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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.operator.bc;

import java.security.Key;

import org.spongycastle.operator.GenericKey;

class OperatorUtils
{
    static byte[] getKeyBytes(GenericKey key)
    {
        if (key.getRepresentation() instanceof Key)
        {
            return ((Key)key.getRepresentation()).getEncoded();
        }

        if (key.getRepresentation() instanceof byte[])
        {
            return (byte[])key.getRepresentation();
        }

        throw new IllegalArgumentException("unknown generic key type");
    }
}