Всем известно что в PHP есть встроенная функция MD5 для расчета MD5 хеша. Но как быть, если нужно посчитать MD5 хеш с измененными значениями инициализирующего вектора или другими изменениями? Ниже приводится вариант исходного кода расчета MD5 на "чистом PHP", т.е. фактически мы переписали функцию MD5:
Результатом выполнения данного кода будет:
5cbcef02af47abc758c4d88ea5316f52
5cbcef02af47abc758c4d88ea5316f52
Т.о. мы видим, что написанная нами функция MD считает MD5 хеш точно также, как и встроенная md5(). Ч.т.д.
<?php
function MD($string){
$a = "67452301";
$b = "efcdab89";
$c = "98badcfe";
$d = "10325476";
$A = $a ;
$B = $b ;
$C = $c ;
$D = $d ;
$words = ConvertToArray($string);
for($i = 0; $i <= count($words)/16-1; $i++){
$a = $A;
$b = $B;
$c = $C;
$d = $D;
/* ROUND 1 */
FF ($A, $B, $C, $D, $words[0 + ($i * 16)], 7, "d76aa478");
FF ($D, $A, $B, $C, $words[1 + ($i * 16)], 12, "e8c7b756");
FF ($C, $D, $A, $B, $words[2 + ($i * 16)], 17, "242070db");
FF ($B, $C, $D, $A, $words[3 + ($i * 16)], 22, "c1bdceee");
FF ($A, $B, $C, $D, $words[4 + ($i * 16)], 7, "f57c0faf");
FF ($D, $A, $B, $C, $words[5 + ($i * 16)], 12, "4787c62a");
FF ($C, $D, $A, $B, $words[6 + ($i * 16)], 17, "a8304613");
FF ($B, $C, $D, $A, $words[7 + ($i * 16)], 22, "fd469501");
FF ($A, $B, $C, $D, $words[8 + ($i * 16)], 7, "698098d8");
FF ($D, $A, $B, $C, $words[9 + ($i * 16)], 12, "8b44f7af");
FF ($C, $D, $A, $B, $words[10 + ($i * 16)], 17, "ffff5bb1");
FF ($B, $C, $D, $A, $words[11 + ($i * 16)], 22, "895cd7be");
FF ($A, $B, $C, $D, $words[12 + ($i * 16)], 7, "6b901122");
FF ($D, $A, $B, $C, $words[13 + ($i * 16)], 12, "fd987193");
FF ($C, $D, $A, $B, $words[14 + ($i * 16)], 17, "a679438e");
FF ($B, $C, $D, $A, $words[15 + ($i * 16)], 22, "49b40821");
/* ROUND 2 */
GG ($A, $B, $C, $D, $words[1 + ($i * 16)], 5, "f61e2562");
GG ($D, $A, $B, $C, $words[6 + ($i * 16)], 9, "c040b340");
GG ($C, $D, $A, $B, $words[11 + ($i * 16)], 14, "265e5a51");
GG ($B, $C, $D, $A, $words[0 + ($i * 16)], 20, "e9b6c7aa");
GG ($A, $B, $C, $D, $words[5 + ($i * 16)], 5, "d62f105d");
GG ($D, $A, $B, $C, $words[10 + ($i * 16)], 9, "2441453");
GG ($C, $D, $A, $B, $words[15 + ($i * 16)], 14, "d8a1e681");
GG ($B, $C, $D, $A, $words[4 + ($i * 16)], 20, "e7d3fbc8");
GG ($A, $B, $C, $D, $words[9 + ($i * 16)], 5, "21e1cde6");
GG ($D, $A, $B, $C, $words[14 + ($i * 16)], 9, "c33707d6");
GG ($C, $D, $A, $B, $words[3 + ($i * 16)], 14, "f4d50d87");
GG ($B, $C, $D, $A, $words[8 + ($i * 16)], 20, "455a14ed");
GG ($A, $B, $C, $D, $words[13 + ($i * 16)], 5, "a9e3e905");
GG ($D, $A, $B, $C, $words[2 + ($i * 16)], 9, "fcefa3f8");
