org.bouncycastle.openpgp.PGPLiteralDataGenerator 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 );
    }
}
 

private static void produceSign( byte[] data, BCPGOutputStream bcOut, PGPSignatureGenerator signGen )
        throws IOException, PGPException
{
    PGPLiteralDataGenerator literalGen = new PGPLiteralDataGenerator();

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

    InputStream is = new ByteArrayInputStream( data );

    int ch;

    while ( ( ch = is.read() ) >= 0 )
    {
        signGen.update( ( byte ) ch );
        os.write( ch );
    }

    literalGen.close();

    signGen.generate().encode( bcOut );
}
 

/**
 * Taking in an input {@link OutputStream} and a passPhrase, return an {@link OutputStream} that can be used to output
 * encrypted output to the input {@link OutputStream}.
 * @param outputStream the output stream to hold the ciphertext {@link OutputStream}
 * @param passPhrase pass phrase
 * @param cipher the symmetric cipher to use for encryption. If null or empty then a default cipher is used.
 * @return {@link OutputStream} to write content to for encryption
 * @throws IOException
 */
public OutputStream encryptFile(OutputStream outputStream, String passPhrase, String cipher) throws IOException {
  try {
    if (Security.getProvider(PROVIDER_NAME) == null) {
      Security.addProvider(new BouncyCastleProvider());
    }

    PGPEncryptedDataGenerator cPk = new PGPEncryptedDataGenerator(
        new JcePGPDataEncryptorBuilder(symmetricKeyAlgorithmNameToTag(cipher))
            .setSecureRandom(new SecureRandom())
            .setProvider(PROVIDER_NAME));
    cPk.addMethod(new JcePBEKeyEncryptionMethodGenerator(passPhrase.toCharArray()).setProvider(PROVIDER_NAME));

    OutputStream cOut = cPk.open(outputStream, new byte[BUFFER_SIZE]);

    PGPLiteralDataGenerator literalGen = new PGPLiteralDataGenerator();
    OutputStream _literalOut =
        literalGen.open(cOut, PGPLiteralDataGenerator.BINARY, PAYLOAD_NAME, new Date(), new byte[BUFFER_SIZE]);

    return new ClosingWrapperOutputStream(_literalOut, cOut, outputStream);
  } catch (PGPException e) {
    throw new IOException(e);
  }
}
 

public static void writeFileToLiteralData(InputStream pIn, SourceInfo encryptionSourceInfo, OutputStream out,
		char fileType, byte[] buffer, Updater progress) throws IOException, UserRequestedCancellationException {
	PGPLiteralDataGenerator lData = new PGPLiteralDataGenerator();
	OutputStream pOut = lData.open(out, fileType, encryptionSourceInfo.getName(),
			new Date(encryptionSourceInfo.getModifiedAt()), buffer);
	if (progress != null) {
		progress.updateStepInfo("encryption.progress.encryptingFile", encryptionSourceInfo.getName());
	}
	pipeStream(pIn, pOut, buffer.length, progress, null);
	pOut.close();
}
 

/**
 * Wraps with stream that ouputs literal data packet.
 */
protected OutputStream packet(OutputStream out, FileMetadata meta)
        throws IOException, PGPException {
    Format fmt = meta.getFormat();
    char format = fmt.getCode();
    String name = meta.getName();
    Date date = meta.getLastModifiedDate();
    byte[] buf = getLiteralBuffer(meta);
    return new PGPLiteralDataGenerator().open(out, format, name, date, 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 encodes the data as a PGP file blob.
 *
 * <p>TODO(b/110465964): document where the input comes from / output goes to. Something like
 * documenting that os is the result of openCompressor and the result is used for the actual file
 * data (Ghostryde) / goes in to openTarEncoder (RyDE).
 *
 * @param os where to write the file blob. Is not closed by this object.
 * @param filename the filename to set in the file's metadata.
 * @param modified the modification time to set in the file's metadata.
 */
@CheckReturnValue
static ImprovedOutputStream openPgpFileWriter(
    @WillNotClose OutputStream os, String filename, DateTime modified) {
  try {
    return new ImprovedOutputStream(
        "PgpFileWriter",
        new PGPLiteralDataGenerator()
            .open(os, BINARY, filename, modified.toDate(), new byte[BUFFER_SIZE]));
  } catch (IOException 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]);
    }
}
 

/**
 * Taking in an input {@link OutputStream}, keyring inputstream and a passPhrase, generate an encrypted {@link OutputStream}.
 * @param outputStream {@link OutputStream} that will receive the encrypted content
 * @param keyIn keyring inputstream. This InputStream is owned by the caller.
 * @param keyId key identifier
 * @param cipher the symmetric cipher to use for encryption. If null or empty then a default cipher is used.
 * @return an {@link OutputStream} to write content to for encryption
 * @throws IOException
 */
public OutputStream encryptFile(OutputStream outputStream, InputStream keyIn, long keyId, String cipher)
    throws IOException {
  try {
    if (Security.getProvider(PROVIDER_NAME) == null) {
      Security.addProvider(new BouncyCastleProvider());
    }

    PGPEncryptedDataGenerator cPk = new PGPEncryptedDataGenerator(
        new JcePGPDataEncryptorBuilder(symmetricKeyAlgorithmNameToTag(cipher))
            .setSecureRandom(new SecureRandom())
            .setProvider(PROVIDER_NAME));

    PGPPublicKey publicKey;
    PGPPublicKeyRingCollection keyRings = new PGPPublicKeyRingCollection(PGPUtil.getDecoderStream(keyIn),
        new BcKeyFingerprintCalculator());
    publicKey = keyRings.getPublicKey(keyId);

    if (publicKey == null) {
      throw new IllegalArgumentException("public key for encryption not found");
    }

    cPk.addMethod(new JcePublicKeyKeyEncryptionMethodGenerator(publicKey).setProvider(PROVIDER_NAME));

    OutputStream cOut = cPk.open(outputStream, new byte[BUFFER_SIZE]);

    PGPLiteralDataGenerator literalGen = new PGPLiteralDataGenerator();
    OutputStream _literalOut =
        literalGen.open(cOut, PGPLiteralDataGenerator.BINARY, PAYLOAD_NAME, new Date(), new byte[BUFFER_SIZE]);

    return new ClosingWrapperOutputStream(_literalOut, cOut, outputStream);
  } catch (PGPException e) {
    throw new IOException(e);
  }
}
 

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();
}