Package org.bouncycastle.crypto.internal.io

Class CipherOutputStreamImpl

java.lang.Object

java.io.OutputStream

org.bouncycastle.crypto.UpdateOutputStream

org.bouncycastle.crypto.CipherOutputStream

org.bouncycastle.crypto.internal.io.CipherOutputStreamImpl

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

public class CipherOutputStreamImpl
extends CipherOutputStream

A CipherOutputStream is composed of an OutputStream and a cipher so that write() methods process the written data with the cipher, and the output of the cipher is in turn written to the underlying OutputStream. The cipher must be fully initialized before being used by a CipherInputStream.

For example, if the cipher is initialized for encryption, the CipherOutputStream will encrypt the data before writing the encrypted data to the underlying stream.

Note: this class does not close the underlying stream on a close.

Constructor Summary

Constructors

Constructor	Description
CipherOutputStreamImpl(OutputStream out, BufferedBlockCipher cipher)	Constructs a CipherOutputStream from an OutputStream and a BufferedBlockCipher;.
CipherOutputStreamImpl(OutputStream out, AEADBlockCipher cipher)	Constructs a CipherOutputStream from an OutputStream and a AEADBlockCipher;.
CipherOutputStreamImpl(OutputStream out, StreamCipher cipher)	Constructs a CipherOutputStream from an OutputStream and a BufferedBlockCipher;.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this output stream and releases any system resources associated with this stream.
void	flush()	Flushes this output stream by forcing any buffered output bytes that have already been processed by the encapsulated cipher object to be written out.
void	write(byte[] b)	Writes b.length bytes from the specified byte array to this output stream.
void	write(byte[] b, int off, int len)	Writes len bytes from the specified byte array starting at offset off to this output stream.
void	write(int b)	Writes the specified byte to this output stream.

Methods inherited from class org.bouncycastle.crypto.UpdateOutputStream

update, update, update

Methods inherited from class java.io.OutputStream

nullOutputStream

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CipherOutputStreamImpl

public CipherOutputStreamImpl(OutputStream out,
 BufferedBlockCipher cipher)

Constructs a CipherOutputStream from an OutputStream and a BufferedBlockCipher;.

CipherOutputStreamImpl

public CipherOutputStreamImpl(OutputStream out,
 StreamCipher cipher)

Constructs a CipherOutputStream from an OutputStream and a BufferedBlockCipher;.

CipherOutputStreamImpl

public CipherOutputStreamImpl(OutputStream out,
 AEADBlockCipher cipher)

Constructs a CipherOutputStream from an OutputStream and a AEADBlockCipher;.

Method Details

write

public void write(int b)
           throws IOException

Writes the specified byte to this output stream.

Specified by:

write in class OutputStream

Parameters:

b - the byte.

Throws:

IOException - if an I/O error occurs.

write

public void write(byte[] b)
           throws IOException

Writes b.length bytes from the specified byte array to this output stream.

The write method of CipherOutputStream calls the write method of three arguments with the three arguments b, 0, and b.length.

Overrides:

write in class OutputStream

Parameters:

b - the data.

Throws:

IOException - if an I/O error occurs.

See Also:

• write(byte[], int, int)

write

public void write(byte[] b,
 int off,
 int len)
           throws IOException

Writes len bytes from the specified byte array starting at offset off to this output stream.

Overrides:

write in class OutputStream

Parameters:

b - the data.

off - the start offset in the data.

len - the number of bytes to write.

Throws:

IOException - if an I/O error occurs.

flush

public void flush()
           throws IOException

Flushes this output stream by forcing any buffered output bytes that have already been processed by the encapsulated cipher object to be written out.

Any bytes buffered by the encapsulated cipher and waiting to be processed by it will not be written out. For example, if the encapsulated cipher is a block cipher, and the total number of bytes written using one of the write methods is less than the cipher's block size, no bytes will be written out.

Specified by:

flush in interface Flushable

Overrides:

flush in class OutputStream

Throws:

IOException - if an I/O error occurs.

close

public void close()
           throws IOException

Closes this output stream and releases any system resources associated with this stream.

This method invokes the doFinal method of the encapsulated cipher object, which causes any bytes buffered by the encapsulated cipher to be processed. The result is written out by calling the flush method of this output stream.

This method resets the encapsulated cipher object to its initial state and does not call close method of the underlying output stream.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in class CipherOutputStream

Throws:

IOException - if an I/O error occurs.

InvalidCipherTextException - if the data written to this stream was invalid cipher text (e.g. the cipher is an AEAD cipher and the ciphertext tag check fails).