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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.crmf;

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.cms.IssuerAndSerialNumber;
import org.bouncycastle.util.Arrays;

/**
 * From RFC 2875 for Diffie-Hellman POP.
 *  *     DhSigStatic ::= SEQUENCE {
 *         IssuerAndSerial IssuerAndSerialNumber OPTIONAL,
 *         hashValue       MessageDigest
 *     }
 * 
 */
public class DhSigStatic
    extends ASN1Object
{
    private final IssuerAndSerialNumber issuerAndSerial;
    private final ASN1OctetString hashValue;

    public DhSigStatic(byte[] hashValue)
    {
        this(null, hashValue);
    }

    public DhSigStatic(IssuerAndSerialNumber issuerAndSerial, byte[] hashValue)
    {
        this.issuerAndSerial = issuerAndSerial;
        this.hashValue = new DEROctetString(Arrays.clone(hashValue));
    }

    public static DhSigStatic getInstance(Object o)
    {
        if (o instanceof DhSigStatic)
        {
            return (DhSigStatic)o;
        }
        else if (o != null)
        {
            return new DhSigStatic(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    private DhSigStatic(ASN1Sequence seq)
    {
        if (seq.size() == 1)
        {
            issuerAndSerial = null;
            hashValue = ASN1OctetString.getInstance(seq.getObjectAt(0));
        }
        else if (seq.size() == 2)
        {
            issuerAndSerial = IssuerAndSerialNumber.getInstance(seq.getObjectAt(0));
            hashValue = ASN1OctetString.getInstance(seq.getObjectAt(1));
        }
        else
        {
            throw new IllegalArgumentException("sequence wrong length for DhSigStatic");
        }
    }

    public IssuerAndSerialNumber getIssuerAndSerial()
    {
        return issuerAndSerial;
    }

    public byte[] getHashValue()
    {
        return Arrays.clone(hashValue.getOctets());
    }

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

        if (issuerAndSerial != null)
        {
            v.add(issuerAndSerial);
        }

        v.add(hashValue);

        return new DERSequence(v);
    }
}