150 lines
4.1 KiB
C
150 lines
4.1 KiB
C
/* BEGIN_HEADER */
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/** \file test_suite_constant_time.function
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*
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* Functional testing of functions in the constant_time module.
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*
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* The tests are instrumented with #TEST_CF_SECRET and #TEST_CF_PUBLIC
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* (see tests/include/test/constant_flow.h) so that running the tests
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* under MSan or Valgrind will detect a non-constant-time implementation.
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*/
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#include <mbedtls/constant_time.h>
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#include <constant_time_internal.h>
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#include <constant_time_invasive.h>
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#include <test/constant_flow.h>
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/* END_HEADER */
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/* BEGIN_CASE */
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void mbedtls_ct_memcmp_null()
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{
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uint32_t x = 0;
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TEST_ASSERT(mbedtls_ct_memcmp(&x, NULL, 0) == 0);
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TEST_ASSERT(mbedtls_ct_memcmp(NULL, &x, 0) == 0);
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TEST_ASSERT(mbedtls_ct_memcmp(NULL, NULL, 0) == 0);
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}
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/* END_CASE */
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/* BEGIN_CASE */
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void mbedtls_ct_memcmp(int same, int size, int offset)
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{
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uint8_t *a = NULL, *b = NULL;
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TEST_CALLOC(a, size + offset);
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TEST_CALLOC(b, size + offset);
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TEST_CF_SECRET(a + offset, size);
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TEST_CF_SECRET(b + offset, size);
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/* Construct data that matches, if same == -1, otherwise
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* same gives the number of bytes (after the initial offset)
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* that will match; after that it will differ.
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*/
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for (int i = 0; i < size + offset; i++) {
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a[i] = i & 0xff;
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if (same == -1 || (i - offset) < same) {
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b[i] = a[i];
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} else {
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b[i] = (i + 1) & 0xff;
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}
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}
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int reference = memcmp(a + offset, b + offset, size);
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int actual = mbedtls_ct_memcmp(a + offset, b + offset, size);
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TEST_CF_PUBLIC(a + offset, size);
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TEST_CF_PUBLIC(b + offset, size);
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if (same == -1 || same >= size) {
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TEST_ASSERT(reference == 0);
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TEST_ASSERT(actual == 0);
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} else {
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TEST_ASSERT(reference != 0);
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TEST_ASSERT(actual != 0);
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}
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exit:
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mbedtls_free(a);
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mbedtls_free(b);
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_SSL_SOME_SUITES_USE_MAC */
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void mbedtls_ct_memcpy_if_eq(int eq, int size, int offset)
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{
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uint8_t *src = NULL, *result = NULL, *expected = NULL;
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TEST_CALLOC(src, size + offset);
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TEST_CALLOC(result, size + offset);
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TEST_CALLOC(expected, size + offset);
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for (int i = 0; i < size + offset; i++) {
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src[i] = 1;
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result[i] = 0xff;
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expected[i] = eq ? 1 : 0xff;
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}
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int one, secret_eq;
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TEST_CF_SECRET(&one, sizeof(one));
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TEST_CF_SECRET(&secret_eq, sizeof(secret_eq));
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one = 1;
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secret_eq = eq;
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mbedtls_ct_memcpy_if_eq(result + offset, src, size, secret_eq, one);
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TEST_CF_PUBLIC(&one, sizeof(one));
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TEST_CF_PUBLIC(&secret_eq, sizeof(secret_eq));
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TEST_MEMORY_COMPARE(expected, size, result + offset, size);
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for (int i = 0; i < size + offset; i++) {
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src[i] = 1;
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result[i] = 0xff;
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expected[i] = eq ? 1 : 0xff;
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}
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TEST_CF_SECRET(&one, sizeof(one));
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TEST_CF_SECRET(&secret_eq, sizeof(secret_eq));
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one = 1;
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secret_eq = eq;
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mbedtls_ct_memcpy_if_eq(result, src + offset, size, secret_eq, one);
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TEST_CF_PUBLIC(&one, sizeof(one));
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TEST_CF_PUBLIC(&secret_eq, sizeof(secret_eq));
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TEST_MEMORY_COMPARE(expected, size, result, size);
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exit:
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mbedtls_free(src);
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mbedtls_free(result);
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mbedtls_free(expected);
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC:MBEDTLS_TEST_HOOKS */
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void ssl_cf_memcpy_offset(int offset_min, int offset_max, int len)
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{
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unsigned char *dst = NULL;
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unsigned char *src = NULL;
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size_t src_len = offset_max + len;
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size_t secret;
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TEST_CALLOC(dst, len);
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TEST_CALLOC(src, src_len);
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/* Fill src in a way that we can detect if we copied the right bytes */
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mbedtls_test_rnd_std_rand(NULL, src, src_len);
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for (secret = offset_min; secret <= (size_t) offset_max; secret++) {
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mbedtls_test_set_step((int) secret);
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TEST_CF_SECRET(&secret, sizeof(secret));
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mbedtls_ct_memcpy_offset(dst, src, secret,
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offset_min, offset_max, len);
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TEST_CF_PUBLIC(&secret, sizeof(secret));
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TEST_CF_PUBLIC(dst, len);
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TEST_MEMORY_COMPARE(dst, len, src + secret, len);
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}
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exit:
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mbedtls_free(dst);
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mbedtls_free(src);
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}
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/* END_CASE */
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