Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl3/STM32WL33/AES/AES_SR#0x0
AES_SR register
CCF: Computation complete flag
RDERR: Read error flag
WRERR: Write error flag
BUSY: Busy flag
https://github.com/modm-io/cmsis-svd-stm32