{******************************************************************************}
{* DCPcrypt v2.0 written by David Barton (crypto@cityinthesky.co.uk) **********}
{******************************************************************************}
{* A binary compatible implementation of BLAKE2S and BLAKE2SP *****************}
{******************************************************************************}
{* Copyright (C) 2014-2015 Alexander Koblov (alexx2000@mail.ru)               *}
{* Permission is hereby granted, free of charge, to any person obtaining a    *}
{* copy of this software and associated documentation files (the "Software"), *}
{* to deal in the Software without restriction, including without limitation  *}
{* the rights to use, copy, modify, merge, publish, distribute, sublicense,   *}
{* and/or sell copies of the Software, and to permit persons to whom the      *}
{* Software is furnished to do so, subject to the following conditions:       *}
{*                                                                            *}
{* The above copyright notice and this permission notice shall be included in *}
{* all copies or substantial portions of the Software.                        *}
{*                                                                            *}
{* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *}
{* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,   *}
{* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL    *}
{* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *}
{* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING    *}
{* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER        *}
{* DEALINGS IN THE SOFTWARE.                                                  *}
{******************************************************************************}
unit DCPblake2;

{$mode delphi}

interface

uses
  Classes, SysUtils, CTypes, DCPcrypt2, DCPconst, DCblake2;

type

  { TDCP_blake2s }

  TDCP_blake2s = class(TDCP_hash)
  protected
    S: blake2s_state;
  public
    class function GetId: integer; override;
    class function GetAlgorithm: string; override;
    class function GetHashSize: integer; override;
    class function SelfTest: boolean; override;
    procedure Init; override;
    procedure Burn; override;
    procedure Update(const Buffer; Size: longword); override;
    procedure Final(var Digest); override;
  end;

  { TDCP_blake2sp }

  TDCP_blake2sp = class(TDCP_hash)
  protected
    S: blake2sp_state;
  public
    class function GetId: integer; override;
    class function GetAlgorithm: string; override;
    class function GetHashSize: integer; override;
    class function SelfTest: boolean; override;
    procedure Init; override;
    procedure Burn; override;
    procedure Update(const Buffer; Size: longword); override;
    procedure Final(var Digest); override;
  end;

implementation

{ TDCP_blake2s }

class function TDCP_blake2s.GetId: integer;
begin
  Result:= DCP_blake2s;
end;

class function TDCP_blake2s.GetAlgorithm: string;
begin
  Result:= 'BLAKE2S';
end;

class function TDCP_blake2s.GetHashSize: integer;
begin
  Result:= 256;
end;

class function TDCP_blake2s.SelfTest: boolean;
const
  Test1Out: array[0..31] of byte=
    ($50, $8c, $5e, $8c, $32, $7c, $14, $e2, $e1, $a7, $2b, $a3, $4e, $eb, $45, $2f,
     $37, $45, $8b, $20, $9e, $d6, $3a, $29, $4d, $99, $9b, $4c, $86, $67, $59, $82);
  Test2Out: array[0..31] of byte=
    ($6f, $4d, $f5, $11, $6a, $6f, $33, $2e, $da, $b1, $d9, $e1, $0e, $e8, $7d, $f6,
     $55, $7b, $ea, $b6, $25, $9d, $76, $63, $f3, $bc, $d5, $72, $2c, $13, $f1, $89 );
var
  TestHash: TDCP_blake2s;
  TestOut: array[0..31] of byte;
begin
  dcpFillChar(TestOut, SizeOf(TestOut), 0);
  TestHash:= TDCP_blake2s.Create(nil);
  TestHash.Init;
  TestHash.UpdateStr('abc');
  TestHash.Final(TestOut);
  Result:= boolean(CompareMem(@TestOut,@Test1Out,Sizeof(Test1Out)));
  TestHash.Init;
  TestHash.UpdateStr('abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq');
  TestHash.Final(TestOut);
  Result:= boolean(CompareMem(@TestOut,@Test2Out,Sizeof(Test2Out))) and Result;
  TestHash.Free;
end;

