public void Security(string PDF,
string userPassword,
PasswordValidity userPasswordValidity,
string ownerPassword,
PasswordValidity ownerPasswordValidity)
{
string errorMsg = string.Empty;
string filePath = Path.Combine(TestHelper.DataFolder, PDF);
Assert.IsTrue(File.Exists(filePath));
PdfFile pdfFile = new PdfFile(filePath);
pdfFile.Open(ref errorMsg);
Assert.IsTrue(string.IsNullOrEmpty(errorMsg));
IDecryptor pdfDecryptor = DecryptorFactory.Get(pdfFile.EncryptionRecordInfo);
PasswordValidity passwordValidity =
pdfDecryptor.ValidatePassword(userPassword, ValidationMode.ValidateUserPassword);
Assert.AreEqual(passwordValidity, userPasswordValidity);
passwordValidity = pdfDecryptor.ValidatePassword(ownerPassword, ValidationMode.ValidateOwnerPassword);
Assert.AreEqual(passwordValidity, ownerPasswordValidity);
}
private void DecryptWorkerDoWork(object sender, DoWorkEventArgs e)
{
TimeSpan ts;
const int timeSlice = 50;
const int nrOfSpeedMeasurements = 50;
ulong passwordCount = 0, prevPasswordCount = 0;
object[] args = (object[])e.Argument;
IDecryptor decryptor = DecryptorFactory.Get((EncryptionRecord)args[0]);
IPasswordIterator passwordIterator = (IPasswordIterator)args[1];
ValidationMode validationMode = (ValidationMode)args[2];
IMovingAverage avg = new SimpleMovingAverage(nrOfSpeedMeasurements);
PasswordValidity passwordValidity = PasswordValidity.Invalid;
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
string currentPassword = passwordIterator.GetNextPassword();
while (!string.IsNullOrEmpty(currentPassword) &&
validationMode != ValidationMode.None &&
!decryptBackgroundWorker.CancellationPending)
{
passwordValidity = decryptor.ValidatePassword(currentPassword, validationMode);
passwordCount++;
ts = stopWatch.Elapsed;
if (ts.Milliseconds > timeSlice || passwordValidity != PasswordValidity.Invalid)
{
avg.AddSample((60000 * (passwordCount - prevPasswordCount)) / ((ulong)ts.Milliseconds + 1)); //Avoid div by zero
decryptBackgroundWorker.ReportProgress(0, new object[]
{ passwordValidity, currentPassword, (ulong)avg.Average, passwordCount });
prevPasswordCount = passwordCount;
stopWatch.Restart();
if ((passwordValidity & PasswordValidity.OwnerPasswordIsValid) == PasswordValidity.OwnerPasswordIsValid)
{
validationMode &= ~ValidationMode.ValidateOwnerPassword;
}
if ((passwordValidity & PasswordValidity.UserPasswordIsValid) == PasswordValidity.UserPasswordIsValid)
{
validationMode &= ~ValidationMode.ValidateUserPassword;
}
}
currentPassword = passwordIterator.GetNextPassword();
}
if (decryptBackgroundWorker.CancellationPending)
{
e.Cancel = true;
}
else
{
e.Result = passwordCount;
}
}
public void SetPassword(string password, PasswordValidity passwordValidity)
{
if ((passwordValidity & PasswordValidity.OwnerPasswordIsValid) == PasswordValidity.OwnerPasswordIsValid)
{
RecoveredOwnerPassword = password;
}
if ((passwordValidity & PasswordValidity.UserPasswordIsValid) == PasswordValidity.UserPasswordIsValid)
{
RecoveredUserPassword = password;
}
}
private void DecryptWorkerProgressChanged(object sender, ProgressChangedEventArgs e)
{
if (e.UserState != null)
{