GG ($C, $D, $A, $B, $words[7 + ($i * 16)], 14, "676f02d9");
GG ($B, $C, $D, $A, $words[12 + ($i * 16)], 20, "8d2a4c8a");
/* ROUND 3 */
HH ($A, $B, $C, $D, $words[5 + ($i * 16)], 4, "fffa3942");
HH ($D, $A, $B, $C, $words[8 + ($i * 16)], 11, "8771f681");
HH ($C, $D, $A, $B, $words[11 + ($i * 16)], 16, "6d9d6122");
HH ($B, $C, $D, $A, $words[14 + ($i * 16)], 23, "fde5380c");
HH ($A, $B, $C, $D, $words[1 + ($i * 16)], 4, "a4beea44");
HH ($D, $A, $B, $C, $words[4 + ($i * 16)], 11, "4bdecfa9");
HH ($C, $D, $A, $B, $words[7 + ($i * 16)], 16, "f6bb4b60");
HH ($B, $C, $D, $A, $words[10 + ($i * 16)], 23, "bebfbc70");
HH ($A, $B, $C, $D, $words[13 + ($i * 16)], 4, "289b7ec6");
HH ($D, $A, $B, $C, $words[0 + ($i * 16)], 11, "eaa127fa");
HH ($C, $D, $A, $B, $words[3 + ($i * 16)], 16, "d4ef3085");
HH ($B, $C, $D, $A, $words[6 + ($i * 16)], 23, "4881d05");
HH ($A, $B, $C, $D, $words[9 + ($i * 16)], 4, "d9d4d039");
HH ($D, $A, $B, $C, $words[12 + ($i * 16)], 11, "e6db99e5");
HH ($C, $D, $A, $B, $words[15 + ($i * 16)], 16, "1fa27cf8");
HH ($B, $C, $D, $A, $words[2 + ($i * 16)], 23, "c4ac5665");
/* ROUND 4 */
II ($A, $B, $C, $D, $words[0 + ($i * 16)], 6, "f4292244");
II ($D, $A, $B, $C, $words[7 + ($i * 16)], 10, "432aff97");
II ($C, $D, $A, $B, $words[14 + ($i * 16)], 15, "ab9423a7");
II ($B, $C, $D, $A, $words[5 + ($i * 16)], 21, "fc93a039");
II ($A, $B, $C, $D, $words[12 + ($i * 16)], 6, "655b59c3");
II ($D, $A, $B, $C, $words[3 + ($i * 16)], 10, "8f0ccc92");
II ($C, $D, $A, $B, $words[10 + ($i * 16)], 15, "ffeff47d");
II ($B, $C, $D, $A, $words[1 + ($i * 16)], 21, "85845dd1");
II ($A, $B, $C, $D, $words[8 + ($i * 16)], 6, "6fa87e4f");
II ($D, $A, $B, $C, $words[15 + ($i * 16)], 10, "fe2ce6e0");
II ($C, $D, $A, $B, $words[6 + ($i * 16)], 15, "a3014314");
II ($B, $C, $D, $A, $words[13 + ($i * 16)], 21, "4e0811a1");
II ($A, $B, $C, $D, $words[4 + ($i * 16)], 6, "f7537e82");
II ($D, $A, $B, $C, $words[11 + ($i * 16)], 10, "bd3af235");
II ($C, $D, $A, $B, $words[2 + ($i * 16)], 15, "2ad7d2bb");
II ($B, $C, $D, $A, $words[9 + ($i * 16)], 21, "eb86d391");
$A=AddUnsigned(hexdec2($A),hexdec2($a));
$B=AddUnsigned(hexdec2($B),hexdec2($b));
$C=AddUnsigned(hexdec2($C),hexdec2($c));
$D=AddUnsigned(hexdec2($D),hexdec2($d));
}
$MD5 = WordToHex($A).WordToHex($B).WordToHex($C).WordToHex($D);
return $MD5;
}
function WordToHex($lValue) {
$WordToHexValue = "";
for ($lCount = 0;$lCount<=3;$lCount++) {
$lByte = (hexdec2($lValue)>>($lCount*8)) & 255;
$C = dechex($lByte);
$WordToHexValue .= (strlen($C)=='1')?"0".dechex($lByte):dechex($lByte);
}
return $WordToHexValue;
}
function F($X, $Y, $Z){
$X = hexdec2($X);
