md5 кодирование
md5 кодирование
md5 кодирование Шифрование данных Function md5(s:string):string; var a:array[0..15] of byte; i:integer; LenHi, LenLo: longword; Index: DWord; HashBuffer: array[0..63] of byte; CurrentHash: array[0..3] of DWord; procedure Burn; begin LenHi:= 0; LenLo:= 0; Index:= 0; FillChar(HashBuffer,Sizeof(HashBuffer),0); FillChar(CurrentHash,Sizeof(CurrentHash),0); end; procedure Init; begin Burn; CurrentHash[0]:= $67452301; CurrentHash[1]:= $efcdab89; CurrentHash[2]:= $98badcfe; CurrentHash[3]:= $10325476; end; function LRot32(a, b: longword): longword; begin Result:= (a shl b) or (a shr (32-b)); end; procedure Compress; var Data: array[0..15] of dword; A, B, C, D: dword; begin Move(HashBuffer,Data,Sizeof(Data)); A:= CurrentHash[0]; B:= CurrentHash[1]; C:= CurrentHash[2]; D:= CurrentHash[3]; A:= B + LRot32(A + (D xor (B and (C xor D))) + Data[ 0] + $d76aa478,7); D:= A + LRot32(D + (C xor (A and (B xor C))) + Data[ 1] + $e8c7b756,12); C:= D + LRot32(C + (B xor (D and (A xor B))) + Data[ 2] + $242070db,17); B:= C + LRot32(B + (A xor (C and (D xor A))) + Data[ 3] + $c1bdceee,22); A:= B + LRot32(A + (D xor (B and (C xor D))) + Data[ 4] + $f57c0faf,7); D:= A + LRot32(D + (C xor (A and (B xor C))) + Data[ 5] + $4787c62a,12); C:= D + LRot32(C + (B xor (D and (A xor B))) + Data[ 6] + $a8304613,17); B:= C + LRot32(B + (A xor (C and (D xor A))) + Data[ 7] + $fd469501,22); A:= B + LRot32(A + (D xor (B and (C xor D))) + Data[ 8] + $698098d8,7); D:= A + LRot32(D + (C xor (A and (B xor C))) + Data[ 9] + $8b44f7af,12); C:= D + LRot32(C + (B xor (D and (A xor B))) + Data[10] + $ffff5bb1,17); B:= C + LRot32(B + (A xor (C and (D xor A))) + Data[11] + $895cd7be,22); A:= B + LRot32(A + (D xor (B and (C xor D))) + Data[12] + $6b901122,7); D:= A + LRot32(D + (C xor (A and (B xor C))) + Data[13] + $fd987193,12); C:= D + LRot32(C + (B xor (D and (A xor B))) + Data[14] + $a679438e,17); B:= C + LRot32(B + (A xor (C and (D xor A))) + Data[15] + $49b40821,22); A:= B + LRot32(A + (C xor (D and (B xor C))) + Data[ 1] + $f61e2562,5); D:= A + LRot32(D + (B xor (C and (A xor B))) + Data[ 6] + $c040b340,9); C:= D + LRot32(C + (A xor (B and (D xor A))) + Data[11] + $265e5a51,14); B:= C + LRot32(B + (D xor (A and (C xor D))) + Data[ 0] + $e9b6c7aa,20); A:= B + LRot32(A + (C xor (D and (B xor C))) + Data[ 5] + $d62f105d,5); D:= A + LRot32(D + (B xor (C and (A xor B))) + Data[10] + $02441453,9); C:= D + LRot32(C + (A xor (B and (D xor A))) + Data[15] + $d8a1e681,14); B:= C + LRot32(B + (D xor (A and (C xor D))) + Data[ 4] + $e7d3fbc8,20); A:= B + LRot32(A + (C xor (D and (B xor C))) + Data[ 9] + $21e1cde6,5); D:= A + LRot32(D + (B xor (C and (A xor B))) + Data[14] + $c33707d6,9); C:= D + LRot32(C + (A xor (B and (D xor A))) + Data[ 3] + $f4d50d87,14); B:= C + LRot32(B + (D xor (A and (C xor D))) + Data[ 8] + $455a14ed,20); A:= B + LRot32(A + (C xor (D and (B xor C))) + Data[13] + $a9e3e905,5); D:= A + LRot32(D + (B xor (C and (A xor B))) + Data[ 2] + $fcefa3f8,9); C:= D + LRot32(C + (A xor (B and (D xor A))) + Data[ 7] + $676f02d9,14); B:= C + LRot32(B + (D xor (A and (C xor