AES in nrf51

[nordicbeginner]

hello there i want to use AES in nrf51. i want to encrypt nrf51's advertisement data . and decrypt using android app.

i have some confusions (1) should i use nordic's AES block or not?? (2) should i use some another open source library for AES??

[syntroniks]

infocenter.nordicsemi.com/.../group__nrf__ecb.html

For SDK10. Newer versions have a crypto library. infocenter.nordicsemi.com is your friend

[nordicbeginner]

i have updated my question...