public static byte[] LogonProof(IPacketReader packet)
{
byte[] A = packet.ReadBytes(32);
byte[] kM1 = packet.ReadBytes(20);
byte[] rA = A.Reverse().ToArray();
byte[] AB = A.Concat(B.GetBytes(32).Reverse()).ToArray();
if (new BigInteger(A) % new BigInteger(N) == 0)
{
return(new byte[1]);
}
using (SHA1 sha1 = new SHA1CryptoServiceProvider())
{
// SS_Hash
byte[] rU = sha1.ComputeHash(AB).Reverse().ToArray();
var s = V.ModPow(new BigInteger(rU), new BigInteger(RN)) * new BigInteger(rA);
s = s.ModPow(new BigInteger(RB), new BigInteger(RN));
byte[] S1 = new byte[16], S2 = new byte[16];
byte[] rS = s.GetBytes(32).Reverse().ToArray();
for (int t = 0; t < 16; t++)
{
S1[t] = rS[t * 2];
S2[t] = rS[(t * 2) + 1];
}
byte[] hashS1 = sha1.ComputeHash(S1), hashS2 = sha1.ComputeHash(S2);
byte[] ss_hash = new byte[hashS1.Length + hashS2.Length];
for (int t = 0; t < hashS1.Length; t++)
{
ss_hash[t * 2] = hashS1[t];
ss_hash[(t * 2) + 1] = hashS2[t];
}
// calc M1 & M2
byte[] NHash = sha1.ComputeHash(N);
byte[] GHash = sha1.ComputeHash(G.GetBytes());
var tmp = Enumerable.Range(0, 20)
.Select(t => (byte)(NHash[t] ^ GHash[t]))
.Concat(sha1.ComputeHash(BUsername))
.Concat(Salt)
.Concat(A)
.Concat(B.GetBytes(32).Reverse())
.Concat(ss_hash);
byte[] M1 = sha1.ComputeHash(tmp.ToArray());
byte[] M2 = sha1.ComputeHash(A.Concat(M1).Concat(ss_hash).ToArray());
// instantiate coders/cryptors
PacketCrypt = new PacketCrypt(ss_hash, ClientBuild);
// create packet data
byte[] result = new byte[GetLogonProofSize()];
result[0] = 1;
Array.Copy(M2, 0, result, 2, M2.Length);
return(result);
}
}
public static byte[] LogonProof(IPacketReader packet)
{
byte[] A = packet.ReadBytes(32);
byte[] kM1 = packet.ReadBytes(20);
byte[] rA = A.Reverse().ToArray();
byte[] AB = A.Concat(B.GetBytes(32).Reverse()).ToArray();
if (new BigInteger(A) % new BigInteger(N) == 0)
{
return(new byte[1]);
}
SHA1 sha1 = new SHA1CryptoServiceProvider();
byte[] rU = sha1.ComputeHash(AB).Reverse().ToArray();
// SS_Hash
BigInteger s = V.ModPow(new BigInteger(rU), new BigInteger(RN));
s *= new BigInteger(rA);
s = s.ModPow(new BigInteger(RB), new BigInteger(RN));
byte[] S1 = new byte[16];
byte[] S2 = new byte[16];
byte[] S = s.GetBytes(32);
byte[] rS = S.Reverse().ToArray();
for (int t = 0; t < 16; t++)
{
S1[t] = rS[t * 2];
S2[t] = rS[(t * 2) + 1];
}
byte[] hashS1 = sha1.ComputeHash(S1);
byte[] hashS2 = sha1.ComputeHash(S2);
byte[] ss_hash = new byte[hashS1.Length + hashS2.Length];
for (int t = 0; t < hashS1.Length; t++)
{
ss_hash[t * 2] = hashS1[t];
ss_hash[(t * 2) + 1] = hashS2[t];
}
// calc M1
byte[] M1;
byte[] NHash = sha1.ComputeHash(N);
byte[] GHash = sha1.ComputeHash(G.GetBytes());
byte[] NG_Hash = new byte[20];
for (int t = 0; t < 20; t++)
{
NG_Hash[t] = (byte)(NHash[t] ^ GHash[t]);
}
var tmp = NG_Hash.Concat(sha1.ComputeHash(BUsername))
.Concat(Salt)
.Concat(A)
.Concat(B.GetBytes(32).Reverse())
.Concat(ss_hash);
M1 = sha1.ComputeHash(tmp.ToArray());
// calc M2
byte[] M2;
tmp = A.Concat(M1).Concat(ss_hash);
M2 = sha1.ComputeHash(tmp.ToArray());
sha1.Dispose();
// instantiate coders/cryptors
PacketCrypt = new PacketCrypt(ss_hash, ClientBuild);
// additional information, always zeroed
int extradata = 0;
if (ClientBuild < 6178 || ClientBuild == 6180)
{
extradata = 04; // uint unk
}
else if (ClientBuild < 8089)
{
extradata = 06; // uint unk, ushort unkFlags
}
else
{
extradata = 10; // uint account flag, uint surveyId, ushort unkFlags
}
byte[] result = new byte[22 + extradata];
result[0] = 1;
Array.Copy(M2, 0, result, 2, M2.Length);
return(result);
}