Takashi Kajinami 4d3b5a52ae Fix compatibility with cryptography >= 42.0.0
The load_der_public_key method and the load_pem_private_key method were
removed from Backend class in cryptography 42.0.0[1].

Closes #713

[1] 41daf2d86d
2024-03-29 13:48:09 -04:00
..
2016-01-29 13:29:36 -05:00
2017-08-25 10:31:11 -04:00