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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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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;
    
    /**
     * Return an instance of MessageImprint, or null, based on o.
     * 
     * @param o the object to be converted.
     * @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)
    {
        if (seq.size() == 2)
        {
            this.hashAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(0));
            this.hashedMessage = ASN1OctetString.getInstance(seq.getObjectAt(1)).getOctets();
        }
        else
        {
            throw new IllegalArgumentException("sequence has wrong number of elements");
        }
    }
    
    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);
    }
    
    /**
     *      *    MessageImprint ::= SEQUENCE  {
     *       hashAlgorithm                AlgorithmIdentifier,
     *       hashedMessage                OCTET STRING  }
     * 
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(2);

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

        return new DERSequence(v);
    }
}