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Diff for /src/usr.bin/ssh/ssh-keygen.1 between version 1.54 and 1.54.2.3

version 1.54, 2002/06/19 00:27:55 version 1.54.2.3, 2003/09/16 21:20:28
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 .Nd authentication key generation, management and conversion  .Nd authentication key generation, management and conversion
 .Sh SYNOPSIS  .Sh SYNOPSIS
 .Nm ssh-keygen  .Nm ssh-keygen
   .Bk -words
 .Op Fl q  .Op Fl q
 .Op Fl b Ar bits  .Op Fl b Ar bits
 .Fl t Ar type  .Fl t Ar type
 .Op Fl N Ar new_passphrase  .Op Fl N Ar new_passphrase
 .Op Fl C Ar comment  .Op Fl C Ar comment
 .Op Fl f Ar output_keyfile  .Op Fl f Ar output_keyfile
   .Ek
 .Nm ssh-keygen  .Nm ssh-keygen
 .Fl p  .Fl p
 .Op Fl P Ar old_passphrase  .Op Fl P Ar old_passphrase
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 .Nm ssh-keygen  .Nm ssh-keygen
 .Fl U Ar reader  .Fl U Ar reader
 .Op Fl f Ar input_keyfile  .Op Fl f Ar input_keyfile
   .Nm ssh-keygen
   .Fl r Ar hostname
   .Op Fl f Ar input_keyfile
   .Op Fl g
   .Nm ssh-keygen
   .Fl G Ar output_file
   .Op Fl b Ar bits
   .Op Fl M Ar memory
   .Op Fl S Ar start_point
   .Nm ssh-keygen
   .Fl T Ar output_file
   .Fl f Ar input_file
   .Op Fl a Ar num_trials
   .Op Fl W Ar generator
 .Sh DESCRIPTION  .Sh DESCRIPTION
 .Nm  .Nm
 generates, manages and converts authentication keys for  generates, manages and converts authentication keys for
 .Xr ssh 1 .  .Xr ssh 1 .
 .Nm  .Nm
 can create RSA keys for use by SSH protocol version 1 and RSA or DSA  can create RSA keys for use by SSH protocol version 1 and RSA or DSA
 keys for use by SSH protocol version 2. The type of key to be generated  keys for use by SSH protocol version 2.
 is specified with the  The type of key to be generated is specified with the
 .Fl t  .Fl t
 option.  option.
 .Pp  .Pp
   .Nm
   is also used to generate groups for use in Diffie-Hellman group
   exchange (DH-GEX).
   See the
   .Sx MODULI GENERATION
   section for details.
   .Pp
 Normally each user wishing to use SSH  Normally each user wishing to use SSH
 with RSA or DSA authentication runs this once to create the authentication  with RSA or DSA authentication runs this once to create the authentication
 key in  key in
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 .Pp  .Pp
 The options are as follows:  The options are as follows:
 .Bl -tag -width Ds  .Bl -tag -width Ds
   .It Fl a Ar trials
   Specifies the number of primality tests to perform when screening DH-GEX
   candidates using the
   .Fl T
   command.
 .It Fl b Ar bits  .It Fl b Ar bits
 Specifies the number of bits in the key to create.  Specifies the number of bits in the key to create.
 Minimum is 512 bits.  Minimum is 512 bits.
 Generally 1024 bits is considered sufficient, and key sizes  Generally, 1024 bits is considered sufficient.
 above that no longer improve security but make things slower.  
 The default is 1024 bits.  The default is 1024 bits.
 .It Fl c  .It Fl c
 Requests changing the comment in the private and public key files.  Requests changing the comment in the private and public key files.
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 to stdout.  to stdout.
 This option allows exporting keys for use by several commercial  This option allows exporting keys for use by several commercial
 SSH implementations.  SSH implementations.
   .It Fl g
   Use generic DNS resource record format.
 .It Fl f Ar filename  .It Fl f Ar filename
 Specifies the filename of the key file.  Specifies the filename of the key file.
 .It Fl i  .It Fl i
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 .It Fl D Ar reader  .It Fl D Ar reader
 Download the RSA public key stored in the smartcard in  Download the RSA public key stored in the smartcard in
 .Ar reader .  .Ar reader .
   .It Fl G Ar output_file
   Generate candidate primes for DH-GEX.
   These primes must be screened for
   safety (using the
   .Fl T
   option) before use.
   .It Fl M Ar memory
   Specify the amount of memory to use (in megabytes) when generating
   candidate moduli for DH-GEX.
