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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.pqc.crypto.lms;

import java.io.IOException;

import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.pqc.crypto.MessageSigner;

public class LMSSigner
    implements MessageSigner
{
    private LMSPrivateKeyParameters privKey;
    private LMSPublicKeyParameters pubKey;

    public void init(boolean forSigning, CipherParameters param)
    {
         if (forSigning)
         {
             privKey = (LMSPrivateKeyParameters)param;
         }
         else
         {
             pubKey = (LMSPublicKeyParameters)param;
         }
    }

    public byte[] generateSignature(byte[] message)
    {
        try
        {
            return LMS.generateSign(privKey, message).getEncoded();
        }
        catch (IOException e)
        {
            throw new IllegalStateException("unable to encode signature: " + e.getMessage());
        }
    }

    public boolean verifySignature(byte[] message, byte[] signature)
    {
        try
        {
            return LMS.verifySignature(pubKey, LMSSignature.getInstance(signature), message);
        }
        catch (IOException e)
        {
            throw new IllegalStateException("unable to decode signature: " + e.getMessage());
        }
    }
}