SNMPKEY(1p)

💖 SNMPKEY 💖

okay bestie, so this is the manual for snmpkey, which lives in the User Contributed Perl Documentation section of your man pages. it's a tiny little Perl utility and honestly? it's giving backstage-pass energy for SNMPv3. let's get into it 🎀

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✨ NAME ✨

snmpkey — create SNMPv3 security keys for the Net::SNMP module 💅

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🌸 USAGE 🌸

so the snmpkey utility generates security keys based on a password and an authoritativeEngineID that you pass on the command line. then you can hand that key to the Net::SNMP module instead of the plain text password when you're creating SNMPv3 objects. iconic, honestly.

snmpkey <authProto> <password> <authEngineID> [<privProto> [<password>]]

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🦋 DESCRIPTION 🦋

okay so the User-based Security Model that SNMPv3 uses defines an algorithm that "localizes" a plain text password to a specific authoritativeEngineID using a one-way hash. the key that falls out of that gets used by the SNMP application instead of the plain text password, and it does that for security reasons. periodt.

the Net::SNMP module lets you give the object constructor either a plain text password or a localized key when you're configuring authentication or privacy. and that's exactly what snmpkey is for — generating the key you'd pass as the -authkey or -privkey named arguments when you send them to the Net::SNMP session() constructor. no cap. 🫶

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👑 REQUIRED ARGUMENTS 👑

the snmpkey utility needs at least three command line arguments. here's the rundown:

1. first argument — tells it which hash algorithm to use when creating the authKey. you can specify either HMAC-MD5-96 or HMAC-SHA-96, by passing the string 'md5' or 'sha' respectively. ⚠️ this choice must match the algorithm you pass to the -authprotocol argument when you create the Net::SNMP object. they have to be besties or it's not gonna work.
2. second argument — the plain text password that's gonna get localized to create the authKey. 💜
3. third argument — the authoritativeEngineID of the remote SNMP engine that's associated with the Net::SNMP argument -hostname. this one goes in as a hexadecimal string that's 10 to 64 characters long, which is 5 to 32 octets, and you can prefix it with an optional "0x". ✨

then the last two arguments are optional, and they decide how the privKey gets generated. lowkey important:

• the fourth argument defaults to a value of 'des', which corresponds to the default privacy protocol defined in the User-based Security Model. the Net::SNMP module also supports CBC-3DES-EDE and CFB128-AES-128 as alternatives to the default protocol CBC-DES — you pick those by specifying the string '3des' or 'aes' respectively. ⚠️ and yeah, this choice must match the protocol passed to the -privprotocol argument when you create the Net::SNMP object. again: matching vibes only.
• the last argument is where you can specify the plain text password that gets localized to create the privKey. and if you just… don't specify it? the authKey password is used instead. convenient fr fr. 🌈

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🎀 AUTHOR 🎀

David M. Town <dtown@cpan.org> — the legend who made this happen 👑

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💜 LICENSE AND COPYRIGHT 💜

Copyright (c) 2001-2009 David M. Town. All rights reserved.

This program is free software; you may redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

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⭐ SEE ALSO ⭐

• Net::SNMP — go read it, iykyk 📖

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and that's the whole page, bestie!! this was documented for perl v5.40.1 and dated 2025-03-01, so if you're reading this on some crusty old perl… vibe check your install 🙈💅 slay, go localize some passwords, and remember: plain text passwords are NOT the moment. keys only. bye!! 🦋✨🎀