144 lines
2.8 KiB
C
144 lines
2.8 KiB
C
/*
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* Copyright (C) 2011 Tobias Brunner
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* 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 "pkcs11_rng.h"
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#include <utils/debug.h>
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#include "pkcs11_manager.h"
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typedef struct private_pkcs11_rng_t private_pkcs11_rng_t;
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/**
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* Private data of an pkcs11_rng_t object.
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*/
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struct private_pkcs11_rng_t {
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/**
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* Public interface.
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*/
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pkcs11_rng_t public;
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/**
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* PKCS#11 library
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*/
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pkcs11_library_t *lib;
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/**
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* Mechanism for this rng
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*/
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CK_SESSION_HANDLE session;
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};
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METHOD(rng_t, get_bytes, bool,
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private_pkcs11_rng_t *this, size_t bytes, u_int8_t *buffer)
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{
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CK_RV rv;
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rv = this->lib->f->C_GenerateRandom(this->session, buffer, bytes);
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if (rv != CKR_OK)
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{
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DBG1(DBG_CFG, "C_GenerateRandom() failed: %N", ck_rv_names, rv);
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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, allocate_bytes, bool,
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private_pkcs11_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_pkcs11_rng_t *this)
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{
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this->lib->f->C_CloseSession(this->session);
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free(this);
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}
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/**
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* Find a token with its own RNG
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*/
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static pkcs11_library_t *find_token(CK_SESSION_HANDLE *session)
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{
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enumerator_t *tokens;
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pkcs11_manager_t *manager;
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pkcs11_library_t *current, *found = NULL;
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CK_SLOT_ID slot;
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manager = lib->get(lib, "pkcs11-manager");
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if (!manager)
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{
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return NULL;
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}
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tokens = manager->create_token_enumerator(manager);
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while (tokens->enumerate(tokens, ¤t, &slot))
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{
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CK_TOKEN_INFO info;
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CK_RV rv;
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rv = current->f->C_GetTokenInfo(slot, &info);
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if (rv != CKR_OK)
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{
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continue;
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}
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if (info.flags & CKF_RNG)
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{
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if (current->f->C_OpenSession(slot, CKF_SERIAL_SESSION,
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NULL, NULL, session) == CKR_OK)
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{
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found = current;
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break;
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}
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}
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}
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tokens->destroy(tokens);
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return found;
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}
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/*
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* Described in header.
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*/
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pkcs11_rng_t *pkcs11_rng_create(rng_quality_t quality)
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{
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private_pkcs11_rng_t *this;
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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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);
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this->lib = find_token(&this->session);
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if (!this->lib)
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{
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free(this);
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return NULL;
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}
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return &this->public;
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}
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