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-.\"  -*- nroff -*-
-.\"
-.\" ssh-keygen.1
-.\"
-.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
-.\"
-.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
-.\"                    All rights reserved
-.\"
-.\" Created: Sat Apr 22 23:55:14 1995 ylo
-.\"
-.\" $Id: ssh-keygen.1,v 1.18 2000/05/08 17:26:04 hugh Exp $
-.\"
-.Dd September 25, 1999
-.Dt SSH-KEYGEN 1
-.Os
-.Sh NAME
-.Nm ssh-keygen
-.Nd authentication key generation
-.Sh SYNOPSIS
-.Nm ssh-keygen
-.Op Fl dq
-.Op Fl b Ar bits
-.Op Fl N Ar new_passphrase
-.Op Fl C Ar comment
-.Op Fl f Ar keyfile
-.Nm ssh-keygen
-.Fl p
-.Op Fl P Ar old_passphrase
-.Op Fl N Ar new_passphrase
-.Op Fl f Ar keyfile
-.Nm ssh-keygen
-.Fl x
-.Op Fl f Ar keyfile
-.Nm ssh-keygen
-.Fl X
-.Op Fl f Ar keyfile
-.Nm ssh-keygen
-.Fl y
-.Op Fl f Ar keyfile
-.Nm ssh-keygen
-.Fl c
-.Op Fl P Ar passphrase
-.Op Fl C Ar comment
-.Op Fl f Ar keyfile
-.Nm ssh-keygen
-.Fl l
-.Op Fl f Ar keyfile
-.Nm ssh-keygen
-.Fl R
-.Sh DESCRIPTION
-.Nm
-generates and manages authentication keys for
-.Xr ssh 1 .
-.Nm
-defaults to generating an RSA key for use by protocols 1.3 and 1.5;
-specifying the
-.Fl d
-flag will create a DSA key instead for use by protocol 2.0.
-.Pp
-Normally each user wishing to use SSH
-with RSA or DSA authentication runs this once to create the authentication
-key in
-.Pa $HOME/.ssh/identity
-or
-.Pa $HOME/.ssh/id_dsa .
-Additionally, the system administrator may use this to generate host keys,
-as seen in
-.Pa /etc/rc .
-.Pp
-Normally this program generates the key and asks for a file in which
-to store the private key.
-The public key is stored in a file with the same name but
-.Dq .pub
-appended.
-The program also asks for a passphrase.
-The passphrase may be empty to indicate no passphrase
-(host keys must have empty passphrase), or it may be a string of
-arbitrary length.
-Good passphrases are 10-30 characters long and are
-not simple sentences or otherwise easily guessable (English
-prose has only 1-2 bits of entropy per word, and provides very bad
-passphrases).
-The passphrase can be changed later by using the
-.Fl p
-option.
-.Pp
-There is no way to recover a lost passphrase.
-If the passphrase is
-lost or forgotten, you will have to generate a new key and copy the
-corresponding public key to other machines.
-.Pp
-For RSA, there is also a comment field in the key file that is only for
-convenience to the user to help identify the key.
-The comment can tell what the key is for, or whatever is useful.
-The comment is initialized to
-.Dq user@host
-when the key is created, but can be changed using the
-.Fl c
-option.
-.Pp
-After a key is generated, instructions below detail where the keys
-should be placed to be activated.
-.Pp
-The options are as follows:
-.Bl -tag -width Ds
-.It Fl b Ar bits
-Specifies the number of bits in the key to create.
-Minimum is 512 bits.
-Generally 1024 bits is considered sufficient, and key sizes
-above that no longer improve security but make things slower.
-The default is 1024 bits.
-.It Fl c
-Requests changing the comment in the private and public key files.
-The program will prompt for the file containing the private keys, for
-passphrase if the key has one, and for the new comment.
-.It Fl f
-Specifies the filename of the key file.
-.It Fl l
-Show fingerprint of specified private or public key file.
-.It Fl p
-Requests changing the passphrase of a private key file instead of
-creating a new private key.
-The program will prompt for the file
-containing the private key, for the old passphrase, and twice for the
-new passphrase.
-.It Fl q
-Silence
-.Nm ssh-keygen .
-Used by
-.Pa /etc/rc
-when creating a new key.
-.It Fl C Ar comment
-Provides the new comment.
-.It Fl N Ar new_passphrase
-Provides the new passphrase.
-.It Fl P Ar passphrase
-Provides the (old) passphrase.
-.It Fl R
-If RSA support is functional, immediately exits with code 0.  If RSA
-support is not functional, exits with code 1.  This flag will be
-removed once the RSA patent expires.
-.It Fl x
-This option will read a private
-OpenSSH DSA format file and print a SSH2-compatible public key to stdout.
-.It Fl X
-This option will read a
-SSH2-compatible public key file and print an OpenSSH DSA compatible public key to stdout.
-.It Fl y
-This option will read a private
-OpenSSH DSA format file and print an OpenSSH DSA public key to stdout.
-.El
-.Sh FILES
-.Bl -tag -width Ds
-.It Pa $HOME/.ssh/identity
-Contains the RSA authentication identity of the user.
-This file should not be readable by anyone but the user.
-It is possible to
-specify a passphrase when generating the key; that passphrase will be
-used to encrypt the private part of this file using 3DES.
-This file is not automatically accessed by
-.Nm
-but it is offered as the default file for the private key.
-.Xr sshd 8
-will read this file when a login attempt is made.
-.It Pa $HOME/.ssh/identity.pub
-Contains the public key for authentication.
-The contents of this file should be added to
-.Pa $HOME/.ssh/authorized_keys
-on all machines
-where you wish to log in using RSA authentication.
-There is no need to keep the contents of this file secret.
-.It Pa $HOME/.ssh/id_dsa
-Contains the DSA authentication identity of the user.
-This file should not be readable by anyone but the user.
-It is possible to
-specify a passphrase when generating the key; that passphrase will be
-used to encrypt the private part of this file using 3DES.
-This file is not automatically accessed by
-.Nm
-but it is offered as the default file for the private key.
-.Xr sshd 8
-will read this file when a login attempt is made.
-.It Pa $HOME/.ssh/id_dsa.pub
-Contains the public key for authentication.
-The contents of this file should be added to
-.Pa $HOME/.ssh/authorized_keys2
-on all machines
-where you wish to log in using DSA authentication.
-There is no need to keep the contents of this file secret.
-.Sh AUTHOR
-Tatu Ylonen <ylo@cs.hut.fi>
-.Pp
-OpenSSH
-is a derivative of the original (free) ssh 1.2.12 release, but with bugs
-removed and newer features re-added.
-Rapidly after the 1.2.12 release,
-newer versions bore successively more restrictive licenses.
-This version of OpenSSH
-.Bl -bullet
-.It
-has all components of a restrictive nature (i.e., patents, see
-.Xr ssl 8 )
-directly removed from the source code; any licensed or patented components
-are chosen from
-external libraries.
-.It
-has been updated to support ssh protocol 1.5.
-.It
-contains added support for
-.Xr kerberos 8
-authentication and ticket passing.
-.It
-supports one-time password authentication with
-.Xr skey 1 .
-.El
-.Pp
-The libraries described in
-.Xr ssl 8
-are required for proper operation.
-.Sh SEE ALSO
-.Xr ssh 1 ,
-.Xr ssh-add 1 ,
-.Xr ssh-agent 1 ,
-.Xr sshd 8 ,
-.Xr ssl 8