/usr/lib/python3/dist-packages/pysnmp/proto/secmod/rfc3414/localkey.py is in python3-pysnmp4 4.3.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of pysnmp software.
#
# Copyright (c) 2005-2016, Ilya Etingof <ilya@glas.net>
# License: http://pysnmp.sf.net/license.html
#
try:
from hashlib import md5, sha1
except ImportError:
import md5, sha
md5 = md5.new
sha1 = sha.new
from pyasn1.type import univ
# RFC3414: A.2.1
def hashPassphraseMD5(passphrase):
passphrase = univ.OctetString(passphrase).asOctets()
md = md5()
ringBuffer = passphrase * (passphrase and (64//len(passphrase)+1) or 1)
ringBufferLen = len(ringBuffer)
count = 0
mark = 0
while count < 16384:
e = mark + 64
if e < ringBufferLen:
md.update(ringBuffer[mark:e])
mark = e
else:
md.update(
ringBuffer[mark:ringBufferLen] + ringBuffer[0:e-ringBufferLen]
)
mark = e-ringBufferLen
count += 1
return md.digest()
def localizeKeyMD5(passKey, snmpEngineId):
passKey = univ.OctetString(passKey).asOctets()
return md5(passKey + snmpEngineId.asOctets()+ passKey).digest()
def passwordToKeyMD5(passphrase, snmpEngineId):
return localizeKeyMD5(hashPassphraseMD5(passphrase), snmpEngineId)
# RFC3414: A.2.2
def hashPassphraseSHA(passphrase):
passphrase = univ.OctetString(passphrase).asOctets()
md = sha1()
ringBuffer = passphrase * (64//len(passphrase)+1)
ringBufferLen = len(ringBuffer)
count = 0
mark = 0
while count < 16384:
e = mark + 64
if e < ringBufferLen:
md.update(ringBuffer[mark:e])
mark = e
else:
md.update(
ringBuffer[mark:ringBufferLen] + ringBuffer[0:e-ringBufferLen]
)
mark = e-ringBufferLen
count += 1
return md.digest()
def localizeKeySHA(passKey, snmpEngineId):
passKey = univ.OctetString(passKey).asOctets()
return sha1(passKey + snmpEngineId.asOctets()+ passKey).digest()
def passwordToKeySHA(passphrase, snmpEngineId):
return localizeKeySHA(hashPassphraseSHA(passphrase), snmpEngineId)
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