$Y = hexdec2($Y);
$Z = hexdec2($Z);
$calc = (($X & $Y) | ((~ $X) & $Z)); // X AND Y OR NOT X AND Z
return $calc;
}
function G($X, $Y, $Z){
$X = hexdec2($X);
$Y = hexdec2($Y);
$Z = hexdec2($Z);
$calc = (($X & $Z) | ($Y & (~ $Z))); // X AND Z OR Y AND NOT Z
return $calc;
}
function H($X, $Y, $Z){
$X = hexdec2($X);
$Y = hexdec2($Y);
$Z = hexdec2($Z);
$calc = ($X ^ $Y ^ $Z); // X XOR Y XOR Z
return $calc;
}
function I($X, $Y, $Z){
$X = hexdec2($X);
$Y = hexdec2($Y);
$Z = hexdec2($Z);
$calc = ($Y ^ ($X | (~ $Z))) ; // Y XOR (X OR NOT Z)
return $calc;
}
function AddUnsigned($lX,$lY) {
$lX8 = ($lX & 0x80000000);
$lY8 = ($lY & 0x80000000);
$lX4 = ($lX & 0x40000000);
$lY4 = ($lY & 0x40000000);
$lResult = ($lX & 0x3FFFFFFF)+($lY & 0x3FFFFFFF);
if ($lX4 & $lY4) {
$res = ($lResult ^ 0x80000000 ^ $lX8 ^ $lY8);
if($res < 0)
return '-'.dechex(abs($res));
else
return dechex($res);
}
if ($lX4 | $lY4) {
if ($lResult & 0x40000000) {
$res = ($lResult ^ 0xC0000000 ^ $lX8 ^ $lY8);
if($res < 0)
return '-'.dechex(abs($res));
else
return dechex($res);
} else {
$res = ($lResult ^ 0x40000000 ^ $lX8 ^ $lY8);
if($res < 0)
return '-'.dechex(abs($res));
else
return dechex($res);
}
} else {
$res = ($lResult ^ $lX8 ^ $lY8);
if($res < 0)
return '-'.dechex(abs($res));
else
return dechex($res);
}
}
function hexdec2($hex , $debug = false)
{
if(substr($hex, 0,1) == "-")
{
return doubleval('-'.hexdec("0x". str_replace("-", "", $hex )));
}
return hexdec("0x".$hex);
}
function FF(&$A, $B, $C, $D, $M, $s, $t){
$Level1 = hexdec2(AddUnsigned( F($B, $C, $D) , bindec($M) ));
$level2 = hexdec2(AddUnsigned($Level1, hexdec2($t)));
$A = hexdec2(AddUnsigned(hexdec2($A),$level2));
$A = rotate($A, $s);
$A = AddUnsigned($A , hexdec2($B)) ;
}
function GG(&$A, $B, $C, $D, $M, $s, $t){
$Level1 = hexdec2(AddUnsigned( G($B, $C, $D) , bindec($M) ));
$level2 = hexdec2(AddUnsigned($Level1, hexdec2($t)));
$A = hexdec2(AddUnsigned(hexdec2($A),$level2));
$A = rotate($A, $s);
$A = AddUnsigned($A , hexdec2($B)) ;
}
function HH(&$A, $B, $C, $D, $M, $s, $t){
$Level1 = hexdec2(AddUnsigned( H($B, $C, $D) , bindec($M) ));
$level2 = hexdec2(AddUnsigned($Level1, hexdec2($t)));
$A = hexdec2(AddUnsigned(hexdec2($A),$level2));
$A = rotate($A, $s);
$A = AddUnsigned($A , hexdec2($B)) ;
}
function II(&$A, $B, $C, $D, $M, $s, $t){
$Level1 = hexdec2(AddUnsigned( I($B, $C, $D) , bindec($M) ));
$level2 = hexdec2(AddUnsigned($Level1, hexdec2($t)));
$A = hexdec2(AddUnsigned(hexdec2($A),$level2));
$A = rotate($A, $s);
$A = AddUnsigned($A , hexdec2($B)) ;
}
function rotate ($decimal, $bits , $debug = false) {
return (($decimal << $bits) | shiftright($decimal, (32 - $bits)) & 0xffffffff);
