/// <summary>
/// Finds a secret key out of the given secret keyring that is able
/// to decrypt the current encrypted message and returns its KeyID.
/// If such a key is not found, 0 is returned.
/// </summary>
/// <param name="skrRing">Secret keyring containing all secret keys
/// known to the system.</param>
/// <returns>Returns the KeyID of the key that is able to decrypt the
/// encrypted message.</returns>
/// <remarks>No remarks</remarks>
public ulong GetFittingKeyID(SecretKeyRing skrRing)
{
bool bFound = false;
IEnumerator ieSessionkeys = esKeys.AsymKeys.GetEnumerator();
while (ieSessionkeys.MoveNext())
{
if (!(ieSessionkeys.Current is AsymSessionKeyPacket))
{
throw new Exception("Strange Error!");
}
AsymSessionKeyPacket askpKey = (AsymSessionKeyPacket)ieSessionkeys.Current;
ulong lKeyID = askpKey.KeyID;
TransportableSecretKey tskKey = skrRing.Find(lKeyID);
if (tskKey != null)
{
return(lKeyID);
}
}
if (!bFound)
{
throw new Exception("No fitting secret key was found to decrypt the message!");
}
return(0);
}
public static string ClearTextSign(string strMessage, SecretKeyRing skrKeyRing)
{
SignaturePacket spSign = new SignaturePacket();
strMessage = Radix64.TrimMessage(strMessage);
QueryPassphrase qpPassphrase = new QueryPassphrase();
qpPassphrase.ShowMyDialog(skrKeyRing);
string strPassphrase = qpPassphrase.Passphrase;
TransportableSecretKey tskKey = qpPassphrase.SelectedKey;
SecretKeyPacket skpKey = tskKey.FindKey(AsymActions.Sign);
Working wWorking = new Working();
wWorking.Show();
spSign.HashAlgorithm = HashAlgorithms.SHA1;
spSign.Format = PacketFormats.New;
wWorking.Progress(10);
SignatureSubPacket sspCreator = new SignatureSubPacket();
sspCreator.Type = SignatureSubPacketTypes.IssuerKeyID;
sspCreator.KeyID = skpKey.PublicKey.KeyID;
SignatureSubPacket sspCreationTime = new SignatureSubPacket();
sspCreationTime.Type = SignatureSubPacketTypes.SignatureCreationTime;
sspCreationTime.TimeCreated = DateTime.Now;
spSign.HashedSubPackets = new SignatureSubPacket[2];
spSign.HashedSubPackets[0] = sspCreator;
spSign.HashedSubPackets[1] = sspCreationTime;
wWorking.Progress(20);
//spSign.KeyID = skpKey.PublicKey.KeyID;
//spSign.TimeCreated = DateTime.Now;
spSign.SignatureAlgorithm = skpKey.PublicKey.Algorithm;
spSign.SignatureType = SignatureTypes.TextSignature;
spSign.Version = SignaturePacketVersionNumbers.v4;
wWorking.Progress(10);
byte[] bMessage = System.Text.Encoding.UTF8.GetBytes(strMessage);
spSign.Sign(bMessage, skpKey, strPassphrase);
wWorking.Progress(40);
byte[] bSignature = spSign.Generate();
string strSignature = Radix64.Encode(bSignature, true);
wWorking.Progress(20);
string strFinal = Armor.WrapCleartextSignature(strMessage, strSignature);
wWorking.Hide();
return strFinal;
}
/// <summary>
/// Decrypts the current encrypted message using the secret keys
/// in skrKeyRing and the given passphrase.
