added API for random number generators, served through credential factory
ported randomizer_t to a rng_t on top of /dev/(u)random (plugin random)
This commit is contained in:
Martin Willi
@@ -1,150 +0,0 @@
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/*
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* Copyright (C) 2005-2006 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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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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* $Id$
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*/
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "randomizer.h"
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typedef struct private_randomizer_t private_randomizer_t;
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/**
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* Private data of an randomizer_t object.
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*/
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struct private_randomizer_t {
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/**
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* Public randomizer_t interface.
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*/
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randomizer_t public;
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};
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/**
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* Read bytes from the random device
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*/
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static status_t read_bytes(private_randomizer_t *this,
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bool pseudo_random, size_t bytes, u_int8_t *buffer)
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{
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size_t ndone;
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int device;
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size_t got;
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char * device_name;
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device_name = pseudo_random ? DEV_URANDOM : DEV_RANDOM;
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device = open(device_name, 0);
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if (device < 0) {
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return FAILED;
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}
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ndone = 0;
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/* read until nbytes are read */
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while (ndone < bytes)
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{
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got = read(device, buffer + ndone, bytes - ndone);
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if (got <= 0) {
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close(device);
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return FAILED;
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}
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ndone += got;
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}
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close(device);
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return SUCCESS;
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}
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/**
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* Implementation of randomizer_t.get_random_bytes.
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*/
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static status_t get_random_bytes(private_randomizer_t *this,size_t bytes,
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u_int8_t *buffer)
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{
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return read_bytes(this, FALSE, bytes, buffer);
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}
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/**
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* Implementation of randomizer_t.allocate_random_bytes.
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*/
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static status_t allocate_random_bytes(private_randomizer_t *this, size_t bytes,
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chunk_t *chunk)
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{
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status_t status;
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chunk->len = bytes;
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chunk->ptr = malloc(bytes);
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status = read_bytes(this, FALSE, bytes, chunk->ptr);
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if (status != SUCCESS)
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{
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free(chunk->ptr);
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}
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return status;
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}
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/**
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* Implementation of randomizer_t.get_pseudo_random_bytes.
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*/
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static status_t get_pseudo_random_bytes(private_randomizer_t *this,
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size_t bytes, u_int8_t *buffer)
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{
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return read_bytes(this, TRUE, bytes, buffer);
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}
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/**
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* Implementation of randomizer_t.allocate_pseudo_random_bytes.
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*/
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static status_t allocate_pseudo_random_bytes(private_randomizer_t *this,
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size_t bytes, chunk_t *chunk)
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{
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status_t status;
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chunk->len = bytes;
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chunk->ptr = malloc(bytes);
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status = read_bytes(this, TRUE, bytes, chunk->ptr);
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if (status != SUCCESS)
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{
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free(chunk->ptr);
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}
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return status;
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}
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/**
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* Implementation of randomizer_t.destroy.
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*/
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static void destroy(private_randomizer_t *this)
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{
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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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randomizer_t *randomizer_create(void)
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{
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private_randomizer_t *this = malloc_thing(private_randomizer_t);
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/* public functions */
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this->public.get_random_bytes = (status_t (*) (randomizer_t *,size_t, u_int8_t *)) get_random_bytes;
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this->public.allocate_random_bytes = (status_t (*) (randomizer_t *,size_t, chunk_t *)) allocate_random_bytes;
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this->public.get_pseudo_random_bytes = (status_t (*) (randomizer_t *,size_t, u_int8_t *)) get_pseudo_random_bytes;
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this->public.allocate_pseudo_random_bytes = (status_t (*) (randomizer_t *,size_t, chunk_t *)) allocate_pseudo_random_bytes;
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this->public.destroy = (void (*) (randomizer_t *))destroy;
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return &this->public;
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}
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@@ -1,101 +0,0 @@
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/*
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* Copyright (C) 2005-2006 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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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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* $Id$
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*/
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/**
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* @defgroup randomizer randomizer
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* @{ @ingroup utils
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*/
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#ifndef RANDOMIZER_H_
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#define RANDOMIZER_H_
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typedef struct randomizer_t randomizer_t;
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#include <library.h>
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#ifndef DEV_RANDOM
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/**
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* Device to read real random bytes
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*/
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# define DEV_RANDOM "/dev/random"
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#endif
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#ifndef DEV_URANDOM
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/**
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* Device to read pseudo random bytes
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*/
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# define DEV_URANDOM "/dev/urandom"
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#endif
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/**
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* Class used to get random and pseudo random values.
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*/
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struct randomizer_t {
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/**
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* Reads a specific number of bytes from random device.
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*
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* @param bytes number of bytes to read
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* @param buffer pointer to buffer where to write the data in.
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* @return SUCCESS, or FAILED
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*/
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status_t (*get_random_bytes) (randomizer_t *this,
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size_t bytes, u_int8_t *buffer);
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/**
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* Allocates space and writes in random bytes.
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*
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* @param bytes number of bytes to allocate
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* @param chunk chunk which will hold the allocated random bytes
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* @return SUCCESS, or FAILED
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*/
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status_t (*allocate_random_bytes) (randomizer_t *this,
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size_t bytes, chunk_t *chunk);
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/**
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* Reads a specific number of bytes from pseudo random device.
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*
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* @param bytes number of bytes to read
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* @param buffer pointer to buffer where to write the data in.
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* @return SUCCESS, or FAILED
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*/
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status_t (*get_pseudo_random_bytes) (randomizer_t *this,size_t bytes, u_int8_t *buffer);
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/**
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* Allocates space and writes in pseudo random bytes.
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*
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* @param bytes number of bytes to allocate
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* @param chunk chunk which will hold the allocated random bytes
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* @return SUCCESS, or FAILED
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*/
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status_t (*allocate_pseudo_random_bytes) (randomizer_t *this, size_t bytes, chunk_t *chunk);
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/**
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* Destroys a randomizer_t object.
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*/
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void (*destroy) (randomizer_t *this);
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};
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/**
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* Creates a randomizer_t object.
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*
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* @return created randomizer_t
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*/
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randomizer_t *randomizer_create(void);
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#endif /*RANDOMIZER_H_ @} */
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