Improved curve25519-dup-test.

ChangeLog

+2014-07-14  Niels Möller  <nisse@lysator.liu.se>
+
+	* testsuite/curve25519-dup-test.c (test_main): Add test for 4g.
+	Delete some left-over debug output.
+
 2014-07-11  Niels Möller  <nisse@lysator.liu.se>
 
 	* misc/ecc-formulas.tex: Some ECC notes.

testsuite/curve25519-dup-test.c

@@ -31,7 +31,7 @@ test_main (void)
   mp_limb_t *pe;
   mp_limb_t *pa;
   mp_limb_t *scratch;
-  const struct ecc_ref_point g2 =    
+  const struct ecc_ref_point g2 =
     { /* In Edwards coordinates:
 	 x = 0x1a1c31f8665368131698fecfd54233fcdc638bb46d25cc61d8bc4bcdbfbb4459,
 	 y = 0x2260cdf3092329c21da25ee8c9a21f5697390f51643851560e5f46ae6af8a3c9
@@ -41,6 +41,13 @@ test_main (void)
       "13b57e011700e8ae050a00945d2ba2f3"
       "77659eb28d8d391ebcd70465c72df563"
     };
+  const struct ecc_ref_point g4 =    
+    {
+      "79ce98b7e0689d7de7d1d074a15b315f"
+      "fe1805dfcd5d2a230fee85e4550013ef",
+      "075af5bf4ebdc75c8fe26873427d275d"
+      "73c0fb13da361077a565539f46de1c30"
+    };
 
   g = xalloc_limbs (ecc_size_j (ecc));
   z = xalloc_limbs (ecc_size_j (ecc));
@@ -59,16 +66,14 @@ test_main (void)
   ecc_dup_eh (ecc, pe, z, scratch);
   if (!point_zero_p (ecc, pe))
     die ("dup of zero point failed.\n");
-      
+
   ecc_dup_eh (ecc, pe, g, scratch);
-  gmp_fprintf (stderr, "g2 (edwards):\n"
-	       "x = %Nx\n"
-	       "y = %Nx\n"
-	       "z = %Nx\n",
-	       pe, ecc->size,
-	       pe + ecc->size, ecc->size,
-	       pe + 2*ecc->size, ecc->size);
 
   ecc_eh_to_a (ecc, 0, pa, pe, scratch);
   test_ecc_point (ecc, &g2, pa);
+
+  ecc_dup_eh (ecc, pe, pe, scratch);
+
+  ecc_eh_to_a (ecc, 0, pa, pe, scratch);
+  test_ecc_point (ecc, &g4, pa);
 }