encode.pas

破解“国际领先的Nprotect键盘加密技术”

unit Encode;

interface

function  Encrypt(const str: string): string;
function  Decrypt(const str: string): string;

implementation

{#### 加密解密}
const
  fSeedA = 56789;///     常量   ,
  fSeedB = 54667;   ///     常量   ,
  fKey   = 1006;     //     钥匙
function  Encrypt(const str: string): string;
var
      i, j, iKey: Integer;
      strGet: string;
begin
      strGet := str;
      iKey   := FKey;
      Result := strGet;
      for i := 1 to Length(strGet) do
      begin   
          Result[i] := Char(byte(strGet[i])xor(iKey shr 8));
          iKey := (Byte(Result[I]) + iKey) * FSeedA + FSeedB;
      end;   
      strGet := Result;
      Result := '';
      for i:=1 to Length(strGet) do
      begin   
          j := Integer(strGet[i]);
          Result := Result + Char(65+(j div 26))+ char(65+(j mod 26));   
      end;   
end;

function Decrypt(const str: string): string;
  var   
      i, j, iKey: Integer;
      strGet: string;
  begin   
      strGet := str;
      iKey   := FKey;
      Result := '';
      for i := 1 to (Length(strGet) div 2) do
      begin   
          j := (Integer(strGet[2*i-1])-65)*26;
          j := j + (Integer(strGet[2*i])-65);
          Result := Result + Char(j);
      end;   
      strGet := Result;
      for i := 1 to Length(strGet) do
      begin   
          Result[i] := Char(byte(strGet[I]) xor (iKey shr 8));
          iKey := (Byte(strGet[I]) + iKey) * FSeedA + FSeedB;   
      end;   
end;
{#############}

end.