Anders Kaseorg
ecdd2dd648
In the old code, cppcheck complained about throwing in the destructor, but like, seriously? Signed-off-by: Anders Kaseorg <andersk@mit.edu>
92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
/*
|
|
Mosh: the mobile shell
|
|
Copyright 2012 Keith Winstein
|
|
|
|
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, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
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. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
In addition, as a special exception, the copyright holders give
|
|
permission to link the code of portions of this program with the
|
|
OpenSSL library under certain conditions as described in each
|
|
individual source file, and distribute linked combinations including
|
|
the two.
|
|
|
|
You must obey the GNU General Public License in all respects for all
|
|
of the code used other than OpenSSL. If you modify file(s) with this
|
|
exception, you may extend this exception to your version of the
|
|
file(s), but you are not obligated to do so. If you do not wish to do
|
|
so, delete this exception statement from your version. If you delete
|
|
this exception statement from all source files in the program, then
|
|
also delete it here.
|
|
*/
|
|
|
|
#ifndef PRNG_HPP
|
|
#define PRNG_HPP
|
|
|
|
#include <string>
|
|
#include <stdint.h>
|
|
#include <fstream>
|
|
|
|
#include "crypto.h"
|
|
|
|
/* Read random bytes from /dev/urandom.
|
|
|
|
We rely on stdio buffering for efficiency. */
|
|
|
|
static const char rdev[] = "/dev/urandom";
|
|
|
|
using namespace Crypto;
|
|
|
|
class PRNG {
|
|
private:
|
|
std::ifstream randfile;
|
|
|
|
/* unimplemented to satisfy -Weffc++ */
|
|
PRNG( const PRNG & );
|
|
PRNG & operator=( const PRNG & );
|
|
|
|
public:
|
|
PRNG() : randfile( rdev, std::ifstream::in | std::ifstream::binary ) {}
|
|
|
|
void fill( void *dest, size_t size ) {
|
|
if ( 0 == size ) {
|
|
return;
|
|
}
|
|
|
|
randfile.read( static_cast<char *>( dest ), size );
|
|
if ( !randfile ) {
|
|
throw CryptoException( "Could not read from " + std::string( rdev ) );
|
|
}
|
|
}
|
|
|
|
uint8_t uint8() {
|
|
uint8_t x;
|
|
fill( &x, 1 );
|
|
return x;
|
|
}
|
|
|
|
uint32_t uint32() {
|
|
uint32_t x;
|
|
fill( &x, 4 );
|
|
return x;
|
|
}
|
|
|
|
uint64_t uint64() {
|
|
uint64_t x;
|
|
fill( &x, 8 );
|
|
return x;
|
|
}
|
|
};
|
|
|
|
#endif
|