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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.cms;

import org.spongycastle.util.Arrays;

import java.security.cert.X509CertSelector;

/**
 * a basic index for an originator.
 */
class OriginatorId
    extends X509CertSelector
{
    public int hashCode()
    {
        int code = Arrays.hashCode(this.getSubjectKeyIdentifier());

        if (this.getSerialNumber() != null)
        {
            code ^= this.getSerialNumber().hashCode();
        }

        if (this.getIssuerAsString() != null)
        {
            code ^= this.getIssuerAsString().hashCode();
        }

        return code;
    }

    public boolean equals(
        Object  o)
    {
        if (!(o instanceof OriginatorId))
        {
            return false;
        }

        OriginatorId id = (OriginatorId)o;

        return Arrays.areEqual(this.getSubjectKeyIdentifier(), id.getSubjectKeyIdentifier())
            && equalsObj(this.getSerialNumber(), id.getSerialNumber())
            && equalsObj(this.getIssuerAsString(), id.getIssuerAsString());
    }

    private boolean equalsObj(Object a, Object b)
    {
        return (a != null) ? a.equals(b) : b == null;
    }
}