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/* nettle-internal.h
*
* Things that are used only by the testsuite and benchmark, and
* subject to change.
*/
/* 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., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#ifndef NETTLE_INTERNAL_H_INCLUDED
#define NETTLE_INTERNAL_H_INCLUDED
#include "nettle-meta.h"
/* Temporary allocation, for systems that don't support alloca. Note
* that the allocation requests should always be reasonably small, so
* that they can fit on the stack. For non-alloca systems, we use a
* fix maximum size, and abort if we ever need anything larger. */
#if HAVE_ALLOCA
# define TMP_DECL(name, type, max) type *name
# define TMP_ALLOC(name, size) (name = alloca(sizeof (*name) * size))
#else /* !HAVE_ALLOCA */
# define TMP_DECL(name, type, max) type name[max]
# define TMP_ALLOC(name, size) \
do { if (size > (sizeof(name) / sizeof(name[0]))) abort(); } while (0)
#endif
/* Arbitrary limits which apply to systems that don't have alloca */
#define NETTLE_MAX_BIGNUM_BITS 10000
#define NETTLE_MAX_BIGNUM_SIZE ((NETTLE_MAX_BIGNUM_BITS + 7)/8)
#define NETTLE_MAX_HASH_BLOCK_SIZE 128
#define NETTLE_MAX_HASH_DIGEST_SIZE 64
#define NETTLE_MAX_SEXP_ASSOC 17
#define NETTLE_MAX_CIPHER_BLOCK_SIZE 32
/* Doesn't quite fit with the other algorithms, because of the weak
* keys. Weak keys are not reported, the functions will simply crash
* if you try to use a weak key. */
extern const struct nettle_cipher nettle_des;
extern const struct nettle_cipher nettle_des3;
extern const struct nettle_cipher nettle_blowfish128;
/* For benchmarking only, sets no iv and lies about the block size. */
extern const struct nettle_cipher nettle_salsa20;
/* Glue to openssl, for comparative benchmarking. Code in
* examples/nettle-openssl.c. */
extern const struct nettle_cipher nettle_openssl_aes128;
extern const struct nettle_cipher nettle_openssl_aes192;
extern const struct nettle_cipher nettle_openssl_aes256;
extern const struct nettle_cipher nettle_openssl_arcfour128;
extern const struct nettle_cipher nettle_openssl_blowfish128;
extern const struct nettle_cipher nettle_openssl_des;
extern const struct nettle_cipher nettle_openssl_cast128;
extern const struct nettle_hash nettle_openssl_md5;
extern const struct nettle_hash nettle_openssl_sha1;
/* Tentative interface for "authenticated encryption with associated
data" algorithms. Should be moved to nettle-meta.h when stable. */
struct nettle_aead
{
const char *name;
unsigned context_size;
/* Block size of the input, and the size of the output digest */
unsigned block_size;
/* Suggested key size; other sizes are sometimes possible. */
unsigned key_size;
nettle_set_key_func *set_key;
nettle_set_key_func *set_iv;
nettle_hash_update_func *update;
nettle_crypt_func *encrypt;
nettle_crypt_func *decrypt;
nettle_hash_digest_func *digest;
};
#define _NETTLE_AEAD(type, TYPE, name, key_size) { \
#type "-" #name #key_size, \
sizeof(struct type##_##name##_ctx), \
TYPE##_BLOCK_SIZE, \
key_size / 8, \
(nettle_set_key_func *) type##_##name##_set_key, \
(nettle_set_key_func *) type##_##name##_set_iv, \
(nettle_hash_update_func *) type##_##name##_update, \
(nettle_crypt_func *) type##_##name##_encrypt, \
(nettle_crypt_func *) type##_##name##_decrypt, \
(nettle_hash_digest_func *) type##_##name##_digest, \
}
extern const struct nettle_aead nettle_gcm_aes128;
extern const struct nettle_aead nettle_gcm_aes192;
extern const struct nettle_aead nettle_gcm_aes256;
extern const struct nettle_aead nettle_gcm_camellia128;
extern const struct nettle_aead nettle_gcm_camellia192;
extern const struct nettle_aead nettle_gcm_camellia256;
extern const struct nettle_aead nettle_gcm_serpent128;
extern const struct nettle_aead nettle_gcm_serpent192;
extern const struct nettle_aead nettle_gcm_serpent256;
extern const struct nettle_aead nettle_gcm_twofish128;
extern const struct nettle_aead nettle_gcm_twofish192;
extern const struct nettle_aead nettle_gcm_twofish256;
#endif /* NETTLE_INTERNAL_H_INCLUDED */
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