public void ExchangeTooBig()
{
AsymmetricKeyExchangeFormatter keyex = new RSAOAEPKeyExchangeFormatter(key);
byte[] M = new byte [(key.KeySize >> 3) - 10];
byte[] EM = keyex.CreateKeyExchange(M);
}
// Use the RSAOAEPKeyExchangeDeformatter class to decode the
// specified message.
private byte[] EncodeMessage(string message)
{
byte[] encodedMessage = null;
try
{
// Construct a formatter with the specified RSA key.
//<Snippet3>
RSAOAEPKeyExchangeFormatter keyEncryptor =
new RSAOAEPKeyExchangeFormatter(rsaKey);
//</Snippet3>
// Convert the message to bytes to create the encrypted data.
//<Snippet4>
byte[] byteMessage = Encoding.ASCII.GetBytes(message);
encodedMessage = keyEncryptor.CreateKeyExchange(byteMessage);
//</Snippet4>
}
catch (Exception ex)
{
Console.WriteLine("Unexpected exception caught:" + ex.ToString());
}
return(encodedMessage);
}
private void EncryptButton_Click(object sender, EventArgs e)
{
CspParameters myCspParms = new CspParameters();
myCspParms.KeyContainerName = KeyContainerEncryptTextBox.Text;
RSA myRSAProv = new RSACryptoServiceProvider(myCspParms);
RSAOAEPKeyExchangeFormatter myKeyFormatter = new RSAOAEPKeyExchangeFormatter(myRSAProv);
Aes mySymmProv = Aes.Create();
byte[] encrKey = myKeyFormatter.CreateKeyExchange(mySymmProv.Key);
byte[] data = File.ReadAllBytes(FileEncryptTextBox.Text);
using (FileStream fsout = new FileStream(FileEncryptTextBox.Text + ".encrypted", FileMode.Create))
{
using (BinaryWriter bw = new BinaryWriter(fsout))
{
bw.Write(encrKey.Length);
bw.Write(encrKey, 0, encrKey.Length);
bw.Write(mySymmProv.IV.Length);
bw.Write(mySymmProv.IV, 0, mySymmProv.IV.Length);
bw.Flush();
using (CryptoStream cs = new CryptoStream(fsout, mySymmProv.CreateEncryptor(), CryptoStreamMode.Write))
{
using (BinaryWriter sw = new BinaryWriter(cs))
{
sw.Write(data);
}
}
}
}
MessageBox.Show("Encryption completed.");
}
public byte[] Encrypt_RSA(byte[] input)
{
if (input == null || input.Length == 0)
{
ErrorHandler.OccurException(System.Net.HttpStatusCode.BadRequest);
}
return(_RSAFormatter.CreateKeyExchange(input, typeof(RijndaelManaged)));
}
/// <summary>
/// Bobの交換鍵から、
/// 「暗号化に使用する秘密鍵」と「Bobと交換するAliceの交換鍵」を生成
/// </summary>
protected override void CreateKeys()
{
RSA rsa = (RSA)this._asa;
this._aes = new AesCryptoServiceProvider(); // 秘密鍵
RSAOAEPKeyExchangeFormatter keyExchangeFormatter = new RSAOAEPKeyExchangeFormatter(rsa);
this._exchangeKey = keyExchangeFormatter.CreateKeyExchange(this._aes.Key, typeof(Aes)); // 交換鍵
}
public void SetKeys(TanksCommon.Encryption.EncryptioinKeys key)
{
var aes = new AesCryptoServiceProvider();
var iv = aes.IV;
// Encrypt the session key
RSAOAEPKeyExchangeFormatter keyFormatter = new RSAOAEPKeyExchangeFormatter(key.RsaKey);
var encryptedSessionKey = keyFormatter.CreateKeyExchange(aes.Key, typeof(Aes));