object[] args = (object[])e.UserState;
PasswordValidity passwordValidity = (PasswordValidity)args[0];
CurrentPassword = args[1].ToString();
Speed = (ulong)args[2];
PasswordCount = (ulong)args[3];
if (passwordValidity != PasswordValidity.Invalid)
{
SelectedFile.SetPassword(CurrentPassword, passwordValidity);
WriteToFile(passwordValidity, CurrentPassword);
Status = string.Format("{0}: {1}", passwordValidity.ToString(), CurrentPassword);
}
}
}
public PasswordValidity ValidatePassword(string password, ValidationMode mode)
{
PasswordValidity isValid = PasswordValidity.Invalid;
if ((mode & ValidationMode.ValidateUserPassword) == ValidationMode.ValidateUserPassword &&
ValidateUserPassword(password) != PasswordValidity.Invalid)
{
isValid |= PasswordValidity.UserPasswordIsValid;
}
if ((mode & ValidationMode.ValidateOwnerPassword) == ValidationMode.ValidateOwnerPassword &&
ValidateOwnerPassword(password) != PasswordValidity.Invalid)
{
isValid |= PasswordValidity.OwnerPasswordIsValid;
}
return(isValid);
}
private Task WriteToFile(PasswordValidity passwordValidity, string CurrentPassword)
{
string destinationFilePath = string.Empty;
string summaryMsg = string.Format("{0},{1},{2}={3}{4}",
DateTime.Now.ToString(CultureInfo.CurrentCulture),
SelectedFile.Info.FullName, passwordValidity.ToString(),
CurrentPassword, Environment.NewLine);
FileMode fileMode = OverwritePasswordFile ? FileMode.Create : FileMode.Append;
if (SaveOptionsPasswordFile == SaveOptions.UseSourceFolder)
{
destinationFilePath = string.Format("{0}\\{1}", SelectedFile.Info.DirectoryName, PasswordStorageFilename);
}
else if (SaveOptionsPasswordFile == SaveOptions.UseCustomFolder)
{
destinationFilePath = string.Format("{0}\\{1}", SelectedSavePath, PasswordStorageFilename);
}
return(FileHelpers.WriteToFileAsync(destinationFilePath, fileMode, summaryMsg));
}
private void OnOkCmdExecute()
{
PasswordValidity validity = PdfDecryptor.ValidatePassword(Password,
ValidationMode.ValidateUserPassword | ValidationMode.ValidateOwnerPassword);
if (validity == PasswordValidity.Invalid)
{
ErrorContent = "Failed to unlock PDF, please try again [" + Password + "]";
ForegroundColor = Brushes.Red;
HasError = true;
}
else
{
ForegroundColor = Brushes.Green;
HasError = false;
if ((validity & PasswordValidity.UserPasswordIsValid) == PasswordValidity.UserPasswordIsValid &&
(validity & PasswordValidity.OwnerPasswordIsValid) == PasswordValidity.OwnerPasswordIsValid)
{
RecoveredUserPassword = Password;
RecoveredOwnerPassword = Password;
ErrorContent = string.Format("PDF unlocked with User and Owner password: [{0}].", Password);
}
else
{
if ((validity & PasswordValidity.UserPasswordIsValid) == PasswordValidity.UserPasswordIsValid)
{
RecoveredUserPassword = Password;
ErrorContent = string.Format("PDF unlocked with User password: [{0}].", Password);
}
if ((validity & PasswordValidity.OwnerPasswordIsValid) == PasswordValidity.OwnerPasswordIsValid)
{
RecoveredOwnerPassword = Password;
ErrorContent = string.Format("PDF unlocked with Owner password: [{0}].", Password);
}
}
}
Password = string.Empty;
}
/// <summary>
/// Opens an existing PDF document asynchronously.
