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encode_keychange(1)			     Net-SNMP			      encode_keychange(1)

       encode_keychange - produce the KeyChange string for SNMPv3

       encode_keychange -t md5|sha1 [OPTIONS]

       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.

       -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.

       The localized key method is defined in RFC 2274, Sections 2.6 and A.2, and originally doc-
       umented in

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

V5.7.2					   16 Nov 2006			      encode_keychange(1)
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