Example usage for org.bouncycastle.openpgp PGPPublicKeyEncryptedData isIntegrityProtected

Introduction

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

Prototype

public boolean isIntegrityProtected() 

Source Link

Document

Checks whether the packet is integrity protected.

Usage

From source file:org.pgptool.gui.encryption.implpgp.EncryptionServicePgpImpl.java

License:Open Source License

/**
 * decrypt the passed in message stream.
 * /*  ww  w . j  a  va 2s. co  m*/
 * Inspired by
 * https://github.com/bcgit/bc-java/blob/master/pg/src/main/java/org/bouncycastle/openpgp/examples/KeyBasedFileProcessor.java
 * 
 * @param countingStream
 *            this stream is passed for progress reporting only, must not be
 *            used to actually read data
 */
private void decryptStream(PGPPublicKeyEncryptedData pbe, PGPPrivateKey privateKey, OutputStream outputStream,
        Updater optionalProgress, CountingInputStream countingStream)
        throws UserRequestedCancellationException {
    try {
        InputStream clear = pbe.getDataStream(new BcPublicKeyDataDecryptorFactory(privateKey));

        BcPGPObjectFactory plainFact = new BcPGPObjectFactory(clear);
        Object message = plainFact.nextObject();
        if (message instanceof PGPMarker) {
            message = plainFact.nextObject();
        }

        BcPGPObjectFactory pgpFactory = null;
        if (message instanceof PGPCompressedData) {
            PGPCompressedData cData = (PGPCompressedData) message;
            pgpFactory = new BcPGPObjectFactory(cData.getDataStream());
            message = pgpFactory.nextObject();
        }

        int watchDog = 0;
        while (message != null) {
            Preconditions.checkState(watchDog++ < 100, "Inifinite loop watch dog just hit");

            if (message instanceof PGPLiteralData) {
                PGPLiteralData ld = (PGPLiteralData) message;

                // NOTE: We know initial file name (in case we need it):
                // ld.getFileName();
                InputStream unc = ld.getInputStream();
                OutputStream fOut = new BufferedOutputStream(outputStream);
                if (optionalProgress != null) {
                    optionalProgress.updateStepInfo("progress.decrypting");
                }

                pipeStream(unc, fOut, BUFFER_SIZE, optionalProgress, countingStream);
                fOut.close();
                unc.close();

                if (pbe.isIntegrityProtected()) {
                    if (!pbe.verify()) {
                        throw new RuntimeException("message failed integrity check");
                    }
                }
                return;
            } else if (message instanceof PGPOnePassSignatureList) {
                log.info("PGPOnePassSignatureList is not implemented yet. Skipping signature validation");
                // NOTE: Here is a place to copyright from
                // http://stackoverflow.com/questions/19173181/bouncycastle-pgp-decrypt-and-verify
                Preconditions.checkArgument(pgpFactory != null,
                        "File format is not supported. pgpFact is supposed to be initialized by that time");
                message = pgpFactory.nextObject();
            } else if (message instanceof PGPSignatureList) {
                log.info("PGPSignatureList is not implemented yet. Skipping signature validation");
                Preconditions.checkArgument(pgpFactory != null,
                        "File format is not supported. pgpFact is supposed to be initialized by that time");
                message = pgpFactory.nextObject();
            } else {
                throw new PGPException(
                        "Don't know how to decrypt the input file. Encountered unexpected block: " + message);
            }
        }
    } catch (Throwable e) {
        Throwables.throwIfInstanceOf(e, UserRequestedCancellationException.class);
        throw new RuntimeException("Decryption failed", e);
    }
}

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