This is a poorly documented library. For instance, the declaration of CRYPT_CONTEXT_FUNCTION_PROVIDERS
is in fact:
typedef struct _CRYPT_CONTEXT_FUNCTION_PROVIDERS
{
ULONG cProviders;
PWSTR *rgpszProviders;
}
CRYPT_CONTEXT_FUNCTION_PROVIDERS, *PCRYPT_CONTEXT_FUNCTION_PROVIDERS;
This is lifted directly from bcrypt.h
.
Anyway, here's a translation of the C++ code for you:
using System;
using System.Text;
using System.Runtime.InteropServices;
namespace ConsoleApplication1
{
class Program
{
[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);
[DllImport("Bcrypt.dll", CharSet = CharSet.Unicode)]
static extern uint BCryptAddContextFunction(uint dwTable, string pszContext, uint dwInterface, string pszFunction, uint dwPosition);
[DllImport("Bcrypt.dll", CharSet = CharSet.Unicode)]
static extern uint BCryptRemoveContextFunction(uint dwTable, string pszContext, uint dwInterface, string pszFunction);
[StructLayout(LayoutKind.Sequential)]
public 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 void DoStuff()
{
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));
Console.WriteLine(functions.cFunctions);
IntPtr pStr = functions.rgpszFunctions;
for (int i = 0; i < functions.cFunctions; i++)
{
Console.WriteLine(Marshal.PtrToStringUni(Marshal.ReadIntPtr(pStr)));
pStr += IntPtr.Size;
}
BCryptFreeBuffer(ppBuffer);
}
}
static void Main(string[] args)
{
DoStuff();
Console.ReadLine();
}
}
}
On my machine the output is:
30 TLS_RSA_WITH_AES_128_CBC_SHA256 TLS_RSA_WITH_AES_128_CBC_SHA TLS_RSA_WITH_AES_256_CBC_SHA256 TLS_RSA_WITH_AES_256_CBC_SHA TLS_RSA_WITH_RC4_128_SHA TLS_RSA_WITH_3DES_EDE_CBC_SHA TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P384 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P384 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P384 TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P256 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P256 TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P384 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P384 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P256 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P384 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P256 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P384 TLS_DHE_DSS_WITH_AES_128_CBC_SHA256 TLS_DHE_DSS_WITH_AES_128_CBC_SHA TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 TLS_DHE_DSS_WITH_AES_256_CBC_SHA TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA TLS_RSA_WITH_RC4_128_MD5 SSL_CK_RC4_128_WITH_MD5 SSL_CK_DES_192_EDE3_CBC_WITH_MD5 TLS_RSA_WITH_NULL_SHA256 TLS_RSA_WITH_NULL_SHA
I urge you to get to grips with some simple C++ to make progress. Take the example from MSDN and compile it. Run it under the debugger and get to know it. Use Visual Studio to locate definitions and declarations. For instance, Visual Studio took me straight to the definition of NCRYPT_SCHANNEL_INTERFACE
.