digestinfo.java

来自「《移动Agent技术》一书的所有章节源代码。」· Java 代码 · 共 58 行

package org.bouncycastle.asn1.x509;

import java.util.Enumeration;

import org.bouncycastle.asn1.*;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;

/**
 * <pre>
 * DigestInfo::=SEQUENCE{
 *          digestAlgorithm  AlgorithmIdentifier,
 *          digest OCTET STRING }
 * </pre>
 */
public class DigestInfo
    implements PKCSObjectIdentifiers, DEREncodable
{
    private byte[]                  digest;
    private AlgorithmIdentifier     algId;

    public DigestInfo(
        AlgorithmIdentifier  algId,
        byte[]               digest)
    {
        this.digest = digest;
        this.algId = algId;
    }

    public DigestInfo(
        DERConstructedSequence  seq)
    {
        Enumeration             e = seq.getObjects();

        algId = new AlgorithmIdentifier((DERConstructedSequence)e.nextElement());
        digest = ((DEROctetString)e.nextElement()).getOctets();
    }

    public AlgorithmIdentifier getAlgorithmId()
    {
        return algId;
    }

    public byte[] getDigest()
    {
        return digest;
    }

    public DERObject getDERObject()
    {
        DERConstructedSequence  seq = new DERConstructedSequence();

        seq.addObject(algId);
        seq.addObject(new DEROctetString(digest));

        return seq;
    }
}