key.SetIvAndSessionKey(iv, encryptedSessionKey);
this._cryptoTransform = aes.CreateEncryptor();
}
public byte[] EncryptSessionKeyByRSA(byte[] sessionKey, string keyToUse)
{
AsymmetricAlgorithm rsa = algo;
if (!String.IsNullOrEmpty(keyToUse))
{
rsa.FromXmlString(keyToUse);
}
RSAOAEPKeyExchangeFormatter forma = new RSAOAEPKeyExchangeFormatter();
forma.SetKey(rsa);
byte[] exchangeData = forma.CreateKeyExchange(sessionKey);
return(exchangeData);
}
public void ExchangeMin()
{
AsymmetricKeyExchangeFormatter keyex = new RSAOAEPKeyExchangeFormatter(key);
byte[] M = { 0x01 };
try {
byte[] EM = keyex.CreateKeyExchange(M);
AsymmetricKeyExchangeDeformatter keyback = new RSAOAEPKeyExchangeDeformatter(key);
byte[] Mback = keyback.DecryptKeyExchange(EM);
AssertEquals("RSAOAEPKeyExchangeFormatter Min", M, Mback);
}
catch (CryptographicException ce) {
// not supported by every version of Windows - Minimum: Windows XP
Console.WriteLine(ce.Message + " (" + Environment.OSVersion.ToString() + ")");
}
}
public void Exchange128()
{
AsymmetricKeyExchangeFormatter keyex = new RSAOAEPKeyExchangeFormatter(key);
byte[] M = { 0xd4, 0x36, 0xe9, 0x95, 0x69, 0xfd, 0x32, 0xa7, 0xc8, 0xa0, 0x5b, 0xbc, 0x90, 0xd3, 0x2c, 0x49 };
try {
byte[] EM = keyex.CreateKeyExchange(M, typeof(Rijndael));
AsymmetricKeyExchangeDeformatter keyback = new RSAOAEPKeyExchangeDeformatter(key);
byte[] Mback = keyback.DecryptKeyExchange(EM);
AssertEquals("RSAOAEPKeyExchangeFormatter 128", M, Mback);
}
catch (CryptographicException ce) {
// not supported by every version of Windows - Minimum: Windows XP
Console.WriteLine(ce.Message + " (" + Environment.OSVersion.ToString() + ")");
}
}
/// <summary>
/// Encrypts the symmetric key data.
/// </summary>
/// <param name="cert">The cert.</param>
/// <param name="keyData">The key data.</param>
/// <returns>The encrypted data.</returns>
public static byte[] EncryptSymmetricKeyData(X509Certificate2 cert, byte[] keyData)
{
if (cert == null)
{
throw new ArgumentNullException("cert");
}
if (keyData == null)
{
throw new ArgumentNullException("keyData");
}
RSACryptoServiceProvider rsaPublicKey = cert.PublicKey.Key as RSACryptoServiceProvider;
RSAOAEPKeyExchangeFormatter keyFormatter = new RSAOAEPKeyExchangeFormatter(rsaPublicKey);
return(keyFormatter.CreateKeyExchange(keyData));
}
public static byte[] EncryptKey(byte[] keyData, RSA rsa, bool useOAEP)
{
if (keyData == null)
{
throw new ArgumentNullException("keyData");
}
if (rsa == null)
{
throw new ArgumentNullException("rsa");
}
if (useOAEP)
{
RSAOAEPKeyExchangeFormatter formatter = new RSAOAEPKeyExchangeFormatter(rsa);
return(formatter.CreateKeyExchange(keyData));
}
RSAPKCS1KeyExchangeFormatter formatter2 = new RSAPKCS1KeyExchangeFormatter(rsa);
return(formatter2.CreateKeyExchange(keyData));
}
/// <summary>
/// Creates FairPlay Pfx Password.
