crypto.py 文件源码

def __encrypt_with_rsa(self, content, recipient_pk):
        """ Encrypt content with RSAES-OAEP scheme

        @developer: vsmysle

        This method handles an encryption of a *single* RSA block with a
        specified above scheme. It does not handle splitting of a header into
        several blocks. It has to be done by other method that would use this
        one only for single block encryption purpose.

        TODO: what is a maximum size of a content that can be padded and
        encrypted given a particular size of RSA key?

        :param content:         bytes content to encrypt (probably a part of
                                ASN.1 DER-encoded MPHeader block)
        :param recipient_pk:    instance of cryptography.hazmat.primitives.rsa
                                .RSAPublicKey to use for a content encryption

        :return: string encryption of an input content

        """

        # TODO: add exceptions
        self.logger.debug("rsa encryption")

        ciphertext = recipient_pk.encrypt(
            content, asym_padding.OAEP(
                mgf=asym_padding.MGF1(algorithm=SHA1()),
                algorithm=SHA1(),
                label=None
            )
        )
        self.logger.info("encrypted")
        return ciphertext