delhpi MD5生成

效果如下图：

    调用单元文件：

   Unit1.pas

 unit Unit1;

 interface

 uses
   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
   Dialogs, StdCtrls;

 type
   TForm1 = class(TForm)
     Button1: TButton;
     Button2: TButton;
     Edit1: TEdit;
     Edit2: TEdit;
     procedure Button1Click(Sender: TObject);
   private
     { Private declarations }
   public
     { Public declarations }
   end;

 var
   Form1: TForm1;

 implementation
 uses
   AMD5;
 {$R *.dfm}

 procedure TForm1.Button1Click(Sender: TObject);
 var
   md5str:string;
 begin
   md5str:=sMD5.MD5(Edit1.Text,False);
   Edit2.Text:=md5str;
 end;

 end.

    被调用的单元文件：

    AMD5.pas

 unit AMD5;

 interface

         ////////////////////////////////////////////
         //  文件名 : AMD5.pas                     //
         //   功能  : 与md5.asp计算结果相同        //
         //   作者  : 由ScriptBaby改编自md5.asp    //
         // 完成时间: 2004-07-21                   //
         ////////////////////////////////////////////

               //请转载者保留以上信息，谢谢//

 uses
   SysUtils;

 type
   arrlongword = array of longword;

 type
   sMD5 = class
     class function RotateLeft(const lValue, Bits: longword): longword;
     class function MD5(const sMessage: string; const sType: boolean = false): string;
     class function ConvToWord(const sMessage: string): arrlongword; overload;
     class function ConvToWord(const sMessage: WideString): arrlongword; overload;
     class function WordToHex(const lValue: longword): string;
   end;

 implementation

  const
   BITS_TO_A_BYTE = 8;
   BYTES_TO_A_WORD = 4;
   BITS_TO_A_WORD = 32;

   cAA = $67452301;
   cBB = $EFCDAB89;
   cCC = $98BADCFE;
   cDD = $10325476;

   MODULUS_BITS = 512;
   CONGRUENT_BITS = 448;

 { sMD5 }

 class function sMD5.ConvToWord(const sMessage: WideString): arrlongword;
 var
   lMessageLength,
   lNumberOfWords,
   lBytePosition,
   lByteCount,
   lWordCount: longword;
   lWordArray: arrlongword;

   { Function }
   function Asc(const t: WideChar): Smallint;
   var
     s: string;
     a: Smallint;
   begin
      s := t;

      a := Smallint(s[1]);
      case Length(s) of
        2:
        begin
          a := a shl 8;
          a := a + Smallint(s[2]);
        end
      else ;
      end;

      Result := a;
   end;




  begin
   lMessageLength := Length(sMessage);

   lNumberOfWords := (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) div BITS_TO_A_BYTE)) div (MODULUS_BITS div BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS div BITS_TO_A_WORD);

   SetLength(lWordArray, lNumberOfWords);

   lByteCount := 0;
   While lByteCount < lMessageLength do begin
     lWordCount := lByteCount div BYTES_TO_A_WORD;
     lBytePosition := (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE;
     lWordArray[lWordCount] := lWordArray[lWordCount] Or longword(Asc(sMessage[lByteCount + 1]) shl lBytePosition);
     lByteCount := lByteCount + 1;
   end;

   lWordCount := lByteCount div BYTES_TO_A_WORD;
   lBytePosition := (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE;

   lWordArray[lWordCount] := lWordArray[lWordCount] or ($80 shl lBytePosition);

   lWordArray[lNumberOfWords - 2] := lMessageLength shl 3;
   lWordArray[lNumberOfWords - 1] := lMessageLength shr 29;

   Result := lWordArray;

 end;

 class function sMD5.ConvToWord(const sMessage: string): arrlongword;
 begin
   Result := ConvToWord(WideString(sMessage));
 end;

 class function sMD5.MD5(const sMessage: string;const sType: boolean = false): string;
 const
   S11 = 7;
   S12 = 12;
   S13 = 17;
   S14 = 22;
   S21 = 5;
   S22 = 9;
   S23 = 14;
   S24 = 20;
   S31 = 4;
   S32 = 11;
   S33 = 16;
   S34 = 23;
   S41 = 6;
   S42 = 10;
   S43 = 15;
   S44 = 21;



 var
   k: integer;
   AA, BB, CC, DD, a, b, c, d: longword;
   x: arrlongword;
   s: string;

