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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.cert.crmf;

import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.ExtensionsGenerator;
import org.bouncycastle.cert.CertIOException;

class CRMFUtil
{
    static void derEncodeToStream(ASN1Object obj, OutputStream stream)
    {
        try
        {
            obj.encodeTo(stream, ASN1Encoding.DER);
            stream.close();
        }
        catch (IOException e)
        {
            throw new CRMFRuntimeException("unable to DER encode object: " + e.getMessage(), e);
        }
    }

    static void addExtension(ExtensionsGenerator extGenerator, ASN1ObjectIdentifier oid, boolean isCritical, ASN1Encodable value)
        throws CertIOException
    {
        try
        {
            extGenerator.addExtension(oid, isCritical, value);
        }
        catch (IOException e)
        {
            throw new CertIOException("cannot encode extension: " + e.getMessage(), e);
        }
    }
}