libtom.libtomcrypt/tests/store_test.c

/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
#include <tomcrypt_test.h>

/* Test store/load macros with offsets */
int store_test(void)
{
  unsigned char buf[256];
  unsigned long y;
  ulong32 L, L1;
  ulong64 LL, LL1;
#ifdef LTC_FAST
  unsigned long x, z;
#endif

  for (y = 0; y < 4; y++) {
      L  = 0x12345678UL;
      L1 = 0;
      STORE32L(L, buf + y);
      LOAD32L(L1, buf + y);
      if (L1 != L) {
         fprintf(stderr, "\n32L failed at offset %lu\n", y);
         return 1;
      }
      STORE32H(L, buf + y);
      LOAD32H(L1, buf + y);
      if (L1 != L) {
         fprintf(stderr, "\n32H failed at offset %lu\n", y);
         return 1;
      }
  }

  for (y = 0; y < 8; y++) {
      LL = CONST64 (0x01020304050607);
      LL1 = 0;
      STORE64L(LL, buf + y);
      LOAD64L(LL1, buf + y);
      if (LL1 != LL) {
         fprintf(stderr, "\n64L failed at offset %lu\n", y);
         return 1;
      }
      STORE64H(LL, buf + y);
      LOAD64H(LL1, buf + y);
      if (LL1 != LL) {
         fprintf(stderr, "\n64H failed at offset %lu\n", y);
         return 1;
      }
  }

/* test LTC_FAST */
#ifdef LTC_FAST
  y = 16;

  for (z = 0; z < y; z++) {
     /* fill y bytes with random */
     ENSURE(yarrow_read(buf+z,   y, &yarrow_prng) == y);
     ENSURE(yarrow_read(buf+z+y, y, &yarrow_prng) == y);

     /* now XOR it byte for byte */
     for (x = 0; x < y; x++) {
         buf[2*y+z+x] = buf[z+x] ^ buf[z+y+x];
     }

     /* now XOR it word for word */
     for (x = 0; x < y; x += sizeof(LTC_FAST_TYPE)) {
        *(LTC_FAST_TYPE_PTR_CAST(&buf[3*y+z+x])) = *(LTC_FAST_TYPE_PTR_CAST(&buf[z+x])) ^ *(LTC_FAST_TYPE_PTR_CAST(&buf[z+y+x]));
     }

     if (memcmp(&buf[2*y+z], &buf[3*y+z], y)) {
        fprintf(stderr, "\nLTC_FAST failed at offset %lu\n", z);
        return 1;
     }
  }
#endif
  return 0;
}