delphi加密文件夹
我用的加密解密
function EncryptString(Source, Key: string): string;
//对字符串加密(Source: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(Source) do
begin
SrcAsc := (Ord(Source[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 UnEncryptString(Source, Key: string): string;
//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('$' + (Source, 1, 2));
SrcPos := 3;
repeat
SrcAsc := strtoint('$' + (Source, 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(Source);
result := Dest;
end;
‘贰’ DELPHI 中INI文件加密还原的问题
可以用异或加密算法。用明文的ASCII码值同密钥进行异或运算，得到密文，解密时用密文同密钥在进行异或运算即可得到明文
‘叁’ Delphi常用的字符串（密码）加密方式都有哪几种哪种方法可以将数字字母混合加密成纯数字
多了，des、aes、base64、rsa、md5、sha等等，等等，数不胜数。每一种算法，都可以将数字字母加密成纯数字。因为加密的结果可以再加密。比如aes加密后的密文，是16进制的东西，我们可以把这个结果转换成10进制，不就成了纯数字了吗？所以，所有算法，都可以实现你所说的。
‘肆’ 谁能给个DELPHI写的可逆加密函数
function tForm1.Decrypt(const s:string):string; //key=1时为加密，0为解密
var
I:Integer;
begin
Result:='';
for i:=1 to length(s) do
result := result+chr(ord(s[i]) xor i xor 69);
result := result + char(69);
end;
function tForm1.Decrypt1(const s:string):string; //key=1时为加密，0为解密
var
I:Integer;
begin
Result:='';
for i:=1 to length(s) - 1 do
result := result+chr(ord(s[i]) xor i xor 69);
end;
‘伍’ 在delphi中怎样实现SHA1加密
方法一、使用 delphi 内置函数。
delphi 的 IdHashSHA 单元，提供了 TidHashSHa1 类，可以实现 SHA1 加密。
方法二、使用第三方控件。
如：CnPack 小组提供的 CnSHA1。示例代码如下：
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procere TForm1.btnSha1Click(Sender: TObject);
begin
{$IFDEF UNICODE}
pnlSha1.Caption := SHA1Print(SHA1StringA(AnsiString(edtSha1.Text)));
{$ELSE}
pnlSha1.Caption := SHA1Print(SHA1String(edtSha1.Text));
{$ENDIF}
end;
‘陆’ 电脑文档加密数据加密用什么软件好
推荐使用域之盾系统 可以针对各类日常办公软件一键加密 加密后的文件任何形式的非法外发打开都是乱码 希望可以帮助到你
1. 透明加解密
系统根据管理策略对相应文件进行加密，用户访问需要连接到服务器，按权限访问，越权访问会受限，通过共享、离线和外发管理可以实现更多的访问控制。
2. 泄密控制
对打开加密文档的应用程序进行打印、内存窃取、拖拽和剪贴板等操作管控，用户不能主动或被动地泄漏机密数据。
3. 审批管理
支持共享、离线和外发文档，管理员可以按照实际工作需求，配置是否对这些操作进行强制审批。用户在执行加密文档的共享、离线和外发等操作时，将视管理员的权限许可，可能需要经过审批管理员审批。
4. 离线文档管理
对于员工外出无法接入网络的情况可采用系统的离线管理功能。通过此功能授权指定用户可以在一定时间内不接入网络仍可轻松访问加密数据，而该用户相应的安全策略仍然生效，相应数据仍然受控，文档权限也与联网使用一样。
5. 外发文档管理
本功能主要是解决数据二次泄密的威胁，目的是让发出的文档仍然受控。通过此功能对 需要发出的文件进行审批和授权后，使用者不必安装加密客户端即可轻松访问受控文件，且可对文件的操作权限及生命周期予以管控。
6. 审计管理
对加密文档的常规操作，进行详细且有效的审计。对离线用户，联网后会自动上传相关日志到服务器。
7. 自我保护
通过在操作系统的驱动层对系统自身进行自我保护，保障客户端不被非法破坏，并且始终运行在安全可信状态。即使客户端被意外破坏，客户端计算机里的加密文档也不会丢失或泄漏。
‘柒’ delphi用 MD5加密后生成文件
/* 收藏的一个MD5加密解密
1、 MD5String、MD5File、MD5Print、MD5Match这四个函数是供调用的。其他是用来辅助这几个函///////数//的子函数。
2、MD5String为加密字符串。
3、MD5File为加密这个文件。
4、MD5Print是将加密后的密文转换成字符串。
5、MD5Match是用来比较密文是否一致。
加密字符串aaa MD5String('aaa')
将加密后的aaa显示出来 MD5Print(MD5String('aaa'))
比较两次密文是否一致： MD5Match(MD5String('第一次明文'),MD5String('第二次输入的明文'))
*/
unit U_MD5;
// -----------------------------------------------------------------------------------------------
INTERFACE
// -----------------------------------------------------------------------------------------------
uses
Windows;
type
MD5Count = array[0..1] of DWORD;
MD5State = array[0..3] of DWORD;
MD5Block = array[0..15] of DWORD;
MD5CBits = array[0..7] of byte;
MD5Digest = array[0..15] of byte;
MD5Buffer = array[0..63] of byte;
MD5Context = record
State: MD5State;
Count: MD5Count;
Buffer: MD5Buffer;
end;
procere MD5Init(var Context: MD5Context);
