111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
// Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "internal.h"
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int bssl_constant_time_test_main(void);
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static int test_binary_op_w(crypto_word_t (*op)(crypto_word_t a, crypto_word_t b),
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crypto_word_t a, crypto_word_t b, int is_true) {
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crypto_word_t c = op(a, b);
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if (is_true && c != CONSTTIME_TRUE_W) {
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return 1;
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} else if (!is_true && c != CONSTTIME_FALSE_W) {
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return 1;
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}
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return 0;
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}
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static int test_is_zero_w(crypto_word_t a) {
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crypto_word_t c = constant_time_is_zero_w(a);
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if (a == 0 && c != CONSTTIME_TRUE_W) {
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return 1;
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} else if (a != 0 && c != CONSTTIME_FALSE_W) {
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return 1;
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}
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c = constant_time_is_nonzero_w(a);
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if (a == 0 && c != CONSTTIME_FALSE_W) {
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return 1;
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} else if (a != 0 && c != CONSTTIME_TRUE_W) {
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return 1;
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}
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return 0;
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}
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static int test_select_w(crypto_word_t a, crypto_word_t b) {
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crypto_word_t selected = constant_time_select_w(CONSTTIME_TRUE_W, a, b);
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if (selected != a) {
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return 1;
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}
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selected = constant_time_select_w(CONSTTIME_FALSE_W, a, b);
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if (selected != b) {
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return 1;
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}
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return 0;
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}
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static crypto_word_t test_values_w[] = {
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0,
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1,
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1024,
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12345,
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32000,
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#if defined(OPENSSL_64_BIT)
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0xffffffff / 2 - 1,
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0xffffffff / 2,
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0xffffffff / 2 + 1,
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0xffffffff - 1,
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0xffffffff,
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#endif
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SIZE_MAX / 2 - 1,
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SIZE_MAX / 2,
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SIZE_MAX / 2 + 1,
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SIZE_MAX - 1,
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SIZE_MAX
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};
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int bssl_constant_time_test_main(void) {
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int num_failed = 0;
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for (size_t i = 0;
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i < sizeof(test_values_w) / sizeof(test_values_w[0]); ++i) {
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crypto_word_t a = test_values_w[i];
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num_failed += test_is_zero_w(a);
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for (size_t j = 0;
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j < sizeof(test_values_w) / sizeof(test_values_w[0]); ++j) {
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crypto_word_t b = test_values_w[j];
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num_failed += test_binary_op_w(&constant_time_eq_w, a, b, a == b);
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num_failed += test_binary_op_w(&constant_time_eq_w, b, a, b == a);
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num_failed += test_select_w(a, b);
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}
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}
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return num_failed == 0;
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}
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// Exposes `constant_time_conditional_memcpy` to Rust for tests only.
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void bssl_constant_time_test_conditional_memcpy(uint8_t dst[256], const uint8_t src[256],
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crypto_word_t b) {
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constant_time_conditional_memcpy(dst, src, 256, b);
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}
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// Exposes `constant_time_conditional_memxor` to Rust for tests only.
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void bssl_constant_time_test_conditional_memxor(uint8_t dst[256],
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const uint8_t src[256],
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crypto_word_t b) {
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constant_time_conditional_memxor(dst, src, 256, b);
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}
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