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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.cert.path;

import java.util.HashSet;
import java.util.Set;

import org.spongycastle.cert.X509CertificateHolder;

class CertPathUtils
{
    static Set getCriticalExtensionsOIDs(X509CertificateHolder[] certificates)
    {
        Set criticalExtensions = new HashSet();

        for (int i = 0; i != certificates.length; i++)
        {
            criticalExtensions.addAll(certificates[i].getCriticalExtensionOIDs());
        }

        return criticalExtensions;
    }
}