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Diffstat (limited to 'src/crypto/constant_time_test.c')
| -rw-r--r-- | src/crypto/constant_time_test.c | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/src/crypto/constant_time_test.c b/src/crypto/constant_time_test.c new file mode 100644 index 0000000..bc127c1 --- /dev/null +++ b/src/crypto/constant_time_test.c @@ -0,0 +1,307 @@ +/* + * Utilities for constant-time cryptography. + * + * Author: Emilia Kasper (emilia@openssl.org) + * Based on previous work by Bodo Moeller, Emilia Kasper, Adam Langley + * (Google). + * ==================================================================== + * Copyright (c) 2014 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +#include "internal.h" + +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> + + +static const unsigned int CONSTTIME_TRUE = (unsigned)(~0); +static const unsigned int CONSTTIME_FALSE = 0; +static const uint8_t CONSTTIME_TRUE_8 = 0xff; +static const uint8_t CONSTTIME_FALSE_8 = 0; + +static int test_binary_op(unsigned int (*op)(unsigned int a, unsigned int b), + const char* op_name, unsigned int a, unsigned int b, + int is_true) { + unsigned c = op(a, b); + if (is_true && c != CONSTTIME_TRUE) { + fprintf(stderr, + "Test failed for %s(%du, %du): expected %du (TRUE), got %du\n", + op_name, a, b, CONSTTIME_TRUE, c); + return 1; + } else if (!is_true && c != CONSTTIME_FALSE) { + fprintf(stderr, + "Test failed for %s(%du, %du): expected %du (FALSE), got %du\n", + op_name, a, b, CONSTTIME_FALSE, c); + return 1; + } + return 0; +} + +static int test_binary_op_8(uint8_t (*op)(unsigned int a, unsigned int b), + const char* op_name, unsigned int a, unsigned int b, + int is_true) { + uint8_t c = op(a, b); + if (is_true && c != CONSTTIME_TRUE_8) { + fprintf(stderr, + "Test failed for %s(%du, %du): expected %u (TRUE), got %u\n", + op_name, a, b, CONSTTIME_TRUE_8, c); + return 1; + } else if (!is_true && c != CONSTTIME_FALSE_8) { + fprintf(stderr, + "Test failed for %s(%du, %du): expected %u (FALSE), got %u\n", + op_name, a, b, CONSTTIME_FALSE_8, c); + return 1; + } + return 0; +} + +static int test_is_zero(unsigned int a) { + unsigned int c = constant_time_is_zero(a); + if (a == 0 && c != CONSTTIME_TRUE) { + fprintf(stderr, + "Test failed for constant_time_is_zero(%du): expected %du (TRUE), " + "got %du\n", + a, CONSTTIME_TRUE, c); + return 1; + } else if (a != 0 && c != CONSTTIME_FALSE) { + fprintf(stderr, + "Test failed for constant_time_is_zero(%du): expected %du (FALSE), " + "got %du\n", + a, CONSTTIME_FALSE, c); + return 1; + } + return 0; +} + +static int test_is_zero_8(unsigned int a) { + uint8_t c = constant_time_is_zero_8(a); + if (a == 0 && c != CONSTTIME_TRUE_8) { + fprintf(stderr, + "Test failed for constant_time_is_zero(%du): expected %u (TRUE), " + "got %u\n", + a, CONSTTIME_TRUE_8, c); + return 1; + } else if (a != 0 && c != CONSTTIME_FALSE) { + fprintf(stderr, + "Test failed for constant_time_is_zero(%du): expected %u (FALSE), " + "got %u\n", + a, CONSTTIME_FALSE_8, c); + return 1; + } + return 0; +} + +static int test_select(unsigned int a, unsigned int b) { + unsigned int selected = constant_time_select(CONSTTIME_TRUE, a, b); + if (selected != a) { + fprintf(stderr, + "Test failed for constant_time_select(%du, %du," + "%du): expected %du(first value), got %du\n", + CONSTTIME_TRUE, a, b, a, selected); + return 1; + } + selected = constant_time_select(CONSTTIME_FALSE, a, b); + if (selected != b) { + fprintf(stderr, + "Test failed for constant_time_select(%du, %du," + "%du): expected %du(second value), got %du\n", + CONSTTIME_FALSE, a, b, b, selected); + return 1; + } + return 0; +} + +static int test_select_8(uint8_t a, uint8_t b) { + uint8_t selected = constant_time_select_8(CONSTTIME_TRUE_8, a, b); + if (selected != a) { + fprintf(stderr, + "Test failed for constant_time_select(%u, %u," + "%u): expected %u(first value), got %u\n", + CONSTTIME_TRUE, a, b, a, selected); + return 1; + } + selected = constant_time_select_8(CONSTTIME_FALSE_8, a, b); + if (selected != b) { + fprintf(stderr, + "Test failed for constant_time_select(%u, %u," + "%u): expected %u(second value), got %u\n", + CONSTTIME_FALSE, a, b, b, selected); + return 1; + } + return 0; +} + +static int