D))) + Data[12] + $8d2a4c8a,20); A:= B + LRot32(A + (B xor C xor D) + Data[ 5] + $fffa3942,4); D:= A + LRot32(D + (A xor B xor C) + Data[ 8] + $8771f681,11); C:= D + LRot32(C + (D xor A xor B) + Data[11] + $6d9d6122,16); B:= C + LRot32(B + (C xor D xor A) + Data[14] + $fde5380c,23); A:= B + LRot32(A + (B xor C xor D) + Data[ 1] + $a4beea44,4); D:= A + LRot32(D + (A xor B xor C) + Data[ 4] + $4bdecfa9,11); C:= D + LRot32(C + (D xor A xor B) + Data[ 7] + $f6bb4b60,16); B:= C + LRot32(B + (C xor D xor A) + Data[10] + $bebfbc70,23); A:= B + LRot32(A + (B xor C xor D) + Data[13] + $289b7ec6,4); D:= A + LRot32(D + (A xor B xor C) + Data[ 0] + $eaa127fa,11); C:= D + LRot32(C + (D xor A xor B) + Data[ 3] + $d4ef3085,16); B:= C + LRot32(B + (C xor D xor A) + Data[ 6] + $04881d05,23); A:= B + LRot32(A + (B xor C xor D) + Data[ 9] + $d9d4d039,4); D:= A + LRot32(D + (A xor B xor C) + Data[12] + $e6db99e5,11); C:= D + LRot32(C + (D xor A xor B) + Data[15] + $1fa27cf8,16); B:= C + LRot32(B + (C xor D xor A) + Data[ 2] + $c4ac5665,23); A:= B + LRot32(A + (C xor (B or (not D))) + Data[ 0] + $f4292244,6); D:= A + LRot32(D + (B xor (A or (not C))) + Data[ 7] + $432aff97,10); C:= D + LRot32(C + (A xor (D or (not B))) + Data[14] + $ab9423a7,15); B:= C + LRot32(B + (D xor (C or (not A))) + Data[ 5] + $fc93a039,21); A:= B + LRot32(A + (C xor (B or (not D))) + Data[12] + $655b59c3,6); D:= A + LRot32(D + (B xor (A or (not C))) + Data[ 3] + $8f0ccc92,10); C:= D + LRot32(C + (A xor (D or (not B))) + Data[10] + $ffeff47d,15); B:= C + LRot32(B + (D xor (C or (not A))) + Data[ 1] + $85845dd1,21); A:= B + LRot32(A + (C xor (B or (not D))) + Data[ 8] + $6fa87e4f,6); D:= A + LRot32(D + (B xor (A or (not C))) + Data[15] + $fe2ce6e0,10); C:= D + LRot32(C + (A xor (D or (not B))) + Data[ 6] + $a3014314,15); B:= C + LRot32(B + (D xor (C or (not A))) + Data[13] + $4e0811a1,21); A:= B + LRot32(A + (C xor (B or (not D))) + Data[ 4] + $f7537e82,6); D:= A + LRot32(D + (B xor (A or (not C))) + Data[11] + $bd3af235,10); C:= D + LRot32(C + (A xor (D or (not B))) + Data[ 2] + $2ad7d2bb,15); B:= C + LRot32(B + (D xor (C or (not A))) + Data[ 9] + $eb86d391,21); Inc(CurrentHash[0],A); Inc(CurrentHash[1],B); Inc(CurrentHash[2],C); Inc(CurrentHash[3],D); Index:= 0; FillChar(HashBuffer,Sizeof(HashBuffer),0); end; procedure Update(const Buffer; Size: longword); var PBuf: ^byte; begin Inc(LenHi,Size shr 29); Inc(LenLo,Size*8); if LenLo< (Size*8) then Inc(LenHi); PBuf:= @Buffer; while Size> 0 do begin if (Sizeof(HashBuffer)-Index)<= DWord(Size) then begin Move(PBuf^,HashBuffer[Index],Sizeof(HashBuffer)-Index); Dec(Size,Sizeof(HashBuffer)-Index); Inc(PBuf,Sizeof(HashBuffer)-Index); Compress; end else begin Move(PBuf^,HashBuffer[Index],Size); Inc(Index,Size); Size:= 0; end; end; end; procedure Final(var Digest); begin HashBuffer[Index]:= $80; if Index>= 56 then Compress; PDWord(@HashBuffer[56])^:= LenLo; PDWord(@HashBuffer[60])^:= LenHi; Compress; Move(CurrentHash,Digest,Sizeof(CurrentHash)); Burn; end; begin Init; Update(s[1],Length(s)); Final(a); result:=''; for i:=0 to 15 do result:=result+IntToHex(a[i],0); Burn; end;
