From: Niels Möller <nisse@lysator.liu.se>
Date: Mon, 15 Nov 2021 18:40:58 +0000 (+0100)
Subject: Fix sqrt_ratio test for v = 0 case.
X-Git-Tag: nettle_3.8_release_20220602~65
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=957482d95e735492207e571a515ace95089e48ed;p=thirdparty%2Fnettle.git

Fix sqrt_ratio test for v = 0 case.
---

diff --git a/ChangeLog b/ChangeLog
index e3da5bd2..dfa5e1e1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2021-11-15  Niels Möller  <nisse@lysator.liu.se>
+
+	* testsuite/ecc-sqrt-test.c (test_sqrt_ratio): Fix sqrt_ratio test
+	for v = 0, failure is expected.
+
 2021-11-13  Niels Möller  <nisse@lysator.liu.se>
 
 	* testsuite/testutils.c (get_random_seed): Move function here.
diff --git a/testsuite/ecc-sqrt-test.c b/testsuite/ecc-sqrt-test.c
index 7984ed81..377e1870 100644
--- a/testsuite/ecc-sqrt-test.c
+++ b/testsuite/ecc-sqrt-test.c
@@ -244,6 +244,10 @@ test_sqrt_ratio (gmp_randstate_t rands, const struct ecc_modulo *m)
 	  mpz_limbs_copy (up, u, m->size);
 	  if (!m->sqrt_ratio (m, rp, up, vp, scratch))
 	    {
+	      if (mpz_divisible_p (v, p))
+		/* v = 0 (mod p), sqrt_ratio should fail. */
+		continue;
+
 	      fprintf (stderr, "m->sqrt_ratio returned failure, bit_size = %d\n"
 		       "u = 0x",
 		       m->bit_size);