如何实现用MD5加密方式?(100)

如何实现用MD5加密方式?

{******************************************************************************} { CnPack For Delphi/C++Builder } { 中国人自己的开放源码第三方开发包 } { (C)Copyright 2001-2005 CnPack 开发组 } { ------------------------------------ } { } { 本开发包是开源的自由软件，您可以遵照 CnPack 的发布协议来修 } { 改和重新发布这一程序。 } { } { 发布这一开发包的目的是希望它有用，但没有任何担保。甚至没有 } { 适合特定目的而隐含的担保。更详细的情况请参阅 CnPack 发布协议。 } { } { 您应该已经和开发包一起收到一份 CnPack 发布协议的副本。如果 } { 还没有，可访问我们的网站： } { } { 网站地址：http://www.cnpack.org } { 电子邮件：master@cnpack.org } { } {******************************************************************************} {******************************************************************************} { 该单元基于Ronald L. Rivest的MD5.pas改写，以下是MD5.pas的声明： } { -----------------------------------------------------------------------------} { } { MD5 Message-Digest for Delphi 4 } { } { Delphi 4 Unit implementing the } { RSA Data Security, Inc. MD5 Message-Digest Algorithm } { } { Implementation of Ronald L. Rivest's RFC 1321 } { } { Copyright ?1997-1999 Medienagentur Fichtner & Meyer } { Written by Matthias Fichtner } { } { -----------------------------------------------------------------------------} { See RFC 1321 for RSA Data Security's copyright and license notice! } { -----------------------------------------------------------------------------} { The latest release of md5.pas will always be available from } { the distribution site at: http://www.fichtner.net/delphi/md5/ } { -----------------------------------------------------------------------------} { Please send questions, bug reports and suggestions } { regarding this code to: mfichtner@fichtner-meyer.com } { -----------------------------------------------------------------------------} { This code is provided "as is" without express or } { implied warranty of any kind. Use it at your own risk. } {******************************************************************************} unit CnMD5; {* |================================================================================* 软件名称：开发包基础库* 单元名称：MD5算法单元* 单元作者：何清（QSoft） hq.com@263.net; http://qsoft.51.net* 备 注：* 开发平台：PWin2000Pro + Delphi 5.0* 兼容测试：PWin9X/2000/XP + Delphi 5/6* 本 地 化：该单元中的字符串均符合本地化处理方式* 单元标识：$Id: CnMD5.pas,v 1.3 2005/09/29 06:38:35 zjy Exp $* 修改记录：2003.09.18 V1.1* 好不容易找到了该单元原作者的版权声明* 2003.09.18 V1.0* 创建单元================================================================================//LowerCase(cnmd5.MD5Print(cnmd5.MD5String(edt1.Text)));|} interface {$I CnPack.inc} {$OVERFLOWCHECKS OFF} {$RANGECHECKS OFF} uses Windows; type TMD5Count = array[0..1] of DWORD; TMD5State = array[0..3] of DWORD; TMD5Block = array[0..15] of DWORD; TMD5CBits = array[0..7] of byte; TMD5Digest = array[0..15] of byte; TMD5Buffer = array[0..63] of byte; TMD5Context = record State : TMD5State; Count : TMD5Count; Buffer : TMD5Buffer; end; procedure MD5Init(var Context: TMD5Context); procedure MD5Update(var Context: TMD5Context; Input: pChar; Length: longword); procedure MD5Final(var Context: TMD5Context; var Digest: TMD5Digest); //---------------------------------------------------------------- // 用户API函数定义 //---------------------------------------------------------------- function MD5Buffer(const Buffer; Count: Longword): TMD5Digest; {* 对数据块进行MD5转换 | const Buffer - 要计算的数据块 Count: Longword - 数据块长度 |} function MD5String(const Str: string): TMD5Digest; {* 对String类型数据进行MD5转换 | Str: string - 要计算的字符串 |} function MD5File(const FileName: string): TMD5Digest; {* 对指定文件数据进行MD5转换 | FileName: string - 要计算的文件名 |} function MD5Print(const Digest: TMD5Digest): string; {* 以十六进制格式输出MD5计算值 | Digest: TMD5Digest - 指定的MD5计算值 |} function MD5Match(const D1, D2: TMD5Digest): boolean; {* 比较两个MD5计算值是否相等 | D1: TMD5Digest - 需要比较的MD5计算值 D2: TMD5Digest - 需要比较的MD5计算值 |} implementation var PADDING: TMD5Buffer = ( $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; asm // Result := (x and y) or ((not x) and z); AND EDX, EAX NOT EAX AND EAX, ECX OR EAX, EDX end; function G(x, y, z: DWORD): DWORD; asm //Result := (x and z) or (y and (not z)); AND EAX, ECX NOT ECX AND EDX, ECX OR EAX, EDX