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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.crystals.dilithium;

import org.bouncycastle.util.Arrays;

public class DilithiumPublicKeyParameters
    extends DilithiumKeyParameters
{
    static byte[] getEncoded(byte[] rho, byte[] t1)
    {
        return Arrays.concatenate(rho, t1);
    }

    final byte[] rho;
    final byte[] t1;

    public DilithiumPublicKeyParameters(DilithiumParameters params, byte[] encoding)
    {
        super(false, params);
        this.rho = Arrays.copyOfRange(encoding, 0, DilithiumEngine.SeedBytes);
        this.t1 = Arrays.copyOfRange(encoding, DilithiumEngine.SeedBytes, encoding.length);
    }

    public DilithiumPublicKeyParameters(DilithiumParameters params, byte[] rho, byte[] t1)
    {
        super(false, params);
        this.rho = Arrays.clone(rho);
        this.t1 = Arrays.clone(t1);
    }

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

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

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