INNER CODE UNIT · Python

mse

polhenarejos/pico-hsm · tools/pico-hsm-tool.py:292

    def mse(self):
        sk = ec.generate_private_key(ec.SECP256R1())
        pn = sk.public_key().public_numbers()
        self.__pb = sk.public_key().public_bytes(Encoding.X962, PublicFormat.UncompressedPoint)

        ret = self.picohsm.send(cla=0x80, command=0x64, p1=0x3A, p2=0x01, data=list(self.__pb))

        pk = ec.EllipticCurvePublicKey.from_encoded_point(ec.SECP256R1(), bytes(ret))
        shared_key = sk.exchange(ec.ECDH(), pk)

        xkdf = HKDF(
            algorithm=hashes.SHA256(),
            length=12+32,
            salt=None,
            info=self.__pb
        )
        kdf_out = xkdf.derive(shared_key)
        self.__key_enc = kdf_out[12:]

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