public static int CipherKeySize(SymAlgorithms saAlgo)
{
int iKeySize = 0;
switch (saAlgo)
{
case SymAlgorithms.AES128:
iKeySize = 128;
break;
case SymAlgorithms.AES192:
iKeySize = 192;
break;
case SymAlgorithms.AES256:
iKeySize = 256;
break;
case SymAlgorithms.CAST5:
iKeySize = 128;
break;
case SymAlgorithms.Triple_DES:
iKeySize = 192;
break;
}
return(iKeySize);
}
public static SymmetricAlgorithm CreateSymAlgorithm(SymAlgorithms saAlgo)
{
SymmetricAlgorithm saReturn;
switch (saAlgo) {
case SymAlgorithms.AES128:
saReturn = Rijndael.Create();
saReturn.BlockSize = 128;
saReturn.KeySize = 128;
break;
case SymAlgorithms.AES192:
saReturn = Rijndael.Create();
saReturn.BlockSize = 128;
saReturn.KeySize = 192;
break;
case SymAlgorithms.AES256:
saReturn = Rijndael.Create();
saReturn.BlockSize = 128;
saReturn.KeySize = 256;
break;
case SymAlgorithms.CAST5:
saReturn = CAST5.Create();
break;
case SymAlgorithms.Triple_DES:
saReturn = TripleDES.Create();
break;
default:
throw new System.Security.Cryptography.CryptographicException("The algorithm is not supported!");
}
return saReturn;
}
private byte[] EncryptMessage(Message mToBeEncrypted, ulong[] lTargetKeyIDs)
{
CompressedMessage cmMessage = new CompressedMessage();
cmMessage.Compress(mToBeEncrypted);
TransportablePublicKey[] tpkSelectedKeys = new TransportablePublicKey[lTargetKeyIDs.Length];
for (int i = 0; i < lTargetKeyIDs.Length; i++)
{
tpkSelectedKeys[i] = pkrKeyRing.Find(lTargetKeyIDs[i], true);
}
SymAlgorithms saAlgo = GetSymAlgorithmPreferences(tpkSelectedKeys);
SymmetricallyEncryptedDataPacket sedpEncrypted = new SymmetricallyEncryptedDataPacket();
SymmetricAlgorithm saEncrypt = CipherHelper.CreateSymAlgorithm(saAlgo);
saEncrypt.Mode = CipherMode.OpenPGP_CFB;
saEncrypt.GenerateKey();
byte[] bKey = saEncrypt.Key;
ESKSequence esksKeys = new ESKSequence();
esksKeys = CreateESKSequence(tpkSelectedKeys, AsymActions.Encrypt, saAlgo, bKey);
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();
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);
return(bReturn);
}
public static int CipherBlockSize(SymAlgorithms saAlgo)
{
int iBlockSize = 0;
switch (saAlgo) {
case SymAlgorithms.AES128:
case SymAlgorithms.AES192:
case SymAlgorithms.AES256:
iBlockSize = 16;
break;
case SymAlgorithms.CAST5:
iBlockSize = 8;
break;
case SymAlgorithms.Triple_DES:
iBlockSize = 8;
break;
}
return iBlockSize;
}
public static int CipherBlockSize(SymAlgorithms saAlgo)
{
int iBlockSize = 0;
switch (saAlgo)
{
case SymAlgorithms.AES128:
case SymAlgorithms.AES192:
case SymAlgorithms.AES256:
iBlockSize = 16;
break;
case SymAlgorithms.CAST5:
iBlockSize = 8;
break;
case SymAlgorithms.Triple_DES:
iBlockSize = 8;
break;
}
return(iBlockSize);
}
public static int CipherKeySize(SymAlgorithms saAlgo)
{
int iKeySize = 0;
switch (saAlgo) {
case SymAlgorithms.AES128:
iKeySize = 128;
break;
case SymAlgorithms.AES192:
iKeySize = 192;
break;
case SymAlgorithms.AES256:
iKeySize = 256;
break;
case SymAlgorithms.CAST5:
iKeySize = 128;
break;
case SymAlgorithms.Triple_DES:
iKeySize = 192;
break;
}
return iKeySize;
}
public static SymmetricAlgorithm CreateSymAlgorithm(SymAlgorithms saAlgo)
{
SymmetricAlgorithm saReturn;
switch (saAlgo)
{
case SymAlgorithms.AES128:
saReturn = Rijndael.Create();
saReturn.BlockSize = 128;
saReturn.KeySize = 128;
break;
case SymAlgorithms.AES192:
saReturn = Rijndael.Create();
saReturn.BlockSize = 128;
saReturn.KeySize = 192;
break;
case SymAlgorithms.AES256:
saReturn = Rijndael.Create();
saReturn.BlockSize = 128;
saReturn.KeySize = 256;
break;
case SymAlgorithms.CAST5:
saReturn = CAST5.Create();
break;
case SymAlgorithms.Triple_DES:
saReturn = TripleDES.Create();
break;
default:
throw new System.Security.Cryptography.CryptographicException("The algorithm is not supported!");
}
return(saReturn);
}
/// <summary>
/// Parses the packet given as byte array into the current
/// class and returns this with the populated parameters.
