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    Command:

    ssh-keysign

    
    
    
    

    DESCRIPTION

         ssh-keysign is used by ssh(1) to access the local host keys and generate
         the digital signature required during host-based authentication with SSH
         protocol version 2.
    
         ssh-keysign is disabled by default and can only be enabled in the global
         client configuration file /etc/ssh/ssh_config by setting EnableSSHKeysign
         to "yes".
    
         ssh-keysign is not intended to be invoked by the user, but from ssh(1).
         See ssh(1) and sshd(8) for more information about host-based authentica-
         tion.
    
    
    

    FILES

         /etc/ssh/ssh_config
                 Controls whether ssh-keysign is enabled.
    
         /etc/ssh/ssh_host_dsa_key, /etc/ssh/ssh_host_ecdsa_key,
                 /etc/ssh/ssh_host_rsa_key
                 These files contain the private parts of the host keys used to
                 generate the digital signature.  They should be owned by root,
                 readable only by root, and not accessible to others.  Since they
                 are readable only by root, ssh-keysign must be set-uid root if
                 host-based authentication is used.
    
    
    

    ENVIRONMENT

         SSH_USE_STRONG_RNG
                 The reseeding of the OpenSSL random generator is usually done
                 from /dev/urandom.  If the SSH_USE_STRONG_RNG environment vari-
                 able is set to value other than 0 the OpenSSL random generator is
                 reseeded from /dev/random.  The number of bytes read is defined
                 by the SSH_USE_STRONG_RNG value.  Minimum is 14 bytes.  This set-
                 ting is not recommended on the computers without the hardware
                 random generator because insufficient entropy causes the connec-
                 tion to be blocked until enough entropy is available.
    
    
    

    SEE ALSO

         ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)
    
    
    

    HISTORY

         ssh-keysign first appeared in OpenBSD 3.2.
    
    
    

    AUTHORS

         Markus Friedl <markus@openbsd.org>
    
    
    

    BSD November 20, 2017 BSD

    
    
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