org.apache.poi.poifs.crypt.cryptoapi
Class CryptoAPIEncryptor

java.lang.Object
  org.apache.poi.poifs.crypt.Encryptor
      org.apache.poi.poifs.crypt.cryptoapi.CryptoAPIEncryptor

All Implemented Interfaces:

java.lang.Cloneable

public class CryptoAPIEncryptor
extends Encryptor
implements java.lang.Cloneable

CryptoAPIEncryptor

protected CryptoAPIEncryptor()

confirmPassword

public void confirmPassword(java.lang.String password)

Specified by:

confirmPassword in class Encryptor

confirmPassword

public void confirmPassword(java.lang.String password,
                            byte[] keySpec,
                            byte[] keySalt,
                            byte[] verifier,
                            byte[] verifierSalt,
                            byte[] integritySalt)

Specified by:

confirmPassword in class Encryptor

initCipherForBlock

public javax.crypto.Cipher initCipherForBlock(javax.crypto.Cipher cipher,
                                              int block)
                                       throws java.security.GeneralSecurityException

Initializes a cipher object for a given block index for encryption

Parameters:

cipher - may be null, otherwise the given instance is reset to the new block index

block - the block index, e.g. the persist/slide id (hslf)

Returns:

a new cipher object, if cipher was null, otherwise the reinitialized cipher

Throws:

java.security.GeneralSecurityException

getDataStream

public ChunkedCipherOutputStream getDataStream(DirectoryNode dir)
                                        throws java.io.IOException,
                                               java.security.GeneralSecurityException

Description copied from class: Encryptor

Return a output stream for encrypted data.

Specified by:

getDataStream in class Encryptor

Parameters:

dir - the node to write to

Returns:

encrypted stream

Throws:

java.io.IOException

java.security.GeneralSecurityException

getDataStream

public CryptoAPIEncryptor.CryptoAPICipherOutputStream getDataStream(java.io.OutputStream stream,
                                                                    int initialOffset)
                                                             throws java.io.IOException,
                                                                    java.security.GeneralSecurityException

Overrides:

getDataStream in class Encryptor

Throws:

java.io.IOException

java.security.GeneralSecurityException

setSummaryEntries

public void setSummaryEntries(DirectoryNode dir,
                              java.lang.String encryptedStream,
                              NPOIFSFileSystem entries)
                       throws java.io.IOException,
                              java.security.GeneralSecurityException

Encrypt the Document-/SummaryInformation and other optionally streams. Opposed to other crypto modes, cryptoapi is record based and can't be used to stream-encrypt a whole file

Throws:

java.io.IOException

java.security.GeneralSecurityException

See Also:

2.3.5.4 RC4 CryptoAPI Encrypted Summary Stream

getKeySizeInBytes

protected int getKeySizeInBytes()

setChunkSize

public void setChunkSize(int chunkSize)

Description copied from class: Encryptor

Sets the chunk size of the data stream. Needs to be set before the data stream is requested. When not set, the implementation uses method specific default values

Overrides:

setChunkSize in class Encryptor

Parameters:

chunkSize - the chunk size, i.e. the block size with the same encryption key

createEncryptionInfoEntry

protected void createEncryptionInfoEntry(DirectoryNode dir)
                                  throws java.io.IOException

Throws:

java.io.IOException

clone

public CryptoAPIEncryptor clone()
                         throws java.lang.CloneNotSupportedException

Overrides:

clone in class Encryptor

Throws:

java.lang.CloneNotSupportedException