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/* random.cpp
*
* Copyright (C) 2003 Sawtooth Consulting Ltd.
*
* This file is part of yaSSL.
*
* yaSSL 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.
*
* There are special exceptions to the terms and conditions of the GPL as it
* is applied to yaSSL. View the full text of the exception in the file
* FLOSS-EXCEPTIONS in the directory of this software distribution.
*
* yaSSL 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
*/
/* random.cpp implements a crypto secure Random Number Generator using an OS
specific seed, switch to /dev/random for more security but may block
*/
#include "runtime.hpp"
#include "random.hpp"
#include <string.h>
#include <time.h>
#if defined(_WIN32)
#define _WIN32_WINNT 0x0400
#include <windows.h>
#include <wincrypt.h>
#else
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#endif // _WIN32
namespace TaoCrypt {
// Get seed and key cipher
RandomNumberGenerator::RandomNumberGenerator()
{
byte key[32];
seed_.GenerateSeed(key, sizeof(key));
cipher_.SetKey(key, sizeof(key));
}
// place a generated block in output
void RandomNumberGenerator::GenerateBlock(byte* output, word32 sz)
{
memset(output, 0, sz);
cipher_.Process(output, output, sz);
}
byte RandomNumberGenerator::GenerateByte()
{
byte b;
GenerateBlock(&b, 1);
return b;
}
#if defined(_WIN32)
/* The OS_Seed implementation for windows */
OS_Seed::OS_Seed()
{
if(!CryptAcquireContext(&handle_, 0, 0, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT))
error_.SetError(WINCRYPT_E);
}
OS_Seed::~OS_Seed()
{
CryptReleaseContext(handle_, 0);
}
void OS_Seed::GenerateSeed(byte* output, word32 sz)
{
if (!CryptGenRandom(handle_, sz, output))
error_.SetError(CRYPTGEN_E);
}
#elif defined(__NETWARE__)
/* The OS_Seed implementation for Netware */
#include <nks/thread.h>
#include <nks/plat.h>
// Loop on high resulution Read Time Stamp Counter
static void NetwareSeed(byte* output, word32 sz)
{
word32 tscResult;
for (word32 i = 0; i < sz; i += sizeof(tscResult)) {
#if defined(__GNUC__)
asm volatile("rdtsc" : "=A" (tscResult));
#else
#ifdef __MWERKS__
asm {
#else
__asm {
#endif
rdtsc
mov tscResult, eax
}
#endif
memcpy(output, &tscResult, sizeof(tscResult));
output += sizeof(tscResult);
NXThreadYield(); // induce more variance
}
}
OS_Seed::OS_Seed()
{
}
OS_Seed::~OS_Seed()
{
}
void OS_Seed::GenerateSeed(byte* output, word32 sz)
{
/*
Try to use NXSeedRandom as it will generate a strong
seed using the onboard 82802 chip
As it's not always supported, fallback to default
implementation if an error is returned
*/
if (NXSeedRandom(sz, output) != 0)
{
NetwareSeed(output, sz);
}
}
#else
/* The default OS_Seed implementation */
OS_Seed::OS_Seed()
{
fd_ = open("/dev/urandom",O_RDONLY);
if (fd_ == -1) {
fd_ = open("/dev/random",O_RDONLY);
if (fd_ == -1)
error_.SetError(OPEN_RAN_E);
}
}
OS_Seed::~OS_Seed()
{
close(fd_);
}
// may block
void OS_Seed::GenerateSeed(byte* output, word32 sz)
{
while (sz) {
int len = read(fd_, output, sz);
if (len == -1) {
error_.SetError(READ_RAN_E);
return;
}
sz -= len;
output += len;
if (sz)
sleep(1);
}
}
#endif // _WIN32
} // namespace
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