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import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Iterator;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.log4j.Logger;
import org.bouncycastle.bcpg.ArmoredOutputStream;
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.PGPObjectFactory;
import org.bouncycastle.openpgp.PGPOnePassSignatureList;
import org.bouncycastle.openpgp.PGPPrivateKey;
import org.bouncycastle.openpgp.PGPPublicKey;
import org.bouncycastle.openpgp.PGPPublicKeyEncryptedData;
import org.bouncycastle.openpgp.PGPPublicKeyRing;
import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
import org.bouncycastle.openpgp.PGPSecretKey;
import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
import org.bouncycastle.openpgp.PGPUtil;
public class PGPCryptography {
static private final Logger logger = Logger.getLogger(PGPCryptography.class);
static {
Security.addProvider(new BouncyCastleProvider());
}
public PGPCryptography() throws Exception {
}
public void listPublicKeys(File publicKeyFile) throws Exception{
if(publicKeyFile == null || !publicKeyFile.exists()){
throw new IllegalArgumentException("publicKeyFile cannot be null and must be an existing file");
}
try {
InputStream in = new FileInputStream(publicKeyFile);
PGPPublicKeyRing publicKeyRing = new PGPPublicKeyRing(in);
Iterator it = publicKeyRing.getPublicKeys();
while(it.hasNext()){
PGPPublicKey k = (PGPPublicKey) it.next();
ToStringBuilder b = new ToStringBuilder(k);
b.append("isMasterKey", k.isMasterKey());
b.append("isEncryptionKey", k.isEncryptionKey());
b.append("isRevoked", k.isRevoked());
String userids = "";
Iterator useridIt = k.getUserIDs();
while(useridIt.hasNext()){
String uid = (String) useridIt.next();
if(userids.length() > 0){
userids += ", ";
}
userids += uid;
}
b.append("userids", userids);
logger.info(b);
}
} catch (Throwable e) {
throw new Exception(e);
}
}
public File encrypt(File publicKeyFile, String userid, File sourceFile) throws Exception {
if(publicKeyFile == null || !publicKeyFile.exists()){
throw new IllegalArgumentException("publicKeyFile cannot be null and must be an existing file");
}
if(sourceFile == null || !sourceFile.exists()){
throw new IllegalArgumentException("sourceFile cannot be null and must be an existing file");
}
logger.debug("About to encrypt content of file: " + sourceFile.getName());
try {
File encryptedFile = File.createTempFile("pgp_", ".encrypted", new File("C:\\pgp\\decryptedfile\\"));
FileOutputStream fileOut = new FileOutputStream(encryptedFile);
PGPPublicKey publicKey = findPublicKey(publicKeyFile, userid, true);
if(publicKey == null){
throw new IllegalArgumentException("no public key for " + userid + " in keyring " + publicKeyFile);
}
ArmoredOutputStream armoredOut = new ArmoredOutputStream(fileOut);
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
PGPCompressedDataGenerator compressedData = new PGPCompressedDataGenerator(PGPCompressedDataGenerator.ZIP);
PGPUtil.writeFileToLiteralData(compressedData.open(byteArrayOut), PGPLiteralData.BINARY, sourceFile);
compressedData.close();
PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator(PGPEncryptedDataGenerator.CAST5, new SecureRandom(), "BC");
encryptedDataGenerator.addMethod(publicKey);
byte[] bytes = byteArrayOut.toByteArray();
OutputStream encryptedOut = encryptedDataGenerator.open(armoredOut, bytes.length);
encryptedOut.write(bytes);
encryptedDataGenerator.close();
armoredOut.close();
fileOut.close();
logger.debug("file was encrypted : " + sourceFile.getName());
return encryptedFile;
} catch (Exception e) {
logger.error("Encrypt exception ", e);
throw new Exception(e);
}
}
public File decrypt(File privateKeyFile, String privateKeyPassword, File encryptedFile) throws Exception {
File decryptedFile = null;
if(privateKeyFile == null || !privateKeyFile.exists()){
throw new IllegalArgumentException("privateKeyFile cannot be null and must be an existing file");
}
if(encryptedFile == null || !encryptedFile.exists()){
throw new IllegalArgumentException("encryptedFile cannot be null and must be an existing file");
