// tabs = 2<br>// -----------------------------------------------------------------------------------------------<br>//<br>// MD5 Message-Digest for Delphi 4<br>//<br>// Delphi 4 Unit implementing the<br>// RSA Data Security, Inc. MD5 Message-Digest Algorithm<br>//<br>// Implementation of Ronald L. Rivest's RFC 1321<br>//<br>// Copyright ?1997-1999 Medienagentur Fichtner & Meyer<br>// Written by Matthias Fichtner<br>//<br>// -----------------------------------------------------------------------------------------------<br>// See RFC 1321 for RSA Data Security's copyright and license notice!<br>// -----------------------------------------------------------------------------------------------<br>//<br>// 14-Jun-97 mf Implemented MD5 according to RFC 1321 RFC 1321<br>// 16-Jun-97 mf Initial release of the compiled unit (no source code) RFC 1321<br>// 28-Feb-99 mf Added MD5Match function for comparing two digests RFC 1321<br>// 13-Sep-99 mf Reworked the entire unit RFC 1321<br>// 17-Sep-99 mf Reworked the "Test Driver" project RFC 1321<br>// 19-Sep-99 mf Release of sources for MD5 unit and "Test Driver" project RFC 1321<br>//<br>// -----------------------------------------------------------------------------------------------<br>// The latest release of md5.pas will always be available from<br>// the distribution site at: http://www.fichtner.net/delphi/md5/<br>// -----------------------------------------------------------------------------------------------<br>// Please send questions, bug reports and suggestions<br>// regarding this code to: mfichtner@fichtner-meyer.com<br>// -----------------------------------------------------------------------------------------------<br>// This code is provided "as is" without express or<br>// implied warranty of any kind. Use it at your own risk.<br>// -----------------------------------------------------------------------------------------------<br><br>unit md5;<br><br>// -----------------------------------------------------------------------------------------------<br>INTERFACE<br>// -----------------------------------------------------------------------------------------------<br><br>uses<br> Windows;<br><br>type<br> MD5Count = array[0..1] of DWORD;<br> MD5State = array[0..3] of DWORD;<br> MD5Block = array[0..15] of DWORD;<br> MD5CBits = array[0..7] of byte;<br> MD5Digest = array[0..15] of byte;<br> MD5Buffer = array[0..63] of byte;<br> MD5Context = record<br> State: MD5State;<br> Count: MD5Count;<br> Buffer: MD5Buffer;<br> end;<br><br>procedure MD5Init(var Context: MD5Context);<br>procedure MD5Update(var Context: MD5Context; Input: pChar; Length: longword);<br>procedure MD5Final(var Context: MD5Context; var Digest: MD5Digest);<br><br>function MD5String(M: string): MD5Digest;<br>function MD5File(N: string): MD5Digest;<br>function MD5Print(D: MD5Digest): string;<br><br>function MD5Match(D1, D2: MD5Digest): boolean;<br><br>// -----------------------------------------------------------------------------------------------<br>IMPLEMENTATION<br>// -----------------------------------------------------------------------------------------------<br><br>var<br> PADDING: MD5Buffer = (<br> $80, $00, $00, $00, $00, $00, $00, $00,<br> $00, $00, $00, $00, $00, $00, $00, $00,<br> $00, $00, $00, $00, $00, $00, $00, $00,<br> $00, $00, $00, $00, $00, $00, $00, $00,<br> $00, $00, $00, $00, $00, $00, $00, $00,<br> $00, $00, $00, $00, $00, $00, $00, $00,<br> $00, $00, $00, $00, $00, $00, $00, $00,<br> $00, $00, $00, $00, $00, $00, $00, $00<br> );<br><br>function F(x, y, z: DWORD): DWORD;<br>begin<br> Result := (x and y) or ((not x) and z);<br>end;<br><br>function G(x, y, z: DWORD): DWORD;<br>begin<br> Result := (x and z) or (y and (not z));<br>end;<br><br>function H(x, y, z: DWORD): DWORD;<br>begin<br> Result := x xor y xor z;<br>end;<br><br>function I(x, y, z: DWORD): DWORD;<br>begin<br> Result := y xor (x or (not z));<br>end;<br><br>procedure rot(var x: DWORD; n: BYTE);<br>begin<br> x := (x shl n) or (x shr (32 - n));<br>end;<br><br>procedure FF(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);<br>begin<br> inc(a, F(b, c, d) + x + ac);<br> rot(a, s);<br> inc(a, b);<br>end;<br><br>procedure GG(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);<br>begin<br> inc(a, G(b, c, d) + x + ac);<br> rot(a, s);<br> inc(a, b);<br>end;<br><br>procedure HH(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);<br>begin<br> inc(a, H(b, c, d) + x + ac);<br> rot(a, s);<br> inc(a, b);<br>end;<br><br>procedure II(var a: DWORD; b, c, d, x: DWORD; s: BYTE; ac: DWORD);<br>begin<br> inc(a, I(b, c, d) + x + ac);<br> rot(a, s);<br> inc(a, b);<br>end;<br><br>// -----------------------------------------------------------------------------------------------<br><br>// Encode Count bytes at Source into (Count / 4) DWORDs at Target<br>procedure Encode(Source, Target: pointer; Count: longword);<br>var<br> S: PByte;<br> T: PDWORD;<br> I: longword;<br>begin<br> S := Source;<br> T := Target;<br> for I := 1 to Count div 4 do begin<br> T^ := S^;<br> inc(S);<br> T^ := T^ or (S^ shl 8);<br> inc(S);<br> T^ := T^ or (S^ shl 16);<br> inc(S);<br> T^ := T^ or (S^ shl 24);<br> inc(S);<br> inc(T);<br> end;<br>end;<br><br>// Decode Count DWORDs at Source into (Count * 4) Bytes at Target<br>procedure Decode(Source, Target: pointer; Count: longword);<br>var<br> S: PDWORD;<br> T: PByte;<br> I: longword;<br>begin<br> S := Source;<br> T := Target;<br> for I := 1 to Count do begin<br> T^ := S^ and $ff;<br> inc(T);<br> T^ := (S^ shr 8) and $ff;<br> inc(T);<br> T^ := (S^ shr 16) and $ff;<br> inc(T);<br> T^ := (S^ shr 24) and $ff;<br> inc(T);<br> inc(S);<br> end;<br>end;<br><br>// Transform State according to first 64 bytes at Buffer<br>procedure Transform(Buffer: pointer; var State: MD5State);<br>var<br> a, b, c, d: DWORD;<br> Block: MD5Block;<br>begin<br> Encode(Buffer, @Block, 64);<br> a := State[0];<br> b := State[1];<br> c := State[2];<br> d := State[3];<br> FF (a, b, c, d, Block[ 0], 7, $d76aa478);<br> FF (d, a, b, c, Block[ 1], 12, $e8c7b756);<br> FF (c, d, a, b, Block[ 2], 17, $242070db);<br> FF (b, c, d, a, Block[ 3], 22, $c1bdceee);<br> FF (a, b, c, d, Block[ 4], 7, $f57c0faf);<br> FF (d, a, b, c, Block[ 5], 12, $4787c62a);<br> FF (c, d, a, b, Block[ 6], 17, $a8304613);<br> FF (b, c, d, a, Block[ 7], 22, $fd469501);<br> FF (a, b, c, d, Block[ 8], 7, $698098d8);<br> FF (d, a, b, c, Block[ 