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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 1.7. Note: this package includes the IDEA and NTRU encryption algorithms.

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package org.bouncycastle.math.field;

import org.bouncycastle.util.Arrays;

class GF2Polynomial implements Polynomial
{
    protected final int[] exponents;

    GF2Polynomial(int[] exponents)
    {
        this.exponents = Arrays.clone(exponents);
    }

    public int getDegree()
    {
        return exponents[exponents.length - 1];
    }

    public int[] getExponentsPresent()
    {
        return Arrays.clone(exponents);
    }

    public boolean equals(Object obj)
    {
        if (this == obj)
        {
            return true;
        }
        if (!(obj instanceof GF2Polynomial))
        {
            return false;
        }
        GF2Polynomial other = (GF2Polynomial)obj;
        return Arrays.areEqual(exponents, other.exponents);
    }

    public int hashCode()
    {
        return Arrays.hashCode(exponents);
    }
}