procere MD5Update(var Context: MD5Context; Input: pChar; Length: longword);
procere MD5Final(var Context: MD5Context; var Digest: MD5Digest);
function MD5String(M: string): MD5Digest;
function MD5File(N: string): MD5Digest;
function MD5Print(D: MD5Digest): string;
function MD5Match(D1, D2: MD5Digest): boolean;
// -----------------------------------------------------------------------------------------------
IMPLEMENTATION
// -----------------------------------------------------------------------------------------------
var
PADDING: MD5Buffer = (
$80, $00, $00, $00, $00, $00, $00, $00,
$00, $00, $00, $00, $00, $00, $00, $00,
$00, $00, $00, $00, $00, $00, $00, $00,
$00, $00, $00, $00, $00, $00, $00, $00,
$00, $00, $00, $00, $00, $00, $00, $00,
$00, $00, $00, $00, $00, $00, $00, $00,
$00, $00, $00, $00, $00, $00, $00, $00,
$00, $00, $00, $00, $00, $00, $00, $00
);
function F(x, y, z: DWORD): DWORD;
begin
Result := (x and y) or ((not x) and z);
end;
function G(x, y, z: DWORD): DWORD;
begin
Result := (x and z) or (y and (not z));
end;
function H(x, y, z: DWORD): DWORD;
begin
Result := x xor y xor z;
end;
function I(x, y, z: DWORD): DWORD;
begin
Result := y xor (x or (not z));
end;
procere rot(var x: DWORD; n: BYTE);
begin
x := (x shl n) or (x shr (32 - n));
end;
procere FF(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
begin
inc(a, F(b, c, d) + x + ac);
rot(a, s);
inc(a, b);
end;
procere GG(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
begin
inc(a, G(b, c, d) + x + ac);
rot(a, s);
inc(a, b);
end;
procere HH(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
begin
inc(a, H(b, c, d) + x + ac);
rot(a, s);
inc(a, b);
end;
procere II(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);
begin
inc(a, I(b, c, d) + x + ac);
rot(a, s);
inc(a, b);
end;
// -----------------------------------------------------------------------------------------------
// Encode Count bytes at Source into (Count / 4) DWORDs at Target
procere Encode(Source, Target: pointer; Count: longword);
var
S: PByte;
T: PDWORD;
I: longword;
begin
S := Source;
T := Target;
for I := 1 to Count div 4 do begin
T^ := S^;
inc(S);
T^ := T^ or (S^ shl 8);
inc(S);
T^ := T^ or (S^ shl 16);
inc(S);
T^ := T^ or (S^ shl 24);
inc(S);
inc(T);
end;
end;
// Decode Count DWORDs at Source into (Count * 4) Bytes at Target
procere Decode(Source, Target: pointer; Count: longword);
var
S: PDWORD;
T: PByte;
I: longword;
begin
S := Source;
T := Target;
for I := 1 to Count do begin
T^ := S^ and $ff;
inc(T);
T^ := (S^ shr 8) and $ff;
inc(T);
T^ := (S^ shr 16) and $ff;
inc(T);
T^ := (S^ shr 24) and $ff;
inc(T);
inc(S);
end;
end;
// Transform State according to first 64 bytes at Buffer
procere Transform(Buffer: pointer; var State: MD5State);
var
a, b, c, d: DWORD;
Block: MD5Block;
begin
Encode(Buffer, @Block, 64);
a := State[0];
b := State[1];
c := State[2];
d := State[3];
FF (a, b, c, d, Block[ 0], 7, $d76aa478);
FF (d, a, b, c, Block[ 1], 12, $e8c7b756);
FF (c, d, a, b, Block[ 2], 17, $242070db);
FF (b, c, d, a, Block[ 3], 22, $c1bdceee);
FF (a, b, c, d, Block[ 4], 7, $f57c0faf);
FF (d, a, b, c, Block[ 5], 12, $4787c62a);
FF (c, d, a, b, Block[ 6], 17, $a8304613);
