?? dcpcast128.pas

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           cast_sbox7[t[2] shr 24] xor cast_sbox8[(t[2] shr 16) and $FF];
          KeyData[i+3]:= cast_sbox5[(t[1] shr 16) and $FF] xor cast_sbox6[t[1] shr 24] xor
           cast_sbox7[(t[2] shr 8) and $FF] xor cast_sbox8[t[2] and $FF];
        end;
    end;
    case (i and 12) of
      0:
        begin
          KeyData[i+0]:= KeyData[i+0] xor cast_sbox5[(z[0] shr 8) and $FF];
          KeyData[i+1]:= KeyData[i+1] xor cast_sbox6[(z[1] shr 8) and $FF];
          KeyData[i+2]:= KeyData[i+2] xor cast_sbox7[(z[2] shr 16) and $FF];
          KeyData[i+3]:= KeyData[i+3] xor cast_sbox8[z[3] shr 24];
        end;
      4:
        begin
          KeyData[i+0]:= KeyData[i+0] xor cast_sbox5[x[2] shr 24];
          KeyData[i+1]:= KeyData[i+1] xor cast_sbox6[(x[3] shr 16) and $FF];
          KeyData[i+2]:= KeyData[i+2] xor cast_sbox7[x[0] and $FF];
          KeyData[i+3]:= KeyData[i+3] xor cast_sbox8[x[1] and $FF];
        end;
      8:
        begin
          KeyData[i+0]:= KeyData[i+0] xor cast_sbox5[(z[2] shr 16) and $FF];
          KeyData[i+1]:= KeyData[i+1] xor cast_sbox6[z[3] shr 24];
          KeyData[i+2]:= KeyData[i+2] xor cast_sbox7[(z[0] shr 8) and $FF];
          KeyData[i+3]:= KeyData[i+3] xor cast_sbox8[(z[1] shr 8) and $FF];
        end;
      12:
        begin
          KeyData[i+0]:= KeyData[i+0] xor cast_sbox5[x[0] and $FF];
          KeyData[i+1]:= KeyData[i+1] xor cast_sbox6[x[1] and $FF];
          KeyData[i+2]:= KeyData[i+2] xor cast_sbox7[x[2] shr 24];
          KeyData[i+3]:= KeyData[i+3] xor cast_sbox8[(x[3] shr 16) and $FF];
        end;
    end;
    if (i >= 16) then
    begin
      KeyData[i+0]:= KeyData[i+0] and 31;
      KeyData[i+1]:= KeyData[i+1] and 31;
      KeyData[i+2]:= KeyData[i+2] and 31;
      KeyData[i+3]:= KeyData[i+3] and 31;
    end;
    Inc(i,4);
  end;
end;

procedure TDCP_cast128.Burn;
begin
  FillChar(KeyData,Sizeof(KeyData),$FF);
  Rounds:= 0;
  inherited Burn;
end;

procedure TDCP_cast128.EncryptECB(const InData; var OutData);
var
  t, l, r: DWord;
begin
  if not fInitialized then
    raise EDCP_blockcipher.Create('Cipher not initialized');
  l:= Pdword(@InData)^;
  r:= Pdword(longword(@InData)+4)^;
  l:= (l shr 24) or ((l shr 8) and $FF00) or ((l shl 8) and $FF0000) or (l shl 24);
  r:= (r shr 24) or ((r shr 8) and $FF00) or ((r shl 8) and $FF0000) or (r shl 24);
  t:= LRot32(KeyData[0]+r, KeyData[0+16]);
  l:= l xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
    cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[1] xor l, KeyData[1+16]);
  r:= r xor (((cast_sbox1[t shr 24] - cast_sbox2[(t shr 16) and $FF]) +
    cast_sbox3[(t shr 8) and $FF]) xor cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[2]-r, KeyData[2+16]);
  l:= l xor (((cast_sbox1[t shr 24] + cast_sbox2[(t shr 16) and $FF]) xor
    cast_sbox3[(t shr 8) and $FF]) - cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[3]+l, KeyData[3+16]);
  r:= r xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
    cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[4] xor r, KeyData[4+16]);
  l:= l xor (((cast_sbox1[t shr 24] - cast_sbox2[(t shr 16) and $FF]) +
    cast_sbox3[(t shr 8) and $FF]) xor cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[5]-l, KeyData[5+16]);
  r:= r xor (((cast_sbox1[t shr 24] + cast_sbox2[(t shr 16) and $FF]) xor
    cast_sbox3[(t shr 8) and $FF]) - cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[6]+r, KeyData[6+16]);
  l:= l xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
    cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[7] xor l, KeyData[7+16]);
  r:= r xor (((cast_sbox1[t shr 24] - cast_sbox2[(t shr 16) and $FF]) +
    cast_sbox3[(t shr 8) and $FF]) xor cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[8]-r, KeyData[8+16]);
  l:= l xor (((cast_sbox1[t shr 24] + cast_sbox2[(t shr 16) and $FF]) xor
    cast_sbox3[(t shr 8) and $FF]) - cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[9]+l, KeyData[9+16]);
  r:= r xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
    cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[10] xor r, KeyData[10+16]);
  l:= l xor (((cast_sbox1[t shr 24] - cast_sbox2[(t shr 16) and $FF]) +
    cast_sbox3[(t shr 8) and $FF]) xor cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[11]-l, KeyData[11+16]);
  r:= r xor (((cast_sbox1[t shr 24] + cast_sbox2[(t shr 16) and $FF]) xor
    cast_sbox3[(t shr 8) and $FF]) - cast_sbox4[t and $FF]);
  if Rounds> 12 then
  begin
    t:= LRot32(KeyData[12]+r, KeyData[12+16]);
    l:= l xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
      cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
    t:= LRot32(KeyData[13] xor l, KeyData[13+16]);
    r:= r xor (((cast_sbox1[t shr 24] - cast_sbox2[(t shr 16) and $FF]) +
      cast_sbox3[(t shr 8) and $FF]) xor cast_sbox4[t and $FF]);
    t:= LRot32(KeyData[14]-r, KeyData[14+16]);
    l:= l xor (((cast_sbox1[t shr 24] + cast_sbox2[(t shr 16) and $FF]) xor
      cast_sbox3[(t shr 8) and $FF]) - cast_sbox4[t and $FF]);
    t:= LRot32(KeyData[15]+l, KeyData[15+16]);
    r:= r xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
      cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
  end;
  l:= (l shr 24) or ((l shr 8) and $FF00) or ((l shl 8) and $FF0000) or (l shl 24);
  r:= (r shr 24) or ((r shr 8) and $FF00) or ((r shl 8) and $FF0000) or (r shl 24);
  Pdword(@OutData)^:= r;
  Pdword(longword(@OutData)+4)^:= l;
end;