procedure TDCP_blake2s.Init;
begin
  if blake2s_init( @S, BLAKE2S_OUTBYTES ) < 0 then
    raise EDCP_hash.Create('blake2s_init');
  fInitialized:= true;
end;

procedure TDCP_blake2s.Burn;
begin
  fInitialized:= false;
end;

procedure TDCP_blake2s.Update(const Buffer; Size: longword);
var
  Bytes: PByte;
begin
  Bytes:= @Buffer;
  if blake2s_update(@S, Bytes, Size) < 0 then
    raise EDCP_hash.Create('blake2s_update');
end;

procedure TDCP_blake2s.Final(var Digest);
var
  Hash: array[0..Pred(BLAKE2S_OUTBYTES)] of cuint8;
begin
  if not fInitialized then
    raise EDCP_hash.Create('Hash not initialized');
  if blake2s_final(@S, Hash, SizeOf(Hash)) < 0 then
    raise EDCP_hash.Create('blake2s_final');
  Move(Hash, Digest, Sizeof(Hash));
  Burn;
end;

{ TDCP_blake2sp }

class function TDCP_blake2sp.GetId: integer;
begin
  Result:= DCP_blake2sp;
end;

class function TDCP_blake2sp.GetAlgorithm: string;
begin
  Result:= 'BLAKE2SP';
end;

class function TDCP_blake2sp.GetHashSize: integer;
begin
  Result:= 256;
end;

class function TDCP_blake2sp.SelfTest: boolean;
const
  Test1Out: array[0..31] of byte=
    ($70, $f7, $5b, $58, $f1, $fe, $ca, $b8, $21, $db, $43, $c8, $8a, $d8, $4e, $dd,
     $e5, $a5, $26, $00, $61, $6c, $d2, $25, $17, $b7, $bb, $14, $d4, $40, $a7, $d5);
  Test2Out: array[0..31] of byte=
    ($3d, $10, $7e, $42, $f1, $7c, $13, $c8, $2b, $43, $6e, $bb, $65, $1a, $48, $de,
     $f6, $7e, $77, $72, $fa, $06, $f4, $73, $8e, $e9, $68, $c7, $f4, $d8, $b4, $8b);
var
  TestHash: TDCP_blake2sp;
  TestOut: array[0..31] of byte;
begin
  dcpFillChar(TestOut, SizeOf(TestOut), 0);
  TestHash:= TDCP_blake2sp.Create(nil);
  TestHash.Init;
  TestHash.UpdateStr('abc');
  TestHash.Final(TestOut);
  Result:= boolean(CompareMem(@TestOut,@Test1Out,Sizeof(Test1Out)));
  TestHash.Init;
  TestHash.UpdateStr('abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq');
  TestHash.Final(TestOut);
  Result:= boolean(CompareMem(@TestOut,@Test2Out,Sizeof(Test2Out))) and Result;
  TestHash.Free;
end;

procedure TDCP_blake2sp.Init;
begin
  if blake2sp_init( @S, BLAKE2S_OUTBYTES ) < 0 then
    raise EDCP_hash.Create('blake2sp_init');
  fInitialized:= true;
end;

procedure TDCP_blake2sp.Burn;
begin
  fInitialized:= false;
end;

procedure TDCP_blake2sp.Update(const Buffer; Size: longword);
var
  Bytes: PByte;
begin
  Bytes:= @Buffer;
  if blake2sp_update(@S, Bytes, Size) < 0 then
    raise EDCP_hash.Create('blake2sp_update');
end;

procedure TDCP_blake2sp.Final(var Digest);
var
  Hash: array[0..Pred(BLAKE2S_OUTBYTES)] of cuint8;
begin
  if not fInitialized then
    raise EDCP_hash.Create('Hash not initialized');
  if blake2sp_final(@S, Hash, SizeOf(Hash)) < 0 then
    raise EDCP_hash.Create('blake2sp_final');
  Move(Hash, Digest, Sizeof(Hash));
  Burn;
end;

end.