public class BinaryRC4Decryptor extends Decryptor
builder, DEFAULT_PASSWORD, DEFAULT_POIFS_ENTRY
Modifier | Constructor and Description |
---|---|
protected |
BinaryRC4Decryptor(BinaryRC4EncryptionInfoBuilder builder) |
Modifier and Type | Method and Description |
---|---|
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) |
getBlockSizeInBytes, getDataStream, getDataStream, getDataStream, getInstance, getIntegrityHmacKey, getIntegrityHmacValue, getKeySizeInBytes, getSecretKey, getVerifier, setIntegrityHmacKey, setIntegrityHmacValue, setSecretKey, setVerifier
protected BinaryRC4Decryptor(BinaryRC4EncryptionInfoBuilder builder)
public boolean verifyPassword(java.lang.String password)
verifyPassword
in class Decryptor
protected static javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher cipher, int block, EncryptionInfoBuilder builder, javax.crypto.SecretKey skey, int encryptMode) throws java.security.GeneralSecurityException
java.security.GeneralSecurityException
protected static javax.crypto.SecretKey generateSecretKey(java.lang.String password, EncryptionVerifier ver)
public java.io.InputStream getDataStream(DirectoryNode dir) throws java.io.IOException, java.security.GeneralSecurityException
Decryptor
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
getDataStream
in class Decryptor
dir
- the node to read fromjava.io.IOException
java.security.GeneralSecurityException
public long getLength()
Decryptor
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.
Copyright 2018 The Apache Software Foundation or its licensors, as applicable.