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Annotation of embedaddon/strongswan/src/libtpmtss/plugins/tpm/tpm_rng.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2017 Andreas Steffen
        !             3:  * HSR Hochschule fuer Technik Rapperswil
        !             4:  *
        !             5:  * This program is free software; you can redistribute it and/or modify it
        !             6:  * under the terms of the GNU General Public License as published by the
        !             7:  * Free Software Foundation; either version 2 of the License, or (at your
        !             8:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
        !             9:  *
        !            10:  * This program is distributed in the hope that it will be useful, but
        !            11:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            12:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
        !            13:  * for more details.
        !            14:  */
        !            15: 
        !            16: #include "tpm_rng.h"
        !            17: 
        !            18: #include <tpm_tss.h>
        !            19: #include <utils/debug.h>
        !            20: 
        !            21: typedef struct private_tpm_rng_t private_tpm_rng_t;
        !            22: 
        !            23: /**
        !            24:  * Private data of an tpm_rng_t object.
        !            25:  */
        !            26: struct private_tpm_rng_t {
        !            27: 
        !            28:        /**
        !            29:         * Public interface.
        !            30:         */
        !            31:        tpm_rng_t public;
        !            32: 
        !            33:        /**
        !            34:         * Trusted Platform Module
        !            35:         */
        !            36:        tpm_tss_t *tpm;
        !            37: 
        !            38: };
        !            39: 
        !            40: METHOD(rng_t, get_bytes, bool,
        !            41:        private_tpm_rng_t *this, size_t bytes, uint8_t *buffer)
        !            42: {
        !            43:        return this->tpm->get_random(this->tpm, bytes, buffer);
        !            44: }
        !            45: 
        !            46: METHOD(rng_t, allocate_bytes, bool,
        !            47:        private_tpm_rng_t *this, size_t bytes, chunk_t *chunk)
        !            48: {
        !            49:        *chunk = chunk_alloc(bytes);
        !            50:        if (!get_bytes(this, chunk->len, chunk->ptr))
        !            51:        {
        !            52:                chunk_clear(chunk);
        !            53:                return FALSE;
        !            54:        }
        !            55:        return TRUE;
        !            56: }
        !            57: 
        !            58: METHOD(rng_t, destroy, void,
        !            59:        private_tpm_rng_t *this)
        !            60: {
        !            61:        this->tpm->destroy(this->tpm);
        !            62:        free(this);
        !            63: }
        !            64: 
        !            65: /*
        !            66:  * Described in header.
        !            67:  */
        !            68: tpm_rng_t *tpm_rng_create(rng_quality_t quality)
        !            69: {
        !            70:        private_tpm_rng_t *this;
        !            71:        tpm_tss_t *tpm;
        !            72: 
        !            73:        /* try to find a TPM 2.0 */
        !            74:        tpm = tpm_tss_probe(TPM_VERSION_2_0);
        !            75:        if (!tpm)
        !            76:        {
        !            77:                DBG1(DBG_LIB, "no TPM 2.0 found");
        !            78:                return NULL;
        !            79:        }
        !            80: 
        !            81:        INIT(this,
        !            82:                .public = {
        !            83:                        .rng = {
        !            84:                                .get_bytes = _get_bytes,
        !            85:                                .allocate_bytes = _allocate_bytes,
        !            86:                                .destroy = _destroy,
        !            87:                        },
        !            88:                },
        !            89:                .tpm = tpm,
        !            90:        );
        !            91: 
        !            92:        return &this->public;
        !            93: }
        !            94: