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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.tsp.cms;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1String;
import org.bouncycastle.asn1.cms.Attributes;
import org.bouncycastle.asn1.cms.MetaData;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.operator.DigestCalculator;

class MetaDataUtil
{
    private final MetaData          metaData;

    MetaDataUtil(MetaData metaData)
    {
        this.metaData = metaData;
    }

    void initialiseMessageImprintDigestCalculator(DigestCalculator calculator)
        throws CMSException
    {
        if (metaData != null && metaData.isHashProtected())
        {
            try
            {
                calculator.getOutputStream().write(metaData.getEncoded(ASN1Encoding.DER));
            }
            catch (IOException e)
            {
                throw new CMSException("unable to initialise calculator from metaData: " + e.getMessage(), e);
            }
        }
    }

    String getFileName()
    {
        if (metaData != null)
        {
            return convertString(metaData.getFileNameUTF8());
        }

        return null;
    }

    String getMediaType()
    {
        if (metaData != null)
        {
            return convertString(metaData.getMediaTypeIA5());
        }

        return null;
    }

    Attributes getOtherMetaData()
    {
        if (metaData != null)
        {
            return metaData.getOtherMetaData();
        }

        return null;
    }

    private String convertString(ASN1String s)
    {
        if (s != null)
        {
            return s.toString();
        }

        return null;
    }
}