libtomcrypt/tests/modes_test.c

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

int modes_test(void)
{
   int ret = CRYPT_NOP;
#ifdef LTC_CBC_MODE
   symmetric_CBC cbc;
#endif
#ifdef LTC_CFB_MODE
   symmetric_CFB cfb;
#endif
#ifdef LTC_OFB_MODE
   symmetric_OFB ofb;
#endif
#if defined(LTC_CBC_MODE) || defined(LTC_CFB_MODE) || defined(LTC_OFB_MODE)
   unsigned char pt[64], ct[64], tmp[64], key[16], iv[16], iv2[16];
   int cipher_idx;
   unsigned long l;

   /* make a random pt, key and iv */
   yarrow_read(pt,  64, &yarrow_prng);
   yarrow_read(key, 16, &yarrow_prng);
   yarrow_read(iv,  16, &yarrow_prng);

   /* get idx of AES handy */
   cipher_idx = find_cipher("aes");
   if (cipher_idx == -1) {
      fprintf(stderr, "test requires AES");
      return 1;
   }
#endif

#ifdef LTC_F8_MODE
   DO(ret = f8_test_mode());
#endif

#ifdef LTC_LRW_MODE
   DO(ret = lrw_test());
#endif

#ifdef LTC_CBC_MODE
   /* test CBC mode */
   /* encode the block */
   DO(ret = cbc_start(cipher_idx, iv, key, 16, 0, &cbc));
   l = sizeof(iv2);
   DO(ret = cbc_getiv(iv2, &l, &cbc));
   if (l != 16 || memcmp(iv2, iv, 16)) {
      fprintf(stderr, "cbc_getiv failed");
      return 1;
   }
   DO(ret = cbc_encrypt(pt, ct, 64, &cbc));

   /* decode the block */
   DO(ret = cbc_setiv(iv2, l, &cbc));
   zeromem(tmp, sizeof(tmp));
   DO(ret = cbc_decrypt(ct, tmp, 64, &cbc));
   if (memcmp(tmp, pt, 64) != 0) {
      fprintf(stderr, "CBC failed");
      return 1;
   }
#endif

#ifdef LTC_CFB_MODE
   /* test CFB mode */
   /* encode the block */
   DO(ret = cfb_start(cipher_idx, iv, key, 16, 0, &cfb));
   l = sizeof(iv2);
   DO(ret = cfb_getiv(iv2, &l, &cfb));
   /* note we don't memcmp iv2/iv since cfb_start processes the IV for the first block */
   if (l != 16) {
      fprintf(stderr, "cfb_getiv failed");
      return 1;
   }
   DO(ret = cfb_encrypt(pt, ct, 64, &cfb));

   /* decode the block */
   DO(ret = cfb_setiv(iv, l, &cfb));
   zeromem(tmp, sizeof(tmp));
   DO(ret = cfb_decrypt(ct, tmp, 64, &cfb));
   if (memcmp(tmp, pt, 64) != 0) {
      fprintf(stderr, "CFB failed");
      return 1;
   }
#endif

#ifdef LTC_OFB_MODE
   /* test OFB mode */
   /* encode the block */
   DO(ret = ofb_start(cipher_idx, iv, key, 16, 0, &ofb));
   l = sizeof(iv2);
   DO(ret = ofb_getiv(iv2, &l, &ofb));
   if (l != 16 || memcmp(iv2, iv, 16)) {
      fprintf(stderr, "ofb_getiv failed");
      return 1;
   }
   DO(ret = ofb_encrypt(pt, ct, 64, &ofb));

   /* decode the block */
   DO(ret = ofb_setiv(iv2, l, &ofb));
   zeromem(tmp, sizeof(tmp));
   DO(ret = ofb_decrypt(ct, tmp, 64, &ofb));
   if (memcmp(tmp, pt, 64) != 0) {
      fprintf(stderr, "OFB failed");
      return 1;
   }
#endif

#if defined(LTC_CTR_MODE) && defined(LTC_RIJNDAEL)
   DO(ret = ctr_test());
#endif

#ifdef LTC_XTS_MODE
   DO(ret = xts_test());
#endif

   return 0;
}