procedure TDCP_cast128.DecryptECB(const InData; var OutData);
var
  t, l, r: DWord;
begin
  if not fInitialized then
    raise EDCP_blockcipher.Create('Cipher not initialized');
  r:= Pdword(@InData)^;
  l:= Pdword(longword(@InData)+4)^;
  l:= (l shr 24) or ((l shr 8) and $FF00) or ((l shl 8) and $FF0000) or (l shl 24);
  r:= (r shr 24) or ((r shr 8) and $FF00) or ((r shl 8) and $FF0000) or (r shl 24);
  if Rounds> 12 then
  begin
    t:= LRot32(KeyData[15]+l, KeyData[15+16]);
    r:= r xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
      cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
    t:= LRot32(KeyData[14]-r, KeyData[14+16]);
    l:= l xor (((cast_sbox1[t shr 24] + cast_sbox2[(t shr 16) and $FF]) xor
      cast_sbox3[(t shr 8) and $FF]) - cast_sbox4[t and $FF]);
    t:= LRot32(KeyData[13] xor l, KeyData[13+16]);
    r:= r xor (((cast_sbox1[t shr 24] - cast_sbox2[(t shr 16) and $FF]) +
      cast_sbox3[(t shr 8) and $FF]) xor cast_sbox4[t and $FF]);
    t:= LRot32(KeyData[12]+r, KeyData[12+16]);
    l:= l xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
      cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
  end;
  t:= LRot32(KeyData[11]-l, KeyData[11+16]);
  r:= r xor (((cast_sbox1[t shr 24] + cast_sbox2[(t shr 16) and $FF]) xor
    cast_sbox3[(t shr 8) and $FF]) - cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[10] xor r, KeyData[10+16]);
  l:= l xor (((cast_sbox1[t shr 24] - cast_sbox2[(t shr 16) and $FF]) +
    cast_sbox3[(t shr 8) and $FF]) xor cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[9]+l, KeyData[9+16]);
  r:= r xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
    cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[8]-r, KeyData[8+16]);
  l:= l xor (((cast_sbox1[t shr 24] + cast_sbox2[(t shr 16) and $FF]) xor
    cast_sbox3[(t shr 8) and $FF]) - cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[7] xor l, KeyData[7+16]);
  r:= r xor (((cast_sbox1[t shr 24] - cast_sbox2[(t shr 16) and $FF]) +
    cast_sbox3[(t shr 8) and $FF]) xor cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[6]+r, KeyData[6+16]);
  l:= l xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
    cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[5]-l, KeyData[5+16]);
  r:= r xor (((cast_sbox1[t shr 24] + cast_sbox2[(t shr 16) and $FF]) xor
    cast_sbox3[(t shr 8) and $FF]) - cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[4] xor r, KeyData[4+16]);
  l:= l xor (((cast_sbox1[t shr 24] - cast_sbox2[(t shr 16) and $FF]) +
    cast_sbox3[(t shr 8) and $FF]) xor cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[3]+l, KeyData[3+16]);
  r:= r xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
    cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[2]-r, KeyData[2+16]);
  l:= l xor (((cast_sbox1[t shr 24] + cast_sbox2[(t shr 16) and $FF]) xor
    cast_sbox3[(t shr 8) and $FF]) - cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[1] xor l, KeyData[1+16]);
  r:= r xor (((cast_sbox1[t shr 24] - cast_sbox2[(t shr 16) and $FF]) +
    cast_sbox3[(t shr 8) and $FF]) xor cast_sbox4[t and $FF]);
  t:= LRot32(KeyData[0]+r, KeyData[0+16]);
  l:= l xor (((cast_sbox1[t shr 24] xor cast_sbox2[(t shr 16) and $FF]) -
    cast_sbox3[(t shr 8) and $FF]) + cast_sbox4[t and $FF]);
  l:= (l shr 24) or ((l shr 8) and $FF00) or ((l shl 8) and $FF0000) or (l shl 24);
  r:= (r shr 24) or ((r shr 8) and $FF00) or ((r shl 8) and $FF0000) or (r shl 24);
  Pdword(@OutData)^:= l;
  Pdword(longword(@OutData)+4)^:= r;
end;


end.
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?? dcpcast128.pas

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