private static void BobReceiveData(byte[] encryptData)
{
byte[] rawdata = null;
var aes = new AesCryptoServiceProvider();
int nBytes = aes.BlockSize >> 3; // bit to Byte, need to devide 8
byte[] iv = new byte[nBytes];
for (int i = 0; i < iv.Length; i++)
iv[i] = encryptData[i];
using (var bobAlgorithm = new ECDiffieHellmanCng(bobKey))
using (CngKey alicePubKey = CngKey.Import(alicePubKeyBlob, CngKeyBlobFormat.EccPublicBlob))
{
byte[] symmKey = bobAlgorithm.DeriveKeyMaterial(alicePubKey);
Console.WriteLine(Convert.ToBase64String(symmKey));
aes.Key = symmKey;
aes.IV = iv;
}
using (ICryptoTransform decryptor = aes.CreateDecryptor())
using (MemoryStream ms = new MemoryStream())
{
var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write);
cs.Write(encryptData, nBytes, encryptData.Length - nBytes);
cs.Close();
rawdata = ms.ToArray();
Console.WriteLine(Encoding.UTF8.GetString(rawdata));
}
aes.Clear();
}
public string Decription(byte[] encryptedData, byte[] alicePubKeyBlob)
{
byte[] rawData = null;
var aes = new AesCryptoServiceProvider();
int nBytes = aes.BlockSize >> 3;
byte[] iv = new byte[nBytes];
for (int i = 0; i < iv.Length; i++)
iv[i] = encryptedData[i];
using (var bobAlgorithm = new ECDiffieHellmanCng(privKey))
using (CngKey alicePubKey = CngKey.Import(alicePubKeyBlob,
CngKeyBlobFormat.EccPublicBlob))
{
byte[] symmKey = bobAlgorithm.DeriveKeyMaterial(alicePubKey);
aes.Key = symmKey;
aes.IV = iv;
using (ICryptoTransform decryptor = aes.CreateDecryptor())
using (MemoryStream ms = new MemoryStream())
{
var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write);
cs.Write(encryptedData, nBytes, encryptedData.Length - nBytes);
cs.Close();
rawData = ms.ToArray();
}
aes.Clear();
}
return Encoding.UTF8.GetString(rawData);
}
private static byte[] AliceSendData(string msg)
{
Console.WriteLine(string.Format("Alice Send Msg: {0}", msg));
byte[] rawdata = Encoding.UTF8.GetBytes(msg);
byte[] encryptedData = null;
using (var aliceAlgorithm = new ECDiffieHellmanCng(aliceKey))
using (CngKey bobPubKey = CngKey.Import(bobPubKeyBlob, CngKeyBlobFormat.EccPublicBlob))
{
byte[] symmkey = aliceAlgorithm.DeriveKeyMaterial(bobPubKey);
Console.WriteLine(string.Format("Alice Create this symmtric key with {0}", Convert.ToBase64String(symmkey)));
var aes = new AesCryptoServiceProvider();
aes.Key = symmkey;
aes.GenerateIV();
using (ICryptoTransform encryptor = aes.CreateEncryptor())
using (MemoryStream ms = new MemoryStream())
{
var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
ms.Write(aes.IV, 0, aes.IV.Length);
cs.Write(rawdata, 0, rawdata.Length);
cs.Close();
encryptedData = ms.ToArray();
}
aes.Clear();
}
Console.WriteLine(Convert.ToBase64String(encryptedData));
return encryptedData;
}
public byte[] Encription(string message, byte[] bobPubKeyBlob)
{
byte[] rawData = Encoding.UTF8.GetBytes(message);
byte[] encryptedData = null;
using (var aliceAlgorithm = new ECDiffieHellmanCng(privKey))
using (CngKey bobPubKey = CngKey.Import(bobPubKeyBlob,
CngKeyBlobFormat.EccPublicBlob))
{
byte[] symmKey = aliceAlgorithm.DeriveKeyMaterial(bobPubKey);
using (var aes = new AesCryptoServiceProvider())
{
aes.Key = symmKey;
aes.GenerateIV();
using (ICryptoTransform encryptor = aes.CreateEncryptor())
using (MemoryStream ms = new MemoryStream())
{
// create CryptoStream and encrypt data to send
var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
// write initialization vector not encrypted
ms.Write(aes.IV, 0, aes.IV.Length);
cs.Write(rawData, 0, rawData.Length);
cs.Close();
encryptedData = ms.ToArray();
}
aes.Clear();
}
}
return encryptedData;
}
/// <summary>
/// Decrypts a ProcessedPacket.
/// </summary>
/// <param name="InitializationVector">Initialization vec to be used by AES.</param>
/// <param name="PrivateKey">Private key to be used.</param>
/// <param name="PubKeyBlob">Public key blob to be used.</param>
/// <param name="StreamToDecrypt">The stream to decrypt.</param>
/// <returns>A decrypted stream.</returns>
public static byte[] DecryptData(byte[] InitializationVector, CngKey PrivateKey, byte[] PubKeyBlob,
byte[] DataToDecrypt)
{
using (var Algorithm = new ECDiffieHellmanCng(PrivateKey))
{
using (CngKey PubKey = CngKey.Import(PubKeyBlob,
CngKeyBlobFormat.EccPublicBlob))
{
byte[] SymmetricKey = Algorithm.DeriveKeyMaterial(PubKey);
Console.WriteLine("DecryptedStream: Created symmetric key with " +
"public key information: {0}", Convert.ToBase64String(SymmetricKey));
AesCryptoServiceProvider AES = new AesCryptoServiceProvider();
AES.Key = SymmetricKey;
AES.IV = InitializationVector;
int NBytes = AES.BlockSize >> 3; //No idea...
