diff options
Diffstat (limited to 'openssl/crypto/constant_time_test.c')
| -rw-r--r-- | openssl/crypto/constant_time_test.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/openssl/crypto/constant_time_test.c b/openssl/crypto/constant_time_test.c new file mode 100644 index 000000000..d9c6a44ae --- /dev/null +++ b/openssl/crypto/constant_time_test.c @@ -0,0 +1,330 @@ +/* crypto/constant_time_test.c */ +/* + * 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 "../crypto/constant_time_locl.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 unsigned char CONSTTIME_TRUE_8 = 0xff; +static const unsigned char 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(unsigned char (*op)(unsigned int a, unsigned int b), + const char* op_name, unsigned int a, unsigned int b, int is_true) + { + unsigned char 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) + { + unsigned char 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(unsigned char a, unsigned char b) + { + unsigned char 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) + { + unsigned char 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 unsigned char 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; + unsigned char 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); + return EXIT_SUCCESS; + } + else + { + fprintf(stdout, "%d of %d tests failed!\n", num_failed, num_all); + return EXIT_FAILURE; + } + } |