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/*
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
This program 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; version 2 of the License.
This program 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; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 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)
#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];
byte junk[256];
seed_.GenerateSeed(key, sizeof(key));
cipher_.SetKey(key, sizeof(key));
GenerateBlock(junk, sizeof(junk)); // rid initial state
}
// 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);
}
#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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