   { functions }

   function md5_F(const x, y, z: longword): longword;
   begin
     Result := (x And y) Or ((Not x) And z);
   end;

   function md5_G(const x, y, z: longword): longword;
   begin
     Result := (x And z) Or (y And (Not z));
   end;

   function md5_H(const x, y, z: longword): longword;
   begin
     Result := (x Xor y Xor z);
   end;

   function md5_I(const x, y, z: longword): longword;
   begin
     Result := (y Xor (x Or (Not z)));
   end;

   procedure md5_FF(var a: longword; const b, c, d, x, s, ac: longword);
   begin
     a := a + md5_F(b, c, d) + x + ac;
     a := RotateLeft(a, s);
     a := a + b;
   end;

   procedure md5_GG(var a: longword; const b, c, d, x, s, ac: longword);
   begin
     a := a + md5_G(b, c, d) + x + ac;
     a := RotateLeft(a, s);
     a := a + b;
   end;

   procedure md5_HH(var a: longword; const b, c, d, x, s, ac: longword);
   begin
     a := a + md5_H(b, c, d) + x + ac;
     a := RotateLeft(a, s);
     a := a + b;
   end;



   procedure md5_II(var a: longword; const b, c, d, x, s, ac: longword);
   begin
     a := a + md5_I(b, c, d) + x + ac;
     a := RotateLeft(a, s);
     a := a + b;
   end;

 begin

   { MD5 }
   x := ConvToWord(sMessage);


   a := cAA;
   b := cBB;
   c := cCC;
   d := cDD;

   k := 0;
   repeat
     AA := a;
     BB := b;
     CC := c;
     DD := d;

     md5_FF(a, b, c, d, x[k + 0], S11, $D76AA478);
     md5_FF(d, a, b, c, x[k + 1], S12, $E8C7B756);
     md5_FF(c, d, a, b, x[k + 2], S13, $242070DB);
     md5_FF(b, c, d, a, x[k + 3], S14, $C1BDCEEE);
     md5_FF(a, b, c, d, x[k + 4], S11, $F57C0FAF);
     md5_FF(d, a, b, c, x[k + 5], S12, $4787C62A);
     md5_FF(c, d, a, b, x[k + 6], S13, $A8304613);
     md5_FF(b, c, d, a, x[k + 7], S14, $FD469501);
     md5_FF(a, b, c, d, x[k + 8], S11, $698098D8);
     md5_FF(d, a, b, c, x[k + 9], S12, $8B44F7AF);
     md5_FF(c, d, a, b, x[k + 10], S13, $FFFF5BB1);
     md5_FF(b, c, d, a, x[k + 11], S14, $895CD7BE);
     md5_FF(a, b, c, d, x[k + 12], S11, $6B901122);
     md5_FF(d, a, b, c, x[k + 13], S12, $FD987193);
     md5_FF(c, d, a, b, x[k + 14], S13, $A679438E);
     md5_FF(b, c, d, a, x[k + 15], S14, $49B40821);

     md5_GG(a, b, c, d, x[k + 1], S21, $F61E2562);
     md5_GG(d, a, b, c, x[k + 6], S22, $C040B340);
     md5_GG(c, d, a, b, x[k + 11], S23, $265E5A51);
     md5_GG(b, c, d, a, x[k + 0], S24, $E9B6C7AA);
     md5_GG(a, b, c, d, x[k + 5], S21, $D62F105D);
     md5_GG(d, a, b, c, x[k + 10], S22, $2441453);
     md5_GG(c, d, a, b, x[k + 15], S23, $D8A1E681);
     md5_GG(b, c, d, a, x[k + 4], S24, $E7D3FBC8);
     md5_GG(a, b, c, d, x[k + 9], S21, $21E1CDE6);
     md5_GG(d, a, b, c, x[k + 14], S22, $C33707D6);
     md5_GG(c, d, a, b, x[k + 3], S23, $F4D50D87);
     md5_GG(b, c, d, a, x[k + 8], S24, $455A14ED);
     md5_GG(a, b, c, d, x[k + 13], S21, $A9E3E905);
     md5_GG(d, a, b, c, x[k + 2], S22, $FCEFA3F8);
     md5_GG(c, d, a, b, x[k + 7], S23, $676F02D9);
     md5_GG(b, c, d, a, x[k + 12], S24, $8D2A4C8A);