/// </summary>
/// <param name="keyId">The key id.</param>
/// <param name="contentKey">The content key data.</param>
/// <param name="name">The name.</param>
/// <param name="cert">The cert.</param>
/// <returns>The content key.</returns>
internal static ContentKeyData InitializeFairPlayPfxPassword(Guid keyId, byte[] contentKey, string name, X509Certificate2 cert)
{
RSACryptoServiceProvider rsaPublicKey = cert.PublicKey.Key as RSACryptoServiceProvider;
RSAOAEPKeyExchangeFormatter keyFormatter = new RSAOAEPKeyExchangeFormatter(rsaPublicKey);
byte[] encryptedContentKey = keyFormatter.CreateKeyExchange(contentKey);
ContentKeyData contentKeyData = new ContentKeyData
{
Id = EncryptionUtils.GetKeyIdentifierAsString(keyId),
EncryptedContentKey = Convert.ToBase64String(encryptedContentKey),
ContentKeyType = (int)ContentKeyType.FairPlayPfxPassword,
ProtectionKeyId = cert.Thumbprint,
ProtectionKeyType = (int)ProtectionKeyType.X509CertificateThumbprint,
Name = name,
};
return(contentKeyData);
}
// encrypts the supplied input key data using an RSA key and specifies whether we want to use OAEP
// padding or PKCS#1 v1.5 padding as described in the PKCS specification
public static byte[] EncryptKey(byte[] keyData, RSA rsa, bool useOAEP)
{
if (keyData is null)
{
throw new ArgumentNullException(nameof(keyData));
}
if (rsa is null)
{
throw new ArgumentNullException(nameof(rsa));
}
if (useOAEP)
{
RSAOAEPKeyExchangeFormatter rsaFormatter = new RSAOAEPKeyExchangeFormatter(rsa);
return(rsaFormatter.CreateKeyExchange(keyData));
}
else
{
RSAPKCS1KeyExchangeFormatter rsaFormatter = new RSAPKCS1KeyExchangeFormatter(rsa);
return(rsaFormatter.CreateKeyExchange(keyData));
}
}
//<Snippet2>
private static void Send(RSA key, string secretMessage, out byte[] iv, out byte[] encryptedSessionKey, out byte[] encryptedMessage)
{
using (Aes aes = new AesCryptoServiceProvider())
{
iv = aes.IV;
// Encrypt the session key
RSAOAEPKeyExchangeFormatter keyFormatter = new RSAOAEPKeyExchangeFormatter(key);
encryptedSessionKey = keyFormatter.CreateKeyExchange(aes.Key, typeof(Aes));
// Encrypt the message
using (MemoryStream ciphertext = new MemoryStream())
using (CryptoStream cs = new CryptoStream(ciphertext, aes.CreateEncryptor(), CryptoStreamMode.Write))
{
byte[] plaintextMessage = Encoding.UTF8.GetBytes(secretMessage);
cs.Write(plaintextMessage, 0, plaintextMessage.Length);
cs.Close();
encryptedMessage = ciphertext.ToArray();
}
}
}
private void EncryptButton_Click(object sender, EventArgs e)
{
RSACng myRSAProv;
if (CngKey.Exists(KeyContainerEncryptTextBox.Text))
{
myRSAProv = new RSACng(CngKey.Open(KeyContainerEncryptTextBox.Text));
}
else
{
myRSAProv = new RSACng(CngKey.Create(CngAlgorithm.Rsa, KeyContainerEncryptTextBox.Text));
}