using (ICryptoTransform Decryptor = AES.CreateDecryptor())
{
using (MemoryStream DecryptedStream = new MemoryStream())
{
var cs = new CryptoStream(DecryptedStream, Decryptor, CryptoStreamMode.Write);
cs.Write(DataToDecrypt, NBytes, DataToDecrypt.Length - NBytes);
cs.FlushFinalBlock();
return DecryptedStream.ToArray();
}
}
}
}
}
private static Aes CreateAesForServer(ProgramOptions options, BinaryReader reader, BinaryWriter writer)
{
if (!options.Encrypt) return null;
using (var ke = new ECDiffieHellmanCng())
{
// expecting client's public key
var len = reader.ReadInt32();
byte[] key;
using (var remotePubKey = CngKey.Import(reader.ReadBytes(len), CngKeyBlobFormat.EccPublicBlob))
key = ke.DeriveKeyMaterial(remotePubKey);
var aes = new AesCryptoServiceProvider();
using (var kdf = new Rfc2898DeriveBytes(key, Salt.ToArray(), KdfIterations))
aes.Key = kdf.GetBytes(aes.KeySize / 8);
// send pub key and IV to client
var localPubKey = ke.PublicKey.ToByteArray();
writer.Write(localPubKey.Length);
writer.Write(localPubKey);
writer.Write(aes.IV.Length);
writer.Write(aes.IV);
return aes;
}
}
private async static Task<byte[]> AliceSendsData(string message)
{
Console.WriteLine("Alice send message {0}", message);
byte[] rawData = Encoding.UTF8.GetBytes(message);
byte[] encryptedData = null;
using(var aliceAlgo = new ECDiffieHellmanCng(aliceKey))
{
using(CngKey bobPubKey = CngKey.Import(bobPubKeyBlob, CngKeyBlobFormat.GenericPublicBlob))
{
byte[] symmKey = aliceAlgo.DeriveKeyMaterial(bobPubKey);
Console.WriteLine("Alice create this symm key with Bobs public key information : {0}", Convert.ToBase64String(symmKey));
using(var aes = new AesCryptoServiceProvider())
{
aes.Key = symmKey;
aes.GenerateIV();
using(ICryptoTransform encryptor = aes.CreateEncryptor())
{
using(MemoryStream ms = new MemoryStream())
{
var cs = new CryptoStream(ms, encryptor,CryptoStreamMode.Write);
await ms.WriteAsync(aes.IV, 0, aes.IV.Length);
cs.Write(rawData, 0, rawData.Length);
cs.Close();
encryptedData = ms.ToArray();
}
}
aes.Clear();
}
}
}
Console.WriteLine("Alice message is encrypted : {0}", Convert.ToBase64String(encryptedData));
return encryptedData;
}
/// <summary>
/// Creates an encrypted message
/// </summary>
/// <param name="recipientsEcPublicKey">The public portion of the message recpient's EC key.</param>
/// <param name="plaintextMessageAsByteArray">The message to encrypt.</param>
public EcEncryptedMessageAesCbcHmacSha256(ECDiffieHellmanPublicKey recipientsEcPublicKey, byte[] plaintextMessageAsByteArray)
{
ECDiffieHellmanCng oneTimeEcKey = new ECDiffieHellmanCng(CngKey.Create(CngAlgorithm.ECDiffieHellmanP256, null, new CngKeyCreationParameters()));
PublicOneTimeEcKey = oneTimeEcKey.PublicKey.ToByteArray();
byte[] sessionKey = oneTimeEcKey.DeriveKeyMaterial(recipientsEcPublicKey);
EncryptedMessage = Encryption.EncryptAesCbc(plaintextMessageAsByteArray, sessionKey, addHmac: true);
}
public Bob()
{
using (ECDiffieHellmanCng bob = new ECDiffieHellmanCng())
{
bob.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
bob.HashAlgorithm = CngAlgorithm.Sha256;
bobPublicKey = bob.PublicKey.ToByteArray();
bobKey = bob.DeriveKeyMaterial(CngKey.Import(Alice.alicePublicKey, CngKeyBlobFormat.EccPublicBlob));
}
}
public static byte[] DeriveKeyMaterial(byte[] privateKey, byte[] otherPublicKey, CngAlgorithm hashAlgorithm)
{
#if Mono
throw new NotSupportedException();
#else
using (CngKey ck = CngKey.Import(privateKey, CngKeyBlobFormat.Pkcs8PrivateBlob))
using (ECDiffieHellmanCng ecdh = new ECDiffieHellmanCng(ck))
{
ecdh.HashAlgorithm = hashAlgorithm;
return ecdh.DeriveKeyMaterial(ECDiffieHellmanCngPublicKey.FromXmlString(Encoding.ASCII.GetString(otherPublicKey)));
}
#endif
}
/// <summary>
/// Creates an encrypted message
/// </summary>
/// <param name="recipientsEcPublicKey">The public portion of the message recpient's EC key.</param>
/// <param name="plaintextMessageAsByteArray">The message to encrypt.</param>
public EcEncryptedMessageAesCbcHmacSha256(ECDiffieHellmanPublicKey recipientsEcPublicKey,
byte[] plaintextMessageAsByteArray)
{
byte[] sessionKey;
using (CngKey oneTimeEcCngKey = CngKey.Create(CngAlgorithm.ECDiffieHellmanP256))
{
using (ECDiffieHellmanCng oneTimeEcKey = new ECDiffieHellmanCng(oneTimeEcCngKey))
{
PublicOneTimeEcKey = oneTimeEcKey.PublicKey.ToByteArray();
sessionKey = oneTimeEcKey.DeriveKeyMaterial(recipientsEcPublicKey);
}
}
EncryptedMessage = Encryption.EncryptAesCbc(plaintextMessageAsByteArray, sessionKey, addHmac: true);
}
/// <summary>
/// Decrypt the message by providing the recipient's private EC key.
