org.bouncycastle.asn1.x509.DigestInfo.java Source code

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Here is the source code for org.bouncycastle.asn1.x509.DigestInfo.java

Source

package org.bouncycastle.asn1.x509;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.util.Arrays;

/**
 * The DigestInfo object.
 * <pre>
 * DigestInfo::=SEQUENCE{
 *          digestAlgorithm  AlgorithmIdentifier,
 *          digest OCTET STRING }
 * </pre>
 */
public class DigestInfo extends ASN1Object {
    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 != null) {
            return new DigestInfo(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

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

    public DigestInfo(ASN1Sequence obj) {
        Enumeration e = obj.getObjects();

        algId = AlgorithmIdentifier.getInstance(e.nextElement());
        digest = ASN1OctetString.getInstance(e.nextElement()).getOctets();
    }

    public AlgorithmIdentifier getAlgorithmId() {
        return algId;
    }

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

    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        v.add(algId);
        v.add(new DEROctetString(digest));

        return new DERSequence(v);
    }
}