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 katja_import.c
  Import a PKCS-style Katja key, Tom St Denis
*/

#ifdef LTC_MKAT

/**
  Import an KatjaPublicKey or KatjaPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1]
  @param in      The packet to import from
  @param inlen   It's length (octets)
  @param key     [out] Destination for newly imported key
  @return CRYPT_OK if successful, upon error allocated memory is freed
*/
int katja_import(const unsigned char *in, unsigned long inlen, katja_key *key)
{
   int           err;
   void         *zero;

   LTC_ARGCHK(in  != NULL);
   LTC_ARGCHK(key != NULL);
   LTC_ARGCHK(ltc_mp.name != NULL);

   /* init key */
   if ((err = mp_init_multi(&zero, &key->d, &key->N, &key->dQ,
                            &key->dP, &key->qP, &key->p, &key->q, &key->pq, NULL)) != CRYPT_OK) {
      return err;
   }

   if ((err = der_decode_sequence_multi(in, inlen,
                                  LTC_ASN1_INTEGER, 1UL, key->N,
                                  LTC_ASN1_EOL,     0UL, NULL)) != CRYPT_OK) {
      goto LBL_ERR;
   }

   if (mp_cmp_d(key->N, 0) == LTC_MP_EQ) {
      /* it's a private key */
      if ((err = der_decode_sequence_multi(in, inlen,
                          LTC_ASN1_INTEGER, 1UL, zero,
                          LTC_ASN1_INTEGER, 1UL, key->N,
                          LTC_ASN1_INTEGER, 1UL, key->d,
                          LTC_ASN1_INTEGER, 1UL, key->p,
                          LTC_ASN1_INTEGER, 1UL, key->q,
                          LTC_ASN1_INTEGER, 1UL, key->dP,
                          LTC_ASN1_INTEGER, 1UL, key->dQ,
                          LTC_ASN1_INTEGER, 1UL, key->qP,
                          LTC_ASN1_INTEGER, 1UL, key->pq,
                          LTC_ASN1_EOL,     0UL, NULL)) != CRYPT_OK) {
         goto LBL_ERR;
      }
      key->type = PK_PRIVATE;
   } else {
      /* public we have N */
      key->type = PK_PUBLIC;
   }
   mp_clear(zero);
   return CRYPT_OK;
LBL_ERR:
   mp_clear_multi(zero,    key->d, key->N, key->dQ, key->dP,
                  key->qP, key->p, key->q, key->pq, NULL);
   return err;
}

#endif /* LTC_MRSA */


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