From 1ee4f78484654f244b792d02de8a59790eaa8d57 Mon Sep 17 00:00:00 2001
From: tb <>
Date: Thu, 1 Dec 2022 20:50:10 +0000
Subject: Flatten structure of libcrypto/bn tests

The bn tests were distributed into three subdirectories rather randomly.
It's cleaner and easier to maintain if all this is in a single directory.
Use consistent names for the .c files, unify handling of the tests with
the exception of bn_test, which is special.

Discussed with jsing
---
 src/regress/lib/libcrypto/bn/bn_mod_sqrt.c | 129 +++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 src/regress/lib/libcrypto/bn/bn_mod_sqrt.c

(limited to 'src/regress/lib/libcrypto/bn/bn_mod_sqrt.c')

diff --git a/src/regress/lib/libcrypto/bn/bn_mod_sqrt.c b/src/regress/lib/libcrypto/bn/bn_mod_sqrt.c
new file mode 100644
index 0000000000..e193755b74
--- /dev/null
+++ b/src/regress/lib/libcrypto/bn/bn_mod_sqrt.c
@@ -0,0 +1,129 @@
+/*	$OpenBSD: bn_mod_sqrt.c,v 1.1 2022/12/01 20:50:10 tb Exp $ */
+/*
+ * Copyright (c) 2022 Theo Buehler <tb@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <openssl/bn.h>
+
+/* Test that sqrt * sqrt = A (mod p) where p is a prime */
+struct mod_sqrt_test {
+	const char *sqrt;
+	const char *a;
+	const char *p;
+	int bn_mod_sqrt_fails;
+} mod_sqrt_test_data[] = {
+	{
+		.sqrt = "1",
+		.a = "1",
+		.p = "2",
+		.bn_mod_sqrt_fails = 0,
+	},
+	{
+		.sqrt = "-1",
+		.a = "20a7ee",
+		.p = "460201", /* 460201 == 4D5 * E7D */
+		.bn_mod_sqrt_fails = 1,
+	},
+	{
+		.sqrt = "-1",
+		.a = "65bebdb00a96fc814ec44b81f98b59fba3c30203928fa521"
+		     "4c51e0a97091645280c947b005847f239758482b9bfc45b0"
+		     "66fde340d1fe32fc9c1bf02e1b2d0ed",
+		.p = "9df9d6cc20b8540411af4e5357ef2b0353cb1f2ab5ffc3e2"
+		     "46b41c32f71e951f",
+		.bn_mod_sqrt_fails = 1,
+	},
+};
+
+const size_t N_TESTS = sizeof(mod_sqrt_test_data) / sizeof(*mod_sqrt_test_data);
+
+int mod_sqrt_test(struct mod_sqrt_test *test);
+
+int
+mod_sqrt_test(struct mod_sqrt_test *test)
+{
+	BN_CTX *ctx = NULL;
+	BIGNUM *a = NULL, *p = NULL, *want = NULL, *got = NULL, *diff = NULL;
+	int failed = 1;
+
+	if ((ctx = BN_CTX_new()) == NULL) {
+		fprintf(stderr, "BN_CTX_new failed\n");
+		goto out;
+	}
+
+	if (!BN_hex2bn(&a, test->a)) {
+		fprintf(stderr, "BN_hex2bn(a) failed\n");
+		goto out;
+	}
+	if (!BN_hex2bn(&p, test->p)) {
+		fprintf(stderr, "BN_hex2bn(p) failed\n");
+		goto out;
+	}
+	if (!BN_hex2bn(&want, test->sqrt)) {
+		fprintf(stderr, "BN_hex2bn(want) failed\n");
+		goto out;
+	}
+
+	if (((got = BN_mod_sqrt(NULL, a, p, ctx)) == NULL) !=
+	   test->bn_mod_sqrt_fails) {
+		fprintf(stderr, "BN_mod_sqrt %s unexpectedly\n",
+		    test->bn_mod_sqrt_fails ? "succeeded" : "failed");
+		goto out;
+	}
+
+	if (test->bn_mod_sqrt_fails) {
+		failed = 0;
+		goto out;
+	}
+
+	if ((diff = BN_new()) == NULL) {
+		fprintf(stderr, "diff = BN_new() failed\n");
+		goto out;
+	}
+
+	if (!BN_mod_sub(diff, want, got, p, ctx)) {
+		fprintf(stderr, "BN_mod_sub failed\n");
+		goto out;
+	}
+
+	if (!BN_is_zero(diff)) {
+		fprintf(stderr, "want != got\n");
+		goto out;
+	}
+
+	failed = 0;
+
+ out:
+	BN_CTX_free(ctx);
+	BN_free(a);
+	BN_free(p);
+	BN_free(want);
+	BN_free(got);
+	BN_free(diff);
+
+	return failed;
+}
+
+int
+main(void)
+{
+	size_t i;
+	int failed = 0;
+
+	for (i = 0; i < N_TESTS; i++)
+		failed |= mod_sqrt_test(&mod_sqrt_test_data[i]);
+
+	return failed;
+}
-- 
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