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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.math.ec.rfc8032;

abstract class Codec
{
    static int decode16(byte[] bs, int off)
    {
        int n = bs[off] & 0xFF;
        n |= (bs[++off] & 0xFF) << 8;
        return n;
    }

    static int decode24(byte[] bs, int off)
    {
        int n = bs[  off] & 0xFF;
        n |= (bs[++off] & 0xFF) << 8;
        n |= (bs[++off] & 0xFF) << 16;
        return n;
    }

    static int decode32(byte[] bs, int off)
    {
        int n = bs[off] & 0xFF;
        n |= (bs[++off] & 0xFF) << 8;
        n |= (bs[++off] & 0xFF) << 16;
        n |=  bs[++off]         << 24;
        return n;
    }

    static void decode32(byte[] bs, int bsOff, int[] n, int nOff, int nLen)
    {
        for (int i = 0; i < nLen; ++i)
        {
            n[nOff + i] = decode32(bs, bsOff + i * 4);
        }
    }

    static void encode24(int n, byte[] bs, int off)
    {
        bs[  off] = (byte)(n       );
        bs[++off] = (byte)(n >>>  8);
        bs[++off] = (byte)(n >>> 16);
    }

    static void encode32(int n, byte[] bs, int off)
    {
        bs[  off] = (byte)(n       );
        bs[++off] = (byte)(n >>>  8);
        bs[++off] = (byte)(n >>> 16);
        bs[++off] = (byte)(n >>> 24);
    }

    static void encode32(int[] n, int nOff, int nLen, byte[] bs, int bsOff)
    {
        for (int i = 0; i < nLen; ++i)
        {
            encode32(n[nOff + i], bs, bsOff + i * 4);
        }
    }

    static void encode56(long n, byte[] bs, int off)
    {
        encode32((int)n, bs, off);
        encode24((int)(n >>> 32), bs, off + 4);
    }
}