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/* random.c
*
* Copyright (C) 2006-2011 Sawtooth Consulting Ltd.
*
* This file is part of CyaSSL.
*
* CyaSSL 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.
*
* CyaSSL 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
/* on HPUX 11 you may need to install /dev/random see
http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=KRNG11I
*/
#include "random.h"
#include "error.h"
#if defined(USE_WINDOWS_API)
#define _WIN32_WINNT 0x0400
#include <windows.h>
#include <wincrypt.h>
#else
#ifndef NO_DEV_RANDOM
#include <fcntl.h>
#include <unistd.h>
#else
/* include headers that may be needed to get good seed */
#endif
#endif /* USE_WINDOWS_API */
/* Get seed and key cipher */
int InitRng(RNG* rng)
{
byte key[32];
byte junk[256];
int ret = GenerateSeed(&rng->seed, key, sizeof(key));
if (ret == 0) {
Arc4SetKey(&rng->cipher, key, sizeof(key));
RNG_GenerateBlock(rng, junk, sizeof(junk)); /* rid initial state */
}
return ret;
}
/* place a generated block in output */
void RNG_GenerateBlock(RNG* rng, byte* output, word32 sz)
{
XMEMSET(output, 0, sz);
Arc4Process(&rng->cipher, output, output, sz);
}
byte RNG_GenerateByte(RNG* rng)
{
byte b;
RNG_GenerateBlock(rng, &b, 1);
return b;
}
#if defined(USE_WINDOWS_API)
int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
{
if(!CryptAcquireContext(&os->handle, 0, 0, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT))
return WINCRYPT_E;
if (!CryptGenRandom(os->handle, sz, output))
return CRYPTGEN_E;
CryptReleaseContext(os->handle, 0);
return 0;
}
#elif defined(THREADX)
#include "rtprand.h" /* rtp_rand () */
#include "rtptime.h" /* rtp_get_system_msec() */
int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
{
int i;
rtp_srand(rtp_get_system_msec());
for (i = 0; i < sz; i++ ) {
output[i] = rtp_rand() % 256;
if ( (i % 8) == 7)
rtp_srand(rtp_get_system_msec());
}
return 0;
}
#elif defined(MICRIUM)
int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
{
#if (NET_SECURE_MGR_CFG_EN == DEF_ENABLED)
NetSecure_InitSeed(output, sz);
#endif
return 0;
}
#elif defined(MBED)
/* write a real one !!!, just for testing board */
int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
{
int i;
for (i = 0; i < sz; i++ )
output[i] = i;
return 0;
}
#elif defined(NO_DEV_RANDOM)
#error "you need to write an os specific GenerateSeed() here"
#else /* !USE_WINDOWS_API && !THREADX && !MICRIUM && !NO_DEV_RANDOM */
/* may block */
int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
{
os->fd = open("/dev/urandom",O_RDONLY);
if (os->fd == -1) {
/* may still have /dev/random */
os->fd = open("/dev/random",O_RDONLY);
if (os->fd == -1)
return OPEN_RAN_E;
}
while (sz) {
int len = read(os->fd, output, sz);
if (len == -1)
return READ_RAN_E;
sz -= len;
output += len;
if (sz)
#ifdef BLOCKING
sleep(0); /* context switch */
#else
return RAN_BLOCK_E;
#endif
}
close(os->fd);
return 0;
}
#endif /* USE_WINDOWS_API */
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