/// </summary>
public static async Task <PdfDocument> OpenAsync(
Stream stream,
string password = null,
PdfDocumentOpenMode openmode = PdfDocumentOpenMode.Modify,
PdfPasswordProvider passwordProvider = null)
{
PdfDocument document;
#if !DEBUG
try
#endif
{
Lexer lexer = new Lexer(stream);
document = new PdfDocument(lexer);
document._state |= DocumentState.Imported;
document._openMode = openmode;
document._fileSize = stream.Length;
// Get file version.
byte[] header = new byte[1024];
stream.Position = 0;
stream.Read(header, 0, 1024);
document._version = GetPdfFileVersion(header);
if (document._version == 0)
{
throw new InvalidOperationException(PSSR.InvalidPdf);
}
document._irefTable.IsUnderConstruction = true;
Parser parser = new Parser(document);
// Read all trailers or cross-reference streams, but no objects.
document._trailer = await parser.ReadTrailerAsync();
if (document._trailer == null)
{
ParserDiagnostics.ThrowParserException("Invalid PDF file: no trailer found."); // TODO L10N using PSSR.
}
Debug.Assert(document._irefTable.IsUnderConstruction);
document._irefTable.IsUnderConstruction = false;
// Is document encrypted?
PdfReference xrefEncrypt = document._trailer.Elements[PdfTrailer.Keys.Encrypt] as PdfReference;
if (xrefEncrypt != null)
{
PdfObject encrypt = await parser.ReadObjectAsync(null, xrefEncrypt.ObjectID, false, false);
encrypt.Reference = xrefEncrypt;
xrefEncrypt.Value = encrypt;
PdfStandardSecurityHandler securityHandler = document.SecurityHandler;
TryAgain:
PasswordValidity validity = securityHandler.ValidatePassword(password);
if (validity == PasswordValidity.Invalid)
{
if (passwordProvider != null)
{
PdfPasswordProviderArgs args = new PdfPasswordProviderArgs();
passwordProvider(args);
if (args.Abort)
{
return(null);
}
password = args.Password;
goto TryAgain;
}
else
{
if (password == null)
{
throw new PdfReaderException(PSSR.PasswordRequired);
}
else
{
throw new PdfReaderException(PSSR.InvalidPassword);
}
}
}
else if (validity == PasswordValidity.UserPassword && openmode == PdfDocumentOpenMode.Modify)
{
if (passwordProvider != null)
{
PdfPasswordProviderArgs args = new PdfPasswordProviderArgs();
passwordProvider(args);
if (args.Abort)
{
return(null);
}
password = args.Password;
goto TryAgain;
}
else
{
throw new PdfReaderException(PSSR.OwnerPasswordRequired);
}
}
}
else
{
if (password != null)
{
// Password specified but document is not encrypted.
// ignore
}
}
PdfReference[] irefs2 = document._irefTable.AllReferences;
int count2 = irefs2.Length;
// 3rd: Create iRefs for all compressed objects.
Dictionary <int, object> objectStreams = new Dictionary <int, object>();
for (int idx = 0; idx < count2; idx++)
{
PdfReference iref = irefs2[idx];
if (iref.Value is PdfCrossReferenceStream xrefStream)
{
for (int idx2 = 0; idx2 < xrefStream.Entries.Count; idx2++)
{
PdfCrossReferenceStream.CrossReferenceStreamEntry item = xrefStream.Entries[idx2];
// Is type xref to compressed object?
if (item.Type == 2)
{
//PdfReference irefNew = parser.ReadCompressedObject(new PdfObjectID((int)item.Field2), (int)item.Field3);
//document._irefTable.Add(irefNew);
int objectNumber = (int)item.Field2;
if (!objectStreams.ContainsKey(objectNumber))
{
objectStreams.Add(objectNumber, null);
PdfObjectID objectID = new PdfObjectID((int)item.Field2);
parser.ReadIRefsFromCompressedObject(objectID);
}
}
}
}
}
// 4th: Read compressed objects.
