org.bouncycastle.openssl.MiscPEMGenerator Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of bcpkix-jdk15on Show documentation
The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
There is a newer version: 1.70
Show newest version
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.DERInteger;
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 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 DERInteger(0));
                v.add(new DERInteger(p.getP()));
                v.add(new DERInteger(p.getQ()));
                v.add(new DERInteger(p.getG()));

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

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

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

                encoding = info.parsePrivateKey().toASN1Primitive().getEncoded();
            }
            else
            {
                throw new IOException("Cannot identify private key");
            }
        }
        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 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);
        }
    }
}