9], 12, $8b44f7af);<br> FF (c, d, a, b, Block[10], 17, $ffff5bb1);<br> FF (b, c, d, a, Block[11], 22, $895cd7be);<br> FF (a, b, c, d, Block[12], 7, $6b901122);<br> FF (d, a, b, c, Block[13], 12, $fd987193);<br> FF (c, d, a, b, Block[14], 17, $a679438e);<br> FF (b, c, d, a, Block[15], 22, $49b40821);<br> GG (a, b, c, d, Block[ 1], 5, $f61e2562);<br> GG (d, a, b, c, Block[ 6], 9, $c040b340);<br> GG (c, d, a, b, Block[11], 14, $265e5a51);<br> GG (b, c, d, a, Block[ 0], 20, $e9b6c7aa);<br> GG (a, b, c, d, Block[ 5], 5, $d62f105d);<br> GG (d, a, b, c, Block[10], 9, $2441453);<br> GG (c, d, a, b, Block[15], 14, $d8a1e681);<br> GG (b, c, d, a, Block[ 4], 20, $e7d3fbc8);<br> GG (a, b, c, d, Block[ 9], 5, $21e1cde6);<br> GG (d, a, b, c, Block[14], 9, $c33707d6);<br> GG (c, d, a, b, Block[ 3], 14, $f4d50d87);<br> GG (b, c, d, a, Block[ 8], 20, $455a14ed);<br> GG (a, b, c, d, Block[13], 5, $a9e3e905);<br> GG (d, a, b, c, Block[ 2], 9, $fcefa3f8);<br> GG (c, d, a, b, Block[ 7], 14, $676f02d9);<br> GG (b, c, d, a, Block[12], 20, $8d2a4c8a);<br> HH (a, b, c, d, Block[ 5], 4, $fffa3942);<br> HH (d, a, b, c, Block[ 8], 11, $8771f681);<br> HH (c, d, a, b, Block[11], 16, $6d9d6122);<br> HH (b, c, d, a, Block[14], 23, $fde5380c);<br> HH (a, b, c, d, Block[ 1], 4, $a4beea44);<br> HH (d, a, b, c, Block[ 4], 11, $4bdecfa9);<br> HH (c, d, a, b, Block[ 7], 16, $f6bb4b60);<br> HH (b, c, d, a, Block[10], 23, $bebfbc70);<br> HH (a, b, c, d, Block[13], 4, $289b7ec6);<br> HH (d, a, b, c, Block[ 0], 11, $eaa127fa);<br> HH (c, d, a, b, Block[ 3], 16, $d4ef3085);<br> HH (b, c, d, a, Block[ 6], 23, $4881d05);<br> HH (a, b, c, d, Block[ 9], 4, $d9d4d039);<br> HH (d, a, b, c, Block[12], 11, $e6db99e5);<br> HH (c, d, a, b, Block[15], 16, $1fa27cf8);<br> HH (b, c, d, a, Block[ 2], 23, $c4ac5665);<br> II (a, b, c, d, Block[ 0], 6, $f4292244);<br> II (d, a, b, c, Block[ 7], 10, $432aff97);<br> II (c, d, a, b, Block[14], 15, $ab9423a7);<br> II (b, c, d, a, Block[ 5], 21, $fc93a039);<br> II (a, b, c, d, Block[12], 6, $655b59c3);<br> II (d, a, b, c, Block[ 3], 10, $8f0ccc92);<br> II (c, d, a, b, Block[10], 15, $ffeff47d);<br> II (b, c, d, a, Block[ 1], 21, $85845dd1);<br> II (a, b, c, d, Block[ 8], 6, $6fa87e4f);<br> II (d, a, b, c, Block[15], 10, $fe2ce6e0);<br> II (c, d, a, b, Block[ 6], 15, $a3014314);<br> II (b, c, d, a, Block[13], 21, $4e0811a1);<br> II (a, b, c, d, Block[ 4], 6, $f7537e82);<br> II (d, a, b, c, Block[11], 10, $bd3af235);<br> II (c, d, a, b, Block[ 2], 15, $2ad7d2bb);<br> II (b, c, d, a, Block[ 9], 21, $eb86d391);<br> inc(State[0], a);<br> inc(State[1], b);<br> inc(State[2], c);<br> inc(State[3], d);<br>end;<br><br>// -----------------------------------------------------------------------------------------------<br><br>// Initialize given Context<br>procedure MD5Init(var Context: MD5Context);<br>begin<br> with Context do begin<br> State[0] := $67452301;<br> State[1] := $efcdab89;<br> State[2] := $98badcfe;<br> State[3] := $10325476;<br> Count[0] := 0;<br> Count[1] := 0;<br> ZeroMemory(@Buffer, SizeOf(MD5Buffer));<br> end;<br>end;<br><br>// Update given Context to include Length bytes of Input<br>procedure MD5Update(var Context: MD5Context; Input: