static bool GetAES(ref byte[] data, BlindSocket socket, out Cryptography.AES256 aes256)
{
aes256 = null;
uint encryptDate = BitConverter.ToUInt32(data, 4);
byte[] realData = new byte[data.Length - 8];
Array.Copy(data, 8, realData, 0, realData.Length);
data = realData;
Console.WriteLine("Encrypted date : " + encryptDate);
socket.CryptoSend(BitConverter.GetBytes(encryptDate), PacketType.Info);
byte[] key = socket.CryptoReceiveMsg();
if (key == null)
{
MessageBox.Show("파일 복호화에 실패했습니다.", "파일 열기");
return(false);
}
Console.WriteLine("Received key {0} bytes", key.Length);
byte[] iv = socket.CryptoReceiveMsg();
if (iv == null)
{
MessageBox.Show("파일 복호화에 실패했습니다.", "파일 열기");
return(false);
}
Console.WriteLine("Received iv {0} bytes", iv.Length);
aes256 = new Cryptography.AES256(key, iv);
return(true);
}
private byte[] DecryptFile(byte[] data)
{
byte[] fileData = new byte[data.Length - 8];
Array.Copy(data, 8, fileData, 0, fileData.Length);
uint encryptDate = BitConverter.ToUInt32(data, 4);
string command = "SELECT _key, iv FROM crypto_key WHERE apply_date <= '" + encryptDate +
"' AND expire_date > '" + encryptDate + "'; ";
MySqlDataAdapter adapter = new MySqlDataAdapter(command, connection);
DataSet dataset = new DataSet();
adapter.Fill(dataset);
if (dataset.Tables[0].Rows.Count != 1)
{
return(null);
}
Cryptography.AES256 aes256 = new Cryptography.AES256((byte[])(dataset.Tables[0].Rows[0]["_key"]), (byte[])(dataset.Tables[0].Rows[0]["iv"]));
try
{
return(aes256.Decryption(fileData));
}
catch (Exception ex)
{
return(null);
}
}
public bool ConnectWithECDH(string ip = BlindNetConst.ServerIP, int port = BlindNetConst.MAINPORT)
{
Connect(ip, port);
aes = ECDH_Client();
if (aes == null)
{
return(false);
}
return(true);
}
public async Task <bool> ConnectWithECDHAsync(string ip = BlindNetConst.ServerIP, int port = BlindNetConst.MAINPORT)
{
await Task.Run(() => Connect(ip, port));
aes = ECDH_Client();
if (aes == null)
{
return(false);
}
return(true);
}
private BlindSocket ECDH_Server(Socket socket)
{
if (socket == null)
{
return(null);
}
Cryptography.AES256 aes;
BlindSocket clientSock;
using (ECDiffieHellmanCng dh = new ECDiffieHellmanCng())
{
dh.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
dh.HashAlgorithm = CngAlgorithm.Sha256;
byte[] publicKey = dh.PublicKey.ToByteArray();
socket.Send(publicKey, publicKey.Length, SocketFlags.None);
byte[] sharekey = new byte[publicKey.Length];
socket.Receive(sharekey, publicKey.Length, SocketFlags.None);
byte[] key = dh.DeriveKeyMaterial(CngKey.Import(sharekey, CngKeyBlobFormat.EccPublicBlob));
aes = new Cryptography.AES256(key);
clientSock = new BlindSocket(socket, aes);
}
for (int i = 1; ; i++)
{
byte[] prevIv = aes.aes.IV;
aes.aes.GenerateIV();
byte[] newIv = aes.aes.IV;
aes.aes.IV = prevIv;
clientSock.CryptoSend(newIv, PacketType.Info);
byte[] iv = clientSock.CryptoReceiveMsg();
if (!newIv.SequenceEqual(iv))
{
if (i < BlindNetConst.MAXRETRY)
{
clientSock.CryptoSend(null, PacketType.Retry);
}
else
{
clientSock.CryptoSend(null, PacketType.Fail);
return(null);
}
}
else
{
clientSock.CryptoSend(null, PacketType.OK);
aes.aes.IV = newIv;
break;
}
}
return(clientSock);
}
private BlindSocket ECDH_Server(Socket socket)
{
if (socket == null)
{
return(null);
}
Cryptography.AES256 aes;
BlindSocket clientSock;
using (ECDiffieHellmanCng dh = new ECDiffieHellmanCng())
{
dh.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
dh.HashAlgorithm = CngAlgorithm.Sha256;
byte[] publicKey = dh.PublicKey.ToByteArray();
socket.Send(publicKey, publicKey.Length, SocketFlags.None);
