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ssh-keyconverter


     ssh-keyconvert [-a] [-o output_file] authorization_file ...


DESCRIPTION

     ssh-keyconvert converts RSA public and private keys used for public key
     based user authentication with protocol version 1 to the format used with
     protocol version 2.

     When using RSA user authentication with SSH protocol version 1, the
     client uses the private key from $HOME/.ssh/identity to provide its iden­
     tity to the server. The server grants or denies access based on whether
     the public part of this key is listed in $HOME/.ssh/authorized_keys.

     SSH protocol version 2 supports both DSA and RSA keys, but the way RSA
     keys are stored are differently. On the client, the default file name is
     .ssh/id_rsa rather than .ssh/identity, and the file's format is different
     as well. On the server, the public porting of the key can still be stored
     in .ssh/authorized_keys, but the key notation has changed as well.
     Therefore, when switching from protocol version 1 to version 2, you
     either have to create a new identity key using ssh-keygen(1) and add that
     key to the server's authorized_keys file, or you need to convert your
     keys using ssh-keyconvert.

     By default, ssh-keyconvert will try to guess the type of file that is to
     be converted.  If it fails to guess correctly, you can tell if what type
     of conversion to perform by specifying the -k option to convert the pri­
     vate key, or the -a option to convert an authorisation file.

     When converting your private keys stored in .ssh/identity, ssh-keyconvert
     will read the private key, prompting you for the pass phrase if the key
     is protected by a pass phrase. If the -o option is given, it will write
     the private key to the specified file, using version 2 syntax. If the key
     was protected by a pass phrase, it will use the same pass phrase to pro­
     tect the new file.  It will also write the public portion of the key to a
     second file, using the specified file name with ``.pub'' appended.  If
     the -o option was not given, private and public key will be written to
     id_rsa and id_rsa.pub, respectively, relative to the directory of the
     input key file.

     If the destination file already exists, ssh-keyconvert will prompt the
     user for confirmation before overwriting the file, unless the -f option
     is given.

     When converting your authorized_keys file, ssh-keyconvert will ignore any
     keys in SSH version 2 format. Any public keys in version 1 format will be
     converted and appended to the output file using the new syntax. If the -o
     option is given, keys are appended to the specified file. If it is not
     given, ssh-keyconvert will append all keys to the input file.

     Note that ssh-keyconvert does not check for duplicate keys, so if you run
     it on .ssh/authorized_keys more several times, the converted keys will
     show up several times.


     -f      When converting a key file, and the output file already exists,
             ssh-keyconvert will ask the user whether to overwrite the file.
             Using this option forces overwriting.


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 cre­
     ated OpenSSH.  ssh-keyconvert was contributed by Olaf Kirch.


SEE ALSO

     ssh(1), ssh-add(1), ssh-agent(1), sshd(8)

     J. Galbraith and R. Thayer, SECSH Public Key File Format, draft-ietf-
     secsh-publickeyfile-01.txt, March 2001, work in progress material.

BSD                            February 2, 2002                            BSD
  
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