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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.6 for Java 8 and later.

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package org.bouncycastle.crypto.modes.gcm;

public class BasicGCMMultiplier
    implements GCMMultiplier
{
    private long[] H;

    public void init(byte[] H)
    {
        this.H = GCMUtil.asLongs(H);
    }

    public void multiplyH(byte[] x)
    {
        GCMUtil.multiply(x, H);
    }
}