public class XORDecryptor extends Decryptor
DEFAULT_PASSWORD, DEFAULT_POIFS_ENTRY, encryptionInfo
Modifier | Constructor and Description |
---|---|
protected |
XORDecryptor() |
protected |
XORDecryptor(XORDecryptor other) |
Modifier and Type | Method and Description |
---|---|
XORDecryptor |
copy() |
ChunkedCipherInputStream |
getDataStream(DirectoryNode dir)
Return a stream with decrypted data.
|
java.io.InputStream |
getDataStream(java.io.InputStream stream,
int size,
int initialPos)
Wraps a stream for decryption
|
long |
getLength()
Returns the length of the encrypted data that can be safely read with
Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode) . |
javax.crypto.Cipher |
initCipherForBlock(javax.crypto.Cipher cipher,
int block)
Initializes a cipher object for a given block index for encryption
|
protected static javax.crypto.Cipher |
initCipherForBlock(javax.crypto.Cipher cipher,
int block,
EncryptionInfo encryptionInfo,
javax.crypto.SecretKey skey,
int encryptMode) |
void |
setChunkSize(int chunkSize)
Sets the chunk size of the data stream.
|
boolean |
verifyPassword(java.lang.String password) |
getBlockSizeInBytes, getDataStream, getEncryptionInfo, getGenericProperties, getInstance, getIntegrityHmacKey, getIntegrityHmacValue, getKeySizeInBytes, getSecretKey, getVerifier, setEncryptionInfo, setIntegrityHmacKey, setIntegrityHmacValue, setSecretKey, setVerifier
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
getGenericChildren, getGenericRecordType
protected XORDecryptor()
protected XORDecryptor(XORDecryptor other)
public boolean verifyPassword(java.lang.String password)
verifyPassword
in class Decryptor
public javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher cipher, int block) throws java.security.GeneralSecurityException
Decryptor
initCipherForBlock
in class Decryptor
cipher
- may be null, otherwise the given instance is reset to the new block indexblock
- the block index, e.g. the persist/slide id (hslf)java.security.GeneralSecurityException
- if the cipher can't be initializedprotected static javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher cipher, int block, EncryptionInfo encryptionInfo, javax.crypto.SecretKey skey, int encryptMode) throws java.security.GeneralSecurityException
java.security.GeneralSecurityException
public ChunkedCipherInputStream getDataStream(DirectoryNode dir) throws java.io.IOException, java.security.GeneralSecurityException
Decryptor
Use Decryptor.getLength()
to get the size of that data that can be safely read from the stream.
Just reading to the end of the input stream is not sufficient because there are
normally padding bytes that must be discarded
getDataStream
in class Decryptor
dir
- the node to read fromjava.io.IOException
java.security.GeneralSecurityException
public java.io.InputStream getDataStream(java.io.InputStream stream, int size, int initialPos) throws java.io.IOException, java.security.GeneralSecurityException
Decryptor
As we are handling streams and don't know the total length beforehand, it's the callers duty to care for the length of the entries.
getDataStream
in class Decryptor
stream
- the stream to be wrappedinitialPos
- initial/current byte position within the streamjava.io.IOException
java.security.GeneralSecurityException
public long getLength()
Decryptor
Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode)
.
Just reading to the end of the input stream is not sufficient because there are
normally padding bytes that must be discarded
The length variable is initialized in Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode)
,
an attempt to call getLength() prior to getDataStream() will result in IllegalStateException.
public void setChunkSize(int chunkSize)
Decryptor
setChunkSize
in class Decryptor
chunkSize
- the chunk size, i.e. the block size with the same encryption keypublic XORDecryptor copy()
Copyright 2020 The Apache Software Foundation or its licensors, as applicable.