unit MD5;
interface
uses
Windows,SysUtils;
//自定函数 计算字符串的MD5值
function StrToMD5(str:string):string; //计算字符串的MD5值
function FileToMD5(FilePath:string):string; //计算文件的MD5值
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;
// -----------------------------------------------------------------------------------------------
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;
function StrToMD5(str:string):string;
begin
result:= UpperCase(MD5Print(MD5String(str)),',',');
end;
function FileToMD5(FilePath:string):string;
begin
result:= UpperCase(MD5Print(MD5File(FilePath)),',',');
end;
end.
