org.apache.poi.poifs.crypt.binaryrc4
Class BinaryRC4Decryptor
java.lang.Object
org.apache.poi.poifs.crypt.Decryptor
org.apache.poi.poifs.crypt.binaryrc4.BinaryRC4Decryptor
public class BinaryRC4Decryptor
- extends Decryptor
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 |
BinaryRC4Decryptor
protected BinaryRC4Decryptor(BinaryRC4EncryptionInfoBuilder builder)
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.