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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.util;

/**
 * Utility methods and constants for longs.
 */
public class Longs
{
    public static final int BYTES = 8;
    public static final int SIZE = Long.SIZE;

    public static int numberOfLeadingZeros(long i)
    {
        return Long.numberOfLeadingZeros(i);
    }

    public static int numberOfTrailingZeros(long i)
    {
        return Long.numberOfTrailingZeros(i);
    }

    public static long reverse(long i)
    {
        return Long.reverse(i);
    }

    public static long reverseBytes(long i)
    {
        return Long.reverseBytes(i);
    }

    public static long rotateLeft(long i, int distance)
    {
        return Long.rotateLeft(i, distance);
    }

    public static long rotateRight(long i, int distance)
    {
        return Long.rotateRight(i, distance);
    }

    public static Long valueOf(long value)
    {
        return Long.valueOf(value);
    }
}