Use function pointer rather than calling ecc_add_eh directly.

* eddsa-verify.c (_eddsa_verify): Use function pointer rather than
calling ecc_add_eh directly. Preparation for eddsa over curve448.

ChangeLog

+2019-12-18  Niels Möller  <nisse@lysator.liu.se>
+
+	* eddsa-verify.c (_eddsa_verify): Use function pointer rather than
+	calling ecc_add_eh directly. Preparation for eddsa over curve448.
+
 2019-12-17  Niels Möller  <nisse@lysator.liu.se>
 
 	* examples/ecc-benchmark.c (bench_dup_hh): Rename, and use

eddsa-verify.c

@@ -114,7 +114,7 @@ _eddsa_verify (const struct ecc_curve *ecc,
 
   /* Compute h A + R - s G, which should be the neutral point */
   ecc->mul (ecc, P, hp, A, scratch_out);
-  ecc_add_eh (ecc, P, P, R, scratch_out);
+  ecc->add_hh (ecc, P, P, R, scratch_out);
   /* Move out of the way. */
   mpn_copyi (hp, sp, ecc->q.size);
   ecc->mul_g (ecc, S, hp, scratch_out);