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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.openssl;

import java.io.IOException;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.DSAParameter;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.cert.X509AttributeCertificateHolder;
import org.bouncycastle.cert.X509CRLHolder;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.pkcs.PKCS10CertificationRequest;
import org.bouncycastle.pkcs.PKCS8EncryptedPrivateKeyInfo;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.io.pem.PemGenerationException;
import org.bouncycastle.util.io.pem.PemHeader;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemObjectGenerator;

/**
 * PEM generator for the original set of PEM objects used in Open SSL.
 */
public class MiscPEMGenerator
    implements PemObjectGenerator
{
    private static final ASN1ObjectIdentifier[] dsaOids =
    {
        X9ObjectIdentifiers.id_dsa,
        OIWObjectIdentifiers.dsaWithSHA1
    };

    private static final byte[] hexEncodingTable =
    {
        (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7',
        (byte)'8', (byte)'9', (byte)'A', (byte)'B', (byte)'C', (byte)'D', (byte)'E', (byte)'F'
    };

    private final Object obj;
    private final PEMEncryptor encryptor;

    public MiscPEMGenerator(Object o)
    {
        this.obj = o;              // use of this confuses some earlier JDKs.
        this.encryptor = null;
    }

    public MiscPEMGenerator(Object o, PEMEncryptor encryptor)
    {
        this.obj = o;
        this.encryptor = encryptor;
    }

    private PemObject createPemObject(Object o)
        throws IOException
    {
        String  type;
        byte[]  encoding;

        if (o instanceof PemObject)
        {
            return (PemObject)o;
        }
        if (o instanceof PemObjectGenerator)
        {
            return ((PemObjectGenerator)o).generate();
        }
        if (o instanceof X509CertificateHolder)
        {
            type = "CERTIFICATE";

            encoding = ((X509CertificateHolder)o).getEncoded();
        }
        else if (o instanceof X509CRLHolder)
        {
            type = "X509 CRL";

            encoding = ((X509CRLHolder)o).getEncoded();
        }
        else if (o instanceof X509TrustedCertificateBlock)
        {
            type = "TRUSTED CERTIFICATE";

            encoding = ((X509TrustedCertificateBlock)o).getEncoded();
        }
        else if (o instanceof PrivateKeyInfo)
        {
            PrivateKeyInfo info = (PrivateKeyInfo)o;
            ASN1ObjectIdentifier algOID = info.getPrivateKeyAlgorithm().getAlgorithm();

            if (algOID.equals(PKCSObjectIdentifiers.rsaEncryption))
            {
                type = "RSA PRIVATE KEY";

                encoding = info.parsePrivateKey().toASN1Primitive().getEncoded();
            }
            else if (algOID.equals(dsaOids[0]) || algOID.equals(dsaOids[1]))
            {
                type = "DSA PRIVATE KEY";

                DSAParameter p = DSAParameter.getInstance(info.getPrivateKeyAlgorithm().getParameters());
                ASN1EncodableVector v = new ASN1EncodableVector();

                v.add(new ASN1Integer(0));
                v.add(new ASN1Integer(p.getP()));
                v.add(new ASN1Integer(p.getQ()));
                v.add(new ASN1Integer(p.getG()));

                BigInteger x = ASN1Integer.getInstance(info.parsePrivateKey()).getValue();
                BigInteger y = p.getG().modPow(x, p.getP());

                v.add(new ASN1Integer(y));
                v.add(new ASN1Integer(x));

                encoding = new DERSequence(v).getEncoded();
            }
            else if (algOID.equals(X9ObjectIdentifiers.id_ecPublicKey))
            {
                type = "EC PRIVATE KEY";

                encoding = info.parsePrivateKey().toASN1Primitive().getEncoded();
            }
            else
            {
                type = "PRIVATE KEY";

                encoding = info.getEncoded();
            }
        }
        else if (o instanceof SubjectPublicKeyInfo)
        {
            type = "PUBLIC KEY";

            encoding = ((SubjectPublicKeyInfo)o).getEncoded();
        }
        else if (o instanceof X509AttributeCertificateHolder)
        {
            type = "ATTRIBUTE CERTIFICATE";
            encoding = ((X509AttributeCertificateHolder)o).getEncoded();
        }
        else if (o instanceof org.bouncycastle.pkcs.PKCS10CertificationRequest)
        {
            type = "CERTIFICATE REQUEST";
            encoding = ((PKCS10CertificationRequest)o).getEncoded();
        }
        else if (o instanceof PKCS8EncryptedPrivateKeyInfo)
        {
            type = "ENCRYPTED PRIVATE KEY";
            encoding = ((PKCS8EncryptedPrivateKeyInfo)o).getEncoded();
        }
        else if (o instanceof ContentInfo)
        {
            type = "PKCS7";
            encoding = ((ContentInfo)o).getEncoded();
        }
        else
        {
            throw new PemGenerationException("unknown object passed - can't encode.");
        }

        if (encryptor != null)
        {
            String dekAlgName = Strings.toUpperCase(encryptor.getAlgorithm());

            // Note: For backward compatibility
            if (dekAlgName.equals("DESEDE"))
            {
                dekAlgName = "DES-EDE3-CBC";
            }


            byte[] iv = encryptor.getIV();

            byte[] encData = encryptor.encrypt(encoding);

            List headers = new ArrayList(2);

            headers.add(new PemHeader("Proc-Type", "4,ENCRYPTED"));
            headers.add(new PemHeader("DEK-Info", dekAlgName + "," + getHexEncoded(iv)));

            return new PemObject(type, headers, encData);
        }
        return new PemObject(type, encoding);
    }

    private String getHexEncoded(byte[] bytes)
        throws IOException
    {
        char[] chars = new char[bytes.length * 2];

        for (int i = 0; i != bytes.length; i++)
        {
            int    v = bytes[i] & 0xff;

            chars[2 * i] = (char)(hexEncodingTable[(v >>> 4)]);
            chars[2 * i + 1]  = (char)(hexEncodingTable[v & 0xf]);
        }

        return new String(chars);
    }

    public PemObject generate()
        throws PemGenerationException
    {
        try
        {
            return createPemObject(obj);
        }
        catch (IOException e)
        {
            throw new PemGenerationException("encoding exception: " + e.getMessage(), e);
        }
    }
}