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safe_math_test.c
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/*
* Copyright 2021-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdlib.h>
/*
* Uncomment this if the fallback non-builtin overflow checking is to
* be tested.
*/
/*#define OPENSSL_NO_BUILTIN_OVERFLOW_CHECKING*/
#include "internal/nelem.h"
#include "internal/safe_math.h"
#include "testutil.h"
/* Create the safe math instances we're interested in */
OSSL_SAFE_MATH_SIGNED(int, int)
OSSL_SAFE_MATH_UNSIGNED(uint, unsigned int)
OSSL_SAFE_MATH_UNSIGNED(size_t, size_t)
static const struct {
int a, b;
int sum_err, sub_err, mul_err, div_err, mod_err, div_round_up_err;
int neg_a_err, neg_b_err, abs_a_err, abs_b_err;
} test_ints[] = { /* + - * / % /r -a -b |a||b| */
{ 1, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ -1, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 1, -3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ -1, -3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 3, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ -3, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 2, -3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ -2, -3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ INT_MAX, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ INT_MAX, 2, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0 },
{ INT_MAX, 4, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0 },
{ INT_MAX - 3 , 4, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0 },
{ INT_MIN, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0 },
{ 1, INT_MIN, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1 },
{ INT_MIN, 2, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0 },
{ 2, INT_MIN, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1 },
{ INT_MIN, -1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0 },
{ INT_MAX, INT_MIN, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1 },
{ INT_MIN, INT_MAX, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0 },
{ 3, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0 },
};
static int test_int_ops(int n)
{
int err, r, s;
const int a = test_ints[n].a, b = test_ints[n].b;
err = 0;
r = safe_add_int(a, b, &err);
if (!TEST_int_eq(err, test_ints[n].sum_err)
|| (!err && !TEST_int_eq(r, a + b)))
goto err;
err = 0;
r = safe_sub_int(a, b, &err);
if (!TEST_int_eq(err, test_ints[n].sub_err)
|| (!err && !TEST_int_eq(r, a - b)))
goto err;
err = 0;
r = safe_mul_int(a, b, &err);
if (!TEST_int_eq(err, test_ints[n].mul_err)
|| (!err && !TEST_int_eq(r, a * b)))
goto err;
err = 0;
r = safe_div_int(a, b, &err);
if (!TEST_int_eq(err, test_ints[n].div_err)
|| (!err && !TEST_int_eq(r, a / b)))
goto err;
err = 0;
r = safe_mod_int(a, b, &err);
if (!TEST_int_eq(err, test_ints[n].mod_err)
|| (!err && !TEST_int_eq(r, a % b)))
goto err;
err = 0;
r = safe_div_round_up_int(a, b, &err);
if (!TEST_int_eq(err, test_ints[n].div_round_up_err))
goto err;
s = safe_mod_int(a, b, &err);
s = safe_add_int(safe_div_int(a, b, &err), s != 0, &err);
if (!err && !TEST_int_eq(r, s))
goto err;
err = 0;
r = safe_neg_int(a, &err);
