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doc: change to micro-ecc

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Matthias Ringwald 2017-04-13 17:13:40 +02:00
parent 3570429f98
commit 1b7466ed29
1 changed files with 2 additions and 5 deletions
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doc/manual/docs/protocols.md
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@ -797,12 +797,9 @@ Long Term Key (LTK) is generated based on the local keypair and the remote publi
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.
As an alternative for controllers that don't provide these primitives, BTstack provides the relevant cryptographic functions in software via the Apache 2.0 licensed [mbed TLS library](https://tls.mbed.org).
As an alternative for controllers that don't provide these primitives, BTstack provides the relevant cryptographic functions in software via the BSD-2-Clause licensed [micro-ecc library](https://github.com/kmackay/micro-ecc/tree/static).
There are two details to be aware about using LE Secure Connections:
- More RAM: It requires an additional 1.5 kB RAM when using mbed TLS instead of hardware support by the Bluetooth controller.
- Peripheral must store LTK: Even an LE Peripheral needs to store the LTK in non-volatile memory.
When using using LE Secure Connections, the Peripheral must store LTK in non-volatile memory.
### Initialization