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Private key login from windows and mingw


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Hello list,

I'm having some trouble understanding how to login using a private key.
This is what I do:

my_ssh_session = ssh_new();
ssh_options_set(my_ssh_session, SSH_OPTIONS_HOST, server);
ssh_options_set(my_ssh_session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);
ssh_options_set(my_ssh_session, SSH_OPTIONS_PORT, &port);

privkey = privatekey_from_file(my_ssh_session, "C:\\data\\privatekey",
0, "pass");

rc = ssh_userauth_pubkey(my_ssh_session, "root", NULL, privkey);
if(rc != SSH_AUTH_SUCCESS)
	error....

privatekey_free(privkey);
...

And the output I get says:
[1] Trying to open C:\data\privatekey
[1] Trying to read C:\data\privatekey, passphase=true, authcb=false
[3] Writing on the wire a packet having 17 bytes before
[3] 17 bytes after comp + 10 padding bytes = 28 bytes packet
[1] Error : Writing packet: error on socket (or connection closed):
Unknown error
[3] Sent SSH_MSG_SERVICE_REQUEST (service ssh-userauth)


I've been trying to follow the examples and I've read the api, the
documentation and even part of the source code but I don't understand
what is happening here.
By the way, my ssh server only accepts certificate login, however I
can login using Putty (with a copy of the same certificate exported to
be putty-compatible), and I can also login to ssh from other programs
such as MySQL Workbench using exactly the same certificate.

In fact, I could connect when my server was configured to use a
password login, but I wanted more security than just a plain password.
That's why I am confused about the socket error...

I'm using the precompiled binaries for MinGW, version 0.5.2-1

Any idea?
And thanks in advance,

Alfonso Arbona
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Follow-Ups:
Re: Private key login from windows and mingwAris Adamantiadis <aris@xxxxxxxxxxxx>
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