CryptAcquireContext(out prov, null, "Crypto-Pro GOST R 34.10-2012 Cryptographic Service Provider", 80, CRYPT_VERIFYCONTEXT);

dwFlags = 1;

            if (!CryptGetProvParam(prov, PP_ENUMALGS_EX, IntPtr.Zero, ref len, dwFlags))
            {
            }
            data = Marshal.AllocHGlobal(len);
            do
            {
                if (!CryptGetProvParam(prov, PP_ENUMALGS_EX, data, ref len, dwFlags))
                {
                    break;
                }

                PROV_ENUMALGS_EX pInfo = (PROV_ENUMALGS_EX)Marshal.PtrToStructure(data, typeof(PROV_ENUMALGS_EX));
                Console.WriteLine("aiAlgid: " + pInfo.aiAlgid + " - " + pInfo.szLongName);

                byte[] arDataAlg = BitConverter.GetBytes(pInfo.aiAlgid);
                IntPtr hDataAlg = Marshal.AllocHGlobal(arDataAlg.Length);
                Marshal.Copy(arDataAlg, 0, hDataAlg, arDataAlg.Length);
                
                hHashAlgInfo = CryptFindOIDInfo(OidKeyType.AlgoritmID, hDataAlg, OidGroup.AllGroups);

                if (hHashAlgInfo == IntPtr.Zero)
                {
                    var a = new Win32Exception(Marshal.GetLastWin32Error());
                }
                try
                {
                    CRYPT_OID_INFO pHashAlgInfo = (CRYPT_OID_INFO)Marshal.PtrToStructure(hHashAlgInfo, typeof(CRYPT_OID_INFO));
                    string _sOID = pHashAlgInfo.pszOID;
                    string _pwszName = pHashAlgInfo.pwszName;
                    Console.WriteLine("         " + _sOID + ",  -  " + _pwszName + ", dwGroupId: " + (OidGroup)pHashAlgInfo.dwGroupId);
                }