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GNU GENERAL PUBLIC LICENSE
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# Free Pascal Random Bytes
This file is a part of [Renegade BBS](http://renegade.cc "Renegade BBS").
This will only work with [Free Pascal](http://freepascal.org "Free Pascal") version 3+. I Think [namespacing](http://wiki.freepascal.org/FPC_New_Features_3.0#Delphi-like_namespaces_units "Namespaces") is a good idea, and FPC 3+ is not hard to get your hands on for any platform. In fact, I believe its the most cross platform program that I have ever found, _**including** [ScummVM](http://scummvm.org/ "ScummVM is a program which allows you to run certain classic graphical point-and-click adventure games, provided you already have their data files.")_.
##### From the Free Pascal website :
_Free Pascal is a 32, 64 and 16 bit professional Pascal compiler. It can target many processor architectures: Intel x86 (including 8086), AMD64/x86-64, PowerPC, PowerPC64, SPARC, ARM, AArch64, MIPS and the JVM. Supported operating systems include Linux, FreeBSD, Haiku, Mac OS X/iOS/iPhoneSimulator/Darwin, DOS (16 and 32 bit), Win32, Win64, WinCE, OS/2, MorphOS, Nintendo GBA, Nintendo DS, Nintendo Wii, Android, AIX and AROS. Additionally, support for the Motorola 68k architecture is available in the development versions._
### Usage
Make sure to include ```{$mode objfpc}{$H+}``` in your header or compile with ```-S2 -Sh``` switches.
```pascal
Program RandomTest;
{$mode objfpc}{$H+}
uses
Renegade.Random,
Classes;
var
R : TRandom;
S : AnsiString;
T : TBytes;
begin
R := TRandom.Init;
S := R.GetString(22);
T := R.GetBytes(22);
R.Free;
```
You can also use a custom random generator. It needs to implement Renegade.Random.RandomInterface;
```pascal
Program RandomTest;
{$mode objfpc}{$H+}
uses
Renegade.Random,
MyCustomGenerator,
Classes;
var
R : TRandom;
S : AnsiString;
T : TBytes;
begin
R := TRandom.Init;
R.RandomGenerator := MyCustomGenerator.Create;
S := R.GetString(22);
T := R.GetBytes(22);
R.SetDefaultGenerator; // To get back to the default Generator.
S := R.GetString(22);
T := R.GetBytes(22);
R.Free;
```
* On Linux systems TRandom reads from /dev/urandom.
* On Windows systems TRandom uses Windows built in [CryptGenRandom](https://msdn.microsoft.com/en-us/library/windows/desktop/aa379942(v=vs.85).aspx "CryptGenRandom") function.
* On BSD systems TRandom reads from /dev/urandom. (TODO : read from [arc4random_buf](https://www.freebsd.org/cgi/man.cgi?query=arc4random_buf&sektion=3 "arc4random_buf") this is the same on Mac systems, because Mac = FreeBSD)
TRandom will fall back on Free Pascal's [Random](http://www.freepascal.org/docs-html/rtl/system/random.html "Random") function which uses the [Mersenne Twister](https://en.wikipedia.org/wiki/Mersenne_Twister "Mersenne Twister") algorithm to get random bytes.

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{*******************************************************}
{ }
{ 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. }
{ }
{ Foobar 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 | -__| | -__| _ | _ | _ | -__| }
{ |. _ |_____|__|__|_____|___ |___._|_____|_____| }
{ |: | | |_____| }
{ |::.|:. | }
{ `--- ---' }
{*******************************************************}
{ ???: Todo - use arc4random_buf }
{$mode objfpc}{$H+}
Unit Renegade.Random.BSDRandom;
interface
uses
Objects,
Classes,
SysUtils,
Renegade.Random.RandomInterface,
Renegade.Random.URandom;
type
PBSDRandom = ^BSDRandom;
BSDRandom = class (RandomTrait, RandomInterface)
public
function GetBytes(NBytes : SizeUInt) : TBytes;
function GetString(NBytes : SizeUInt) : AnsiString;
end;
implementation
function BSDRandom.GetBytes(NBytes : SizeUInt) : TBytes;
var
RandomBuffer : AnsiString;
begin
SetLength(Result, NBytes);
RandomBuffer := GetString(NBytes);
Move(RandomBuffer[1], Result[0], NBytes);
end;
function BSDRandom.GetString(NBytes : SizeUInt) : AnsiString;
var
TURandom : URandom;
begin
TURandom := URandom.Create;
SetLength(Result, NBytes);
Result := TURandom.GetString(NBytes);
end;
end.

