org.bouncycastle.openpgp.PGPCompressedDataGenerator Java Examples

public static byte[] encrypt( final byte[] message, final PGPPublicKey publicKey, boolean armored )
        throws PGPException
{
    try
    {
        final ByteArrayInputStream in = new ByteArrayInputStream( message );
        final ByteArrayOutputStream bOut = new ByteArrayOutputStream();
        final PGPLiteralDataGenerator literal = new PGPLiteralDataGenerator();
        final PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator( CompressionAlgorithmTags.ZIP );
        final OutputStream pOut =
                literal.open( comData.open( bOut ), PGPLiteralData.BINARY, "filename", in.available(), new Date() );
        Streams.pipeAll( in, pOut );
        comData.close();
        final byte[] bytes = bOut.toByteArray();
        final PGPEncryptedDataGenerator generator = new PGPEncryptedDataGenerator(
                new JcePGPDataEncryptorBuilder( SymmetricKeyAlgorithmTags.AES_256 ).setWithIntegrityPacket( true )
                                                                                   .setSecureRandom(
                                                                                           new SecureRandom() )

                                                                                   .setProvider( provider ) );
        generator.addMethod( new JcePublicKeyKeyEncryptionMethodGenerator( publicKey ).setProvider( provider ) );
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        OutputStream theOut = armored ? new ArmoredOutputStream( out ) : out;
        OutputStream cOut = generator.open( theOut, bytes.length );
        cOut.write( bytes );
        cOut.close();
        theOut.close();
        return out.toByteArray();
    }
    catch ( Exception e )
    {
        throw new PGPException( "Error in encrypt", e );
    }
}
 

@Test
public void testCompressDecompress() throws Exception {
  // Compress the data and write out a compressed data OpenPGP message.
  byte[] data;
  try (ByteArrayOutputStream output = new ByteArrayOutputStream()) {
    PGPCompressedDataGenerator kompressor = new PGPCompressedDataGenerator(ZIP);
    try (OutputStream output2 = kompressor.open(output)) {
      output2.write(FALL_OF_HYPERION_A_DREAM.getBytes(UTF_8));
    }
    data = output.toByteArray();
  }
  logger.atInfo().log("Compressed data: %s", dumpHex(data));

  // Decompress the data.
  try (ByteArrayInputStream input = new ByteArrayInputStream(data)) {
    PGPObjectFactory pgpFact = new BcPGPObjectFactory(input);
    PGPCompressedData object = (PGPCompressedData) pgpFact.nextObject();
    InputStream original = object.getDataStream();  // Closing this would close input.
    assertThat(CharStreams.toString(new InputStreamReader(original, UTF_8)))
        .isEqualTo(FALL_OF_HYPERION_A_DREAM);
    assertThat(pgpFact.nextObject()).isNull();
  }
}
 

private static void doEncryptFile(InputStream pIn, SourceInfo encryptionSourceInfo, OutputStream out,
		PGPEncryptedDataGenerator encDataGen, Updater progress, char outputType)
		throws IOException, NoSuchProviderException, PGPException, UserRequestedCancellationException {
	OutputStream encryptedStream = encDataGen.open(out, new byte[BUFFER_SIZE]);
	PGPCompressedDataGenerator compressedDataGen = new PGPCompressedDataGenerator(PGPCompressedData.ZIP);
	OutputStream compressedStream = compressedDataGen.open(encryptedStream);
	estimateFullOperationSize(encryptionSourceInfo, progress);
	writeFileToLiteralData(pIn, encryptionSourceInfo, compressedStream, outputType, new byte[BUFFER_SIZE],
			progress);
	compressedDataGen.close();
	encryptedStream.close();
}
 

