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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. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.math.raw;

public abstract class Bits
{
    public static int bitPermuteStep(int x, int m, int s)
    {
        int t = (x ^ (x >>> s)) & m;
        return  (t ^ (t <<  s)) ^ x;
    }

    public static long bitPermuteStep(long x, long m, int s)
    {
        long t = (x ^ (x >>> s)) & m;
        return   (t ^ (t <<  s)) ^ x;
    }

    public static int bitPermuteStepSimple(int x, int m, int s)
    {
        return ((x & m) << s) | ((x >>> s) & m);
    }

    public static long bitPermuteStepSimple(long x, long m, int s)
    {
        return ((x & m) << s) | ((x >>> s) & m);
    }
}