private void Start()
{
byte[] seed = System.Text.Encoding.ASCII.GetBytes("38pyb2p8yn2ybauynf874t");
byte[] remote_public_key;
byte[] public_key;
byte[] key;
DH.RandSeed(seed);
DH.New();
DH.GenerateKey(out remote_public_key);
DH.Free();
DH.New();
DH.GenerateKey(out public_key);
DH.ComputeKey(out key, remote_public_key);
DH.Free();
Debug.Log($"remote_public_key : {BitConverter.ToString(remote_public_key)}");
Debug.Log($"public_key : {BitConverter.ToString(public_key)}");
Debug.Log($"key : {BitConverter.ToString(key)}");
}
public void HandleClientKeyPacket(string publicKey, ref GameCryptography crypto)
{
var key = _keyExchange.ComputeKey(BigNumber.FromHexString(publicKey));
crypto.SetKey(key);
crypto.SetIvs(_clientIV, _serverIV);
}
public void Execute(string[] args)
{
OpenSSL.Core.Random.Seed(rnd_seed);
BigNumber.GeneratorHandler cb = new BigNumber.GeneratorHandler(this.OnStatus);
DH a = new DH(64, DH.Generator5, cb, Console.Out);
DH.CheckCode check = a.Check();
if ((check & DH.CheckCode.CheckP_NotPrime) != 0)
{
Console.WriteLine("p value is not prime");
}
if ((check & DH.CheckCode.CheckP_NotSafePrime) != 0)
{
Console.WriteLine("p value is not safe prime");
}
if ((check & DH.CheckCode.UnableToCheckGenerator) != 0)
{
Console.WriteLine("unable to check the generator value");
}
if ((check & DH.CheckCode.NotSuitableGenerator) != 0)
{
Console.WriteLine("the g value is not a generator");
}
Console.WriteLine();
Console.WriteLine("p ={0}", a.P);
Console.WriteLine("g ={0}", a.G);
DH b = new DH(a.P, a.G);
a.NoExpConstantTime = false;
b.NoExpConstantTime = true;
a.GenerateKeys();
Console.WriteLine("pri 1={0}", a.PrivateKey);
Console.WriteLine("pub 1={0}", a.PublicKey);
b.GenerateKeys();
Console.WriteLine("pri 2={0}", b.PrivateKey);
Console.WriteLine("pub 2={0}", b.PublicKey);
byte[] aout = a.ComputeKey(b.PublicKey);
string astr = BitConverter.ToString(aout);
Console.WriteLine("key1 ={0}", astr);
byte[] bout = b.ComputeKey(a.PublicKey);
string bstr = BitConverter.ToString(bout);
Console.WriteLine("key2 ={0}", bstr);
if (aout.Length < 4 || astr != bstr)
{
throw new Exception("Error in DH routines");
}
a.Dispose();
b.Dispose();
}
private void button1_Click(object sender, EventArgs e)
{
byte[] lpPublicKey = bytBase64_decode(richTextBox3.Text); //GSYCGAATBase64Decode(&lpPublicKey, m_lpPublicKeyString, m_dwPublicKeyStringLength)
byte[] lpEncryptedSecret = bytBase64_decode(richTextBox4.Text); //GSYCGAATBase64Decode(&lpEncryptedSecret, m_strEncryptedSecretString, iLength)
byte[] lpPrivatekey = CS_DH.ComputeKey(BigNumber.FromArray(lpPublicKey)); //lpPublicKeyBN = BN_bin2bn(lpPublicKey, iPublicKeyLength, NULL) + DH_compute_key(lpPrivatekey, lpPublicKeyBN, pDH)
SHA256 sha256 = new SHA256CryptoServiceProvider();
byte[] bytSecureHashAlgorithmCode = sha256.ComputeHash(lpPrivatekey); //GSYCGAATSHA256(bytSecureHashAlgorithmCode, lpPrivatekey, iPrivatekeyLength);
byte[] bytAESKey = new byte[16];
Array.Copy(bytSecureHashAlgorithmCode, 16, bytAESKey, 0, bytAESKey.Length); //memcpy(bytAESKey, &(bytSecureHashAlgorithmCode[GSYCGAAT_SHA256_CODE_LENGTH / 2]), GSYCGAAT_AES_KEY_LENGTH);
SyrisAES.KeySize keysize;
keysize = SyrisAES.KeySize.Bits128;
Array.Copy(bytAESKey, 0, SyrisAES.AESKey, 0, SyrisAES.AESKey.Length);
SyrisAES a = new SyrisAES(keysize);
byte[] outputByteArray = new byte[16];
a.UnAES(lpEncryptedSecret, outputByteArray); //GSYCGAATAES128ECBDecrypt((*lpSecret), lpSecretCipher, GSYCGAAT_AES_UNIT_LENGTH, bytAESKey)
richTextBox5.Text = ToHexString(outputByteArray); //GSYCGAATBinaryToHEXString(strSecretCodeString, m_bytSecretCode, GSYCGAAT_SECRET_LENGTH);
}