/*

  chronyd/chronyc - Programs for keeping computer clocks accurate.

 **********************************************************************

 * Copyright (C) Miroslav Lichvar  2012, 2018

 * 

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as

 * published by the Free Software Foundation.

 * 

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License for more details.

 * 

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 * 

 **********************************************************************

  =======================================================================

  Routines implementing crypto hashing using tomcrypt library.

  */

#include <tomcrypt.h>

#include "config.h"

#include "hash.h"

#include "util.h"

struct hash {

  const char *name;

  const char *int_name;

  const struct ltc_hash_descriptor *desc;

};

static const struct hash hashes[] = {

  { "MD5", "md5", &md5_desc },

#ifdef LTC_RIPEMD128

  { "RMD128", "rmd128", &rmd128_desc },

#endif

#ifdef LTC_RIPEMD160

  { "RMD160", "rmd160", &rmd160_desc },

#endif

#ifdef LTC_RIPEMD256

  { "RMD256", "rmd256", &rmd256_desc },

#endif

#ifdef LTC_RIPEMD320

  { "RMD320", "rmd320", &rmd320_desc },

#endif

#ifdef LTC_SHA1

  { "SHA1", "sha1", &sha1_desc },

#endif

#ifdef LTC_SHA256

  { "SHA256", "sha256", &sha256_desc },

#endif

#ifdef LTC_SHA384

  { "SHA384", "sha384", &sha384_desc },

#endif

#ifdef LTC_SHA512

  { "SHA512", "sha512", &sha512_desc },

#endif

#ifdef LTC_SHA3

  { "SHA3-224", "sha3-224", &sha3_224_desc },

  { "SHA3-256", "sha3-256", &sha3_256_desc },

  { "SHA3-384", "sha3-384", &sha3_384_desc },

  { "SHA3-512", "sha3-512", &sha3_512_desc },

#endif

#ifdef LTC_TIGER

  { "TIGER", "tiger", &tiger_desc },

#endif

#ifdef LTC_WHIRLPOOL

  { "WHIRLPOOL", "whirlpool", &whirlpool_desc },

#endif

  { NULL, NULL, NULL }

};

int

HSH_GetHashId(const char *name)

{

  int i, h;

  for (i = 0; hashes[i].name; i++) {

    if (!strcmp(name, hashes[i].name))

      break;

  }

  if (!hashes[i].name)

    return -1; /* not found */

  h = find_hash(hashes[i].int_name);

  if (h >= 0)

    return h; /* already registered */

  /* register and try again */

  register_hash(hashes[i].desc);

  return find_hash(hashes[i].int_name);

}

unsigned int

HSH_Hash(int id, const unsigned char *in1, unsigned int in1_len,

    const unsigned char *in2, unsigned int in2_len,

    unsigned char *out, unsigned int out_len)

{

  unsigned char buf[MAX_HASH_LENGTH];

  unsigned long len;

  int r;

  len = sizeof (buf);

  if (in2)

    r = hash_memory_multi(id, buf, &len,

                          in1, (unsigned long)in1_len,

                          in2, (unsigned long)in2_len, NULL, 0);

  else

    r = hash_memory(id, in1, in1_len, buf, &len;;

  if (r != CRYPT_OK)

    return 0;

  len = MIN(len, out_len);

  memcpy(out, buf, len);

  return len;

}

void

HSH_Finalise(void)

{

}