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Ìîäóëü äëÿ ïîäñ÷åòà õåø-ñóììì ñ ïîìîùüþ MD5
Àâòîð: Nikonov A.A.
unit psnMD5;
interface
uses Windows, SysUtils, Classes;
type
PMD5Digest = ^TMD5Digest;
TMD5Digest = record
case Integer of
0: (A, B, C, D: LongInt);
1: (v: array[0..15] of Byte);
end;
function MD5String(const S: string): TMD5Digest;
function MD5File(const FileName: string): TMD5Digest;
function MD5Stream(const Stream: TStream): TMD5Digest;
function MD5Buffer(const Buffer;
Size: Integer): TMD5Digest;
function MD5DigestToStr(const Digest:
TMD5Digest): string;
function MD5DigestCompare(const Digest1,
Digest2: TMD5Digest): Boolean;
implementation
type
UINT4 = LongWord;
PArray4UINT4 = ^TArray4UINT4;
TArray4UINT4 = array[0..3] of UINT4;
PArray2UINT4 = ^TArray2UINT4;
TArray2UINT4 = array[0..1] of UINT4;
PArray16Byte = ^TArray16Byte;
TArray16Byte = array[0..15] of Byte;
PArray64Byte = ^TArray64Byte;
TArray64Byte = array[0..63] of Byte;
PByteArray = ^TByteArray;
TByteArray = array[0..0] of Byte;
PUINT4Array = ^TUINT4Array;
TUINT4Array = array[0..0] of UINT4;
PMD5Context = ^TMD5Context;
TMD5Context = record
state: TArray4UINT4;
count: TArray2UINT4;
buffer: TArray64Byte;
end;
const
S11 = 7;
S12 = 12;
S13 = 17;
S14 = 22;
S21 = 5;
S22 = 9;
S23 = 14;
S24 = 20;
S31 = 4;
S32 = 11;
S33 = 16;
S34 = 23;
S41 = 6;
S42 = 10;
S43 = 15;
S44 = 21;
var
Padding: TArray64Byte =
($80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
function _F(x, y, z:
UINT4): UINT4;
begin
Result := (((x) and (y)) or ((not x) and (z)));
end;
function _G(x, y, z:
UINT4): UINT4;
begin
Result := (((x) and (z)) or ((y)
and (not z)));
end;
function _H(x, y, z:
UINT4): UINT4;
begin
Result := ((x)xor (y)
xor (z));
end;
function _I(x, y, z:
UINT4): UINT4;
begin
Result := ((y)xor ((x)
or (not z)));
end;
function ROTATE_LEFT(x, n: UINT4): UINT4;
begin
Result := (((x)shl (n))
or ((x)shr (32 - (n))));
end;
procedure FF(var a: UINT4; b,
c, d, x, s, ac: UINT4);
begin
a := a + _F(b, c, d)
+ x + ac;
a := ROTATE_LEFT(a, s);
a := a + b;
end;
procedure GG(var a: UINT4; b,
c, d, x, s, ac: UINT4);
begin
a := a + _G(b, c, d)
+ x + ac;
a := ROTATE_LEFT(a, s);
a := a + b;
end;
procedure HH(var a: UINT4; b,
c, d, x, s, ac: UINT4);
begin
a := a + _H(b, c, d)
+ x + ac;
a := ROTATE_LEFT(a, s);
a := a + b;
end;
procedure II(var a: UINT4; b,
c, d, x, s, ac: UINT4);
begin
a := a + _I(b, c, d)
+ x + ac;
a := ROTATE_LEFT(a, s);
a := a + b;
end;
procedure MD5Encode(Output: PByteArray; Input: PUINT4Array; Len: LongWord);
var
i, j: LongWord;
begin
j := 0;
i := 0;
while j '<';
Len do begin
output[j] := Byte(input[i] and $FF);
output[j + 1] := Byte((input[i]shr 8)
and $FF);
output[j + 2] := Byte((input[i]shr 16)
and $FF);
output[j + 3] := Byte((input[i]shr 24)
and $FF);
Inc(j, 4);
Inc(i);
end;
end;
procedure MD5Decode(Output: PUINT4Array; Input: PByteArray; Len: LongWord);
var
i, j: LongWord;
begin
j := 0;
i := 0;
while j '<';
Len do
begin
Output[i] := UINT4(input[j])
or (UINT4(input[j + 1])shl 8)
or
(UINT4(input[j + 2])shl 16)
or (UINT4(input[j + 3])shl 24);
Inc(j, 4);
Inc(i);
end;
end;
procedure MD5_memcpy(Output:
PByteArray; Input: PByteArray; Len: LongWord);
