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package org.bouncycastle.openpgp.operator;
import java.io.OutputStream;
/**
* A data encryptor, combining a cipher instance and an optional integrity check calculator.
* <p/>
* {@link PGPDataEncryptor} instances are generally not constructed directly, but obtained from a
* {@link PGPDataEncryptorBuilder}.
*/
public interface PGPDataEncryptor
{
/**
* Constructs an encrypting output stream that encrypts data using the underlying cipher of this
* encryptor.
* <p/>
* The cipher instance in this encryptor is used for all output streams obtained from this
* method, so it should only be invoked once.
*
* @param out the stream to wrap and write encrypted data to.
* @return a cipher output stream appropriate to the type of this data encryptor.
*/
OutputStream getOutputStream(OutputStream out);
/**
* Obtains the integrity check calculator configured for this encryptor instance.
*
* @return the integrity check calculator, or <code>null</code> if no integrity checking was
* configured.
*/
PGPDigestCalculator getIntegrityCalculator();
/**
* Gets the block size of the underlying cipher used by this encryptor.
*
* @return the block size in bytes.
*/
int getBlockSize();
}
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