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"

#ifdef LTC_SOBER128

int sober128_stream_test(void)
{
#ifndef LTC_TEST
   return CRYPT_NOP;
#else
   unsigned char key[16] = { 0x74, 0x65, 0x73, 0x74, 0x20, 0x6b, 0x65, 0x79,
                             0x20, 0x31, 0x32, 0x38, 0x62, 0x69, 0x74, 0x73 };
   unsigned char iv[4]   = { 0x00, 0x00, 0x00, 0x00 };
   unsigned char out[20] = { 0x43, 0x50, 0x0c, 0xcf, 0x89, 0x91, 0x9f, 0x1d,
                             0xaa, 0x37, 0x74, 0x95, 0xf4, 0xb4, 0x58, 0xc2,
                             0x40, 0x37, 0x8b, 0xbb };
   int err, len = 20;
   unsigned char  src[20], dst[20];
   sober128_state st;

   XMEMSET(src, 0, len); /* input */
   if ((err = sober128_stream_setup(&st, key, sizeof(key))) != CRYPT_OK) return err;
   if ((err = sober128_stream_setiv(&st, iv, sizeof(iv))) != CRYPT_OK)   return err;
   if ((err = sober128_stream_crypt(&st, src, len, dst)) != CRYPT_OK)    return err;
   if ((err = sober128_stream_done(&st)) != CRYPT_OK)                    return err;
   if (compare_testvector(dst, len, out, len, "SOBER-128", 0)) {
      return CRYPT_FAIL_TESTVECTOR;
   }
   return CRYPT_OK;
#endif
}

#endif

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