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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 1.8 and up.

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package org.bouncycastle.pqc.crypto.lms;

import org.bouncycastle.crypto.Digest;

class LmsUtils
{
    static void u32str(int n, Digest d)
    {
        d.update((byte)(n >>> 24));
        d.update((byte)(n >>> 16));
        d.update((byte)(n >>> 8));
        d.update((byte)(n));
    }

    static void u16str(short n, Digest d)
    {
        d.update((byte)(n >>> 8));
        d.update((byte)(n));
    }

    static void byteArray(byte[] array, Digest digest)
    {
        digest.update(array, 0, array.length);
    }

    static void byteArray(byte[] array, int start, int len, Digest digest)
    {
        digest.update(array, start, len);
    }

    static int calculateStrength(LMSParameters lmsParameters)
    {
        if (lmsParameters == null)
        {
            throw new NullPointerException("lmsParameters cannot be null");
        }

        LMSigParameters sigParameters = lmsParameters.getLMSigParam();
        return (1 << sigParameters.getH()) * sigParameters.getM();
    }
}