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unit MD5;
interface
uses Windows, Messages, SysUtils, Variants, Classes;
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: PAnsiChar; Length: longword);procedure MD5Final(var Context: MD5Context; var Digest: MD5Digest);function MD5File(N: String): MD5Digest;function MD5Print(D: MD5Digest): AnsiString;function MD5F(FileName: AnsiString): AnsiString;function MD5S(Str: AnsiString): AnsiString;
// MD5F为计算文件的MD5值,MD5S为计算字符串的MD5值!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);
implementation
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;
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;
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;
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;
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;
procedure MD5Update(var Context: MD5Context; Input: PAnsiChar; 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;
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;
function MD5String(M: AnsiString): MD5Digest;var Context: MD5Context;begin MD5Init(Context); MD5Update(Context, PAnsiChar(M), Length(M)); MD5Final(Context, Result);end;
function MD5File(N: String): MD5Digest;var FileHandle: THandle; MapHandle: THandle; ViewPointer: pointer; Context: MD5Context;begin MD5Init(Context); FileHandle := CreateFile(PWideChar(WideString(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;
function MD5Print(D: MD5Digest): AnsiString;var I: Byte;const Digits: array [0 .. 15] of Ansichar = ('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;
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 MD5S(Str: AnsiString): AnsiString;begin Result := MD5Print(MD5String(Str));end;
function MD5F(FileName: AnsiString): AnsiString;begin Result := MD5Print(MD5File(string(FileName)));end;
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