}
function shiftright($decimal , $right)
{
if($decimal < 0)
{
$res = decbin($decimal >> $right);
for ($i=0; $i < $right; $i++) {
$res[$i] = "";
}
return bindec($res) ;
} else
{
return ($decimal >> $right);
}
}
function ConvertToArray($string) {
$lWordCount;
$lMessageLength = strlen($string);
$lNumberOfWords_temp1=$lMessageLength + 8;
$lNumberOfWords_temp2=($lNumberOfWords_temp1-($lNumberOfWords_temp1 % 64))/64;
$lNumberOfWords = ($lNumberOfWords_temp2+1)*16;
$lWordArray=Array("");
$lBytePosition = 0;
$lByteCount = 0;
while ( $lByteCount < $lMessageLength ) {
$lWordCount = ($lByteCount-($lByteCount % 4))/4;
$lBytePosition = ($lByteCount % 4)*8;
if(!isset($lWordArray[$lWordCount]))
$lWordArray[$lWordCount] = 0;
$lWordArray[$lWordCount] = ($lWordArray[$lWordCount] | (ord($string[$lByteCount])<<$lBytePosition));
$lByteCount++;
}
$lWordCount = ($lByteCount-($lByteCount % 4))/4;
$lBytePosition = ($lByteCount % 4)*8;
if(!isset($lWordArray[$lWordCount]))
$lWordArray[$lWordCount] = 0;
$lWordArray[$lWordCount] = $lWordArray[$lWordCount] | (0x80<<$lBytePosition);
$lWordArray[$lNumberOfWords-2] = $lMessageLength<<3;
$lWordArray[$lNumberOfWords-1] = $lMessageLength>>29;
for ($i=0; $i < $lNumberOfWords; $i++) {
if(isset($lWordArray[$i]))
$lWordArray[$i] = decbin($lWordArray[$i]);
else
$lWordArray[$i] = '0';
}
return $lWordArray;
};
$str='decker.su';
echo md5($str);
echo"\r\n";
echo MD($str);
?>
function MD($string){
$a = "67452301";
$b = "efcdab89";
$c = "98badcfe";
$d = "10325476";
$A = $a ;
$B = $b ;
$C = $c ;
$D = $d ;
$words = ConvertToArray($string);
for($i = 0; $i <= count($words)/16-1; $i++){
$a = $A;
$b = $B;
$c = $C;
$d = $D;
/* ROUND 1 */
FF ($A, $B, $C, $D, $words[0 + ($i * 16)], 7, "d76aa478");
FF ($D, $A, $B, $C, $words[1 + ($i * 16)], 12, "e8c7b756");
FF ($C, $D, $A, $B, $words[2 + ($i * 16)], 17, "242070db");
FF ($B, $C, $D, $A, $words[3 + ($i * 16)], 22, "c1bdceee");
FF ($A, $B, $C, $D, $words[4 + ($i * 16)], 7, "f57c0faf");
FF ($D, $A, $B, $C, $words[5 + ($i * 16)], 12, "4787c62a");
FF ($C, $D, $A, $B, $words[6 + ($i * 16)], 17, "a8304613");
FF ($B, $C, $D, $A, $words[7 + ($i * 16)], 22, "fd469501");
FF ($A, $B, $C, $D, $words[8 + ($i * 16)], 7, "698098d8");
FF ($D, $A, $B, $C, $words[9 + ($i * 16)], 12, "8b44f7af");
FF ($C, $D, $A, $B, $words[10 + ($i * 16)], 17, "ffff5bb1");
FF ($B, $C, $D, $A, $words[11 + ($i * 16)], 22, "895cd7be");
FF ($A, $B, $C, $D, $words[12 + ($i * 16)], 7, "6b901122");
FF ($D, $A, $B, $C, $words[13 + ($i * 16)], 12, "fd987193");
FF ($C, $D, $A, $B, $words[14 + ($i * 16)], 17, "a679438e");
