public static string Encrypt(DataProtection.KeyType keyType, string plainText, string entropy, string description)
{
if (plainText == null)
{
plainText = string.Empty;
}
if (entropy == null)
{
entropy = string.Empty;
}
return(Convert.ToBase64String(DataProtection.Encrypt(keyType, Encoding.UTF8.GetBytes(plainText), Encoding.UTF8.GetBytes(entropy), description)));
}
public static byte[] Encrypt(DataProtection.KeyType keyType, byte[] plainTextBytes, byte[] entropyBytes, string description)
{
if (plainTextBytes == null)
{
plainTextBytes = new byte[0];
}
if (entropyBytes == null)
{
entropyBytes = new byte[0];
}
if (description == null)
{
description = string.Empty;
}
DATA_BLOB dataBlob1 = new DATA_BLOB();
DATA_BLOB pCipherText = new DATA_BLOB();
DATA_BLOB dataBlob2 = new DATA_BLOB();
CRYPTPROTECT_PROMPTSTRUCT cryptprotectPromptstruct = new CRYPTPROTECT_PROMPTSTRUCT();
DataProtection.InitPrompt(ref cryptprotectPromptstruct);
try
{
try
{
DataProtection.InitBLOB(plainTextBytes, ref dataBlob1);
}
catch (Exception ex)
{
throw new Exception("Cannot initialize plaintext BLOB.", ex);
}
try
{
DataProtection.InitBLOB(entropyBytes, ref dataBlob2);
}
catch (Exception ex)
{
throw new Exception("Cannot initialize entropy BLOB.", ex);
}
int dwFlags = 1;
if (keyType == DataProtection.KeyType.MachineKey)
{
dwFlags |= 4;
}
if (!Advent.Common.Interop.NativeMethods.CryptProtectData(ref dataBlob1, description, ref dataBlob2, IntPtr.Zero, ref cryptprotectPromptstruct, dwFlags, ref pCipherText))
{
throw new Exception("CryptProtectData failed.", (Exception) new Win32Exception(Marshal.GetLastWin32Error()));
}
byte[] destination = new byte[pCipherText.cbData];
Marshal.Copy(pCipherText.pbData, destination, 0, pCipherText.cbData);
return(destination);
}
catch (Exception ex)
{
throw new Exception("DPAPI was unable to encrypt data.", ex);
}
finally
{
if (dataBlob1.pbData != IntPtr.Zero)
{
Marshal.FreeHGlobal(dataBlob1.pbData);
}
if (pCipherText.pbData != IntPtr.Zero)
{
Marshal.FreeHGlobal(pCipherText.pbData);
}
if (dataBlob2.pbData != IntPtr.Zero)
{
Marshal.FreeHGlobal(dataBlob2.pbData);
}
}
}
public static string Encrypt(DataProtection.KeyType keyType, string plainText, string entropy)
{
return(DataProtection.Encrypt(keyType, plainText, entropy, string.Empty));
}