public EncryptionInfo(DirectoryNode dir)
{
DocumentInputStream dis = dir.CreateDocumentInputStream("EncryptionInfo");
versionMajor = dis.ReadShort();
versionMinor = dis.ReadShort();
encryptionFlags = dis.ReadInt();
if (versionMajor == 4 && versionMinor == 4 && encryptionFlags == 0x40)
{
StringBuilder builder = new StringBuilder();
byte[] xmlDescriptor = new byte[dis.Available()];
dis.Read(xmlDescriptor);
foreach (byte b in xmlDescriptor)
builder.Append((char)b);
string descriptor = builder.ToString();
header = new EncryptionHeader(descriptor);
verifier = new EncryptionVerifier(descriptor);
}
else
{
int hSize = dis.ReadInt();
header = new EncryptionHeader(dis);
if (header.Algorithm == EncryptionHeader.ALGORITHM_RC4)
{
verifier = new EncryptionVerifier(dis, 20);
}
else
{
verifier = new EncryptionVerifier(dis, 32);
}
}
}
/// <summary>
/// Creates an instance of this class from an embedded OLE Object. The OLE Object is expected
/// to include a stream "{01}Ole10Native" which contains the actual
/// data relevant for this class.
/// </summary>
/// <param name="directory">directory POI Filesystem object</param>
/// <returns>Returns an instance of this class</returns>
public static Ole10Native CreateFromEmbeddedOleObject(DirectoryNode directory)
{
DocumentEntry nativeEntry =
(DocumentEntry)directory.GetEntry(OLE10_NATIVE);
byte[] data = new byte[nativeEntry.Size];
directory.CreateDocumentInputStream(nativeEntry).Read(data);
return(new Ole10Native(data, 0));
}
/// <summary>
/// Creates an instance of this class from an embedded OLE Object. The OLE Object is expected
/// to include a stream "{01}Ole10Native" which contains the actual
/// data relevant for this class.
/// </summary>
/// <param name="directory">directory POI Filesystem object</param>
/// <returns>Returns an instance of this class</returns>
public static Ole10Native CreateFromEmbeddedOleObject(DirectoryNode directory)
{
bool plain = false;
try
{
directory.GetEntry("\u0001Ole10ItemName");
plain = true;
}
catch (FileNotFoundException)
{
plain = false;
}
DocumentEntry nativeEntry =
(DocumentEntry)directory.GetEntry(OLE10_NATIVE);
byte[] data = new byte[nativeEntry.Size];
directory.CreateDocumentInputStream(nativeEntry).Read(data);
return new Ole10Native(data, 0, plain);
}
/// <summary>
/// Creates an instance of this class from an embedded OLE Object. The OLE Object is expected
/// to include a stream "{01}Ole10Native" which contains the actual
/// data relevant for this class.
/// </summary>
/// <param name="directory">directory POI Filesystem object</param>
/// <returns>Returns an instance of this class</returns>
public static Ole10Native CreateFromEmbeddedOleObject(DirectoryNode directory)
{
bool plain = false;
try
{
directory.GetEntry("\u0001Ole10ItemName");
plain = true;
}
catch (FileNotFoundException)
{
plain = false;
}
DocumentEntry nativeEntry =
(DocumentEntry)directory.GetEntry(OLE10_NATIVE);
byte[] data = new byte[nativeEntry.Size];
directory.CreateDocumentInputStream(nativeEntry).Read(data);
return(new Ole10Native(data, 0));
}
public override Stream GetDataStream(DirectoryNode dir)
{
DocumentInputStream dis = dir.CreateDocumentInputStream("EncryptedPackage");
_length = dis.ReadLong();
return new ChunkedCipherInputStream(dis, _length, this);
}
/**
* open a document in the root entry's list of entries
*
* @param documentName the name of the document to be opened
*
* @return a newly opened DocumentInputStream
*
* @exception IOException if the document does not exist or the
* name is that of a DirectoryEntry
*/
public DocumentInputStream CreateDocumentInputStream(string documentName)
{
return(Root.CreateDocumentInputStream(documentName));
}
private void Open(DirectoryNode directory)
{
DocumentNode book = (DocumentNode)directory.GetEntry("Book");
if (book == null)
{
throw new IOException("No Excel 5/95 Book stream found");
}
ris = new RecordInputStream(directory.CreateDocumentInputStream(book));
Prepare();
}
PropertySet GetPropertySet(DirectoryNode dir, string name)
{
DocumentInputStream dis = dir.CreateDocumentInputStream(name);
PropertySet set = PropertySetFactory.Create(dis);
return set;
}
public override Stream GetDataStream(DirectoryNode dir)
{
DocumentInputStream dr = dir.CreateDocumentInputStream("EncryptedPackage");
long size = dr.ReadLong();
SymmetricAlgorithm cipher=GetCipher();
return new CryptoStream(dr, cipher.CreateDecryptor(cipher.Key, cipher.IV), CryptoStreamMode.Read);
}
/// <summary>
/// Creates an instance of this class from an embedded OLE Object. The OLE Object is expected
/// to include a stream "{01}Ole10Native" which contains the actual
/// data relevant for this class.
/// </summary>
/// <param name="directory">directory POI Filesystem object</param>
/// <returns>Returns an instance of this class</returns>
public static Ole10Native CreateFromEmbeddedOleObject(DirectoryNode directory)
{
DocumentEntry nativeEntry =
(DocumentEntry)directory.GetEntry(OLE10_NATIVE);
byte[] data = new byte[nativeEntry.Size];
directory.CreateDocumentInputStream(nativeEntry).Read(data);
return new Ole10Native(data, 0);
}
public override Stream GetDataStream(DirectoryNode dir)
{
DocumentInputStream dr = dir.CreateDocumentInputStream("EncryptedPackage");
long size = dr.ReadLong();
return new ChunkedCipherInputStream(dr, size, this);
}