FF ($B, $C, $D, $A, $words[15 + ($i * 16)], 22, "49b40821");
/* ROUND 2 */
GG ($A, $B, $C, $D, $words[1 + ($i * 16)], 5, "f61e2562");
GG ($D, $A, $B, $C, $words[6 + ($i * 16)], 9, "c040b340");
GG ($C, $D, $A, $B, $words[11 + ($i * 16)], 14, "265e5a51");
GG ($B, $C, $D, $A, $words[0 + ($i * 16)], 20, "e9b6c7aa");
GG ($A, $B, $C, $D, $words[5 + ($i * 16)], 5, "d62f105d");
GG ($D, $A, $B, $C, $words[10 + ($i * 16)], 9, "2441453");
GG ($C, $D, $A, $B, $words[15 + ($i * 16)], 14, "d8a1e681");
GG ($B, $C, $D, $A, $words[4 + ($i * 16)], 20, "e7d3fbc8");
GG ($A, $B, $C, $D, $words[9 + ($i * 16)], 5, "21e1cde6");
GG ($D, $A, $B, $C, $words[14 + ($i * 16)], 9, "c33707d6");
GG ($C, $D, $A, $B, $words[3 + ($i * 16)], 14, "f4d50d87");
GG ($B, $C, $D, $A, $words[8 + ($i * 16)], 20, "455a14ed");
GG ($A, $B, $C, $D, $words[13 + ($i * 16)], 5, "a9e3e905");
GG ($D, $A, $B, $C, $words[2 + ($i * 16)], 9, "fcefa3f8");
GG ($C, $D, $A, $B, $words[7 + ($i * 16)], 14, "676f02d9");
GG ($B, $C, $D, $A, $words[12 + ($i * 16)], 20, "8d2a4c8a");
/* ROUND 3 */
HH ($A, $B, $C, $D, $words[5 + ($i * 16)], 4, "fffa3942");
HH ($D, $A, $B, $C, $words[8 + ($i * 16)], 11, "8771f681");
HH ($C, $D, $A, $B, $words[11 + ($i * 16)], 16, "6d9d6122");
HH ($B, $C, $D, $A, $words[14 + ($i * 16)], 23, "fde5380c");
HH ($A, $B, $C, $D, $words[1 + ($i * 16)], 4, "a4beea44");
HH ($D, $A, $B, $C, $words[4 + ($i * 16)], 11, "4bdecfa9");
HH ($C, $D, $A, $B, $words[7 + ($i * 16)], 16, "f6bb4b60");
HH ($B, $C, $D, $A, $words[10 + ($i * 16)], 23, "bebfbc70");
HH ($A, $B, $C, $D, $words[13 + ($i * 16)], 4, "289b7ec6");
HH ($D, $A, $B, $C, $words[0 + ($i * 16)], 11, "eaa127fa");
HH ($C, $D, $A, $B, $words[3 + ($i * 16)], 16, "d4ef3085");
HH ($B, $C, $D, $A, $words[6 + ($i * 16)], 23, "4881d05");
HH ($A, $B, $C, $D, $words[9 + ($i * 16)], 4, "d9d4d039");
HH ($D, $A, $B, $C, $words[12 + ($i * 16)], 11, "e6db99e5");
HH ($C, $D, $A, $B, $words[15 + ($i * 16)], 16, "1fa27cf8");
HH ($B, $C, $D, $A, $words[2 + ($i * 16)], 23, "c4ac5665");
/* ROUND 4 */
II ($A, $B, $C, $D, $words[0 + ($i * 16)], 6, "f4292244");
II ($D, $A, $B, $C, $words[7 + ($i * 16)], 10, "432aff97");
II ($C, $D, $A, $B, $words[14 + ($i * 16)], 15, "ab9423a7");
II ($B, $C, $D, $A, $words[5 + ($i * 16)], 21, "fc93a039");
II ($A, $B, $C, $D, $words[12 + ($i * 16)], 6, "655b59c3");
II ($D, $A, $B, $C, $words[3 + ($i * 16)], 10, "8f0ccc92");
II ($C, $D, $A, $B, $words[10 + ($i * 16)], 15, "ffeff47d");
II ($B, $C, $D, $A, $words[1 + ($i * 16)], 21, "85845dd1");
II ($A, $B, $C, $D, $words[8 + ($i * 16)], 6, "6fa87e4f");
II ($D, $A, $B, $C, $words[15 + ($i * 16)], 10, "fe2ce6e0");
