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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.util;

/**
 * @deprecated use org.bouncycastle.util.pack
 */
public abstract class Pack
{
    public static int bigEndianToInt(byte[] bs, int off)
    {
        int n = bs[  off] << 24;
        n |= (bs[++off] & 0xff) << 16;
        n |= (bs[++off] & 0xff) << 8;
        n |= (bs[++off] & 0xff);
        return n;
    }

    public static void bigEndianToInt(byte[] bs, int off, int[] ns)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            ns[i] = bigEndianToInt(bs, off);
            off += 4;
        }
    }

    public static byte[] intToBigEndian(int n)
    {
        byte[] bs = new byte[4];
        intToBigEndian(n, bs, 0);
        return bs;
    }

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

    public static byte[] intToBigEndian(int[] ns)
    {
        byte[] bs = new byte[4 * ns.length];
        intToBigEndian(ns, bs, 0);
        return bs;
    }

    public static void intToBigEndian(int[] ns, byte[] bs, int off)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            intToBigEndian(ns[i], bs, off);
            off += 4;
        }
    }

    public static long bigEndianToLong(byte[] bs, int off)
    {
        int hi = bigEndianToInt(bs, off);
        int lo = bigEndianToInt(bs, off + 4);
        return ((long)(hi & 0xffffffffL) << 32) | (long)(lo & 0xffffffffL);
    }

    public static void bigEndianToLong(byte[] bs, int off, long[] ns)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            ns[i] = bigEndianToLong(bs, off);
            off += 8;
        }
    }

    public static byte[] longToBigEndian(long n)
    {
        byte[] bs = new byte[8];
        longToBigEndian(n, bs, 0);
        return bs;
    }

    public static void longToBigEndian(long n, byte[] bs, int off)
    {
        intToBigEndian((int)(n >>> 32), bs, off);
        intToBigEndian((int)(n & 0xffffffffL), bs, off + 4);
    }

    public static byte[] longToBigEndian(long[] ns)
    {
        byte[] bs = new byte[8 * ns.length];
        longToBigEndian(ns, bs, 0);
        return bs;
    }

    public static void longToBigEndian(long[] ns, byte[] bs, int off)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            longToBigEndian(ns[i], bs, off);
            off += 8;
        }
    }

    public static int littleEndianToInt(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;
    }

    public static void littleEndianToInt(byte[] bs, int off, int[] ns)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            ns[i] = littleEndianToInt(bs, off);
            off += 4;
        }
    }

    public static void littleEndianToInt(byte[] bs, int bOff, int[] ns, int nOff, int count)
    {
        for (int i = 0; i < count; ++i)
        {
            ns[nOff + i] = littleEndianToInt(bs, bOff);
            bOff += 4;
        }
    }

    public static byte[] intToLittleEndian(int n)
    {
        byte[] bs = new byte[4];
        intToLittleEndian(n, bs, 0);
        return bs;
    }

    public static void intToLittleEndian(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);
    }

    public static byte[] intToLittleEndian(int[] ns)
    {
        byte[] bs = new byte[4 * ns.length];
        intToLittleEndian(ns, bs, 0);
        return bs;
    }

    public static void intToLittleEndian(int[] ns, byte[] bs, int off)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            intToLittleEndian(ns[i], bs, off);
            off += 4;
        }
    }

    public static long littleEndianToLong(byte[] bs, int off)
    {
        int lo = littleEndianToInt(bs, off);
        int hi = littleEndianToInt(bs, off + 4);
        return ((long)(hi & 0xffffffffL) << 32) | (long)(lo & 0xffffffffL);
    }

    public static void littleEndianToLong(byte[] bs, int off, long[] ns)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            ns[i] = littleEndianToLong(bs, off);
            off += 8;
        }
    }

    public static byte[] longToLittleEndian(long n)
    {
        byte[] bs = new byte[8];
        longToLittleEndian(n, bs, 0);
        return bs;
    }

    public static void longToLittleEndian(long n, byte[] bs, int off)
    {
        intToLittleEndian((int)(n & 0xffffffffL), bs, off);
        intToLittleEndian((int)(n >>> 32), bs, off + 4);
    }

    public static byte[] longToLittleEndian(long[] ns)
    {
        byte[] bs = new byte[8 * ns.length];
        longToLittleEndian(ns, bs, 0);
        return bs;
    }

    public static void longToLittleEndian(long[] ns, byte[] bs, int off)
    {
        for (int i = 0; i < ns.length; ++i)
        {
            longToLittleEndian(ns[i], bs, off);
            off += 8;
        }
    }
}