Added LinuxRandom class, seperate URandom class

Renegade.Random.LinuxRandom.pas

@@ -0,0 +1,129 @@
+{*******************************************************}
+{                                                       }
+{   Renegade BBS                                        }
+{                                                       }
+{   Copyright (c) 1990-2013 The Renegade Dev Team       }
+{   Copyleft  (ↄ) 2016 Renegade BBS                     }
+{                                                       }
+{   This file is part of Renegade BBS                   }
+{                                                       }
+{   Renegade is free software: you can redistribute it  }
+{   and/or modify it under the terms of the GNU General }
+{   Public License as published by the Free Software    }
+{   Foundation, either version 3 of the License, or     }
+{   (at your option) any later version.                 }
+{                                                       }
+{   Renegade is distributed in the hope that it will be }
+{   useful, but WITHOUT ANY WARRANTY; without even the  }
+{   implied warranty of MERCHANTABILITY or FITNESS FOR  }
+{   A PARTICULAR PURPOSE.  See the GNU General Public   }
+{   License for more details.                           }
+{                                                       }
+{   You should have received a copy of the GNU General  }
+{   Public License along with Renegade.  If not, see    }
+{   <http://www.gnu.org/licenses/>.                     }
+{                                                       }
+{*******************************************************}
+{   _______                                  __         }
+{  |   _   .-----.-----.-----.-----.---.-.--|  .-----.  }
+{  |.  l   |  -__|     |  -__|  _  |  _  |  _  |  -__|  }
+{  |.  _   |_____|__|__|_____|___  |___._|_____|_____|  }
+{  |:  |   |                 |_____|                    }
+{  |::.|:. |                                            }
+{  `--- ---'                                            }
+{*******************************************************}
+
+{$mode objfpc}{$H+}
+Unit Renegade.Random.LinuxRandom;
+
+interface
+
+uses
+  CTypes,
+  Objects,
+  Classes,
+  SysUtils,
+  Renegade.Random.RandomInterface;
+
+const
+  {$IF DEFINED(CPU64)} SYS_getrandom = 318;
+  {$ELSEIF DEFINED(CPU32)} SYS_getrandom = 355;
+  {$ELSE} SYS_getrandom = 278; {$ENDIF}
+  GRND_DEFAULT = $0000;
+
+type
+  PCChar = ^CChar;
+  PLinuxRandom = ^LinuxRandom;
+  LinuxRandom = class (RandomTrait, RandomInterface)
+    private
+      function GetSystemBytes(var RandomByteBuffer : TBytes; NBytes : SizeUint) : CInt;
+    public
+      function GetBytes(NBytes : SizeUInt) : TBytes;
+      function GetString(NBytes : SizeUInt) : AnsiString;
+  end;
+
+function syscall(NRGetRandom : CInt) : CInt;cdecl;varargs;external 'c' name 'syscall';
+
+implementation
+
+function LinuxRandom.GetSystemBytes(var RandomByteBuffer : TBytes; NBytes : SizeUint) : CInt;
+var
+  RandomCharBuffer : PCChar;
+  Return : CInt;
+begin
+  GetMem(RandomCharBuffer, NBytes);
+  Return := syscall(SYS_getrandom, @RandomCharBuffer^, NBytes, GRND_DEFAULT);
+  Move(RandomCharBuffer[0], RandomByteBuffer[0], NBytes);
+  FreeMem(RandomCharBuffer);
+  Result := Return;
+end;
+
+function LinuxRandom.GetBytes(NBytes : SizeUInt) : TBytes;
+var
+  RandomBuffer : AnsiString;
+begin
+  SetLength(Result, NBytes);
+  SetLength(RandomBuffer, NBytes);
+  RandomBuffer := GetString(NBytes);
+  Move(RandomBuffer[1], Result[0], NBytes);
+end;
+
+function LinuxRandom.GetString(NBytes : SizeUInt) : AnsiString;
+var
+  Buffer : TFileStream;
+  RandomByteBuffer : TBytes;
+  ReadBytes : SizeUInt;
+  SysBytesRead : CInt;
+begin
+  SetLength(RandomByteBuffer, (NBytes*2));
+  SetLength(Result, NBytes);
+  SysBytesRead := GetSystemBytes(RandomByteBuffer, (NBytes*2));
+  if (SysBytesRead <> (NBytes*2)) then
+    begin
+      if FileExists('/dev/urandom') then
+        begin
+          Writeln('URandom');
+          Buffer := TFileStream.Create('/dev/urandom', fmOpenRead);
+          Buffer.Position := 0;
+          ReadBytes := 0;
+          while ReadBytes <= (NBytes*2) do
+            begin
+              Buffer.Read(RandomByteBuffer[ReadBytes], SizeOf(RandomByteBuffer));
+              Inc(ReadBytes);
+            end;
+          Buffer.Free;
+        end
+        else if (not FileExists('/dev/udrandom')) then
+        begin
+            Writeln('Random');
+            RandomByteBuffer := MTRandomBytes((NBytes*2));
+        end else
+        begin
+          raise Exception.Create('All methods to aquire random bytes failed.')
+            at get_caller_addr(get_frame), get_caller_frame(get_frame);
+        end;
+    end;
+  Move(RandomByteBuffer[0], Result[1], NBytes);
+end;
+
+end.

Renegade.Random.pas

@@ -45,7 +45,7 @@ uses
   SysUtils,
   Renegade.Random.RandomInterface,
 {$IF DEFINED(LINUX)}
-  Renegade.Random.URandom
+  Renegade.Random.LinuxRandom
 {$ELSEIF DEFINED(WINDOWS)}
   Renegade.Random.WinRandom
 {$ELSEIF DEFINED(BSD)}
@@ -91,7 +91,7 @@ end;
 procedure TRandom.SetDefaultGenerator;
 begin
   {$IF DEFINED(LINUX)}
-    FRandomGenerator := URandom.Create;
+    FRandomGenerator := LinuxRandom.Create;
   {$ELSEIF DEFINED(WINDOWS)}
     FRandomGenerator := WinRandom.Create;
   {$ELSEIF DEFINED(BSD)}

tests/RandomTest.pas

@@ -46,6 +46,7 @@ begin
   Assert(Length(S) = 22);
   Assert(High(S) = 22);
   Assert(Low(S) = 1);
+  Writeln(S);
   for i := Low(S) to High(S) do
     begin
       Assert(S[i] in [#0..#255]);
@@ -61,7 +62,7 @@ begin
     end;
     RRandom.Free;
     try // Check for access violation after free.
-      RRandom.GetString(22);
+      S := RRandom.GetString(22);
     except
       on e: Exception do
         begin