static CspCNGCollection m_enumcngprovs()
{
UInt32 pImplCount = 0;
IntPtr ppImplList = IntPtr.Zero;
IntPtr phProvider = IntPtr.Zero;
StringBuilder SB = new StringBuilder();
Hashtable interfaces = get_interfaces();
CspCNGCollection csps = new CspCNGCollection();
UInt32 retn = nCrypt.NCryptEnumStorageProviders(ref pImplCount, ref ppImplList, 0);
if (retn != 0)
{
throw new Win32Exception(unchecked ((Int32)retn));
}
IntPtr pvInput = ppImplList;
for (Int32 index = 0; index < pImplCount; index++)
{
nCrypt2.NCryptProviderName Name =
(nCrypt2.NCryptProviderName)Marshal.PtrToStructure(ppImplList, typeof(nCrypt2.NCryptProviderName));
ppImplList = (IntPtr)((UInt64)ppImplList + (UInt32)Marshal.SizeOf(typeof(nCrypt2.NCryptProviderName)));
SB.Append(Name.pszName + ",");
}
String[] names = SB.ToString().Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
nCrypt.NCryptFreeBuffer(pvInput);
foreach (String pszProviderName in names)
{
ALG_ID_CNGCollection algs = new ALG_ID_CNGCollection();
retn = nCrypt.NCryptOpenStorageProvider(ref phProvider, pszProviderName, 0);
if (retn == 0)
{
Int32 pdwAlgCount = 0;
IntPtr ppAlgList = IntPtr.Zero;
retn = nCrypt.NCryptEnumAlgorithms(phProvider, 0, ref pdwAlgCount, ref ppAlgList, 0);
if (retn != 0)
{
throw new Win32Exception(unchecked ((Int32)retn));
}
pvInput = ppAlgList;
for (Int32 index = 0; index < pdwAlgCount; index++)
{
nCrypt2.NCryptAlgorithmName AlgId =
(nCrypt2.NCryptAlgorithmName)Marshal.PtrToStructure(ppAlgList, typeof(nCrypt2.NCryptAlgorithmName));
algs.Add(get_cngalgparams(AlgId, interfaces));
ppAlgList = (IntPtr)((UInt64)ppAlgList + (UInt32)Marshal.SizeOf(typeof(nCrypt2.NCryptAlgorithmName)));
}
nCrypt.NCryptFreeBuffer(pvInput);
}
csps.Add(new CspCNG(pszProviderName, String.Empty, algs));
}
return(csps);
}
static ALG_ID_CNG get_cngalgparams(nCrypt2.NCryptAlgorithmName algId, IDictionary interfaces)
{
Int32[] options = { 4, 8, 16 };
Int32[] validoptions = new Int32[0];
String[] operations = new String[0];
Int32 index = 0;
foreach (Int32 dwAlgOperations in options.Where(dwAlgOperations => (algId.dwAlgOperations & dwAlgOperations) != 0))
{
Array.Resize(ref validoptions, index + 1);
validoptions.SetValue(dwAlgOperations, index);
index++;
}
index = 0;
foreach (Int32 opt in validoptions)
{
switch (opt)
{
case 4:
Array.Resize(ref operations, index + 1);
operations.SetValue("Asymmetric encryption", index);
break;
case 8:
Array.Resize(ref operations, index + 1);
operations.SetValue("Secret agreement", index);
break;
case 16:
Array.Resize(ref operations, index + 1);
operations.SetValue("Signature", index);
break;
}
}
return(new ALG_ID_CNG(algId.pszName, (String)interfaces[algId.dwClass], operations));
}
