/* nettle-meta.h
 *
 * Information about algorithms.
 */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 2002 Niels Möller
 *  
 * The nettle library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 * 
 * The nettle library 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 Lesser General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with the nettle library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

#ifndef NETTLE_META_H_INCLUDED
#define NETTLE_META_H_INCLUDED

#include "nettle-types.h"

#ifdef __cplusplus
extern "C" {
#endif


struct nettle_cipher
{
  const char *name;
  
  unsigned context_size;
  
  /* Zero for stream ciphers */
  unsigned block_size;

  /* Suggested key size; other sizes are sometimes possible. */
  unsigned key_size;

  nettle_set_key_func *set_encrypt_key;
  nettle_set_key_func *set_decrypt_key;

  nettle_crypt_func *encrypt;
  nettle_crypt_func *decrypt;
};

#define _NETTLE_CIPHER(name, NAME, key_size) {	\
  #name #key_size,				\
  sizeof(struct name##_ctx),			\
  NAME##_BLOCK_SIZE,				\
  key_size / 8,					\
  (nettle_set_key_func *) name##_set_key,	\
  (nettle_set_key_func *) name##_set_key,	\
  (nettle_crypt_func *) name##_encrypt,		\
  (nettle_crypt_func *) name##_decrypt,		\
}

#define _NETTLE_CIPHER_SEP(name, NAME, key_size) {	\
  #name #key_size,					\
  sizeof(struct name##_ctx),				\
  NAME##_BLOCK_SIZE,					\
  key_size / 8,						\
  (nettle_set_key_func *) name##_set_encrypt_key,	\
  (nettle_set_key_func *) name##_set_decrypt_key,	\
  (nettle_crypt_func *) name##_encrypt,			\
  (nettle_crypt_func *) name##_decrypt,			\
}

#define _NETTLE_CIPHER_SEP_SET_KEY(name, NAME, key_size) {\
  #name #key_size,					\
  sizeof(struct name##_ctx),				\
  NAME##_BLOCK_SIZE,					\
  key_size / 8,						\
  (nettle_set_key_func *) name##_set_encrypt_key,	\
  (nettle_set_key_func *) name##_set_decrypt_key,	\
  (nettle_crypt_func *) name##_crypt,			\
  (nettle_crypt_func *) name##_crypt,			\
}

#define _NETTLE_CIPHER_FIX(name, NAME) {	\
  #name,						\
  sizeof(struct name##_ctx),				\
  NAME##_BLOCK_SIZE,					\
  NAME##_KEY_SIZE,					\
  (nettle_set_key_func *) name##_set_key,		\
  (nettle_set_key_func *) name##_set_key,		\
  (nettle_crypt_func *) name##_encrypt,			\
  (nettle_crypt_func *) name##_decrypt,			\
}

/* null-terminated list of ciphers implemented by this version of nettle */
extern const struct nettle_cipher * const nettle_ciphers[];

extern const struct nettle_cipher nettle_aes128;
extern const struct nettle_cipher nettle_aes192;
extern const struct nettle_cipher nettle_aes256;

extern const struct nettle_cipher nettle_arcfour128;

extern const struct nettle_cipher nettle_camellia128;
extern const struct nettle_cipher nettle_camellia192;
extern const struct nettle_cipher nettle_camellia256;

extern const struct nettle_cipher nettle_cast128;

extern const struct nettle_cipher nettle_serpent128;
extern const struct nettle_cipher nettle_serpent192;
extern const struct nettle_cipher nettle_serpent256;

extern const struct nettle_cipher nettle_twofish128;
extern const struct nettle_cipher nettle_twofish192;
extern const struct nettle_cipher nettle_twofish256;

extern const struct nettle_cipher nettle_arctwo40;
extern const struct nettle_cipher nettle_arctwo64;
extern const struct nettle_cipher nettle_arctwo128;
extern const struct nettle_cipher nettle_arctwo_gutmann128;

struct nettle_hash
{
  const char *name;

  /* Size of the context struct */
  unsigned context_size;

  /* Size of digests */
  unsigned digest_size;
  
  /* Internal block size */
  unsigned block_size;

  nettle_hash_init_func *init;
  nettle_hash_update_func *update;
  nettle_hash_digest_func *digest;
};

#define _NETTLE_HASH(name, NAME) {		\
 #name,						\
 sizeof(struct name##_ctx),			\
 NAME##_DIGEST_SIZE,				\
 NAME##_DATA_SIZE,				\
 (nettle_hash_init_func *) name##_init,		\
 (nettle_hash_update_func *) name##_update,	\
 (nettle_hash_digest_func *) name##_digest	\
} 

/* null-terminated list of digests implemented by this version of nettle */
extern const struct nettle_hash * const nettle_hashes[];

extern const struct nettle_hash nettle_md2;
extern const struct nettle_hash nettle_md4;
extern const struct nettle_hash nettle_md5;
extern const struct nettle_hash nettle_sha1;
extern const struct nettle_hash nettle_sha224;
extern const struct nettle_hash nettle_sha256;
extern const struct nettle_hash nettle_sha384;
extern const struct nettle_hash nettle_sha512;

struct nettle_armor
{
  const char *name;
  unsigned encode_context_size;
  unsigned decode_context_size;

  unsigned encode_final_length;

  nettle_armor_init_func *encode_init;
  nettle_armor_length_func *encode_length;
  nettle_armor_encode_update_func *encode_update;
  nettle_armor_encode_final_func *encode_final;
  
  nettle_armor_init_func *decode_init;
  nettle_armor_length_func *decode_length;
  nettle_armor_decode_update_func *decode_update;
  nettle_armor_decode_final_func *decode_final;
};

#define _NETTLE_ARMOR(name, NAME) {				\
  #name,							\
  sizeof(struct name##_encode_ctx),				\
  sizeof(struct name##_decode_ctx),				\
  NAME##_ENCODE_FINAL_LENGTH,					\
  (nettle_armor_init_func *) name##_encode_init,		\
  (nettle_armor_length_func *) name##_encode_length,		\
  (nettle_armor_encode_update_func *) name##_encode_update,	\
  (nettle_armor_encode_final_func *) name##_encode_final,	\
  (nettle_armor_init_func *) name##_decode_init,		\
  (nettle_armor_length_func *) name##_decode_length,		\
  (nettle_armor_decode_update_func *) name##_decode_update,	\
  (nettle_armor_decode_final_func *) name##_decode_final,	\
}

#define _NETTLE_ARMOR_0(name, NAME) {				\
  #name,							\
  0,								\
  sizeof(struct name##_decode_ctx),				\
  NAME##_ENCODE_FINAL_LENGTH,					\
  (nettle_armor_init_func *) name##_encode_init,		\
  (nettle_armor_length_func *) name##_encode_length,		\
  (nettle_armor_encode_update_func *) name##_encode_update,	\
  (nettle_armor_encode_final_func *) name##_encode_final,	\
  (nettle_armor_init_func *) name##_decode_init,		\
  (nettle_armor_length_func *) name##_decode_length,		\
  (nettle_armor_decode_update_func *) name##_decode_update,	\
  (nettle_armor_decode_final_func *) name##_decode_final,	\
}

/* null-terminated list of armor schemes implemented by this version of nettle */
extern const struct nettle_armor * const nettle_armors[];

extern const struct nettle_armor nettle_base64;
extern const struct nettle_armor nettle_base16;

#ifdef __cplusplus
}
#endif

#endif /* NETTLE_META_H_INCLUDED */
