95 lines
1.8 KiB
C
95 lines
1.8 KiB
C
/*
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* Copyright (C) 2017 Andreas Steffen
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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 "tpm_rng.h"
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#include <tpm_tss.h>
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#include <utils/debug.h>
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typedef struct private_tpm_rng_t private_tpm_rng_t;
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/**
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* Private data of an tpm_rng_t object.
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*/
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struct private_tpm_rng_t {
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/**
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* Public interface.
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*/
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tpm_rng_t public;
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/**
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* Trusted Platform Module
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*/
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tpm_tss_t *tpm;
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};
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METHOD(rng_t, get_bytes, bool,
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private_tpm_rng_t *this, size_t bytes, uint8_t *buffer)
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{
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return this->tpm->get_random(this->tpm, bytes, buffer);
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}
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METHOD(rng_t, allocate_bytes, bool,
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private_tpm_rng_t *this, size_t bytes, chunk_t *chunk)
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{
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*chunk = chunk_alloc(bytes);
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if (!get_bytes(this, chunk->len, chunk->ptr))
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{
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chunk_clear(chunk);
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return FALSE;
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}
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return TRUE;
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}
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METHOD(rng_t, destroy, void,
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private_tpm_rng_t *this)
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{
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this->tpm->destroy(this->tpm);
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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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tpm_rng_t *tpm_rng_create(rng_quality_t quality)
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{
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private_tpm_rng_t *this;
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tpm_tss_t *tpm;
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/* try to find a TPM 2.0 */
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tpm = tpm_tss_probe(TPM_VERSION_2_0);
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if (!tpm)
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{
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DBG1(DBG_LIB, "no TPM 2.0 found");
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return NULL;
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}
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INIT(this,
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.public = {
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.rng = {
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.get_bytes = _get_bytes,
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.allocate_bytes = _allocate_bytes,
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.destroy = _destroy,
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},
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},
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.tpm = tpm,
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);
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return &this->public;
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}
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