1 /* crypto/constant_time_test.c */
3 * Utilities for constant-time cryptography.
5 * Author: Emilia Kasper (emilia@openssl.org)
6 * Based on previous work by Bodo Moeller, Emilia Kasper, Adam Langley
8 * ====================================================================
9 * Copyright (c) 2014 The OpenSSL Project. All rights reserved.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * "This product includes cryptographic software written by
22 * Eric Young (eay@cryptsoft.com)"
23 * The word 'cryptographic' can be left out if the rouines from the library
24 * being used are not cryptographic related :-).
25 * 4. If you include any Windows specific code (or a derivative thereof) from
26 * the apps directory (application code) you must include an acknowledgement:
27 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
29 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * The licence and distribution terms for any publically available version or
42 * derivative of this code cannot be changed. i.e. this code cannot simply be
43 * copied and put under another distribution licence
44 * [including the GNU Public Licence.]
47 #include "../crypto/constant_time_locl.h"
53 static const unsigned int CONSTTIME_TRUE = ~0;
54 static const unsigned int CONSTTIME_FALSE = 0;
55 static const unsigned char CONSTTIME_TRUE_8 = ~0;
56 static const unsigned char CONSTTIME_FALSE_8 = 0;
58 static int test_binary_op(unsigned int (*op)(unsigned int a, unsigned int b),
59 const char* op_name, unsigned int a, unsigned int b, int is_true)
61 unsigned c = op(a, b);
62 if (is_true && c != CONSTTIME_TRUE)
64 fprintf(stderr, "Test failed for %s(%du, %du): expected %du "
65 "(TRUE), got %du\n", op_name, a, b, CONSTTIME_TRUE, c);
68 else if (!is_true && c != CONSTTIME_FALSE)
70 fprintf(stderr, "Test failed for %s(%du, %du): expected %du "
71 "(FALSE), got %du\n", op_name, a, b, CONSTTIME_FALSE,
78 static int test_binary_op_8(unsigned char (*op)(unsigned int a, unsigned int b),
79 const char* op_name, unsigned int a, unsigned int b, int is_true)
81 unsigned char c = op(a, b);
82 if (is_true && c != CONSTTIME_TRUE_8)
84 fprintf(stderr, "Test failed for %s(%du, %du): expected %u "
85 "(TRUE), got %u\n", op_name, a, b, CONSTTIME_TRUE_8, c);
88 else if (!is_true && c != CONSTTIME_FALSE_8)
90 fprintf(stderr, "Test failed for %s(%du, %du): expected %u "
91 "(FALSE), got %u\n", op_name, a, b, CONSTTIME_FALSE_8,
98 static int test_is_zero(unsigned int a)
100 unsigned int c = constant_time_is_zero(a);
101 if (a == 0 && c != CONSTTIME_TRUE)
103 fprintf(stderr, "Test failed for constant_time_is_zero(%du): "
104 "expected %du (TRUE), got %du\n", a, CONSTTIME_TRUE, c);
107 else if (a != 0 && c != CONSTTIME_FALSE)
109 fprintf(stderr, "Test failed for constant_time_is_zero(%du): "
110 "expected %du (FALSE), got %du\n", a, CONSTTIME_FALSE,
117 static int test_is_zero_8(unsigned int a)
119 unsigned char c = constant_time_is_zero_8(a);
120 if (a == 0 && c != CONSTTIME_TRUE_8)
122 fprintf(stderr, "Test failed for constant_time_is_zero(%du): "
123 "expected %u (TRUE), got %u\n", a, CONSTTIME_TRUE_8, c);
126 else if (a != 0 && c != CONSTTIME_FALSE)
128 fprintf(stderr, "Test failed for constant_time_is_zero(%du): "
129 "expected %u (FALSE), got %u\n", a, CONSTTIME_FALSE_8,
136 static unsigned int test_values[] = {0, 1, 1024, 12345, 32000, UINT_MAX/2-1,
137 UINT_MAX/2, UINT_MAX/2+1, UINT_MAX-1,
140 int main(int argc, char *argv[])
142 unsigned int a, b, i, j;
143 int num_failed = 0, num_all = 0;
144 fprintf(stdout, "Testing constant time operations...\n");
146 for (i = 0; i < sizeof(test_values)/sizeof(int); ++i)
149 num_failed += test_is_zero(a);
150 num_failed += test_is_zero_8(a);
151 num_failed += test_binary_op(&constant_time_lt,
152 "constant_time_lt", a, a, 0);
153 num_failed += test_binary_op_8(&constant_time_lt_8,
154 "constant_time_lt_8", a, a, 0);
155 num_failed += test_binary_op(&constant_time_ge,
156 "constant_time_ge", a, a, 1);
157 num_failed += test_binary_op_8(&constant_time_ge_8,
158 "constant_time_ge_8", a, a, 1);
159 num_failed += test_binary_op(&constant_time_eq,
160 "constant_time_eq", a, a, 1);
161 num_failed += test_binary_op_8(&constant_time_eq_8,
162 "constant_time_eq_8", a, a, 1);
164 for (j = i + 1; j < sizeof(test_values)/sizeof(int); ++j)
167 num_failed += test_binary_op(&constant_time_lt,
168 "constant_time_lt", a, b, a < b);
169 num_failed += test_binary_op_8(&constant_time_lt_8,
170 "constant_time_lt_8", a, b, a < b);
171 num_failed += test_binary_op(&constant_time_lt,
172 "constant_time_lt_8", b, a, b < a);
173 num_failed += test_binary_op_8(&constant_time_lt_8,
174 "constant_time_lt_8", b, a, b < a);
175 num_failed += test_binary_op(&constant_time_ge,
176 "constant_time_ge", a, b, a >= b);
177 num_failed += test_binary_op_8(&constant_time_ge_8,
178 "constant_time_ge_8", a, b, a >= b);
179 num_failed += test_binary_op(&constant_time_ge,
180 "constant_time_ge", b, a, b >= a);
181 num_failed += test_binary_op_8(&constant_time_ge_8,
182 "constant_time_ge_8", b, a, b >= a);
183 num_failed += test_binary_op(&constant_time_eq,
184 "constant_time_eq", a, b, a == b);
185 num_failed += test_binary_op_8(&constant_time_eq_8,
186 "constant_time_eq_8", a, b, a == b);
187 num_failed += test_binary_op(&constant_time_eq,
188 "constant_time_eq", b, a, b == a);
189 num_failed += test_binary_op_8(&constant_time_eq_8,
190 "constant_time_eq_8", b, a, b == a);
197 fprintf(stdout, "ok (ran %d tests)\n", num_all);
202 fprintf(stdout, "%d of %d tests failed!\n", num_failed, num_all);