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// Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "internal.h"
int bssl_constant_time_test_main(void);
static int test_binary_op_w(crypto_word_t (*op)(crypto_word_t a, crypto_word_t b),
crypto_word_t a, crypto_word_t b, int is_true) {
crypto_word_t c = op(a, b);
if (is_true && c != CONSTTIME_TRUE_W) {
return 1;
} else if (!is_true && c != CONSTTIME_FALSE_W) {
return 1;
}
return 0;
}
static int test_is_zero_w(crypto_word_t a) {
crypto_word_t c = constant_time_is_zero_w(a);
if (a == 0 && c != CONSTTIME_TRUE_W) {
return 1;
} else if (a != 0 && c != CONSTTIME_FALSE_W) {
return 1;
}
c = constant_time_is_nonzero_w(a);
if (a == 0 && c != CONSTTIME_FALSE_W) {
return 1;
} else if (a != 0 && c != CONSTTIME_TRUE_W) {
return 1;
}
return 0;
}
static int test_select_w(crypto_word_t a, crypto_word_t b) {
crypto_word_t selected = constant_time_select_w(CONSTTIME_TRUE_W, a, b);
if (selected != a) {
return 1;
}
selected = constant_time_select_w(CONSTTIME_FALSE_W, a, b);
if (selected != b) {
return 1;
}
return 0;
}
static crypto_word_t test_values_w[] = {
0,
1,
1024,
12345,
32000,
#if defined(OPENSSL_64_BIT)
0xffffffff / 2 - 1,
0xffffffff / 2,
0xffffffff / 2 + 1,
0xffffffff - 1,
0xffffffff,
#endif
SIZE_MAX / 2 - 1,
SIZE_MAX / 2,
SIZE_MAX / 2 + 1,
SIZE_MAX - 1,
SIZE_MAX
};
int bssl_constant_time_test_main(void) {
int num_failed = 0;
for (size_t i = 0;
i < sizeof(test_values_w) / sizeof(test_values_w[0]); ++i) {
crypto_word_t a = test_values_w[i];
num_failed += test_is_zero_w(a);
for (size_t j = 0;
j < sizeof(test_values_w) / sizeof(test_values_w[0]); ++j) {
crypto_word_t b = test_values_w[j];
num_failed += test_binary_op_w(&constant_time_eq_w, a, b, a == b);
num_failed += test_binary_op_w(&constant_time_eq_w, b, a, b == a);
num_failed += test_select_w(a, b);
}
}
return num_failed == 0;
}
// Exposes `constant_time_conditional_memcpy` to Rust for tests only.
void bssl_constant_time_test_conditional_memcpy(uint8_t dst[256], const uint8_t src[256],
crypto_word_t b) {
constant_time_conditional_memcpy(dst, src, 256, b);
}
// Exposes `constant_time_conditional_memxor` to Rust for tests only.
void bssl_constant_time_test_conditional_memxor(uint8_t dst[256],
const uint8_t src[256],
crypto_word_t b) {
constant_time_conditional_memxor(dst, src, 256, b);
}
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