/// </summary>
/// <param name="skrKeyRing">The secret keyring containing all the
/// secret keys know to the sytem.</param>
/// <param name="strPassphrase">The passphrase that was used to
/// encrypt the secret key material in the key that decrypts
/// the message.</param>
/// <returns>Returns the message that was encrypted. Usually this is
/// an compressed or literal message.</returns>
/// <remarks>No remarks</remarks>
public Message Decrypt(SecretKeyRing skrKeyRing, string strPassphrase)
{
TransportableSecretKey tskSecretKey = new TransportableSecretKey();
AsymSessionKeyPacket askpSessionKey = new AsymSessionKeyPacket();
bool bFound = false;
// let's see, if we can find a fitting Sessionkey packet
IEnumerator ieSessionkeys = esKeys.AsymKeys.GetEnumerator();
while (ieSessionkeys.MoveNext())
{
if (!(ieSessionkeys.Current is AsymSessionKeyPacket))
{
throw new Exception("Strange Error!");
}
AsymSessionKeyPacket askpKey = (AsymSessionKeyPacket)ieSessionkeys.Current;
ulong lKeyID = askpKey.KeyID;
TransportableSecretKey tskKey = skrKeyRing.Find(lKeyID);
if (tskKey != null)
{
bFound = true;
tskSecretKey = tskKey;
askpSessionKey = askpKey;
}
}
if (!bFound)
{
throw new Exception("No fitting secret key was found to decrypt the message!");
}
askpSessionKey.DecryptSessionKey(tskSecretKey, strPassphrase);
byte[] bKey = askpSessionKey.SessionKey;
Packet[] pContent = new Packet[0];
try {
SymmetricAlgorithm saAlgo = CipherHelper.CreateSymAlgorithm(askpSessionKey.SymmetricAlgorithm);
pContent = sepData.Decrypt(bKey, saAlgo);
} catch (Exception e) {
throw new System.Exception("Decryption of the Message failed: " + e.Message);
}
// now we need to look what kind of message was hidden in the
// encrypted data
// it can be either a literal message
LiteralMessage lmLiteral = new LiteralMessage();
try {
int iPos = lmLiteral.ParseMessage(pContent);
return(lmLiteral);
} catch (Exception) {}
// or an compressed Message
CompressedMessage cmCompressed = new CompressedMessage();
try {
int iPos = cmCompressed.ParseMessage(pContent);
return(cmCompressed);
} catch (Exception) {}
throw new System.ArgumentException("Encrypted package content is not a valid message!");
}
public static string EncryptText(string strMessage, PublicKeyRing pkrPublicKeyRing, SecretKeyRing skrSecretKeyRing, bool bSign)
{
PublicKeySelector pksSelectKeys = new PublicKeySelector(pkrPublicKeyRing);
pksSelectKeys.ShowDialog();
TransportableSecretKey tskKey = new TransportableSecretKey();
string strPassphrase = "";
if (bSign) {
QueryPassphrase qpPassphrase = new QueryPassphrase();
qpPassphrase.ShowMyDialog(skrSecretKeyRing);
tskKey = qpPassphrase.SelectedKey;
strPassphrase = qpPassphrase.Passphrase;
}
if (pksSelectKeys.SelectedKeys.Count == 0)
return strMessage;
Working wWorking = new Working();
wWorking.Show();
LiteralMessage lmMessage = new LiteralMessage(DataFormatTypes.Text);
lmMessage.Text = strMessage;
lmMessage.TimeCreated = DateTime.Now;
lmMessage.Filename = "";
SharpPrivacy.OpenPGP.Messages.Message mEncryptionMessage = lmMessage;
if (bSign) {
SignedMessage smMessage = new SignedMessage();
smMessage.MessageSigned = lmMessage;
SignaturePacket spPacket = new SignaturePacket();
spPacket.Version = SignaturePacketVersionNumbers.v3;
SecretKeyPacket skpKey = tskKey.FindKey(AsymActions.Sign);
spPacket.KeyID = skpKey.PublicKey.KeyID;
spPacket.HashAlgorithm = HashAlgorithms.SHA1;
spPacket.SignatureAlgorithm = skpKey.PublicKey.Algorithm;
spPacket.TimeCreated = DateTime.Now;
spPacket.SignatureType = SignatureTypes.TextSignature;
spPacket.Sign(lmMessage.Binary, skpKey, strPassphrase);
smMessage.Signature = spPacket;
mEncryptionMessage = smMessage;
}
CompressedMessage cmMessage = new CompressedMessage();
cmMessage.Compress(mEncryptionMessage);
wWorking.Progress(20);
SymAlgorithms saAlgo = GetSymAlgorithmPreferences(pksSelectKeys.SelectedKeys);
SymmetricallyEncryptedDataPacket sedpEncrypted = new SymmetricallyEncryptedDataPacket();
SymmetricAlgorithm saEncrypt = CipherHelper.CreateSymAlgorithm(saAlgo);
saEncrypt.Mode = CipherMode.OpenPGP_CFB;
saEncrypt.GenerateKey();
byte[] bKey = saEncrypt.Key;
wWorking.Progress(10);
ESKSequence esksKeys = new ESKSequence();
try {
esksKeys = CreateESKSequence(pksSelectKeys.SelectedKeys, AsymActions.Encrypt, saAlgo, bKey);
} catch (Exception e) {
wWorking.Hide();
MessageBox.Show("The following error occured: " + e.Message, "Error...");
return strMessage;
}
wWorking.Progress(50);
ICryptoTransform ictEncryptor = saEncrypt.CreateEncryptor();
byte[] bMessage = cmMessage.GetEncoded();
byte[] bOutput = new byte[bMessage.Length];
ictEncryptor.TransformBlock(bMessage, 0, bMessage.Length, ref bOutput, 0);
bKey.Initialize();
wWorking.Progress(10);
int iOutLength = (saEncrypt.BlockSize >> 3) + 2 + bMessage.Length;
sedpEncrypted.Body = new byte[iOutLength];
Array.Copy(bOutput, 0, sedpEncrypted.Body, 0, iOutLength);
byte[] bESK = esksKeys.GetEncoded();
byte[] bEncrypted = sedpEncrypted.Generate();
byte[] bReturn = new byte[bESK.Length + bEncrypted.Length];
bESK.CopyTo(bReturn, 0);
bEncrypted.CopyTo(bReturn, bESK.Length);
wWorking.Progress(10);
string strReturn = Radix64.Encode(bReturn, true);
strReturn = Armor.WrapMessage(strReturn);
wWorking.Hide();
return strReturn;
}
private static void DecryptAndVerify(SecretKeyRing skrSecretKeyRing, PublicKeyRing pkrPublicKeyRing, byte[] bData)
{
string strMessage = System.Text.Encoding.UTF8.GetString(bData);
ArmorTypes atType = new ArmorTypes();
string strRest = "";
string strRadix64 = Armor.RemoveArmor(strMessage, ref atType, ref strRest);
if (strRadix64.Length > 0)
bData = Radix64.Decode(strRadix64);
SharpPrivacy.OpenPGP.Messages.Message mContent = null;
if (atType == ArmorTypes.OpenPGPSignature) {
string strSignature = "";
string strSignedMessage = Armor.RemoveClearSignatureArmor(strMessage, ref atType, ref strSignature);
strSignedMessage = Radix64.DashUnescape(strSignedMessage);
strSignedMessage = Radix64.TrimMessage(strSignedMessage);
SignedMessage smMessage = new SignedMessage();
Packet[] pPackets = Packet.ParsePackets(strSignature);
if (!(pPackets[0] is SignaturePacket)) {
MessageBox.Show("Not a valid cleartext signature!");
return;
}
smMessage.Signature = (SignaturePacket)pPackets[0];
LiteralMessage lmMessage = new LiteralMessage(DataFormatTypes.Text);
lmMessage.Text = strSignedMessage;
smMessage.MessageSigned = lmMessage;
mContent = smMessage;
} else {
// let us see what kind of message this is
EncryptedMessage emMessage = new EncryptedMessage();
try {
Packet[] pPackets = Packet.ParsePackets(bData);
emMessage.ParseMessage(pPackets);
if (emMessage.SymmetricallyEncrypted) {
// Query passphrase for symmetrically encrypted message
QueryPassphrase qpPassphrase = new QueryPassphrase();
qpPassphrase.ShowMyDialog();
string strPassphrase = qpPassphrase.Passphrase;
mContent = emMessage.Decrypt(strPassphrase);
} else {
ulong lKeyID = emMessage.GetFittingKeyID(skrSecretKeyRing);
QueryPassphrase qpPassphrase = new QueryPassphrase();
qpPassphrase.ShowMyDialog(skrSecretKeyRing.Find(lKeyID));
string strPassphrase = qpPassphrase.Passphrase;