 .It Fl N Ar new_passphrase  .It Fl N Ar new_passphrase
 Provides the new passphrase.  Provides the new passphrase.
 .It Fl P Ar passphrase  .It Fl P Ar passphrase
 Provides the (old) passphrase.  Provides the (old) passphrase.
   .It Fl S Ar start
   Specify start point (in hex) when generating candidate moduli for DH-GEX.
   .It Fl T Ar output_file
   Test DH group exchange candidate primes (generated using the
   .Fl G
   option) for safety.
   .It Fl W Ar generator
   Specify desired generator when testing candidate moduli for DH-GEX.
 .It Fl U Ar reader  .It Fl U Ar reader
 Upload an existing RSA private key into the smartcard in  Upload an existing RSA private key into the smartcard in
 .Ar reader .  .Ar reader .
   .It Fl r Ar hostname
   Print DNS resource record with the specified
   .Ar hostname .
 .El  .El
   .Sh MODULI GENERATION
   .Nm
   may be used to generate groups for the Diffie-Hellman Group Exchange
   (DH-GEX) protocol.
   Generating these groups is a two-step process: first, candidate
   primes are generated using a fast, but memory intensive process.
   These candidate primes are then tested for suitability (a CPU-intensive
   process).
   .Pp
   Generation of primes is performed using the
   .Fl G
   option.
   The desired length of the primes may be specified by the
   .Fl b
   option.
   For example:
   .Pp
   .Dl ssh-keygen -G moduli-2048.candidates -b 2048
   .Pp
   By default, the search for primes begins at a random point in the
   desired length range.
   This may be overridden using the
   .Fl S
   option, which specifies a different start point (in hex).
   .Pp
   Once a set of candidates have been generated, they must be tested for
   suitability.
   This may be performed using the
   .Fl T
   option.
   In this mode
   .Nm
   will read candidates from standard input (or a file specified using the
   .Fl f
   option).
   For example:
   .Pp
   .Dl ssh-keygen -T moduli-2048 -f moduli-2048.candidates
   .Pp
   By default, each candidate will be subjected to 100 primality tests.
   This may be overridden using the
   .Fl a
   option.
   The DH generator value will be chosen automatically for the
   prime under consideration.
   If a specific generator is desired, it may be requested using the
   .Fl W
   option.
   Valid generator values are 2, 3 and 5.
   .Pp
   Screened DH groups may be installed in
   .Pa /etc/moduli .
   It is important that this file contains moduli of a range of bit lengths and
   that both ends of a connection share common moduli.
 .Sh FILES  .Sh FILES
 .Bl -tag -width Ds  .Bl -tag -width Ds
 .It Pa $HOME/.ssh/identity  .It Pa $HOME/.ssh/identity
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 on all machines  on all machines
 where the user wishes to log in using public key authentication.  where the user wishes to log in using public key authentication.
 There is no need to keep the contents of this file secret.  There is no need to keep the contents of this file secret.
   .It Pa /etc/moduli
   Contains Diffie-Hellman groups used for DH-GEX.
   The file format is described in
   .Xr moduli 5 .
 .El  .El
 .Sh AUTHORS  
 OpenSSH is a derivative of the original and free  
 ssh 1.2.12 release by Tatu Ylonen.  
 Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,  
 Theo de Raadt and Dug Song  
 removed many bugs, re-added newer features and  
 created OpenSSH.  
 Markus Friedl contributed the support for SSH  
 protocol versions 1.5 and 2.0.  
 .Sh SEE ALSO  .Sh SEE ALSO
 .Xr ssh 1 ,  .Xr ssh 1 ,
 .Xr ssh-add 1 ,  .Xr ssh-add 1 ,
 .Xr ssh-agent 1 ,  .Xr ssh-agent 1 ,
   .Xr moduli 5 ,
 .Xr sshd 8  .Xr sshd 8
 .Rs  .Rs
 .%A J. Galbraith  .%A J. Galbraith
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 .%D March 2001  .%D March 2001
 .%O work in progress material  .%O work in progress material
 .Re  .Re
   .Sh AUTHORS
   OpenSSH is a derivative of the original and free
   ssh 1.2.12 release by Tatu Ylonen.
   Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
   Theo de Raadt and Dug Song
   removed many bugs, re-added newer features and
   created OpenSSH.
   Markus Friedl contributed the support for SSH
   protocol versions 1.5 and 2.0.
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