NamedGroup
RFC 7919
namespace Org.BouncyCastle.Tls
{
public abstract class NamedGroup
{
public const int sect163k1 = 1;
public const int sect163r1 = 2;
public const int sect163r2 = 3;
public const int sect193r1 = 4;
public const int sect193r2 = 5;
public const int sect233k1 = 6;
public const int sect233r1 = 7;
public const int sect239k1 = 8;
public const int sect283k1 = 9;
public const int sect283r1 = 10;
public const int sect409k1 = 11;
public const int sect409r1 = 12;
public const int sect571k1 = 13;
public const int sect571r1 = 14;
public const int secp160k1 = 15;
public const int secp160r1 = 16;
public const int secp160r2 = 17;
public const int secp192k1 = 18;
public const int secp192r1 = 19;
public const int secp224k1 = 20;
public const int secp224r1 = 21;
public const int secp256k1 = 22;
public const int secp256r1 = 23;
public const int secp384r1 = 24;
public const int secp521r1 = 25;
public const int brainpoolP256r1 = 26;
public const int brainpoolP384r1 = 27;
public const int brainpoolP512r1 = 28;
public const int x25519 = 29;
public const int x448 = 30;
public const int brainpoolP256r1tls13 = 31;
public const int brainpoolP384r1tls13 = 32;
public const int brainpoolP512r1tls13 = 33;
public const int GC256A = 34;
public const int GC256B = 35;
public const int GC256C = 36;
public const int GC256D = 37;
public const int GC512A = 38;
public const int GC512B = 39;
public const int GC512C = 40;
public const int curveSM2 = 41;
public const int ffdhe2048 = 256;
public const int ffdhe3072 = 257;
public const int ffdhe4096 = 258;
public const int ffdhe6144 = 259;
public const int ffdhe8192 = 260;
public const int arbitrary_explicit_prime_curves = 65281;
public const int arbitrary_explicit_char2_curves = 65282;
public const int MLKEM512 = 512;
public const int MLKEM768 = 513;
public const int MLKEM1024 = 514;
public const int SecP256r1MLKEM768 = 4587;
public const int X25519MLKEM768 = 4588;
public const int SecP384r1MLKEM1024 = 4589;
private static readonly string[] CurveNames = new string[41] {
"sect163k1",
"sect163r1",
"sect163r2",
"sect193r1",
"sect193r2",
"sect233k1",
"sect233r1",
"sect239k1",
"sect283k1",
"sect283r1",
"sect409k1",
"sect409r1",
"sect571k1",
"sect571r1",
"secp160k1",
"secp160r1",
"secp160r2",
"secp192k1",
"secp192r1",
"secp224k1",
"secp224r1",
"secp256k1",
"secp256r1",
"secp384r1",
"secp521r1",
"brainpoolP256r1",
"brainpoolP384r1",
"brainpoolP512r1",
"X25519",
"X448",
"brainpoolP256r1",
"brainpoolP384r1",
"brainpoolP512r1",
"Tc26-Gost-3410-12-256-paramSetA",
"GostR3410-2001-CryptoPro-A",
"GostR3410-2001-CryptoPro-B",
"GostR3410-2001-CryptoPro-C",
"Tc26-Gost-3410-12-512-paramSetA",
"Tc26-Gost-3410-12-512-paramSetB",
"Tc26-Gost-3410-12-512-paramSetC",
"sm2p256v1"
};
private static readonly string[] FiniteFieldNames = new string[5] {
"ffdhe2048",
"ffdhe3072",
"ffdhe4096",
"ffdhe6144",
"ffdhe8192"
};
public static bool CanBeNegotiated(int namedGroup, ProtocolVersion version)
{
if ((uint)(namedGroup - 23) <= 2 || (uint)(namedGroup - 29) <= 1)
return true;
if (RefersToASpecificFiniteField(namedGroup))
return true;
bool flag = TlsUtilities.IsTlsV13(version);
if (RefersToASpecificCurve(namedGroup)) {
if ((uint)(namedGroup - 31) <= 2 || namedGroup == 41)
return flag;
return !flag;
}
if (RefersToASpecificHybrid(namedGroup) || RefersToASpecificKem(namedGroup))
return flag;
if (namedGroup >= 65281 && namedGroup <= 65282)
return !flag;
return IsPrivate(namedGroup);
}
public static int GetCurveBits(int namedGroup)
{
switch (namedGroup) {
case 15:
case 16:
case 17:
return 160;
case 1:
case 2:
case 3:
return 163;
case 18:
case 19:
return 192;
case 4:
case 5:
return 193;
case 20:
case 21:
return 224;
case 6:
case 7:
return 233;
case 8:
return 239;
case 29:
return 252;
case 22:
case 23:
case 26:
case 31:
case 34:
case 35:
case 36:
case 37:
case 41:
return 256;
case 9:
case 10:
return 283;
case 24:
case 27:
case 32:
return 384;
case 11:
case 12:
return 409;
case 30:
return 446;
case 28:
case 33:
case 38:
case 39:
case 40:
return 512;
case 25:
return 521;
case 13:
case 14:
return 571;
default:
return 0;
}
}
public static string GetCurveName(int namedGroup)
{
if (RefersToASpecificCurve(namedGroup))
return CurveNames[namedGroup - 1];
return null;
}
public static int GetFiniteFieldBits(int namedGroup)
{
switch (namedGroup) {
case 256:
return 2048;
case 257:
return 3072;
case 258:
return 4096;
case 259:
return 6144;
case 260:
return 8192;
default:
