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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 1.5 to JDK 1.8.

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package org.bouncycastle.pqc.crypto.mldsa;

import org.bouncycastle.util.Arrays;

public class MLDSAPrivateKeyParameters
    extends MLDSAKeyParameters
{
    final byte[] rho;
    final byte[] k;
    final byte[] tr;
    final byte[] s1;
    final byte[] s2;
    final byte[] t0;

    private final byte[] t1;
    private final byte[] seed;

    public MLDSAPrivateKeyParameters(MLDSAParameters params, byte[] seed)
    {
        super(true, params);
        byte[][] keyDetails = params.getEngine(null).generateKeyPairInternal(seed);

        this.rho = keyDetails[0];
        this.k = keyDetails[1];
        this.tr = keyDetails[2];
        this.s1 = keyDetails[3];
        this.s2 = keyDetails[4];
        this.t0 = keyDetails[5];
        this.t1 = keyDetails[6];
        this.seed = keyDetails[7];
    }

    public MLDSAPrivateKeyParameters(MLDSAParameters params, byte[] rho, byte[] K, byte[] tr, byte[] s1, byte[] s2, byte[] t0, byte[] t1)
    {
        this(params, rho, K, tr, s1, s2, t0, t1, null);
    }

    public MLDSAPrivateKeyParameters(MLDSAParameters params, byte[] rho, byte[] K, byte[] tr, byte[] s1, byte[] s2, byte[] t0, byte[] t1, byte[] seed)
    {
        super(true, params);
        this.rho = Arrays.clone(rho);
        this.k = Arrays.clone(K);
        this.tr = Arrays.clone(tr);
        this.s1 = Arrays.clone(s1);
        this.s2 = Arrays.clone(s2);
        this.t0 = Arrays.clone(t0);
        this.t1 = Arrays.clone(t1);
        this.seed = Arrays.clone(seed);
    }

    public MLDSAPrivateKeyParameters(MLDSAParameters params, byte[] encoding, MLDSAPublicKeyParameters pubKey)
    {
        super(true, params);

        MLDSAEngine eng = params.getEngine(null);
        int index = 0;
        this.rho = Arrays.copyOfRange(encoding, 0, MLDSAEngine.SeedBytes);
        index += MLDSAEngine.SeedBytes;
        this.k = Arrays.copyOfRange(encoding, index, index + MLDSAEngine.SeedBytes);
        index += MLDSAEngine.SeedBytes;
        this.tr = Arrays.copyOfRange(encoding, index, index + MLDSAEngine.TrBytes);
        index += MLDSAEngine.TrBytes;
        int delta = eng.getDilithiumL() * eng.getDilithiumPolyEtaPackedBytes();
        this.s1 = Arrays.copyOfRange(encoding, index, index + delta);
        index += delta;
        delta = eng.getDilithiumK() * eng.getDilithiumPolyEtaPackedBytes();
        this.s2 = Arrays.copyOfRange(encoding, index, index + delta);
        index += delta;
        delta = eng.getDilithiumK() * MLDSAEngine.DilithiumPolyT0PackedBytes;
        this.t0 = Arrays.copyOfRange(encoding, index, index + delta);
        index += delta;

        if (pubKey != null)
        {
            this.t1 = pubKey.getT1();
        }
        else
        {
            this.t1 = null;
        }
        this.seed = null;
    }

    public byte[] getEncoded()
    {
        return Arrays.concatenate(new byte[][]{rho, k, tr, s1, s2, t0});
    }

    public byte[] getK()
    {
        return Arrays.clone(k);
    }

    /**
     * @deprecated Use {@link #getEncoded()} instead.
     */
    public byte[] getPrivateKey()
    {
        return getEncoded();
    }

    public byte[] getPublicKey()
    {
        return MLDSAPublicKeyParameters.getEncoded(rho, t1);
    }

    public byte[] getSeed()
    {
        return Arrays.clone(seed);
    }

    public MLDSAPublicKeyParameters getPublicKeyParameters()
    {
        return new MLDSAPublicKeyParameters(getParameters(), rho, t1);
    }

    public byte[] getRho()
    {
        return Arrays.clone(rho);
    }

    public byte[] getS1()
    {
        return Arrays.clone(s1);
    }

    public byte[] getS2()
    {
        return Arrays.clone(s2);
    }

    public byte[] getT0()
    {
        return Arrays.clone(t0);
    }

    public byte[] getT1()
    {
        return Arrays.clone(t1);
    }

    public byte[] getTr()
    {
        return Arrays.clone(tr);
    }
}