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SSH-KEYSIGN(8)            BSD System Manager's Manual           SSH-KEYSIGN(8)
NAME
     ssh-keysign -- ssh helper program for host-based authentication
SYNOPSIS
     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.
     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_ed25519_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.
     /etc/ssh/ssh_host_dsa_key-cert.pub
     /etc/ssh/ssh_host_ecdsa_key-cert.pub
     /etc/ssh/ssh_host_ed25519_key-cert.pub
     /etc/ssh/ssh_host_rsa_key-cert.pub
             If these files exist they are assumed to contain public certifi-
             cate information corresponding with the private keys above.
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 AT openbsd.org>
BSD                               May 2, 2024                              BSD