II ($C, $D, $A, $B, $words[6 + ($i * 16)], 15, "a3014314");
II ($B, $C, $D, $A, $words[13 + ($i * 16)], 21, "4e0811a1");
II ($A, $B, $C, $D, $words[4 + ($i * 16)], 6, "f7537e82");
II ($D, $A, $B, $C, $words[11 + ($i * 16)], 10, "bd3af235");
II ($C, $D, $A, $B, $words[2 + ($i * 16)], 15, "2ad7d2bb");
II ($B, $C, $D, $A, $words[9 + ($i * 16)], 21, "eb86d391");
$A=AddUnsigned(hexdec2($A),hexdec2($a));
$B=AddUnsigned(hexdec2($B),hexdec2($b));
$C=AddUnsigned(hexdec2($C),hexdec2($c));
$D=AddUnsigned(hexdec2($D),hexdec2($d));
}
$MD5 = WordToHex($A).WordToHex($B).WordToHex($C).WordToHex($D);
return $MD5;
}
function WordToHex($lValue) {
$WordToHexValue = "";
for ($lCount = 0;$lCount<=3;$lCount++) {
$lByte = (hexdec2($lValue)>>($lCount*8)) & 255;
$C = dechex($lByte);
$WordToHexValue .= (strlen($C)=='1')?"0".dechex($lByte):dechex($lByte);
}
return $WordToHexValue;
}
function F($X, $Y, $Z){
$X = hexdec2($X);
$Y = hexdec2($Y);
$Z = hexdec2($Z);
$calc = (($X & $Y) | ((~ $X) & $Z)); // X AND Y OR NOT X AND Z
return $calc;
}
function G($X, $Y, $Z){
$X = hexdec2($X);
$Y = hexdec2($Y);
$Z = hexdec2($Z);
$calc = (($X & $Z) | ($Y & (~ $Z))); // X AND Z OR Y AND NOT Z
return $calc;
}
function H($X, $Y, $Z){
$X = hexdec2($X);
$Y = hexdec2($Y);
$Z = hexdec2($Z);
$calc = ($X ^ $Y ^ $Z); // X XOR Y XOR Z
return $calc;
}
function I($X, $Y, $Z){
$X = hexdec2($X);
$Y = hexdec2($Y);
$Z = hexdec2($Z);
$calc = ($Y ^ ($X | (~ $Z))) ; // Y XOR (X OR NOT Z)
return $calc;
}
function AddUnsigned($lX,$lY) {
$lX8 = ($lX & 0x80000000);
$lY8 = ($lY & 0x80000000);
$lX4 = ($lX & 0x40000000);
$lY4 = ($lY & 0x40000000);
$lResult = ($lX & 0x3FFFFFFF)+($lY & 0x3FFFFFFF);
if ($lX4 & $lY4) {
$res = ($lResult ^ 0x80000000 ^ $lX8 ^ $lY8);
if($res < 0)
return '-'.dechex(abs($res));
else
return dechex($res);
}
if ($lX4 | $lY4) {
if ($lResult & 0x40000000) {
$res = ($lResult ^ 0xC0000000 ^ $lX8 ^ $lY8);
if($res < 0)
return '-'.dechex(abs($res));
else
return dechex($res);
} else {
$res = ($lResult ^ 0x40000000 ^ $lX8 ^ $lY8);
if($res < 0)
return '-'.dechex(abs($res));
else
return dechex($res);
}
} else {
$res = ($lResult ^ $lX8 ^ $lY8);
if($res < 0)
return '-'.dechex(abs($res));
else
return dechex($res);
}
}
function hexdec2($hex , $debug = false)
{
if(substr($hex, 0,1) == "-")
{
return doubleval('-'.hexdec("0x". str_replace("-", "", $hex )));
}
return hexdec("0x".$hex);
}
function FF(&$A, $B, $C, $D, $M, $s, $t){
$Level1 = hexdec2(AddUnsigned( F($B, $C, $D) , bindec($M) ));
$level2 = hexdec2(AddUnsigned($Level1, hexdec2($t)));
$A = hexdec2(AddUnsigned(hexdec2($A),$level2));
$A = rotate($A, $s);
$A = AddUnsigned($A , hexdec2($B)) ;
