test/ecstresstest.c

   1 /*
   2  * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL licenses, (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_GFp(group, point,
  49                                                               scalar,
  50                                                               NULL, NULL)))
  51         goto err;
  52
  53     for (i = 0; i < num; i++) {
  54         if (!TEST_true(EC_POINT_mul(group, point, NULL, point, scalar, NULL))
  55                 || !TEST_true(EC_POINT_get_affine_coordinates_GFp(group, point,
  56                                                                   scalar,
  57                                                                   NULL, NULL)))
  58             goto err;
  59     }
  60     return scalar;
  61
  62 err:
  63     BN_free(scalar);
  64     return NULL;
  65 }
  66
  67 static int test_curve(void)
  68 {
  69     EC_GROUP *group = NULL;
  70     EC_POINT *point = NULL;
  71     BIGNUM *result = NULL, *expected_result = NULL;
  72     int ret = 0;
  73
  74     /*
  75      * We currently hard-code P-256, though adaptation to other curves.
  76      * would be straightforward.
  77      */
  78     if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1))
  79             || !TEST_ptr(point = EC_POINT_dup(EC_GROUP_get0_generator(group),
  80                                               group))
  81             || !TEST_ptr(result = walk_curve(group, point, num_repeats)))
  82         return 0;
  83
  84     if (print_mode) {
  85         BN_print(bio_out, result);
  86         BIO_printf(bio_out, "\n");
  87         ret = 1;
  88     } else {
  89         if (!TEST_true(BN_hex2bn(&expected_result, kP256DefaultResult))
  90                 || !TEST_ptr(expected_result)
  91                 || !TEST_BN_eq(result, expected_result))
  92             goto err;
  93         ret = 1;
  94     }
  95
  96 err:
  97     EC_GROUP_free(group);
  98     EC_POINT_free(point);
  99     BN_free(result);
 100     BN_free(expected_result);
 101     return ret;
 102 }
 103 #endif
 104
 105 static int atoi64(const char *in, int64_t *result)
 106 {
 107     int64_t ret = 0;
 108
 109     for ( ; *in != '\0'; in++) {
 110         char c = *in;
 111
 112         if (!isdigit((unsigned char)c))
 113             return 0;
 114         ret *= 10;
 115         ret += (c - '0');
 116     }
 117     *result = ret;
 118     return 1;
 119 }
 120
 121 /*
 122  * Stress test the curve. If the '-num' argument is given, runs the loop
 123  * |num| times and prints the resulting X-coordinate. Otherwise runs the test
 124  * the default number of times and compares against the expected result.
 125  */
 126 int setup_tests(void)
 127 {
 128     const char *p;
 129
 130     if (!atoi64(NUM_REPEATS, &num_repeats)) {
 131         TEST_error("Cannot parse " NUM_REPEATS);
 132         return 0;
 133     }
 134     /*
 135      * TODO(openssl-team): code under test/ should be able to reuse the option
 136      * parsing framework currently in apps/.
 137      */
 138     p = test_get_option_argument("-num");
 139     if (p != NULL) {
 140         if (!atoi64(p, &num_repeats)
 141                 || num_repeats < 0)
 142             return 0;
 143         print_mode = 1;
 144     }
 145
 146 #ifndef OPENSSL_NO_EC
 147     ADD_TEST(test_curve);
 148 #endif
 149     return 1;
 150 }