function Encode(Str: string): string;
var //加密
TmpChr: AnsiChar;
i, Len: integer;
begin
Result := Str;
Len := Length(Result);
TmpChr := Result[1];
for i := 1 to Len - 1 do
Result[i] := Result[i + 1];
Result[Len] := TmpChr;
end;
function Decode(Str: string): string;
var //解密
TmpChr: AnsiChar;
i, Len: integer;
begin
Result := Str;
Len := Length(Result);
TmpChr := Result[Len];
for i := Len downto 2 do
Result[i] := Result[i - 1];
Result[1] := TmpChr;
end;
{异或 加密解密}
const // 首先定义一个常量数组
XorKey: array[0..7] of Byte = ($B2, $91, $AA, $55, $93, $6D, $84, $47); //字符串加密用
//数组的值可以自己改
function Enc(Str: string): string; //字符加密函数 这是用的一个异或加密
var
i, j: Integer;
begin
Result := '';
j := 0;
for i := 1 to Length(Str) do
begin
Result := Result + IntToHex(Byte(Str[i]) xor XorKey[j], 2);
j := (j + 1) mod 8;
end;
end;
function Dec(Str: string): string; //字符解密函数
var
i, j: Integer;
begin
Result := '';
j := 0;
for i := 1 to Length(Str) div 2 do
begin
Result := Result + Char(StrToInt('$' + Copy(Str, i * 2 - 1, 2)) xor XorKey[j]);
j := (j + 1) mod 8;
end;
end;
function Crypt(s: string; Key: Word;
const bEncrypt: boolean): string;
const
SeedA = 787; /// 常量，你可以修改
SeedB = 787; /// 常量，你可以修改
var
i: integer;
ps, pr: ^byte;
begin
if bEncrypt then
s := s + #0;
SetLength(Result, Length(s));
ps := @s[1];
pr := @Result[1];
for i := 1 to length(s) do
begin
pr^ := ps^ xor (Key shr 8);
if bEncrypt then
Key := (pr^ + Key) * SeedA + SeedB
else
Key := (ps^ + Key) * SeedA + SeedB;
pr := pointer(integer(pr) + 1);
ps := pointer(integer(ps) + 1);
end;
end;
///////////////////
function EncrypStr(Src, Key: string): string; //字符串加密函数
//对字符串加密(Src:源 Key:密匙)
var KeyLen: Integer;
KeyPos: Integer;
offset: Integer;
dest: string;
SrcPos: Integer;
SrcAsc: Integer;
Range: Integer;
begin
KeyLen := Length(Key);
if KeyLen = 0 then key := 'delphi';
KeyPos := 0;
Range := 256;
Randomize;
offset := Random(Range);
dest := format('%1.2x', [offset]);
for SrcPos := 1 to Length(Src) do
begin
SrcAsc := (Ord(Src[SrcPos]) + offset) mod 255;
if KeyPos < KeyLen
then KeyPos := KeyPos + 1
else KeyPos := 1;
SrcAsc := SrcAsc xor Ord(Key[KeyPos]);
dest := dest + format('%1.2x', [SrcAsc]);
offset := SrcAsc;
end;
Result := Dest;
end;
function UncrypStr(Src, Key: string): string; //字符串解密函数
//对字符串解密(Src:源 Key:密匙)
var KeyLen: Integer;
KeyPos: Integer;
offset: Integer;
dest: string;
SrcPos: Integer;
SrcAsc: Integer;
TmpSrcAsc: Integer;
begin
KeyLen := Length(Key);
if KeyLen = 0 then key := 'delphi';
KeyPos := 0;
offset := StrToInt('$' + copy(src, 1, 2));
SrcPos := 3;
repeat
SrcAsc := StrToInt('$' + copy(src, SrcPos, 2));
if KeyPos < KeyLen
then KeyPos := KeyPos + 1
else KeyPos := 1;
TmpSrcAsc := SrcAsc xor Ord(Key[KeyPos]);
if TmpSrcAsc <= offset
then TmpSrcAsc := 255 + TmpSrcAsc - offset
else TmpSrcAsc := TmpSrcAsc - offset;
dest := dest + chr(TmpSrcAsc);
offset := srcAsc;
SrcPos := SrcPos + 2;
until SrcPos >= Length(Src);
Result := Dest;
end;
//********************************************************
// 加密解密 (利用异或运算) （方式2）
//********************************************************
function encryptstr(const s: string; skey: string): string; //加密
var
i, j: integer;
hexS, hexskey, midS, tmpstr: string;
a, b, c: byte;
begin
hexS := myStrtoHex(s);
hexskey := myStrtoHex(skey);
midS := hexS;
for i := 1 to (length(hexskey) div 2) do
begin
if i <> 1 then midS := tmpstr;
tmpstr := '';
for j := 1 to (length(midS) div 2) do
begin
a := strtoint('$' + midS[2 * j - 1] + midS[2 * j]);
b := strtoint('$' + hexskey[2 * i - 1] + hexskey[2 * i]);
c := a xor b;
tmpstr := tmpstr + myStrtoHex(chr(c));
end;
end;
result := tmpstr;
end;
function decryptstr(const s: string; skey: string): string; //解密
var
i, j: integer;
hexS, hexskey, midS, tmpstr: string;
a, b, c: byte;
begin
hexS := s; //应该是该字符串
if length(hexS) mod 2 = 1 then
begin
showmessage('密文错误！');
exit;
end;
hexskey := myStrtoHex(skey);
tmpstr := hexS;
midS := hexS;
for i := (length(hexskey) div 2) downto 1 do
begin
if i <> (length(hexskey) div 2) then midS := tmpstr;
tmpstr := '';
for j := 1 to (length(midS) div 2) do
begin
a := strtoint('$' + midS[2 * j - 1] + midS[2 * j]);
b := strtoint('$' + hexskey[2 * i - 1] + hexskey[2 * i]);
c := a xor b;
tmpstr := tmpstr + myStrtoHex(chr(c));
end;
end;
result := myHextoStr(tmpstr);
end;
没有一个个去研究，调试。以后在时间在慢慢试。
(完)