}
try {
InputStream encryptedFileIn = new FileInputStream(encryptedFile);
InputStream privateKeyIn = new FileInputStream(privateKeyFile);
decryptedFile = File.createTempFile("pgp_", ".decrypted");
logger.debug("About to decrypt content of file: " + decryptedFile.getName());
FileOutputStream out = new FileOutputStream(decryptedFile);
logger.debug("decrypting content of " + encryptedFile.getName() + " to " + decryptedFile.getName());
encryptedFileIn = PGPUtil.getDecoderStream(encryptedFileIn);
PGPObjectFactory pgpObjectFactory = new PGPObjectFactory(encryptedFileIn);
PGPEncryptedDataList encryptedDataList;
Object pgpObject = pgpObjectFactory.nextObject();
if (pgpObject instanceof PGPEncryptedDataList) {
encryptedDataList = (PGPEncryptedDataList) pgpObject;
} else {
encryptedDataList = (PGPEncryptedDataList) pgpObjectFactory.nextObject();
}
Iterator encryptedDataListIt = encryptedDataList.getEncryptedDataObjects();
PGPPrivateKey privateKey = null;
PGPPublicKeyEncryptedData privateKeyEncryptedData = null;
while (privateKey == null && encryptedDataListIt.hasNext()) {
privateKeyEncryptedData = (PGPPublicKeyEncryptedData) encryptedDataListIt.next();
privateKey = findSecretKey(privateKeyIn, privateKeyEncryptedData.getKeyID(), privateKeyPassword.toCharArray());
}
if (privateKey == null){
encryptedFileIn.close();
privateKeyIn.close();
throw new IllegalStateException("no private key could be found");
}
InputStream clear = privateKeyEncryptedData.getDataStream(privateKey, "BC");
PGPObjectFactory plainFact = new PGPObjectFactory(clear);
Object thing = plainFact.nextObject();
Object message = null;
if (thing instanceof PGPLiteralData) {
message = thing;
} else if (thing instanceof PGPCompressedData) {
PGPCompressedData cData = (PGPCompressedData) thing;
InputStream compressedStream = new BufferedInputStream(cData.getDataStream());
PGPObjectFactory pgpFact = new PGPObjectFactory(compressedStream);
message = pgpFact.nextObject();
if (message instanceof PGPOnePassSignatureList) {
message = pgpFact.nextObject();
}
}
if (message instanceof PGPLiteralData) {
// decrypt as normal
PGPLiteralData literal = (PGPLiteralData) message;
BufferedReader w = new BufferedReader(new InputStreamReader(literal.getInputStream()));
String s = null;
while((s = w.readLine()) != null){
//logger.debug("decrypted: " + s);
out.write(s.getBytes());
}
} else {
logger.error("message type " + message.toString() + " not supported.");
return null;
}
if (privateKeyEncryptedData.isIntegrityProtected()) {
if (!privateKeyEncryptedData.verify()) {
logger.error("message failed integrity check");
return null;
}
}
out.close();
encryptedFileIn.close();
privateKeyIn.close();
return decryptedFile;
} catch (Exception e) {
if(decryptedFile != null){
decryptedFile.delete();
}
logger.error("An error occured during PGP decryption: \n", e);
throw new Exception(e);
}
}
public PGPPublicKey findPublicKey(File publicKeyFile, String userid, boolean encryption) throws IOException, PGPException {
PGPPublicKeyRingCollection publicKeyRingCollection = new PGPPublicKeyRingCollection(PGPUtil.getDecoderStream(new FileInputStream(publicKeyFile)));
Iterator keyRingIt = publicKeyRingCollection.getKeyRings();
while (keyRingIt.hasNext()) {
PGPPublicKeyRing keyRing = (PGPPublicKeyRing) keyRingIt.next();
Iterator keysIt = keyRing.getPublicKeys();
while (keysIt.hasNext()) {
PGPPublicKey key = (PGPPublicKey) keysIt.next();
Iterator userIt = key.getUserIDs();
while(userIt.hasNext()){
String user = (String) userIt.next();
if(user.equalsIgnoreCase(userid) && key.isEncryptionKey() == encryption){
return key;
}
}
}
}
return null;
}
private PGPPrivateKey findSecretKey(InputStream privateKeyIn, long privateKeyID, char[] password) throws IOException, PGPException, NoSuchProviderException {
PGPSecretKeyRingCollection secretKeyRingCollection = new PGPSecretKeyRingCollection(PGPUtil.getDecoderStream(privateKeyIn));
PGPSecretKey secretKey = secretKeyRingCollection.getSecretKey(privateKeyID);
if (secretKey == null) {
return null;
}
return secretKey.extractPrivateKey(password, "BC");
}
} |
