کد:
unit md5;
interface
type
*MD5Digest = array[0..15] of Byte;
*MD5State = array[0..3] of LongWord;
*MD5Buffer = array[0..63] of Byte;
*TMD5 = class
*private
* *FState: MD5State;
* *FCount: Int64;
* *FBuffer: MD5Buffer;
*public
* *constructor Create;
* *procedure Update(const Input; Length: Cardinal);
* *function Final: MD5Digest;
*end;
*
function MD5Message(const Message; Length: Cardinal): MD5Digest;
function MD5String(const S: string): MD5Digest;
function MD5File(const FileName: string): MD5Digest;
function MD5Print(const D: MD5Digest): string;
implementation
{$IFDEF MSWINDOWS}
uses
*Windows;
{$ENDIF} * * * * * *
function ROL(X: LongWord; Count: Integer): LongWord;
{$IFDEF PUREPASCAL}
begin
*Result := (X shl Count) or (X shr (32 - Count));
end;
{$ELSE}
asm
* * * *MOV * * ECX,EDX
* * * *ROL * * EAX,CL
end;
{$ENDIF}
type
*MD5Iters = 0..63;
var
*k: array[MD5Iters] of Integer;
*T: array[MD5Iters] of LongWord;
*s: array[MD5Iters] of Integer;
procedure InitLUTs;
const
*A: array[0..15] of Integer =
* *(
* * *7, 12, 17, 22,
* * *5, *9, 14, 20,
* * *4, 11, 16, 23,
* * *6, 10, 15, 21
* *);
var
*I: Integer;
begin
*for I := 0 to 63 do
*begin
* *case I of
* * *0..15: k[I] := I;
* * *16..31: k[I] := (5 * I + 1) and $f;
* * *32..47: k[I] := (3 * I + 5) and $f;
* * *48..63: k[I] := (7 * I) and $f;
* *end;
* *T[I] := Trunc(Abs(Sin(I + 1)) * $100000000);
* *s[I] := A[I shr 2 and $c or I and $3];
*end;
end;
// MD5 basic transformation. Transforms state based on block.
procedure Transform(var State: MD5State; const Block);
var
*X: array[0..15] of LongWord absolute Block;
*a, b, c, d, i, f, temp: LongWord;
begin
*f := 0;
*a := State[0];
*b := State[1];
*c := State[2];
*d := State[3];
*for i := 0 to 63 do
*begin
* *case i of
* * *0..15: f := d xor (b and (c xor d));
* * *16..31: f := c xor (d and (b xor c));
* * *32..47: f := b xor c xor d;
* * *48..63: f := c xor (b or (not d));
* *end;
* *temp := d;
* *d := c;
* *c := b;
* *Inc(b, ROL(a + f + X[k] + T, s));
* *a := temp;
*end;
*Inc(State[0], a);
*Inc(State[1], b);
*Inc(State[2], c);
*Inc(State[3], d);
end;
{ TMD5 }
constructor TMD5.Create;
begin
*FState[0] := $67452301;
*FState[1] := $efcdab89;
*FState[2] := $98badcfe;
*FState[3] := $10325476;
end;
type
*Bytes = array[0..0] of Byte;
procedure TMD5.Update(const Input; Length: Cardinal);
var
*I, Index, PartLen: Cardinal;
begin
*Index := FCount and $3f;
*Inc(FCount, Length);
*PartLen := 64 - Index;
*if Length >= PartLen then
*begin
* *Move(Input, FBuffer[Index], PartLen);
* *Transform(FState, FBuffer);
* *I := PartLen;
* *while I + 63 < Length do
* *begin
* * *Transform(FState, Bytes(Input)[I]);
* * *Inc(I, 64);
* *end;
* *Index := 0;
*end
*else
* *I := 0;
*Move(Bytes(Input)[I], FBuffer[Index], Length - I);
end;
function TMD5.Final: MD5Digest;
var
*BitLength: Int64;
*Padding: MD5Buffer;
*PadLen: Integer;
begin
*BitLength := FCount shl 3;
*PadLen := (119 - FCount and $3f) and $3f + 1;
*FillChar(Padding, PadLen, 0);
*Padding[0] := $80;
*Update(Padding, PadLen);
*Update(BitLength, SizeOf(Int64));
*Result := MD5Digest(FState);
*Free;
end;
// ----------------------------------------------------------------------------
function MD5Message(const Message; Length: Cardinal): MD5Digest;
begin
*with TMD5.Create do
* *try
* * *Update(Message, Length);
* * *Result := Final;
* *except
* * *Free;
* * *raise;
* *end;
end;
function MD5String(const S: string): MD5Digest;
begin
*Result := MD5Message(Pointer(S)^, Length(S));
end;
function MD5File(const FileName: string): MD5Digest;
{$IFDEF MSWINDOWS}
var
*FileHandle: THandle;
*MapHandle: THandle;
*ViewPointer: Pointer;
{$ENDIF}
begin
*FillChar(Result, SizeOf(MD5Digest), 0);
{$IFDEF MSWINDOWS}
*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
* * * * * * *Result := MD5Message(ViewPointer^, GetFileSize(FileHandle, nil));
* * * * * *finally
* * * * * * *UnmapViewOfFile(ViewPointer);
* * * * * *end;
* * * *finally
* * * * *CloseHandle(MapHandle);
* * * *end;
* *finally
* * *CloseHandle(FileHandle);
* *end;
{$ENDIF}
end;
function MD5Print(const D: MD5Digest): string;
const
*Digits: array[0..15] of Char =("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f");
var
*I: Integer;
*TempStr: string[32];
begin
*TempStr := "";
*for I := 0 to 15 do
* *TempStr := TempStr + Digits[D[I] shr 4] + Digits[D[I] and $f];
*Result := TempStr;
end;
initialization
*InitLUTs;
end.
پاسخ با نقل قول
علاقه مندي ها (Bookmarks)