/// </summary>
/// <param name="recipientsPrivateEcKey">The private EC key matching the public key provided for encryption.</param>
/// <returns>The decrypted message as a byte array</returns>
public byte[] Decrypt(ECDiffieHellmanCng recipientsPrivateEcKey)
{
byte[] sessionKey;
try
{
sessionKey = recipientsPrivateEcKey.DeriveKeyMaterial(CngKey.Import(PublicOneTimeEcKey, CngKeyBlobFormat.EccPublicBlob));
}
catch (CryptographicException e)
{
throw new Exception("Failed to Decrypt log entry", e);
}
return Encryption.DecryptAescbc(EncryptedMessage, sessionKey, checkAndRemoveHmac: true);
}
private static byte[] Generate256BitKey(CngKey ourPvtEcCngKey, X509Certificate2 theirCert)
{
if (ourPvtEcCngKey == null) throw new ArgumentNullException("ourPvtEcCngKey");
var ourEcDh = new ECDiffieHellmanCng(ourPvtEcCngKey)
{
KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash,
HashAlgorithm = CngAlgorithm.Sha256
};
ECDiffieHellmanCngPublicKey theirEcDh = GetECDiffieHellmanCngPublicKey(theirCert);
byte[] symKey = ourEcDh.DeriveKeyMaterial(theirEcDh);
return symKey;
}
private static Aes DeriveKeyAndIv(ECDiffieHellmanCng privateKey, ECDiffieHellmanPublicKey publicKey, byte[] nonce)
{
privateKey.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
privateKey.HashAlgorithm = CngAlgorithm.Sha256;
privateKey.SecretAppend = nonce;
byte[] keyAndIv = privateKey.DeriveKeyMaterial(publicKey);
byte[] key = new byte[16];
Array.Copy(keyAndIv, 0, key, 0, 16);
byte[] iv = new byte[16];
Array.Copy(keyAndIv, 16, iv, 0, 16);
Aes aes = new AesManaged();
aes.Key = key;
aes.IV = iv;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
return aes;
}
public static void Main(string[] args)
{
using (ECDiffieHellmanCng alice = new ECDiffieHellmanCng())
{
//Establish DH shared secret
alice.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
alice.HashAlgorithm = CngAlgorithm.Sha256;
alicePublicKey = alice.PublicKey.ToByteArray();
Bob bob = new Bob();
CngKey k = CngKey.Import(bob.bobPublicKey, CngKeyBlobFormat.EccPublicBlob);
byte[] aliceKey = alice.DeriveKeyMaterial(k);
//share public key info
byte[] encryptedMessage = null;
byte[] iv = null;
Send(aliceKey, "RSA Public key", out encryptedMessage, out iv);
bob.Receive(encryptedMessage, iv);
}
}
private async Task<byte[]> AliceSendsDataAsync(string message)
{
WriteLine($"Alice sends message: {message}");
byte[] rawData = Encoding.UTF8.GetBytes(message);
byte[] encryptedData = null;
using (var aliceAlgorithm = new ECDiffieHellmanCng(_aliceKey))
using (CngKey bobPubKey = CngKey.Import(_bobPubKeyBlob,
CngKeyBlobFormat.EccPublicBlob))
{
byte[] symmKey = aliceAlgorithm.DeriveKeyMaterial(bobPubKey);
WriteLine("Alice creates this symmetric key with " +
$"Bobs public key information: { Convert.ToBase64String(symmKey)}");
using (var aes = new AesCryptoServiceProvider())
{
aes.Key = symmKey;
aes.GenerateIV();
using (ICryptoTransform encryptor = aes.CreateEncryptor())
using (var ms = new MemoryStream())
{
// create CryptoStream and encrypt data to send
using (var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
{
// write initialization vector not encrypted
await ms.WriteAsync(aes.IV, 0, aes.IV.Length);
await cs.WriteAsync(rawData, 0, rawData.Length);
}
encryptedData = ms.ToArray();
}
aes.Clear();
}
}
WriteLine($"Alice: message is encrypted: {Convert.ToBase64String(encryptedData)}"); ;
WriteLine();
return encryptedData;
}
private void Encrypt()
{
if (string.IsNullOrEmpty(DataTextBox.Text))
{
EncryptedDataTextBox.Text = "";
return;
}
EncryptedDataTextBox.Text = "Encrypting...";
try
{
// Import parameters from BLOB.
var keyBlob = System.Convert.FromBase64String(PrivateKeyTextBox.Text);
var privateKey = CngKey.Import(keyBlob, CngKeyBlobFormat.EccPrivateBlob);
var ecdh = new System.Security.Cryptography.ECDiffieHellmanCng(privateKey);
// Encrypt the passed byte array.
var otherPartyKeyBlob = System.Convert.FromBase64String(OtherPublicKeyTextBox.Text);
var otherPartyPublicKey = CngKey.Import(otherPartyKeyBlob, CngKeyBlobFormat.EccPublicBlob);
var symetricKey = ecdh.DeriveKeyMaterial(otherPartyPublicKey);
var symetricKeyBase64 = ToBase64(symetricKey);
var dataBytes = System.Text.Encoding.UTF8.GetBytes(DataTextBox.Text);
// Append random prefix.
dataBytes = AddRandom(dataBytes);
var encryptedBytes = Encrypt(symetricKey, dataBytes);
var encryptedBase64 = ToBase64(encryptedBytes);
// Display the encrypted data.
