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Tecsitel_FactuGES2/Source/Base/Utiles/uMD5.pas

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{******************************************************************}
{ MD5 Hashsum Evaluation Unit For Borland Delphi }
{ }
{ Copyright © 2002 by Dimka Maslov }
{ E-mail: mail@endimus.com, }
{ Web-site: http://www.endimus.com }
{ }
{ Derived from the RSA Data Security, Inc. }
{ MD5 Message-Digest Algorithm described in RFC 1321 }
{ http://www.faqs.org/rfcs/rfc1321.html }
{******************************************************************}
unit uMD5;
interface
uses Windows, SysUtils, Classes;
type
{ The TMD5Digest record is the type of results of
the MD5 hashsum evaluation functions. The contents
of a record may be used as four 32-bit integer values
or as an array of 16 bytes }
PMD5Digest = ^TMD5Digest;
TMD5Digest = record
case Integer of
0: (A, B, C, D: LongInt);
1: (v: array [0..15] of Byte);
end;
{ The MD5String function evaluates the MD5 hashsum for
a string. The S parameter specifies a string to
evaluate hashsum }
function MD5String(const S: string): TMD5Digest;
{ The MD5File function evaluates the MD5 hashsum for
a file. The FileName parameter specifies the name
of a file to evaluate hashsum }
function MD5File(const FileName: string): TMD5Digest;
{ The MD5Stream function evaluates the MD5 hashsum for
a stream. The Stream parameters specifies the
TStream descendant class object to evaluate hashsum }
function MD5Stream(const Stream: TStream): TMD5Digest;
{ The MD5Buffer function evaluates the MD5 hashsum for
any memory buffer. The Buffer parameters specifies a
buffer to evaluate hashsum. The Size parameter specifies
the size (in bytes) of a buffer }
function MD5Buffer(const Buffer; Size: Integer): TMD5Digest;
{ The MD5DigestToStr function converts the result of
a hashsum evaluation function into a string of
hexadecimal digits }
function MD5DigestToStr(const Digest: TMD5Digest): string;
{ The MD5DigestCompare function compares two
TMD5Digest record variables. This function returns
TRUE if parameters are equal or FALSE otherwise }
function MD5DigestCompare(const Digest1, Digest2: TMD5Digest): Boolean;
implementation
{
Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
rights reserved.
License to copy and use this software is granted provided that it
is identified as the "RSA Data Security, Inc. MD5 Message-Digest
Algorithm" in all material mentioning or referencing this software
or this function.
License is also granted to make and use derivative works provided
that such works are identified as "derived from the RSA Data
Security, Inc. MD5 Message-Digest Algorithm" in all material
mentioning or referencing the derived work.
RSA Data Security, Inc. makes no representations concerning either
the merchantability of this software or the suitability of this
software for any particular purpose. It is provided "as is"
without express or implied warranty of any kind.
These notices must be retained in any copies of any part of this
documentation and/or software.
}
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.
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