mContent = emMessage.Decrypt(skrSecretKeyRing, strPassphrase);
}
while ((!(mContent is LiteralMessage)) && (!(mContent is SignedMessage))) {
if (mContent is CompressedMessage) {
mContent = ((CompressedMessage)mContent).Uncompress();
} else {
MessageBox.Show("This is not a valid OpenPGP message!");
return;
}
}
} catch (Exception ee) {
MessageBox.Show("There was an error decrypting your message: " + ee.Message);
return;
}
}
LiteralMessage lmContent = new LiteralMessage();
string strDisplay = "";
if (mContent is SignedMessage) {
SignedMessage smContent = (SignedMessage)mContent;
lmContent = smContent.MessageSigned;
strDisplay += "*** OpenPGP Signed Message ***\r\n";
strDisplay += "*** Signature Status: " + smContent.Verify(pkrPublicKeyRing) + " ***\r\n";
strDisplay += "*** Signing Key: " + smContent.Signature.KeyID.ToString("x") + " ***\r\n";
strDisplay += "*** Signing Date: " + smContent.Signature.TimeCreated.ToString() + "***\r\n\r\n";
} else if (mContent is LiteralMessage) {
lmContent = (LiteralMessage)mContent;
strDisplay += "*** OpenPGP Encrypted Message ***\r\n\r\n";
} else {
MessageBox.Show("An error occured: Could not find an encrypted or signed message!", "Error...");
return;
}
if (lmContent.DataFormat == DataFormatTypes.Text) {
strDisplay += lmContent.Text;
strDisplay += "\r\n\r\n*** End OpenPGP Message ***\r\n";
PlaintextViewer pvViewer = new PlaintextViewer();
pvViewer.MessageText = strDisplay;
pvViewer.Show();
} else {
if (MessageBox.Show(strDisplay, "Signature Status...", MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk, MessageBoxDefaultButton.Button1) == DialogResult.OK) {
System.Windows.Forms.SaveFileDialog sfdSave = new SaveFileDialog();
sfdSave.OverwritePrompt = true;
sfdSave.Filter = "All Files (*.*)|*.*";
sfdSave.FileName = lmContent.Filename;
sfdSave.ShowDialog();
if (sfdSave.FileName.Length > 0) {
System.IO.FileStream fsOut = new FileStream(sfdSave.FileName, FileMode.CreateNew);
System.IO.BinaryWriter bwOut = new BinaryWriter(fsOut);
bwOut.Write(lmContent.Binary);
bwOut.Close();
fsOut.Close();
}
}
}
}
public static void EncryptFiles(String[] strFiles, PublicKeyRing pkrPublicKeyRing, SecretKeyRing skrSecretKeyRing, bool bEncrypt, bool bSign)
{
PublicKeySelector pksSelectKeys = new PublicKeySelector(pkrPublicKeyRing);
if (bEncrypt) {
pksSelectKeys.ShowDialog();
if (pksSelectKeys.SelectedKeys.Count == 0) {
MessageBox.Show("You did not select a public key to encrypt to. Doing nothing...", "Nothing Done...");
return;
}
}
TransportableSecretKey tskKey = new TransportableSecretKey();
string strPassphrase = "";
if (bSign) {
QueryPassphrase qpPassphrase = new QueryPassphrase();
qpPassphrase.ShowMyDialog(skrSecretKeyRing);
tskKey = qpPassphrase.SelectedKey;
strPassphrase = qpPassphrase.Passphrase;
}
Working wWorking = new Working();
wWorking.Show();
for (int i=0; i<strFiles.Length; i++) {
byte[] bFileContent = new byte[0];
try {
System.IO.FileStream fsFile = new FileStream(strFiles[i], FileMode.Open);
BinaryReader brReader = new BinaryReader(fsFile);
bFileContent = brReader.ReadBytes((int)fsFile.Length);
brReader.Close();
fsFile.Close();
} catch (Exception e) {
wWorking.Hide();
MessageBox.Show("An error occured while opening the file " + strFiles[i] + ": " + e.Message, "Error...");
return;
}
LiteralMessage lmMessage = new LiteralMessage(DataFormatTypes.Binary);
lmMessage.Binary = bFileContent;
lmMessage.TimeCreated = DateTime.Now;
int iLastBackslash = strFiles[i].LastIndexOf("\\");
lmMessage.Filename = strFiles[i].Substring(iLastBackslash + 1, strFiles[i].Length - iLastBackslash - 1);
