I need a Expert Programmer of C/C++ , Encryption/Decryption

Job ID: 32888249

Budget: $200 – $600 USD

Update and Fix a function that uses "AES-256-GCM"

I have a code in C++/C that I need to UPDATE in a function that has not stopped working. the code is small, it has 600 to 800 lines.

the part of the code that is having problems, is in the function of Decryption using " ".

I need a C/C++ and Cryptography Expert
If you have these skills, let me know.