/// </summary>
/// <param name="bData">A byte array containing an OpenPGP
/// representation of the packet.</param>
/// <returns>Returns an SecretKeyPacket that containes
/// the parsed properties.</returns>
/// <remarks>No remarks</remarks>
public override Packet ParsePacket(byte[] bData)
{
PublicKey = new PublicKeyPacket();
PublicKey = (PublicKeyPacket)PublicKey.ParsePacket(bData);
int iPos = this.PublicKey.Length;
if (bData[iPos] == 255)
{
this.bIsEncrypted = true;
iPos++;
saSymmetricalAlgorithm = (SymAlgorithms)bData[iPos++];
//String2Key Specifier expected
// a S2K specifier is at max 11 bytes long
byte[] bS2k = new byte[11];
Array.Copy(bData, iPos, bS2k, 0, bS2k.Length);
this.S2KSpecifier.ParseSpecifier(bS2k);
iPos += S2KSpecifier.CraftContent().Length;
//Parse Initial Vector
int iBlockSize = CipherHelper.CipherBlockSize(saSymmetricalAlgorithm);
this.InitialVector = new byte[iBlockSize];
Array.Copy(bData, iPos, bInitialVector, 0, iBlockSize);
iPos += iBlockSize;
//Parse Encrypted MPIs (including checksum!!!)
this.bEncryptedKeyMaterial = new byte[bData.Length - iPos];
Array.Copy(bData, iPos, bEncryptedKeyMaterial, 0, bData.Length - iPos);
}
else if (bData[iPos] == 0)
{
this.bIsEncrypted = false;
iPos++;
//Parse unencrypted MPIs
byte[] bMPIs = new byte[bData.Length - iPos - 2];
Array.Copy(bData, iPos, bMPIs, 0, bMPIs.Length);
biDecryptedKeyMaterial = BigInteger.ParseMPIs(bMPIs);
iPos += bMPIs.Length;
this.sChecksum = (ushort)(bData[iPos++] << 8);
this.sChecksum ^= (ushort)bData[iPos];
//validate checksum
int iCurrentChecksum = 0;
for (int i = 0; i < bMPIs.Length; i++)
{
iCurrentChecksum = (iCurrentChecksum + bMPIs[i]) % 65536;
}
if (iCurrentChecksum != sChecksum)
{
throw(new Exception("Key checksum is not correct. Someone played with the key?!"));
}
}
else
{
//Encrypted in some strange way. We're not going
//to support this
throw(new Exception("This secret key is encrypted in some strange way. Sorry, but we're not going to support this. Get a real key!"));
}
this.bIsUpdated = false;
return(this);
}
private ESKSequence CreateESKSequence(TransportablePublicKey[] tpkKeys, AsymActions aaAction, SymAlgorithms saAlgo, byte[] bSymKey)
{
ESKSequence esksReturn = new ESKSequence();
for (int i = 0; i < tpkKeys.Length; i++)
{
TransportablePublicKey tpkKey = tpkKeys[i];
PublicKeyPacket pkpKey = tpkKey.FindKey(aaAction);
if (pkpKey == null)
{
throw new Exception("Could not find subkey fitting to the selected action. Concerned Key: " + tpkKey.PrimaryUserID);
}
AsymSessionKeyPacket skpKey = new AsymSessionKeyPacket();
skpKey.KeyID = pkpKey.KeyID;
skpKey.PublicAlgorithm = pkpKey.Algorithm;
skpKey.SymmetricAlgorithm = saAlgo;
skpKey.SessionKey = bSymKey;
skpKey.EncryptSessionKey(pkpKey);
esksReturn.AddAsymSessionKey(skpKey);
}
return(esksReturn);
}
/// <summary>
/// Creates a simmetric encrypted sequence
/// </summary>
/// <param name="alKeys">keys to produce the sequence for</param>
/// <param name="aaAction">encrypt/sign</param>
/// <param name="saAlgo">algorithm used</param>
/// <param name="bSymKey">simmetric key</param>
/// <returns>a simmetric encrypted sequence</returns>
private static ESKSequence CreateESKSequence(ArrayList alKeys, AsymActions aaAction, SymAlgorithms saAlgo, byte[] bSymKey)
{
IEnumerator ieKeys = alKeys.GetEnumerator();
ESKSequence esksReturn = new ESKSequence();
while (ieKeys.MoveNext()) {
TransportablePublicKey tpkKey = (TransportablePublicKey)ieKeys.Current;
PublicKeyPacket pkpKey = tpkKey.FindKey(aaAction);
if (pkpKey == null)
throw new Exception("Could not find subkey fitting to the selected action. Concerned Key: " + tpkKey.PrimaryUserID);
AsymSessionKeyPacket skpKey = new AsymSessionKeyPacket();
skpKey.KeyID = pkpKey.KeyID;
skpKey.PublicAlgorithm = pkpKey.Algorithm;
skpKey.SymmetricAlgorithm = saAlgo;
skpKey.SessionKey = bSymKey;
skpKey.EncryptSessionKey(pkpKey);