/**
 * Wraps with stream that outputs compressed data packet.
 */
protected OutputStream compress(OutputStream out, FileMetadata meta)
        throws IOException, PGPException {
    CompressionAlgorithm compAlgo = getCompressionAlgorithm();
    int compLevel = getCompressionLevel();
    log.trace("using compression algorithm {} - {}", compAlgo, compLevel);

    if (compAlgo == CompressionAlgorithm.Uncompressed ||
            compLevel < 1 || compLevel > 9)
        return null;

    byte[] buf = getCompressionBuffer(meta);
    return new PGPCompressedDataGenerator(compAlgo.ordinal(), compLevel).open(out, buf);
}
 

public static byte[] signAndEncrypt( final byte[] message, final PGPSecretKey secretKey, final String secretPwd,
                                     final PGPPublicKey publicKey, final boolean armored ) throws PGPException
{
    try
    {
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        final PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator(
                new JcePGPDataEncryptorBuilder( SymmetricKeyAlgorithmTags.AES_256 ).setWithIntegrityPacket( true )
                                                                                   .setSecureRandom(
                                                                                           new SecureRandom() )
                                                                                   .setProvider( provider ) );

        encryptedDataGenerator.addMethod(
                new JcePublicKeyKeyEncryptionMethodGenerator( publicKey ).setSecureRandom( new SecureRandom() )
                                                                         .setProvider( provider ) );

        final OutputStream theOut = armored ? new ArmoredOutputStream( out ) : out;
        final OutputStream encryptedOut = encryptedDataGenerator.open( theOut, new byte[4096] );

        final PGPCompressedDataGenerator compressedDataGenerator =
                new PGPCompressedDataGenerator( CompressionAlgorithmTags.ZIP );
        final OutputStream compressedOut = compressedDataGenerator.open( encryptedOut, new byte[4096] );
        final PGPPrivateKey privateKey = secretKey.extractPrivateKey(
                new JcePBESecretKeyDecryptorBuilder().setProvider( provider ).build( secretPwd.toCharArray() ) );
        final PGPSignatureGenerator signatureGenerator = new PGPSignatureGenerator(
                new JcaPGPContentSignerBuilder( secretKey.getPublicKey().getAlgorithm(), HashAlgorithmTags.SHA1 )
                        .setProvider( provider ) );
        signatureGenerator.init( PGPSignature.BINARY_DOCUMENT, privateKey );
        final Iterator<?> it = secretKey.getPublicKey().getUserIDs();
        if ( it.hasNext() )
        {
            final PGPSignatureSubpacketGenerator spGen = new PGPSignatureSubpacketGenerator();
            spGen.setSignerUserID( false, ( String ) it.next() );
            signatureGenerator.setHashedSubpackets( spGen.generate() );
        }
        signatureGenerator.generateOnePassVersion( false ).encode( compressedOut );
        final PGPLiteralDataGenerator literalDataGenerator = new PGPLiteralDataGenerator();
        final OutputStream literalOut = literalDataGenerator
                .open( compressedOut, PGPLiteralData.BINARY, "filename", new Date(), new byte[4096] );
        final InputStream in = new ByteArrayInputStream( message );
        final byte[] buf = new byte[4096];
        for ( int len; ( len = in.read( buf ) ) > 0; )
        {
            literalOut.write( buf, 0, len );
            signatureGenerator.update( buf, 0, len );
        }
        in.close();
        literalDataGenerator.close();
        signatureGenerator.generate().encode( compressedOut );
        compressedDataGenerator.close();
        encryptedDataGenerator.close();
        theOut.close();
        return out.toByteArray();
    }
    catch ( Exception e )
    {
        throw new PGPException( "Error in signAndEncrypt", e );
    }
}
 

