libjava/gnu/java/security/jce/prng/natVMSecureRandomPosix.cc

   1 // natVMSecureRandomPosix.cc - Native part of VMSecureRandom class for POSIX.
   2
   3 /* Copyright (C) 2009 Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #include <config.h>
  12
  13 #include <sys/types.h>
  14 #include <sys/stat.h>
  15 #include <fcntl.h>
  16 #include <unistd.h>
  17 #include <string.h>
  18 #include <errno.h>
  19
  20 #include <gcj/cni.h>
  21 #include <java/lang/InternalError.h>
  22 #include <gnu/java/security/jce/prng/VMSecureRandom.h>
  23
  24 jint
  25 gnu::java::security::jce::prng::VMSecureRandom::natGenerateSeed(jbyteArray byte_array, jint offset, jint length)
  26 {
  27   int a, fd;
  28   jbyte *bytes = elements (byte_array);
  29   ssize_t count;
  30
  31   for (a = 0; a < offset; ++a)
  32     bytes++;
  33   fd = open ("/dev/random", O_RDONLY);
  34
  35   if (fd == -1)
  36     {
  37       jstring oserr = JvNewStringLatin1 (strerror (errno));
  38       throw new ::java::lang::InternalError
  39         (JvNewStringLatin1 ("Error opening /dev/random: ")->concat(oserr));
  40     }
  41
  42   count = read (fd, bytes, length);
  43   close (fd);
  44
  45   if (count == -1)
  46     {
  47       jstring oserr = JvNewStringLatin1 (strerror (errno));
  48       throw new ::java::lang::InternalError
  49         (JvNewStringLatin1 ("Error reading /dev/random: ")->concat(oserr));
  50     }
  51
  52   return count;
  53 }
  54