RSA import fail

[jschlyter]

With the latest cryptography (3.1), something is rotten in the state of RSA. Previous version of cryptography (3.0) works like a charm.

from cryptojwt.key_bundle import KeyBundle
from cryptojwt.jwk.rsa import new_rsa_key, RSAKey
from cryptojwt.jwk.jwk import key_from_jwk_dict

key = new_rsa_key(key_size=2048)
jwk_dict = key.serialize(private=True)

k1 = key_from_jwk_dict(jwk_dict)
print(k1)

k2 = RSAKey(**jwk_dict)
print(k2)

key_from_jwk_dict works but, RSAKey does not:

ValueError: ('Invalid private key', [_OpenSSLErrorWithText(code=67764350, lib=4, func=160, reason=126, reason_text=b'error:040A007E:rsa routines:RSA_check_key_ex:iqmp not inverse of q')])

[jschlyter]

Shouldn't do_keys use key_from_jwk_dict? Seems strange to have different logic for importing into a KeyBundle than importing to a JWK.

[jschlyter]

Problem is that RSAKey gets more key parameters when used directly compared to when used in key_from_jwk_dict. Cryptography 3.1 probably does more testing upon constructing keys and fails.

[angelakis]

Hadn't seen this when I started writing my issue but the problem is in the rsa_construct_private method (check #62). I think we can use latest cryptography version after fixing this.