FF (b, c, d, a, Block[ 7], 22, $fd469501);
FF (a, b, c, d, Block[ 8], 7, $698098d8);
FF (d, a, b, c, Block[ 9], 12, $8b44f7af);
FF (c, d, a, b, Block[10], 17, $ffff5bb1);
FF (b, c, d, a, Block[11], 22, $895cd7be);
FF (a, b, c, d, Block[12], 7, $6b901122);
FF (d, a, b, c, Block[13], 12, $fd987193);
FF (c, d, a, b, Block[14], 17, $a679438e);
FF (b, c, d, a, Block[15], 22, $49b40821);
GG (a, b, c, d, Block[ 1], 5, $f61e2562);
GG (d, a, b, c, Block[ 6], 9, $c040b340);
GG (c, d, a, b, Block[11], 14, $265e5a51);
GG (b, c, d, a, Block[ 0], 20, $e9b6c7aa);
GG (a, b, c, d, Block[ 5], 5, $d62f105d);
GG (d, a, b, c, Block[10], 9, $2441453);
GG (c, d, a, b, Block[15], 14, $d8a1e681);
GG (b, c, d, a, Block[ 4], 20, $e7d3fbc8);
GG (a, b, c, d, Block[ 9], 5, $21e1cde6);
GG (d, a, b, c, Block[14], 9, $c33707d6);
GG (c, d, a, b, Block[ 3], 14, $f4d50d87);
GG (b, c, d, a, Block[ 8], 20, $455a14ed);
GG (a, b, c, d, Block[13], 5, $a9e3e905);
GG (d, a, b, c, Block[ 2], 9, $fcefa3f8);
GG (c, d, a, b, Block[ 7], 14, $676f02d9);
GG (b, c, d, a, Block[12], 20, $8d2a4c8a);
HH (a, b, c, d, Block[ 5], 4, $fffa3942);
HH (d, a, b, c, Block[ 8], 11, $8771f681);
HH (c, d, a, b, Block[11], 16, $6d9d6122);
HH (b, c, d, a, Block[14], 23, $fde5380c);
HH (a, b, c, d, Block[ 1], 4, $a4beea44);
HH (d, a, b, c, Block[ 4], 11, $4bdecfa9);
HH (c, d, a, b, Block[ 7], 16, $f6bb4b60);
HH (b, c, d, a, Block[10], 23, $bebfbc70);
HH (a, b, c, d, Block[13], 4, $289b7ec6);
HH (d, a, b, c, Block[ 0], 11, $eaa127fa);
HH (c, d, a, b, Block[ 3], 16, $d4ef3085);
HH (b, c, d, a, Block[ 6], 23, $4881d05);
HH (a, b, c, d, Block[ 9], 4, $d9d4d039);
HH (d, a, b, c, Block[12], 11, $e6db99e5);
HH (c, d, a, b, Block[15], 16, $1fa27cf8);
HH (b, c, d, a, Block[ 2], 23, $c4ac5665);
II (a, b, c, d, Block[ 0], 6, $f4292244);
II (d, a, b, c, Block[ 7], 10, $432aff97);
II (c, d, a, b, Block[14], 15, $ab9423a7);
II (b, c, d, a, Block[ 5], 21, $fc93a039);
II (a, b, c, d, Block[12], 6, $655b59c3);
II (d, a, b, c, Block[ 3], 10, $8f0ccc92);
II (c, d, a, b, Block[10], 15, $ffeff47d);
II (b, c, d, a, Block[ 1], 21, $85845dd1);
II (a, b, c, d, Block[ 8], 6, $6fa87e4f);
II (d, a, b, c, Block[15], 10, $fe2ce6e0);
II (c, d, a, b, Block[ 6], 15, $a3014314);
II (b, c, d, a, Block[13], 21, $4e0811a1);
II (a, b, c, d, Block[ 4], 6, $f7537e82);
II (d, a, b, c, Block[11], 10, $bd3af235);
II (c, d, a, b, Block[ 2], 15, $2ad7d2bb);
II (b, c, d, a, Block[ 9], 21, $eb86d391);
inc(State[0], a);
inc(State[1], b);
inc(State[2], c);
inc(State[3], d);
end;
// -----------------------------------------------------------------------------------------------
// Initialize given Context
procere MD5Init(var Context: MD5Context);
begin
with Context do begin
State[0] := $67452301;
State[1] := $efcdab89;
State[2] := $98badcfe;
State[3] := $10325476;
Count[0] := 0;
Count[1] := 0;
ZeroMemory(@Buffer, SizeOf(MD5Buffer));
end;
end;
// Update given Context to include Length bytes of Input
procere MD5Update(var Context: MD5Context; Input: pChar; Length: longword);
var
Index: longword;
PartLen: longword;
I: longword;
begin
with Context do begin
Index := (Count[0] shr 3) and $3f;
inc(Count[0], Length shl 3);
