X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/fdca70eebfb07306ea5f57fa6787e86f913416d2..477b12ff719d3749b8d8f85035bd6384fee9be0d:/lib/random.c

diff --git a/lib/random.c b/lib/random.c
index 21d0b09..ee53a9a 100644
--- a/lib/random.c
+++ b/lib/random.c
@@ -2,20 +2,18 @@
  * This file is part of DisOrder
  * Copyright (C) 2008 Richard Kettlewell
  *
- * This program is free software; you can redistribute it and/or modify
+ * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
- *
- * This program 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
- * General Public License for more details.
- *
+ * 
+ * This program 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 General Public License for more details.
+ * 
  * You should have received a copy of the GNU 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 /** @file lib/random.c
@@ -23,42 +21,40 @@
  *
  */
 
-#include <config.h>
-#include "types.h"
+#include "common.h"
 
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
-#include <string.h>
 
 #include "random.h"
 #include "log.h"
-#include "arcfour.h"
+#include "salsa208.h"
 #include "basen.h"
 #include "mem.h"
 
 static int random_count;
 static int random_fd = -1;
-static arcfour_context random_ctx[1];
+static salsa208_context random_ctx[1];
 
 /** @brief Rekey the RNG
  *
  * Resets the RNG's key to a random one read from /dev/urandom
  */
 static void random__rekey(void) {
-  char key[128];
+  char key[32];
   int n;
 
   if(random_fd < 0) {
     if((random_fd = open("/dev/urandom", O_RDONLY)) < 0)
-      fatal(errno, "opening /dev/urandom");
+      disorder_fatal(errno, "opening /dev/urandom");
   }
   if((n = read(random_fd, key, sizeof key)) < 0)
-    fatal(errno, "reading from /dev/urandom");
+    disorder_fatal(errno, "reading from /dev/urandom");
   if((size_t)n < sizeof key)
-    fatal(0, "reading from /dev/urandom: short read");
-  arcfour_setkey(random_ctx, key, sizeof key);
-  random_count = 8 * 1024 * 1024;
+    disorder_fatal(0, "reading from /dev/urandom: short read");
+  salsa208_setkey(random_ctx, key, sizeof key);
+  random_count = 256 * 1024 * 1024;
 }
 
 /** @brief Get random bytes
@@ -68,9 +64,7 @@ static void random__rekey(void) {
 void random_get(void *ptr, size_t bytes) {
   if(random_count == 0)
     random__rekey();
-  /* Encrypting 0s == just returning the keystream */
-  memset(ptr, 0, bytes);
-  arcfour_stream(random_ctx, (char *)ptr, (char *)ptr, bytes);
+  salsa208_stream(random_ctx, 0, ptr, bytes);
   if(bytes > (size_t)random_count)
     random_count = 0;
   else
@@ -79,11 +73,11 @@ void random_get(void *ptr, size_t bytes) {
 
 /** @brief Return a random ID string */
 char *random_id(void) {
-  unsigned long words[2];
+  uint32_t words[2];
   char id[128];
 
   random_get(words, sizeof words);
-  basen(words, 4, id, sizeof id, 62);
+  basen(words, sizeof words / sizeof *words, id, sizeof id, 62);
   return xstrdup(id);
 }