end; function H(x, y, z: DWORD): DWORD; asm //Result := x xor y xor z; XOR EAX, EDX XOR EAX, ECX end; function I(x, y, z: DWORD): DWORD; asm //Result := y xor (x or (not z)); NOT ECX OR EAX, ECX XOR EAX, EDX end; procedure rot(var x: DWORD; n: BYTE); asm //x := (x shl n) or (x shr (32 - n)); PUSH EBX MOV CL, $20 SUB CL, DL MOV EBX, [EAX] SHR EBX, CL MOV ECX, EDX MOV EDX, [EAX] SHL EDX, CL OR EBX, EDX MOV [EAX], EBX POP EBX 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: TMD5State); var a, b, c, d: DWORD; Block: TMD5Block; 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: TMD5Context); 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(TMD5Buffer)); end; end; // Update given Context to include Length bytes of Input procedure MD5Update(var Context: TMD5Context; 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, Context.State); inc(I, 64); end; Index := 0; end else I := 0; CopyMemory(@Context.Buffer[Index], @Input, Length - I); end; // Finalize given Context, create Digest and zeroize Context procedure MD5Final(var Context: TMD5Context; var Digest: TMD5Digest); var Bits: TMD5CBits; 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(TMD5Context)); end; //---------------------------------------------------------------- // 用户API函数实现 //---------------------------------------------------------------- // 对数据块进行MD5转换 function MD5Buffer(const Buffer; Count: Longword): TMD5Digest; var Context: TMD5Context; begin MD5Init(Context); MD5Update(Context, PChar(Buffer), Count); MD5Final(Context, Result); end; // 对String类型数据进行MD5转换 function MD5String(const Str: string): TMD5Digest; var Context: TMD5Context; begin MD5Init(Context); MD5Update(Context, pChar(Str), length(Str)); MD5Final(Context, Result); end; // 对指定文件数据进行MD5转换 function MD5File(const FileName: string): TMD5Digest; var FileHandle: THandle; MapHandle: THandle; ViewPointer: pointer; Context: TMD5Context; begin MD5Init(Context); FileHandle := CreateFile(pChar(FileName), 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; // 以十六进制格式输出MD5计算值 function MD5Print(const Digest: TMD5Digest): 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[(Digest shr 4) and $0f] + Digits[Digest and $0f]; end; // 比较两个MD5计算值是否相等 function MD5Match(const D1, D2: TMD5Digest): boolean; var I: byte; begin I := 0; Result := TRUE; while Result and (I < 16) do begin Result := D1 = D2; inc(I); end; end; end.

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'))如果要用这个单元，只需要在项目中添加这个文件，uses md5，就可以了delphi 6以上版本都可以。//---------------------------------------------------------------------/************************************ * md5单元加密 * * created by luoyanqing 20090312 * ************************************/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;// -----------------------------------------------------------------------------------------------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 Targetprocedure 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 Targetprocedure 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 Bufferprocedure 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 Contextprocedure 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 Inputprocedure 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, Context.State); inc(I, 64); end; Index := 0; end else I := 0; CopyMemory(@Context.Buffer[Index], @Input, Length - I);end;// Finalize given Context, create Digest and zeroize Contextprocedure 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 Messagefunction 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 Namefunction 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 Digestfunction 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 shr 4) and $0f] + Digits[D and $0f];end;// -----------------------------------------------------------------------------------------------// Compare two Digestsfunction MD5Match(D1, D2: MD5Digest): boolean;var I: byte;begin I := 0; Result := TRUE; while Result and (I < 16) do begin Result := D1 = D2; inc(I); end;end;end.

需要DEMO的话，我发给你。

谢谢你 luoyanqing119 test2009ok@126.com

多人接受答案了。