67 lines
1.2 KiB
C++
67 lines
1.2 KiB
C++
#include "precomp.h"
|
|
|
|
#include "bigint.h"
|
|
#include "rand.h"
|
|
|
|
#ifdef _WIN32
|
|
#include <windows.h>
|
|
#include <wincrypt.h>
|
|
#endif
|
|
|
|
#include <stdlib.h>
|
|
|
|
random::random()
|
|
{
|
|
#ifdef _WIN32
|
|
if ( !CryptAcquireContext( (HCRYPTPROV *)&m_hCryptProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT ) )
|
|
m_hCryptProv = NULL;
|
|
#else
|
|
::srand(time(NULL));
|
|
#endif
|
|
}
|
|
|
|
random::~random()
|
|
{
|
|
#ifdef _WIN32
|
|
if ( m_hCryptProv )
|
|
CryptReleaseContext( (HCRYPTPROV)m_hCryptProv, 0L );
|
|
#endif
|
|
}
|
|
|
|
unsigned random::rand( unsigned max )
|
|
{
|
|
unsigned rnd;
|
|
|
|
#ifdef _WIN32
|
|
if ( m_hCryptProv )
|
|
CryptGenRandom( (HCRYPTPROV)m_hCryptProv, sizeof( unsigned ), (BYTE *)&rnd );
|
|
#else
|
|
rnd = ::rand();
|
|
#endif
|
|
|
|
return rnd % max;
|
|
}
|
|
|
|
bigint random::rand( bigint & max )
|
|
{
|
|
unsigned n = ( max.bits() + ( ( sizeof( unsigned ) << 3 ) - 1 ) ) / ( sizeof( unsigned ) << 3 );
|
|
unsigned * buf = (unsigned*)malloc(n * sizeof(unsigned));
|
|
if ( !buf ) return max - 1;
|
|
|
|
bigint rnd;
|
|
|
|
#ifdef _WIN32
|
|
if ( m_hCryptProv )
|
|
CryptGenRandom( (HCRYPTPROV)m_hCryptProv, n * sizeof( unsigned ), (BYTE *)buf );
|
|
#else
|
|
for (unsigned i = 0; i < n; i++)
|
|
*((unsigned *)buf + i) = ::rand();
|
|
#endif
|
|
|
|
rnd.load( buf, n );
|
|
|
|
free(buf);
|
|
|
|
return rnd % max;
|
|
}
|