Exemplo n.º 1
0
        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]);
        }
Exemplo n.º 2
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);