RSAOAEPKeyExchangeFormatter myKeyFormatter = new RSAOAEPKeyExchangeFormatter(myRSAProv);
AesCng mySymmProv = new AesCng();
byte[] encrKey = myKeyFormatter.CreateKeyExchange(mySymmProv.Key);
byte[] data = File.ReadAllBytes(FileEncryptTextBox.Text);
using (FileStream fsout = new FileStream(FileEncryptTextBox.Text + ".encrypted", FileMode.Create))
{
using (BinaryWriter bw = new BinaryWriter(fsout))
{
bw.Write(encrKey.Length);
bw.Write(encrKey, 0, encrKey.Length);
bw.Write(mySymmProv.IV.Length);
bw.Write(mySymmProv.IV, 0, mySymmProv.IV.Length);
bw.Flush();
using (CryptoStream cs = new CryptoStream(fsout, mySymmProv.CreateEncryptor(), CryptoStreamMode.Write))
{
using (BinaryWriter sw = new BinaryWriter(cs))
{
sw.Write(data);
}
}
}
}
MessageBox.Show("Encryption completed.");
}
public void ExchangeNoKey()
{
AsymmetricKeyExchangeFormatter keyex = new RSAOAEPKeyExchangeFormatter();
byte[] M = keyex.CreateKeyExchange(new byte [16]);
}
static void Main(string[] args)
{
if (args.Length < 3)
{
Console.WriteLine("Usage: -e/-d Filename KeyContainer");
return;
}
if (args[0] == "-e")
{
CspParameters myCspParms = new CspParameters {
KeyContainerName = args[2]
};
RSACryptoServiceProvider myRSAProv = new RSACryptoServiceProvider(myCspParms);
RSAOAEPKeyExchangeFormatter myKeyFormatter = new RSAOAEPKeyExchangeFormatter(myRSAProv);
Aes mySymmProv = Aes.Create();
byte[] encrKey = myKeyFormatter.CreateKeyExchange(mySymmProv.Key);
byte[] data = File.ReadAllBytes(args[1]);
using (FileStream fsout = new FileStream(args[1] + ".encrypted", FileMode.Create))
{
using (BinaryWriter bw = new BinaryWriter(fsout))
{
bw.Write(encrKey.Length);
bw.Write(encrKey, 0, encrKey.Length);
bw.Write(mySymmProv.IV.Length);
bw.Write(mySymmProv.IV, 0, mySymmProv.IV.Length);
bw.Flush();
using (CryptoStream cs = new CryptoStream(fsout, mySymmProv.CreateEncryptor(), CryptoStreamMode.Write))
{
using (BinaryWriter sw = new BinaryWriter(cs))
{
sw.Write(data);
sw.Flush();
}
}
}
}
}
else if (args[0] == "-d")
{
CspParameters myCspParms = new CspParameters {
KeyContainerName = args[2]
};
RSACryptoServiceProvider myRSAProv = new RSACryptoServiceProvider(myCspParms);
RSAOAEPKeyExchangeDeformatter myKeyDeformatter = new RSAOAEPKeyExchangeDeformatter(myRSAProv);
Aes mySymmProv = Aes.Create();
using (FileStream fs = new FileStream(args[1], FileMode.Open))
{
using (BinaryReader br = new BinaryReader(fs))
{
int keyLength = br.ReadInt32();
byte[] encrKey = new byte[keyLength];
br.Read(encrKey, 0, keyLength);
int ivLength = br.ReadInt32();
byte[] IV = new byte[ivLength];
br.Read(IV, 0, ivLength);
byte[] Key = myKeyDeformatter.DecryptKeyExchange(encrKey);
mySymmProv.Key = Key;
mySymmProv.IV = IV;
using (CryptoStream cs = new CryptoStream(fs, mySymmProv.CreateDecryptor(), CryptoStreamMode.Read))
{