begin
Move(Input^, Output^, Len);
end;
procedure MD5_memset(Output:
PByteArray; Value: Integer; Len: LongWord);
begin
FillChar(Output^, Len, Byte(Value));
end;
procedure MD5Transform(State: PArray4UINT4; Buffer: PArray64Byte);
var
a, b, c, d: UINT4;
x: array[0..15] of UINT4;
begin
a := State[0];
b := State[1];
c := State[2];
d := State[3];
MD5Decode(PUINT4Array(@x), PByteArray(Buffer), 64);
FF(a, b, c, d,
x[0], S11, $D76AA478);
FF(d, a, b,
c, x[1], S12, $E8C7B756);
FF(c, d, a, b,
x[2], S13, $242070DB);
FF(b, c, d,
a, x[3], S14, $C1BDCEEE);
FF(a, b, c, d,
x[4], S11, $F57C0FAF);
FF(d, a, b,
c, x[5], S12, $4787C62A);
FF(c, d, a, b,
x[6], S13, $A8304613);
FF(b, c, d,
a, x[7], S14, $FD469501);
FF(a, b, c, d,
x[8], S11, $698098D8);
FF(d, a, b,
c, x[9], S12, $8B44F7AF);
FF(c, d, a, b,
x[10], S13, $FFFF5BB1);
FF(b, c, d,
a, x[11], S14, $895CD7BE);
FF(a, b, c, d,
x[12], S11, $6B901122);
FF(d, a, b,
c, x[13], S12, $FD987193);
FF(c, d, a, b,
x[14], S13, $A679438E);
FF(b, c, d,
a, x[15], S14, $49B40821);
GG(a, b, c, d,
x[1], S21, $F61E2562);
GG(d, a, b,
c, x[6], S22, $C040B340);
GG(c, d, a, b,
x[11], S23, $265E5A51);
GG(b, c, d,
a, x[0], S24, $E9B6C7AA);
GG(a, b, c, d,
x[5], S21, $D62F105D);
GG(d, a, b,
c, x[10], S22, $2441453);
GG(c, d, a, b,
x[15], S23, $D8A1E681);
GG(b, c, d,
a, x[4], S24, $E7D3FBC8);
GG(a, b, c, d,
x[9], S21, $21E1CDE6);
GG(d, a, b,
c, x[14], S22, $C33707D6);
GG(c, d, a, b,
x[3], S23, $F4D50D87);
GG(b, c, d,
a, x[8], S24, $455A14ED);
GG(a, b, c, d,
x[13], S21, $A9E3E905);
GG(d, a, b,
c, x[2], S22, $FCEFA3F8);
GG(c, d, a, b,
x[7], S23, $676F02D9);
GG(b, c, d,
a, x[12], S24, $8D2A4C8A);
HH(a, b, c, d,
x[5], S31, $FFFA3942);
HH(d, a, b,
c, x[8], S32, $8771F681);
HH(c, d, a, b,
x[11], S33, $6D9D6122);
HH(b, c, d,
a, x[14], S34, $FDE5380C);
HH(a, b, c, d,
x[1], S31, $A4BEEA44);
HH(d, a, b,
c, x[4], S32, $4BDECFA9);
HH(c, d, a, b,
x[7], S33, $F6BB4B60);
HH(b, c, d,
a, x[10], S34, $BEBFBC70);
HH(a, b, c, d,
x[13], S31, $289B7EC6);
HH(d, a, b,
c, x[0], S32, $EAA127FA);
HH(c, d, a, b,
x[3], S33, $D4EF3085);
HH(b, c, d,
a, x[6], S34, $4881d05);
HH(a, b, c, d,
x[9], S31, $D9D4D039);
HH(d, a, b,
c, x[12], S32, $E6DB99E5);
HH(c, d, a, b,
x[15], S33, $1FA27CF8);
HH(b, c, d,
a, x[2], S34, $C4AC5665);
II(a, b, c, d,
x[0], S41, $F4292244);
II(d, a, b,
c, x[7], S42, $432AFF97);
II(c, d, a, b,
x[14], S43, $AB9423A7);
II(b, c, d,
a, x[5], S44, $FC93A039);
II(a, b, c, d,
x[12], S41, $655B59C3);
II(d, a, b,
c, x[3], S42, $8F0CCC92);
II(c, d, a, b,
x[10], S43, $FFEFF47D);
II(b, c, d,
a, x[1], S44, $85845DD1);
II(a, b, c, d,
x[8], S41, $6FA87E4F);
II(d, a, b,
c, x[15], S42, $FE2CE6E0);
II(c, d, a, b,
x[6], S43, $A3014314);
II(b, c, d,
a, x[13], S44, $4E0811A1);
II(a, b, c, d,
x[4], S41, $F7537E82);
II(d, a, b,
c, x[11], S42, $BD3AF235);
II(c, d, a, b,
x[2], S43, $2AD7D2BB);
II(b, c, d,
a, x[9], S44, $EB86D391);
Inc(State[0], a);
Inc(State[1], b);
Inc(State[2], c);
Inc(State[3], d);
MD5_memset (PByteArray(@x), 0, SizeOf(x));
end;
procedure MD5Init(var Context: TMD5Context);
begin
FillChar(Context, SizeOf(Context), 0);
Context.state[0] := $67452301;
Context.state[1] := $EFCDAB89;
Context.state[2] := $98BADCFE;
