Security
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<?php
/*
* sha-1.php
* A PHP implementation of the Secure Hash Algorithm, SHA-1, based on
* the JavaScript implementation by Paul Johnston.
* This is basically a "translation from JavaScript to PHP, so most
* of the credits should go to Paul Johnston. I only re-wrote it in PHP.
* See http://pajhome.org.uk/site/legal.html for details.
*/
/*
* Convert a 32-bit number to a hex string with ms-byte first
*/
function hex($num)
{
$hex_chr = "0123456789abcdef";
$str = "";
for($j = 7; $j >= 0; $j--)
$str .= $hex_chr{(($num >> ($j * 4)) & 0x0F)};
return $str;
}
/*
* Convert a string to a sequence of 16-word blocks, stored as an array.
* Append padding bits and the length, as described in the SHA1 standard.
*/
function str2blks_SHA1($str)
{
$nblk = ((strlen($str) + 8) >> 6) + 1;
for($i = 0; $i < $nblk * 16; $i++) $blks[$i] = 0;
for($i = 0; $i < strlen($str); $i++)
$blks[$i >> 2] |= ord($str{$i}) << (24 - ($i % 4) * 8);
$blks[$i >> 2] |= 0x80 << (24 - ($i % 4) * 8);
$blks[$nblk * 16 - 1] = strlen($str) * 8;
return $blks;
}
/*
* Bitwise rotate a 32-bit number to the left
*/
// zeroFill() is needed because PHP doesn't have a zero-fill
// right shift operator like JavaScript's >>>
function zeroFill($a, $b)
{
$z = hexdec(80000000);
if ($z & $a)
{
$a >>= 1;
$a &= (~$z);
$a |= 0x40000000;
$a >>= ($b-1);
}
else
{
$a >>= $b;
}
return $a;
}
function rol($num, $cnt)
{
return ($num << $cnt) | (zeroFill($num, (32 - $cnt)));
}
/*
* Perform the appropriate triplet combination function for the current
* iteration
*/
function ft($t, $b, $c, $d)
{
if($t < 20) return ($b & $c) | ((~$b) & $d);
if($t < 40) return $b ^ $c ^ $d;
if($t < 60) return ($b & $c) | ($b & $d) | ($c & $d);
return $b ^ $c ^ $d;
}
/*
* Determine the appropriate additive constant for the current iteration
*/
function kt($t)
{
return ($t < 20) ? 1518500249 : ( ($t < 40) ? 1859775393 : ( ($t < 60) ? -1894007588 : -899497514 ) );
}
/*
* Take a string and return the hex representation of its SHA-1.
*/
function calcSHA1($str)
{
$x = str2blks_SHA1($str);
$a = 1732584193;
$b = -271733879;
$c = -1732584194;
$d = 271733878;
$e = -1009589776;
for($i = 0; $i < count($x); $i += 16)
{
$olda = $a;
$oldb = $b;
$oldc = $c;
$oldd = $d;
$olde = $e;
for($j = 0; $j < 80; $j++)
{
if($j < 16) $w[$j] = $x[$i + $j];
else $w[$j] = rol($w[$j-3] ^ $w[$j-8] ^ $w[$j-14] ^ $w[$j-16], 1);
$t = rol($a, 5) + ft($j, $b, $c, $d) + $e + $w[$j] + kt($j);
$e = $d;
$d = $c;
$c = rol($b, 30);
$b = $a;
$a = $t;
}
$a += $olda;
$b += $oldb;
$c += $oldc;
$d += $oldd;
$e += $olde;
}
return hex($a) . hex($b) . hex($c) . hex($d) . hex($e);
}
?>
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Usage Example
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<?php
require("sha-1.php");
$hash = calcSHA1("PHP rules");
echo $hash;
?>
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