EncryptedDataTextBox.Foreground = System.Windows.SystemColors.ControlTextBrush;
EncryptedDataTextBox.Text = encryptedBase64;
}
catch (Exception ex)
{
EncryptedDataTextBox.Foreground = new SolidColorBrush(System.Windows.Media.Colors.DarkRed);
EncryptedDataTextBox.Text = ex.Message;
}
}
private void Decrypt()
{
if (string.IsNullOrEmpty(OtherEncryptedDataTextBox.Text))
{
OtherDecryptedTextBox.Text = "";
return;
}
OtherDecryptedTextBox.Text = "Decrypting...";
try
{
var keyBlob = System.Convert.FromBase64String(PrivateKeyTextBox.Text);
var privateKey = CngKey.Import(keyBlob, CngKeyBlobFormat.EccPrivateBlob);
var ecdh = new System.Security.Cryptography.ECDiffieHellmanCng(privateKey);
// Other key
var otherPartyKeyBlob = System.Convert.FromBase64String(OtherPublicKeyTextBox.Text);
var otherPartyPublicKey = CngKey.Import(otherPartyKeyBlob, CngKeyBlobFormat.EccPublicBlob);
// Decrypt the passed byte array and specify OAEP padding.
var symetricKey = ecdh.DeriveKeyMaterial(otherPartyPublicKey);
var symetricKeyBase64 = ToBase64(symetricKey);
var encryptedBytes = System.Convert.FromBase64String(OtherEncryptedDataTextBox.Text);
var decryptedBytes = Decrypt(symetricKey, encryptedBytes);
// Remove random prefix.
decryptedBytes = RemoveRandom(decryptedBytes);
var decryptedData = System.Text.Encoding.UTF8.GetString(decryptedBytes);
OtherDecryptedTextBox.Foreground = System.Windows.SystemColors.ControlTextBrush;
OtherDecryptedTextBox.Text = decryptedData;
}
catch (Exception ex)
{
OtherDecryptedTextBox.Foreground = new SolidColorBrush(System.Windows.Media.Colors.DarkRed);
OtherDecryptedTextBox.Text = ex.Message;
}
}
public void TestCertMangling()
{
string certString = @"MIICSjCCAdECCQDje/no7mXkVzAKBggqhkjOPQQDAjCBjjELMAkGA1UEBhMCVVMx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";
X509Certificate2 c = new X509Certificate2();
c.Import(Convert.FromBase64String(certString));
Assert.AreEqual("[email protected], CN=www.google.com, O=\"Google, Inc\", L=Mountain View, S=California, C=US", c.Issuer);
//Assert.AreEqual("CN=Microsoft Corporate Root CA, O=Microsoft Corporation", c.Subject);
Assert.AreEqual("X509", c.GetFormat());
Assert.AreEqual("1.2.840.10045.2.1", c.GetKeyAlgorithm());
Assert.AreEqual("06052B81040022", c.GetKeyAlgorithmParametersString());
Assert.AreEqual("ECC", c.PublicKey.Oid.FriendlyName);
ECDiffieHellmanPublicKey certKey = CryptoUtils.ImportEccPublicKeyFromCertificate(c);
//Console.WriteLine(certKey.ToXmlString());
// https://blogs.msdn.microsoft.com/shawnfa/2007/01/22/elliptic-curve-diffie-hellman/
// http://stackoverflow.com/questions/11266711/using-cngkey-to-generate-rsa-key-pair-in-pem-dkim-compatible-using-c-simi
{
string input = "eyJhbGciOiJFUzM4NCIsIng1dSI6Ik1IWXdFQVlIS29aSXpqMENBUVlGSzRFRUFDSURZZ0FFN25uWnBDZnhtQ3JTd0RkQnY3ZUJYWE10S2hyb3hPcmlFcjNobU1PSkF1dy9acFFYajFLNUdHdEhTNENwRk50dGQxSllBS1lvSnhZZ2F5a3BpZTBFeUF2M3FpSzZ1dElIMnFuT0F0M1ZOclFZWGZJWkpTL1ZSZTNJbDhQZ3U5Q0IifQo.eyJleHAiOjE0NjQ5ODM4NDUsImV4dHJhRGF0YSI6eyJkaXNwbGF5TmFtZSI6Imd1cnVueCIsImlkZW50aXR5IjoiYWY2ZjdjNWUtZmNlYS0zZTQzLWJmM2EtZTAwNWU0MDBlNTc4In0sImlkZW50aXR5UHVibGljS2V5IjoiTUhZd0VBWUhLb1pJemowQ0FRWUZLNEVFQUNJRFlnQUU3bm5acENmeG1DclN3RGRCdjdlQlhYTXRLaHJveE9yaUVyM2htTU9KQXV3L1pwUVhqMUs1R0d0SFM0Q3BGTnR0ZDFKWUFLWW9KeFlnYXlrcGllMEV5QXYzcWlLNnV0SUgycW5PQXQzVk5yUVlYZklaSlMvVlJlM0lsOFBndTlDQiIsIm5iZiI6MTQ2NDk4Mzg0NH0K.4OrvYYbX09iwOkz-7_N_5yEejuATcUogEbe69fB-kr7r6sH_qSu6bxp9L64SEgABb0rU7tyYCLVnaCSQjd9Dvb34WI9EducgOPJ92qHspcpXr7j716LDfhZE31ksMtWQ";
ECDiffieHellmanPublicKey rootKey = CryptoUtils.CreateEcDiffieHellmanPublicKey("MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE8ELkixyLcwlZryUQcu1TvPOmI2B7vX83ndnWRUaXm74wFfa5f/lwQNTfrLVHa2PmenpGI6JhIMUJaWZrjmMj90NoKNFSNBuKdm8rYiXsfaz3K36x/1U26HpG0ZxK/V1V");
Console.WriteLine($"Root Public Key:\n{rootKey.ToXmlString()}");
CngKey key = CngKey.Import(rootKey.ToByteArray(), CngKeyBlobFormat.EccPublicBlob);
Console.WriteLine("Key family: " + key.AlgorithmGroup);
