Pty Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.vvote.thirdparty.ximix.util;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;

/**
 * Partial public key descriptor.
 */
public class PartialPublicKeyInfo extends ASN1Object {
    private final int sequenceNo;
    private final SubjectPublicKeyInfo partialKeyInfo;

    /**
     * Base constructor.
     *
     * @param sequenceNo the sequence number for the partial key in the threshold generation.
     * @param partialKeyInfo SubjectPublicKeyInfo representing the partial public key for this sequence number.
     */
    public PartialPublicKeyInfo(int sequenceNo, SubjectPublicKeyInfo partialKeyInfo) {
        this.sequenceNo = sequenceNo;
        this.partialKeyInfo = partialKeyInfo;
    }

    private PartialPublicKeyInfo(ASN1Sequence seq) {
        this.sequenceNo = ASN1Integer.getInstance(seq.getObjectAt(0)).getValue().intValue();
        this.partialKeyInfo = SubjectPublicKeyInfo.getInstance(seq.getObjectAt(1));
    }

    public static final PartialPublicKeyInfo getInstance(Object o) {
        if (o instanceof PartialPublicKeyInfo) {
            return (PartialPublicKeyInfo) o;
        } else if (o != null) {
            return new PartialPublicKeyInfo(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    @Override
    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(new ASN1Integer(sequenceNo));
        v.add(partialKeyInfo);

        return new DERSequence(v);
    }

    public SubjectPublicKeyInfo getPartialKeyInfo() {
        return partialKeyInfo;
    }

    public int getSequenceNo() {
        return sequenceNo;
    }
}