internal static void Print(Formatter formatter, string groupName)
{
SGNames sgNameEnum = GetSGName(groupName);
SGParams sgp = SubgroupRecommendedParameters.sgParams[(int)sgNameEnum];
sgp.Oid = SubgroupRecommendedParameters.OID[(int)sgNameEnum];
formatter.PrintText("OID", "UCHAR", null, sgp.Oid);
formatter.PrintBigInteger("p", "UCHAR", null, sgp.p);
formatter.PrintBigInteger("q", "UCHAR", null, sgp.q);
formatter.PrintBigInteger("g", "UCHAR", null, sgp.g);
formatter.PrintHex("domainParamSeed", "UCHAR", null, sgp.domain_parameter_seed);
formatter.PrintBigInteger("e", "UCHAR", null, sgp.e);
// g_1 ... g_n
for (int i = 1; i <= NumberOfPregeneratedGenerators; i++)
{
formatter.PrintBigInteger("g" + i, "UCHAR", null, sgp.g_i[i - 1], sgp.counter[i - 1]);
}
// g_t
formatter.PrintBigInteger("gt", "UCHAR", null, sgp.g_t, sgp.counter_t);
// g_d
formatter.PrintBigInteger("gd", "UCHAR", null, sgp.g_d, sgp.counter_d);
}
static public SGParams GenerateParameters(string groupName)
{
SGParams sgParams = new SGParams();
SGNames sgNameEnum = GetSGName(groupName);
SGParams sgp = SubgroupRecommendedParameters.sgParams[(int)sgNameEnum];
sgParams.Oid = SubgroupRecommendedParameters.OID[(int)sgNameEnum];
if (sgNameEnum == SGNames.L1024N160)
{
sgParams.p = new BigInteger(1, L1024N160.p);
sgParams.q = new BigInteger(1, L1024N160.q);
sgParams.domain_parameter_seed = L1024N160.domainParameterSeed;
}
else if (sgNameEnum == SGNames.L2048N256)
{
sgParams.p = new BigInteger(1, L2048N256.p);
sgParams.q = new BigInteger(1, L2048N256.q);
sgParams.domain_parameter_seed = L2048N256.domainParameterSeed;
}
else if (sgNameEnum == SGNames.L3072N256)
{
sgParams.p = new BigInteger(1, L3072N256.p);
sgParams.q = new BigInteger(1, L3072N256.q);
sgParams.domain_parameter_seed = L3072N256.domainParameterSeed;
}
else
{
throw new ArgumentException("unsupported group: " + sgNameEnum);
}
// g
sgParams.g = FIPS_186_3_AnnexA_2_3(sgParams.p, sgParams.q, sgParams.domain_parameter_seed, 0, null, out sgParams.counter_g);
// e = (p-1)/q (for verifiably random group generation)
sgParams.e = sgParams.p.Subtract(BigInteger.One).Divide(sgParams.q);
// g_1 ... g_n
sgParams.g_i = new BigInteger[NumberOfPregeneratedGenerators];
sgParams.counter = new int[NumberOfPregeneratedGenerators];
for (int i = 1; i <= NumberOfPregeneratedGenerators; i++)
{
sgParams.g_i[i - 1] = FIPS_186_3_AnnexA_2_3(sgParams.p, sgParams.q, sgParams.domain_parameter_seed, (byte)i, null, out sgParams.counter[i - 1]);
}
// g_t
sgParams.g_t = FIPS_186_3_AnnexA_2_3(sgParams.p, sgParams.q, sgParams.domain_parameter_seed, 255, null, out sgParams.counter_t);
// g_d
sgParams.g_d = FIPS_186_3_AnnexA_2_3(sgParams.p, sgParams.q, sgParams.domain_parameter_seed, 254, null, out sgParams.counter_d);
return(sgParams);
}
