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// natVMSecureRandomPosix.cc - Native part of VMSecureRandom class for POSIX.

/* Copyright (C) 2009 Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the

Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for

details.  */

#include <config.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <string.h>

#include <errno.h>

#include <gcj/cni.h>

#include <java/lang/InternalError.h>

#include <gnu/java/security/jce/prng/VMSecureRandom.h>

jint

gnu::java::security::jce::prng::VMSecureRandom::natGenerateSeed(jbyteArray byte_array, jint offset, jint length)

{

  int a, fd;

  jbyte *bytes = elements (byte_array);

  ssize_t count;

  for (a = 0; a < offset; ++a)

    bytes++;

  fd = open ("/dev/random", O_RDONLY);

  if (fd == -1)

    {

      jstring oserr = JvNewStringLatin1 (strerror (errno));

      throw new ::java::lang::InternalError

        (JvNewStringLatin1 ("Error opening /dev/random: ")->concat(oserr));

    }

  count = read (fd, bytes, length);

  close (fd);

  if (count == -1)

    {

      jstring oserr = JvNewStringLatin1 (strerror (errno));

      throw new ::java::lang::InternalError

        (JvNewStringLatin1 ("Error reading /dev/random: ")->concat(oserr));

    }

  return count;

}