InraPorc

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// -----------------------------------------------------------------------------------------------

//

//                                 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!

// -----------------------------------------------------------------------------------------------

//

//     14-Jun-97  mf  Implemented MD5 according to RFC 1321                           RFC 1321

//     16-Jun-97  mf  Initial release of the compiled unit (no source code)           RFC 1321

//     28-Feb-99  mf  Added MD5Match function for comparing two digests               RFC 1321

//     13-Sep-99  mf  Reworked the entire unit                                        RFC 1321

//     17-Sep-99  mf  Reworked the "Test Driver" project                              RFC 1321

//     19-Sep-99  mf  Release of sources for MD5 unit and "Test Driver" project       RFC 1321

//

// -----------------------------------------------------------------------------------------------

//                   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 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 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;

        MD5String: string;

const

        Digits: array[0..15] of char =

                ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');

begin

        MD5String := '';

        for I := 0 to 15 do MD5String := MD5String + Digits[(D[I] shr 4) and $0f] + Digits[D[I] and $0f];

        Result := Copy(MD5String, 1, 8) + '-' + Copy(MD5String, 9, 8) + '-' + Copy(MD5String, 17, 8) + '-' + Copy(MD5String, 25, 8);

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;

end.