我使用一个源自http://www.fichtner.net/delphi/的md5程式，直接使用在exe项目中都正确无误；但一旦包在dll或bpl项目中来调用就会有Integer Overflow。 请各位大大帮忙看看！ md5.pas源码

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;
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;    end.

Justin Shen ================================= 如果能帮到您,我会很开心;如果能得到您的帮助，是我的荣幸 ================================= 發表人 - JustinShen 於 2005/07/15 12:40:47 發表人 - JustinShen 於 2005/07/15 12:45:00

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我为一切作努力！
Justin Shen