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Java

DigestInfo.java：源码内容

							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 DEREncodable
{
    private byte[]                  digest;
    private AlgorithmIdentifier     algId;
    public static DigestInfo getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }
    public static DigestInfo getInstance(
        Object  obj)
    {
        if (obj instanceof DigestInfo)
        {
            return (DigestInfo)obj;
        }
        else if (obj instanceof ASN1Sequence)
        {
            return new DigestInfo((ASN1Sequence)obj);
        }
        throw new IllegalArgumentException("unknown object in factory");
    }
    public DigestInfo(
        AlgorithmIdentifier  algId,
        byte[]               digest)
    {
        this.digest = digest;
        this.algId = algId;
    }
    public DigestInfo(
        ASN1Sequence  obj)
    {
        Enumeration             e = obj.getObjects();
        algId = AlgorithmIdentifier.getInstance(e.nextElement());
        digest = ((ASN1OctetString)e.nextElement()).getOctets();
    }
    public AlgorithmIdentifier getAlgorithmId()
    {
        return algId;
    }
    public byte[] getDigest()
    {
        return digest;
    }
    public DERObject getDERObject()
    {
        ASN1EncodableVector  v = new ASN1EncodableVector();
        v.add(algId);
        v.add(new DEROctetString(digest));
        return new DERSequence(v);
    }
}

						