Creates keys pair and stores in the wallet.

    :param wallet_handle: Wallet handle (created by open_wallet).
    :param key_json: Key information as json. Example:
        {
	        "seed": string, (optional) Seed that allows deterministic key creation (if not set random one will be created).
	                                   Can be UTF-8, base64 or hex string.
            "crypto_type": string, // Optional (if not set then ed25519 curve is used);
                    Currently only 'ed25519' value is supported for this field.
        }
    :return: verkey: Ver key of generated key pair, also used as key identifier

async def create_key(wallet_handle: int,
                     key_json: str) -> str:
    """
    Creates keys pair and stores in the wallet.

    :param wallet_handle: Wallet handle (created by open_wallet).
    :param key_json: Key information as json. Example:
        {
	        "seed": string, (optional) Seed that allows deterministic key creation (if not set random one will be created).
	                                   Can be UTF-8, base64 or hex string.
            "crypto_type": string, // Optional (if not set then ed25519 curve is used);
                    Currently only 'ed25519' value is supported for this field.
        }
    :return: verkey: Ver key of generated key pair, also used as key identifier
    """

    logger = logging.getLogger(__name__)
    logger.debug("create_key: >>> wallet_handle: %r, key_json: %r",
                 wallet_handle,
                 key_json)

    if not hasattr(create_key, "cb"):
        logger.debug("create_key: Creating callback")
        create_key.cb = create_cb(CFUNCTYPE(None, c_int32, c_int32, c_char_p))

    c_wallet_handle = c_int32(wallet_handle)
    c_key_json = c_char_p(key_json.encode('utf-8'))

    verkey = await do_call('indy_create_key',
                           c_wallet_handle,
                           c_key_json,
                           create_key.cb)

    res = verkey.decode()

    logger.debug("create_key: <<< res: %r", res)
    return res