change default configurations on systems with UNIX domain sockets to NOT specify...

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

diff --git a/src/util/crypto_random.c b/src/util/crypto_random.c
index c74d60f4f8bc7ad2767e7e05d4a8395ed2d99ad0..121dbef9a544809cf56b9498243e729bec433347 100644 (file)
--- a/src/util/crypto_random.c
+++ b/src/util/crypto_random.c
@@ -34,6 +34,36 @@
 
 #define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util", syscall)
 
+/* TODO: ndurner, move this to plibc? */
+/* The code is derived from glibc, obviously */
+#if MINGW
+#ifdef RANDOM
+#undef RANDOM
+#endif
+#ifdef SRANDOM
+#undef SRANDOM
+#endif
+#define RANDOM() glibc_weak_rand32()
+#define SRANDOM(s) glibc_weak_srand32(s)
+static int32_t glibc_weak_rand32_state = 1;
+
+void
+glibc_weak_srand32 (int32_t s)
+{
+  glibc_weak_rand32_state = s;
+}
+
+int32_t
+glibc_weak_rand32 ()
+{
+  int32_t val = glibc_weak_rand32_state;
+
+  val = ((glibc_weak_rand32_state * 1103515245) + 12345) & 0x7fffffff;
+  glibc_weak_rand32_state = val;
+  return val;
+}
+#endif
+
 /**
  * Create a cryptographically weak pseudo-random number in the interval of 0 to 1.
  *
@@ -45,6 +75,17 @@ weak_random ()
   return ((double) RANDOM () / RAND_MAX);
 }
 
+/**
+ * Seed a weak random generator. Only GNUNET_CRYPTO_QUALITY_WEAK-mode generator
+ * can be seeded.
+ *
+ * @param seed the seed to use
+ */
+void
+GNUNET_CRYPTO_seed_weak_random (int32_t seed)
+{
+  SRANDOM (seed);
+}
 
 /**
  * Produce a random value.
@@ -262,19 +303,20 @@ void __attribute__ ((constructor)) GNUNET_CRYPTO_random_init ()
   gcry_control (GCRYCTL_DISABLE_SECMEM, 0);
   if (!gcry_check_version (GCRYPT_VERSION))
   {
-    fprintf (stderr,
+    FPRINTF (stderr,
              _
              ("libgcrypt has not the expected version (version %s is required).\n"),
              GCRYPT_VERSION);
-    abort ();
+    GNUNET_abort ();
   }
 #ifdef gcry_fast_random_poll
   gcry_fast_random_poll ();
 #endif
   gcry_set_progress_handler (&entropy_generator, NULL);
   atexit (&killfind);
-  SRANDOM (time (NULL) ^
-           GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
+  GNUNET_CRYPTO_seed_weak_random (time (NULL) ^
+                                  GNUNET_CRYPTO_random_u32
+                                  (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
 }