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// Copyright (C) 2010-2014 David Sugar, Tycho Softworks.
// Copyright (C) 2015-2020 Cherokees of Idaho.
//
// This file is part of GNU uCommon C++.
//
// GNU uCommon C++ is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU uCommon C++ 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with GNU uCommon C++. If not, see <http://www.gnu.org/licenses/>.
#include "local.h"
#ifndef _MSWINDOWS_
#include <fcntl.h>
#endif
namespace ucommon {
void Random::seed(void)
{
time_t now;
time(&now);
srand((int)now);
}
bool Random::seed(const uint8_t *buf, size_t size)
{
#ifdef _MSWINDOWS_
return false;
#else
if(is_file("/dev/hwrng") && is_readable("/dev/hwrng"))
return true;
int fd = open("/dev/random", O_WRONLY);
bool result = false;
if(fd > -1) {
if(write(fd, buf, size) > 0)
result = true;
close(fd);
}
return result;
#endif
}
size_t Random::key(uint8_t *buf, size_t size)
{
#ifdef _MSWINDOWS_
if((__handle != (HCRYPTPROV)NULL) && CryptGenRandom(__handle, (DWORD)size, buf))
return size;
return 0;
#else
int fd = open("/dev/hwrng", O_RDONLY);
if(fd < 0)
fd = open("/dev/random", O_RDONLY);
ssize_t result = 0;
if(fd > -1) {
result = read(fd, buf, size);
close(fd);
}
if(result < 0)
result = 0;
return (size_t)result;
#endif
}
size_t Random::fill(uint8_t *buf, size_t size)
{
#ifdef _MSWINDOWS_
return key(buf, size);
#else
int fd = open("/dev/urandom", O_RDONLY);
ssize_t result = 0;
if(fd > -1) {
result = read(fd, buf, size);
close(fd);
}
// ugly...would not trust it
else {
result = 0;
while(result++ < (ssize_t)size)
*(buf++) = rand() & 0xff;
}
if(result < 0)
result = 0;
return (size_t)result;
#endif
}
bool Random::status(void)
{
#ifdef _MSWINDOWS_
return true;
#else
if(fsys::is_file("/dev/hwrng") && is_readable("/dev/hwrng"))
return true;
if(fsys::is_file("/dev/random") && is_readable("/dev/random"))
return true;
return false;
#endif
}
} // namespace ucommon
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