SharpPrivacy.OpenPGP.Messages.Message mEncryptionMessage = lmMessage;
if (bSign) {
SignedMessage smMessage = new SignedMessage();
smMessage.MessageSigned = lmMessage;
SignaturePacket spPacket = new SignaturePacket();
spPacket.Version = SignaturePacketVersionNumbers.v3;
SecretKeyPacket skpKey = tskKey.FindKey(AsymActions.Sign);
spPacket.KeyID = skpKey.PublicKey.KeyID;
spPacket.HashAlgorithm = HashAlgorithms.SHA1;
spPacket.SignatureAlgorithm = skpKey.PublicKey.Algorithm;
spPacket.TimeCreated = DateTime.Now;
spPacket.SignatureType = SignatureTypes.TextSignature;
spPacket.Sign(lmMessage.Binary, skpKey, strPassphrase);
smMessage.Signature = spPacket;
mEncryptionMessage = smMessage;
}
CompressedMessage cmMessage = new CompressedMessage();
cmMessage.Compress(mEncryptionMessage);
wWorking.Progress(20/strFiles.Length);
SymAlgorithms saAlgo = GetSymAlgorithmPreferences(pksSelectKeys.SelectedKeys);
wWorking.Progress(10/strFiles.Length);
byte[] bReturn = new byte[0];
if (bEncrypt) {
SymmetricallyEncryptedDataPacket sedpEncrypted = new SymmetricallyEncryptedDataPacket();
SymmetricAlgorithm saEncrypt = CipherHelper.CreateSymAlgorithm(saAlgo);
saEncrypt.Mode = CipherMode.OpenPGP_CFB;
saEncrypt.GenerateKey();
byte[] bKey = saEncrypt.Key;
ESKSequence esksKeys = new ESKSequence();
try {
esksKeys = CreateESKSequence(pksSelectKeys.SelectedKeys, AsymActions.Encrypt, saAlgo, bKey);
} catch (Exception e) {
wWorking.Hide();
MessageBox.Show("The following error occured: " + e.Message, "Error...");
return;
}
wWorking.Progress(50/strFiles.Length);
ICryptoTransform ictEncryptor = saEncrypt.CreateEncryptor();
byte[] bMessage = cmMessage.GetEncoded();
byte[] bOutput = new byte[bMessage.Length];
ictEncryptor.TransformBlock(bMessage, 0, bMessage.Length, ref bOutput, 0);
bKey.Initialize();
wWorking.Progress(10/strFiles.Length);
int iOutLength = (saEncrypt.BlockSize >> 3) + 2 + bMessage.Length;
sedpEncrypted.Body = new byte[iOutLength];
Array.Copy(bOutput, 0, sedpEncrypted.Body, 0, iOutLength);
byte[] bESK = esksKeys.GetEncoded();
byte[] bEncrypted = sedpEncrypted.Generate();
bReturn = new byte[bESK.Length + bEncrypted.Length];
bESK.CopyTo(bReturn, 0);
bEncrypted.CopyTo(bReturn, bESK.Length);
} else {
wWorking.Progress(60/strFiles.Length);
bReturn = cmMessage.GetEncoded();
}
wWorking.Progress(10/strFiles.Length);
try {
FileStream fsOut = new FileStream(strFiles[i] + ".asc", FileMode.CreateNew);
BinaryWriter bwWrite = new BinaryWriter(fsOut);
bwWrite.Write(bReturn);
bwWrite.Close();
fsOut.Close();
} catch (IOException io) {
MessageBox.Show("Could not write to file. The following error occured: " + io.Message, "Error...");
}
}
wWorking.Hide();
}
public static void DecryptAndVerifyText(SecretKeyRing skrSecretKeyRing, PublicKeyRing pkrPublicKeyRing, string strMessage)
{
byte[] bData = new byte[strMessage.Length];
bData = System.Text.Encoding.UTF8.GetBytes(strMessage);
DecryptAndVerify(skrSecretKeyRing, pkrPublicKeyRing, bData);
}
public static void DecryptAndVerifyFile(SecretKeyRing skrSecretKeyRing, PublicKeyRing pkrPublicKeyRing, string strFile)
{
System.IO.FileStream fsIn = new FileStream(strFile, FileMode.Open);
System.IO.BinaryReader brIn = new BinaryReader(fsIn);
byte[] bData = new byte[fsIn.Length];
brIn.Read(bData, 0, bData.Length);
DecryptAndVerify(skrSecretKeyRing, pkrPublicKeyRing, bData);
}
/// <summary>
/// Finds a secret key out of the given secret keyring that is able
/// to decrypt the current encrypted message and returns its KeyID.
