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/*
* Copyright (C) 2011-2012 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS 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 3 of
* the License, or (at your option) any later version.
*
* This 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 this program. If not, see <http://www.gnu.org/licenses/>
*
*/
#include <gnutls_int.h>
#include <algorithms.h>
#include <gnutls_errors.h>
#include <x509/common.h>
struct gnutls_hash_entry
{
const char *name;
const char *oid;
gnutls_mac_algorithm_t id;
size_t key_size; /* in case of mac */
unsigned placeholder; /* if set, then not a real MAC */
unsigned secure; /* if set the this algorithm is secure as hash */
};
typedef struct gnutls_hash_entry gnutls_hash_entry;
static const gnutls_hash_entry hash_algorithms[] = {
{"SHA1", HASH_OID_SHA1, GNUTLS_MAC_SHA1, 20, 0, 1},
{"MD5", HASH_OID_MD5, GNUTLS_MAC_MD5, 16, 0, 0},
{"SHA256", HASH_OID_SHA256, GNUTLS_MAC_SHA256, 32, 0, 1},
{"SHA384", HASH_OID_SHA384, GNUTLS_MAC_SHA384, 48, 0, 1},
{"SHA512", HASH_OID_SHA512, GNUTLS_MAC_SHA512, 64, 0, 1},
{"SHA224", HASH_OID_SHA224, GNUTLS_MAC_SHA224, 28, 0, 1},
{"AEAD", NULL, GNUTLS_MAC_AEAD, 0, 1, 1},
{"MD2", HASH_OID_MD2, GNUTLS_MAC_MD2, 0, 0, 0}, /* not used as MAC */
{"RIPEMD160", HASH_OID_RMD160, GNUTLS_MAC_RMD160, 20, 0, 1},
{"MAC-NULL", NULL, GNUTLS_MAC_NULL, 0, 0, 0},
{0, 0, 0, 0, 0}
};
#define GNUTLS_HASH_LOOP(b) \
const gnutls_hash_entry *p; \
for(p = hash_algorithms; p->name != NULL; p++) { b ; }
#define GNUTLS_HASH_ALG_LOOP(a) \
GNUTLS_HASH_LOOP( if(p->id == algorithm) { a; break; } )
int
_gnutls_mac_priority (gnutls_session_t session,
gnutls_mac_algorithm_t algorithm)
{ /* actually returns the priority */
unsigned int i;
for (i = 0; i < session->internals.priorities.mac.algorithms; i++)
{
if (session->internals.priorities.mac.priority[i] == algorithm)
return i;
}
return -1;
}
/**
* gnutls_mac_get_name:
* @algorithm: is a MAC algorithm
*
* Convert a #gnutls_mac_algorithm_t value to a string.
*
* Returns: a string that contains the name of the specified MAC
* algorithm, or %NULL.
**/
const char *
gnutls_mac_get_name (gnutls_mac_algorithm_t algorithm)
{
const char *ret = NULL;
/* avoid prefix */
GNUTLS_HASH_ALG_LOOP (ret = p->name);
return ret;
}
/**
* gnutls_mac_get_id:
* @name: is a MAC algorithm name
*
* Convert a string to a #gnutls_mac_algorithm_t value. The names are
* compared in a case insensitive way.
*
* Returns: a #gnutls_mac_algorithm_t id of the specified MAC
* algorithm string, or %GNUTLS_MAC_UNKNOWN on failures.
**/
gnutls_mac_algorithm_t
gnutls_mac_get_id (const char *name)
{
gnutls_mac_algorithm_t ret = GNUTLS_MAC_UNKNOWN;
GNUTLS_HASH_LOOP (
if (strcasecmp (p->name, name) == 0)
{
ret = p->id;
break;
}
);
return ret;
}
/**
* gnutls_mac_get_key_size:
* @algorithm: is an encryption algorithm
*
* Get size of MAC key.
*
* Returns: length (in bytes) of the given MAC key size, or 0 if the
* given MAC algorithm is invalid.
**/
size_t
gnutls_mac_get_key_size (gnutls_mac_algorithm_t algorithm)
{
size_t ret = 0;
/* avoid prefix */
GNUTLS_HASH_ALG_LOOP (ret = p->key_size);
return ret;
}
/**
* gnutls_mac_list:
*
* Get a list of hash algorithms for use as MACs. Note that not
* necessarily all MACs are supported in TLS cipher suites. For
* example, MD2 is not supported as a cipher suite, but is supported
* for other purposes (e.g., X.509 signature verification or similar).
*
* This function is not thread safe.
*
* Returns: Return a (0)-terminated list of #gnutls_mac_algorithm_t
* integers indicating the available MACs.
**/
const gnutls_mac_algorithm_t *
gnutls_mac_list (void)
{
static gnutls_mac_algorithm_t supported_macs[MAX_ALGOS] = { 0 };
if (supported_macs[0] == 0)
{
int i = 0;
GNUTLS_HASH_LOOP (
if (p->placeholder != 0 || _gnutls_hmac_exists(p->id))
supported_macs[i++]=p->id;
);
supported_macs[i++]=0;
}
return supported_macs;
}
const char *
_gnutls_x509_mac_to_oid (gnutls_mac_algorithm_t algorithm)
{
const char *ret = NULL;
/* avoid prefix */
GNUTLS_HASH_ALG_LOOP (ret = p->oid);
return ret;
}
gnutls_digest_algorithm_t
_gnutls_x509_oid_to_digest (const char *oid)
{
gnutls_digest_algorithm_t ret = 0;
GNUTLS_HASH_LOOP (if (p->oid && strcmp (oid, p->oid) == 0)
{
ret = (gnutls_digest_algorithm_t)p->id;
break;
}
);
if (ret == 0)
return GNUTLS_DIG_UNKNOWN;
return ret;
}
int
_gnutls_mac_is_ok (gnutls_mac_algorithm_t algorithm)
{
ssize_t ret = -1;
GNUTLS_HASH_ALG_LOOP (ret = p->id);
if (ret >= 0)
ret = 0;
else
ret = 1;
return ret;
}
int
_gnutls_digest_is_secure (gnutls_digest_algorithm_t algo)
{
ssize_t ret = 0;
gnutls_mac_algorithm_t algorithm = algo;
GNUTLS_HASH_ALG_LOOP (ret = p->secure);
return ret;
}
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