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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
#
from pysnmp.proto.secmod.rfc3826.priv import aes
from pysnmp.proto.secmod.rfc3414.auth import hmacmd5, hmacsha
from pysnmp.proto.secmod.rfc3414 import localkey
from pysnmp.proto import error
from math import ceil
try:
from hashlib import md5, sha1
except ImportError:
import md5
import sha
md5 = md5.new
sha1 = sha.new
class AbstractAes(aes.Aes):
serviceID = ()
keySize = 0
# 3.1.2.1
def localizeKey(self, authProtocol, privKey, snmpEngineID):
if authProtocol == hmacmd5.HmacMd5.serviceID:
localPrivKey = localkey.localizeKeyMD5(privKey, snmpEngineID)
for count in range(1, int(ceil(self.keySize * 1.0 / len(localPrivKey)))):
# noinspection PyDeprecation,PyCallingNonCallable
localPrivKey += md5(localPrivKey).digest()
elif authProtocol == hmacsha.HmacSha.serviceID:
localPrivKey = localkey.localizeKeySHA(privKey, snmpEngineID)
# RFC mentions this algo generates 480bit key, but only up to 256 bits are used
for count in range(1, int(ceil(self.keySize * 1.0 / len(localPrivKey)))):
localPrivKey += sha1(localPrivKey).digest()
else:
raise error.ProtocolError(
'Unknown auth protocol %s' % (authProtocol,)
)
return localPrivKey[:self.keySize]
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