// "identityPublicKey": "MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE7nnZpCfxmCrSwDdBv7eBXXMtKhroxOriEr3hmMOJAuw/ZpQXj1K5GGtHS4CpFNttd1JYAKYoJxYgaykpie0EyAv3qiK6utIH2qnOAt3VNrQYXfIZJS/VRe3Il8Pgu9CB",
var newKey = CryptoUtils.ImportECDsaCngKeyFromString("MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE7nnZpCfxmCrSwDdBv7eBXXMtKhroxOriEr3hmMOJAuw/ZpQXj1K5GGtHS4CpFNttd1JYAKYoJxYgaykpie0EyAv3qiK6utIH2qnOAt3VNrQYXfIZJS/VRe3Il8Pgu9CB");
string decoded = JWT.Decode(input, newKey);
//Assert.AreEqual("", decoded);
//ECDsaCng t = new ECDsaCng();
//t.HashAlgorithm = CngAlgorithm.ECDiffieHellmanP384;
//t.KeySize = 384;
//byte[] test = t.Key.Export(CngKeyBlobFormat.EccPublicBlob);
//Assert.AreEqual(test, newKey);
//string decoded = JWT.Decode(input, t.Key);
}
// Private key (in reality this is not necessary since we will generate it)
AsymmetricKeyParameter privKey = PrivateKeyFactory.CreateKey(Base64Url.Decode("MB8CAQAwEAYHKoZIzj0CAQYFK4EEACIECDAGAgEBBAEB"));
PrivateKeyInfo privKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privKey);
byte[] derKey = privKeyInfo.GetDerEncoded();
CngKey privCngKey = CngKey.Import(derKey, CngKeyBlobFormat.Pkcs8PrivateBlob);
Console.WriteLine(privKeyInfo.PrivateKeyAlgorithm.Algorithm);
Console.WriteLine(privCngKey.Algorithm.Algorithm);
// Public key
ECDiffieHellmanPublicKey clientKey = CryptoUtils.CreateEcDiffieHellmanPublicKey("MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEDEKneqEvcqUqqFMM1HM1A4zWjJC+I8Y+aKzG5dl+6wNOHHQ4NmG2PEXRJYhujyodFH+wO0dEr4GM1WoaWog8xsYQ6mQJAC0eVpBM96spUB1eMN56+BwlJ4H3Qx4TAvAs");
// EC key to generate shared secret
ECDiffieHellmanCng ecKey = new ECDiffieHellmanCng(privCngKey);
ecKey.HashAlgorithm = CngAlgorithm.Sha256;
ecKey.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
ecKey.SecretPrepend = new byte[128]; // Server token
//ecKey.SecretPrepend = new byte[0]; // Server token
Console.WriteLine(ecKey.HashAlgorithm);
Console.WriteLine(ecKey.KeyExchangeAlgorithm);
byte[] secret = ecKey.DeriveKeyMaterial(clientKey);
Console.WriteLine(Package.HexDump(secret));
Console.WriteLine(Package.HexDump(Base64Url.Decode("ZOBpyzki/M8UZv5tiBih048eYOBVPkQE3r5Fl0gmUP4=")));
Console.WriteLine(Package.HexDump(Base64Url.Decode("DEKneqEvcqUqqFMM1HM1A4zWjJC+I8Y+aKzG5dl+6wNOHHQ4NmG2PEXRJYhujyod")));
//Console.WriteLine(Package.HexDump(Base64Url.Decode("DEKneqEvcqUqqFMM1HM1A4zWjJC+I8Y+aKzG5dl+6wNOHHQ4NmG2PEXRJYhujyod")));
}
public async Task ECAsymmetricSigningAndEncryption()
{
var bob = new ECDsaCng(521);
var bobPublic = CngKey.Import(bob.Key.Export(CngKeyBlobFormat.EccPublicBlob), CngKeyBlobFormat.EccPublicBlob);
var alice = new ECDsaCng(521);
var alicePublic = CngKey.Import(alice.Key.Export(CngKeyBlobFormat.EccPublicBlob), CngKeyBlobFormat.EccPublicBlob);
// Bob formulates request.
var bobRequest = new MemoryStream();
var bobDH = ECDiffieHellman.Create();
{
byte[] bobPublicDH = bobDH.PublicKey.ToByteArray();
byte[] bobSignedDH = bob.SignData(bobPublicDH);
await bobRequest.WriteSizeAndBufferAsync(bobPublicDH, CancellationToken.None);
await bobRequest.WriteSizeAndBufferAsync(bobSignedDH, CancellationToken.None);
bobRequest.Position = 0;
}
// Alice reads request.
var aliceResponse = new MemoryStream();
byte[] aliceKeyMaterial;
var aliceDH = new ECDiffieHellmanCng();
{
byte[] bobPublicDH = await bobRequest.ReadSizeAndBufferAsync(CancellationToken.None);
byte[] bobSignedDH = await bobRequest.ReadSizeAndBufferAsync(CancellationToken.None);
var bobDsa = new ECDsaCng(bobPublic);
Assert.IsTrue(bobDsa.VerifyData(bobPublicDH, bobSignedDH));
var bobDHPK = ECDiffieHellmanCngPublicKey.FromByteArray(bobPublicDH, CngKeyBlobFormat.EccPublicBlob);
aliceKeyMaterial = aliceDH.DeriveKeyMaterial(bobDHPK);
await aliceResponse.WriteSizeAndBufferAsync(aliceDH.PublicKey.ToByteArray(), CancellationToken.None);
await aliceResponse.WriteSizeAndBufferAsync(alice.SignData(aliceDH.PublicKey.ToByteArray()), CancellationToken.None);
// Alice also adds a secret message.
