org.apache.poi.poifs.crypt.binaryrc4
Class BinaryRC4Decryptor

java.lang.Object
  extended by org.apache.poi.poifs.crypt.Decryptor
      extended by org.apache.poi.poifs.crypt.binaryrc4.BinaryRC4Decryptor

public class BinaryRC4Decryptor
extends Decryptor


Field Summary
 
Fields inherited from class org.apache.poi.poifs.crypt.Decryptor
builder, DEFAULT_PASSWORD, DEFAULT_POIFS_ENTRY
 
Constructor Summary
protected BinaryRC4Decryptor(BinaryRC4EncryptionInfoBuilder builder)
           
 
Method Summary
protected static javax.crypto.SecretKey generateSecretKey(java.lang.String password, EncryptionVerifier ver)
           
 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).
protected static javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher cipher, int block, EncryptionInfoBuilder builder, javax.crypto.SecretKey skey, int encryptMode)
           
 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

BinaryRC4Decryptor

protected BinaryRC4Decryptor(BinaryRC4EncryptionInfoBuilder builder)
Method Detail

verifyPassword

public boolean verifyPassword(java.lang.String password)
Specified by:
verifyPassword in class Decryptor

initCipherForBlock

protected static javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher cipher,
                                                        int block,
                                                        EncryptionInfoBuilder builder,
                                                        javax.crypto.SecretKey skey,
                                                        int encryptMode)
                                                 throws java.security.GeneralSecurityException
Throws:
java.security.GeneralSecurityException

generateSecretKey

protected static javax.crypto.SecretKey generateSecretKey(java.lang.String password,
                                                          EncryptionVerifier ver)

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 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:
length of the encrypted data


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