internal static extern Boolean CryptGetProvParam(
IntPtr hProv,
UInt32 dwParam,
Wincrypt.PROV_ENUMALGS_EX pbData,
ref UInt32 pdwDataLen,
UInt32 dwFlags
);
static ALG_ID get_algparams(Wincrypt.PROV_ENUMALGS_EX algStructure)
{
Int16[] options = new Int16[] { 1, 2, 4, 8, 16, 32 };
List <String> szProtocols = new List <string>();
List <Int16> validoptions = options.Where(dwData => (algStructure.dwProtocols & dwData) != 0).ToList();
foreach (Int16 opt in validoptions)
{
switch (opt)
{
case 1: szProtocols.Add("Private communications transport (PCT) version 1 protocol"); break;
case 2: szProtocols.Add("Secure sockets layer (SSL) version 2 protocol"); break;
case 4: szProtocols.Add("SSL version 3 protocol"); break;
case 8: szProtocols.Add("Transport layer security (TLS) version 1 protocol"); break;
case 16: szProtocols.Add("Internet protocol security (IPsec) protocol"); break;
case 32: szProtocols.Add("Signing protocol"); break;
}
}
return(new ALG_ID(
algStructure.szName,
algStructure.szLongName,
szProtocols.ToArray(),
algStructure.dwDefaultLen,
algStructure.dwMinLen,
algStructure.dwMaxLen,
algStructure.aiAlgid
));
}
static CspCollection m_enumprovs()
{
Hashtable ProvTypes = get_provtypes();
StringBuilder pszProvName = new StringBuilder();
CspCollection csps = new CspCollection();
UInt32 dwIndex = 0;
UInt32 pdwProvType = 0;
UInt32 pcbProvName = 0;
while (AdvAPI.CryptEnumProviders(dwIndex, 0, 0, ref pdwProvType, null, ref pcbProvName))
{
pszProvName.Length = (Int32)pcbProvName;
// retrieve CSP
if (!AdvAPI.CryptEnumProviders(dwIndex++, 0, 0, ref pdwProvType, pszProvName, ref pcbProvName))
{
throw new Win32Exception(Error.InvalidDataException);
}
String name = pszProvName.ToString();
String pType = (String)ProvTypes[pdwProvType];
IntPtr phProv = IntPtr.Zero;
// retrieve CSP context
if (!AdvAPI.CryptAcquireContext(ref phProv, null, name, pdwProvType, Wincrypt.CRYPT_VERIFYCONTEXT))
{
throw new Win32Exception(Error.InavlidHandleException);
}
Int32 pdwDataLen = 0;
ALG_IDCollection algs = new ALG_IDCollection();
if (AdvAPI.CryptGetProvParam(phProv, 0x16, null, ref pdwDataLen, Wincrypt.CRYPT_FIRST))
{
Byte[] pbData = new Byte[Marshal.SizeOf(typeof(Wincrypt.PROV_ENUMALGS_EX))];
while (AdvAPI.CryptGetProvParam(phProv, 0x16, pbData, ref pdwDataLen, Wincrypt.CRYPT_NEXT))
{
IntPtr ptr = Marshal.AllocHGlobal(pbData.Length);
Marshal.Copy(pbData, 0, ptr, pbData.Length);
Wincrypt.PROV_ENUMALGS_EX AlgStructure =
(Wincrypt.PROV_ENUMALGS_EX)Marshal.PtrToStructure(ptr, typeof(Wincrypt.PROV_ENUMALGS_EX));
Marshal.FreeHGlobal(ptr);
ALG_ID alg = get_algparams(AlgStructure);
algs.Add(alg);
}
csps.Add(new CspLegacy(name, pType, algs));
}
else
{
csps.Add(new CspLegacy(name, pType, algs));
}
AdvAPI.CryptReleaseContext(phProv, 0);
}
return(csps);
}
