How to write one page in the flash memory? STM32F103CBT6

Hello. I am working on my bootloader. I am using STM32F103CBT6. I need assistance how to write a C function for programing of 1 flash memory page. The task is; C function should receive a pointer to the 1kB buffer with data and the flash page address which is needed to be written. Does anybody has a working solution or could provide some ideas for me? Thanks in advance.

Kind regards,

TC