options: Complete the transition to numeric toggles (`#if') For the sake of review, this commit alters only the code; the affiliated comments within the source files also need to be updated, but doing so now would obscure the operational changes that have been made here. * All on/off options have been switched to the numeric `#if' variant; that is the only way to make this `default_options.h.in' thing work in a reasonable manner. * There is now some very minor compile-time checking of the user's choice of options. * NO_FAST_EXPTMOD doesn't seem to be used, so it has been removed. * ENABLE_USER_ALGO_LIST was supposed to be renamed DROPBEAR_USER_ALGO_LIST, and this commit completes that work. * DROPBEAR_FUZZ seems to be a relatively new, as-yet undocumented option, which was added by the following commit: commit 6e0b539e9ca0b5628c6c5a3d118ad6a2e79e8039 Author: Matt Johnston <[email protected]> Date: Tue May 23 22:29:21 2017 +0800 split out checkpubkey_line() separately It has now been added to `sysoptions.h' and defined as `0' by default. * The configuration option `DROPBEAR_PASSWORD_ENV' is no longer listed in `default_options.h.in'; it is no longer meant to be set by the user, and is instead left to be defined in `sysoptions.h' (where it was already being defined) as merely the name of the environment variable in question: DROPBEAR_PASSWORD To enable or disable use of that environment variable, the user must now toggle `DROPBEAR_USE_DROPBEAR_PASSWORD'. * The sFTP support is now toggled by setting `DROPBEAR_SFTPSERVER', and the path of the sFTP server program is set independently through the usual SFTPSERVER_PATH.

/* 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 f9_init.c
  F9 Support, start an F9 state
*/

#ifdef LTC_F9_MODE

/** Initialize F9-MAC state
  @param f9    [out] f9 state to initialize
  @param cipher  Index of cipher to use
  @param key     [in]  Secret key
  @param keylen  Length of secret key in octets
  Return CRYPT_OK on success
*/
int f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen)
{
   int            x, err;

   LTC_ARGCHK(f9   != NULL);
   LTC_ARGCHK(key  != NULL);

   /* schedule the key */
   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
      return err;
   }

#ifdef LTC_FAST
   if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
       return CRYPT_INVALID_ARG;
   }
#endif

   if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &f9->key)) != CRYPT_OK) {
      goto done;
   }

   /* make the second key */
   for (x = 0; (unsigned)x < keylen; x++) {
      f9->akey[x] = key[x] ^ 0xAA;
   }

   /* setup struct */
   zeromem(f9->IV,  cipher_descriptor[cipher].block_length);
   zeromem(f9->ACC, cipher_descriptor[cipher].block_length);
   f9->blocksize = cipher_descriptor[cipher].block_length;
   f9->cipher    = cipher;
   f9->buflen    = 0;
   f9->keylen    = keylen;
done:
   return err;
}

#endif

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