/// If such a key is not found, 0 is returned.
/// </summary>
/// <param name="skrRing">Secret keyring containing all secret keys
/// known to the system.</param>
/// <returns>Returns the KeyID of the key that is able to decrypt the
/// encrypted message.</returns>
/// <remarks>No remarks</remarks>
public ulong GetFittingKeyID(SecretKeyRing skrRing)
{
bool bFound = false;
IEnumerator ieSessionkeys = esKeys.AsymKeys.GetEnumerator();
while (ieSessionkeys.MoveNext()) {
if (!(ieSessionkeys.Current is AsymSessionKeyPacket))
throw new Exception("Strange Error!");
AsymSessionKeyPacket askpKey = (AsymSessionKeyPacket)ieSessionkeys.Current;
ulong lKeyID = askpKey.KeyID;
TransportableSecretKey tskKey = skrRing.Find(lKeyID);
if (tskKey != null) {
return lKeyID;
}
}
if (!bFound)
throw new Exception("No fitting secret key was found to decrypt the message!");
return 0;
}
/// <summary>
/// Decrypts the current encrypted message using the secret keys
/// in skrKeyRing and the given passphrase.
/// </summary>
/// <param name="skrKeyRing">The secret keyring containing all the
/// secret keys know to the sytem.</param>
/// <param name="strPassphrase">The passphrase that was used to
/// encrypt the secret key material in the key that decrypts
/// the message.</param>
/// <returns>Returns the message that was encrypted. Usually this is
/// an compressed or literal message.</returns>
/// <remarks>No remarks</remarks>
public Message Decrypt(SecretKeyRing skrKeyRing, string strPassphrase)
{
TransportableSecretKey tskSecretKey = new TransportableSecretKey();
AsymSessionKeyPacket askpSessionKey = new AsymSessionKeyPacket();
bool bFound = false;
// let's see, if we can find a fitting Sessionkey packet
IEnumerator ieSessionkeys = esKeys.AsymKeys.GetEnumerator();
while (ieSessionkeys.MoveNext()) {
if (!(ieSessionkeys.Current is AsymSessionKeyPacket))
throw new Exception("Strange Error!");
AsymSessionKeyPacket askpKey = (AsymSessionKeyPacket)ieSessionkeys.Current;
ulong lKeyID = askpKey.KeyID;
TransportableSecretKey tskKey = skrKeyRing.Find(lKeyID);
if (tskKey != null) {
bFound = true;
tskSecretKey = tskKey;
askpSessionKey = askpKey;
}
}
if (!bFound)
throw new Exception("No fitting secret key was found to decrypt the message!");
askpSessionKey.DecryptSessionKey(tskSecretKey, strPassphrase);
byte[] bKey = askpSessionKey.SessionKey;
Packet[] pContent = new Packet[0];
try {
SymmetricAlgorithm saAlgo = CipherHelper.CreateSymAlgorithm(askpSessionKey.SymmetricAlgorithm);
pContent = sepData.Decrypt(bKey, saAlgo);
} catch (Exception e) {
throw new System.Exception("Decryption of the Message failed: " + e.Message);
}
// now we need to look what kind of message was hidden in the
// encrypted data
// it can be either a literal message
LiteralMessage lmLiteral = new LiteralMessage();
try {
int iPos = lmLiteral.ParseMessage(pContent);
return lmLiteral;
} catch (Exception) {}
// or an compressed Message
CompressedMessage cmCompressed = new CompressedMessage();
try {
int iPos = cmCompressed.ParseMessage(pContent);
return cmCompressed;
} catch (Exception) {}
throw new System.ArgumentException("Encrypted package content is not a valid message!");
}