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[doc] update client-secure-class.rst (#3924)

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add limitations of tls connection
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Rotzbua 2017-12-08 08:25:18 +01:00 committed by Develo
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doc/esp8266wifi/client-secure-class.rst
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@ -5,6 +5,29 @@ Client Secure Class
Methods and properties described in this section are specific to ESP8266. They are not covered in `Arduino WiFi library <https://www.arduino.cc/en/Reference/WiFi>`__ documentation. Before they are fully documented please refer to information below.
Supported crypto
~~~~~~~~~~~~~~~~
In the background the library `axtls <http://axtls.sourceforge.net>`_ is used. The library supports only rsa certificates and no new eliptic curve certificates. TLSv1.2 is supported since SDK 2.4.0-rc1.
The following ciphers and digests are supported by `specification <http://axtls.sourceforge.net/specifications.htm>`_:
* Symmetric Ciphers
* AES128-SHA
* AES256-SHA
* AES128-SHA256
* AES256-SHA256
* Asymmetric Ciphers
* RSA 512/1024/2048/4096 bit encryption/decryption.
* RSA signing/verification
* Digests
* SHA1
* MD5
* SHA256/384/512
* HMAC-SHA1
* HMAC-MD5
* HMAC-SHA256
loadCertificate
~~~~~~~~~~~~~~~