test_select_int(int a, int b) { + int selected = constant_time_select_int(CONSTTIME_TRUE, a, b); + if (selected != a) { + fprintf(stderr, + "Test failed for constant_time_select(%du, %d," + "%d): expected %d(first value), got %d\n", + CONSTTIME_TRUE, a, b, a, selected); + return 1; + } + selected = constant_time_select_int(CONSTTIME_FALSE, a, b); + if (selected != b) { + fprintf(stderr, + "Test failed for constant_time_select(%du, %d," + "%d): expected %d(second value), got %d\n", + CONSTTIME_FALSE, a, b, b, selected); + return 1; + } + return 0; +} + +static int test_eq_int(int a, int b) { + unsigned int equal = constant_time_eq_int(a, b); + if (a == b && equal != CONSTTIME_TRUE) { + fprintf(stderr, + "Test failed for constant_time_eq_int(%d, %d): expected %du(TRUE), " + "got %du\n", + a, b, CONSTTIME_TRUE, equal); + return 1; + } else if (a != b && equal != CONSTTIME_FALSE) { + fprintf(stderr, + "Test failed for constant_time_eq_int(%d, %d): expected " + "%du(FALSE), got %du\n", + a, b, CONSTTIME_FALSE, equal); + return 1; + } + return 0; +} + +static int test_eq_int_8(int a, int b) { + uint8_t equal = constant_time_eq_int_8(a, b); + if (a == b && equal != CONSTTIME_TRUE_8) { + fprintf(stderr, + "Test failed for constant_time_eq_int_8(%d, %d): expected " + "%u(TRUE), got %u\n", + a, b, CONSTTIME_TRUE_8, equal); + return 1; + } else if (a != b && equal != CONSTTIME_FALSE_8) { + fprintf(stderr, + "Test failed for constant_time_eq_int_8(%d, %d): expected " + "%u(FALSE), got %u\n", + a, b, CONSTTIME_FALSE_8, equal); + return 1; + } + return 0; +} + +static unsigned int test_values[] = {0, 1, 1024, 12345, 32000, UINT_MAX / 2 - 1, + UINT_MAX / 2, UINT_MAX / 2 + 1, + UINT_MAX - 1, UINT_MAX}; + +static uint8_t test_values_8[] = {0, 1, 2, 20, 32, 127, 128, 129, 255}; + +static int signed_test_values[] = { + 0, 1, -1, 1024, -1024, 12345, -12345, + 32000, -32000, INT_MAX, INT_MIN, INT_MAX - 1, INT_MIN + 1}; + +int main(int argc, char* argv[]) { + unsigned int a, b, i, j; + int c, d; + uint8_t e, f; + int num_failed = 0, num_all = 0; + fprintf(stdout, "Testing constant time operations...\n"); + + for (i = 0; i < sizeof(test_values) / sizeof(int); ++i) { + a = test_values[i]; + num_failed += test_is_zero(a); + num_failed += test_is_zero_8(a); + num_all += 2; + for (j = 0; j < sizeof(test_values) / sizeof(int); ++j) { + b = test_values[j]; + num_failed += + test_binary_op(&constant_time_lt, "constant_time_lt", a, b, a < b); + num_failed += test_binary_op_8(&constant_time_lt_8, "constant_time_lt_8", + a, b, a < b); + num_failed += + test_binary_op(&constant_time_lt, "constant_time_lt_8", b, a, b < a); + num_failed += test_binary_op_8(&constant_time_lt_8, "constant_time_lt_8", + b, a, b < a); + num_failed += + test_binary_op(&constant_time_ge, "constant_time_ge", a, b, a >= b); + num_failed += test_binary_op_8(&constant_time_ge_8, "constant_time_ge_8", + a, b, a >= b); + num_failed += + test_binary_op(&constant_time_ge, "constant_time_ge", b, a, b >= a); + num_failed += test_binary_op_8(&constant_time_ge_8, "constant_time_ge_8", + b, a, b >= a); + num_failed += + test_binary_op(&constant_time_eq, "constant_time_eq", a, b, a == b); + num_failed += test_binary_op_8(&constant_time_eq_8, "constant_time_eq_8", + a, b, a == b); + num_failed += + test_binary_op(&constant_time_eq, "constant_time_eq", b, a, b == a); + num_failed += test_binary_op_8(&constant_time_eq_8, "constant_time_eq_8", + b, a, b == a); + num_failed += test_select(a, b); + num_all += 13; + } + } + + for (i = 0; i < sizeof(signed_test_values) / sizeof(int); ++i) { + c = signed_test_values[i]; + for (j = 0; j < sizeof(signed_test_values) / sizeof(int); ++j) { + d = signed_test_values[j]; + num_failed += test_select_int(c, d); + num_failed += test_eq_int(c, d); + num_failed += test_eq_int_8(c, d); + num_all += 3; + } + } + + for (i = 0; i < sizeof(test_values_8); ++i) { + e = test_values_8[i]; + for (j = 0; j < sizeof(test_values_8); ++j) { + f = test_values_8[j]; + num_failed += test_select_8(e, f); + num_all += 1; + } + } + + if (!num_failed) { + fprintf(stdout, "ok (ran %d tests)\n", num_all); + fprintf(stdout, "PASS\n"); + return EXIT_SUCCESS; + } else { + fprintf(stdout, "%d of %d tests failed!\n", num_failed, num_all); + return EXIT_FAILURE; + } +} |