private void SendSign(SSH2DataReader r)
{
byte[] blob = r.ReadString();
byte[] data = r.ReadString();
//Debug.WriteLine(String.Format("SignRequest blobsize={0} datasize={1}", blob.Length, data.Length));
SSH2UserAuthKey[] keys = _client.GetAvailableSSH2UserAuthKeys();
SSH2UserAuthKey key = FindKey(keys, blob);
if (key == null)
{
TransmitWriter(OpenWriter(AgentForwadPacketType.SSH_AGENT_FAILURE));
_client.NotifyPublicKeyDidNotMatch();
}
else
{
SSH2DataWriter signpack = new SSH2DataWriter();
signpack.WriteString(SSH2Util.PublicKeyAlgorithmName(key.Algorithm));
signpack.WriteAsString(key.Sign(data));
SSH2DataWriter wr = OpenWriter(AgentForwadPacketType.SSH2_AGENT_SIGN_RESPONSE);
wr.WriteAsString(signpack.ToByteArray());
TransmitWriter(wr);
}
}
/// <summary>
/// SSH2 private key signature
/// </summary>
private void SSH2Sign(byte[] blob, byte[] data, uint flags)
{
if ((flags & SSH_AGENT_OLD_SIGNATURE) != 0)
{
SendFailure();
return;
}
SSH2UserAuthKey key = SSH2FindKey(blob);
if (key == null)
{
SendFailure();
return;
}
SSH2PayloadImageBuilder image = new SSH2PayloadImageBuilder();
image.WriteString(SSH2Util.PublicKeyAlgorithmName(key.Algorithm));
image.WriteAsString(key.Sign(data));
byte[] signatureBlob = image.GetBytes();
Send(
new OpenSSHAgentForwardingMessage(OpenSSHAgentForwardingMessageType.SSH2_AGENT_SIGN_RESPONSE)
.WriteAsString(signatureBlob)
);
}