encode_keychange(1) [centos man page]
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 preceded by 0x, otherwise it is treated as a text string. If no <engineID> is speci- fied, 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. V5.7.2 16 Nov 2006 encode_keychange(1)
Check Out this Related Man Page
Authen::Passphrase::MySQL41(3pm) User Contributed Perl Documentation Authen::Passphrase::MySQL41(3pm) NAME
Authen::Passphrase::MySQL41 - passphrases using the MySQL v4.1 algorithm SYNOPSIS
use Authen::Passphrase::MySQL41; $ppr = Authen::Passphrase::MySQL41->new( hash_hex => "9CD12C48C4C5DD62914B". "3FABB93131746E9E9115"); $ppr = Authen::Passphrase::MySQL41->new( passphrase => "passphrase"); $hash = $ppr->hash; $hash_hex = $ppr->hash_hex; if($ppr->match($passphrase)) { ... DESCRIPTION
An object of this class encapsulates a passphrase hashed using the algorithm used by MySQL from version 4.1. This is a subclass of Authen::Passphrase, and this document assumes that the reader is familiar with the documentation for that class. The MySQL v4.1 hash scheme is based on the SHA-1 digest algorithm. The passphrase is first hashed using SHA-1, then the output of that stage is hashed using SHA-1 again. The final hash is the output of the second SHA-1. No salt is used. In MySQL the hash is represented as a "*" followed by 40 uppercase hexadecimal digits. The lack of salt is a weakness in this scheme. Salted SHA-1 is a better scheme; see Authen::Passphrase::SaltedDigest. CONSTRUCTOR
Authen::Passphrase::MySQL41->new(ATTR => VALUE, ...) Generates a new passphrase recogniser object using the MySQL v4.1 algorithm. The following attributes may be given: hash The hash, as a string of 20 bytes. hash_hex The hash, as a string of 40 hexadecimal digits. passphrase A passphrase that will be accepted. Either the hash or the passphrase must be given. METHODS
$ppr->hash Returns the hash value, as a string of 20 bytes. $ppr->hash_hex Returns the hash value, as a string of 40 uppercase hexadecimal digits. $ppr->match(PASSPHRASE) This method is part of the standard Authen::Passphrase interface. SEE ALSO
Authen::Passphrase, Digest::SHA AUTHOR
Andrew Main (Zefram) <zefram@fysh.org> COPYRIGHT
Copyright (C) 2006, 2007, 2009, 2010, 2012 Andrew Main (Zefram) <zefram@fysh.org> LICENSE
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-02-07 Authen::Passphrase::MySQL41(3pm)