How can I encode filehash to String?

the byes is : {-117, 46, 108, 39, 74, -96, -99, -52, 7, -112, -35, 87, -106, 91, -68, 103, 25, -34, -109, 33}

the file SHA1 is:2e2560297911f35b22c2e63ad8d4bc143ed3065b

How can I get the SHA1 above through the bytes array?