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# Convert plaintext passphrase into a localized key
import md5, sha
# RFC3414: A.2.1
def hashPassphraseMD5(passphrase):
md = md5.new()
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 = count + 1
return md.digest()
def localizeKeyMD5(passKey, snmpEngineId):
return md5.new('%s%s%s' % (passKey, str(snmpEngineId), passKey)).digest()
def passwordToKeyMD5(passphrase, snmpEngineId):
return localizeKeyMD5(hashPassphraseMD5(passphrase), snmpEngineId)
# RFC3414: A.2.2
def hashPassphraseSHA(passphrase):
md = sha.new()
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 = count + 1
return md.digest()
def localizeKeySHA(passKey, snmpEngineId):
return sha.new('%s%s%s' % (passKey, str(snmpEngineId), passKey)).digest()
def passwordToKeySHA(passphrase, snmpEngineId):
return localizeKeySHA(hashPassphraseSHA(passphrase), snmpEngineId)
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