> ciphertext = pkey.public_key().encrypt(b"asdasd", padding.PKCS1v15()) pkey = serialization.load_pem_private_key(key_file.read(), password=None, backend=default_backend()) To decrypt the signature you can use a public key (or the public part of a private key). Also, if you control the full stack - from encryption to decryption - stop doing it this way. at 9:14 If the source really has encrypted with the private key, then they've effectively signed the data. You should be sure you understand what's going with these operations before you rely on the code to provide any kind of security.
Before you do, note that it's very easy to shoot yourself in the foot with the hazmat layer and the cryptography team won't apologize if you do. You can do this with the cryptography library's hazmat layer (note that cryptography is now the back-end library used by pyOpenSSL while pyOpenSSL is convenient for some uses, cryptography provides a much more complete OpenSSL binding as well as useful higher-level (safer, better) cryptographic primitives and bindings to other cryptographic libraries as well).
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