173 lines
3.4 KiB
C
173 lines
3.4 KiB
C
/*
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* Copyright (C) 2018 René Korthaus
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* Rohde & Schwarz Cybersecurity GmbH
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "botan_hmac.h"
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#include <botan/build.h>
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#ifdef BOTAN_HAS_HMAC
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#include <crypto/mac.h>
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#include <crypto/prfs/mac_prf.h>
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#include <crypto/signers/mac_signer.h>
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#include <botan/ffi.h>
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typedef struct private_botan_mac_t private_botan_mac_t;
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/**
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* Private data of a mac_t object.
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*/
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struct private_botan_mac_t {
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/**
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* Public interface
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*/
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mac_t public;
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/**
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* HMAC
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*/
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botan_mac_t hmac;
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};
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METHOD(mac_t, set_key, bool,
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private_botan_mac_t *this, chunk_t key)
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{
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if (botan_mac_set_key(this->hmac, key.ptr, key.len))
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{
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return FALSE;
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}
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return TRUE;
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}
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METHOD(mac_t, get_mac, bool,
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private_botan_mac_t *this, chunk_t data, uint8_t *out)
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{
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if (botan_mac_update(this->hmac, data.ptr, data.len))
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{
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return FALSE;
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}
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if (out && botan_mac_final(this->hmac, out))
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{
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return FALSE;
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}
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return TRUE;
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}
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METHOD(mac_t, get_mac_size, size_t,
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private_botan_mac_t *this)
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{
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size_t len = 0;
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if (botan_mac_output_length(this->hmac, &len))
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{
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return 0;
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}
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return len;
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}
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METHOD(mac_t, destroy, void,
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private_botan_mac_t *this)
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{
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botan_mac_destroy(this->hmac);
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free(this);
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}
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/*
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* Create a Botan-backed implementation of the mac_t interface
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*/
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static mac_t *hmac_create(hash_algorithm_t algo)
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{
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private_botan_mac_t *this;
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const char* hmac_name;
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switch (algo)
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{
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case HASH_SHA1:
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hmac_name = "HMAC(SHA-1)";
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break;
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case HASH_SHA256:
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hmac_name = "HMAC(SHA-256)";
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break;
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case HASH_SHA384:
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hmac_name = "HMAC(SHA-384)";
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break;
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case HASH_SHA512:
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hmac_name = "HMAC(SHA-512)";
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break;
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default:
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return NULL;
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}
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INIT(this,
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.public = {
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.get_mac = _get_mac,
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.get_mac_size = _get_mac_size,
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.set_key = _set_key,
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.destroy = _destroy,
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}
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);
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if (botan_mac_init(&this->hmac, hmac_name, 0))
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{
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free(this);
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return NULL;
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}
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return &this->public;
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}
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/*
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* Described in header
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*/
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prf_t *botan_hmac_prf_create(pseudo_random_function_t algo)
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{
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mac_t *hmac;
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hmac = hmac_create(hasher_algorithm_from_prf(algo));
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if (hmac)
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{
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return mac_prf_create(hmac);
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}
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return NULL;
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}
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/*
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* Described in header
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*/
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signer_t *botan_hmac_signer_create(integrity_algorithm_t algo)
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{
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mac_t *hmac;
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size_t trunc;
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hmac = hmac_create(hasher_algorithm_from_integrity(algo, &trunc));
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if (hmac)
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{
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return mac_signer_create(hmac, trunc);
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}
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return NULL;
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}
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#endif
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