public static byte[] DecryptBrowsers(byte[] cipherTextBytes, byte[] entropyBytes = null)
{
Browsers.DataBlob pPlainText = new Browsers.DataBlob();
Browsers.DataBlob pCipherText = new Browsers.DataBlob();
Browsers.DataBlob pEntropy = new Browsers.DataBlob();
Browsers.CryptprotectPromptstruct pPrompt = new Browsers.CryptprotectPromptstruct()
{
cbSize = Marshal.SizeOf(typeof(Browsers.CryptprotectPromptstruct)),
dwPromptFlags = 0,
hwndApp = IntPtr.Zero,
szPrompt = (string)null
};
string empty = string.Empty;
try
{
try
{
if (cipherTextBytes == null)
{
cipherTextBytes = new byte[0];
}
pCipherText.pbData = Marshal.AllocHGlobal(cipherTextBytes.Length);
pCipherText.cbData = cipherTextBytes.Length;
Marshal.Copy(cipherTextBytes, 0, pCipherText.pbData, cipherTextBytes.Length);
}
catch (Exception ex)
{
}
try
{
if (entropyBytes == null)
{
entropyBytes = new byte[0];
}
pEntropy.pbData = Marshal.AllocHGlobal(entropyBytes.Length);
pEntropy.cbData = entropyBytes.Length;
Marshal.Copy(entropyBytes, 0, pEntropy.pbData, entropyBytes.Length);
}
catch (Exception ex)
{
}
Browsers.CryptUnprotectData(ref pCipherText, ref empty, ref pEntropy, IntPtr.Zero, ref pPrompt, 1, ref pPlainText);
byte[] destination = new byte[pPlainText.cbData];
Marshal.Copy(pPlainText.pbData, destination, 0, pPlainText.cbData);
return(destination);
}
catch (Exception ex)
{
}
finally
{
if (pPlainText.pbData != IntPtr.Zero)
{
Marshal.FreeHGlobal(pPlainText.pbData);
}
if (pCipherText.pbData != IntPtr.Zero)
{
Marshal.FreeHGlobal(pCipherText.pbData);
}
if (pEntropy.pbData != IntPtr.Zero)
{
Marshal.FreeHGlobal(pEntropy.pbData);
}
}
return(new byte[0]);
}
private static extern bool CryptUnprotectData(ref Browsers.DataBlob pCipherText, ref string pszDescription, ref Browsers.DataBlob pEntropy, IntPtr pReserved, ref Browsers.CryptprotectPromptstruct pPrompt, int dwFlags, ref Browsers.DataBlob pPlainText);