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

/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 */

#include "tomcrypt.h"

/**
  @file compare_testvector.c
  Function to compare two testvectors and print a (detailed) error-message if required, Steffen Jaeckel
*/

#if defined(LTC_TEST) && defined(LTC_TEST_DBG)
static void _print_hex(const char* what, const void* v, const unsigned long l)
{
  const unsigned char* p = v;
  unsigned long x, y = 0, z;
  fprintf(stderr, "%s contents: \n", what);
  for (x = 0; x < l; ) {
      fprintf(stderr, "%02X ", p[x]);
      if (!(++x % 16) || x == l) {
         if((x % 16) != 0) {
            z = 16 - (x % 16);
            if(z >= 8)
               fprintf(stderr, " ");
            for (; z != 0; --z) {
               fprintf(stderr, "   ");
            }
         }
         fprintf(stderr, " | ");
         for(; y < x; y++) {
            if((y % 8) == 0)
               fprintf(stderr, " ");
            if(isgraph(p[y]))
               fprintf(stderr, "%c", p[y]);
            else
               fprintf(stderr, ".");
         }
         fprintf(stderr, "\n");
      }
      else if((x % 8) == 0) {
         fprintf(stderr, " ");
      }
  }
}
#endif

/**
  Compare two test-vectors

  @param is             The data as it is
  @param is_len         The length of is
  @param should         The data as it should
  @param should_len     The length of should
  @param what           The type of the data
  @param which          The iteration count
  @return 0 on equality, -1 or 1 on difference
*/
int compare_testvector(const void* is, const unsigned long is_len, const void* should, const unsigned long should_len, const char* what, int which)
{
   int res = 0;
   if(is_len != should_len)
      res = is_len > should_len ? -1 : 1;
   else
      res = XMEMCMP(is, should, is_len);

#if defined(LTC_TEST) && defined(LTC_TEST_DBG)
   if (res != 0) {
      fprintf(stderr, "Testvector #%i of %s failed:\n", which, what);
      _print_hex("SHOULD", should, should_len);
      _print_hex("IS    ", is, is_len);
   }
#else
   LTC_UNUSED_PARAM(which);
   LTC_UNUSED_PARAM(what);
#endif

   return res;
}

/* ref:         $Format:%D$ */
/* git commit:  $Format:%H$ */
/* commit time: $Format:%ai$ */