internal bool ComputePublicKeyToServer()
{
bool ret = false;
if (SshPacket.PayLoad[0] == (byte)eSshMsgKexDhGex.SSH_MSG_KEX_DH_GEX_GROUP)
{
m_DhModulesP = new MpInt(SshPacket.PayLoad, 1);
m_DhBaseG = new MpInt(SshPacket.PayLoad, (int)m_DhModulesP.Length + 5);
// Step 3 in DH
//3. C generates a random number x, where 1 < x < (p-1)/2. It computes e = g^x mod p, and sends "e" to S.
RandomSecret = m_Random.Next();
PublicKey = BigInteger.ModPow(m_DhBaseG.Value, RandomSecret, m_DhModulesP.Value);
ret = true;
}
return ret;
}
internal bool ParseServerSshMsgKexDhGexReply()
{
bool ret = false;
int startIndex = 0;
if (SshPacket.PayLoad[startIndex] == (byte)eSshMsgKexDhGex.SSH_MSG_KEX_DH_GEX_REPLY)
{
startIndex = 1;
ServerPublicKeyHostAndCertifcates = new PublicKeyCertifcateFormat(SshPacket.PayLoad, startIndex);
// TODO: program crash here
startIndex += ServerPublicKeyHostAndCertifcates.TotalLength;
DhServerF = new MpInt(SshPacket.PayLoad, startIndex);
startIndex += (int)DhServerF.Length;
KexDhH = new SshString(SshPacket.PayLoad, startIndex);
// Step 5, computes K = f^x mod p
SecretKey = BigInteger.ModPow(DhServerF.Value, this.RandomSecret, this.DhModulesP.Value);
// TODO: check what to do with MAC
ret = true;
}
return ret;
}
public SshRsaKeyFormat(byte[] io_Buffer, int i_StartIndex)
{
E = new MpInt(io_Buffer, i_StartIndex);
N = new MpInt(io_Buffer, i_StartIndex + 4 + (int)E.Length);
// TODO: comlepete rsa_signature_blob
}
