139 lines
2.9 KiB
C
139 lines
2.9 KiB
C
/*
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* Copyright (C) 2012 Tobias Brunner
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* Copyright (C) 2005-2008 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "mac_signer.h"
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typedef struct private_signer_t private_signer_t;
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/**
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* Private data of a mac_signer_t object.
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*/
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struct private_signer_t {
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/**
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* Public interface
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*/
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signer_t public;
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/**
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* MAC to use
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*/
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mac_t *mac;
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/**
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* Truncation of MAC output
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*/
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size_t truncation;
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};
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METHOD(signer_t, get_signature, bool,
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private_signer_t *this, chunk_t data, uint8_t *buffer)
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{
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if (buffer)
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{
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uint8_t mac[this->mac->get_mac_size(this->mac)];
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if (!this->mac->get_mac(this->mac, data, mac))
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{
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return FALSE;
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}
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memcpy(buffer, mac, this->truncation);
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return TRUE;
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}
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return this->mac->get_mac(this->mac, data, NULL);
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}
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METHOD(signer_t, allocate_signature, bool,
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private_signer_t *this, chunk_t data, chunk_t *chunk)
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{
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if (chunk)
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{
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uint8_t mac[this->mac->get_mac_size(this->mac)];
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if (!this->mac->get_mac(this->mac, data, mac))
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{
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return FALSE;
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}
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*chunk = chunk_alloc(this->truncation);
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memcpy(chunk->ptr, mac, this->truncation);
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return TRUE;
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}
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return this->mac->get_mac(this->mac, data, NULL);
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}
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METHOD(signer_t, verify_signature, bool,
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private_signer_t *this, chunk_t data, chunk_t signature)
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{
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uint8_t mac[this->mac->get_mac_size(this->mac)];
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if (signature.len != this->truncation)
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{
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return FALSE;
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}
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return this->mac->get_mac(this->mac, data, mac) &&
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memeq_const(signature.ptr, mac, this->truncation);
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}
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METHOD(signer_t, get_key_size, size_t,
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private_signer_t *this)
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{
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return this->mac->get_mac_size(this->mac);
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}
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METHOD(signer_t, get_block_size, size_t,
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private_signer_t *this)
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{
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return this->truncation;
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}
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METHOD(signer_t, set_key, bool,
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private_signer_t *this, chunk_t key)
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{
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return this->mac->set_key(this->mac, key);
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}
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METHOD(signer_t, destroy, void,
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private_signer_t *this)
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{
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this->mac->destroy(this->mac);
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free(this);
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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 *mac_signer_create(mac_t *mac, size_t len)
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{
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private_signer_t *this;
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INIT(this,
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.public = {
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.get_signature = _get_signature,
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.allocate_signature = _allocate_signature,
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.verify_signature = _verify_signature,
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.get_block_size = _get_block_size,
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.get_key_size = _get_key_size,
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.set_key = _set_key,
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.destroy = _destroy,
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},
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.truncation = min(len, mac->get_mac_size(mac)),
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.mac = mac,
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);
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return &this->public;
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}
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