Add ecstress test

Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3720)

1 files changed, 161 insertions, 0 deletions

diff --git a/test/ecstresstest.c b/test/ecstresstest.c
new file mode 100644
index 0000000000..5ea8f8477e
--- /dev/null
+++ b/test/ecstresstest.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL licenses, (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * https://www.openssl.org/source/license.html
+ * or in the file LICENSE in the source distribution.
+ */
+
+#include "e_os.h"
+#include "testutil.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#define NUM_REPEATS "1000000"
+
+static int64_t num_repeats;
+static int print_mode = 0;
+
+#ifndef OPENSSL_NO_EC
+# include <openssl/ec.h>
+# include <openssl/err.h>
+# include <openssl/obj_mac.h>
+# include <openssl/objects.h>
+# include <openssl/rand.h>
+# include <openssl/bn.h>
+# include <openssl/opensslconf.h>
+
+static const char *kP256DefaultResult =
+    "A1E24B223B8E81BC1FFF99BAFB909EDB895FACDE7D6DA5EF5E7B3255FB378E0F";
+
+/*
+ * Perform a deterministic walk on the curve, by starting from |point| and
+ * using the X-coordinate of the previous point as the next scalar for
+ * point multiplication.
+ * Returns the X-coordinate of the end result or NULL on error.
+ */
+static BIGNUM *walk_curve(const EC_GROUP *group, EC_POINT *point, int64_t num)
+{
+    BIGNUM *scalar = NULL;
+    int64_t i;
+
+    if (!TEST_ptr(scalar = BN_new())
+            || !TEST_true(EC_POINT_get_affine_coordinates_GFp(group, point,
+                                                              scalar,
+                                                              NULL, NULL)))
+        goto err;
+
+    for (i = 0; i < num; i++) {
+        if (!TEST_true(EC_POINT_mul(group, point, NULL, point, scalar, NULL))
+                || !TEST_true(EC_POINT_get_affine_coordinates_GFp(group, point,
+                                                                  scalar,
+                                                                  NULL, NULL)))
+            goto err;
+    }
+    return scalar;
+
+err:
+    BN_free(scalar);
+    return NULL;
+}
+
+static int test_curve()
+{
+    EC_GROUP *group = NULL;
+    EC_POINT *point = NULL;
+    BIGNUM *result = NULL, *expected_result = NULL;
+    int ret = 0;
+
+    /*
+     * We currently hard-code P-256, though adaptation to other curves.
+     * would be straightforward.
+     */
+    if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1))
+            || !TEST_ptr(point = EC_POINT_dup(EC_GROUP_get0_generator(group),
+                                              group))
+            || !TEST_ptr(result = walk_curve(group, point, num_repeats)))
+        return 0;
+
+    if (print_mode) {
+        BN_print(bio_out, result);
+        BIO_printf(bio_out, "\n");
+        ret = 1;
+    } else {
+        if (!TEST_true(BN_hex2bn(&expected_result, kP256DefaultResult))
+                || !TEST_ptr(expected_result)
+                || !TEST_BN_eq(result, expected_result))
+            goto err;
+        ret = 1;
+    }
+
+err:
+    EC_GROUP_free(group);
+    EC_POINT_free(point);
+    BN_free(result);
+    BN_free(expected_result);
+    return ret;
+}
+#endif
+
+static int atoi64(const char *in, int64_t *result)
+{
+    int64_t ret = 0;
+
+    for ( ; *in != '\0'; in++) {
+        char c = *in;
+
+        if (!isdigit(c))
+            return 0;
+        ret *= 10;
+        ret += (c - '0');
+    }
+    *result = ret;
+    return 1;
+}
+
+/*
+ * Stress test the curve. If the '-num' argument is given, runs the loop
+ * |num| times and prints the resulting X-coordinate. Otherwise runs the test
+ * the default number of times and compares against the expected result.
+ */
+int test_main(int argc, char *argv[])
+{
+    const char *argv0 = argv[0];
+
+    if (!atoi64(NUM_REPEATS, &num_repeats)) {
+        TEST_error("Cannot parse " NUM_REPEATS);
+        return EXIT_FAILURE;
+    }
+    /*
+     * TODO(openssl-team): code under test/ should be able to reuse the option
+     * parsing framework currently in apps/.
+     */
+    argc--;
+    argv++;
+    while (argc >= 1) {
+        if (strcmp(*argv, "-num") == 0) {
+            if (--argc < 1
+                    || !atoi64(*++argv, &num_repeats)
+                    || num_repeats < 0) {
+                TEST_error("Bad -num argument\n");
+                return EXIT_FAILURE;
+            }
+            print_mode = 1;
+        } else {
+            TEST_error("Unknown option %s\n", *argv);
+            return EXIT_FAILURE;
+        }
+        argc--;
+        argv++;
+    }
+
+#ifndef OPENSSL_NO_EC
+    ADD_TEST(test_curve);
+#endif
+    return run_tests(argv0);
+}