dcpsha256.pas

delphi下一整套加密组件

  t1:= b + (((g shr 6) or (g shl 26)) xor ((g shr 11) or (g shl 21)) xor ((g shr 25) or (g shl 7))) + ((g and h) xor (not g and a)) + $5b9cca4f + W[54]; t2:= (((c shr 2) or (c shl 30)) xor ((c shr 13) or (c shl 19)) xor ((c shr 22) xor (c shl 10))) + ((c and d) xor (c and e) xor (d and e)); b:= t1 + t2; f:= f + t1;
  t1:= a + (((f shr 6) or (f shl 26)) xor ((f shr 11) or (f shl 21)) xor ((f shr 25) or (f shl 7))) + ((f and g) xor (not f and h)) + $682e6ff3 + W[55]; t2:= (((b shr 2) or (b shl 30)) xor ((b shr 13) or (b shl 19)) xor ((b shr 22) xor (b shl 10))) + ((b and c) xor (b and d) xor (c and d)); a:= t1 + t2; e:= e + t1;
  t1:= h + (((e shr 6) or (e shl 26)) xor ((e shr 11) or (e shl 21)) xor ((e shr 25) or (e shl 7))) + ((e and f) xor (not e and g)) + $748f82ee + W[56]; t2:= (((a shr 2) or (a shl 30)) xor ((a shr 13) or (a shl 19)) xor ((a shr 22) xor (a shl 10))) + ((a and b) xor (a and c) xor (b and c)); h:= t1 + t2; d:= d + t1;
  t1:= g + (((d shr 6) or (d shl 26)) xor ((d shr 11) or (d shl 21)) xor ((d shr 25) or (d shl 7))) + ((d and e) xor (not d and f)) + $78a5636f + W[57]; t2:= (((h shr 2) or (h shl 30)) xor ((h shr 13) or (h shl 19)) xor ((h shr 22) xor (h shl 10))) + ((h and a) xor (h and b) xor (a and b)); g:= t1 + t2; c:= c + t1;
  t1:= f + (((c shr 6) or (c shl 26)) xor ((c shr 11) or (c shl 21)) xor ((c shr 25) or (c shl 7))) + ((c and d) xor (not c and e)) + $84c87814 + W[58]; t2:= (((g shr 2) or (g shl 30)) xor ((g shr 13) or (g shl 19)) xor ((g shr 22) xor (g shl 10))) + ((g and h) xor (g and a) xor (h and a)); f:= t1 + t2; b:= b + t1;
  t1:= e + (((b shr 6) or (b shl 26)) xor ((b shr 11) or (b shl 21)) xor ((b shr 25) or (b shl 7))) + ((b and c) xor (not b and d)) + $8cc70208 + W[59]; t2:= (((f shr 2) or (f shl 30)) xor ((f shr 13) or (f shl 19)) xor ((f shr 22) xor (f shl 10))) + ((f and g) xor (f and h) xor (g and h)); e:= t1 + t2; a:= a + t1;
  t1:= d + (((a shr 6) or (a shl 26)) xor ((a shr 11) or (a shl 21)) xor ((a shr 25) or (a shl 7))) + ((a and b) xor (not a and c)) + $90befffa + W[60]; t2:= (((e shr 2) or (e shl 30)) xor ((e shr 13) or (e shl 19)) xor ((e shr 22) xor (e shl 10))) + ((e and f) xor (e and g) xor (f and g)); d:= t1 + t2; h:= h + t1;
  t1:= c + (((h shr 6) or (h shl 26)) xor ((h shr 11) or (h shl 21)) xor ((h shr 25) or (h shl 7))) + ((h and a) xor (not h and b)) + $a4506ceb + W[61]; t2:= (((d shr 2) or (d shl 30)) xor ((d shr 13) or (d shl 19)) xor ((d shr 22) xor (d shl 10))) + ((d and e) xor (d and f) xor (e and f)); c:= t1 + t2; g:= g + t1;
  t1:= b + (((g shr 6) or (g shl 26)) xor ((g shr 11) or (g shl 21)) xor ((g shr 25) or (g shl 7))) + ((g and h) xor (not g and a)) + $bef9a3f7 + W[62]; t2:= (((c shr 2) or (c shl 30)) xor ((c shr 13) or (c shl 19)) xor ((c shr 22) xor (c shl 10))) + ((c and d) xor (c and e) xor (d and e)); b:= t1 + t2; f:= f + t1;
  t1:= a + (((f shr 6) or (f shl 26)) xor ((f shr 11) or (f shl 21)) xor ((f shr 25) or (f shl 7))) + ((f and g) xor (not f and h)) + $c67178f2 + W[63]; t2:= (((b shr 2) or (b shl 30)) xor ((b shr 13) or (b shl 19)) xor ((b shr 22) xor (b shl 10))) + ((b and c) xor (b and d) xor (c and d)); a:= t1 + t2; e:= e + t1;

