test/ecstresstest.c

   1 /*
   2  * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  * https://www.openssl.org/source/license.html
   8  * or in the file LICENSE in the source distribution.
   9  */
  10
  11 #include "internal/nelem.h"
  12 #include "testutil.h"
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <ctype.h>
  18
  19 #define NUM_REPEATS "1000000"
  20
  21 static int64_t num_repeats;
  22 static int print_mode = 0;
  23
  24 #ifndef OPENSSL_NO_EC
  25 # include <openssl/ec.h>
  26 # include <openssl/err.h>
  27 # include <openssl/obj_mac.h>
  28 # include <openssl/objects.h>
  29 # include <openssl/rand.h>
  30 # include <openssl/bn.h>
  31 # include <openssl/opensslconf.h>
  32
  33 static const char *kP256DefaultResult =
  34     "A1E24B223B8E81BC1FFF99BAFB909EDB895FACDE7D6DA5EF5E7B3255FB378E0F";
  35
  36 /*
  37  * Perform a deterministic walk on the curve, by starting from |point| and
  38  * using the X-coordinate of the previous point as the next scalar for
  39  * point multiplication.
  40  * Returns the X-coordinate of the end result or NULL on error.
  41  */
  42 static BIGNUM *walk_curve(const EC_GROUP *group, EC_POINT *point, int64_t num)
  43 {
  44     BIGNUM *scalar = NULL;
  45     int64_t i;
  46
  47     if (!TEST_ptr(scalar = BN_new())
  48             || !TEST_true(EC_POINT_get_affine_coordinates(group, point, scalar,
  49                                                           NULL, NULL)))
  50         goto err;
  51
  52     for (i = 0; i < num; i++) {
  53         if (!TEST_true(EC_POINT_mul(group, point, NULL, point, scalar, NULL))
  54                 || !TEST_true(EC_POINT_get_affine_coordinates(group, point,
  55                                                               scalar,
  56                                                               NULL, NULL)))
  57             goto err;
  58     }
  59     return scalar;
  60
  61 err:
  62     BN_free(scalar);
  63     return NULL;
  64 }
  65
  66 static int test_curve(void)
  67 {
  68     EC_GROUP *group = NULL;
  69     EC_POINT *point = NULL;
  70     BIGNUM *result = NULL, *expected_result = NULL;
  71     int ret = 0;
  72
  73     /*
  74      * We currently hard-code P-256, though adaptation to other curves.
  75      * would be straightforward.
  76      */
  77     if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1))
  78             || !TEST_ptr(point = EC_POINT_dup(EC_GROUP_get0_generator(group),
  79                                               group))
  80             || !TEST_ptr(result = walk_curve(group, point, num_repeats)))
  81         return 0;
  82
  83     if (print_mode) {
  84         BN_print(bio_out, result);
  85         BIO_printf(bio_out, "\n");
  86         ret = 1;
  87     } else {
  88         if (!TEST_true(BN_hex2bn(&expected_result, kP256DefaultResult))
  89                 || !TEST_ptr(expected_result)
  90                 || !TEST_BN_eq(result, expected_result))
  91             goto err;
  92         ret = 1;
  93     }
  94
  95 err:
  96     EC_GROUP_free(group);
  97     EC_POINT_free(point);
  98     BN_free(result);
  99     BN_free(expected_result);
 100     return ret;
 101 }
 102 #endif
 103
 104 static int atoi64(const char *in, int64_t *result)
 105 {
 106     int64_t ret = 0;
 107
 108     for ( ; *in != '\0'; in++) {
 109         char c = *in;
 110
 111         if (!isdigit((unsigned char)c))
 112             return 0;
 113         ret *= 10;
 114         ret += (c - '0');
 115     }
 116     *result = ret;
 117     return 1;
 118 }
 119
 120 /*
 121  * Stress test the curve. If the '-num' argument is given, runs the loop
 122  * |num| times and prints the resulting X-coordinate. Otherwise runs the test
 123  * the default number of times and compares against the expected result.
 124  */
 125 int setup_tests(void)
 126 {
 127     const char *p;
 128
 129     if (!atoi64(NUM_REPEATS, &num_repeats)) {
 130         TEST_error("Cannot parse " NUM_REPEATS);
 131         return 0;
 132     }
 133     /*
 134      * TODO(openssl-team): code under test/ should be able to reuse the option
 135      * parsing framework currently in apps/.
 136      */
 137     p = test_get_option_argument("-num");
 138     if (p != NULL) {
 139         if (!atoi64(p, &num_repeats)
 140                 || num_repeats < 0)
 141             return 0;
 142         print_mode = 1;
 143     }
 144
 145 #ifndef OPENSSL_NO_EC
 146     ADD_TEST(test_curve);
 147 #endif
 148     return 1;
 149 }