Package org.verapdf.cos.filters

Class COSFilterAESDecryptionDefault

java.lang.Object

java.io.InputStream

org.verapdf.as.io.ASInputStream

org.verapdf.as.filters.ASInFilter

org.verapdf.as.filters.io.ASBufferedInFilter

org.verapdf.cos.filters.COSFilterAESDecryptionDefault

All Implemented Interfaces:

Closeable, AutoCloseable

public class COSFilterAESDecryptionDefault
extends ASBufferedInFilter

This filter decrypts data using AES cipher as described in Algorithm 1 of 7.6.2 of ISO 32000:2008.

Author:

Sergey Shemyakov

Field Summary

Fields inherited from class org.verapdf.as.filters.io.ASBufferedInFilter

BF_BUFFER_SIZE, buffer, START_BUFFER_SIZE

Fields inherited from class org.verapdf.as.io.ASInputStream

isClosed, isSourceClosed, resourceUsers

Constructor Summary

Constructors

Constructor	Description
COSFilterAESDecryptionDefault(ASInputStream stream, COSKey objectKey, byte[] encryptionKey, boolean decryptingCOSStream, ASAtom method)	Constructor.

Method Summary

Modifier and Type	Method	Description
int	read(byte[] buffer, int size)
void	reset()

Methods inherited from class org.verapdf.as.filters.io.ASBufferedInFilter

addToBuffer, bufferPop, bufferPopArray, bufferSize, closeResource, concatenate, feedBuffer, getBufferBegin, getBufferCapacity, getBufferEnd, getReadCounter, getStream, getStreamUntilToken, initialize, isEOF, peek, peek, processBuffer, read, readByte, resetReadCounter, skip, unread, unread

Methods inherited from class org.verapdf.as.filters.ASInFilter

close, decrementResourceUsers, getInputStream, incrementResourceUsers, read, setInputStream

Methods inherited from class org.verapdf.as.io.ASInputStream

createStreamFromStream

Methods inherited from class java.io.InputStream

available, mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, skip, skipNBytes, transferTo

Methods inherited from class java.lang.Object

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

Constructor Details

COSFilterAESDecryptionDefault

public COSFilterAESDecryptionDefault(ASInputStream stream,
 COSKey objectKey,
 byte[] encryptionKey,
 boolean decryptingCOSStream,
 ASAtom method)
                              throws IOException,
GeneralSecurityException

Constructor.

Parameters:

stream - is stream with encrypted data.

objectKey - contains object and generation numbers from object identifier for object that is being decrypted. If it is direct object, objectKey is taken from indirect object that contains it.

encryptionKey - is encryption key that is calculated from user password and encryption dictionary.

method - value of CFM key in crypt filter dictionary, should be AESV2 or AESV3.

Throws:

IOException

GeneralSecurityException

Method Details

read

public int read(byte[] buffer,
 int size)
         throws IOException

Overrides:

read in class ASBufferedInFilter

Throws:

IOException

reset

public void reset()
           throws IOException

Description copied from class: ASBufferedInFilter

Overrides:

reset in class ASBufferedInFilter

Throws:

IOException