public RSAKeyPair(BigInteger e, BigInteger d, BigInteger n, BigInteger u, BigInteger p, BigInteger q)
{
_publickey = new RSAPublicKey(e, n);
_d = d;
_u = u;
_p = p;
_q = q;
}
private void VerifyHostKeyByRSA(SSH2DataReader pubkey, byte[] sigbody, byte[] hash)
{
BigInteger exp = pubkey.ReadMPInt();
BigInteger mod = pubkey.ReadMPInt();
Debug.Assert(pubkey.Rest==0);
//Debug.WriteLine(exp.ToHexString());
//Debug.WriteLine(mod.ToHexString());
RSAPublicKey pk = new RSAPublicKey(exp, mod);
pk.VerifyWithSHA1(sigbody, new SHA1CryptoServiceProvider().ComputeHash(hash));
_cInfo._hostkey = pk;
}
private void SendSessionKey(byte[] session_key)
{
try
{
//step1 XOR with session_id
byte[] working_data = new byte[session_key.Length];
byte[] session_id = CalcSessionID();
Array.Copy(session_key, 0, working_data, 0, session_key.Length);
for(int i=0; i<session_id.Length; i++) working_data[i] ^= session_id[i];
//step2 decrypts with RSA
RSAPublicKey first_encryption;
RSAPublicKey second_encryption;
SSHServerInfo si = _cInfo._serverinfo;
int first_key_bytelen, second_key_bytelen;
if(si.server_key_bits < si.host_key_bits)
{
first_encryption = new RSAPublicKey(si.server_key_public_exponent, si.server_key_public_modulus);
second_encryption = new RSAPublicKey(si.host_key_public_exponent, si.host_key_public_modulus);
first_key_bytelen = (si.server_key_bits+7)/8;
second_key_bytelen = (si.host_key_bits+7)/8;
}
else
{
first_encryption = new RSAPublicKey(si.host_key_public_exponent, si.host_key_public_modulus);
second_encryption = new RSAPublicKey(si.server_key_public_exponent, si.server_key_public_modulus);
first_key_bytelen = (si.host_key_bits+7)/8;
second_key_bytelen = (si.server_key_bits+7)/8;
}
BigInteger first_result = RSAUtil.PKCS1PadType2(new BigInteger(working_data), first_key_bytelen, _param.Random).modPow(first_encryption.Exponent, first_encryption.Modulus);
BigInteger second_result = RSAUtil.PKCS1PadType2(first_result, second_key_bytelen, _param.Random).modPow(second_encryption.Exponent, second_encryption.Modulus);
//output
SSH1DataWriter writer = new SSH1DataWriter();
writer.Write((byte)_cInfo._algorithmForTransmittion);
writer.Write(si.anti_spoofing_cookie);
writer.Write(second_result);
writer.Write(0); //protocol flags
//send
SSH1Packet SSH1Packet = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_SESSION_KEY, writer.ToByteArray());
SSH1Packet.WriteTo(_stream);
_sessionID = session_id;
}
catch(Exception e)
{
if(e is IOException)
throw (IOException)e;
else
{
string t = e.StackTrace;
throw new SSHException(e.Message); //IOException�ȊO�݂͂�SSHException�ɂ��Ă��܂�
}
}
}
