public StreamEncryptionInfo(RecordInputStream rs, List <Record> outputRecs)
{
Record rec;
rs.NextRecord();
int recSize = 4 + rs.Remaining;
rec = RecordFactory.CreateSingleRecord(rs);
outputRecs.Add(rec);
FilePassRecord fpr = null;
if (rec is BOFRecord)
{
_hasBOFRecord = true;
if (rs.HasNextRecord)
{
rs.NextRecord();
rec = RecordFactory.CreateSingleRecord(rs);
recSize += rec.RecordSize;
outputRecs.Add(rec);
if (rec is FilePassRecord)
{
fpr = (FilePassRecord)rec;
outputRecs.RemoveAt(outputRecs.Count - 1);
// TODO - add fpr not Added to outPutRecs
rec = outputRecs[0];
}
else
{
// workbook not encrypted (typical case)
if (rec is EOFRecord)
{
// A workbook stream is never empty, so crash instead
// of trying to keep track of nesting level
throw new InvalidOperationException("Nothing between BOF and EOF");
}
}
}
}
else
{
// Invalid in a normal workbook stream.
// However, some test cases work on sub-sections of
// the workbook stream that do not begin with BOF
_hasBOFRecord = false;
}
_InitialRecordsSize = recSize;
_filePassRec = fpr;
_lastRecord = rec;
}
public RecordInputStream CreateDecryptingStream(Stream original)
{
FilePassRecord fpr = _filePassRec;
String userPassword = Biff8EncryptionKey.CurrentUserPassword;
Biff8EncryptionKey key;
if (userPassword == null)
{
key = Biff8EncryptionKey.Create(fpr.DocId);
}
else
{
key = Biff8EncryptionKey.Create(userPassword, fpr.DocId);
}
if (!key.Validate(fpr.SaltData, fpr.SaltHash))
{
throw new EncryptedDocumentException(
(userPassword == null ? "Default" : "Supplied")
+ " password is invalid for docId/saltData/saltHash");
}
return(new RecordInputStream(original, key, _InitialRecordsSize));
}
