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path: root/pwmanager/libcrypt/cipher/rndlinux.c
authorzautrix <zautrix>2004-10-19 20:16:14 (UTC)
committer zautrix <zautrix>2004-10-19 20:16:14 (UTC)
commiteca49bb06a71980ef61d078904573f25890fc7f2 (patch) (side-by-side diff)
treec5338e3b12430248979a9ac2c1c7e6646ea9ecdf /pwmanager/libcrypt/cipher/rndlinux.c
parent53cc32b6e7b1f672bf91b2baf2df6c1e8baf3e0a (diff)
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Initial revision
Diffstat (limited to 'pwmanager/libcrypt/cipher/rndlinux.c') (more/less context) (ignore whitespace changes)
-rw-r--r--pwmanager/libcrypt/cipher/rndlinux.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/pwmanager/libcrypt/cipher/rndlinux.c b/pwmanager/libcrypt/cipher/rndlinux.c
new file mode 100644
index 0000000..fc608bc
--- a/dev/null
+++ b/pwmanager/libcrypt/cipher/rndlinux.c
@@ -0,0 +1,141 @@
+/* rndlinux.c - raw random number for OSes with /dev/random
+ * Copyright (C) 1998, 2001, 2002, 2003 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef HAVE_GETTIMEOFDAY
+# include <sys/times.h>
+#endif
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include "types.h"
+#include "g10lib.h"
+#include "rand-internal.h"
+
+static int open_device( const char *name, int minor );
+int _gcry_rndlinux_gather_random (void (*add)(const void*, size_t, int),
+ int requester,
+ size_t length, int level );
+
+/*
+ * Used to open the /dev/random devices (Linux, xBSD, Solaris (if it exists)).
+ */
+static int
+open_device( const char *name, int minor )
+{
+ int fd;
+
+ fd = open( name, O_RDONLY );
+ if( fd == -1 )
+ log_fatal ("can't open %s: %s\n", name, strerror(errno) );
+
+ /* We used to do the follwing check, however it turned out that this
+ is not portable since more OSes provide a random device which is
+ sometimes implemented as anoteher device type.
+
+ struct stat sb;
+
+ if( fstat( fd, &sb ) )
+ log_fatal("stat() off %s failed: %s\n", name, strerror(errno) );
+ if( (!S_ISCHR(sb.st_mode)) && (!S_ISFIFO(sb.st_mode)) )
+ log_fatal("invalid random device!\n" );
+ */
+ return fd;
+}
+
+
+int
+_gcry_rndlinux_gather_random (void (*add)(const void*, size_t, int),
+ int requester,
+ size_t length, int level )
+{
+ static int fd_urandom = -1;
+ static int fd_random = -1;
+ int fd;
+ int n;
+ int warn=0;
+ byte buffer[768];
+
+ if( level >= 2 )
+ {
+ if( fd_random == -1 )
+ fd_random = open_device( NAME_OF_DEV_RANDOM, 8 );
+ fd = fd_random;
+ }
+ else
+ {
+ if( fd_urandom == -1 )
+ fd_urandom = open_device( NAME_OF_DEV_URANDOM, 9 );
+ fd = fd_urandom;
+ }
+
+ while (length)
+ {
+ fd_set rfds;
+ struct timeval tv;
+ int rc;
+
+ FD_ZERO(&rfds);
+ FD_SET(fd, &rfds);
+ tv.tv_sec = 3;
+ tv.tv_usec = 0;
+ if( !(rc=select(fd+1, &rfds, NULL, NULL, &tv)) )
+ {
+ if( !warn )
+ {
+ _gcry_random_progress ("need_entropy", 'X', 0, (int)length);
+ warn = 1;
+ }
+ continue;
+ }
+ else if( rc == -1 )
+ {
+ log_error ("select() error: %s\n", strerror(errno));
+ continue;
+ }
+
+ do
+ {
+ int nbytes = length < sizeof(buffer)? length : sizeof(buffer);
+ n = read(fd, buffer, nbytes );
+ if( n >= 0 && n > nbytes )
+ {
+ log_error("bogus read from random device (n=%d)\n", n );
+ n = nbytes;
+ }
+ }
+ while( n == -1 && errno == EINTR );
+ if( n == -1 )
+ log_fatal("read error on random device: %s\n", strerror(errno));
+ (*add)( buffer, n, requester );
+ length -= n;
+ }
+ memset(buffer, 0, sizeof(buffer) );
+
+ return 0; /* success */
+}