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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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package org.bouncycastle.mime.smime;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.cms.CMSAlgorithm;
import org.bouncycastle.util.Strings;

class SMimeUtils
{
    private static final Map RFC5751_MICALGS;
    private static final Map RFC3851_MICALGS;
    private static final Map STANDARD_MICALGS;
    private static final Map forMic;

    private static final byte[] nl = new byte[2];


    static
    {
        nl[0] = '\r';
        nl[1] = '\n';


        Map stdMicAlgs = new HashMap();

        stdMicAlgs.put(CMSAlgorithm.MD5, "md5");
        stdMicAlgs.put(CMSAlgorithm.SHA1, "sha-1");
        stdMicAlgs.put(CMSAlgorithm.SHA224, "sha-224");
        stdMicAlgs.put(CMSAlgorithm.SHA256, "sha-256");
        stdMicAlgs.put(CMSAlgorithm.SHA384, "sha-384");
        stdMicAlgs.put(CMSAlgorithm.SHA512, "sha-512");
        stdMicAlgs.put(CMSAlgorithm.GOST3411, "gostr3411-94");
//        stdMicAlgs.put(CMSAlgorithm.GOST3411_2012_256, "gostr3411-2012-256");
//        stdMicAlgs.put(CMSAlgorithm.GOST3411_2012_512, "gostr3411-2012-512");

        RFC5751_MICALGS = Collections.unmodifiableMap(stdMicAlgs);

        Map oldMicAlgs = new HashMap();

        oldMicAlgs.put(CMSAlgorithm.MD5, "md5");
        oldMicAlgs.put(CMSAlgorithm.SHA1, "sha1");
        oldMicAlgs.put(CMSAlgorithm.SHA224, "sha224");
        oldMicAlgs.put(CMSAlgorithm.SHA256, "sha256");
        oldMicAlgs.put(CMSAlgorithm.SHA384, "sha384");
        oldMicAlgs.put(CMSAlgorithm.SHA512, "sha512");
        oldMicAlgs.put(CMSAlgorithm.GOST3411, "gostr3411-94");
//        oldMicAlgs.put(CMSAlgorithm.GOST3411_2012_256, "gostr3411-2012-256");
//        oldMicAlgs.put(CMSAlgorithm.GOST3411_2012_512, "gostr3411-2012-512");


        RFC3851_MICALGS = Collections.unmodifiableMap(oldMicAlgs);

        STANDARD_MICALGS = RFC5751_MICALGS;


        Map mic = new TreeMap(String.CASE_INSENSITIVE_ORDER);

        for (Iterator it = STANDARD_MICALGS.keySet().iterator(); it.hasNext();)
        {
            Object key = it.next();
            mic.put(STANDARD_MICALGS.get(key).toString(), (ASN1ObjectIdentifier)key);
        }

        for (Iterator it = RFC3851_MICALGS.keySet().iterator(); it.hasNext();)
        {
            Object key = it.next();
            mic.put(RFC3851_MICALGS.get(key).toString(), (ASN1ObjectIdentifier)key);
        }

        forMic = Collections.unmodifiableMap(mic);

    }

    static String lessQuotes(String in)
    {
        if (in == null || in.length() <= 1)  // make sure we have at least 2 characters
        {
            return in;
        }

        if (in.charAt(0) == '"' && in.charAt(in.length() - 1) == '"')
        {
            return in.substring(1, in.length() - 1);
        }

        return in;
    }

    static String getParameter(String startsWith, List parameters)
    {
        for (Iterator paramIt = parameters.iterator(); paramIt.hasNext(); )
        {
            String param = (String)paramIt.next();
            if (param.startsWith(startsWith))
            {
                return param;
            }
        }

        return null;
    }

    static ASN1ObjectIdentifier getDigestOID(String alg)
    {
        ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier)forMic.get(Strings.toLowerCase(alg));

        if (oid == null)
        {
            throw new IllegalArgumentException("unknown micalg passed: " + alg);
        }

        return oid;
    }

    static OutputStream createUnclosable(OutputStream destination)
    {
        return new FilterOutputStream(destination)
        {
            public void close()
                throws IOException
            {

            }
        };
    }
}