Hello dimax.main,

Thank you for contacting us here on the forums. Yes wolfSSL is set up to be able to use lwIP. In wolfssl/wolfcrypt/settings.h there is a macro flag for using it called "WOLFSSL_LWIP", it's currently around line 70. For some more reading on it there is a previous case where Chris was helping port to an embedded device using lwIP here https://www.wolfssl.com/forums/topic275 … tack.html.

Can you tell us some about the project being worked on?

Regards,
Jacob

Hi dimax.main,

Missed the netcon part in the first post. No we do not have a default mapping to this API that is as easy as defining the WOLFSSL_LWIP macro, porting to the API would be as follows.

For porting to a system without making any changes to wolfSSL code I would recommend using the IO callbacks and defining WOLFSSL_USER_IO. The macro WOLFSSL_USER_IO removes header files and assumptions on IO calls, allowing the user to set their own IO operations. After creating a WOLFSSL_CTX structure in a users application the following functions would be needed to set what IO should be used.

//user application code defining the functions user-io-recv-callback and user-io-send-callback

//user application created ctx with wolfSSL_CTX_new();

wolfSSL_SetIORecv(ctx, user-io-recv-callback);
wolfSSL_SetIOSend(ctx, user-io-send-callback);

wolfSSL at this point is effectively encrypting/decrypting buffers and not worrying about how it is physically being sent or received. An example use of the IO callbacks can be found at https://github.com/wolfSSL/wolfssl-examples in the file tls/server-callback.c.

Regards,
Jacob