using (var aes = SymmetricAlgorithm.Create())
{
using (var encryptor = aes.CreateEncryptor(aliceKeyMaterial, new byte[aes.BlockSize / 8]))
{
var cipherText = new MemoryStream();
using (var cryptoStream = new CryptoStream(cipherText, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(new byte[] { 0x1, 0x3, 0x2 }, 0, 3);
cryptoStream.FlushFinalBlock();
cipherText.Position = 0;
await aliceResponse.WriteSizeAndStreamAsync(cipherText, CancellationToken.None);
}
}
}
aliceResponse.Position = 0;
}
// Bob reads response
byte[] bobKeyMaterial;
{
byte[] alicePublicDH = await aliceResponse.ReadSizeAndBufferAsync(CancellationToken.None);
byte[] aliceSignedDH = await aliceResponse.ReadSizeAndBufferAsync(CancellationToken.None);
var aliceDsa = new ECDsaCng(alicePublic);
Assert.IsTrue(aliceDsa.VerifyData(alicePublicDH, aliceSignedDH));
var aliceDHPK = ECDiffieHellmanCngPublicKey.FromByteArray(alicePublicDH, CngKeyBlobFormat.EccPublicBlob);
bobKeyMaterial = bobDH.DeriveKeyMaterial(aliceDHPK);
// And Bob reads Alice's secret message.
using (var aes = SymmetricAlgorithm.Create())
{
using (var decryptor = aes.CreateDecryptor(aliceKeyMaterial, new byte[aes.BlockSize / 8]))
{
var plaintext = new MemoryStream();
var substream = await aliceResponse.ReadSizeAndStreamAsync(CancellationToken.None);
using (var cryptoStream = new CryptoStream(substream, decryptor, CryptoStreamMode.Read))
{
await cryptoStream.CopyToAsync(plaintext);
plaintext.Position = 0;
byte[] secretMessage = new byte[1024];
int readBytes = plaintext.Read(secretMessage, 0, secretMessage.Length);
}
}
}
}
CollectionAssert.AreEqual(aliceKeyMaterial, bobKeyMaterial);
}
public void TestGenerateSecret()
{
string keyString = "MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEDEKneqEvcqUqqFMM1HM1A4zWjJC+I8Y+aKzG5dl+6wNOHHQ4NmG2PEXRJYhujyodFH+wO0dEr4GM1WoaWog8xsYQ6mQJAC0eVpBM96spUB1eMN56+BwlJ4H3Qx4TAvAs";
byte[] keyBytes = Base64Url.Decode(keyString);
ECDiffieHellmanPublicKey clientKey = CryptoUtils.CreateEcDiffieHellmanPublicKey(keyString);
ECDiffieHellmanCng ecKey = new ECDiffieHellmanCng(384);
ecKey.HashAlgorithm = CngAlgorithm.Sha256;
ecKey.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
ecKey.SecretPrepend = new byte[128]; // Server token
//ecKey.SecretPrepend = new byte[0]; // Server token
Console.WriteLine(ecKey.HashAlgorithm);
Console.WriteLine(ecKey.KeyExchangeAlgorithm);
byte[] secret = ecKey.DeriveKeyMaterial(clientKey);
}
private async Task BobReceivesDataAsync(byte[] encryptedData)
{
WriteLine("Bob receives encrypted data");
byte[] rawData = null;
var aes = new AesCryptoServiceProvider();
int nBytes = aes.BlockSize >> 3;
byte[] iv = new byte[nBytes];
for (int i = 0; i < iv.Length; i++)
iv[i] = encryptedData[i];
using (var bobAlgorithm = new ECDiffieHellmanCng(_bobKey))
using (CngKey alicePubKey = CngKey.Import(_alicePubKeyBlob,
CngKeyBlobFormat.EccPublicBlob))
{
byte[] symmKey = bobAlgorithm.DeriveKeyMaterial(alicePubKey);
WriteLine("Bob creates this symmetric key with " +
$"Alices public key information: {Convert.ToBase64String(symmKey)}");
aes.Key = symmKey;
aes.IV = iv;
using (ICryptoTransform decryptor = aes.CreateDecryptor())
using (MemoryStream ms = new MemoryStream())
{
using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write))
{
await cs.WriteAsync(encryptedData, nBytes, encryptedData.Length - nBytes);
}
rawData = ms.ToArray();
WriteLine($"Bob decrypts message to: {Encoding.UTF8.GetString(rawData)}");
}
aes.Clear();
}
}
public CallResult KeyExchange_server(string publicKey, string iv)
{
//Initialize a new key provides
this.keyProvider = AuthenticationComponent.getNewKeyProvider();
ECDiffieHellmanPublicKey otherKey = ECDiffieHellmanCngPublicKey.FromByteArray(publicKey.GetBytesBase64(), CngKeyBlobFormat.EccPublicBlob);
//derive connection key from target's public key
var key = keyProvider.DeriveKeyMaterial(otherKey);
ClientConnection.WtlpClient.EncryptionKey = key;
var initVector = iv.GetBytesBase64();
ClientConnection.WtlpClient.EncryptionIV = iv.GetBytesBase64();
//Increase Trust level (connection is now encrypted)
this.ClientConnection.TrustLevel = 2;
this.ClientConnection.MyTrustLevel = 2;
//Send back our own public key so target can derive connection key, too
CallResult result = new ResponseResult(keyProvider.PublicKey.ToByteArray().ToStringBase64());
//once the response has been sent, enable encryption for all following messages
result.PostProcessingAction += delegate { this.ClientConnection.WtlpClient.EncryptMessages = true; };
//Reset key provider
keyProvider = null;
return result;
}
public Task KeyExchangeAsync()
{
