How to fix buffer_get_ret: trying to get more bytes 4 than in buffer

I got this error after adding new user to the system (CentOS). The user key is generated using PuTTY Key Generator (PuTTYgen for short).

Exact error (in /var/log/secure):
...
Apr 3 08:57:13 hostname sshd[28041]: error: buffer_get_ret: trying to get more bytes 4 than in buffer 0
Apr 3 08:57:13 hostname sshd[28041]: fatal: buffer_get_int: buffer error
Apr 3 08:58:23 hostname sshd[29722]: error: buffer_get_ret: trying to get more bytes 4 than in buffer 0
Apr 3 08:58:23 hostname sshd[29722]: fatal: buffer_get_int: buffer error
Apr 3 08:59:20 hostname sshd[30331]: error: buffer_get_ret: trying to get more bytes 4 than in buffer 0
Apr 3 08:59:20 hostname sshd[30331]: fatal: buffer_get_int: buffer error
...

Check your SSH key for extra line.

It should be someting like this:
ssh-rsa xipHymgupZdTaSvXsO2uAJ8fGvyx6kTkO/lIqF6fOayYnllq9Vf4DX9XRaUH8tCN34Vu7jJi5ZjuHe35xipHymgupZdTaSvXsO2uAJ8fGvyx6kTkOID735f2myg90XQDJRwRL5PtU0HJKM7dlJ33$
rsa-key-20100403

Not like this:
ssh-rsa
xipHymgupZdTaSvXsO2uAJ8fGvyx6kTkO/lIqF6fOayYnllq9Vf4DX9XRaUH8tCN34Vu7jJi5ZjuHe35xipHymgupZdTaSvXsO2uAJ8fGvyx6kTkOID735f2myg90XQDJRwRL5PtU0HJKM7dlJ33$
rsa-key-20100403

Notice the hard return after ssh-rsa.

The key was copy-pasted from PuTTYgen to nano. Apparently, PuTTYgen add extra hard return after ssh-rsa, see screenshot:

buffer_get_ret trying to get more bytes 4 than in buffer 0 buffer error

buffer_get_ret trying to get more bytes 4 than in buffer 0 buffer error

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I am nothing special, of this I am sure. I am a common man with common thoughts and I’ve led a common life. There are no monuments dedicated to me and my name will soon be forgotten, but I’ve loved another with all my heart and soul, and to me, this has always been enough.

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