if Count[0] < (Length shl 3) then inc(Count[1]);
inc(Count[1], Length shr 29);
end;
PartLen := 64 - Index;
if Length >= PartLen then begin
CopyMemory(@Context.Buffer[Index], Input, PartLen);
Transform(@Context.Buffer, Context.State);
I := PartLen;
while I + 63 < Length do begin
Transform(@Input[I], Context.State);
inc(I, 64);
end;
Index := 0;
end else I := 0;
CopyMemory(@Context.Buffer[Index], @Input[I], Length - I);
end;
// Finalize given Context, create Digest and zeroize Context
procere MD5Final(var Context: MD5Context; var Digest: MD5Digest);
var
Bits: MD5CBits;
Index: longword;
PadLen: longword;
begin
Decode(@Context.Count, @Bits, 2);
Index := (Context.Count[0] shr 3) and $3f;
if Index < 56 then PadLen := 56 - Index else PadLen := 120 - Index;
MD5Update(Context, @PADDING, PadLen);
MD5Update(Context, @Bits, 8);
Decode(@Context.State, @Digest, 4);
ZeroMemory(@Context, SizeOf(MD5Context));
end;
// -----------------------------------------------------------------------------------------------
// Create digest of given Message
function MD5String(M: string): MD5Digest;
var
Context: MD5Context;
begin
MD5Init(Context);
MD5Update(Context, pChar(M), length(M));
MD5Final(Context, Result);
end;
// Create digest of file with given Name
function MD5File(N: string): MD5Digest;
var
FileHandle: THandle;
MapHandle: THandle;
ViewPointer: pointer;
Context: MD5Context;
begin
MD5Init(Context);
FileHandle := CreateFile(pChar(N), GENERIC_READ, FILE_SHARE_READ or FILE_SHARE_WRITE,
nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL or FILE_FLAG_SEQUENTIAL_SCAN, 0);
if FileHandle <> INVALID_HANDLE_VALUE then try
MapHandle := CreateFileMapping(FileHandle, nil, PAGE_READONLY, 0, 0, nil);
if MapHandle <> 0 then try
ViewPointer := MapViewOfFile(MapHandle, FILE_MAP_READ, 0, 0, 0);
if ViewPointer <> nil then try
MD5Update(Context, ViewPointer, GetFileSize(FileHandle, nil));
finally
UnmapViewOfFile(ViewPointer);
end;
finally
CloseHandle(MapHandle);
end;
finally
CloseHandle(FileHandle);
end;
MD5Final(Context, Result);
end;
// Create hex representation of given Digest
function MD5Print(D: MD5Digest): string;
var
I: byte;
const
Digits: array[0..15] of char =
('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f');
begin
Result := '';
for I := 0 to 15 do Result := Result + Digits[(D[I] shr 4) and $0f] + Digits[D[I] and $0f];
end;
// -----------------------------------------------------------------------------------------------
// Compare two Digests
function MD5Match(D1, D2: MD5Digest): boolean;
var
I: byte;
begin
I := 0;
Result := TRUE;
while Result and (I < 16) do begin
Result := D1[I] = D2[I];
inc(I);
end;
end;
end.
‘捌’ delphi实现DES字节流加密，该怎么解决
在 CnPack 提供的源代码包里，提供了 des 加解密单元文件，提供了以下四个功能函数：
function DESEncryptStr(Str, Key: AnsiString): AnsiString;
{* 传入明文与加密 Key，DES 加密返回密文，
注：由于密文可能含有扩展 ASCII 字符，因此在 DELPHI 2009 或以上版本中，请用
AnsiString 类型的变量接收返回值，以避免出现多余的 Unicode 转换而导致解密出错}
function DESDecryptStr(Str, Key: AnsiString): AnsiString;
{* 传入密文与加密 Key，DES 解密返回明文}
function DESEncryptStrToHex(Str, Key: AnsiString): AnsiString;
{* 传入明文与加密 Key，DES 加密返回转换成十六进制的密文}
function DESDecryptStrFromHex(StrHex, Key: AnsiString): AnsiString;
{* 传入十六进制的密文与加密 Key，DES 解密返回明文}