}
function GG(&$A, $B, $C, $D, $M, $s, $t){
$Level1 = hexdec2(AddUnsigned( G($B, $C, $D) , bindec($M) ));
$level2 = hexdec2(AddUnsigned($Level1, hexdec2($t)));
$A = hexdec2(AddUnsigned(hexdec2($A),$level2));
$A = rotate($A, $s);
$A = AddUnsigned($A , hexdec2($B)) ;
}
function HH(&$A, $B, $C, $D, $M, $s, $t){
$Level1 = hexdec2(AddUnsigned( H($B, $C, $D) , bindec($M) ));
$level2 = hexdec2(AddUnsigned($Level1, hexdec2($t)));
$A = hexdec2(AddUnsigned(hexdec2($A),$level2));
$A = rotate($A, $s);
$A = AddUnsigned($A , hexdec2($B)) ;
}
function II(&$A, $B, $C, $D, $M, $s, $t){
$Level1 = hexdec2(AddUnsigned( I($B, $C, $D) , bindec($M) ));
$level2 = hexdec2(AddUnsigned($Level1, hexdec2($t)));
$A = hexdec2(AddUnsigned(hexdec2($A),$level2));
$A = rotate($A, $s);
$A = AddUnsigned($A , hexdec2($B)) ;
}
function rotate ($decimal, $bits , $debug = false) {
return (($decimal << $bits) | shiftright($decimal, (32 - $bits)) & 0xffffffff);
}
function shiftright($decimal , $right)
{
if($decimal < 0)
{
$res = decbin($decimal >> $right);
for ($i=0; $i < $right; $i++) {
$res[$i] = "";
}
return bindec($res) ;
} else
{
return ($decimal >> $right);
}
}
function ConvertToArray($string) {
$lWordCount;
$lMessageLength = strlen($string);
$lNumberOfWords_temp1=$lMessageLength + 8;
$lNumberOfWords_temp2=($lNumberOfWords_temp1-($lNumberOfWords_temp1 % 64))/64;
$lNumberOfWords = ($lNumberOfWords_temp2+1)*16;
$lWordArray=Array("");
$lBytePosition = 0;
$lByteCount = 0;
while ( $lByteCount < $lMessageLength ) {
$lWordCount = ($lByteCount-($lByteCount % 4))/4;
$lBytePosition = ($lByteCount % 4)*8;
if(!isset($lWordArray[$lWordCount]))
$lWordArray[$lWordCount] = 0;
$lWordArray[$lWordCount] = ($lWordArray[$lWordCount] | (ord($string[$lByteCount])<<$lBytePosition));
$lByteCount++;
}
$lWordCount = ($lByteCount-($lByteCount % 4))/4;
$lBytePosition = ($lByteCount % 4)*8;
if(!isset($lWordArray[$lWordCount]))
$lWordArray[$lWordCount] = 0;
$lWordArray[$lWordCount] = $lWordArray[$lWordCount] | (0x80<<$lBytePosition);
$lWordArray[$lNumberOfWords-2] = $lMessageLength<<3;
$lWordArray[$lNumberOfWords-1] = $lMessageLength>>29;
for ($i=0; $i < $lNumberOfWords; $i++) {
if(isset($lWordArray[$i]))
$lWordArray[$i] = decbin($lWordArray[$i]);
else
$lWordArray[$i] = '0';
}
return $lWordArray;
};
$str='decker.su';
echo md5($str);
echo"\r\n";
echo MD($str);
?>
Результатом выполнения данного кода будет:
5cbcef02af47abc758c4d88ea5316f52
5cbcef02af47abc758c4d88ea5316f52
Т.о. мы видим, что написанная нами функция MD считает MD5 хеш точно также, как и встроенная md5(). Ч.т.д.
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