Update constant-time operations.
(Based on upstream's 42af669ff2754dfbe1dd55a0ab56664f82284dc4)
Change-Id: I4d3954fea7471e274c626483a0dfb9d7b3250b74
diff --git a/crypto/constant_time_test.c b/crypto/constant_time_test.c
new file mode 100644
index 0000000..bc127c1
--- /dev/null
+++ b/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;
+ }
+}