if (!TEST_int_eq(err, test_ints[n].neg_a_err)
|| (!err && !TEST_int_eq(r, -a)))
goto err;
err = 0;
r = safe_neg_int(b, &err);
if (!TEST_int_eq(err, test_ints[n].neg_b_err)
|| (!err && !TEST_int_eq(r, -b)))
goto err;
err = 0;
r = safe_abs_int(a, &err);
if (!TEST_int_eq(err, test_ints[n].abs_a_err)
|| (!err && !TEST_int_eq(r, a < 0 ? -a : a)))
goto err;
err = 0;
r = safe_abs_int(b, &err);
if (!TEST_int_eq(err, test_ints[n].abs_b_err)
|| (!err && !TEST_int_eq(r, b < 0 ? -b : b)))
goto err;
return 1;
err:
TEST_info("a = %d b = %d r = %d err = %d", a, b, r, err);
return 0;
}
static const struct {
unsigned int a, b;
int sum_err, sub_err, mul_err, div_err, mod_err, div_round_up_err;
} test_uints[] = { /* + - * / % /r */
{ 3, 1, 0, 0, 0, 0, 0, 0 },
{ 1, 3, 0, 1, 0, 0, 0, 0 },
{ UINT_MAX, 1, 1, 0, 0, 0, 0, 0 },
{ UINT_MAX, 2, 1, 0, 1, 0, 0, 0 },
{ UINT_MAX, 16, 1, 0, 1, 0, 0, 0 },
{ UINT_MAX - 13, 16, 1, 0, 1, 0, 0, 0 },
{ 1, UINT_MAX, 1, 1, 0, 0, 0, 0 },
{ 2, UINT_MAX, 1, 1, 1, 0, 0, 0 },
{ UINT_MAX, 0, 0, 0, 0, 1, 1, 1 },
};
static int test_uint_ops(int n)
{
int err;
unsigned int r;
const unsigned int a = test_uints[n].a, b = test_uints[n].b;
err = 0;
r = safe_add_uint(a, b, &err);
if (!TEST_int_eq(err, test_uints[n].sum_err)
|| (!err && !TEST_uint_eq(r, a + b)))
goto err;
err = 0;
r = safe_sub_uint(a, b, &err);
if (!TEST_int_eq(err, test_uints[n].sub_err)
|| (!err && !TEST_uint_eq(r, a - b)))
goto err;
err = 0;
r = safe_mul_uint(a, b, &err);
if (!TEST_int_eq(err, test_uints[n].mul_err)
|| (!err && !TEST_uint_eq(r, a * b)))
goto err;
err = 0;
r = safe_div_uint(a, b, &err);
if (!TEST_int_eq(err, test_uints[n].div_err)
|| (!err && !TEST_uint_eq(r, a / b)))
goto err;
err = 0;
r = safe_mod_uint(a, b, &err);
if (!TEST_int_eq(err, test_uints[n].mod_err)
|| (!err && !TEST_uint_eq(r, a % b)))
goto err;
err = 0;
r = safe_div_round_up_uint(a, b, &err);
if (!TEST_int_eq(err, test_uints[n].div_round_up_err)
|| (!err && !TEST_uint_eq(r, a / b + (a % b != 0))))
goto err;
err = 0;
r = safe_neg_uint(a, &err);
if (!TEST_int_eq(err, a != 0) || (!err && !TEST_uint_eq(r, 0)))
goto err;
err = 0;
r = safe_neg_uint(b, &err);
if (!TEST_int_eq(err, b != 0) || (!err && !TEST_uint_eq(r, 0)))
goto err;
err = 0;
r = safe_abs_uint(a, &err);
if (!TEST_int_eq(err, 0) || !TEST_uint_eq(r, a))
goto err;
err = 0;
r = safe_abs_uint(b, &err);
if (!TEST_int_eq(err, 0) || !TEST_uint_eq(r, b))
goto err;
return 1;
err:
TEST_info("a = %u b = %u r = %u err = %d", a, b, r, err);
return 0;
}
static const struct {
size_t a, b;
int sum_err, sub_err, mul_err, div_err, mod_err, div_round_up_err;
} test_size_ts[] = {
{ 3, 1, 0, 0, 0, 0, 0, 0 },
{ 1, 3, 0, 1, 0, 0, 0, 0 },
{ 36, 8, 0, 0, 0, 0, 0, 0 },
{ SIZE_MAX, 1, 1, 0, 0, 0, 0, 0 },
{ SIZE_MAX, 2, 1, 0, 1, 0, 0, 0 },
{ SIZE_MAX, 8, 1, 0, 1, 0, 0, 0 },
{ SIZE_MAX - 3, 8, 1, 0, 1, 0, 0, 0 },
{ 1, SIZE_MAX, 1, 1, 0, 0, 0, 0 },
{ 2, SIZE_MAX, 1, 1, 1, 0, 0, 0 },
{ 11, 0, 0, 0, 0, 1, 1, 1 },
};
static int test_size_t_ops(int n)
{
int err;
size_t r;
const size_t a = test_size_ts[n].a, b = test_size_ts[n].b;
err = 0;
r = safe_add_size_t(a, b, &err);
if (!TEST_int_eq(err, test_size_ts[n].sum_err)
|| (!err && !TEST_size_t_eq(r, a + b)))
