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

/* test the ciphers and hashes using their built-in self-tests */

#include <tomcrypt_test.h>

int cipher_hash_test(void)
{
   int           x;
   unsigned char buf[4096];
   unsigned long n;
   prng_state    nprng;
   
   /* test ciphers */
   for (x = 0; cipher_descriptor[x].name != NULL; x++) {
      DO(cipher_descriptor[x].test());
   }
   
   /* test hashes */
   for (x = 0; hash_descriptor[x].name != NULL; x++) {
      DO(hash_descriptor[x].test());
   }
 
   /* test prngs (test, import/export */
   for (x = 0; prng_descriptor[x].name != NULL; x++) {
      DO(prng_descriptor[x].test());
      DO(prng_descriptor[x].start(&nprng));
      DO(prng_descriptor[x].add_entropy((unsigned char *)"helloworld12", 12, &nprng));
      DO(prng_descriptor[x].ready(&nprng));
      n = sizeof(buf);
      DO(prng_descriptor[x].pexport(buf, &n, &nprng));
      prng_descriptor[x].done(&nprng);
      DO(prng_descriptor[x].pimport(buf, n, &nprng));
      DO(prng_descriptor[x].ready(&nprng));
      if (prng_descriptor[x].read(buf, 100, &nprng) != 100) {
         fprintf(stderr, "Error reading from imported PRNG!\n");
         exit(EXIT_FAILURE);
      }
      prng_descriptor[x].done(&nprng);
   }
   
   return 0;
}

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