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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.

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package org.bouncycastle.jcajce.spec;

import java.security.spec.KeySpec;

import org.bouncycastle.util.Arrays;

/**
 * PrivateKeySpec for ML-DSA.
 */
public class MLKEMPrivateKeySpec
    implements KeySpec
{
    private final byte[] data;
    private final byte[] publicData;
    private final MLKEMParameterSpec params;
    private final boolean isSeed;

    public MLKEMPrivateKeySpec(MLKEMParameterSpec params, byte[] seed)
    {
       if (seed.length != 64)
       {
            throw new IllegalArgumentException("incorrect length for seed");
       }

       this.isSeed = true;
       this.params = params;
       this.data = Arrays.clone(seed);
       this.publicData = null;
    }

    /**
     * Create a KeySpec using the long form private and public data.
     *
     * @param params the parameter set to use with the encodings.
     * @param privateData the long form private key.
     * @param publicData the long form public key - may be null.
     */
    public MLKEMPrivateKeySpec(MLKEMParameterSpec params, byte[] privateData, byte[] publicData)
    {
       this.isSeed = false;
       this.params = params;
       this.data = Arrays.clone(privateData);
       this.publicData = Arrays.clone(publicData);
    }

    public boolean isSeed()
    {
        return isSeed;
    }

    public MLKEMParameterSpec getParameterSpec()
    {
        return params;
    }

    public byte[] getSeed()
    {
        if (isSeed())
        {
            return Arrays.clone(data);
        }

        throw new IllegalStateException("KeySpec represents long form");
    }

    public byte[] getPrivateData()
    {
        if (!isSeed())
        {
            return Arrays.clone(data);
        }

        throw new IllegalStateException("KeySpec represents seed");
    }

    public byte[] getPublicData()
    {
        if (!isSeed())
        {
            return Arrays.clone(publicData);
        }

        throw new IllegalStateException("KeySpec represents long form");
    }
}