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;
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="hostName">host name</param>
/// <param name="portNumber">port number</param>
/// <param name="hostKey">host key</param>
public SSH1HostKeyInformationProvider(string hostName, int portNumber, RSAPublicKey hostKey)
{
HostName = hostName;
PortNumber = portNumber;
_hostKey = hostKey;
_knownHostsString =
new Lazy<string>(
() => {
// Poderosa known_hosts format
return new StringBuilder()
.Append("ssh1 ")
.Append(Encoding.ASCII.GetString(Base64.Encode(_encodedHostKey.Value)))
.ToString();
},
false
);
_encodedHostKey =
new Lazy<byte[]>(
() => {
return new SSH1PayloadImageBuilder(0x10000)
.WriteBigInteger(_hostKey.Exponent)
.WriteBigInteger(_hostKey.Modulus)
.GetBytes();
},
false
);
}
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;
}
Rng rng = RngManager.GetSecureRng();
BigInteger first_result = RSAUtil.PKCS1PadType2(new BigInteger(working_data), first_key_bytelen, rng).modPow(first_encryption.Exponent, first_encryption.Modulus);
BigInteger second_result = RSAUtil.PKCS1PadType2(first_result, second_key_bytelen, rng).modPow(second_encryption.Exponent, second_encryption.Modulus);
//output
SSH1DataWriter writer = new SSH1DataWriter();
writer.WriteByte((byte)_cInfo._algorithmForTransmittion);
writer.Write(si.anti_spoofing_cookie);
writer.WriteBigInteger(second_result);
writer.WriteInt32(0); //protocol flags
//send
TraceTransmissionEvent(PacketType.SSH_CMSG_SESSION_KEY, "sent encrypted session-keys");
SSH1Packet packet = SSH1Packet.FromPlainPayload(PacketType.SSH_CMSG_SESSION_KEY, writer.ToByteArray());
packet.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以外はみなSSHExceptionにしてしまう
}
}
}
private RSAPublicKey ReadRSAPublicKey(SSH2DataReader pubkey, byte[] sigbody, byte[] hash)
{
BigInteger exp = pubkey.ReadMPInt();
BigInteger mod = pubkey.ReadMPInt();
Debug.Assert(pubkey.RemainingDataLength == 0);
RSAPublicKey pk = new RSAPublicKey(exp, mod);
return pk;
}