org.bouncycastle.asn1.tsp.MessageImprint.java Source code

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Here is the source code for org.bouncycastle.asn1.tsp.MessageImprint.java

Source

package org.bouncycastle.asn1.tsp;

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.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Arrays;

public class MessageImprint extends ASN1Object {
    AlgorithmIdentifier hashAlgorithm;
    byte[] hashedMessage;

    /**
     * @param o
     * @return a MessageImprint object.
     */
    public static MessageImprint getInstance(Object o) {
        if (o instanceof MessageImprint) {
            return (MessageImprint) o;
        }

        if (o != null) {
            return new MessageImprint(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    private MessageImprint(ASN1Sequence seq) {
        this.hashAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(0));
        this.hashedMessage = ASN1OctetString.getInstance(seq.getObjectAt(1)).getOctets();
    }

    public MessageImprint(AlgorithmIdentifier hashAlgorithm, byte[] hashedMessage) {
        this.hashAlgorithm = hashAlgorithm;
        this.hashedMessage = Arrays.clone(hashedMessage);
    }

    public AlgorithmIdentifier getHashAlgorithm() {
        return hashAlgorithm;
    }

    public byte[] getHashedMessage() {
        return Arrays.clone(hashedMessage);
    }

    /**
     * <pre>
     *    MessageImprint ::= SEQUENCE  {
     *       hashAlgorithm                AlgorithmIdentifier,
     *       hashedMessage                OCTET STRING  }
     * </pre>
     */
    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

        v.add(hashAlgorithm);
        v.add(new DEROctetString(hashedMessage));

        return new DERSequence(v);
    }
}