Trying to create a .NET DLL to be used with Non-.NET Application
- by Changeling
I am trying to create a .NET DLL so I can use the cryptographic functions with my non .NET application.
I have created a class library so far with this code:
namespace AESEncryption
{
public class EncryptDecrypt
{
private static readonly byte[] optionalEntropy = { 0x21, 0x05, 0x07, 0x08, 0x27, 0x02, 0x23, 0x36, 0x45, 0x50 };
public interface IEncrypt
{
string Encrypt(string data, string filePath);
};
public class EncryptDecryptInt:IEncrypt
{
public string Encrypt(string data, string filePath)
{
byte[] plainKey;
try
{
// Read in the secret key from our cipher key store
byte[] cipher = File.ReadAllBytes(filePath);
plainKey = ProtectedData.Unprotect(cipher, optionalEntropy, DataProtectionScope.CurrentUser);
// Convert our plaintext data into a byte array
byte[] plainTextBytes = Encoding.ASCII.GetBytes(data);
MemoryStream ms = new MemoryStream();
Rijndael alg = Rijndael.Create();
alg.Mode = CipherMode.CBC;
alg.Key = plainKey;
alg.IV = optionalEntropy;
CryptoStream cs = new CryptoStream(ms, alg.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(plainTextBytes, 0, plainTextBytes.Length);
cs.Close();
byte[] encryptedData = ms.ToArray();
return Convert.ToString(encryptedData);
}
catch (Exception ex)
{
return ex.Message;
}
}
}
}
}
In my VC++ application, I am using the #import directive to import the TLB file created from the DLL, but the only available functions are _AESEncryption and LIB_AES etc
I don't see the interface or the function Encrypt.
When I try to instantiate so I can call the functions in my VC++ program, I use this code and get the following error:
HRESULT hr = CoInitialize(NULL);
IEncryptPtr pIEncrypt(__uuidof(EncryptDecryptInt));
error C2065: 'IEncryptPtr': undeclared identifier
error C2146: syntax error : missing ';' before identifier 'pIEncrypt'
