Get a public key

A valid public key in the OEF contains only Base58 characters, which consist of alphanumeric characters, excluding the following characters: 0 (zero), O (capital o), I (capital i) and l (lower case L).

Generate a public key for your Agent with the crypto.py script which uses the Python cryptography library.

Simply instantiate a Crypto object and call the public_key() function.

@property
def public_key(self) -> str:
    """
    Returns a 219 character public key in base58 format
    """
    return self._public_key_b58

The library generates a private key and the function returns a Base58 public key string.

Calling public_key() again returns the same public key.

In the same script, there are data verification and signing functions.

The sign_data() function takes a serialized byte stream of data, signs it, and returns signed data as an immutable sequence of bytes.

def sign_data(self, data: bytes) -> bytes:
    """
    Sign data with your own private key.
    :param data: the data to sign
    :return: the signature
    """
    digest = self._hash_data(data)
    signature = self._private_key.sign(digest, ec.ECDSA(utils.Prehashed(self._chosen_hash)))
    return signature

The is_confirmed_integrity() function verifies signed data against a signature and a public key.

def is_confirmed_integrity(self, data: bytes, signature: bytes, signer_pbk: str) -> bool:
    """
    Confirrms the integrity of the data with respect to its signature.
    :param data: the data to be confirmed
    :param signature: the signature associated with the data
    :param signer_pbk:  the public key of the signer
    :return: bool indicating whether the integrity is confirmed or not
    """
    signer_pbk = self._pbk_to_obj(signer_pbk)
    digest = self._hash_data(data)
    try:
        signer_pbk.verify(signature, digest, ec.ECDSA(utils.Prehashed(self._chosen_hash)))
        return True
    except CryptoError as e:
        logger.exception(str(e))
        return False