Link libgnunetblockgroup to libgnunetblock

[oweals/gnunet.git] / src / util / crypto_random.c

diff --git a/src/util/crypto_random.c b/src/util/crypto_random.c
index ce7ec70f375b591b0987c4794b87bbcacbd93dc2..d5b5eb9ec83d96a4038b8ffc9023357779b32112 100644 (file)
--- a/src/util/crypto_random.c
+++ b/src/util/crypto_random.c
@@ -1,5 +1,5 @@
 /*
-     This file is part of GNUnet.  (C) 2001-2013 Christian Grothoff
+     This file is part of GNUnet.  Copyright (C) 2001-2014 Christian Grothoff
      (and other contributing authors)
 
      GNUnet is free software; you can redistribute it and/or modify
@@ -14,8 +14,8 @@
 
      You should have received a copy of the GNU General Public License
      along with GNUnet; see the file COPYING.  If not, write to the
-     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-     Boston, MA 02111-1307, USA.
+     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
 
 */
 
@@ -25,12 +25,12 @@
  * @author Christian Grothoff
  */
 #include "platform.h"
-#include "gnunet_util_lib.h"
+#include "gnunet_crypto_lib.h"
 #include <gcrypt.h>
 
-#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
+#define LOG(kind,...) GNUNET_log_from (kind, "util-crypto-random", __VA_ARGS__)
 
-#define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util", syscall)
+#define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util-crypto-random", syscall)
 
 
 /* TODO: ndurner, move this to plibc? */
@@ -84,7 +84,7 @@ get_weak_random ()
 
 
 /**
- * Seed a weak random generator. Only GNUNET_CRYPTO_QUALITY_WEAK-mode generator
+ * Seed a weak random generator. Only #GNUNET_CRYPTO_QUALITY_WEAK-mode generator
  * can be seeded.
  *
  * @param seed the seed to use
@@ -138,14 +138,15 @@ GNUNET_CRYPTO_random_block (enum GNUNET_CRYPTO_Quality mode, void *buffer, size_
 
 
 /**
- * Produce a random value.
+ * Produce a random unsigned 32-bit number modulo @a i.
  *
  * @param mode desired quality of the random number
  * @param i the upper limit (exclusive) for the random number
  * @return a random value in the interval [0,i[.
  */
 uint32_t
-GNUNET_CRYPTO_random_u32 (enum GNUNET_CRYPTO_Quality mode, uint32_t i)
+GNUNET_CRYPTO_random_u32 (enum GNUNET_CRYPTO_Quality mode,
+                         uint32_t i)
 {
 #ifdef gcry_fast_random_poll
   static unsigned int invokeCount;
@@ -194,13 +195,14 @@ GNUNET_CRYPTO_random_u32 (enum GNUNET_CRYPTO_Quality mode, uint32_t i)
 /**
  * Get an array with a random permutation of the
  * numbers 0...n-1.
- * @param mode GNUNET_RANDOM_QUALITY_STRONG if the strong (but expensive)
- *        PRNG should be used, GNUNET_RANDOM_QUALITY_WEAK otherwise
+ * @param mode #GNUNET_RANDOM_QUALITY_STRONG if the strong (but expensive)
+ *        PRNG should be used, #GNUNET_RANDOM_QUALITY_WEAK otherwise
  * @param n the size of the array
  * @return the permutation array (allocated from heap)
  */
 unsigned int *
-GNUNET_CRYPTO_random_permute (enum GNUNET_CRYPTO_Quality mode, unsigned int n)
+GNUNET_CRYPTO_random_permute (enum GNUNET_CRYPTO_Quality mode,
+                             unsigned int n)
 {
   unsigned int *ret;
   unsigned int i;
@@ -223,8 +225,7 @@ GNUNET_CRYPTO_random_permute (enum GNUNET_CRYPTO_Quality mode, unsigned int n)
 
 
 /**
- * Random on unsigned 64-bit values.
- *
+ * Generate random unsigned 64-bit value.
  *
  * @param mode desired quality of the random number
  * @param max value returned will be in range [0,max) (exclusive)
@@ -269,6 +270,9 @@ GNUNET_CRYPTO_random_u64 (enum GNUNET_CRYPTO_Quality mode, uint64_t max)
 }
 
 
+/**
+ * Initialize libgcrypt.
+ */
 void __attribute__ ((constructor))
 GNUNET_CRYPTO_random_init ()
 {
@@ -279,13 +283,20 @@ GNUNET_CRYPTO_random_init ()
     FPRINTF (stderr,
              _("libgcrypt has not the expected version (version %s is required).\n"),
              NEED_LIBGCRYPT_VERSION);
-    GNUNET_abort ();
+    GNUNET_assert (0);
   }
   if ((rc = gcry_control (GCRYCTL_DISABLE_SECMEM, 0)))
     FPRINTF (stderr,
              "Failed to set libgcrypt option %s: %s\n",
              "DISABLE_SECMEM",
             gcry_strerror (rc));
+  /* Otherwise gnunet-ecc takes forever to complete, besides
+     we are fine with "just" using GCRY_STRONG_RANDOM */
+  if ((rc = gcry_control (GCRYCTL_ENABLE_QUICK_RANDOM, 0)))
+    FPRINTF (stderr,
+            "Failed to set libgcrypt option %s: %s\n",
+            "ENABLE_QUICK_RANDOM",
+            gcry_strerror (rc));
   gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
   gcry_fast_random_poll ();
   GNUNET_CRYPTO_seed_weak_random (time (NULL) ^
@@ -294,11 +305,16 @@ GNUNET_CRYPTO_random_init ()
 }
 
 
+/**
+ * Nicely shut down libgcrypt.
+ */
 void __attribute__ ((destructor))
 GNUNET_CRYPTO_random_fini ()
 {
   gcry_set_progress_handler (NULL, NULL);
+#ifdef GCRYCTL_CLOSE_RANDOM_DEVICE
   (void) gcry_control (GCRYCTL_CLOSE_RANDOM_DEVICE, 0);
+#endif
 }