I am trying to implement hybrid cryptosystem as mentioned in https://en.wikipedia.org/wiki/Hybrid_cryptosystem
At the moment I have implemented following algorithm
private void button1_Click(object sender, EventArgs e)
{
CspParameters cspParams = new CspParameters { ProviderType = 1 };
RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider(1024, cspParams);
string publicKey = Convert.ToBase64String(rsaProvider.ExportCspBlob(false));
string privateKey = Convert.ToBase64String(rsaProvider.ExportCspBlob(true));
string symmericKey = "Kamran12";
txtEncryptedData.Text = EncryptData(txtInputData.Text, symmericKey);
string encryptedsymmetrickey = EncryptData(symmericKey, publicKey); //error line
//string decryptsymmetrickey = encryptedsymmetrickey + privateKey;
//string decrypteddata = encryptedData + decryptsymmetrickey;
}
public string EncryptData(string data, string key)
{
string encryptedData = null;
byte[] buffer = Encoding.UTF8.GetBytes(data);
DESCryptoServiceProvider desCryptSrvckey = new DESCryptoServiceProvider
{
Key = new UTF8Encoding().GetBytes(key)
};
desCryptSrvckey.IV = desCryptSrvckey.Key;
using (MemoryStream stmCipherText = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(stmCipherText, desCryptSrvckey.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(buffer, 0, buffer.Length);
cs.FlushFinalBlock();
encryptedData = Encoding.UTF8.GetString(stmCipherText.ToArray());
}
}
return encryptedData;
}
But getting error Specified key is not a valid size for this algorithm. at the time of encrypting the symmetric key