anisette is done, how to sign?

tier0/rand.cpp

@@ -0,0 +1,29 @@
+#include "tier0/rand.h"
+#include "tier0/lib.h"
+
+static bool b_sIsRandInit = false;
+static FILE *s_pURandom = NULL;
+
+PLATFORM_INTERFACE void Plat_InitRandom()
+{
+	if (b_sIsRandInit)
+		return;
+	s_pURandom = V_fopen("/dev/urandom","rb");
+	if (!s_pURandom)
+		Plat_FatalErrorFunc("/dev/urandom wasn't found somehow\n");
+	b_sIsRandInit = true;
+}
+
+PLATFORM_INTERFACE void Plat_ShutdownRandom()
+{
+	b_sIsRandInit = false;
+}
+
+PLATFORM_INTERFACE void Plat_URandom( size_t uBufferSize, uint8_t *szBuffer )
+{
+	if (!b_sIsRandInit)
+		Plat_InitRandom();
+	
+	V_fread(szBuffer, 1, uBufferSize, s_pURandom);
+}
+