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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/wolfssl/wolfssl_hmac.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2019 Sean Parkinson, wolfSSL Inc.
        !             3:  *
        !             4:  * Permission is hereby granted, free of charge, to any person obtaining a copy
        !             5:  * of this software and associated documentation files (the "Software"), to deal
        !             6:  * in the Software without restriction, including without limitation the rights
        !             7:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        !             8:  * copies of the Software, and to permit persons to whom the Software is
        !             9:  * furnished to do so, subject to the following conditions:
        !            10:  *
        !            11:  * The above copyright notice and this permission notice shall be included in
        !            12:  * all copies or substantial portions of the Software.
        !            13:  *
        !            14:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            15:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
        !            17:  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            18:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        !            19:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        !            20:  * THE SOFTWARE.
        !            21:  */
        !            22: 
        !            23: #include "wolfssl_common.h"
        !            24: 
        !            25: #ifndef NO_HMAC
        !            26: 
        !            27: #include <wolfssl/wolfcrypt/hmac.h>
        !            28: 
        !            29: #include "wolfssl_hmac.h"
        !            30: #include "wolfssl_util.h"
        !            31: 
        !            32: #include <crypto/mac.h>
        !            33: #include <crypto/prfs/mac_prf.h>
        !            34: #include <crypto/signers/mac_signer.h>
        !            35: 
        !            36: typedef struct private_mac_t private_mac_t;
        !            37: 
        !            38: /**
        !            39:  * Private data of a mac_t object.
        !            40:  */
        !            41: struct private_mac_t {
        !            42: 
        !            43:        /**
        !            44:         * Public interface
        !            45:         */
        !            46:        mac_t public;
        !            47: 
        !            48:        /**
        !            49:         * Current HMAC
        !            50:         */
        !            51:        Hmac hmac;
        !            52: 
        !            53:        /**
        !            54:         * Hasher to use
        !            55:         */
        !            56:        enum wc_HashType type;
        !            57: 
        !            58:        /**
        !            59:         * Key set on Hmac?
        !            60:         */
        !            61:        bool key_set;
        !            62: };
        !            63: 
        !            64: METHOD(mac_t, set_key, bool,
        !            65:        private_mac_t *this, chunk_t key)
        !            66: {
        !            67:        int ret = wc_HmacSetKey(&this->hmac, this->type, key.ptr, key.len);
        !            68:        this->key_set = (ret == 0);
        !            69:        return ret == 0;
        !            70: }
        !            71: 
        !            72: METHOD(mac_t, get_mac, bool,
        !            73:        private_mac_t *this, chunk_t data, uint8_t *out)
        !            74: {
        !            75:        int ret = -1;
        !            76: 
        !            77:        if (this->key_set)
        !            78:        {
        !            79:                ret = wc_HmacUpdate(&this->hmac, data.ptr, data.len);
        !            80:                if (ret == 0 && out)
        !            81:                {
        !            82:                        ret = wc_HmacFinal(&this->hmac, out);
        !            83:                }
        !            84:        }
        !            85:        return ret == 0;
        !            86: }
        !            87: 
        !            88: METHOD(mac_t, get_mac_size, size_t,
        !            89:        private_mac_t *this)
        !            90: {
        !            91:        return wc_HmacSizeByType(this->type);
        !            92: }
        !            93: 
        !            94: METHOD(mac_t, destroy, void,
        !            95:        private_mac_t *this)
        !            96: {
        !            97:        wc_HmacFree(&this->hmac);
        !            98:        free(this);
        !            99: }
        !           100: 
        !           101: /*
        !           102:  * Create an wolfSSL-backed implementation of the mac_t interface
        !           103:  */
        !           104: static mac_t *hmac_create(hash_algorithm_t algo)
        !           105: {
        !           106:        private_mac_t *this;
        !           107:        enum wc_HashType type;
        !           108: 
        !           109:        if (!wolfssl_hash2type(algo, &type))
        !           110:        {
        !           111:                return NULL;
        !           112:        }
        !           113: 
        !           114:        INIT(this,
        !           115:                .public = {
        !           116:                        .get_mac = _get_mac,
        !           117:                        .get_mac_size = _get_mac_size,
        !           118:                        .set_key = _set_key,
        !           119:                        .destroy = _destroy,
        !           120:                },
        !           121:                .type = type,
        !           122:        );
        !           123: 
        !           124:        if (wc_HmacInit(&this->hmac, NULL, INVALID_DEVID) != 0)
        !           125:        {
        !           126:                DBG1(DBG_LIB, "HMAC init failed, hmac create failed\n");
        !           127:                free(this);
        !           128:                return NULL;
        !           129:        }
        !           130:        return &this->public;
        !           131: }
        !           132: 
        !           133: /*
        !           134:  * Described in header
        !           135:  */
        !           136: prf_t *wolfssl_hmac_prf_create(pseudo_random_function_t algo)
        !           137: {
        !           138:        mac_t *hmac;
        !           139: 
        !           140:        hmac = hmac_create(hasher_algorithm_from_prf(algo));
        !           141:        if (hmac)
        !           142:        {
        !           143:                return mac_prf_create(hmac);
        !           144:        }
        !           145:        return NULL;
        !           146: }
        !           147: 
        !           148: /*
        !           149:  * Described in header
        !           150:  */
        !           151: signer_t *wolfssl_hmac_signer_create(integrity_algorithm_t algo)
        !           152: {
        !           153:        mac_t *hmac;
        !           154:        size_t trunc;
        !           155: 
        !           156:        hmac = hmac_create(hasher_algorithm_from_integrity(algo, &trunc));
        !           157:        if (hmac)
        !           158:        {
        !           159:                return mac_signer_create(hmac, trunc);
        !           160:        }
        !           161:        return NULL;
        !           162: }
        !           163: 
        !           164: #endif /* NO_HMAC */