byte[] sharekey = new byte[publicKey.Length];
socket.Receive(sharekey, publicKey.Length, SocketFlags.None);
byte[] key = dh.DeriveKeyMaterial(CngKey.Import(sharekey, CngKeyBlobFormat.EccPublicBlob));
aes = new Cryptography.AES256(key);
clientSock = new BlindSocket(socket, aes);
}
for (int i = 1; ; i++)
{
string testTxt = BlindNetUtil.GetRandomString(BlindNetConst.MINRNDTXT, BlindNetConst.MAXRNDTXT);
clientSock.CryptoSend(Encoding.UTF8.GetBytes(testTxt), PacketType.MSG);
var pack = clientSock.CryptoReceive();
string recvTxt = Encoding.UTF8.GetString(pack.data).TrimEnd('\0');
if (recvTxt != testTxt)
{
if (i < BlindNetConst.MAXRETRY)
{
clientSock.CryptoSend(null, PacketType.Retry);
}
else
{
clientSock.CryptoSend(null, PacketType.Fail);
return(null);
}
}
else
{
break;
}
}
clientSock.CryptoSend(null, PacketType.OK);
return(clientSock);
}
private Cryptography.AES256 ECDH_Client()
{
Cryptography.AES256 aes;
using (ECDiffieHellmanCng dh = new ECDiffieHellmanCng())
{
dh.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
dh.HashAlgorithm = CngAlgorithm.Sha256;
byte[] publicKey = dh.PublicKey.ToByteArray();
byte[] sharekey = new byte[publicKey.Length];
socket.Receive(sharekey, publicKey.Length, SocketFlags.None);
socket.Send(publicKey, publicKey.Length, SocketFlags.None);
byte[] key = dh.DeriveKeyMaterial(CngKey.Import(sharekey, CngKeyBlobFormat.EccPublicBlob));
aes = new Cryptography.AES256(key);
}
this.aes = aes;
while (true)
{
byte[] iv = CryptoReceiveMsg();
CryptoSend(iv, PacketType.Response);
var pack = CryptoReceive();
if (pack.header == PacketType.Retry)
{
continue;
}
else if (pack.header == PacketType.Fail)
{
IPEndPoint iep = (IPEndPoint)(socket.RemoteEndPoint);
Console.WriteLine("ERROR [Host " + iep.Address + ":" + iep.Port + "] Connection test with text is failed");
this.aes = null;
return(null);
}
else if (pack.header == PacketType.OK)
{
aes.aes.IV = iv;
break;
}
}
return(aes);
}
static bool GetLatestAES(BlindSocket socket, out Cryptography.AES256 aes256)
{
aes256 = null;
byte[] key = socket.CryptoReceiveMsg();
if (key == null)
{
MessageBox.Show("파일 복호화에 실패했습니다.", "파일 열기");
return(false);
}
Console.WriteLine("Received key {0} bytes", key.Length);
byte[] iv = socket.CryptoReceiveMsg();
if (iv == null)
{
MessageBox.Show("파일 복호화에 실패했습니다.", "파일 열기");
return(false);
}
Console.WriteLine("Received iv {0} bytes", iv.Length);
aes256 = new Cryptography.AES256(key, iv);
return(true);
}
private byte[] EncryptFile(byte[] data)
{
string command = "SELECT _key, iv FROM crypto_key WHERE apply_date <= NOW() AND expire_date > NOW();";
MySqlDataAdapter adapter = new MySqlDataAdapter(command, connection);
DataSet dataset = new DataSet();
adapter.Fill(dataset);
if (dataset.Tables[0].Rows.Count != 1)
{
return(null);
}
Cryptography.AES256 aes256 = new Cryptography.AES256((byte[])(dataset.Tables[0].Rows[0]["_key"]), (byte[])(dataset.Tables[0].Rows[0]["iv"]));
try
{
uint timestemp = uint.Parse(DateTime.Now.ToString("yyyyMMdd"));
return(BlindNetUtil.MergeArray(BitConverter.GetBytes(timestemp), aes256.Encryption(data)));
}
catch (Exception ex)
{
return(null);
}
}
public BlindSocket(ref BlindSocket blindSocket)
{
socket = blindSocket.socket;
aes = blindSocket.aes;
}
public BlindSocket(Socket socket, Cryptography.AES256 aes)
{
this.socket = socket;
this.aes = aes;
}
public BlindSocket(Cryptography.AES256 aes)
{
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
this.aes = aes;
}
public BlindSocket()
{
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
aes = null;
}
