replace internal uses of gettimeofday with monotonic time where appropriate. make...

[lcore.git] / lcorernd.pas

diff --git a/lcorernd.pas b/lcorernd.pas
index 8f79856745c7580f669f268a3f51a0c2dfab41af..6f1fe4877cc44df1b1bd3333a423f14d66fff4d0 100644 (file)
--- a/lcorernd.pas
+++ b/lcorernd.pas
@@ -4,7 +4,9 @@
   ----------------------------------------------------------------------------- }\r
 \r
 unit lcorernd;\r
-\r
+{$ifdef fpc}\r
+  {$mode delphi}\r
+{$endif}\r
 interface\r
 \r
 {$include lcoreconfig.inc}\r
@@ -15,7 +17,7 @@ written by Bas Steendijk (beware)
 the aim of this unit is to provide randomness in a consistent way, using OS specific methods for seeding\r
 \r
 this unit uses MD5 for performance and code size, but it is made so it is easy to use a different hash,\r
-as long as it is atleat 128 bits, and a multiple of the "word size" (32 bits)\r
+as long as it is at least 128 bits, and a multiple of the "word size" (32 bits)\r
 \r
 goals:\r
 \r
@@ -25,20 +27,20 @@ goals:
 \r
 - for the numbers to be\r
  - random: pass diehard and similar tests\r
- - unique: generate UUID's\r
+ - unique: generate UUIDs\r
  - secure: difficult for a remote attacker to guess the internal state, even\r
    when given some output\r
 \r
 typical intended uses:\r
  - anything that needs random numbers without extreme demands on security or\r
    speed should be able to use this\r
- - seeding other (faster) RNG's\r
- - generation of passwords, UUID's, cookies, and session keys\r
+ - seeding other (faster) RNGs\r
+ - generation of passwords, UUIDs, cookies, and session keys\r
  - randomizing protocol fields to protect against spoofing attacks\r
  - randomness for games\r
 \r
 this is not intended to be directly used for:\r
-- high securirity purposes (generating RSA root keys etc)\r
+- high security purposes (generating RSA root keys etc)\r
 - needing random numbers at very high rates (disk wiping, some simulations, etc)\r
 \r
 performance:\r
@@ -176,18 +178,35 @@ const
   halfhashsize=hashsize div 2;\r
   hashdwords=hashsize div wordsize;\r
   pooldwords=3*hashdwords;\r
-  seeddwords=32;\r
+  seeddwords=40;\r
   hashpasssize=48; {this number has to be small enough that hashing this size uses only one block transform}\r
 \r
 var\r
-  {the seed part of this buffer must be atleast as big as the OS seed (windows: 104 bytes, unix: 36 bytes)}\r
+  //the seed part of this buffer must be at least as big as the OS seed (windows: 120 bytes for 32 bits, 160 bytes for 64 bits, unix: 36 bytes)\r
   pool:array[0..(pooldwords+seeddwords-1)] of wordtype;\r
   reseedcountdown:integer;\r
 \r
 {$ifdef mswindows}\r
+var\r
+  systemfunction036:function(var v; c:cardinal): boolean;  stdcall;\r
+  rtlgenrandominited:boolean;\r
+\r
+procedure initrtlgenrandom;\r
+var\r
+  h:thandle;\r
+begin\r
+  rtlgenrandominited := true;\r
+  systemfunction036 := nil;  \r
+  h := loadlibrary('advapi32.dll');\r
+  if (h <> 0) then begin\r
+    systemfunction036 := GetProcAddress(h,'SystemFunction036');\r
+  end;\r
+end;\r
+\r
 function collect_seeding(var output;const bufsize:integer):integer;\r
 var\r
   l:packed record\r
+    rtlgenrandom:array[0..3] of longint;\r
     guid:array[0..3] of longint;\r
     qpcbuf:array[0..1] of longint;\r
     rdtscbuf:array[0..1] of longint;\r
@@ -221,6 +240,10 @@ begin
   getcursorpos(l.cursor);\r
 \r
   l.hs := getheapstatus;\r
+\r
+  {rtlgenrandom}\r
+  if not rtlgenrandominited then initrtlgenrandom;\r
+  if assigned(@systemfunction036) then systemfunction036(l.rtlgenrandom,sizeof(l.rtlgenrandom));\r
 end;\r
 {$endif}\r
 \r