private string Decrypt(string cypherText)
{
var inStr = new StringBuilder(cypherText);
var num = NSSBase64_DecodeBuffer(IntPtr.Zero, IntPtr.Zero, inStr, inStr.Length);
var result = new TSECItem();
var structure = (TSECItem)Marshal.PtrToStructure(new IntPtr(num), typeof(TSECItem));
if ((uint)PK11SDR_Decrypt(ref structure, ref result, 0) > 0U || result.SECItemLen == 0)
{
return(null);
}
var numArray = new byte[result.SECItemLen];
Marshal.Copy(new IntPtr(result.SECItemData), numArray, 0, result.SECItemLen);
return(Encoding.UTF8.GetString(numArray));
}
private int PK11SDR_Decrypt(ref TSECItem data, ref TSECItem result, int cx)
{
return(((PK11SDR_DecryptPtr)Marshal.GetDelegateForFunctionPointer(
GetProcAddress(_nssModule, nameof(PK11SDR_Decrypt)), typeof(PK11SDR_DecryptPtr)))(ref data, ref result,
cx));
}