return Task.Factory.StartNew(delegate
{
keyProvider = getNewKeyProvider();
this.ClientConnection.WtlpClient.EncryptionIV = new AesCryptoServiceProvider().IV;
var response = (string)ClientConnection.CallRemoteFunction(
ComponentNamesExtended.Authentication,
AuthenticationMethods.KeyExchange,
keyProvider.PublicKey.ToByteArray().ToStringBase64(),
this.ClientConnection.WtlpClient.EncryptionIV.ToStringBase64()
);
ECDiffieHellmanPublicKey otherKey = ECDiffieHellmanCngPublicKey.FromByteArray(response.GetBytesBase64(), CngKeyBlobFormat.EccPublicBlob);
this.ClientConnection.WtlpClient.EncryptionKey = keyProvider.DeriveKeyMaterial(otherKey);
this.ClientConnection.TrustLevel = 2;
this.ClientConnection.MyTrustLevel = 2;
this.ClientConnection.WtlpClient.EncryptMessages = true;
keyProvider = null;
});
}
private static void BobReceivesData(byte[] encryptedData)
{
Console.WriteLine("Bob receives encrypted data");
byte[] rawData = null;
var aes = new AesCryptoServiceProvider();
int nBytes = aes.BlockSize >> 3;
byte[] iv = new byte[nBytes];
for(int i = 0; i < iv.Length; ++i)
{
iv[i] = encryptedData[i];
}
using(var bobAlgro = new ECDiffieHellmanCng(bobKey))
{
using(CngKey alicePubKey = CngKey.Import(alicePubKeyBlod, CngKeyBlobFormat.GenericPublicBlob))
{
byte[] symmKey = bobAlgro.DeriveKeyMaterial(alicePubKey);
Console.WriteLine("Bob creates this symmetric key with ALices public key information : {0}", Convert.ToBase64String(symmKey));
aes.Key = symmKey;
aes.IV = iv;
using(ICryptoTransform decryptor = aes.CreateDecryptor())
{
using(MemoryStream ms = new MemoryStream())
{
var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write);
cs.Write(encryptedData, nBytes, encryptedData.Length - nBytes);
cs.Close();
rawData = ms.ToArray();
Console.WriteLine("Bob decrypts message to {0}", Encoding.UTF8.GetString(rawData));
}
}
}
}
aes.Clear();
}
/// <summary>
/// Both parties are static and authenticated.
/// </summary>
public static byte[] GetSharedDhmSecret(this CngKey privateDhmKey, CngKey publicDhmKey, byte[] contextAppend = null, byte[] contextPrepend = null)
{
using (var ecdh = new ECDiffieHellmanCng(privateDhmKey) { HashAlgorithm = CngAlgorithm.Sha384, SecretAppend = contextAppend, SecretPrepend = contextPrepend })
return ecdh.DeriveKeyMaterial(publicDhmKey);
}
protected void DecodeCert(McpeLogin message)
{
_playerInfo = new PlayerInfo();
// Get bytes
byte[] buffer = message.payload;
if (message.payloadLenght != buffer.Length) throw new Exception($"Wrong lenght {message.payloadLenght} != {message.payload.Length}");
// Decompress bytes
Log.Debug("Lenght: " + message.payloadLenght + ", Message: " + Convert.ToBase64String(buffer));
MemoryStream stream = new MemoryStream(buffer);
if (stream.ReadByte() != 0x78)
{
throw new InvalidDataException("Incorrect ZLib header. Expected 0x78 0x9C");
}
stream.ReadByte();
string certificateChain;
string skinData;
using (var defStream2 = new DeflateStream(stream, CompressionMode.Decompress, false))
{
// Get actual package out of bytes
MemoryStream destination = MiNetServer.MemoryStreamManager.GetStream();
defStream2.CopyTo(destination);
destination.Position = 0;
NbtBinaryReader reader = new NbtBinaryReader(destination, false);
try
{
var countCertData = reader.ReadInt32();
Log.Debug("Count cert: " + countCertData);
certificateChain = Encoding.UTF8.GetString(reader.ReadBytes(countCertData));
Log.Debug("Decompressed certificateChain " + certificateChain);
var countSkinData = reader.ReadInt32();
Log.Debug("Count skin: " + countSkinData);
skinData = Encoding.UTF8.GetString(reader.ReadBytes(countSkinData));
Log.Debug("Decompressed skinData" + skinData);
}
catch (Exception e)
{
Log.Error("Parsing login", e);
return;
}
}
try
{
{
if (Log.IsDebugEnabled) Log.Debug("Input JSON string: " + certificateChain);
dynamic json = JObject.Parse(certificateChain);
if (Log.IsDebugEnabled) Log.Debug($"JSON:\n{json}");
string validationKey = null;
foreach (dynamic o in json.chain)
{
IDictionary<string, dynamic> headers = JWT.Headers(o.ToString());
if (Log.IsDebugEnabled)
{
Log.Debug("Raw chain element:\n" + o.ToString());
Log.Debug($"JWT Header: {string.Join(";", headers)}");
dynamic jsonPayload = JObject.Parse(JWT.Payload(o.ToString()));
Log.Debug($"JWT Payload:\n{jsonPayload}");
}
// x5u cert (string): MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAE8ELkixyLcwlZryUQcu1TvPOmI2B7vX83ndnWRUaXm74wFfa5f/lwQNTfrLVHa2PmenpGI6JhIMUJaWZrjmMj90NoKNFSNBuKdm8rYiXsfaz3K36x/1U26HpG0ZxK/V1V
if (headers.ContainsKey("x5u"))
{
string certString = headers["x5u"];
if (Log.IsDebugEnabled)
{
Log.Debug($"x5u cert (string): {certString}");
