org.apache.poi.poifs.crypt.standard
Class StandardDecryptor

java.lang.Object
  extended by org.apache.poi.poifs.crypt.Decryptor
      extended by org.apache.poi.poifs.crypt.standard.StandardDecryptor

public class StandardDecryptor
extends Decryptor


Field Summary
 
Fields inherited from class org.apache.poi.poifs.crypt.Decryptor
builder, DEFAULT_PASSWORD, DEFAULT_POIFS_ENTRY
 
Constructor Summary
protected StandardDecryptor(EncryptionInfoBuilder builder)
           
 
Method Summary
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.
 long getLength()
          Returns the length of the encrypted data that can be safely read with Decryptor.getDataStream(org.apache.poi.poifs.filesystem.DirectoryNode).
 boolean verifyPassword(java.lang.String password)
           
 
Methods inherited from class org.apache.poi.poifs.crypt.Decryptor
getBlockSizeInBytes, getDataStream, getDataStream, getDataStream, getInstance, getIntegrityHmacKey, getIntegrityHmacValue, getKeySizeInBytes, getSecretKey, getVerifier, setIntegrityHmacKey, setIntegrityHmacValue, setSecretKey, setVerifier
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

StandardDecryptor

protected StandardDecryptor(EncryptionInfoBuilder builder)
Method Detail

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)


Copyright 2016 The Apache Software Foundation or its licensors, as applicable.