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

Introduction

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

Prototype

public byte[] getDigest() 

Source Link

Usage

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 w w  w  .j  a  v a 2 s  .co 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 ww  w  . j av  a 2s .  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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