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/* fhandler_dev_random.cc: code to access /dev/random
Copyright 2000 Cygnus Solutions.
Written by Corinna Vinschen (vinschen@cygnus.com)
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include <errno.h>
#include "winsup.h"
#define RANDOM 8
#define URANDOM 9
fhandler_dev_random::fhandler_dev_random (const char *name, int nunit)
: fhandler_base (FH_RANDOM, name),
unit(nunit),
crypt_prov((HCRYPTPROV)NULL)
{
set_cb (sizeof *this);
}
int
fhandler_dev_random::open (const char *, int flags, mode_t)
{
set_flags (flags);
return 1;
}
int
fhandler_dev_random::write (const void *, size_t len)
{
return len;
}
int
fhandler_dev_random::read (void *ptr, size_t len)
{
if (!len)
return 0;
if (!crypt_prov
&& !CryptAcquireContext (&crypt_prov, NULL, MS_DEF_PROV, PROV_RSA_FULL,
CRYPT_MACHINE_KEYSET)
&& !CryptAcquireContext (&crypt_prov, NULL, MS_DEF_PROV, PROV_RSA_FULL,
CRYPT_MACHINE_KEYSET | CRYPT_NEWKEYSET ))
{
__seterrno ();
return -1;
}
if (!CryptGenRandom (crypt_prov, len, (BYTE *)ptr))
{
__seterrno ();
return -1;
}
return len;
}
off_t
fhandler_dev_random::lseek (off_t, int)
{
return 0;
}
int
fhandler_dev_random::close (void)
{
if (crypt_prov)
while (!CryptReleaseContext (crypt_prov, 0)
&& GetLastError () == ERROR_BUSY)
Sleep(10);
return 0;
}
int
fhandler_dev_random::dup (fhandler_base *child)
{
fhandler_dev_random *fhr = (fhandler_dev_random *) child;
fhr->unit = unit;
fhr->crypt_prov = (HCRYPTPROV)NULL;
return 0;
}
void
fhandler_dev_random::dump ()
{
paranoid_printf("here, fhandler_dev_random");
}
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