org.apache.poi.poifs.crypt
Class AgileDecryptor
java.lang.Object
org.apache.poi.poifs.crypt.Decryptor
org.apache.poi.poifs.crypt.AgileDecryptor
public class AgileDecryptor
- extends Decryptor
- Author:
- Gary King
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
AgileDecryptor
protected AgileDecryptor(EncryptionInfo info)
verifyPassword
public boolean verifyPassword(java.lang.String password)
throws java.security.GeneralSecurityException
- Specified by:
verifyPassword
in class Decryptor
- Throws:
java.security.GeneralSecurityException
getDataStream
public java.io.InputStream getDataStream(DirectoryNode dir)
throws java.io.IOException,
java.security.GeneralSecurityException
- 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
java.security.GeneralSecurityException
getLength
public long getLength()
- Description copied from class:
Decryptor
- Returns the length of the encytpted 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:
- length of the encrypted data
generateIv
protected byte[] generateIv(int algorithm,
byte[] salt,
byte[] blockKey)
throws java.security.NoSuchAlgorithmException
- Throws:
java.security.NoSuchAlgorithmException
Copyright 2012 The Apache Software Foundation or
its licensors, as applicable.