delphi中使用MD5

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http://www.cnblogs.com/ljl_falcon/archive/2012/05/15/2501275.html

方法1:
在Delphi自带的Indy控件中其实是提供了MD2,MD4,MD5对象的,我们可以直接使用它们来完成
MD5的签名算法。而不需要再去找其它的DLL或是Pas了。
在Uses单元中引用 IdHash,IdHashMessageDigest 单元,再写如下代码即可以达到MD5的实现。
 
procedure TForm1.Button1Click(Sender: TObject);
var
MyMD5: TIdHashMessageDigest5;
Digest: T4x4LongWordRecord;
begin
MyMD5 := TIdHashMessageDigest5.Create;
Digest := MyMD5.HashValue('');
ShowMessage('32: ' + MyMD5.AsHex(Digest)); //显示32个字符长度的MD5签名结果
ShowMessage('16: ' + Copy(MyMD5.AsHex(Digest), 9, 16)); //显示16个字符长度的
MD5签名结果
end;
说明:
MyMD5.HashValue 函数中可以是一个字符串或是一个流对象,它返回的结果类型为 T4x4L
ongWordRecord 的MD5签名后结果
MyMD5.AsHex 函数是将T4x4LongWordRecord的Md5签名转换成为十六进制的MD5签名字符串。
 
法2:
来源:南山软件屋
unit 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;    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;    function RivestStr(Str: string): string; //MD5 string  function RivestFile(FileName: string): string; //MD5 file    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;    function RivestStr(Str: string): string;  begin  Result := MD5Print(MD5String(Str));  end;    function RivestFile(FileName: string): string;  begin  Result := MD5Print(MD5File(FileName));  end;    end.

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