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I've some Python pytests that call (indirectly)

key = joserfc.jwk.RSAKey.import_key(string).

This is pretty slow so I'm hoping there is a way I can save the (string,key) combination in a cache, and then use that to stub the call. I've tried saving key using pickle, but I get TypeError: cannot pickle 'cryptography.hazmat.bindings._rust.openssl.rsa.RSAPrivateKey' object

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  • You can't use pickle, but you can use the serialization methods of the cryptography package. See cryptography.io/en/stable/hazmat/primitives/asymmetric/rsa/… and cryptography.io/en/stable/hazmat/primitives/asymmetric/rsa/…. Commented Dec 31, 2024 at 20:47
  • Thanks. I've now looked into that a bit. I can indeed get the public/private bytes from an RSAPublicKey and an RSAPrivateKey and serialize the bytes. The problem is that key (as returned from the import_key method) is neither an RSAPublicKey nor an RSAPrivateKey. So it seems I still need to call import_key (so the following statements that use key are unaffected by the stubbing). Commented Jan 1 at 11:12
  • I'll try and look at it again in more detail. Commented Jan 2 at 0:00
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