goto err;
err = 0;
r = safe_sub_size_t(a, b, &err);
if (!TEST_int_eq(err, test_size_ts[n].sub_err)
|| (!err && !TEST_size_t_eq(r, a - b)))
goto err;
err = 0;
r = safe_mul_size_t(a, b, &err);
if (!TEST_int_eq(err, test_size_ts[n].mul_err)
|| (!err && !TEST_size_t_eq(r, a * b)))
goto err;
err = 0;
r = safe_div_size_t(a, b, &err);
if (!TEST_int_eq(err, test_size_ts[n].div_err)
|| (!err && !TEST_size_t_eq(r, a / b)))
goto err;
err = 0;
r = safe_mod_size_t(a, b, &err);
if (!TEST_int_eq(err, test_size_ts[n].mod_err)
|| (!err && !TEST_size_t_eq(r, a % b)))
goto err;
err = 0;
r = safe_div_round_up_size_t(a, b, &err);
if (!TEST_int_eq(err, test_size_ts[n].div_round_up_err)
|| (!err && !TEST_size_t_eq(r, a / b + (a % b != 0))))
goto err;
err = 0;
r = safe_neg_size_t(a, &err);
if (!TEST_int_eq(err, a != 0) || (!err && !TEST_size_t_eq(r, 0)))
goto err;
err = 0;
r = safe_neg_size_t(b, &err);
if (!TEST_int_eq(err, b != 0) || (!err && !TEST_size_t_eq(r, 0)))
goto err;
err = 0;
r = safe_abs_size_t(a, &err);
if (!TEST_int_eq(err, 0) || !TEST_size_t_eq(r, a))
goto err;
err = 0;
r = safe_abs_size_t(b, &err);
if (!TEST_int_eq(err, 0) || !TEST_size_t_eq(r, b))
goto err;
return 1;
err:
TEST_info("a = %zu b = %zu r = %zu err = %d", a, b, r, err);
return 0;
}
static const struct {
int a, b, c;
int err;
} test_muldiv_ints[] = {
{ 3, 1, 2, 0 },
{ 1, 3, 2, 0 },
{ -3, 1, 2, 0 },
{ 1, 3, -2, 0 },
{ INT_MAX, INT_MAX, INT_MAX, 0 },
{ INT_MIN, INT_MIN, INT_MAX, 1 },
{ INT_MIN, INT_MIN, INT_MIN, 0 },
{ INT_MAX, 2, 4, 0 },
{ 8, INT_MAX, 4, 1 },
{ INT_MAX, 8, 4, 1 },
{ INT_MIN, 2, 4, 1 },
{ 8, INT_MIN, 4, 1 },
{ INT_MIN, 8, 4, 1 },
{ 3, 4, 0, 1 },
};
static int test_int_muldiv(int n)
{
int err = 0;
int r, real = 0;
const int a = test_muldiv_ints[n].a;
const int b = test_muldiv_ints[n].b;
const int c = test_muldiv_ints[n].c;
r = safe_muldiv_int(a, b, c, &err);
if (c != 0)
real = (int)((int64_t)a * (int64_t)b / (int64_t)c);
if (!TEST_int_eq(err, test_muldiv_ints[n].err)
|| (!err && !TEST_int_eq(r, real))) {
TEST_info("%d * %d / %d r = %d err = %d", a, b, c, r, err);
return 0;
}
return 1;
}
static const struct {
unsigned int a, b, c;
int err;
} test_muldiv_uints[] = {
{ 3, 1, 2, 0 },
{ 1, 3, 2, 0 },
{ UINT_MAX, UINT_MAX, UINT_MAX, 0 },
{ UINT_MAX, 2, 4, 0 },
{ 8, UINT_MAX, 4, 1 },
{ UINT_MAX, 8, 4, 1 },
{ 3, 4, 0, 1 },
};
static int test_uint_muldiv(int n)
{
int err = 0;
unsigned int r, real = 0;
const unsigned int a = test_muldiv_uints[n].a;
const unsigned int b = test_muldiv_uints[n].b;
const unsigned int c = test_muldiv_uints[n].c;
r = safe_muldiv_uint(a, b, c, &err);
if (c != 0)
real = (unsigned int)((uint64_t)a * (uint64_t)b / (uint64_t)c);
if (!TEST_int_eq(err, test_muldiv_uints[n].err)
|| (!err && !TEST_uint_eq(r, real))) {
TEST_info("%u * %u / %u r = %u err = %d", a, b, c, r, err);
return 0;
}
return 1;
}
int setup_tests(void)
{
ADD_ALL_TESTS(test_int_ops, OSSL_NELEM(test_ints));
ADD_ALL_TESTS(test_uint_ops, OSSL_NELEM(test_uints));
ADD_ALL_TESTS(test_size_t_ops, OSSL_NELEM(test_size_ts));
ADD_ALL_TESTS(test_int_muldiv, OSSL_NELEM(test_muldiv_ints));
ADD_ALL_TESTS(test_uint_muldiv, OSSL_NELEM(test_muldiv_uints));
return 1;
}