/**
 * Creates an OutputStream that compresses the data.
 *
 * <p>TODO(b/110465964): document where the input comes from / output goes to. Something like
 * documenting that os is the result of openEncryptor and the result goes into openFileEncoder.
 */
@CheckReturnValue
static ImprovedOutputStream openCompressor(@WillNotClose OutputStream os) {
  try {
    return new ImprovedOutputStream(
        "RydeCompressor",
        new PGPCompressedDataGenerator(COMPRESSION_ALGORITHM).open(os, new byte[BUFFER_SIZE]));
  } catch (IOException | PGPException e) {
    throw new RuntimeException(e);
  }
}
 

public PGPEncryptionUtil(PGPPublicKey key, String payloadFilename, OutputStream out) throws PGPException, NoSuchProviderException, IOException {
    BcPGPDataEncryptorBuilder builder = new BcPGPDataEncryptorBuilder(payloadEncryptAlg);
    builder.setSecureRandom(new SecureRandom());
    // create an encrypted payload and set the public key on the data
    // generator
    PGPEncryptedDataGenerator encryptGen = new PGPEncryptedDataGenerator(builder, supportPGP2_6);

    encryptGen.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(key));

    // open an output stream connected to the encrypted data generator
    // and have the generator write its data out to the ascii-encoding
    // stream
    byte[] buffer = new byte[BUFFER_SIZE];
    // write data out using "ascii-armor" encoding if enabled - this is the normal PGP text output.
    encryptedOut = encryptGen.open(isArmor ? new ArmoredOutputStream(out) : out, buffer);

    // add a data compressor if compression is enabled else just write the encrypted stream to the literal
    PGPLiteralDataGenerator literalGen = new PGPLiteralDataGenerator();
    if (isCompressData) {
        // compress data. before encryption ... far better compression on unencrypted data.
        PGPCompressedDataGenerator compressor = new PGPCompressedDataGenerator(PGPCompressedData.ZIP);
        compressedOut = compressor.open(encryptedOut);
        literalOut = literalGen.open(compressedOut, PGPLiteralDataGenerator.UTF8, payloadFilename, new Date(), new byte[BUFFER_SIZE]);
    } else {
        literalOut = literalGen.open(encryptedOut, PGPLiteralDataGenerator.UTF8, payloadFilename, new Date(), new byte[BUFFER_SIZE]);
    }
}
 

public static byte[] sign( byte data[], PGPPrivateKey privateKey ) throws IOException, PGPException
{
    ByteArrayOutputStream bos = new ByteArrayOutputStream();

    ArmoredOutputStream aos = new ArmoredOutputStream( bos );

    PGPCompressedDataGenerator compressGen = new PGPCompressedDataGenerator( PGPCompressedData.ZLIB );

    BCPGOutputStream bcOut = new BCPGOutputStream( compressGen.open( aos ) );

    PGPSignatureGenerator signGen = getSignatureGenerator( privateKey, bcOut );

    produceSign( data, bcOut, signGen );

    compressGen.close();

    aos.close();

    return bos.toByteArray();
}
 

private static byte[] compress( byte data[] ) throws IOException
{
    PGPCompressedDataGenerator compressGen = new PGPCompressedDataGenerator( CompressionAlgorithmTags.ZIP );

    ByteArrayOutputStream bos = new ByteArrayOutputStream();

    OutputStream compressOut = compressGen.open( bos );

    OutputStream os =
            new PGPLiteralDataGenerator().open( compressOut, PGPLiteralData.BINARY, "", data.length, new Date() );

    os.write( data );

    os.close();

    compressGen.close();

    return bos.toByteArray();
}
 

public static byte[] sign( byte[] message, PGPSecretKey secretKey, String secretPwd, boolean armor )
        throws PGPException
{
    try
    {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        OutputStream theOut = armor ? new ArmoredOutputStream( out ) : out;

        PGPPrivateKey pgpPrivKey = secretKey.extractPrivateKey(
                new JcePBESecretKeyDecryptorBuilder().setProvider( provider ).build( secretPwd.toCharArray() ) );
        PGPSignatureGenerator sGen = new PGPSignatureGenerator(
                new JcaPGPContentSignerBuilder( secretKey.getPublicKey().getAlgorithm(), PGPUtil.SHA1 )
                        .setProvider( provider ) );

        sGen.init( PGPSignature.BINARY_DOCUMENT, pgpPrivKey );