for (int idx = 0; idx < count2; idx++)
{
PdfReference iref = irefs2[idx];
if (iref.Value is PdfCrossReferenceStream xrefStream)
{
for (int idx2 = 0; idx2 < xrefStream.Entries.Count; idx2++)
{
PdfCrossReferenceStream.CrossReferenceStreamEntry item = xrefStream.Entries[idx2];
// Is type xref to compressed object?
if (item.Type == 2)
{
PdfReference irefNew = parser.ReadCompressedObject(new PdfObjectID((int)item.Field2),
(int)item.Field3);
Debug.Assert(document._irefTable.Contains(iref.ObjectID));
//document._irefTable.Add(irefNew);
}
}
}
}
PdfReference[] irefs = document._irefTable.AllReferences;
int count = irefs.Length;
// Read all indirect objects.
for (int idx = 0; idx < count; idx++)
{
PdfReference iref = irefs[idx];
if (iref.Value == null)
{
#if DEBUG_
if (iref.ObjectNumber == 1074)
{
iref.GetType();
}
#endif
try
{
Debug.Assert(document._irefTable.Contains(iref.ObjectID));
PdfObject pdfObject = await parser.ReadObjectAsync(null, iref.ObjectID, false, false);
Debug.Assert(pdfObject.Reference == iref);
pdfObject.Reference = iref;
Debug.Assert(pdfObject.Reference.Value != null, "Something went wrong.");
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
// 4STLA rethrow exception to notify caller.
throw;
}
}
else
{
Debug.Assert(document._irefTable.Contains(iref.ObjectID));
//iref.GetType();
}
// Set maximum object number.
document._irefTable._maxObjectNumber = Math.Max(document._irefTable._maxObjectNumber,
iref.ObjectNumber);
}
// Decrypt all objects.
if (xrefEncrypt != null)
{
document.SecurityHandler.DecryptDocument();
}
// Fix references of trailer values and then objects and irefs are consistent.
document._trailer.Finish();
#if DEBUG_
// Some tests...
PdfReference[] reachables = document.xrefTable.TransitiveClosure(document.trailer);
reachables.GetType();
reachables = document.xrefTable.AllXRefs;
document.xrefTable.CheckConsistence();
#endif
if (openmode == PdfDocumentOpenMode.Modify)
{
// Create new or change existing document IDs.
if (document.Internals.SecondDocumentID == "")
{
document._trailer.CreateNewDocumentIDs();
}
else
{
byte[] agTemp = Guid.NewGuid().ToByteArray();
document.Internals.SecondDocumentID = PdfEncoders.RawEncoding.GetString(agTemp, 0, agTemp.Length);
}
// Change modification date
document.Info.ModificationDate = DateTime.Now;
// Remove all unreachable objects
int removed = document._irefTable.Compact();
if (removed != 0)
{
Debug.WriteLine("Number of deleted unreachable objects: " + removed);
}
// Force flattening of page tree
PdfPages pages = document.Pages;
Debug.Assert(pages != null);
//bool b = document.irefTable.Contains(new PdfObjectID(1108));
//b.GetType();
document._irefTable.CheckConsistence();
document._irefTable.Renumber();
document._irefTable.CheckConsistence();
}
}
#if !DEBUG
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
throw;
}
#endif
return(document);
}
/// <summary>
/// Opens an existing PDF document.
/// </summary>
public static PdfDocument Open(Stream stream, string password, PdfDocumentOpenMode openmode, PdfPasswordProvider passwordProvider)
{
PdfDocument document = null;
try
{
Lexer lexer = new Lexer(stream);
document = new PdfDocument(lexer);
document.state |= DocumentState.Imported;
document.openMode = openmode;
document.fileSize = stream.Length;
// Get file version
byte[] header = new byte[1024];
stream.Position = 0;
stream.Read(header, 0, 1024);
document.version = GetPdfFileVersion(header);
if (document.version == 0)
{
throw new InvalidOperationException(PSSR.InvalidPdf);
}
// Read all trailers
document.irefTable.IsUnderConstruction = true;
Parser parser = new Parser(document);
document.trailer = parser.ReadTrailer();
document.irefTable.IsUnderConstruction = false;
// Is document encrypted?
