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Annotation of embedaddon/strongswan/src/libstrongswan/crypto/signers/mac_signer.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (C) 2012 Tobias Brunner
                      3:  * Copyright (C) 2005-2008 Martin Willi
                      4:  * Copyright (C) 2005 Jan Hutter
                      5:  * HSR Hochschule fuer Technik Rapperswil
                      6:  *
                      7:  * This program is free software; you can redistribute it and/or modify it
                      8:  * under the terms of the GNU General Public License as published by the
                      9:  * Free Software Foundation; either version 2 of the License, or (at your
                     10:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
                     11:  *
                     12:  * This program is distributed in the hope that it will be useful, but
                     13:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
                     15:  * for more details.
                     16:  */
                     17: 
                     18: #include "mac_signer.h"
                     19: 
                     20: typedef struct private_signer_t private_signer_t;
                     21: 
                     22: /**
                     23:  * Private data of a mac_signer_t object.
                     24:  */
                     25: struct private_signer_t {
                     26: 
                     27:        /**
                     28:         * Public interface
                     29:         */
                     30:        signer_t public;
                     31: 
                     32:        /**
                     33:         * MAC to use
                     34:         */
                     35:        mac_t *mac;
                     36: 
                     37:        /**
                     38:         * Truncation of MAC output
                     39:         */
                     40:        size_t truncation;
                     41: };
                     42: 
                     43: METHOD(signer_t, get_signature, bool,
                     44:        private_signer_t *this, chunk_t data, uint8_t *buffer)
                     45: {
                     46:        if (buffer)
                     47:        {
                     48:                uint8_t mac[this->mac->get_mac_size(this->mac)];
                     49: 
                     50:                if (!this->mac->get_mac(this->mac, data, mac))
                     51:                {
                     52:                        return FALSE;
                     53:                }
                     54:                memcpy(buffer, mac, this->truncation);
                     55:                return TRUE;
                     56:        }
                     57:        return this->mac->get_mac(this->mac, data, NULL);
                     58: }
                     59: 
                     60: METHOD(signer_t, allocate_signature, bool,
                     61:        private_signer_t *this, chunk_t data, chunk_t *chunk)
                     62: {
                     63:        if (chunk)
                     64:        {
                     65:                uint8_t mac[this->mac->get_mac_size(this->mac)];
                     66: 
                     67:                if (!this->mac->get_mac(this->mac, data, mac))
                     68:                {
                     69:                        return FALSE;
                     70:                }
                     71:                *chunk = chunk_alloc(this->truncation);
                     72:                memcpy(chunk->ptr, mac, this->truncation);
                     73:                return TRUE;
                     74:        }
                     75:        return this->mac->get_mac(this->mac, data, NULL);
                     76: }
                     77: 
                     78: METHOD(signer_t, verify_signature, bool,
                     79:        private_signer_t *this, chunk_t data, chunk_t signature)
                     80: {
                     81:        uint8_t mac[this->mac->get_mac_size(this->mac)];
                     82: 
                     83:        if (signature.len != this->truncation)
                     84:        {
                     85:                return FALSE;
                     86:        }
                     87:        return this->mac->get_mac(this->mac, data, mac) &&
                     88:                   memeq_const(signature.ptr, mac, this->truncation);
                     89: }
                     90: 
                     91: METHOD(signer_t, get_key_size, size_t,
                     92:        private_signer_t *this)
                     93: {
                     94:        return this->mac->get_mac_size(this->mac);
                     95: }
                     96: 
                     97: METHOD(signer_t, get_block_size, size_t,
                     98:        private_signer_t *this)
                     99: {
                    100:        return this->truncation;
                    101: }
                    102: 
                    103: METHOD(signer_t, set_key, bool,
                    104:        private_signer_t *this, chunk_t key)
                    105: {
                    106:        return this->mac->set_key(this->mac, key);
                    107: }
                    108: 
                    109: METHOD(signer_t, destroy, void,
                    110:        private_signer_t *this)
                    111: {
                    112:        this->mac->destroy(this->mac);
                    113:        free(this);
                    114: }
                    115: 
                    116: /*
                    117:  * Described in header
                    118:  */
                    119: signer_t *mac_signer_create(mac_t *mac, size_t len)
                    120: {
                    121:        private_signer_t *this;
                    122: 
                    123:        INIT(this,
                    124:                .public = {
                    125:                        .get_signature = _get_signature,
                    126:                        .allocate_signature = _allocate_signature,
                    127:                        .verify_signature = _verify_signature,
                    128:                        .get_block_size = _get_block_size,
                    129:                        .get_key_size = _get_key_size,
                    130:                        .set_key = _set_key,
                    131:                        .destroy = _destroy,
                    132:                },
                    133:                .truncation = min(len, mac->get_mac_size(mac)),
                    134:                .mac = mac,
                    135:        );
                    136: 
                    137:        return &this->public;
                    138: }