77
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{*******************************************************}
{ }
{ 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. }
{ }
{ Foobar 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.Generic;
interface
uses
Objects,
Classes,
SysUtils,
Renegade.Random.RandomInterface;
type
PRandomGeneric = ^RandomGeneric;
RandomGeneric = class (RandomTrait, RandomInterface)
public
function GetBytes(NBytes : SizeUInt) : TBytes;
function GetString(NBytes : SizeUInt) : AnsiString;
end;
implementation
function RandomGeneric.GetBytes(NBytes : SizeUInt) : TBytes;
var
RandomBuffer : AnsiString;
begin
SetLength(Result, NBytes);
RandomBuffer := GetString(NBytes);
Move(RandomBuffer[1], Result[0], NBytes);
end;
function RandomGeneric.GetString(NBytes : SizeUInt) : AnsiString;
var
ByteBuffer : TBytes;
begin
SetLength(Result, NBytes);
SetLength(ByteBuffer, (NBytes*2));
ByteBuffer := MTRandomBytes((NBytes*2));
Move(ByteBuffer[0], Result[1], NBytes);
end;
end.

86
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{*******************************************************}
{ }
{ 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. }
{ }
{ Foobar 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+}
{$interfaces corba}
{$codepage UTF8}
Unit Renegade.Random.RandomInterface;
interface
uses
Classes,
SysUtils;
type
RandomInterface = interface
['{0750E585-C1D2-4C1F-A8A4-4EDC41847396}']
function GetBytes(NBytes : SizeUInt) : TBytes;
function GetString(NBytes : SizeUInt) : AnsiString;
end;
RandomTrait = class (TObject)
public
constructor Create;
destructor Destroy; override;
function MTRandomBytes(NBytes : SizeUInt) : TBytes; virtual;
end;
implementation
constructor RandomTrait.Create;
begin
inherited Create;
end;
destructor RandomTrait.Destroy;
begin
inherited Destroy;
end;
function RandomTrait.MTRandomBytes(NBytes : SizeUInt) : TBytes;
var
i : SizeUint;
begin
Randomize;
SetLength(Result, (NBytes*2));
for i := 0 to (NBytes*2) do
begin
Result[i] := Random(MaxInt) mod 256;
end;
SetLength(Result, NBytes);
end;
end.

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{*******************************************************}
{ }
{ 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. }
{ }
{ Foobar 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.URandom;
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;
PURandom = ^URandom;
URandom = 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 URandom.GetSystemBytes(var RandomByteBuffer : TBytes; NBytes : SizeUint) : CInt;
var
RandomCharBuffer : PCChar;
Return : CInt;
begin
Writeln(SYS_getrandom);
GetMem(RandomCharBuffer, NBytes);
Return := syscall(SYS_getrandom, @RandomCharBuffer^, NBytes, GRND_DEFAULT);
Move(RandomCharBuffer[0], RandomByteBuffer[0], NBytes);
FreeMem(RandomCharBuffer);
Result := Return;
end;
function URandom.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 URandom.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.

119
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{*******************************************************}
{ }
{ 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.WinRandom;
interface
uses
Objects,
Classes,
SysUtils,
Windows,
Renegade.Random.RandomInterface;
const
CRYPT_VERIFYCONTEXT = $F0000000;
CRYPT_MACHINE_KEYSET = 32;
PROV_RSA_FULL = 1;
CRYPT_NEWKEYSET = 8;
type
HCRYPTPROV = ULONG_PTR;
PWinRandom = ^WinRandom;
WinRandom = class (RandomTrait, RandomInterface)
public
function GetBytes(NBytes : SizeUInt) : TBytes;
function GetString(NBytes : SizeUInt) : AnsiString;
end;
function CryptAcquireContextW(var phProv: HCRYPTPROV; pszContainer: LPCTSTR;
pszProvider: LPCTSTR; dwProvType: DWORD; dwFlags: DWORD): BOOL;stdcall; external 'advapi32' name 'CryptAcquireContextW';
function CryptGenRandom(hProv: HCRYPTPROV; dwLen: DWORD;
var pbBuffer: BYTE): BOOL; stdcall; external 'advapi32' name 'CryptGenRandom';
implementation
function WinRandom.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 WinRandom.GetString(NBytes : SizeUInt) : AnsiString;
var
RandomBuffer : ^BYTE;
hCryptProv : ^ULONG_PTR;
WinCrypt : Boolean;
ReturnString : AnsiString;
i, Bytes : SizeInt;
ReturnBytes : TBytes;
begin
GetMem(RandomBuffer, (NBytes * 2));
CryptAcquireContextW(hCryptProv^, nil, nil, PROV_RSA_FULL,
CRYPT_NEWKEYSET or CRYPT_MACHINE_KEYSET or CRYPT_VERIFYCONTEXT );
WinCrypt := CryptGenRandom(hCryptProv^, (NBytes * 2), RandomBuffer^);
SetLength(ReturnString, (NBytes*2));
if WinCrypt then
begin
for i := 1 to (NBytes*2) do
begin
ReturnString[i] := Chr(RandomBuffer[i]);
end;
end else
begin
SetLength(ReturnBytes, (NBytes*2));
ReturnBytes := MTRandomBytes((NBytes*2));
end;
SetLength(Result, NBytes);
FreeMem(RandomBuffer, (NBytes * 2));
if WinCrypt then
begin
Move(ReturnString[1], Result[1], NBytes);
end else
begin
Move(ReturnBytes[0], Result[1], NBytes);
end;
end;
end.

