delphi 简单的英文数字字符串加密解密函数(不支持中文)


function EncryptSettings(Str : String): String;
var
X, Y : Integer;
A : Byte;
Key:string;
begin
Key:='Fi7ke'; //这个是加密钥匙,你可以随便设置,但解密钥匙要一样,不然解不了密
Y := 1;
for X := 1 to Length(Str) do
begin
A := (ord(Str[X]) and $0f) xor (ord(Key[Y]) and $0f);
Str[X] := char((ord(Str[X]) and $f0) + A);
Inc(Y);
If Y > length(Key) then Y := 1;
end;
Result := Str;
end;


function DecryptSettings(Str : String): String;
var
X, Y : Integer;
A : Byte;
Key:string;
begin
Key:='Fi7ke'; //注意了,这里要和加密钥匙一样.
Y := 1;
for X := 1 to Length(Str) do
begin
A := (ord(Str[X]) and $0f) xor (ord(Key[Y]) and $0f);
Str[X] := char((ord(Str[X]) and $f0) + A);
Inc(Y);
If Y > length(Key) then Y := 1;
end;
Result := Str;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
memo2.Text:=EncryptSettings(memo1.Text);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
memo1.Text:=DecryptSettings(memo2.Text);
end;

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