66 lines
1.3 KiB
C++
66 lines
1.3 KiB
C++
// Those tests work only with Clang and Memory Sanitizer
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#include <gtest/gtest.h>
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#include <common/ct_check.h>
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#include <stdio.h>
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TEST(ConstantTime, CtGrind_Negative) {
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unsigned char a[16], b[16];
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unsigned i;
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memset(a, 42, 16);
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memset(b, 42, 16);
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ct_poison(a, 16);
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for (i = 0; i < 16; i++) {
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ct_expect_umr();
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if (a[i] != b[i]) {
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break;
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}
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ct_require_umr();
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}
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ct_purify(a, 16);
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// Ensure buffers are not optimized-out
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ASSERT_EQ(a[0], b[0]);
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}
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TEST(ConstantTime, CtGrind_Positive_NoAccess) {
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unsigned i;
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char result = 0;
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unsigned char a[16], b[16];
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memset(a, 42, sizeof(a));
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memset(b, 42, sizeof(b));
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ct_poison(a, 16);
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for (i = 0; i < 16; i++) {
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result |= a[i] ^ b[i];
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}
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ct_purify(a, 16);
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// Purify result, to allow check that otherwise
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// would be not constant-time.
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ct_purify(&result, 1);
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ASSERT_EQ(result, 0);
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}
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TEST(ConstantTime, CtGrind_Negative_UseSecretAsIndex) {
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static const unsigned char tab[2] = {1, 0};
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unsigned char a[16];
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unsigned char result;
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memset(a, 42, sizeof(a));
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ct_poison(a, 16);
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ct_expect_umr();
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result = tab[a[0] & 1];
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ct_require_umr();
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ct_purify(a, 16);
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// Ensure variables are not optimized-out
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ct_purify(&result, 1);
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ASSERT_EQ(result, 1);
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}
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