speedup mechanism to manipulate gnunet time

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

diff --git a/src/util/crypto_random.c b/src/util/crypto_random.c
index 03f6c0e987f739b60a6ecd0b5fd49609edde0650..35d3c41e9e167bb679d29c59d62e4854e376677e 100644 (file)
--- a/src/util/crypto_random.c
+++ b/src/util/crypto_random.c
@@ -30,9 +30,43 @@
 #include "gnunet_os_lib.h"
 #include <gcrypt.h>
 
+#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
+
+#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.
- * 
+ *
  * @return number between 0 and 1.
  */
 static double
@@ -41,6 +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.
@@ -71,8 +116,8 @@ GNUNET_CRYPTO_random_u32 (enum GNUNET_CRYPTO_Quality mode, uint32_t i)
     ul = UINT32_MAX - (UINT32_MAX % i);
     do
     {
-      gcry_randomize ((unsigned char *) &ret,
-                      sizeof (uint32_t), GCRY_STRONG_RANDOM);
+      gcry_randomize ((unsigned char *) &ret, sizeof (uint32_t),
+                      GCRY_STRONG_RANDOM);
     }
     while (ret >= ul);
     return ret % i;
@@ -147,8 +192,8 @@ GNUNET_CRYPTO_random_u64 (enum GNUNET_CRYPTO_Quality mode, uint64_t max)
     ul = UINT64_MAX - (UINT64_MAX % max);
     do
     {
-      gcry_randomize ((unsigned char *) &ret,
-                      sizeof (uint64_t), GCRY_STRONG_RANDOM);
+      gcry_randomize ((unsigned char *) &ret, sizeof (uint64_t),
+                      GCRY_STRONG_RANDOM);
     }
     while (ret >= ul);
     return ret % max;
@@ -195,8 +240,8 @@ static struct GNUNET_OS_Process *genproc;
  * blocked gathering entropy.
  */
 static void
-entropy_generator (void *cls,
-                   const char *what, int printchar, int current, int total)
+entropy_generator (void *cls, const char *what, int printchar, int current,
+                   int total)
 {
   unsigned long code;
   enum GNUNET_OS_ProcessStatusType type;
@@ -209,9 +254,9 @@ entropy_generator (void *cls,
     if (genproc != NULL)
     {
       if (0 != GNUNET_OS_process_kill (genproc, SIGTERM))
-        GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "kill");
+        LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "kill");
       GNUNET_break (GNUNET_OK == GNUNET_OS_process_wait (genproc));
-      GNUNET_OS_process_close (genproc);
+      GNUNET_OS_process_destroy (genproc);
       genproc = NULL;
     }
     return;
@@ -227,18 +272,18 @@ entropy_generator (void *cls,
       return;
     }
     if (0 != GNUNET_OS_process_kill (genproc, SIGTERM))
-      GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "kill");
+      LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR, "kill");
     GNUNET_break (GNUNET_OK == GNUNET_OS_process_wait (genproc));
-    GNUNET_OS_process_close (genproc);
+    GNUNET_OS_process_destroy (genproc);
     genproc = NULL;
   }
-  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
-              _("Starting `%s' process to generate entropy\n"), "find");
-  genproc = GNUNET_OS_start_process (NULL, NULL, "sh",
-                                     "sh",
-                                     "-c",
-                                     "exec find / -mount -type f -exec cp {} /dev/null \\; 2>/dev/null",
-                                     NULL);
+  LOG (GNUNET_ERROR_TYPE_INFO, _("Starting `%s' process to generate entropy\n"),
+       "find");
+  genproc =
+     GNUNET_OS_start_process (GNUNET_NO,
+                             NULL, NULL, "sh", "sh", "-c",
+                             "exec find / -mount -type f -exec cp {} /dev/null \\; 2>/dev/null",
+                             NULL);
 }
 
 
@@ -248,7 +293,7 @@ killfind ()
   if (genproc != NULL)
   {
     GNUNET_OS_process_kill (genproc, SIGKILL);
-    GNUNET_OS_process_close (genproc);
+    GNUNET_OS_process_destroy (genproc);
     genproc = NULL;
   }
 }
@@ -259,19 +304,23 @@ 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 GCRYCTL_INITIALIZATION_FINISHED
+  gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
+#endif
 #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));
 }