internal static FieldZqElement GenerateIssuerParametersCryptoData()

in UProveCrypto/ProtocolHelper.cs [66:116]
43 lines of code
9 McCabe index (conditional complexity)

        internal static FieldZqElement GenerateIssuerParametersCryptoData(IssuerParameters ip, GroupElement[] gValues, bool supportDevice)
        {
            if (ip == null)
            {
                throw new ArgumentNullException("ip");
            }
            if (ip.Gq == null)
            {
                throw new ArgumentException("Group description is not set");
            }
            int n = ip.E == null ? 0 : ip.E.Length;
            Group Gq = ip.Gq;
            ip.G = new GroupElement[n + 2];

            FieldZqElement privateKey;
            if (gValues == null)
            {
                FieldZqElement[] y = ip.Zq.GetRandomElements(n + 2, false);
                privateKey = y[0];

                for (int i = 0; i < (n + 2); i++)
                {
                    ip.G[i] = Gq.G.Exponentiate(y[i]);
                }
            }
            else
            {
                // g_0
                privateKey = ip.Zq.GetRandomElement(false);
                ip.G[0] = Gq.G.Exponentiate(privateKey);

                // g_1,..,g_n
                for (int i = 1; i < (n + 1); i++)
                {
                    ip.G[i] = gValues[i - 1];
                }

                // g_t
                int t = n + 1;
                ip.G[t] = gValues[gValues.Length - 1];
            }

            if (supportDevice)
            {
                if (ip.Gd == null)
                {
                    ip.Gd = Gq.G.Exponentiate(ip.Zq.GetRandomElement(false));
                }
            }
            return privateKey;
        }