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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.6.
package org.bouncycastle.openssl;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.pkcs.RSAPrivateKeyStructure;
import org.bouncycastle.asn1.x509.DSAParameter;
import org.bouncycastle.jce.PKCS10CertificationRequest;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.encoders.Base64;
import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.x509.X509AttributeCertificate;
import org.bouncycastle.x509.X509V2AttributeCertificate;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.Writer;
import java.math.BigInteger;
import java.security.Key;
import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.cert.CRLException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509CRL;
import java.security.cert.X509Certificate;
import java.security.interfaces.DSAParams;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.RSAPrivateCrtKey;
import java.security.interfaces.RSAPrivateKey;
/**
* General purpose writer for OpenSSL PEM objects.
*/
public class PEMWriter
extends BufferedWriter
{
private String provider;
/**
* Base constructor.
*
* @param out output stream to use.
*/
public PEMWriter(Writer out)
{
this(out, "BC");
}
public PEMWriter(
Writer out,
String provider)
{
super(out);
this.provider = provider;
}
private void writeHexEncoded(byte[] bytes)
throws IOException
{
bytes = Hex.encode(bytes);
for (int i = 0; i != bytes.length; i++)
{
this.write((char)bytes[i]);
}
}
private void writeEncoded(byte[] bytes)
throws IOException
{
char[] buf = new char[64];
bytes = Base64.encode(bytes);
for (int i = 0; i < bytes.length; i += buf.length)
{
int index = 0;
while (index != buf.length)
{
if ((i + index) >= bytes.length)
{
break;
}
buf[index] = (char)bytes[i + index];
index++;
}
this.write(buf, 0, index);
this.newLine();
}
}
public void writeObject(
Object o)
throws IOException
{
String type;
byte[] encoding;
if (o instanceof X509Certificate)
{
type = "CERTIFICATE";
try
{
encoding = ((X509Certificate)o).getEncoded();
}
catch (CertificateEncodingException e)
{
throw new IOException("Cannot encode object: " + e.toString());
}
}
else if (o instanceof X509CRL)
{
type = "X509 CRL";
try
{
encoding = ((X509CRL)o).getEncoded();
}
catch (CRLException e)
{
throw new IOException("Cannot encode object: " + e.toString());
}
}
else if (o instanceof KeyPair)
{
writeObject(((KeyPair)o).getPrivate());
return;
}
else if (o instanceof PrivateKey)
{
PrivateKeyInfo info = new PrivateKeyInfo(
(ASN1Sequence) ASN1Object.fromByteArray(((Key)o).getEncoded()));
if (o instanceof RSAPrivateKey)
{
type = "RSA PRIVATE KEY";
encoding = info.getPrivateKey().getEncoded();
}
else if (o instanceof DSAPrivateKey)
{
type = "DSA PRIVATE KEY";
DSAParameter p = DSAParameter.getInstance(info.getAlgorithmId().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 = ((DSAPrivateKey)o).getX();
BigInteger y = p.getG().modPow(x, p.getP());
v.add(new DERInteger(y));
v.add(new DERInteger(x));
encoding = new DERSequence(v).getEncoded();
}
else
{
throw new IOException("Cannot identify private key");
}
}
else if (o instanceof PublicKey)
{
type = "PUBLIC KEY";
encoding = ((PublicKey)o).getEncoded();
}
else if (o instanceof X509AttributeCertificate)
{
type = "ATTRIBUTE CERTIFICATE";
encoding = ((X509V2AttributeCertificate)o).getEncoded();
}
else if (o instanceof PKCS10CertificationRequest)
{
type = "CERTIFICATE REQUEST";
encoding = ((PKCS10CertificationRequest)o).getEncoded();
}
else if (o instanceof ContentInfo)
{
type = "PKCS7";
encoding = ((ContentInfo)o).getEncoded();
}
else
{
throw new IOException("unknown object passed - can't encode.");
}
writeHeader(type);
writeEncoded(encoding);
writeFooter(type);
}
public void writeObject(
Object obj,
String algorithm,
char[] password,
SecureRandom random)
throws IOException
{
if (obj instanceof KeyPair)
{
writeObject(((KeyPair)obj).getPrivate());
return;
}
String type = null;
byte[] keyData = null;
if (obj instanceof RSAPrivateCrtKey)
{
type = "RSA PRIVATE KEY";
RSAPrivateCrtKey k = (RSAPrivateCrtKey)obj;
RSAPrivateKeyStructure keyStruct = new RSAPrivateKeyStructure(
k.getModulus(),
k.getPublicExponent(),
k.getPrivateExponent(),
k.getPrimeP(),
k.getPrimeQ(),
k.getPrimeExponentP(),
k.getPrimeExponentQ(),
k.getCrtCoefficient());
// convert to bytearray
keyData = keyStruct.getEncoded();
}
else if (obj instanceof DSAPrivateKey)
{
type = "DSA PRIVATE KEY";
DSAPrivateKey k = (DSAPrivateKey)obj;
DSAParams p = k.getParams();
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 = k.getX();
BigInteger y = p.getG().modPow(x, p.getP());
v.add(new DERInteger(y));
v.add(new DERInteger(x));
keyData = new DERSequence(v).getEncoded();
}
if (type == null || keyData == null)
{
// TODO Support other types?
throw new IllegalArgumentException("Object type not supported: " + obj.getClass().getName());
}
String dekAlgName = Strings.toUpperCase(algorithm);
// Note: For backward compatibility
if (dekAlgName.equals("DESEDE"))
{
dekAlgName = "DES-EDE3-CBC";
}
int ivLength = dekAlgName.startsWith("AES-") ? 16 : 8;
byte[] iv = new byte[ivLength];
random.nextBytes(iv);
byte[] encData = PEMUtilities.crypt(true, provider, keyData, password, dekAlgName, iv);
// write the data
writeHeader(type);
this.write("Proc-Type: 4,ENCRYPTED");
this.newLine();
this.write("DEK-Info: " + dekAlgName + ",");
this.writeHexEncoded(iv);
this.newLine();
this.newLine();
this.writeEncoded(encData);
writeFooter(type);
}
private void writeHeader(
String type)
throws IOException
{
this.write("-----BEGIN " + type + "-----");
this.newLine();
}
private void writeFooter(
String type)
throws IOException
{
this.write("-----END " + type + "-----");
this.newLine();
}
}