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docs: improve sc docu

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Matthias Ringwald 2016-06-10 13:21:40 +02:00
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commit ac85f41222
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doc/manual/docs/protocols.md
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@ -767,14 +767,13 @@ To fix this, the Bluetooth Core V4.2 specification introduced the new
BTstack supports both pairing methods. To enable the more secure LE Secure Connections method, BTstack supports both pairing methods. To enable the more secure LE Secure Connections method,
*ENABLE_LE_SECURE_CONNECTIONS* needs to be defined in *btstack_config.h*. *ENABLE_LE_SECURE_CONNECTIONS* needs to be defined in *btstack_config.h*.
LE Secure Connections are based on Elliptic Curve Diffie-Hellman (ECDH) keypairs. LE Secure Connections are based on Elliptic Curve Diffie-Hellman (ECDH) algorithm for the key exchange.
On start, a new public/private key pair is generated. During pairing, the On start, a new public/private key pair is generated. During pairing, the
Long Term Key (LTK) is generated based on the local keypair and the remote public key. Long Term Key (LTK) is generated based on the local keypair and the remote public key.
To facilitate the creation of such a keypairs and the calculation of the LTK, To facilitate the creation of such a keypairs and the calculation of the LTK,
the Bluetooth Core V4.2 specification introduced appropriate commands for the Bluetooth controller. the Bluetooth Core V4.2 specification introduced appropriate commands for the Bluetooth controller.
As an alternative for controller that don't provide these primitives, BTstack implements As an alternative for controllers that don't provide these primitives, BTstack provides the relevant crytographic functions in software via the Apache 2.0 licensed [mbed TLS library](https://tls.mbed.org).
the crytographic functions in software with the help of the Apache 2.0 Licensed [mbed TLS library](https://tls.mbed.org).
There are two details to be aware about using LE Secure Connections: There are two details to be aware about using LE Secure Connections: