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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 and up.
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package org.bouncycastle.crypto.digests;

import org.bouncycastle.crypto.Digest;

/**
 * Base class for Haraka v2, https://eprint.iacr.org/2016/098.pdf
 */
public abstract class HarakaBase
    implements Digest
{
    protected static final int DIGEST_SIZE = 32;

    private static final byte[][] S = new byte[][]{
        {(byte)0x63, (byte)0x7c, (byte)0x77, (byte)0x7b, (byte)0xf2, (byte)0x6b, (byte)0x6f, (byte)0xc5, (byte)0x30, (byte)0x01, (byte)0x67, (byte)0x2b, (byte)0xfe, (byte)0xd7, (byte)0xab, (byte)0x76},
        {(byte)0xca, (byte)0x82, (byte)0xc9, (byte)0x7d, (byte)0xfa, (byte)0x59, (byte)0x47, (byte)0xf0, (byte)0xad, (byte)0xd4, (byte)0xa2, (byte)0xaf, (byte)0x9c, (byte)0xa4, (byte)0x72, (byte)0xc0},
        {(byte)0xb7, (byte)0xfd, (byte)0x93, (byte)0x26, (byte)0x36, (byte)0x3f, (byte)0xf7, (byte)0xcc, (byte)0x34, (byte)0xa5, (byte)0xe5, (byte)0xf1, (byte)0x71, (byte)0xd8, (byte)0x31, (byte)0x15},
        {(byte)0x04, (byte)0xc7, (byte)0x23, (byte)0xc3, (byte)0x18, (byte)0x96, (byte)0x05, (byte)0x9a, (byte)0x07, (byte)0x12, (byte)0x80, (byte)0xe2, (byte)0xeb, (byte)0x27, (byte)0xb2, (byte)0x75},
        {(byte)0x09, (byte)0x83, (byte)0x2c, (byte)0x1a, (byte)0x1b, (byte)0x6e, (byte)0x5a, (byte)0xa0, (byte)0x52, (byte)0x3b, (byte)0xd6, (byte)0xb3, (byte)0x29, (byte)0xe3, (byte)0x2f, (byte)0x84},
        {(byte)0x53, (byte)0xd1, (byte)0x00, (byte)0xed, (byte)0x20, (byte)0xfc, (byte)0xb1, (byte)0x5b, (byte)0x6a, (byte)0xcb, (byte)0xbe, (byte)0x39, (byte)0x4a, (byte)0x4c, (byte)0x58, (byte)0xcf},
        {(byte)0xd0, (byte)0xef, (byte)0xaa, (byte)0xfb, (byte)0x43, (byte)0x4d, (byte)0x33, (byte)0x85, (byte)0x45, (byte)0xf9, (byte)0x02, (byte)0x7f, (byte)0x50, (byte)0x3c, (byte)0x9f, (byte)0xa8},
        {(byte)0x51, (byte)0xa3, (byte)0x40, (byte)0x8f, (byte)0x92, (byte)0x9d, (byte)0x38, (byte)0xf5, (byte)0xbc, (byte)0xb6, (byte)0xda, (byte)0x21, (byte)0x10, (byte)0xff, (byte)0xf3, (byte)0xd2},
        {(byte)0xcd, (byte)0x0c, (byte)0x13, (byte)0xec, (byte)0x5f, (byte)0x97, (byte)0x44, (byte)0x17, (byte)0xc4, (byte)0xa7, (byte)0x7e, (byte)0x3d, (byte)0x64, (byte)0x5d, (byte)0x19, (byte)0x73},
        {(byte)0x60, (byte)0x81, (byte)0x4f, (byte)0xdc, (byte)0x22, (byte)0x2a, (byte)0x90, (byte)0x88, (byte)0x46, (byte)0xee, (byte)0xb8, (byte)0x14, (byte)0xde, (byte)0x5e, (byte)0x0b, (byte)0xdb},
        {(byte)0xe0, (byte)0x32, (byte)0x3a, (byte)0x0a, (byte)0x49, (byte)0x06, (byte)0x24, (byte)0x5c, (byte)0xc2, (byte)0xd3, (byte)0xac, (byte)0x62, (byte)0x91, (byte)0x95, (byte)0xe4, (byte)0x79},
        {(byte)0xe7, (byte)0xc8, (byte)0x37, (byte)0x6d, (byte)0x8d, (byte)0xd5, (byte)0x4e, (byte)0xa9, (byte)0x6c, (byte)0x56, (byte)0xf4, (byte)0xea, (byte)0x65, (byte)0x7a, (byte)0xae, (byte)0x08},
        {(byte)0xba, (byte)0x78, (byte)0x25, (byte)0x2e, (byte)0x1c, (byte)0xa6, (byte)0xb4, (byte)0xc6, (byte)0xe8, (byte)0xdd, (byte)0x74, (byte)0x1f, (byte)0x4b, (byte)0xbd, (byte)0x8b, (byte)0x8a},
        {(byte)0x70, (byte)0x3e, (byte)0xb5, (byte)0x66, (byte)0x48, (byte)0x03, (byte)0xf6, (byte)0x0e, (byte)0x61, (byte)0x35, (byte)0x57, (byte)0xb9, (byte)0x86, (byte)0xc1, (byte)0x1d, (byte)0x9e},
        {(byte)0xe1, (byte)0xf8, (byte)0x98, (byte)0x11, (byte)0x69, (byte)0xd9, (byte)0x8e, (byte)0x94, (byte)0x9b, (byte)0x1e, (byte)0x87, (byte)0xe9, (byte)0xce, (byte)0x55, (byte)0x28, (byte)0xdf},
        {(byte)0x8c, (byte)0xa1, (byte)0x89, (byte)0x0d, (byte)0xbf, (byte)0xe6, (byte)0x42, (byte)0x68, (byte)0x41, (byte)0x99, (byte)0x2d, (byte)0x0f, (byte)0xb0, (byte)0x54, (byte)0xbb, (byte)0x16}};

