protected override void DoDispose()
{
if (cspHandler == IntPtr.Zero)
{
return;
}
CryptoApi.CryptReleaseContext(cspHandler, 0);
cspHandler = IntPtr.Zero;
}
public void Initialize()
{
var reOid = new Regex("^[0-9]+([.][0-9]+)+$", RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
IntPtr cspHandler = IntPtr.Zero;
IntPtr pnt = IntPtr.Zero;
try
{
if (!CryptoApi.CryptAcquireContext(ref cspHandler, null, ProviderName, ProviderType, Constants.CryptVerifycontext))
{
throw new Win32Exception();
}
int dwDataLen = Marshal.SizeOf(typeof(CryptoApiEx.PROV_ENUMALGS_EX)) * 2;
pnt = Marshal.AllocHGlobal(dwDataLen);
uint dwFlags = 1;
while (CryptoApiEx.CryptGetProvParam(cspHandler, Constants.PP_ENUMALGS_EX, pnt, ref dwDataLen, dwFlags))
{
var data = (CryptoApiEx.PROV_ENUMALGS_EX)Marshal.PtrToStructure(pnt, typeof(CryptoApiEx.PROV_ENUMALGS_EX));
IntPtr oidPtr = CryptoApiEx.CertAlgIdToOID(data.aiAlgid);
var oid = Marshal.PtrToStringAnsi(oidPtr);
if (string.IsNullOrEmpty(oid) || !reOid.IsMatch(oid))
{
oid = string.Empty;
}
this.Add(new ProviderAlgo()
{
AlgId = data.aiAlgid,
Oid = oid,
Name = data.szName,
LongName = data.szLongName,
MinLen = data.dwMinLen,
MaxLen = data.dwMaxLen,
DefaultLen = data.dwDefaultLen,
Protocols = data.dwProtocols
});
dwFlags = 2;
}
}
finally
{
if (pnt != IntPtr.Zero)
{
Marshal.FreeHGlobal(pnt);
}
if (cspHandler != IntPtr.Zero)
{
CryptoApi.CryptReleaseContext(cspHandler, 0);
}
}
}
/// <summary>
/// Освобождает ресурсы.
/// </summary>
public void Dispose()
{
if (disposed)
{
return;
}
if (cspHandler != IntPtr.Zero)
{
CryptoApi.CryptReleaseContext(cspHandler, 0);
cspHandler = IntPtr.Zero;
}
disposed = true;
}