esksReturn.AddAsymSessionKey(skpKey);
}
return esksReturn;
}
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();
}
private static ESKSequence CreateESKSequence(ArrayList alKeys, AsymActions aaAction, SymAlgorithms saAlgo, byte[] bSymKey)
{
IEnumerator ieKeys = alKeys.GetEnumerator();
ESKSequence esksReturn = new ESKSequence();
while (ieKeys.MoveNext())
{
TransportablePublicKey tpkKey = (TransportablePublicKey)ieKeys.Current;
PublicKeyPacket pkpKey = tpkKey.FindKey(aaAction);
if (pkpKey == null)
{
throw new Exception("Could not find subkey fitting to the selected action. Concerned Key: " + tpkKey.PrimaryUserID);
}
AsymSessionKeyPacket skpKey = new AsymSessionKeyPacket();
skpKey.KeyID = pkpKey.KeyID;
skpKey.PublicAlgorithm = pkpKey.Algorithm;
skpKey.SymmetricAlgorithm = saAlgo;
skpKey.SessionKey = bSymKey;
skpKey.EncryptSessionKey(pkpKey);
esksReturn.AddAsymSessionKey(skpKey);
}
return(esksReturn);
}
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 ESKSequence CreateESKSequence(TransportablePublicKey[] tpkKeys, AsymActions aaAction, SymAlgorithms saAlgo, byte[] bSymKey)
{
ESKSequence esksReturn = new ESKSequence();
for (int i=0; i<tpkKeys.Length; i++) {
TransportablePublicKey tpkKey = tpkKeys[i];
PublicKeyPacket pkpKey = tpkKey.FindKey(aaAction);
if (pkpKey == null)
throw new Exception("Could not find subkey fitting to the selected action. Concerned Key: " + tpkKey.PrimaryUserID);
AsymSessionKeyPacket skpKey = new AsymSessionKeyPacket();
skpKey.KeyID = pkpKey.KeyID;
skpKey.PublicAlgorithm = pkpKey.Algorithm;
skpKey.SymmetricAlgorithm = saAlgo;
skpKey.SessionKey = bSymKey;
skpKey.EncryptSessionKey(pkpKey);
esksReturn.AddAsymSessionKey(skpKey);
}
return esksReturn;
}
/// <summary>
/// Parses the packet given as byte array into the current
/// class and returns this with the populated parameters.
/// </summary>
/// <param name="bData">A byte array containing an OpenPGP
/// representation of the packet.</param>
/// <returns>Returns an SecretKeyPacket that containes
/// the parsed properties.</returns>
/// <remarks>No remarks</remarks>
public override Packet ParsePacket(byte[] bData)
{
PublicKey = new PublicKeyPacket();
PublicKey = (PublicKeyPacket)PublicKey.ParsePacket(bData);
int iPos = this.PublicKey.Length;
if (bData[iPos] == 255) {
this.bIsEncrypted = true;
iPos++;
saSymmetricalAlgorithm = (SymAlgorithms)bData[iPos++];
//String2Key Specifier expected
// a S2K specifier is at max 11 bytes long
byte[] bS2k = new byte[11];
Array.Copy(bData, iPos, bS2k, 0, bS2k.Length);
this.S2KSpecifier.ParseSpecifier(bS2k);
iPos += S2KSpecifier.CraftContent().Length;
//Parse Initial Vector
int iBlockSize = CipherHelper.CipherBlockSize(saSymmetricalAlgorithm);
this.InitialVector = new byte[iBlockSize];
Array.Copy(bData, iPos, bInitialVector, 0, iBlockSize);
iPos += iBlockSize;
//Parse Encrypted MPIs (including checksum!!!)
this.bEncryptedKeyMaterial = new byte[bData.Length - iPos];
Array.Copy(bData, iPos, bEncryptedKeyMaterial, 0, bData.Length - iPos);
} else if (bData[iPos] == 0) {
this.bIsEncrypted = false;
iPos++;
//Parse unencrypted MPIs
byte[] bMPIs = new byte[bData.Length - iPos - 2];
Array.Copy(bData, iPos, bMPIs, 0, bMPIs.Length);
biDecryptedKeyMaterial = BigInteger.ParseMPIs(bMPIs);
iPos += bMPIs.Length;
this.sChecksum = (ushort)(bData[iPos++] << 8);
this.sChecksum ^= (ushort)bData[iPos];
//validate checksum
int iCurrentChecksum = 0;
for (int i=0; i<bMPIs.Length; i++)
iCurrentChecksum = (iCurrentChecksum + bMPIs[i]) % 65536;
if (iCurrentChecksum != sChecksum)
throw(new Exception("Key checksum is not correct. Someone played with the key?!"));
} else {
//Encrypted in some strange way. We're not going
//to support this
throw(new Exception("This secret key is encrypted in some strange way. Sorry, but we're not going to support this. Get a real key!"));
}
this.bIsUpdated = false;
return this;
}