return 0;
}
}
public static string GetFiniteFieldName(int namedGroup)
{
if (RefersToASpecificFiniteField(namedGroup))
return FiniteFieldNames[namedGroup - 256];
return null;
}
public static int GetHybridFirst(int namedGroup)
{
switch (namedGroup) {
case 4587:
return 23;
case 4588:
return 513;
case 4589:
return 24;
default:
return -1;
}
}
public static int GetHybridSecond(int namedGroup)
{
switch (namedGroup) {
case 4587:
return 513;
case 4588:
return 29;
case 4589:
return 514;
default:
return -1;
}
}
internal static int (int namedGroup)
{
switch (namedGroup) {
case 23:
return 65;
case 24:
return 97;
case 513:
return 1184;
default:
return -1;
}
}
internal static int (int namedGroup)
{
switch (namedGroup) {
case 23:
return 65;
case 24:
return 97;
case 513:
return 1088;
default:
return -1;
}
}
public static string GetKemName(int namedGroup)
{
switch (namedGroup) {
case 512:
return "ML-KEM-512";
case 513:
return "ML-KEM-768";
case 514:
return "ML-KEM-1024";
default:
return null;
}
}
public static int GetMaximumChar2CurveBits()
{
return 571;
}
public static int GetMaximumCurveBits()
{
return 571;
}
public static int GetMaximumFiniteFieldBits()
{
return 8192;
}
public static int GetMaximumPrimeCurveBits()
{
return 521;
}
public static string GetName(int namedGroup)
{
if (!IsPrivate(namedGroup)) {
switch (namedGroup) {
case 29:
return "x25519";
case 30:
return "x448";
case 31:
return "brainpoolP256r1tls13";
case 32:
return "brainpoolP384r1tls13";
case 33:
return "brainpoolP512r1tls13";
case 34:
return "GC256A";
case 35:
return "GC256B";
case 36:
return "GC256C";
case 37:
return "GC256D";
case 38:
return "GC512A";
case 39:
return "GC512B";
case 40:
return "GC512C";
case 41:
return "curveSM2";
case 512:
return "MLKEM512";
case 513:
return "MLKEM768";
case 514:
return "MLKEM1024";
case 4587:
return "SecP256r1MLKEM768";
case 4588:
return "X25519MLKEM768";
case 4589:
return "SecP384r1MLKEM1024";
case 65281:
return "arbitrary_explicit_prime_curves";
case 65282:
return "arbitrary_explicit_char2_curves";
default: {
string standardName = GetStandardName(namedGroup);
if (standardName != null)
return standardName;
return "UNKNOWN";
}
}
}
return "PRIVATE";
}
public static string GetStandardName(int namedGroup)
{
string curveName = GetCurveName(namedGroup);
if (curveName != null)
return curveName;
string finiteFieldName = GetFiniteFieldName(namedGroup);
if (finiteFieldName != null)
return finiteFieldName;
string kemName = GetKemName(namedGroup);
if (kemName != null)
return kemName;
return null;
}
public static string GetText(int namedGroup)
{
return GetName(namedGroup) + "(" + namedGroup.ToString() + ")";
}
public static bool IsChar2Curve(int namedGroup)
{
if (namedGroup < 1 || namedGroup > 14)
return namedGroup == 65282;
return true;
}
public static bool IsFiniteField(int namedGroup)
{
return (namedGroup & 4294967040) == 256;
}
public static bool IsPrimeCurve(int namedGroup)
{
if (namedGroup < 15 || namedGroup > 41)
return namedGroup == 65281;
return true;
}
public static bool IsPrivate(int namedGroup)
{
if (namedGroup >> 2 != 127)
return namedGroup >> 8 == 254;
return true;
}
public static bool IsValid(int namedGroup)
{
if (!RefersToASpecificGroup(namedGroup) && !IsPrivate(namedGroup)) {
if (namedGroup >= 65281)
return namedGroup <= 65282;
return false;
}
return true;
}
public static bool RefersToAnECDHCurve(int namedGroup)
{
return RefersToASpecificCurve(namedGroup);
}
public static bool RefersToAnECDSACurve(int namedGroup)
{
if (RefersToASpecificCurve(namedGroup))
return !RefersToAnXDHCurve(namedGroup);
return false;
}
public static bool RefersToAnXDHCurve(int namedGroup)
{
if (namedGroup >= 29)
return namedGroup <= 30;
return false;
}
public static bool RefersToASpecificCurve(int namedGroup)
{
if (namedGroup >= 1)
return namedGroup <= 41;
return false;
}
public static bool RefersToASpecificFiniteField(int namedGroup)
{
if (namedGroup >= 256)
return namedGroup <= 260;
return false;
}
public static bool RefersToASpecificGroup(int namedGroup)
{
if (!RefersToASpecificCurve(namedGroup) && !RefersToASpecificFiniteField(namedGroup) && !RefersToASpecificHybrid(namedGroup))
return RefersToASpecificKem(namedGroup);
return true;
}
public static bool RefersToASpecificHybrid(int namedGroup)
{
if ((uint)(namedGroup - 4587) <= 2)
return true;
return false;
}
public static bool RefersToASpecificKem(int namedGroup)
{
if ((uint)(namedGroup - 512) <= 2)
return true;
return false;
}
}
}