int dataLen = (int)fs.Length - 4 - keyLength - 4 - ivLength;
byte[] data = new byte[dataLen];
int len = cs.Read(data, 0, dataLen);
using (FileStream outStream = File.Open(args[1].Replace("encrypted", "decrypted"), FileMode.OpenOrCreate))
{
outStream.Write(data, 0, len);
outStream.Flush();
}
}
}
}
}
else
{
Console.WriteLine("Usage: -e/-d Filename KeyContainer");
return;
}
}
public byte[] Encrypt_RSA(byte[] input)
{
return(_RSAFormatter.CreateKeyExchange(input, typeof(RijndaelManaged)));
}
// FIXME [KeyContainerPermission (SecurityAction.Assert, KeyContainerName = "DAPI",
// Flags = KeyContainerPermissionFlags.Open | KeyContainerPermissionFlags.Create)]
public static byte[] Protect(byte[] userData, byte[] optionalEntropy, DataProtectionScope scope)
{
if (userData == null)
{
throw new ArgumentNullException("userData");
}
Rijndael aes = Rijndael.Create();
aes.KeySize = 128;
byte[] encdata = null;
using (MemoryStream ms = new MemoryStream())
{
ICryptoTransform t = aes.CreateEncryptor();
using (CryptoStream cs = new CryptoStream(ms, t, CryptoStreamMode.Write))
{
cs.Write(userData, 0, userData.Length);
cs.Close();
encdata = ms.ToArray();
}
}
byte[] key = null;
byte[] iv = null;
byte[] secret = null;
byte[] header = null;
SHA256 hash = SHA256.Create();
try
{
key = aes.Key;
iv = aes.IV;
secret = new byte[1 + 1 + 16 + 1 + 16 + 1 + 32];
byte[] digest = hash.ComputeHash(userData);
if ((optionalEntropy != null) && (optionalEntropy.Length > 0))
{
// the same optionalEntropy will be required to get the data back
byte[] mask = hash.ComputeHash(optionalEntropy);
for (int i = 0; i < 16; i++)
{
key[i] ^= mask[i];
iv[i] ^= mask[i + 16];
}
secret[0] = 2; // entropy
}
else
{
secret[0] = 1; // without entropy
}
secret[1] = 16; // key size
Buffer.BlockCopy(key, 0, secret, 2, 16);
secret[18] = 16; // iv size
Buffer.BlockCopy(iv, 0, secret, 19, 16);
secret[35] = 32; // digest size
Buffer.BlockCopy(digest, 0, secret, 36, 32);
RSAOAEPKeyExchangeFormatter formatter = new RSAOAEPKeyExchangeFormatter(GetKey(scope));
header = formatter.CreateKeyExchange(secret);
}
finally
{
if (key != null)
{
Array.Clear(key, 0, key.Length);
key = null;
}
if (secret != null)
{
Array.Clear(secret, 0, secret.Length);
secret = null;
}
if (iv != null)
{
Array.Clear(iv, 0, iv.Length);
iv = null;
}
aes.Clear();
hash.Clear();
}
byte[] result = new byte[header.Length + encdata.Length];
Buffer.BlockCopy(header, 0, result, 0, header.Length);
Buffer.BlockCopy(encdata, 0, result, header.Length, encdata.Length);
return(result);
}
public void Start()
{
RijndaelManaged CryRijnd;
ICryptoTransform Decryptor, Encryptor;
byte[] CryKey;
byte[] CryIV;
CryRijnd = new RijndaelManaged();
Console.WriteLine("Клиент соединен");
ConLog.WriteLine("Клиент соединен");
//получаем открытый ключ от клиента.
