Example usage for org.bouncycastle.crypto.io DigestOutputStream DigestOutputStream

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.io DigestOutputStream DigestOutputStream.

Prototype

public DigestOutputStream(Digest Digest) 

Source Link

Usage

From source file:com.joyent.manta.http.entity.DigestedEntity.java

License:Open Source License

@Override
public void writeTo(final OutputStream out) throws IOException {
    digest.reset(); // reset the digest state in case we're in a retry

    // If our wrapped entity is backed by a buffer of some form
    // we can read easily read the whole buffer into our message digest.
    if (wrapped instanceof MemoryBackedEntity) {
        final MemoryBackedEntity entity = (MemoryBackedEntity) wrapped;
        final ByteBuffer backingBuffer = entity.getBackingBuffer();

        if (backingBuffer.hasArray()) {
            final byte[] bytes = backingBuffer.array();
            final int offset = backingBuffer.arrayOffset();
            final int position = backingBuffer.position();
            final int limit = backingBuffer.limit();

            digest.update(bytes, offset + position, limit - position);
            backingBuffer.position(limit);

            wrapped.writeTo(out);//from  w w  w.  j  av  a2s .  c  o m
        }
    } else {
        try (DigestOutputStream dout = new DigestOutputStream(digest);
                TeeOutputStream teeOut = new TeeOutputStream(out, dout)) {
            wrapped.writeTo(teeOut);
            teeOut.flush();
        }
    }
}

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From source file:edu.wisc.doit.tcrypt.BouncyCastleFileDecrypter.java

License:Apache License

@Override
public void decrypt(InputStream inputStream, OutputStream outputStream)
        throws InvalidCipherTextException, IOException, DecoderException {
    final TarArchiveInputStream tarInputStream = new TarArchiveInputStream(inputStream, FileEncrypter.ENCODING);

    final BufferedBlockCipher cipher = createCipher(tarInputStream);

    //Advance to the next entry in the tar file
    tarInputStream.getNextTarEntry();/*from   ww  w . j  a  v a 2 s .c o  m*/

    //Create digest output stream used to generate digest while decrypting
    final DigestOutputStream digestOutputStream = new DigestOutputStream(this.createDigester());

    //Do a streaming decryption of the file output
    final CipherOutputStream cipherOutputStream = new CipherOutputStream(
            new TeeOutputStream(outputStream, digestOutputStream), cipher);
    IOUtils.copy(tarInputStream, cipherOutputStream);
    cipherOutputStream.close();

    //Capture the hash of the decrypted output
    final byte[] hashBytes = digestOutputStream.getDigest();
    verifyOutputHash(tarInputStream, hashBytes);
}

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From source file:edu.wisc.doit.tcrypt.BouncyCastleFileEncrypter.java

License:Apache License

@Override
public void encrypt(String fileName, int size, InputStream inputStream, OutputStream outputStream)
        throws InvalidCipherTextException, IOException {
    final TarArchiveOutputStream tarArchiveOutputStream = new TarArchiveOutputStream(outputStream, 512,
            ENCODING);/*from   w  w w  . j  a  v  a  2 s.com*/

    final BufferedBlockCipher cipher = createCipher(tarArchiveOutputStream);

    startEncryptedFile(fileName, size, tarArchiveOutputStream, cipher);

    //Setup cipher output stream, has to protect from close as the cipher stream must close but the tar cannot get closed yet
    final CipherOutputStream cipherOutputStream = new CipherOutputStream(
            new CloseShieldOutputStream(tarArchiveOutputStream), cipher);

    //Setup digester
    final DigestOutputStream digestOutputStream = new DigestOutputStream(this.createDigester());

    //Perform streaming encryption and hashing of the file
    IOUtils.copy(inputStream, new TeeOutputStream(cipherOutputStream, digestOutputStream));
    cipherOutputStream.close();

    tarArchiveOutputStream.closeArchiveEntry();

    //Capture the hash code of the encrypted file
    digestOutputStream.close();
    final byte[] hashBytes = digestOutputStream.getDigest();

    this.writeHashfile(tarArchiveOutputStream, hashBytes);

    //Close the TAR stream, nothing else should be written to it
    tarArchiveOutputStream.close();
}

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From source file:edu.wisc.doit.tcrypt.BouncyCastleFileEncrypter.java

License:Apache License

@Override
public OutputStream encrypt(String fileName, int size, OutputStream outputStream)
        throws InvalidCipherTextException, IOException, DecoderException {
    final TarArchiveOutputStream tarOutputStream = new TarArchiveOutputStream(outputStream, ENCODING);

    final BufferedBlockCipher cipher = createCipher(tarOutputStream);

    startEncryptedFile(fileName, size, tarOutputStream, cipher);

    //Protect the underlying TAR stream from being closed by the cipher stream
    final CloseShieldOutputStream closeShieldTarStream = new CloseShieldOutputStream(tarOutputStream);

    //Setup the encrypting cipher stream
    final CipherOutputStream chipherStream = new CipherOutputStream(closeShieldTarStream, cipher);

    //Generate a digest of the pre-encryption data
    final GeneralDigest digest = this.createDigester();
    final DigestOutputStream digestOutputStream = new DigestOutputStream(digest);

    //Write data to both the digester and cipher
    final TeeOutputStream teeStream = new TeeOutputStream(digestOutputStream, chipherStream);
    return new EncryptingOutputStream(teeStream, tarOutputStream, digest);
}

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From source file:io.netty.example.ocsp.Digester.java

License:Apache License

private Digester(Digest digest, AlgorithmIdentifier algId) {
    this.dos = new DigestOutputStream(digest);
    this.algId = algId;
}

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