PdfReference xrefEncrypt = document.trailer.Elements[PdfTrailer.Keys.Encrypt] as PdfReference;
if (xrefEncrypt != null)
{
//xrefEncrypt.Value = parser.ReadObject(null, xrefEncrypt.ObjectID, false);
PdfObject encrypt = parser.ReadObject(null, xrefEncrypt.ObjectID, false);
encrypt.Reference = xrefEncrypt;
xrefEncrypt.Value = encrypt;
PdfStandardSecurityHandler securityHandler = document.SecurityHandler;
TryAgain:
PasswordValidity validity = securityHandler.ValidatePassword(password);
if (validity == PasswordValidity.Invalid)
{
if (passwordProvider != null)
{
PdfPasswordProviderArgs args = new PdfPasswordProviderArgs();
passwordProvider(args);
if (args.Abort)
{
return(null);
}
password = args.Password;
goto TryAgain;
}
else
{
if (password == null)
{
throw new PdfReaderException(PSSR.PasswordRequired);
}
else
{
throw new PdfReaderException(PSSR.InvalidPassword);
}
}
}
else if (validity == PasswordValidity.UserPassword && openmode == PdfDocumentOpenMode.Modify)
{
if (passwordProvider != null)
{
PdfPasswordProviderArgs args = new PdfPasswordProviderArgs();
passwordProvider(args);
if (args.Abort)
{
return(null);
}
password = args.Password;
goto TryAgain;
}
else
{
throw new PdfReaderException(PSSR.OwnerPasswordRequired);
}
}
}
else
{
if (password != null)
{
// Password specified but document is not encrypted.
// ignore
}
}
PdfReference[] irefs = document.irefTable.AllReferences;
int count = irefs.Length;
// Read all indirect objects
for (int idx = 0; idx < count; idx++)
{
PdfReference iref = irefs[idx];
if (iref.Value == null)
{
try
{
Debug.Assert(document.irefTable.Contains(iref.ObjectID));
PdfObject pdfObject = parser.ReadObject(null, iref.ObjectID, false);
Debug.Assert(pdfObject.Reference == iref);
pdfObject.Reference = iref;
Debug.Assert(pdfObject.Reference.Value != null, "something got wrong");
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
else
{
Debug.Assert(document.irefTable.Contains(iref.ObjectID));
iref.GetType();
}
// Set maximum object number
document.irefTable.maxObjectNumber = Math.Max(document.irefTable.maxObjectNumber, iref.ObjectNumber);
}
// Encrypt all objects
if (xrefEncrypt != null)
{
document.SecurityHandler.EncryptDocument();
}
// Fix references of trailer values and then objects and irefs are consistent.
document.trailer.Finish();
#if DEBUG_
// Some tests...
