private static void encryptFile(
OutputStream out,
String fileName,
PGPPublicKey encKey,
boolean armor,
boolean withIntegrityCheck)
throws IOException, NoSuchProviderException {
if (armor) {
out = new ArmoredOutputStream(out);
}
try {
PGPEncryptedDataGenerator cPk =
new PGPEncryptedDataGenerator(
new JcePGPDataEncryptorBuilder(PGPEncryptedData.CAST5)
.setWithIntegrityPacket(withIntegrityCheck)
.setSecureRandom(new SecureRandom())
.setProvider("BC"));
cPk.addMethod(new JcePublicKeyKeyEncryptionMethodGenerator(encKey).setProvider("BC"));
OutputStream cOut = cPk.open(out, new byte[1 << 16]);
PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(PGPCompressedData.ZIP);
PGPUtil.writeFileToLiteralData(
comData.open(cOut), PGPLiteralData.BINARY, new File(fileName), new byte[1 << 16]);
comData.close();
cOut.close();
if (armor) {
out.close();
}
} catch (PGPException e) {
System.err.println(e);
if (e.getUnderlyingException() != null) {
e.getUnderlyingException().printStackTrace();
}
}
}
/** decrypt the passed in message stream */
private static void decryptFile(
InputStream in, InputStream keyIn, char[] passwd, String defaultFileName)
throws IOException, NoSuchProviderException {
in = PGPUtil.getDecoderStream(in);
try {
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();
}
//
// find the secret key
//
Iterator it = enc.getEncryptedDataObjects();
PGPPrivateKey sKey = null;
PGPPublicKeyEncryptedData pbe = null;
PGPSecretKeyRingCollection pgpSec =
new PGPSecretKeyRingCollection(
PGPUtil.getDecoderStream(keyIn), new JcaKeyFingerprintCalculator());
while (sKey == null && it.hasNext()) {
pbe = (PGPPublicKeyEncryptedData) it.next();
sKey = PGPExampleUtil.findSecretKey(pgpSec, pbe.getKeyID(), passwd);
}
if (sKey == null) {
throw new IllegalArgumentException("secret key for message not found.");
}
InputStream clear =
pbe.getDataStream(
new JcePublicKeyDataDecryptorFactoryBuilder().setProvider("BC").build(sKey));
JcaPGPObjectFactory plainFact = new JcaPGPObjectFactory(clear);
PGPCompressedData cData = (PGPCompressedData) plainFact.nextObject();
InputStream compressedStream = new BufferedInputStream(cData.getDataStream());
JcaPGPObjectFactory pgpFact = new JcaPGPObjectFactory(compressedStream);
Object message = pgpFact.nextObject();
if (message instanceof PGPLiteralData) {
PGPLiteralData ld = (PGPLiteralData) message;
String outFileName = ld.getFileName();
if (outFileName.length() == 0) {
outFileName = defaultFileName;
}
InputStream unc = ld.getInputStream();
OutputStream fOut = new BufferedOutputStream(new FileOutputStream(outFileName));
Streams.pipeAll(unc, fOut);
fOut.close();
} else if (message instanceof PGPOnePassSignatureList) {
throw new PGPException("encrypted message contains a signed message - not literal data.");
} else {
throw new PGPException("message is not a simple encrypted file - type unknown.");
}
if (pbe.isIntegrityProtected()) {
if (!pbe.verify()) {
System.err.println("message failed integrity check");
} else {
System.err.println("message integrity check passed");
}
} else {
System.err.println("no message integrity check");
}
} catch (PGPException e) {
System.err.println(e);
if (e.getUnderlyingException() != null) {
e.getUnderlyingException().printStackTrace();
}
}
}