xenial (1) encode_keychange.1.gz

Provided by: snmp_5.7.3+dfsg-1ubuntu4.6_amd64 bug

NAME
       encode_keychange - produce the KeyChange string for SNMPv3


SYNOPSIS
       encode_keychange -t md5|sha1 [OPTIONS]


DESCRIPTION
       encode_keychange  produces a KeyChange string using the old and new passphrases as described in Section 5
       of RFC 2274 "User-based Security Model (USM) for version 3 of  the  Simple  Network  Management  Protocol
       (SNMPv3)". -t option is mandatory and specifies the hash transform type to use.

       The  transform  is  used to convert passphrase to master key for a given user (Ku), convert master key to
       the localized key (Kul), and to hash the old Kul with the random bits.

       Passphrases are obtained by examining a number of sources until success (in order listed):

              command line options (see -N and -O options below);

              the file  $HOME/.snmp/passphrase.ek  which  should  only  contain  two  lines  with  old  and  new
              passphrase;

              standard input -or-  user input from the terminal.


OPTIONS
       -E [0x]<engineID> EngineID used for Kul generation.
              <engineID>  is  intepreted  as a hex string when preceded by 0x, otherwise it is treated as a text
              string. If no <engineID> is specified, it is constructed from the first IP address for  the  local
              host.

       -f     Force passphrases to be read from standard input.

       -h     Display the help message.

       -N "<new_passphrase>"
              Passphrase used to generate the new Ku.

       -O "<old_passphrase>"
              Passphrase used to generate the old Ku.

       -P     Turn off the prompt for passphrases when getting data from standard input.

       -v     Be verbose.

       -V     Echo passphrases to terminal.


SEE ALSO
       The localized key method is defined in RFC 2274, Sections 2.6 and A.2, and originally documented in

              U.  Blumenthal,  N. C. Hien, B. Wijnen, "Key Derivation for Network Management Applications", IEEE
              Network Magazine, April/May issue, 1997.