PdfReference[] reachables = document.xrefTable.TransitiveClosure(document.trailer);
reachables.GetType();
reachables = document.xrefTable.AllXRefs;
document.xrefTable.CheckConsistence();
#endif
if (openmode == PdfDocumentOpenMode.Modify)
{
// Create new or change existing document IDs
if (document.Internals.SecondDocumentID == "")
{
document.trailer.CreateNewDocumentIDs();
}
else
{
byte[] agTemp = Guid.NewGuid().ToByteArray();
document.Internals.SecondDocumentID = PdfEncoders.RawEncoding.GetString(agTemp, 0, agTemp.Length);
}
// Change modification date
document.Info.ModificationDate = DateTime.Now;
// Remove all unreachable objects
int removed = document.irefTable.Compact();
if (removed != 0)
{
Debug.WriteLine("Number of deleted unreachable objects: " + removed.ToString());
}
// Force flattening of page tree
PdfPages pages = document.Pages;
//bool b = document.irefTable.Contains(new PdfObjectID(1108));
//b.GetType();
document.irefTable.CheckConsistence();
document.irefTable.Renumber();
document.irefTable.CheckConsistence();
}
}
finally
{
//if (filestream != null)
// filestream.Close();
}
return(document);
}
public int Open(ref string errorMsg)
{
int result = Constants.Failure;
int cryptoMode = 0;
try
{
PdfReader pdfReader = new PdfReader(Info.FullName,
out encryptionRecordInfo.pdfVersion,
out encryptionRecordInfo.documentID,
out encryptionRecordInfo.uValue,
out encryptionRecordInfo.oValue,
out encryptionRecordInfo.pValue,
out encryptionRecordInfo.rValue,
out cryptoMode,
out encryptionRecordInfo.isEncrypted,
out encryptionRecordInfo.keyLength);
if (encryptionRecordInfo.isEncrypted &&
(encryptionRecordInfo.uValue == null || encryptionRecordInfo.oValue == null))
{
errorMsg = "PDF encryption type not supported.";
}
else if (encryptionRecordInfo.isEncrypted)
{
//When using AES encryption, the option is available to refrain from encrypting the metadata.
encryptionRecordInfo.metadataIsEncrypted =
(cryptoMode & PdfWriter.DO_NOT_ENCRYPT_METADATA) != PdfWriter.DO_NOT_ENCRYPT_METADATA;
if ((cryptoMode & PdfWriter.ENCRYPTION_MASK) == PdfWriter.STANDARD_ENCRYPTION_40)
{
encryptionRecordInfo.encryptionType = PdfEncryptionType.StandardEncryption40Bit;
encryptionRecordInfo.metadataIsEncrypted = true;
}
else if ((cryptoMode & PdfWriter.ENCRYPTION_MASK) == PdfWriter.STANDARD_ENCRYPTION_128)
{
encryptionRecordInfo.encryptionType = PdfEncryptionType.StandardEncryption128Bit;
encryptionRecordInfo.metadataIsEncrypted = true;
}
else if ((cryptoMode & PdfWriter.ENCRYPTION_MASK) == PdfWriter.ENCRYPTION_AES_128)
{
encryptionRecordInfo.encryptionType = PdfEncryptionType.AesEncryption128Bit;
}
else if ((cryptoMode & PdfWriter.ENCRYPTION_MASK) == PdfWriter.ENCRYPTION_AES_256)
{
encryptionRecordInfo.encryptionType = PdfEncryptionType.AesEncryption256Bit;
encryptionRecordInfo.MaxPasswordSize = Constants.MaxPasswordSizeV2;
encryptionRecordInfo.PasswordCharset = CharsetEncoding.Unicode;
}
else if ((cryptoMode & PdfWriter.ENCRYPTION_MASK) == PdfWriter.ENCRYPTION_AES_256_ISO)
{
encryptionRecordInfo.encryptionType = PdfEncryptionType.AesIsoEncryption256Bit;
encryptionRecordInfo.MaxPasswordSize = Constants.MaxPasswordSizeV2;
encryptionRecordInfo.PasswordCharset = CharsetEncoding.Unicode;
}
IDecryptor pdfDecryptor = DecryptorFactory.Get(EncryptionRecordInfo);
PasswordValidity passwordValidity = pdfDecryptor.ValidatePassword(string.Empty,
ValidationMode.ValidateUserPassword | ValidationMode.ValidateOwnerPassword);
UserPasswordIsSet =
(passwordValidity & PasswordValidity.UserPasswordIsValid) != PasswordValidity.UserPasswordIsValid;
OwnerPasswordIsSet =
(passwordValidity & PasswordValidity.OwnerPasswordIsValid) != PasswordValidity.OwnerPasswordIsValid;
}
result = Constants.Success;
}
catch (Exception ex)
{
errorMsg = ex.Message;
}
return(result);
}
