Example usage for org.bouncycastle.openpgp PGPCompressedDataGenerator PGPCompressedDataGenerator

Introduction

In this page you can find the example usage for org.bouncycastle.openpgp PGPCompressedDataGenerator PGPCompressedDataGenerator.

Prototype

public PGPCompressedDataGenerator(int algorithm, int compression) 

Source Link

Document

Construct a new compressed data generator.

Usage

From source file:org.apache.nifi.processors.standard.util.PGPUtil.java

License:Apache License

public static void encrypt(InputStream in, OutputStream out, String algorithm, String provider, int cipher,
        String filename, PGPKeyEncryptionMethodGenerator encryptionMethodGenerator)
        throws IOException, PGPException {
    if (StringUtils.isEmpty(algorithm)) {
        throw new IllegalArgumentException("The algorithm must be specified");
    }//  www .  jav  a 2 s  .  c  o m
    final boolean isArmored = EncryptContent.isPGPArmoredAlgorithm(algorithm);
    OutputStream output = out;
    if (isArmored) {
        output = new ArmoredOutputStream(out);
    }

    // Default value, do not allow null encryption
    if (cipher == PGPEncryptedData.NULL) {
        logger.warn("Null encryption not allowed; defaulting to AES-128");
        cipher = PGPEncryptedData.AES_128;
    }

    try {
        // TODO: Can probably hard-code provider to BC and remove one method parameter
        PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator(
                new JcePGPDataEncryptorBuilder(cipher).setWithIntegrityPacket(true)
                        .setSecureRandom(new SecureRandom()).setProvider(provider));

        encryptedDataGenerator.addMethod(encryptionMethodGenerator);

        try (OutputStream encryptedOut = encryptedDataGenerator.open(output, new byte[BUFFER_SIZE])) {
            PGPCompressedDataGenerator compressedDataGenerator = new PGPCompressedDataGenerator(
                    PGPCompressedData.ZIP, Deflater.BEST_SPEED);
            try (OutputStream compressedOut = compressedDataGenerator.open(encryptedOut,
                    new byte[BUFFER_SIZE])) {
                PGPLiteralDataGenerator literalDataGenerator = new PGPLiteralDataGenerator();
                try (OutputStream literalOut = literalDataGenerator.open(compressedOut, PGPLiteralData.BINARY,
                        filename, new Date(), new byte[BUFFER_SIZE])) {

                    final byte[] buffer = new byte[BLOCK_SIZE];
                    int len;
                    while ((len = in.read(buffer)) > -1) {
                        literalOut.write(buffer, 0, len);
                    }
                }
            }
        }
    } finally {
        if (isArmored) {
            output.close();
        }
    }
}

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