How does the STM32 bxCAN HAL module calculate the transmitted and check the received 15-bit CRC field? What is the generating polynomial?

[HWood]

I am trying to connect with an Intel Cyclone IV FPGA. I have looked in the reference manual for the STM, however, there is no information about the calculation of CRC 15-bit frame.

[Tesla DeLorean]

https://www.can-cia.org/can-knowledge/can/crc/