//создаём сеансовый открытый и закрытый ключ
//шифруем их при помощи открытого ключа от клиента
//отсылаем клиенту
//для дальнейшей передачи данных используем сеановый ключ
try
{
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
byte[] publicKey = ReadMessageNoCry(); //получили публичный ключ
rsa.ImportCspBlob(publicKey);
CryRijnd.GenerateKey(); //создали сессионный ключ
//этот класс специально предназначен для зашифрованного обмена ключами,
// потому им и воспользуемся
RSAOAEPKeyExchangeFormatter keyFormatter = new RSAOAEPKeyExchangeFormatter(rsa);
byte[] crySessionKey = keyFormatter.CreateKeyExchange(CryRijnd.Key); //зашифровали ключ
byte[] mess = new byte[4 + crySessionKey.Length];
ToAByte(crySessionKey.Length).CopyTo(mess, 0);
crySessionKey.CopyTo(mess, 4);
Client.GetStream().Write(mess, 0, mess.Length); //отправили клиенту сессионый ключ
CryRijnd.GenerateIV();
byte[] IV = CryRijnd.IV;
mess = new byte[4 + IV.Length];
ToAByte(IV.Length).CopyTo(mess, 0);
IV.CopyTo(mess, 4);
Client.GetStream().Write(mess, 0, mess.Length); //отправили клиенту вектор инициализации
CryKey = CryRijnd.Key;
CryIV = CryRijnd.IV;
Encryptor = CryRijnd.CreateEncryptor(CryRijnd.Key, CryRijnd.IV);
Decryptor = CryRijnd.CreateDecryptor(CryRijnd.Key, CryRijnd.IV);
CryWr = new CryptoStream(Client.GetStream(), Encryptor, CryptoStreamMode.Write);
CryRd = new CryptoStream(Client.GetStream(), Decryptor, CryptoStreamMode.Read);
}
}
catch (Exception e)
{
Console.WriteLine("Error: {0}", e.Message);
ConLog.WriteLine("Error: {0}", e.Message);
}
while (Client.Connected)
{
byte[] received = ReadMessage(CryRd); //ждём сообщения
if (received == null) //если вернулся null, то клиент разорвал соединение
{
Console.WriteLine("{0}: Неожиданное завершение работы с клиентом", Login);
ConLog.WriteLine("{0}: Неожиданное завершение работы с клиентом", Login);
UsrRec.RemoveUser(Login);
Client.Close();
break;
}
int tmpSize = 10 * 2; //берём первые 10 символов и из них получаем комманду
if (tmpSize > received.Length)
{
tmpSize = received.Length; //если сообщение короче, чем 10 символов, то берём всё сообщение
}
string tmpStr = Encoding.Unicode.GetString(received, 0, tmpSize);
string command = tmpStr.Split(' ')[0]; //либо команда - это всё сообщение, либо оно
//отделяется пробелом от данных
//Console.WriteLine("Received: {0}", command);
//ConLog.WriteLine("Received: {0}", command);
if (command == "LOGIN")
{
Login = GetPasString(received, 6 * 2);
if (UsrRec.NewUser(Login, CryWr))
{
Console.WriteLine("Login: {0}", Login);
ConLog.WriteLine("Login: {0}", Login);
SendResponse(CryWr, "LOG_OK");
}
else
{
Console.WriteLine("Ошибка входа с логином {0}. Пользователь уже вошёл", Login);
ConLog.WriteLine("Ошибка входа с логином {0}. Пользователь уже вошёл", Login);
SendResponse(CryWr, "LOG_ERR");
Client.Close();
break;
}
}
else if (command == "LOGOUT")
{
Console.WriteLine("Logout: {0}", Login);
ConLog.WriteLine("Logout: {0}", Login);
UsrRec.RemoveUser(Login);
Client.Close();
}
else if (command == "FILE")
{
AddFile(received);
received = null;
}
else if (command == "GETOTHERF")
{
GetOtherFiles(received);
}
else if (command == "GETUSERF")
{
GetUserFiles(received);
}
else if (command == "GET")
{
SendFile(received);
}
else if (command == "DELETE")
{
DeleteFile(received);
}
else if (command == "PSWD")
{
byte[] Key = new byte[0x20];
for (int i = 0; i < 0x20; i++)
{
Key[i] = received[5 * 2 + i];
}
UsrRec.SetLastAccessKey(Login, Key);
}
else if (command == "ERROR")
{
UsrRec.SetLastAccessDenied(Login);
}
received = null;
GC.Collect();
}
}
/// <inheritdoc />
protected internal override byte[] Encrypt(byte[] data, byte[] iv)
{
var keyExchange = new RSAOAEPKeyExchangeFormatter(this.Rsa);
return(keyExchange.CreateKeyExchange(data));
}