  CurrentHash[0]:= CurrentHash[0] + a;
  CurrentHash[1]:= CurrentHash[1] + b;
  CurrentHash[2]:= CurrentHash[2] + c;
  CurrentHash[3]:= CurrentHash[3] + d;
  CurrentHash[4]:= CurrentHash[4] + e;
  CurrentHash[5]:= CurrentHash[5] + f;
  CurrentHash[6]:= CurrentHash[6] + g;
  CurrentHash[7]:= CurrentHash[7] + h;
  FillChar(W,Sizeof(W),0);
  FillChar(HashBuffer,Sizeof(HashBuffer),0);
end;

class function TDCP_sha256.GetAlgorithm: string;
begin
  Result:= 'SHA256';
end;

class function TDCP_sha256.GetId: integer;
begin
  Result:= DCP_sha256;
end;

class function TDCP_sha256.GetHashSize: integer;
begin
  Result:= 256;
end;

class function TDCP_sha256.SelfTest: boolean;
const
  Test1Out: array[0..31] of byte=
    ($ba,$78,$16,$bf,$8f,$01,$cf,$ea,$41,$41,$40,$de,$5d,$ae,$22,$23,
     $b0,$03,$61,$a3,$96,$17,$7a,$9c,$b4,$10,$ff,$61,$f2,$00,$15,$ad);
  Test2Out: array[0..31] of byte=
    ($24,$8d,$6a,$61,$d2,$06,$38,$b8,$e5,$c0,$26,$93,$0c,$3e,$60,$39,
     $a3,$3c,$e4,$59,$64,$ff,$21,$67,$f6,$ec,$ed,$d4,$19,$db,$06,$c1);
var
  TestHash: TDCP_sha256;
  TestOut: array[0..31] of byte;
begin
  TestHash:= TDCP_sha256.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_sha256.Init;
begin
  Burn;
  CurrentHash[0]:= $6a09e667;
  CurrentHash[1]:= $bb67ae85;
  CurrentHash[2]:= $3c6ef372;
  CurrentHash[3]:= $a54ff53a;
  CurrentHash[4]:= $510e527f;
  CurrentHash[5]:= $9b05688c;
  CurrentHash[6]:= $1f83d9ab;
  CurrentHash[7]:= $5be0cd19;
  fInitialized:= true;
end;

procedure TDCP_sha256.Burn;
begin
  LenHi:= 0; LenLo:= 0;
  Index:= 0;
  FillChar(HashBuffer,Sizeof(HashBuffer),0);
  FillChar(CurrentHash,Sizeof(CurrentHash),0);
  fInitialized:= false;
end;

procedure TDCP_sha256.Update(const Buffer; Size: longword);
var
  PBuf: ^byte;
begin
  if not fInitialized then
    raise EDCP_hash.Create('Hash not initialized');

  Inc(LenHi,Size shr 29);
  Inc(LenLo,Size*8);
  if LenLo< (Size*8) then
    Inc(LenHi);

  PBuf:= @Buffer;
  while Size> 0 do
  begin
    if (Sizeof(HashBuffer)-Index)<= DWord(Size) then
    begin
      Move(PBuf^,HashBuffer[Index],Sizeof(HashBuffer)-Index);
      Dec(Size,Sizeof(HashBuffer)-Index);
      Inc(PBuf,Sizeof(HashBuffer)-Index);
      Compress;
    end
    else
    begin
      Move(PBuf^,HashBuffer[Index],Size);
      Inc(Index,Size);
      Size:= 0;
    end;
  end;
end;

procedure TDCP_sha256.Final(var Digest);
begin
  if not fInitialized then
    raise EDCP_hash.Create('Hash not initialized');
  HashBuffer[Index]:= $80;
  if Index>= 56 then
    Compress;
  PDWord(@HashBuffer[56])^:= SwapDWord(LenHi);
  PDWord(@HashBuffer[60])^:= SwapDWord(LenLo);
  Compress;
  CurrentHash[0]:= SwapDWord(CurrentHash[0]);
  CurrentHash[1]:= SwapDWord(CurrentHash[1]);
  CurrentHash[2]:= SwapDWord(CurrentHash[2]);
  CurrentHash[3]:= SwapDWord(CurrentHash[3]);
  CurrentHash[4]:= SwapDWord(CurrentHash[4]);
  CurrentHash[5]:= SwapDWord(CurrentHash[5]);
  CurrentHash[6]:= SwapDWord(CurrentHash[6]);
  CurrentHash[7]:= SwapDWord(CurrentHash[7]);
  Move(CurrentHash,Digest,Sizeof(CurrentHash));
  Burn;
end;

end.