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);
}
internal CspCollectionEnumerator(CspCollection entries)
{
m_entries = entries;
m_current = -1;
}