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""""""
from pysnmp.crypto import backend, CRYPTODOME, CRYPTOGRPAHY, generic_decrypt, generic_encrypt, raise_backend_error
if backend == CRYPTOGRPAHY:
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.ciphers import algorithms, Cipher, modes
elif backend == CRYPTODOME:
from Cryptodome.Cipher import AES
def _cryptodome_cipher(key, iv):
""""""
return AES.new(key, AES.MODE_CFB, iv, segment_size=128)
def _cryptography_cipher(key, iv):
""""""
return Cipher(
algorithm=algorithms.AES(key),
mode=modes.CFB(iv),
backend=default_backend()
)
_CIPHER_FACTORY_MAP = {
CRYPTOGRPAHY: _cryptography_cipher,
CRYPTODOME: _cryptodome_cipher,
None: raise_backend_error
}
def encrypt(plaintext, key, iv):
""""""
return generic_encrypt(_CIPHER_FACTORY_MAP, plaintext, key, iv)
def decrypt(plaintext, key, iv):
""""""
return generic_decrypt(_CIPHER_FACTORY_MAP, plaintext, key, iv)
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