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The Bouncy Castle Java API for handling the OpenPGP protocol. This jar contains the OpenPGP API 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.
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package org.bouncycastle.openpgp.examples;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Date;
import org.bouncycastle.bcpg.ArmoredOutputStream;
import org.bouncycastle.bcpg.CompressionAlgorithmTags;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openpgp.PGPCompressedData;
import org.bouncycastle.openpgp.PGPCompressedDataGenerator;
import org.bouncycastle.openpgp.PGPEncryptedDataGenerator;
import org.bouncycastle.openpgp.PGPEncryptedDataList;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPLiteralData;
import org.bouncycastle.openpgp.PGPLiteralDataGenerator;
import org.bouncycastle.openpgp.PGPPBEEncryptedData;
import org.bouncycastle.openpgp.PGPUtil;
import org.bouncycastle.openpgp.jcajce.JcaPGPObjectFactory;
import org.bouncycastle.openpgp.operator.jcajce.JcaPGPDigestCalculatorProviderBuilder;
import org.bouncycastle.openpgp.operator.jcajce.JcePBEDataDecryptorFactoryBuilder;
import org.bouncycastle.openpgp.operator.jcajce.JcePBEKeyEncryptionMethodGenerator;
import org.bouncycastle.openpgp.operator.jcajce.JcePGPDataEncryptorBuilder;
import org.bouncycastle.util.io.Streams;
/**
* Simple routine to encrypt and decrypt using a passphrase.
* This service routine provides the basic PGP services between
* byte arrays.
*
* Note: this code plays no attention to -CONSOLE in the file name
* the specification of "_CONSOLE" in the filename.
* It also expects that a single pass phrase will have been used.
*
*/
public class ByteArrayHandler
{
/**
* decrypt the passed in message stream
*
* @param encrypted The message to be decrypted.
* @param passPhrase Pass phrase (key)
*
* @return Clear text as a byte array. I18N considerations are
* not handled by this routine
* @exception IOException
* @exception PGPException
* @exception NoSuchProviderException
*/
public static byte[] decrypt(
byte[] encrypted,
char[] passPhrase)
throws IOException, PGPException, NoSuchProviderException
{
InputStream in = new ByteArrayInputStream(encrypted);
in = PGPUtil.getDecoderStream(in);
JcaPGPObjectFactory pgpF = new JcaPGPObjectFactory(in);
PGPEncryptedDataList enc;
Object o = pgpF.nextObject();
//
// the first object might be a PGP marker packet.
//
if (o instanceof PGPEncryptedDataList)
{
enc = (PGPEncryptedDataList)o;
}
else
{
enc = (PGPEncryptedDataList)pgpF.nextObject();
}
PGPPBEEncryptedData pbe = (PGPPBEEncryptedData)enc.get(0);
InputStream clear = pbe.getDataStream(new JcePBEDataDecryptorFactoryBuilder(new JcaPGPDigestCalculatorProviderBuilder().setProvider("BC").build()).setProvider("BC").build(passPhrase));
JcaPGPObjectFactory pgpFact = new JcaPGPObjectFactory(clear);
PGPCompressedData cData = (PGPCompressedData)pgpFact.nextObject();
pgpFact = new JcaPGPObjectFactory(cData.getDataStream());
PGPLiteralData ld = (PGPLiteralData)pgpFact.nextObject();
return Streams.readAll(ld.getInputStream());
}
/**
* Simple PGP encryptor between byte[].
*
* @param clearData The test to be encrypted
* @param passPhrase The pass phrase (key). This method assumes that the
* key is a simple pass phrase, and does not yet support
* RSA or more sophisiticated keying.
* @param fileName File name. This is used in the Literal Data Packet (tag 11)
* which is really inly important if the data is to be
* related to a file to be recovered later. Because this
* routine does not know the source of the information, the
* caller can set something here for file name use that
* will be carried. If this routine is being used to
* encrypt SOAP MIME bodies, for example, use the file name from the
* MIME type, if applicable. Or anything else appropriate.
*
* @param armor
*
* @return encrypted data.
* @exception IOException
* @exception PGPException
* @exception NoSuchProviderException
*/
public static byte[] encrypt(
byte[] clearData,
char[] passPhrase,
String fileName,
int algorithm,
boolean armor)
throws IOException, PGPException, NoSuchProviderException
{
if (fileName == null)
{
fileName= PGPLiteralData.CONSOLE;
}
byte[] compressedData = compress(clearData, fileName, CompressionAlgorithmTags.ZIP);
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
OutputStream out = bOut;
if (armor)
{
out = new ArmoredOutputStream(out);
}
PGPEncryptedDataGenerator encGen = new PGPEncryptedDataGenerator(new JcePGPDataEncryptorBuilder(algorithm).setSecureRandom(new SecureRandom()).setProvider("BC"));
encGen.addMethod(new JcePBEKeyEncryptionMethodGenerator(passPhrase).setProvider("BC"));
OutputStream encOut = encGen.open(out, compressedData.length);
encOut.write(compressedData);
encOut.close();
if (armor)
{
out.close();
}
return bOut.toByteArray();
}
private static byte[] compress(byte[] clearData, String fileName, int algorithm) throws IOException
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(algorithm);
OutputStream cos = comData.open(bOut); // open it with the final destination
PGPLiteralDataGenerator lData = new PGPLiteralDataGenerator();
// we want to generate compressed data. This might be a user option later,
// in which case we would pass in bOut.
OutputStream pOut = lData.open(cos, // the compressed output stream
PGPLiteralData.BINARY,
fileName, // "filename" to store
clearData.length, // length of clear data
new Date() // current time
);
pOut.write(clearData);
pOut.close();
comData.close();
return bOut.toByteArray();
}
public static void main(String[] args) throws Exception
{
Security.addProvider(new BouncyCastleProvider());
String passPhrase = "Dick Beck";
char[] passArray = passPhrase.toCharArray();
byte[] original = "Hello world".getBytes();
System.out.println("Starting PGP test");
byte[] encrypted = encrypt(original, passArray, "iway", PGPEncryptedDataGenerator.CAST5, true);
System.out.println("\nencrypted data = '"+new String(encrypted)+"'");
byte[] decrypted= decrypt(encrypted,passArray);
System.out.println("\ndecrypted data = '"+new String(decrypted)+"'");
encrypted = encrypt(original, passArray, "iway", PGPEncryptedDataGenerator.AES_256, false);
System.out.println("\nencrypted data = '"+new String(org.bouncycastle.util.encoders.Hex.encode(encrypted))+"'");
decrypted= decrypt(encrypted, passArray);
System.out.println("\ndecrypted data = '"+new String(decrypted)+"'");
}
}