        Iterator it = secretKey.getPublicKey().getUserIDs();
        if ( it.hasNext() )
        {
            PGPSignatureSubpacketGenerator spGen = new PGPSignatureSubpacketGenerator();

            spGen.setSignerUserID( false, ( String ) it.next() );
            sGen.setHashedSubpackets( spGen.generate() );
        }

        PGPCompressedDataGenerator cGen = new PGPCompressedDataGenerator( PGPCompressedData.ZLIB );

        BCPGOutputStream bOut = new BCPGOutputStream( cGen.open( theOut ) );

        sGen.generateOnePassVersion( false ).encode( bOut );

        PGPLiteralDataGenerator lGen = new PGPLiteralDataGenerator();
        OutputStream lOut =
                lGen.open( bOut, PGPLiteralData.BINARY, "filename", new Date(), new byte[4096] );         //
        InputStream fIn = new ByteArrayInputStream( message );
        int ch;

        while ( ( ch = fIn.read() ) >= 0 )
        {
            lOut.write( ch );
            sGen.update( ( byte ) ch );
        }

        lGen.close();

        sGen.generate().encode( bOut );

        cGen.close();

        theOut.close();

        return out.toByteArray();
    }
    catch ( Exception e )
    {
        throw new PGPException( "Error in sign", e );
    }
}
 

/**
 * Encrypt, sign and write input stream data to output stream.
 * Input and output stream are closed.
 */
private static void encryptAndSign(
        InputStream plainInput, OutputStream encryptedOutput,
        PersonalKey myKey, List<PGPUtils.PGPCoderKey> receiverKeys)
        throws IOException, PGPException {

    // setup data encryptor & generator
    BcPGPDataEncryptorBuilder encryptor = new BcPGPDataEncryptorBuilder(PGPEncryptedData.AES_192);
    encryptor.setWithIntegrityPacket(true);
    encryptor.setSecureRandom(new SecureRandom());

    // add public key recipients
    PGPEncryptedDataGenerator encGen = new PGPEncryptedDataGenerator(encryptor);
    receiverKeys.forEach(key ->
        encGen.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(key.encryptKey)));

    OutputStream encryptedOut = encGen.open(encryptedOutput, new byte[BUFFER_SIZE]);

    // setup compressed data generator
    PGPCompressedDataGenerator compGen = new PGPCompressedDataGenerator(PGPCompressedData.ZIP);
    OutputStream compressedOut = compGen.open(encryptedOut, new byte[BUFFER_SIZE]);

    // setup signature generator
    int algo = myKey.getSigningAlgorithm();
    PGPSignatureGenerator sigGen = new PGPSignatureGenerator(
            new BcPGPContentSignerBuilder(algo, HashAlgorithmTags.SHA256));
    sigGen.init(PGPSignature.BINARY_DOCUMENT, myKey.getPrivateSigningKey());

    PGPSignatureSubpacketGenerator spGen = new PGPSignatureSubpacketGenerator();
    spGen.setSignerUserID(false, myKey.getUserId());
    sigGen.setUnhashedSubpackets(spGen.generate());

    sigGen.generateOnePassVersion(false).encode(compressedOut);

    // Initialize literal data generator
    PGPLiteralDataGenerator literalGen = new PGPLiteralDataGenerator();
    OutputStream literalOut = literalGen.open(
        compressedOut,
        PGPLiteralData.BINARY,
        "",
        new Date(),
        new byte[BUFFER_SIZE]);

    // read the "in" stream, compress, encrypt and write to the "out" stream
    // this must be done if clear data is bigger than the buffer size
    // but there are other ways to optimize...
    byte[] buf = new byte[BUFFER_SIZE];
    int len;
    while ((len = plainInput.read(buf)) > 0) {
        literalOut.write(buf, 0, len);
        sigGen.update(buf, 0, len);
    }

    literalGen.close();

    // generate the signature, compress, encrypt and write to the "out" stream
    sigGen.generate().encode(compressedOut);
    compGen.close();
    encGen.close();
}