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/*
* Copyright (C) 2011 Tobias Brunner
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "pkcs11_rng.h"
#include <utils/debug.h>
#include "pkcs11_manager.h"
typedef struct private_pkcs11_rng_t private_pkcs11_rng_t;
/**
* Private data of an pkcs11_rng_t object.
*/
struct private_pkcs11_rng_t {
/**
* Public interface.
*/
pkcs11_rng_t public;
/**
* PKCS#11 library
*/
pkcs11_library_t *lib;
/**
* Mechanism for this rng
*/
CK_SESSION_HANDLE session;
};
METHOD(rng_t, get_bytes, bool,
private_pkcs11_rng_t *this, size_t bytes, uint8_t *buffer)
{
CK_RV rv;
rv = this->lib->f->C_GenerateRandom(this->session, buffer, bytes);
if (rv != CKR_OK)
{
DBG1(DBG_CFG, "C_GenerateRandom() failed: %N", ck_rv_names, rv);
return FALSE;
}
return TRUE;
}
METHOD(rng_t, allocate_bytes, bool,
private_pkcs11_rng_t *this, size_t bytes, chunk_t *chunk)
{
*chunk = chunk_alloc(bytes);
if (!get_bytes(this, chunk->len, chunk->ptr))
{
chunk_clear(chunk);
return FALSE;
}
return TRUE;
}
METHOD(rng_t, destroy, void,
private_pkcs11_rng_t *this)
{
this->lib->f->C_CloseSession(this->session);
free(this);
}
/**
* Find a token with its own RNG
*/
static pkcs11_library_t *find_token(CK_SESSION_HANDLE *session)
{
enumerator_t *tokens;
pkcs11_manager_t *manager;
pkcs11_library_t *current, *found = NULL;
CK_SLOT_ID slot;
manager = lib->get(lib, "pkcs11-manager");
if (!manager)
{
return NULL;
}
tokens = manager->create_token_enumerator(manager);
while (tokens->enumerate(tokens, ¤t, &slot))
{
CK_TOKEN_INFO info;
CK_RV rv;
rv = current->f->C_GetTokenInfo(slot, &info);
if (rv != CKR_OK)
{
continue;
}
if (info.flags & CKF_RNG)
{
if (current->f->C_OpenSession(slot, CKF_SERIAL_SESSION,
NULL, NULL, session) == CKR_OK)
{
found = current;
break;
}
}
}
tokens->destroy(tokens);
return found;
}
/*
* Described in header.
*/
pkcs11_rng_t *pkcs11_rng_create(rng_quality_t quality)
{
private_pkcs11_rng_t *this;
INIT(this,
.public = {
.rng = {
.get_bytes = _get_bytes,
.allocate_bytes = _allocate_bytes,
.destroy = _destroy,
},
},
);
this->lib = find_token(&this->session);
if (!this->lib)
{
free(this);
return NULL;
}
return &this->public;
}
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