nettle-meta.h

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

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 2002 Niels Mller
 *  
 * 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 <inttypes.h>

/* Ciphers */
typedef void (*nettle_crypt_func)(void *ctx,
				  unsigned length, uint8_t *dst,
				  const uint8_t *src);

typedef void (*nettle_set_key_func)(void *ctx,
				   unsigned length,
				   const uint8_t *key);


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, keysize) {	\
  #name #keysize,				\
  sizeof(struct name##_ctx),			\
  NAME##_BLOCK_SIZE,				\
  keysize / 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, keysize) {	\
  #name #keysize,				\
  sizeof(struct name##_ctx),			\
  NAME##_BLOCK_SIZE,				\
  keysize / 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_FIX(name, NAME, keysize) {	\
  #name,					\
  sizeof(struct name##_ctx),			\
  NAME##_BLOCK_SIZE,				\
  keysize / 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,		\
}

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_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;


/* Hash algorithms */
typedef void (*nettle_hash_init_func)(void *ctx);
typedef void (*nettle_hash_update_func)(void *ctx,
					unsigned length,
					const uint8_t *src);
typedef void (*nettle_hash_digest_func)(void *ctx,
					unsigned length, uint8_t *dst);

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	\
} 

extern const struct nettle_hash nettle_md5;
extern const struct nettle_hash nettle_sha1;
extern const struct nettle_hash nettle_sha256;


/* ASCII armor codecs */
typedef unsigned (*nettle_armor_encode_func)(uint8_t *dst,
                                             unsigned src_length,
                                             const uint8_t *src);
typedef void (*nettle_armor_init_func)(void *ctx);
typedef unsigned (*nettle_armor_update_func)(void *ctx,
                                             uint8_t *dst,
                                             unsigned src_length,
                                             const uint8_t *src);

struct nettle_armor
{
  const char *name;
  unsigned context_size;
  unsigned text_block_size;
  unsigned binary_block_size;
  nettle_armor_encode_func encode;
  nettle_armor_init_func decode_init;
  nettle_armor_update_func decode_update;
};

#define _NETTLE_ARMOR(name, NAME) {			\
  #name,						\
  sizeof(struct name##_ctx),				\
  NAME##_TEXT_BLOCK_SIZE,				\
  NAME##_BINARY_BLOCK_SIZE,				\
  (nettle_armor_encode_func) name##_encode,		\
  (nettle_armor_init_func) name##_decode_init,		\
  (nettle_armor_update_func) name##_decode_update	\
}

extern const struct nettle_armor nettle_base64;
/* extern const struct nettle_armor nettle_base16; */

#endif /* NETTLE_META_H_INCLUDED */