Signed SSH key issue with OpenSSH6.4p1

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 Hi All,

Please pardon me if it is the wrong list to ask how-to etc.

I am having an issue with the Signed SSH keys. I am being asked for the
passphrase for my signed public key, even though I don't have any.

I am running CentOS7 with OpenSSH_6.4p1, OpenSSL 1.0.1e-fips 11 Feb 2013.

1) I have ca server with ca user keys (ca-user-key.pub)
2) I created user ssh rsa keys (user-id-org and user-id-org.pub).
3) I signed the "user-id-org.pub" with "ca-user-key.pub" and generated
"signed-user-id-org.pub".
4) I copied " ca-user-key.pub" to the destination server (dest1.domain.com)
and changed "TrustedUserCAKeys /etc/ssh/ ca-user-key.pub" in
/etc/ssh/sshd_config.

5) I am trying to get into "dest1.domain.com" using the " user-id-org "  as
well as  "signed-user-id-org.pub". [ ssh -i user-id-org -i signed-
user-id-org.pub user1@ dest1.domain.com ]

However, I am being asked for the passphrase for signed-user-id-org.pub
which I don't have. Below is the output the I pasted from the terminal.

[root@lab-linux1 .ssh]# ssh -i user-id-org -i signed-user-id-org.pub user1@
dest1.domain.com
Enter passphrase for key '/root/.ssh/ signed-user-id-org .pub':
Enter passphrase for key '/root/.ssh/ signed-user-id-org .pub':
Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

But, If I change the ssh key names to id_rsa, id_rsa.pub and
id_rsa-cert.pub with simple using either " id_rsa " or " id_rsa-cert", I
can do SSH with out any issues and without any prompting. I am confused
here and I don't understand why I have to use only the id-rsa as opposed to
any name that I am pointing using the file path.

Failed scenarios:

   1. I tried giving the options using -o i.e (ssh -o 'IdentityFile
   /root/.ssh/id_rsa' -o 'CertificateFile /root/.ssh/signed-cert.pub'
   root@xxxxxxxxxxxxxxx).

·         command-line: line 0: Bad configuration option: certificatefile



2.    Tried by changing the ~/.ssh/config or /etc/ssh/ssh_config

·         same problem, it says Bad configuration option: certificatefile



3.    Tried renaming the files to test_id_rsa and test_id_rsa.pub and
test_id_rsa-cert.pub.

·         Asking for the passphrase of the signed cert.

Successful Scenarios:

1.    When I rename all the keys to the default named id_rsa, id_rsa.pub
and id_rsa-cert.pub.

·         No issues, I could ssh into the servers using either private key
or signed key. [assuming the file names are being automatically taken from
a switch case in the code base.]

What Should I do?

   - Can anyone suggest me how to get around this issue. I want to use my
   own naming convention and my custom location to the keys?


 Any help is appreciated and  Thanks in advance.

NK.
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