ciphering services not available error on pysnmp v3 get using pysnmp7 - pycryptodome and cryptography not installed

Question

$# pip show pysnmp
Name: pysnmp
Version: 7.1.16


$:/etc/zabbix# pip show cryptography
Name: cryptography
Version: 42.0.5

$# pip show pycryptodome
Name: pycryptodome
Version: 3.21.0

import asyncio
from pysnmp.hlapi.v3arch.asyncio import *


async def main():
    iterator = get_cmd(
        SnmpEngine(),
        UsmUserData(
            'admin',
            authKey='privateprivate',
            privKey='privateprivate',
            authProtocol=usmHMACMD5AuthProtocol,
            privProtocol=usmDESPrivProtocol
        ),
        await UdpTransportTarget.create(("10.20.7.108", 161)),
        ContextData(),
        ObjectType(ObjectIdentity('1.3.6.1.4.1.248.11.22.1.8.10.2.0')),
    )
    errorIndication, errorStatus, errorIndex, varBinds = await iterator
    print(f"Error Indication: {errorIndication}, Error Status: {errorStatus}, Error Index: {errorIndex}")
    print(f"VarBinds: {varBinds}")
    
if __name__ == '__main__':
    try:
        asyncio.run(main())
    except RuntimeError:
        pass # to avoid RuntimeError: Event loop is closed
    print('out')

输出为

Error Indication: Ciphering services not available, Error Status: 0, Error Index: 0
VarBinds: ()
out

您正在使用旧版本

cryptography

。如果您升级到43.0.x版本，则情况应该很好，

https：//github.com/lextudio/pysnmp/blob/v7.1.16/pyproject.toml#l53

Answer 1