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