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/*
* $Id: random.c 216 2012-10-16 19:57:01Z aaron $
*/
/************************************************************************
* *
* Copyright (C) 2002 *
* Internet2 *
* All Rights Reserved *
* *
************************************************************************/
/*
* File: random.c
*
* Author: Anatoly Karp
* Jeff W. Boote
* Internet2
*
* Date: Sun Jun 02 11:50:52 MDT 2002
*
* Description:
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <I2util/utilP.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
struct I2RandomSourceRec{
I2ErrHandle eh;
int type;
int fd; /* used for I2RAND_DEV */
};
/*
** Initialize the source of random bytes. Possible types are:
** I2RAND_DEV - random device (eg, /dev/urandom or /dev/random) - <data>
** is then interpreted as char* pathname of the device.
** I2RAND_EGD - enthropy generating daemon (EGD) - <data> is
** then interpreted as char* pathname to the local socket the EGD daemon
** is listening on.
** Returns 0 on success, or -1 on failure.
*/
I2RandomSource
I2RandomSourceInit(I2ErrHandle eh, int type, void* data)
{
I2RandomSource rand_src;
if(!eh)
return NULL;
if( !(rand_src = malloc(sizeof(struct I2RandomSourceRec)))){
I2ErrLog(eh,"malloc():%M");
return NULL;
}
rand_src->eh = eh;
rand_src->type = type;
switch (type) {
case I2RAND_DEV:
if(!data)
data = I2_RANDOMDEV_PATH;
if( (rand_src->fd = open((char *)data, O_RDONLY))<0){
I2ErrLog(eh, "I2randomBytes:open():%M");
return NULL;
}
break;
case I2RAND_EGD:
I2ErrLog(eh,
"I2randomBytes: I2RAND_EGD not yet implemented");
free(rand_src);
return NULL;
/* UNREACHED */
default:
I2ErrLog(eh,
"I2randomBytes:unknown/unsupported random source type");
free(rand_src);
return NULL;
/* UNREACHED */
}
return rand_src;
}
/*
** This function generates <count> many random bytes and
** places them in the location pointed to by <ptr>. It is
** a responsibility of the caller to have allocated
** sufficient space. Returns 0 on success, and -1 on failure.
*/
int
I2RandomBytes(
I2RandomSource src,
unsigned char *ptr,
unsigned int count
)
{
if(!src)
return -1;
switch (src->type) {
case I2RAND_DEV:
if (I2Readn(src->fd, ptr, count) != (signed) count) {
I2ErrLog(src->eh,
"I2randomBytes: I2Readn() failed: %M");
return -1;
}
break;
case I2RAND_EGD:
default:
/* UNREACHED */
I2ErrLog(src->eh,
"I2randomBytes: unknown/unsupported random source type");
return -1;
}
return 0;
}
void
I2RandomSourceClose(
I2RandomSource src
)
{
if(!src)
return;
switch (src->type) {
case I2RAND_DEV:
close(src->fd);
break;
case I2RAND_EGD:
default:
/* UNREACHED */
I2ErrLog(src->eh,
"I2randomBytes: unknown/unsupported random source type");
}
free(src);
return;
}
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