ECDiffieHellmanPublicKey publicKey = CryptoUtils.CreateEcDiffieHellmanPublicKey(certString);
Log.Debug($"Cert:\n{publicKey.ToXmlString()}");
}
// Validate
CngKey newKey = CryptoUtils.ImportECDsaCngKeyFromString(certString);
CertificateData data = JWT.Decode<CertificateData>(o.ToString(), newKey);
if (data != null)
{
if (Log.IsDebugEnabled) Log.Debug("Decoded token success");
if (CertificateData.MojangRootKey.Equals(certString, StringComparison.InvariantCultureIgnoreCase))
{
Log.Debug("Got Mojang key. Is valid = " + data.CertificateAuthority);
validationKey = data.IdentityPublicKey;
}
else if (validationKey != null && validationKey.Equals(certString, StringComparison.InvariantCultureIgnoreCase))
{
_playerInfo.CertificateData = data;
}
else
{
// Self signed, make sure they don't fake XUID
if (data.ExtraData.Xuid != null)
{
Log.Warn("Received fake XUID from " + data.ExtraData.DisplayName);
data.ExtraData.Xuid = null;
}
_playerInfo.CertificateData = data;
}
}
else
{
Log.Error("Not a valid Identity Public Key for decoding");
}
}
}
//TODO: Implement disconnect here
{
_playerInfo.Username = _playerInfo.CertificateData.ExtraData.DisplayName;
_session.Username = _playerInfo.Username;
string identity = _playerInfo.CertificateData.ExtraData.Identity;
if (Log.IsDebugEnabled) Log.Debug($"Connecting user {_playerInfo.Username} with identity={identity}");
_playerInfo.ClientUuid = new UUID(new Guid(identity));
_session.CryptoContext = new CryptoContext
{
UseEncryption = Config.GetProperty("UseEncryptionForAll", false) || (Config.GetProperty("UseEncryption", true) && !string.IsNullOrWhiteSpace(_playerInfo.CertificateData.ExtraData.Xuid)),
};
if (_session.CryptoContext.UseEncryption)
{
ECDiffieHellmanPublicKey publicKey = CryptoUtils.CreateEcDiffieHellmanPublicKey(_playerInfo.CertificateData.IdentityPublicKey);
if (Log.IsDebugEnabled) Log.Debug($"Cert:\n{publicKey.ToXmlString()}");
// Create shared shared secret
ECDiffieHellmanCng ecKey = new ECDiffieHellmanCng(384);
ecKey.HashAlgorithm = CngAlgorithm.Sha256;
ecKey.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
ecKey.SecretPrepend = Encoding.UTF8.GetBytes("RANDOM SECRET"); // Server token
byte[] secret = ecKey.DeriveKeyMaterial(publicKey);
if (Log.IsDebugEnabled) Log.Debug($"SECRET KEY (b64):\n{Convert.ToBase64String(secret)}");
{
RijndaelManaged rijAlg = new RijndaelManaged
{
BlockSize = 128,
Padding = PaddingMode.None,
Mode = CipherMode.CFB,
FeedbackSize = 8,
Key = secret,
IV = secret.Take(16).ToArray(),
};
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
MemoryStream inputStream = new MemoryStream();
CryptoStream cryptoStreamIn = new CryptoStream(inputStream, decryptor, CryptoStreamMode.Read);
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
MemoryStream outputStream = new MemoryStream();
CryptoStream cryptoStreamOut = new CryptoStream(outputStream, encryptor, CryptoStreamMode.Write);
_session.CryptoContext.Algorithm = rijAlg;
_session.CryptoContext.Decryptor = decryptor;
_session.CryptoContext.Encryptor = encryptor;
_session.CryptoContext.InputStream = inputStream;
_session.CryptoContext.OutputStream = outputStream;
_session.CryptoContext.CryptoStreamIn = cryptoStreamIn;
_session.CryptoContext.CryptoStreamOut = cryptoStreamOut;
}
var response = McpeServerExchange.CreateObject();
response.NoBatch = true;
response.ForceClear = true;
response.serverPublicKey = Convert.ToBase64String(ecKey.PublicKey.GetDerEncoded());
response.tokenLenght = (short) ecKey.SecretPrepend.Length;
response.token = ecKey.SecretPrepend;
_session.SendPackage(response);
if (Log.IsDebugEnabled) Log.Warn($"Encryption enabled for {_session.Username}");
}
}
}
{
if (Log.IsDebugEnabled) Log.Debug("Input SKIN string: " + skinData);
IDictionary<string, dynamic> headers = JWT.Headers(skinData);
dynamic payload = JObject.Parse(JWT.Payload(skinData));
if (Log.IsDebugEnabled) Log.Debug($"Skin JWT Header: {string.Join(";", headers)}");
if (Log.IsDebugEnabled) Log.Debug($"Skin JWT Payload:\n{payload.ToString()}");
// Skin JWT Payload:
//{
// "ClientRandomId": -1256727416,
// "ServerAddress": "yodamine.com:19132",
// "SkinData": 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// "SkinId": "Standard_Custom"
//}
_playerInfo.ServerAddress = payload.ServerAddress;
_playerInfo.ClientId = payload.ClientRandomId;
_playerInfo.Skin = new Skin()
{
SkinType = payload.SkinId,
Texture = Convert.FromBase64String((string) payload.SkinData),
};
}
if (!_session.CryptoContext.UseEncryption)
{
_session.MessageHandler.HandleMcpeClientMagic(null);
}
}
catch (Exception e)
{
Log.Error("Decrypt", e);
}
}