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{*******************************************************}
{ }
{ 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. }
{ }
{ Foobar 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+}
{$interfaces corba}
Unit Renegade.Random;
interface
uses
Objects,
Classes,
SysUtils,
Renegade.Random.RandomInterface,
{$IF DEFINED(LINUX)}
Renegade.Random.URandom
{$ELSEIF DEFINED(WINDOWS)}
Renegade.Random.WinRandom
{$ELSEIF DEFINED(BSD)}
Renegade.Random.BSDRandom
{$ELSE}
Renegade.Random.Generic;
{$ENDIF}
;
type
PRandom = ^TRandom;
TRandom = class (RandomTrait, RandomInterface)
private
FRandomGenerator : RandomInterface;
procedure SetRandomGenerator(GeneratorClass : RandomInterface);
public
constructor Init;
destructor Destroy; override;
procedure SetDefaultGenerator;
function GetBytes(NBytes : SizeUInt) : TBytes;
function GetString(NBytes : SizeUInt) : AnsiString;
property RandomGenerator : RandomInterface read FRandomGenerator write SetRandomGenerator;
end;
implementation
constructor TRandom.Init;
begin
SetDefaultGenerator;
end;
destructor TRandom.Destroy;
begin
inherited Destroy;
end;
procedure TRandom.SetRandomGenerator(GeneratorClass : RandomInterface);
begin
FRandomGenerator := GeneratorClass;
end;
procedure TRandom.SetDefaultGenerator;
begin
{$IF DEFINED(LINUX)}
FRandomGenerator := URandom.Create;
{$ELSEIF DEFINED(WINDOWS)}
FRandomGenerator := WinRandom.Create;
{$ELSEIF DEFINED(BSD)}
FRandomGenerator := BSDRandom.Create;
{$ELSE}
FRandomGenerator := RandomGeneric.Create;
{$ENDIF}
end;
function TRandom.GetBytes(NBytes : SizeUInt) : TBytes;
begin
SetLength(Result, NBytes);
Result := FRandomGenerator.GetBytes(NBytes);
end;
function TRandom.GetString(NBytes : SizeUInt) : AnsiString;
begin
SetLength(Result, NBytes);
Result := FRandomGenerator.GetString(NBytes);
end;
end.

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test:
fpc -Fu../ RandomTest.pas
clean:
rm *.o; rm RandomTest;

74
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{$ASSERTIONS ON}
{$mode objfpc}{$H+}
Program RandomTest;
Uses
Renegade.Random,
Renegade.Random.Generic,
Renegade.Random.RandomInterface,
Classes,
SysUtils;
var
S : AnsiString;
T : TBytes;
RRandom : TRandom;
i : Byte;
begin
SetLength(S, 22);
SetLength(T, 22);
{ Custom random generator }
RRandom := TRandom.Init;
Assert(RRandom.InheritsFrom(RandomTrait));
RRandom.RandomGenerator := RandomGeneric.Create;
Assert(RRandom.InheritsFrom(RandomTrait));
S := RRandom.GetString(22);
T := RRandom.GetBytes(22);
Writeln(S);
Writeln(Length(S));
Assert(Length(S) = 22);
Assert(High(S) = 22);
Assert(Low(S) = 1);
for i := Low(S) to High(S) do
begin
Assert(S[i] in [#0..#255]);
end;
{ Custom random generator bytes }
Assert(Length(T) = 22);
Assert(High(T) = 21);
Assert(Low(T) = 0);
for i := 0 to High(T) do
begin
Assert(T[i] in [0..255]);
end;
{ Reset to default }
RRandom.SetDefaultGenerator;
S := RRandom.GetString(22);
Assert(Length(S) = 22);
Assert(High(S) = 22);
Assert(Low(S) = 1);
for i := Low(S) to High(S) do
begin
Assert(S[i] in [#0..#255]);
end;
T := RRandom.GetBytes(22);
{ Random Bytes Default Generator }
Assert(Length(T) = 22);
Assert(High(T) = 21);
Assert(Low(T) = 0);
for i := 0 to High(T) do
begin
Assert(T[i] in [0..255]);
end;
RRandom.Free;
try // Check for access violation after free.
RRandom.GetString(22);
except
on e: Exception do
begin
Assert(e.ClassNameIs('EAccessViolation'));
Assert(e.Message = 'Access violation');
end;
end;
end.