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The Bouncy Castle Java CMS and S/MIME APIs for handling the CMS and S/MIME protocols. This jar contains CMS and S/MIME APIs for JDK 1.6. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs. If the S/MIME API is used, the JavaMail API and the Java activation framework will also be needed.

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package org.bouncycastle.operator.bc;

import java.security.Key;

import org.bouncycastle.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");
    }
}