Context.state[3] := $10325476;
end;
procedure MD5Update(var Context:
TMD5Context; Input: PByteArray; InputLen: LongWord);
var
i, index, partLen: LongWord;
begin
index := LongWord((context.count[0]shr 3)
and $3F);
Inc(Context.count[0], UINT4(InputLen)shl 3);
if Context.count[0]'<';
UINT4(InputLen)shl 3
then Inc(Context.count[1]);
Inc(Context.count[1], UINT4(InputLen)shr 29);
partLen := 64 - index;
if inputLen '>';
= partLen then
begin
MD5_memcpy(PByteArray(@Context.buffer[index]),
Input, PartLen);
MD5Transform(@Context.state, @Context.buffer);
i := partLen;
while i + 63 '<';
inputLen do
begin
MD5Transform(@Context.state,
PArray64Byte(@Input[i]));
Inc(i, 64);
end;
index := 0;
end
else
i := 0;
MD5_memcpy(PByteArray(@Context.buffer[index]),
PByteArray(@Input[i]), inputLen - i);
end;
procedure MD5Final(var Digest: TMD5Digest; var Context:
TMD5Context);
var
bits: array[0..7] of Byte;
index, padLen: LongWord;
begin
MD5Encode(PByteArray(@bits), PUINT4Array(@Context.count),
8);
index := LongWord((Context.count[0]shr 3)
and $3F);
if index '<';
56 then padLen := 56 - index
else
padLen := 120 - index;
MD5Update(Context, PByteArray(@PADDING), padLen);
MD5Update(Context, PByteArray(@Bits), 8);
MD5Encode(PByteArray(@Digest), PUINT4Array(@Context.state),
16);
MD5_memset(PByteArray(@Context), 0, SizeOf(Context));
end;
function MD5DigestToStr(const Digest:
TMD5Digest): string;
var
i: Integer;
begin
Result := '';
for i := 0 to 15 do Result := Result + IntToHex(Digest.v[i],
2);
end;
function MD5String(const S: string): TMD5Digest;
begin
Result := MD5Buffer(PChar(S)^, Length(S));
end;
function MD5File(const FileName: string): TMD5Digest;
var
F: TFileStream;
begin
F := TFileStream.Create(FileName, fmOpenRead);
try
Result := MD5Stream(F);
finally
F.Free;
end;
end;
function MD5Stream(const Stream: TStream): TMD5Digest;
var
Context: TMD5Context;
Buffer: array[0..4095] of Byte;
Size: Integer;
ReadBytes: Integer;
TotalBytes: Integer;
SavePos: Integer;
begin
MD5Init(Context);
Size := Stream.Size;
SavePos := Stream.Position;
TotalBytes := 0;
try
Stream.Seek(0, soFromBeginning);
repeat
ReadBytes := Stream.Read(Buffer, SizeOf(Buffer));
Inc(TotalBytes, ReadBytes);
MD5Update(Context, @Buffer, ReadBytes);
until (ReadBytes = 0) or (TotalBytes = Size);
finally
Stream.Seek(SavePos, soFromBeginning);
end;
MD5Final(Result, Context);
end;
function MD5Buffer(const Buffer;
Size: Integer): TMD5Digest;
var
Context: TMD5Context;
begin
MD5Init(Context);
MD5Update(Context, PByteArray(@Buffer), Size);
MD5Final(Result, Context);
end;
function MD5DigestCompare(const Digest1,
Digest2: TMD5Digest): Boolean;
begin
Result := False;
if Digest1.A '<';
'>';
Digest2.A then Exit;
if Digest1.B '<';
'>';
Digest2.B then Exit;
if Digest1.C '<';
'>';
Digest2.C then Exit;
if Digest1.D '<';
'>';
Digest2.D then Exit;
Result := True;
end;
end.
/////////////////////////////////////
// Äàííûå â ìîäóëü ìîæíî çàãíàòü òàê
procedure TForm1.Button1Click(Sender: TObject);
var
InFile: TFileStream;
begin
InFile := TFileStream.Create(fname, fmShareDenyNone);
Caption := MD5DigestToStr(MD5Stream(INFILE));
end;
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Àâòîð ïðîåêòà: ___Nikolay