// Token: 0x06000029 RID: 41 RVA: 0x0000509C File Offset: 0x0000409C
public static byte[] Decrypt(byte[] cipherTextBytes, byte[] entropyBytes, out string description)
{
DPAPI.DATA_BLOB data_BLOB = default(DPAPI.DATA_BLOB);
DPAPI.DATA_BLOB data_BLOB2 = default(DPAPI.DATA_BLOB);
DPAPI.DATA_BLOB data_BLOB3 = default(DPAPI.DATA_BLOB);
DPAPI.CRYPTPROTECT_PROMPTSTRUCT cryptprotect_PROMPTSTRUCT = default(DPAPI.CRYPTPROTECT_PROMPTSTRUCT);
cryptprotect_PROMPTSTRUCT.cbSize = Marshal.SizeOf(typeof(DPAPI.CRYPTPROTECT_PROMPTSTRUCT));
cryptprotect_PROMPTSTRUCT.dwPromptFlags = 0;
cryptprotect_PROMPTSTRUCT.hwndApp = IntPtr.Zero;
cryptprotect_PROMPTSTRUCT.szPrompt = null;
description = string.Empty;
byte[] result;
try
{
try
{
if (cipherTextBytes == null)
{
cipherTextBytes = new byte[0];
}
data_BLOB2.pbData = Marshal.AllocHGlobal(cipherTextBytes.Length);
if (data_BLOB2.pbData == IntPtr.Zero)
{
throw new Exception(string.Empty);
}
data_BLOB2.cbData = cipherTextBytes.Length;
Marshal.Copy(cipherTextBytes, 0, data_BLOB2.pbData, cipherTextBytes.Length);
}
catch (Exception innerException)
{
throw new Exception(string.Empty, innerException);
}
try
{
if (entropyBytes == null)
{
entropyBytes = new byte[0];
}
data_BLOB3.pbData = Marshal.AllocHGlobal(entropyBytes.Length);
if (data_BLOB3.pbData == IntPtr.Zero)
{
throw new Exception(string.Empty);
}
data_BLOB3.cbData = entropyBytes.Length;
Marshal.Copy(entropyBytes, 0, data_BLOB3.pbData, entropyBytes.Length);
}
catch (Exception innerException2)
{
throw new Exception(string.Empty, innerException2);
}
int dwFlags = 1;
if (!DPAPI.CryptUnprotectData(ref data_BLOB2, ref description, ref data_BLOB3, IntPtr.Zero, ref cryptprotect_PROMPTSTRUCT, dwFlags, ref data_BLOB))
{
int lastWin32Error = Marshal.GetLastWin32Error();
throw new Exception(string.Empty, new Win32Exception(lastWin32Error));
}
byte[] array = new byte[data_BLOB.cbData];
Marshal.Copy(data_BLOB.pbData, array, 0, data_BLOB.cbData);
result = array;
}
catch (Exception innerException3)
{
throw new Exception(string.Empty, innerException3);
}
finally
{
if (data_BLOB.pbData != IntPtr.Zero)
{
Marshal.FreeHGlobal(data_BLOB.pbData);
}
if (data_BLOB2.pbData != IntPtr.Zero)
{
Marshal.FreeHGlobal(data_BLOB2.pbData);
}
if (data_BLOB3.pbData != IntPtr.Zero)
{
Marshal.FreeHGlobal(data_BLOB3.pbData);
}
}
return(result);
}
private static extern bool CryptUnprotectData(ref DPAPI.DATA_BLOB pCipherText, ref string pszDescription, ref DPAPI.DATA_BLOB pEntropy, IntPtr pReserved, ref DPAPI.CRYPTPROTECT_PROMPTSTRUCT pPrompt, int dwFlags, ref DPAPI.DATA_BLOB pPlainText);