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 "tommath_private.h"
#ifdef BN_S_MP_ADD_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis
 *
 * LibTomMath is a library that provides multiple-precision
 * integer arithmetic as well as number theoretic functionality.
 *
 * The library was designed directly after the MPI library by
 * Michael Fromberger but has been written from scratch with
 * additional optimizations in place.
 *
 * SPDX-License-Identifier: Unlicense
 */

/* low level addition, based on HAC pp.594, Algorithm 14.7 */
int s_mp_add(const mp_int *a, const mp_int *b, mp_int *c)
{
   const mp_int *x;
   int     olduse, res, min, max;

   /* find sizes, we let |a| <= |b| which means we have to sort
    * them.  "x" will point to the input with the most digits
    */
   if (a->used > b->used) {
      min = b->used;
      max = a->used;
      x = a;
   } else {
      min = a->used;
      max = b->used;
      x = b;
   }

   /* init result */
   if (c->alloc < (max + 1)) {
      if ((res = mp_grow(c, max + 1)) != MP_OKAY) {
         return res;
      }
   }

   /* get old used digit count and set new one */
   olduse = c->used;
   c->used = max + 1;

   {
      mp_digit u, *tmpa, *tmpb, *tmpc;
      int i;

      /* alias for digit pointers */

      /* first input */
      tmpa = a->dp;

      /* second input */
      tmpb = b->dp;

      /* destination */
      tmpc = c->dp;

      /* zero the carry */
      u = 0;
      for (i = 0; i < min; i++) {
         /* Compute the sum at one digit, T[i] = A[i] + B[i] + U */
         *tmpc = *tmpa++ + *tmpb++ + u;

         /* U = carry bit of T[i] */
         u = *tmpc >> (mp_digit)DIGIT_BIT;

         /* take away carry bit from T[i] */
         *tmpc++ &= MP_MASK;
      }

      /* now copy higher words if any, that is in A+B
       * if A or B has more digits add those in
       */
      if (min != max) {
         for (; i < max; i++) {
            /* T[i] = X[i] + U */
            *tmpc = x->dp[i] + u;

            /* U = carry bit of T[i] */
            u = *tmpc >> (mp_digit)DIGIT_BIT;

            /* take away carry bit from T[i] */
            *tmpc++ &= MP_MASK;
         }
      }

      /* add carry */
      *tmpc++ = u;

      /* clear digits above oldused */
      for (i = c->used; i < olduse; i++) {
         *tmpc++ = 0;
      }
   }

   mp_clamp(c);
   return MP_OKAY;
}
#endif

/* ref:         HEAD -> master, tag: v1.1.0 */
/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
/* commit time: 2019-01-28 20:32:32 +0100 */