     md5_HH(a, b, c, d, x[k + 5], S31, $FFFA3942);
     md5_HH(d, a, b, c, x[k + 8], S32, $8771F681);
     md5_HH(c, d, a, b, x[k + 11], S33, $6D9D6122);
     md5_HH(b, c, d, a, x[k + 14], S34, $FDE5380C);
     md5_HH(a, b, c, d, x[k + 1], S31, $A4BEEA44);
     md5_HH(d, a, b, c, x[k + 4], S32, $4BDECFA9);
     md5_HH(c, d, a, b, x[k + 7], S33, $F6BB4B60);
     md5_HH(b, c, d, a, x[k + 10], S34, $BEBFBC70);
     md5_HH(a, b, c, d, x[k + 13], S31, $289B7EC6);
     md5_HH(d, a, b, c, x[k + 0], S32, $EAA127FA);
     md5_HH(c, d, a, b, x[k + 3], S33, $D4EF3085);
     md5_HH(b, c, d, a, x[k + 6], S34, $4881D05);
     md5_HH(a, b, c, d, x[k + 9], S31, $D9D4D039);
     md5_HH(d, a, b, c, x[k + 12], S32, $E6DB99E5);
     md5_HH(c, d, a, b, x[k + 15], S33, $1FA27CF8);
     md5_HH(b, c, d, a, x[k + 2], S34, $C4AC5665);

     md5_II(a, b, c, d, x[k + 0], S41, $F4292244);
     md5_II(d, a, b, c, x[k + 7], S42, $432AFF97);
     md5_II(c, d, a, b, x[k + 14], S43, $AB9423A7);
     md5_II(b, c, d, a, x[k + 5], S44, $FC93A039);
     md5_II(a, b, c, d, x[k + 12], S41, $655B59C3);
     md5_II(d, a, b, c, x[k + 3], S42, $8F0CCC92);
     md5_II(c, d, a, b, x[k + 10], S43, $FFEFF47D);
     md5_II(b, c, d, a, x[k + 1], S44, $85845DD1);
     md5_II(a, b, c, d, x[k + 8], S41, $6FA87E4F);
     md5_II(d, a, b, c, x[k + 15], S42, $FE2CE6E0);
     md5_II(c, d, a, b, x[k + 6], S43, $A3014314);
     md5_II(b, c, d, a, x[k + 13], S44, $4E0811A1);
     md5_II(a, b, c, d, x[k + 4], S41, $F7537E82);
     md5_II(d, a, b, c, x[k + 11], S42, $BD3AF235);
     md5_II(c, d, a, b, x[k + 2], S43, $2AD7D2BB);
     md5_II(b, c, d, a, x[k + 9], S44, $EB86D391);

     a := a + AA;
     b := b + BB;
     c := c + CC;
     d := d + DD;

   k := k + 16;
   until k > High(x);

   if sType then
   begin
     s := WordToHex(a) + WordToHex(b) + WordToHex(c) + WordToHex(d)
   end
   else
   begin
     s := WordToHex(b) + WordToHex(c);
   end;

   Result := StrLower(PAnsiChar(s));
 end;

 class function sMD5.RotateLeft(const lValue, Bits: longword): longword;
 begin
   Result := (lValue shl Bits) Or (lValue shr (32 - Bits));
 end;

 class function sMD5.WordToHex(const lValue: longword): string;
 var
   s: string;
 begin
   s := inttohex(lValue, 8);
   Result := s[7]+s[8]+s[5]+s[6]+s[3]+s[4]+s[1]+s[2];
 end;

 end.