tests/timingsafe_bcmp.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3
   4 #include <darwintest.h>
   5
   6 T_DECL(timingsafe_bcmp, "tests for timingsafe_bcmp(3)")
   7 {
   8         // empty
   9         T_ASSERT_EQ(0, timingsafe_bcmp(NULL, NULL, 0), NULL);
  10         T_ASSERT_EQ(0, timingsafe_bcmp("foo", "foo", 0), NULL);
  11         T_ASSERT_EQ(0, timingsafe_bcmp("foo", "bar", 0), NULL);
  12
  13         // equal
  14         T_ASSERT_EQ(0, timingsafe_bcmp("foo", "foo", strlen("foo")), NULL);
  15
  16         // unequal
  17         T_ASSERT_EQ(1, timingsafe_bcmp("foo", "bar", strlen("foo")), NULL);
  18         T_ASSERT_EQ(1, timingsafe_bcmp("foo", "goo", strlen("foo")), NULL);
  19         T_ASSERT_EQ(1, timingsafe_bcmp("foo", "fpo", strlen("foo")), NULL);
  20         T_ASSERT_EQ(1, timingsafe_bcmp("foo", "fop", strlen("foo")), NULL);
  21
  22         // all possible bitwise differences
  23         int i;
  24         for (i = 1; i < 256; i += 1) {
  25                 unsigned char a = 0;
  26                 unsigned char b = (unsigned char)i;
  27
  28                 T_ASSERT_EQ(1, timingsafe_bcmp(&a, &b, sizeof(a)), NULL);
  29         }
  30
  31         // large
  32         char buf[1024 * 16];
  33         arc4random_buf(buf, sizeof(buf));
  34         T_ASSERT_EQ(0, timingsafe_bcmp(buf, buf, sizeof(buf)), NULL);
  35         T_ASSERT_EQ(1, timingsafe_bcmp(buf, buf + 1, sizeof(buf) - 1), NULL);
  36         T_ASSERT_EQ(1, timingsafe_bcmp(buf, buf + 128, 128), NULL);
  37
  38         memcpy(buf+128, buf, 128);
  39         T_ASSERT_EQ(0, timingsafe_bcmp(buf, buf + 128, 128), NULL);
  40 }