org.apache.poi.poifs.crypt.standard
Class StandardDecryptor
java.lang.Object
org.apache.poi.poifs.crypt.Decryptor
org.apache.poi.poifs.crypt.standard.StandardDecryptor
- All Implemented Interfaces:
- java.lang.Cloneable
public class StandardDecryptor
- extends Decryptor
- implements java.lang.Cloneable
| Methods inherited from class org.apache.poi.poifs.crypt.Decryptor |
getBlockSizeInBytes, getDataStream, getDataStream, getDataStream, getDataStream, getEncryptionInfo, getInstance, getIntegrityHmacKey, getIntegrityHmacValue, getKeySizeInBytes, getSecretKey, getVerifier, initCipherForBlock, setChunkSize, setEncryptionInfo, setIntegrityHmacKey, setIntegrityHmacValue, setSecretKey, setVerifier |
| Methods inherited from class java.lang.Object |
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
StandardDecryptor
protected StandardDecryptor()
verifyPassword
public boolean verifyPassword(java.lang.String password)
- Specified by:
verifyPassword in class Decryptor
generateSecretKey
protected static javax.crypto.SecretKey generateSecretKey(java.lang.String password,
EncryptionVerifier ver,
int keySize)
fillAndXor
protected static byte[] fillAndXor(byte[] hash,
byte fillByte)
getDataStream
public java.io.InputStream getDataStream(DirectoryNode dir)
throws java.io.IOException
- Description copied from class:
Decryptor
- Return a stream with decrypted data.
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
- Specified by:
getDataStream in class Decryptor
- Parameters:
dir - the node to read from
- Returns:
- decrypted stream
- Throws:
java.io.IOException
getLength
public long getLength()
- Description copied from class:
Decryptor
- Returns the length of the encrypted data that can be safely read with
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.
- Specified by:
getLength in class Decryptor
- Returns:
- the length of the stream returned by
getDataStream(DirectoryNode)
clone
public StandardDecryptor clone()
throws java.lang.CloneNotSupportedException
- Overrides:
clone in class Decryptor
- Throws:
java.lang.CloneNotSupportedException