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/*
* Copyright (C) 2017 Red Hat, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS 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.
*
* 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 <https://www.gnu.org/licenses/>
*
*/
#include <gnutls_int.h>
#include "int/tls1-prf.h"
#include <nettle/hmac.h>
/*-
* _gnutls_prf_raw:
* @mac: the MAC algorithm to use, set to %GNUTLS_MAC_MD5_SHA1 for the TLS1.0 mac
* @master_size: length of the @master variable.
* @master: the master secret used in PRF computation
* @label_size: length of the @label variable.
* @label: label used in PRF computation, typically a short string.
* @seed_size: length of the @seed variable.
* @seed: optional extra data to seed the PRF with.
* @outsize: size of pre-allocated output buffer to hold the output.
* @out: pre-allocated buffer to hold the generated data.
*
* Apply the TLS Pseudo-Random-Function (PRF) on the master secret
* and the provided data.
*
* Returns: %GNUTLS_E_SUCCESS on success, or an error code.
-*/
int
_gnutls_prf_raw(gnutls_mac_algorithm_t mac,
size_t master_size, const void *master,
size_t label_size, const char *label,
size_t seed_size, const uint8_t *seed, size_t outsize, char *out)
{
int ret;
switch (mac) {
case GNUTLS_MAC_MD5_SHA1:
tls10_prf(master_size, (uint8_t*)master, label_size, label,
seed_size, seed, outsize, (uint8_t*)out);
return 0;
case GNUTLS_MAC_SHA256:{
struct hmac_sha256_ctx ctx;
hmac_sha256_set_key(&ctx, master_size, (uint8_t*)master);
ret = tls12_prf(&ctx,
(nettle_hash_update_func *)
hmac_sha256_update,
(nettle_hash_digest_func *)
hmac_sha256_digest, SHA256_DIGEST_SIZE,
label_size, label, seed_size,
seed, outsize,
(uint8_t*)out);
if (unlikely(ret != 1))
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
break;
}
case GNUTLS_MAC_SHA384:{
struct hmac_sha384_ctx ctx;
hmac_sha384_set_key(&ctx, master_size, master);
ret = tls12_prf(&ctx,
(nettle_hash_update_func *)
hmac_sha384_update,
(nettle_hash_digest_func *)
hmac_sha384_digest, SHA384_DIGEST_SIZE,
label_size, label, seed_size,
seed, outsize,
(uint8_t*)out);
if (unlikely(ret != 1))
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
break;
}
default:
gnutls_assert();
_gnutls_debug_log("unhandled PRF %s\n",
gnutls_mac_get_name(mac));
return GNUTLS_E_INVALID_REQUEST;
}
return 0;
}
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