- randomizer_t written and tested
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Source/charon/utils/randomizer.c
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Source/charon/utils/randomizer.c
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/**
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* @file randomizer.c
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*
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* @brief Class used to get random and pseudo random values
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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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 <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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#include "allocator.h"
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/**
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* Default random device used when no device is given.
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*/
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#define DEFAULT_RANDOM_DEVICE "/dev/random"
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/**
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* Pseudo random device used when no device is given.
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*/
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#define DEFAULT_PSEUDO_RANDOM_DEVICE "/dev/urandom"
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typedef struct private_randomizer_s private_randomizer_t;
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struct private_randomizer_s {
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/**
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* public interface
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*/
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randomizer_t public;
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/**
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* @brief Reads a specific number of bytes from random or pseudo random device
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*
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* @param pseudo_random TRUE, if pseudo random bytes should be read,
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* FALSE for true random bytes
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* @param bytes Number of bytes to read
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* @param[out] buffer Pointer to buffer where to write the data in.
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* Size of buffer has to be at least bytes.
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* @return
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* - SUCCESS
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* - FAILED
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*/
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status_t (*get_bytes_from_device) (private_randomizer_t *this,bool pseudo_random, size_t bytes, u_int8_t *buffer);
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/**
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* Random device name
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*/
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char *random_dev_name;
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/**
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* Pseudo random device name
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*/
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char *pseudo_random_dev_name;
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};
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/**
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* Implements private_randomizer_t's get_bytes_from_device function.
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* See #private_randomizer_t.get_bytes_from_device for description.
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*/
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static status_t get_bytes_from_device(private_randomizer_t *this,bool pseudo_random, size_t bytes, u_int8_t *buffer)
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{
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/* number of bytes already done */
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size_t ndone;
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/* device file descriptor */
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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) ? this->pseudo_random_dev_name : this->random_dev_name;
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// open device
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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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return FAILED;
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}
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if (got == 0) {
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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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close(device);
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return SUCCESS;
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}
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/**
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* Implements randomizer_t's get_random_bytes function.
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* See #randomizer_t.get_random_bytes for description.
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*/
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static status_t get_random_bytes(private_randomizer_t *this,size_t bytes, u_int8_t *buffer)
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{
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return (this->get_bytes_from_device(this, FALSE, bytes, buffer));
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}
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/**
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* Implements randomizer_t's get_pseudo_random_bytes function.
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* See #randomizer_t.get_pseudo_random_bytes for description.
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*/
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static status_t get_pseudo_random_bytes(private_randomizer_t *this,size_t bytes, u_int8_t *buffer)
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{
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return (this->get_bytes_from_device(this, TRUE, bytes, buffer));
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}
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/**
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* Implements randomizer_t's destroy function.
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* See #randomizer_t.destroy for description.
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*/
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static status_t destroy(private_randomizer_t *this)
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{
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allocator_free(this->random_dev_name);
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allocator_free(this->pseudo_random_dev_name);
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allocator_free(this);
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return SUCCESS;
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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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return randomizer_create_on_devices(DEFAULT_RANDOM_DEVICE,DEFAULT_PSEUDO_RANDOM_DEVICE);
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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_on_devices(char * random_dev_name,char * prandom_dev_name)
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{
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private_randomizer_t *this = allocator_alloc_thing(private_randomizer_t);
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if (this == NULL)
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{
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return NULL;
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}
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if ((random_dev_name == NULL) || (prandom_dev_name == NULL))
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{
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return NULL;
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}
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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.get_pseudo_random_bytes = (status_t (*) (randomizer_t *,size_t, u_int8_t *)) get_pseudo_random_bytes;
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this->public.destroy = (status_t (*) (randomizer_t *))destroy;
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/* private functions */
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this->get_bytes_from_device = get_bytes_from_device;
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/* private fields */
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this->random_dev_name = allocator_alloc(strlen(random_dev_name) + 1);
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if (this->random_dev_name == NULL)
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{
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allocator_free(this);
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return NULL;
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}
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strcpy(this->random_dev_name,random_dev_name);
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this->pseudo_random_dev_name = allocator_alloc(strlen(prandom_dev_name) + 1);
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if (this->pseudo_random_dev_name == NULL)
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{
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allocator_free(this->random_dev_name);
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allocator_free(this);
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return NULL;
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}
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strcpy(this->pseudo_random_dev_name,prandom_dev_name);
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return &(this->public);
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}
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94
Source/charon/utils/randomizer.h
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94
Source/charon/utils/randomizer.h
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/**
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* @file randomizer.h
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*
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* @brief Class used to get random and pseudo random values
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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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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#ifndef RANDOMIZER_H_
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#define RANDOMIZER_H_
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#include "../types.h"
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/**
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* Object representing an randomizer
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*
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* This class is thread save as file system read calls are thread save...
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*/
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typedef struct randomizer_s randomizer_t;
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struct randomizer_s {
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/**
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* @brief Reads a specific number of bytes from random device.
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*
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* @param this calling randomizer_t object
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* @param bytes Number of bytes to read
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* @param[out] buffer Pointer to buffer where to write the data in.
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* Size of buffer has to be at least bytes.
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* @return
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* - SUCCESS
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* - FAILED
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*/
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status_t (*get_random_bytes) (randomizer_t *this,size_t bytes, u_int8_t *buffer);
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/**
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* @brief Reads a specific number of bytes from pseudo random device.
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*
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* @param this calling randomizer_t object
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* @param bytes Number of bytes to read
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* @param[out] buffer Pointer to buffer where to write the data in.
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* Size of buffer has to be at least bytes.
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* @return
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* - SUCCESS
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* - 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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* @brief Destroys a randomizer_t object.
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*
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* @param this randomizer_t object to destroy
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* @return
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* SUCCESS in any case
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*/
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status_t (*destroy) (randomizer_t *this);
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};
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/**
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* @brief Create an randomizer_t object
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*
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* @return
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* - created randomizer_t, or
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* - NULL if failed
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*/
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randomizer_t *randomizer_create();
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/**
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* @brief Create an randomizer_t object with specific random device names
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*
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* @param random_dev_name Device name for random values, etc /dev/random
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* @param prandom_dev_name Device name for pseudo random values, etc /dev/urandom
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* @return
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* - created randomizer_t, or
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* - NULL if failed
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*/
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randomizer_t *randomizer_create_on_devices(char * random_dev_name,char * prandom_dev_name);
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#endif /*RANDOMIZER_H_*/
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