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encode_keychange(1)		   Net-SNMP		   encode_keychange(1)

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 preceeded 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 stan‐
	      dard 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  Net‐
	      work  Management Applications", IEEE Network Magazine, April/May
	      issue, 1997.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌────────────────────┬─────────────────────────────────┐
       │  ATTRIBUTE TYPE    │	      ATTRIBUTE VALUE	      │
       ├────────────────────┼─────────────────────────────────┤
       │Availability	    │ system/management/snmp/net-snmp │
       ├────────────────────┼─────────────────────────────────┤
       │Interface Stability │ Volatile			      │
       └────────────────────┴─────────────────────────────────┘
NOTES
       Source for net-snmp is available on http://opensolaris.org.

4.2 Berkeley Distribution	  16 Nov 2006		   encode_keychange(1)
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