esp_encrypted_img: Arduino IDF component error: invalid conversion from 'esp_decrypt_handle_t' {aka 'void*'} to 'void**' (IEC-55)

[dzungpv]

Answers checklist.

• [X] I have read the documentation of the component in question and the issue is not addressed there.
• [X] I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

I use esp_encrypted_img in a IDF project with arduino-esp32 component, code in C++. When I try the sample https://github.com/espressif/esp-idf/tree/master/examples/system/ota/pre_encrypted_ota with IDF 4.4.7 and arduino-esp32 as component, the error appear, I try to all the cast in C++ and also mark the function with extern "C" but it could not compile, show the error:

error: invalid conversion from 'esp_decrypt_handle_t' {aka 'void*'} to 'void**' [-fpermissive]
     ctx = esp_encrypted_img_decrypt_start(&cfg);

Cast with C++ : const_cast<esp_decrypt_cfg_t*>(&cfg) does not work too.

[dzungpv]

I solve myself, change ctx to C++ style and it work.