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https://github.com/doublecmd/doublecmd.git
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121 lines
3.2 KiB
ObjectPascal
121 lines
3.2 KiB
ObjectPascal
{
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Double Commander
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-------------------------------------------------------------------------
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Cryptographically secure pseudo-random number generator
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Copyright (C) 2017 Alexander Koblov (alexx2000@mail.ru)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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}
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unit uRandom;
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{$mode delphi}
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interface
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procedure Random(ABlock: PByte; ACount: Integer);
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implementation
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uses
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ISAAC
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{$IF DEFINED(MSWINDOWS)}
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, Windows
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{$ELSEIF DEFINED(UNIX)}
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, DCOSUtils
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{$IF DEFINED(LINUX)}
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, dl, BaseUnix, InitC
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{$ENDIF}
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{$ENDIF}
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, SysUtils
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{$IF (FPC_FULLVERSION < 30000)}
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, LazUTF8SysUtils
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{$ENDIF}
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;
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threadvar
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Context: isaac_ctx;
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{$IF DEFINED(MSWINDOWS)}
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var
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RtlGenRandom: function(RandomBuffer: PByte; RandomBufferLength: ULONG): LongBool; stdcall;
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{$ELSEIF DEFINED(UNIX)}
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const
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random_dev = '/dev/urandom';
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var
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HasRandom: Boolean = False;
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{$IF DEFINED(LINUX)}
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getrandom: function(buf: PByte; buflen: csize_t; flags: cuint): cint; cdecl;
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{$ENDIF}
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{$ENDIF}
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procedure Random(ABlock: PByte; ACount: Integer);
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var
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{$IF DEFINED(UNIX)}
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Handle: THandle;
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{$ENDIF}
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Result: Boolean = False;
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begin
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{$IF DEFINED(MSWINDOWS)}
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Result:= Assigned(RtlGenRandom);
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if Result then Result:= RtlGenRandom(ABlock, ACount);
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{$ELSEIF DEFINED(UNIX)} {$IF DEFINED(LINUX)}
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if Assigned(getrandom) then
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begin
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repeat
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Result:= (getrandom(ABlock, ACount, 0) = ACount);
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until (Result = True) or (fpgetCerrno <> ESysEINTR);
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end;
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if not Result then
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{$ENDIF}
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if HasRandom then
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begin
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Handle:= mbFileOpen(random_dev, fmOpenRead or fmShareDenyNone);
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Result:= (Handle <> feInvalidHandle);
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if Result then
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begin
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Result:= (FileRead(Handle, ABlock^, ACount) = ACount);
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FileClose(Handle);
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end;
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end;
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{$ENDIF}
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if not Result then
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begin
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if (Context.randidx = 0) then
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begin
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isaac_inita({%H-}Context, [Int32(GetTickCount64),
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Integer(GetThreadID),
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Integer(GetProcessID),
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GetHeapStatus.TotalFree,
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Int32(Trunc(Now * MSecsPerDay))], 5);
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end;
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isaac_read(Context, ABlock, ACount);
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end;
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end;
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initialization
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{$IF DEFINED(MSWINDOWS)}
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@RtlGenRandom:= GetProcAddress(GetModuleHandle('advapi32.dll'), 'SystemFunction036');
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{$ELSEIF DEFINED(UNIX)}
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HasRandom:= mbFileAccess(random_dev, fmOpenRead);
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{$IF DEFINED(LINUX)}
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@getrandom:= dlsym(dlopen('libc.so.6', RTLD_NOW), 'getrandom');
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{$ENDIF}
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{$ENDIF}
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end.
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