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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/botan/botan_hmac.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2018 René Korthaus
        !             3:  * Rohde & Schwarz Cybersecurity GmbH
        !             4:  *
        !             5:  * Permission is hereby granted, free of charge, to any person obtaining a copy
        !             6:  * of this software and associated documentation files (the "Software"), to deal
        !             7:  * in the Software without restriction, including without limitation the rights
        !             8:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        !             9:  * copies of the Software, and to permit persons to whom the Software is
        !            10:  * furnished to do so, subject to the following conditions:
        !            11:  *
        !            12:  * The above copyright notice and this permission notice shall be included in
        !            13:  * all copies or substantial portions of the Software.
        !            14:  *
        !            15:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            16:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            17:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
        !            18:  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            19:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        !            20:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        !            21:  * THE SOFTWARE.
        !            22:  */
        !            23: 
        !            24: #include "botan_hmac.h"
        !            25: 
        !            26: #include <botan/build.h>
        !            27: 
        !            28: #ifdef BOTAN_HAS_HMAC
        !            29: 
        !            30: #include <crypto/mac.h>
        !            31: #include <crypto/prfs/mac_prf.h>
        !            32: #include <crypto/signers/mac_signer.h>
        !            33: 
        !            34: #include <botan/ffi.h>
        !            35: 
        !            36: typedef struct private_botan_mac_t private_botan_mac_t;
        !            37: 
        !            38: /**
        !            39:  * Private data of a mac_t object.
        !            40:  */
        !            41: struct private_botan_mac_t {
        !            42: 
        !            43:        /**
        !            44:         * Public interface
        !            45:         */
        !            46:        mac_t public;
        !            47: 
        !            48:        /**
        !            49:         * HMAC
        !            50:         */
        !            51:        botan_mac_t hmac;
        !            52: };
        !            53: 
        !            54: METHOD(mac_t, set_key, bool,
        !            55:        private_botan_mac_t *this, chunk_t key)
        !            56: {
        !            57:        if (botan_mac_set_key(this->hmac, key.ptr, key.len))
        !            58:        {
        !            59:                return FALSE;
        !            60:        }
        !            61:        return TRUE;
        !            62: }
        !            63: 
        !            64: METHOD(mac_t, get_mac, bool,
        !            65:        private_botan_mac_t *this, chunk_t data, uint8_t *out)
        !            66: {
        !            67:        if (botan_mac_update(this->hmac, data.ptr, data.len))
        !            68:        {
        !            69:                return FALSE;
        !            70:        }
        !            71: 
        !            72:        if (out && botan_mac_final(this->hmac, out))
        !            73:        {
        !            74:                return FALSE;
        !            75:        }
        !            76:        return TRUE;
        !            77: }
        !            78: 
        !            79: METHOD(mac_t, get_mac_size, size_t,
        !            80:        private_botan_mac_t *this)
        !            81: {
        !            82:        size_t len = 0;
        !            83: 
        !            84:        if (botan_mac_output_length(this->hmac, &len))
        !            85:        {
        !            86:                return 0;
        !            87:        }
        !            88:        return len;
        !            89: }
        !            90: 
        !            91: METHOD(mac_t, destroy, void,
        !            92:        private_botan_mac_t *this)
        !            93: {
        !            94:        botan_mac_destroy(this->hmac);
        !            95:        free(this);
        !            96: }
        !            97: 
        !            98: /*
        !            99:  * Create a Botan-backed implementation of the mac_t interface
        !           100:  */
        !           101: static mac_t *hmac_create(hash_algorithm_t algo)
        !           102: {
        !           103:        private_botan_mac_t *this;
        !           104:        const char* hmac_name;
        !           105: 
        !           106:        switch (algo)
        !           107:        {
        !           108:                case HASH_SHA1:
        !           109:                        hmac_name = "HMAC(SHA-1)";
        !           110:                        break;
        !           111:                case HASH_SHA256:
        !           112:                        hmac_name = "HMAC(SHA-256)";
        !           113:                        break;
        !           114:                case HASH_SHA384:
        !           115:                        hmac_name = "HMAC(SHA-384)";
        !           116:                        break;
        !           117:                case HASH_SHA512:
        !           118:                        hmac_name = "HMAC(SHA-512)";
        !           119:                        break;
        !           120:                default:
        !           121:                        return NULL;
        !           122:        }
        !           123: 
        !           124:        INIT(this,
        !           125:                .public = {
        !           126:                        .get_mac = _get_mac,
        !           127:                        .get_mac_size = _get_mac_size,
        !           128:                        .set_key = _set_key,
        !           129:                        .destroy = _destroy,
        !           130:                }
        !           131:        );
        !           132: 
        !           133:        if (botan_mac_init(&this->hmac, hmac_name, 0))
        !           134:        {
        !           135:                free(this);
        !           136:                return NULL;
        !           137:        }
        !           138:        return &this->public;
        !           139: }
        !           140: 
        !           141: /*
        !           142:  * Described in header
        !           143:  */
        !           144: prf_t *botan_hmac_prf_create(pseudo_random_function_t algo)
        !           145: {
        !           146:        mac_t *hmac;
        !           147: 
        !           148:        hmac = hmac_create(hasher_algorithm_from_prf(algo));
        !           149:        if (hmac)
        !           150:        {
        !           151:                return mac_prf_create(hmac);
        !           152:        }
        !           153:        return NULL;
        !           154: }
        !           155: 
        !           156: /*
        !           157:  * Described in header
        !           158:  */
        !           159: signer_t *botan_hmac_signer_create(integrity_algorithm_t algo)
        !           160: {
        !           161:        mac_t *hmac;
        !           162:        size_t trunc;
        !           163: 
        !           164:        hmac = hmac_create(hasher_algorithm_from_integrity(algo, &trunc));
        !           165:        if (hmac)
        !           166:        {
        !           167:                return mac_signer_create(hmac, trunc);
        !           168:        }
        !           169:        return NULL;
        !           170: }
        !           171: 
        !           172: #endif