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/* abstract_crypto.h
*
* Interface to block cryptos and hash functions
*
*/
/* lsh, an implementation of the ssh protocol
*
* Copyright (C) 1998 Niels Mller
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef LSH_ABSTRACT_CRYPTO_H_INCLUDED
#define LSH_ABSTRACT_CRYPTO_H_INCLUDED
#include <nettle/nettle-meta.h>
#include "list.h"
/* Forward declaration, real declaration in nettle/sexp.h. */
struct sexp_iterator;
#define GABA_DECLARE
#include "abstract_crypto.h.x"
#undef GABA_DECLARE
/* GABA:
(class
(name crypto_instance)
(vars
(block_size . uint32_t)
; Length must be a multiple of the block size.
; NOTE: src == dst is allowed, but no other overlaps.
(crypt method void
"uint32_t length"
"struct lsh_string *dst" "uint32_t di"
"const struct lsh_string *src" "uint32_t si")))
*/
#define CRYPT(instance, length, dst, di, src, si) \
((instance)->crypt((instance), (length), (dst), (di), (src), (si)))
#define CRYPTO_ENCRYPT 0
#define CRYPTO_DECRYPT 1
/* GABA:
(class
(name crypto_algorithm)
(vars
(block_size . uint32_t)
(key_size . uint32_t)
(iv_size . uint32_t)
(make_crypt method (object crypto_instance)
"int mode" "const uint8_t *key" "const uint8_t *iv")))
*/
#define MAKE_CRYPT(crypto, mode, key, iv) \
((crypto)->make_crypt((crypto), (mode), (key), (iv)))
#define MAKE_ENCRYPT(crypto, key, iv) \
MAKE_CRYPT((crypto), CRYPTO_ENCRYPT, (key), (iv))
#define MAKE_DECRYPT(crypto, key, iv) \
MAKE_CRYPT((crypto), CRYPTO_DECRYPT, (key), (iv))
/* Hashes. */
/* We have no need for methods here, hashes are sufficiently regular
* that struct nettle_hash sufficies. Only reason to use methods would
* be to make it possible to use hashes and macs interchangably, and
* that doesn't seem terribly useful. */
/* GABA:
(class
(name hash_instance)
(vars
(type . "const struct nettle_hash *")
(ctx var-array char)))
*/
/* Happens to work for both hash_instance and hash_algorithm. */
#define HASH_SIZE(h) ((h)->type->digest_size)
/* FIXME: Maybe change these back to macros? */
void
hash_update(struct hash_instance *self,
uint32_t length, const uint8_t *data);
/* Returns digest in a newly allocated string. */
struct lsh_string *
hash_digest_string(struct hash_instance *self);
struct hash_instance *
hash_copy(struct hash_instance *self);
/* GABA:
(class
(name hash_algorithm)
(vars
(type . "const struct nettle_hash *")))
*/
struct hash_instance *
make_hash(const struct hash_algorithm *self);
/* GABA:
(class
(name mac_instance)
(vars
(mac_size . uint32_t)
(update method void
"uint32_t length" "const uint8_t *data")
; Returns the string, for convenience
(digest method "struct lsh_string *" "struct lsh_string *res" "uint32_t pos")))
*/
#define MAC_UPDATE(instance, length, data) \
((instance)->update((instance), (length), (data)))
#define MAC_DIGEST(instance, res, pos) \
((instance)->digest((instance), (res), (pos)))
#define MAC_DIGEST_STRING(instance) \
MAC_DIGEST((instance), lsh_string_alloc((instance)->mac_size), 0)
/* GABA:
(class
(name mac_algorithm)
(vars
(mac_size . uint32_t)
; Recommended key size
(key_size . uint32_t)
(make_mac method (object mac_instance)
"uint32_t length" "const uint8_t *key")))
*/
#define MAKE_MAC(m, l, key) ((m)->make_mac((m), (l), (key)))
/* GABA:
(class
(name verifier)
(vars
(verify method int
"int algorithm"
"uint32_t length" "const uint8_t *data"
"uint32_t signature_length" "const uint8_t *signature_data")
(public_key method (string))
; Returns (public-key (<pub-sig-alg-id> <s-expr>*))
(public_spki_key method (string) "int transport")))
*/
#define VERIFY(verifier, algorithm, length, data, slength, sdata) \
((verifier)->verify((verifier), (algorithm), (length), (data), (slength), (sdata)))
#define PUBLIC_KEY(verifier) ((verifier)->public_key((verifier)))
#define PUBLIC_SPKI_KEY(verifier, t) ((verifier)->public_spki_key((verifier), (t)))
/* GABA:
(class
(name signer)
(vars
; Returns a non-spki signature
(sign method (string)
"int algorithm" "uint32_t length" "const uint8_t *data")
(get_verifier method (object verifier))))
*/
#define SIGN(signer, algorithm, length, data) \
((signer)->sign((signer), (algorithm), (length), (data)))
#define SIGNER_GET_VERIFIER(signer) ((signer)->get_verifier((signer)))
/* GABA:
(class
(name signature_algorithm)
(vars
; Iterators should point past the algorithm tag
(make_signer method (object signer)
"struct sexp_iterator *i")
(make_verifier method (object verifier)
"struct sexp_iterator *i")))
*/
#define MAKE_SIGNER(a, i) \
((a)->make_signer((a), (i)))
#define MAKE_VERIFIER(a, i) \
((a)->make_verifier((a), (i)))
/* Simple hashing */
struct lsh_string *
hash_string(const struct hash_algorithm *a,
const struct lsh_string *in,
int free);
/* Used only by the testsuite */
struct lsh_string *
mac_string(struct mac_algorithm *a,
const struct lsh_string *key,
int kfree,
const struct lsh_string *in,
int ifree);
struct lsh_string *
crypt_string(struct crypto_instance *c,
const struct lsh_string *in,
int free);
struct lsh_string *
crypt_string_pad(struct crypto_instance *c,
const struct lsh_string *in,
int free);
struct lsh_string *
crypt_string_unpad(struct crypto_instance *c,
const struct lsh_string *in,
int free);
#endif /* LSH_ABSTRACT_CRYPTO_H_INCLUDED */
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