    static byte sBox(byte x)
    {
        return S[(((x & 0xFF) >>> 4))][x & 0xF];
    }

    static byte[] subBytes(byte[] s)
    {
        byte[] out = new byte[s.length];
        out[0] = sBox(s[0]);
        out[1] = sBox(s[1]);
        out[2] = sBox(s[2]);
        out[3] = sBox(s[3]);
        out[4] = sBox(s[4]);
        out[5] = sBox(s[5]);
        out[6] = sBox(s[6]);
        out[7] = sBox(s[7]);
        out[8] = sBox(s[8]);
        out[9] = sBox(s[9]);
        out[10] = sBox(s[10]);
        out[11] = sBox(s[11]);
        out[12] = sBox(s[12]);
        out[13] = sBox(s[13]);
        out[14] = sBox(s[14]);
        out[15] = sBox(s[15]);
        return out;
    }

    static byte[] shiftRows(byte[] s)
    {
        return new byte[]{
            s[0], s[5], s[10], s[15],
            s[4], s[9], s[14], s[3],
            s[8], s[13], s[2], s[7],
            s[12], s[1], s[6], s[11]
        };
    }

    static byte[] aesEnc(byte[] s, byte[] rk)
    {
        s = subBytes(s);
        s = shiftRows(s);
        s = mixColumns(s);
        xorReverse(s, rk);
        return s;
    }

    static byte xTime(byte x)
    {
        if ((x >>> 7) > 0)
        {
            return (byte)(((x << 1) ^ 0x1b) & 0xff);
        }
        else
        {
            return (byte)((x << 1) & 0xff);
        }
    }


    static void xorReverse(byte[] x, byte[] y)
    {
        x[0] = (byte)(x[0] ^ y[15]);
        x[1] = (byte)(x[1] ^ y[14]);
        x[2] = (byte)(x[2] ^ y[13]);
        x[3] = (byte)(x[3] ^ y[12]);
        x[4] = (byte)(x[4] ^ y[11]);
        x[5] = (byte)(x[5] ^ y[10]);
        x[6] = (byte)(x[6] ^ y[9]);
        x[7] = (byte)(x[7] ^ y[8]);
        x[8] = (byte)(x[8] ^ y[7]);
        x[9] = (byte)(x[9] ^ y[6]);
        x[10] = (byte)(x[10] ^ y[5]);
        x[11] = (byte)(x[11] ^ y[4]);
        x[12] = (byte)(x[12] ^ y[3]);
        x[13] = (byte)(x[13] ^ y[2]);
        x[14] = (byte)(x[14] ^ y[1]);
        x[15] = (byte)(x[15] ^ y[0]);
    }


    static byte[] xor(byte[] x, byte[] y, int yStart)
    {
        byte[] out = new byte[16];
        for (int i = 0; i < out.length; i++)
        {
            out[i] = (byte)(x[i] ^ y[yStart++]);
        }
        return out;
    }


    static private byte[] mixColumns(byte[] s)
    {
        byte[] out = new byte[s.length];
        int j = 0;
        for (int i = 0; i < 4; i++)
        {
            out[j++] = (byte)(xTime(s[4 * i]) ^ xTime(s[4 * i + 1]) ^ s[4 * i + 1] ^ s[4 * i + 2] ^ s[4 * i + 3]);
            out[j++] = (byte)(s[4 * i] ^ xTime(s[4 * i + 1]) ^ xTime(s[4 * i + 2]) ^ s[4 * i + 2] ^ s[4 * i + 3]);
            out[j++] = (byte)(s[4 * i] ^ s[4 * i + 1] ^ xTime(s[4 * i + 2]) ^ xTime(s[4 * i + 3]) ^ s[4 * i + 3]);
            out[j++] = (byte)(xTime(s[4 * i]) ^ s[4 * i] ^ s[4 * i + 1] ^ s[4 * i + 2] ^ xTime(s[4 * i + 3]));
        }

        return out;
    }

    public int getDigestSize()
    {
        return DIGEST_SIZE;
    }
}