Square root of a value defined in a finite field?

Question

I am trying to find the right way to compute the square root of a number defined in a finite field. For example,

<< FiniteFields`
In[18]:= Sqrt[GF[17][{8}]]
Out[18]= Sqrt[Subscript[{8}, 17]]

Results in an incorrect answer. The correct answer is 5.

Answer 1

PowerMod[n, 1/2, f]

e.g.

PowerMod[8, 1/2, 17]

(* 5 *)