Constant-time utilities
Pull constant-time methods out to a separate header, add tests.
Reviewed-by: Bodo Moeller <bodo@openssl.org>
diff --git a/crypto/constant_time_test.c b/crypto/constant_time_test.c
new file mode 100644
index 0000000..89fad7d
--- /dev/null
+++ b/crypto/constant_time_test.c
@@ -0,0 +1,205 @@
+/* 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 = ~0;
+static const unsigned int CONSTTIME_FALSE = 0;
+static const unsigned char CONSTTIME_TRUE_8 = ~0;
+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 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};
+
+int main(int argc, char *argv[])
+ {
+ unsigned int a, b, i, j;
+ 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_failed += test_binary_op(&constant_time_lt,
+ "constant_time_lt", a, a, 0);
+ num_failed += test_binary_op_8(&constant_time_lt_8,
+ "constant_time_lt_8", a, a, 0);
+ num_failed += test_binary_op(&constant_time_ge,
+ "constant_time_ge", a, a, 1);
+ num_failed += test_binary_op_8(&constant_time_ge_8,
+ "constant_time_ge_8", a, a, 1);
+ num_failed += test_binary_op(&constant_time_eq,
+ "constant_time_eq", a, a, 1);
+ num_failed += test_binary_op_8(&constant_time_eq_8,
+ "constant_time_eq_8", a, a, 1);
+ num_all += 8;
+ for (j = i + 1; 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_all += 12;
+ }
+ }
+
+ 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;
+ }
+ }
