CipherHelper

    class CipherHelper
    {
        [DllImport("Bcrypt.dll", CharSet = CharSet.Unicode)]
        static extern uint BCryptEnumContextFunctions(uint dwTable, string pszContext, uint dwInterface, ref uint pcbBuffer, ref IntPtr ppBuffer);

        [DllImport("Bcrypt.dll")]
        static extern void BCryptFreeBuffer(IntPtr pvBuffer);

        [StructLayout(LayoutKind.Sequential)]
        struct CRYPT_CONTEXT_FUNCTIONS
        {
            public uint cFunctions;
            public IntPtr rgpszFunctions;
        }

        const uint CRYPT_LOCAL = 0x00000001;
        const uint NCRYPT_SCHANNEL_INTERFACE = 0x00010002;
        const uint CRYPT_PRIORITY_TOP = 0x00000000;
        const uint CRYPT_PRIORITY_BOTTOM = 0xFFFFFFFF;

        public static IEnumerable<string> GetCipherAlgorithms()
        {
            uint cbBuffer = 0;
            IntPtr ppBuffer = IntPtr.Zero;
            uint Status = BCryptEnumContextFunctions(
                    CRYPT_LOCAL,
                    "SSL",
                    NCRYPT_SCHANNEL_INTERFACE,
                    ref cbBuffer,
                    ref ppBuffer);
            if (Status == 0)
            {
                CRYPT_CONTEXT_FUNCTIONS functions = (CRYPT_CONTEXT_FUNCTIONS)Marshal.PtrToStructure(ppBuffer, typeof(CRYPT_CONTEXT_FUNCTIONS));
                try
                {
                    IntPtr pStr = functions.rgpszFunctions;
                    for (int i = 0; i < functions.cFunctions; i++)
                    {
                        yield return Marshal.PtrToStringUni(Marshal.ReadIntPtr(pStr));
                        pStr += IntPtr.Size;
                    }
                }
                finally
                {
                    BCryptFreeBuffer(ppBuffer);
                }
            }
        }
    }