public class StandardDecryptor extends Decryptor
DEFAULT_PASSWORD, info
Modifier | Constructor and Description |
---|---|
protected |
StandardDecryptor(EncryptionInfo info) |
Modifier and Type | Method and Description |
---|---|
protected static byte[] |
fillAndXor(byte[] hash,
byte fillByte) |
protected static javax.crypto.SecretKey |
generateSecretKey(java.lang.String password,
EncryptionVerifier ver,
int keySize) |
java.io.InputStream |
getDataStream(DirectoryNode dir)
Return a stream with decrypted data.
|
protected int |
getKeySizeInBytes() |
long |
getLength()
Returns the length of the encytpted data that can be safely read with
Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode) . |
protected static byte[] |
truncateOrPad(byte[] source,
int length)
Returns a byte array of the requested length,
truncated or zero padded as needed.
|
boolean |
verifyPassword(java.lang.String password) |
getDataStream, getDataStream, getInstance, getIntegrityHmacKey, getIntegrityHmacValue, getSecretKey, getVerifier, setIntegrityHmacKey, setIntegrityHmacValue, setSecretKey, setVerifier
protected StandardDecryptor(EncryptionInfo info)
public boolean verifyPassword(java.lang.String password)
verifyPassword
in class Decryptor
protected static javax.crypto.SecretKey generateSecretKey(java.lang.String password, EncryptionVerifier ver, int keySize)
protected static byte[] fillAndXor(byte[] hash, byte fillByte)
protected static byte[] truncateOrPad(byte[] source, int length)
public java.io.InputStream getDataStream(DirectoryNode dir) throws java.io.IOException
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
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.
protected int getKeySizeInBytes()
Copyright 2016 The Apache Software Foundation or its licensors, as applicable.