pChar; Length: longword);<br>var<br> Index: longword;<br> PartLen: longword;<br> I: longword;<br>begin<br> with Context do begin<br> Index := (Count[0] shr 3) and $3f;<br> inc(Count[0], Length shl 3);<br> if Count[0] < (Length shl 3) then inc(Count[1]);<br> inc(Count[1], Length shr 29);<br> end;<br> PartLen := 64 - Index;<br> if Length >= PartLen then begin<br> CopyMemory(@Context.Buffer[Index], Input, PartLen);<br> Transform(@Context.Buffer, Context.State);<br> I := PartLen;<br> while I + 63 < Length do begin<br> Transform(@Input, Context.State);<br> inc(I, 64);<br> end;<br> Index := 0;<br> end else I := 0;<br> CopyMemory(@Context.Buffer[Index], @Input, Length - I);<br>end;<br><br>// Finalize given Context, create Digest and zeroize Context<br>procedure MD5Final(var Context: MD5Context; var Digest: MD5Digest);<br>var<br> Bits: MD5CBits;<br> Index: longword;<br> PadLen: longword;<br>begin<br> Decode(@Context.Count, @Bits, 2);<br> Index := (Context.Count[0] shr 3) and $3f;<br> if Index < 56 then PadLen := 56 - Index else PadLen := 120 - Index;<br> MD5Update(Context, @PADDING, PadLen);<br> MD5Update(Context, @Bits, 8);<br> Decode(@Context.State, @Digest, 4);<br> ZeroMemory(@Context, SizeOf(MD5Context));<br>end;<br><br>// -----------------------------------------------------------------------------------------------<br><br>// Create digest of given Message<br>function MD5String(M: string): MD5Digest;<br>var<br> Context: MD5Context;<br>begin<br> MD5Init(Context);<br> MD5Update(Context, pChar(M), length(M));<br> MD5Final(Context, Result);<br>end;<br><br>// Create digest of file with given Name<br>function MD5File(N: string): MD5Digest;<br>var<br> FileHandle: THandle;<br> MapHandle: THandle;<br> ViewPointer: pointer;<br> Context: MD5Context;<br>begin<br> MD5Init(Context);<br> FileHandle := CreateFile(pChar(N), GENERIC_READ, FILE_SHARE_READ or FILE_SHARE_WRITE,<br> nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL or FILE_FLAG_SEQUENTIAL_SCAN, 0);<br> if FileHandle <> INVALID_HANDLE_VALUE then try<br> MapHandle := CreateFileMapping(FileHandle, nil, PAGE_READONLY, 0, 0, nil);<br> if MapHandle <> 0 then try<br> ViewPointer := MapViewOfFile(MapHandle, FILE_MAP_READ, 0, 0, 0);<br> if ViewPointer <> nil then try<br> MD5Update(Context, ViewPointer, GetFileSize(FileHandle, nil));<br> finally<br> UnmapViewOfFile(ViewPointer);<br> end;<br> finally<br> CloseHandle(MapHandle);<br> end;<br> finally<br> CloseHandle(FileHandle);<br> end;<br> MD5Final(Context, Result);<br>end;<br><br>// Create hex representation of given Digest<br>function MD5Print(D: MD5Digest): string;<br>var<br> I: byte;<br>const<br> Digits: array[0..15] of char =<br> ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');<br>begin<br> Result := '';<br> for I := 0 to 15 do Result := Result + Digits[(D shr 4) and $0f] + Digits[D and $0f];<br>end;<br><br>// -----------------------------------------------------------------------------------------------<br><br>// Compare two Digests<br>function MD5Match(D1, D2: MD5Digest): boolean;<br>var<br> I: byte;<br>begin<br> I := 0;<br> Result := TRUE;<br> while Result and (I < 16) do begin<br> Result := D1 = D2;<br> inc(I);<br> end;<br>end;<br><br>end.