:orphan:

.. title:: BT_TINYCRYPT_ECC

.. option:: CONFIG_BT_TINYCRYPT_ECC

*Emulate ECDH in the Host using TinyCrypt library*

Type: ``bool``

Help
====

If this option is set TinyCrypt library is used for emulating the
ECDH HCI commands and events needed by e.g. LE Secure Connections.
In builds including the BLE Host, if not set the controller crypto is
used for ECDH and if the controller doesn't support the required HCI
commands the LE Secure Connections support will be disabled.
In builds including the HCI Raw interface and the BLE Controller, this
option injects support for the 2 HCI commands required for LE Secure
Connections so that Hosts can make use of those. The option defaults
to enabled for a combined build with Zephyr's own controller, since it
does not have any special ECC support itself (at least not currently).

Direct dependencies
===================

\ :option:`BT_ECC <CONFIG_BT_ECC>` && (\ :option:`BT_HCI_RAW <CONFIG_BT_HCI_RAW>` || \ :option:`BT_HCI_HOST <CONFIG_BT_HCI_HOST>`) && \ :option:`BT_HCI <CONFIG_BT_HCI>` && \ :option:`BT <CONFIG_BT>`

*(Includes any dependencies from ifs and menus.)*

Default
=======

- y if \ :option:`BT_CTLR <CONFIG_BT_CTLR>` && !\ :option:`BT_CTLR_ECDH <CONFIG_BT_CTLR_ECDH>`

Symbols selected by this symbol
===============================

- \ :option:`TINYCRYPT <CONFIG_TINYCRYPT>`
- \ :option:`TINYCRYPT_ECC_DH <CONFIG_TINYCRYPT_ECC_DH>`

Kconfig definition
==================

.. highlight:: kconfig

At ``subsys/bluetooth/host/Kconfig:626``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:34`` → ``subsys/Kconfig:9`` → ``subsys/bluetooth/Kconfig:239``

Menu path: (Top) → Sub Systems and OS Services → Bluetooth → Enable ECDH key generation support

.. parsed-literal::

    config BT_TINYCRYPT_ECC
    	bool "Emulate ECDH in the Host using TinyCrypt library"
    	default y if \ :option:`BT_CTLR <CONFIG_BT_CTLR>` && !\ :option:`BT_CTLR_ECDH <CONFIG_BT_CTLR_ECDH>`
    	select \ :option:`TINYCRYPT <CONFIG_TINYCRYPT>`
    	select \ :option:`TINYCRYPT_ECC_DH <CONFIG_TINYCRYPT_ECC_DH>`
    	depends on \ :option:`BT_ECC <CONFIG_BT_ECC>` && (\ :option:`BT_HCI_RAW <CONFIG_BT_HCI_RAW>` || \ :option:`BT_HCI_HOST <CONFIG_BT_HCI_HOST>`) && \ :option:`BT_HCI <CONFIG_BT_HCI>` && \ :option:`BT <CONFIG_BT>`
    	help
    	  If this option is set TinyCrypt library is used for emulating the
    	  ECDH HCI commands and events needed by e.g. LE Secure Connections.
    	  In builds including the BLE Host, if not set the controller crypto is
    	  used for ECDH and if the controller doesn't support the required HCI
    	  commands the LE Secure Connections support will be disabled.
    	  In builds including the HCI Raw interface and the BLE Controller, this
    	  option injects support for the 2 HCI commands required for LE Secure
    	  Connections so that Hosts can make use of those. The option defaults
    	  to enabled for a combined build with Zephyr's own controller, since it
    	  does not have any special ECC support itself (at least not currently).

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*