Changeset 4447:330209bb6de3 in roaraudio

Timestamp:

10/09/10 19:51:24 (14 years ago)

Author:

phi

Branch:

default

Phase:

public

Message:

added general random functions and support for gcrypt backend

Files:

• include/libroar/random.h (modified) (1 diff)
• libroar/random.c (modified) (1 diff)

include/libroar/random.h

@@ -39 +39 @@
 #include "libroar.h"
 
+#define ROAR_RANDOM_NONE         0
+#define ROAR_RANDOM_VERY_WEAK    1
+#define ROAR_RANDOM_WEAK         2
+#define ROAR_RANDOM_NORMAL       3
+#define ROAR_RANDOM_STRONG       4
+#define ROAR_RANDOM_VERY_STRONG  5
+
+int roar_random_gen(void * buffer, size_t len, int quality);
+
+void * roar_random_genbuf(size_t len, int quality, int locked);
+
 #endif
 

libroar/random.c

@@ -36 +36 @@
 #include "libroar.h"
 
+#ifdef ROAR_HAVE_LIBGCRYPT
+#include <gcrypt.h>
+#endif
+
+static void roar_random_init (void) {
+ static int inited = 0;
+
+ if (inited)
+  return;
+
+ // add stuff here needed to bring up random source.
+
+ inited = 1;
+}
+
+int roar_random_gen(void * buffer, size_t len, int quality) {
+ if ( len == 0 )
+  return 0;
+
+ if ( buffer == NULL )
+  return -1;
+
+ roar_random_init();
+
+ switch (quality) {
+  case ROAR_RANDOM_NONE:
+    // no entropy:
+    memset(buffer, 0, len);
+   break;
+#ifdef ROAR_HAVE_LIBGCRYPT
+  case ROAR_RANDOM_VERY_WEAK:
+  case ROAR_RANDOM_WEAK:
+    gcry_create_nonce(buffer, len);
+   break;
+  case ROAR_RANDOM_NORMAL:
+  case ROAR_RANDOM_STRONG:
+    gcry_randomize(buffer, len, GCRY_STRONG_RANDOM);
+   break;
+  case ROAR_RANDOM_VERY_STRONG:
+    gcry_randomize(buffer, len, GCRY_VERY_STRONG_RANDOM);
+   break;
+#endif
+  default:
+    return -1;
+   break;
+ }
+
+ return 0;
+}
+
+void * roar_random_genbuf(size_t len, int quality, int locked) {
+ void * ret = roar_mm_malloc(len);
+
+ if (ret == NULL)
+  return NULL;
+
+ if ( locked ) {
+  if ( roar_mm_mlock(ret, len) == -1 ) {
+   roar_mm_free(ret);
+   return NULL;
+  }
+ }
+
+ if ( roar_random_gen(ret, len, quality) == -1 ) {
+  roar_mm_free(ret);
+  return NULL;
+ }
+
+ return ret;
+}
+
 //ll