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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 can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
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package org.bouncycastle.mime.smime;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
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 InputStream autoBuffer(InputStream input)
    {
        if (input instanceof java.io.FileInputStream)
        {
            return new BufferedInputStream(input);
        }

        return input;
    }

    static OutputStream autoBuffer(OutputStream output)
    {
        if (output instanceof java.io.FileOutputStream)
        {
            return new BufferedOutputStream(output);
        }

        return output;
    }

    static OutputStream createUnclosable(OutputStream destination)
    {
        return new FilterOutputStream(destination)
        {
            public void write(byte buf[], int off, int len)
                throws IOException
            {
                if (buf == null)
                {
                    throw new NullPointerException();
                }
                if ((off | len | (buf.length - (len + off)) | (off + len)) < 0)
                {
                    throw new IndexOutOfBoundsException();
                }
                out.write(buf, off, len);
            }

            public void close()
                throws IOException
            {

            }
        };
    }
}