Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93) * Add Chacha20-Poly1305 authenticated encryption * Add general AEAD approach. * Add [email protected] algo using LibTomCrypt chacha and poly1305 routines. Chacha20-Poly1305 is generally faster than AES256 on CPU w/o dedicated AES instructions, having the same key size. Compiling in will add ~5,5kB to binary size on x86-64. function old new delta chacha_crypt - 1397 +1397 _poly1305_block - 608 +608 poly1305_done - 595 +595 dropbear_chachapoly_crypt - 457 +457 .rodata 26976 27392 +416 poly1305_process - 290 +290 poly1305_init - 221 +221 chacha_setup - 218 +218 encrypt_packet 1068 1270 +202 dropbear_chachapoly_getlength - 147 +147 decrypt_packet 756 897 +141 chacha_ivctr64 - 137 +137 read_packet 543 637 +94 dropbear_chachapoly_start - 94 +94 read_kex_algos 792 880 +88 chacha_keystream - 69 +69 dropbear_mode_chachapoly - 48 +48 sshciphers 280 320 +40 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_chachapoly_mac - 24 +24 dropbear_chachapoly - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 5388/0) Total: 5388 bytes * Add AES128-GCM and AES256-GCM authenticated encryption * Add general AES-GCM mode. * Add [email protected] and [email protected] algo using LibTomCrypt gcm routines. AES-GCM is combination of AES CTR mode and GHASH, slower than AES-CTR on CPU w/o dedicated AES/GHASH instructions therefore disabled by default. Compiling in will add ~6kB to binary size on x86-64. function old new delta gcm_process - 1060 +1060 .rodata 26976 27808 +832 gcm_gf_mult - 820 +820 gcm_add_aad - 660 +660 gcm_shift_table - 512 +512 gcm_done - 471 +471 gcm_add_iv - 384 +384 gcm_init - 347 +347 dropbear_gcm_crypt - 309 +309 encrypt_packet 1068 1270 +202 decrypt_packet 756 897 +141 gcm_reset - 118 +118 read_packet 543 637 +94 read_kex_algos 792 880 +88 sshciphers 280 360 +80 gcm_mult_h - 80 +80 dropbear_gcm_start - 62 +62 dropbear_mode_gcm - 48 +48 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_ghash - 24 +24 dropbear_gcm_getlength - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 6434/0) Total: 6434 bytes

#include <tomcrypt_test.h>

#ifdef LTC_PKCS_1

int pkcs_1_test(void)
{
   unsigned char buf[3][128];
   int res1, res2, res3, prng_idx, hash_idx, err;
   unsigned long x, y, l1, l2, l3, i1, i2, lparamlen, saltlen, modlen;
   static const unsigned char lparam[] = { 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 };

   /* get hash/prng  */
   hash_idx = find_hash("sha1");
   prng_idx = find_prng("yarrow");
   
   if (hash_idx == -1 || prng_idx == -1) {
      fprintf(stderr, "pkcs_1 tests require sha1/yarrow");
      return 1;
   }   

   srand(time(NULL));
   /* do many tests */
   for (x = 0; x < 100; x++) {
      zeromem(buf, sizeof(buf));

      /* make a dummy message (of random length) */
      l3 = (rand() & 31) + 8;
      for (y = 0; y < l3; y++) buf[0][y] = rand() & 255;

      /* pick a random lparam len [0..16] */
      lparamlen = abs(rand()) % 17;

      /* pick a random saltlen 0..16 */
      saltlen   = abs(rand()) % 17;

      /* LTC_PKCS #1 v2.0 supports modlens not multiple of 8 */
      modlen = 800 + (abs(rand()) % 224);

      /* encode it */
      l1 = sizeof(buf[1]);
      DO(pkcs_1_oaep_encode(buf[0], l3, lparam, lparamlen, modlen, &yarrow_prng, prng_idx, hash_idx, buf[1], &l1));

      /* decode it */
      l2 = sizeof(buf[2]);
      DO(pkcs_1_oaep_decode(buf[1], l1, lparam, lparamlen, modlen, hash_idx, buf[2], &l2, &res1));

      if (res1 != 1 || l2 != l3 || memcmp(buf[2], buf[0], l3) != 0) {
         fprintf(stderr, "Outsize == %lu, should have been %lu, res1 = %d, lparamlen = %lu, msg contents follow.\n", l2, l3, res1, lparamlen);
         fprintf(stderr, "ORIGINAL:\n");
         for (x = 0; x < l3; x++) {
             fprintf(stderr, "%02x ", buf[0][x]);
         }
         fprintf(stderr, "\nRESULT:\n");
         for (x = 0; x < l2; x++) {
             fprintf(stderr, "%02x ", buf[2][x]);
         }
         fprintf(stderr, "\n\n");
         return 1;
      }

      /* test PSS */
      l1 = sizeof(buf[1]);
      DO(pkcs_1_pss_encode(buf[0], l3, saltlen, &yarrow_prng, prng_idx, hash_idx, modlen, buf[1], &l1));
      DO(pkcs_1_pss_decode(buf[0], l3, buf[1], l1, saltlen, hash_idx, modlen, &res1));
      
      buf[0][i1 = abs(rand()) % l3] ^= 1;
      DO(pkcs_1_pss_decode(buf[0], l3, buf[1], l1, saltlen, hash_idx, modlen, &res2));

      buf[0][i1] ^= 1;
      buf[1][i2 = abs(rand()) % (l1 - 1)] ^= 1;
      pkcs_1_pss_decode(buf[0], l3, buf[1], l1, saltlen, hash_idx, modlen, &res3);
      if (!(res1 == 1 && res2 == 0 && res3 == 0)) {
         fprintf(stderr, "PSS failed: %d, %d, %d, %lu, %lu\n", res1, res2, res3, l3, saltlen);
         return 1;
      }
   }
   return 0;
}

#else

int pkcs_1_test(void)
{
   fprintf(stderr, "NOP");
   return 0;
}

#endif


/* $Source$ */
/* $Revision$ */
/* $Date$ */