简单的MD5加密程序算法演示 算法, 演示, 程序

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简单的MD5加密程序算法演示
简单的MD5加密程序算法演示

本文介绍基本的MD5的加密算法的实现

还是Delphi 的程序

好先看MD5算法在Delphi中实现的基本函数

下面的代码可以直接复制保存成.pas的文件就可以用Delphi 直接使用的

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;

procedure MD5Init(var Context: MD5Context);
procedure MD5Update(var Context: MD5Context; Input: pChar; Length: longword);
procedure 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;

procedure rot(var x: DWORD; n: BYTE);
begin
   x := (x shl n) or (x shr (32 - n));
end;

procedure 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;

procedure 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;

procedure 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;

procedure 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
procedure 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
procedure 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
procedure 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
procedure 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
procedure 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
procedure 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.

上面是基本的算法和调用函数

下面来看怎么使用这些函数

wufeideai

delphi的语法。哎看了很久没明白

colin

看不懂

jkl2006

汗，有没有C的？
虽然说程序就代表思想，
但是对于菜鸟来说，还是用汉语写写它的思想吧。林子的江南小居


新BLOG，欢迎大家去踩点……
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userchm

回复 2# 的帖子

101010

Delphi 是什么啊`  c#怎么做啊`！

zjh7272

一步一步的写出来

很简单了


启动Delphi后\


现在窗体上方两个Edit控件

Edit1和Edit2

还有一个Butoont控件

两个Edit控件不需任何设置

然后双击Butoont控件

来到编写Butont控件的OnCilk事件的代码控件
我们写下如下代码

Edit2.Text:=amd5.sMD5.MD5(Edit1.Text);

这样就好了

F9运行看看效果把


运行效果:
运行效果