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QQ空间g_tk加密算法PHP版

1.[代码][PHP]代码

//G_tk计算

function getGTK($skey){

$hash = 5381;

for($i=0;$i

$hash += ($hash << 5) + utf8_unicode($skey[$i]);

}

return $hash & 0x7fffffff;

}

function utf8_unicode($c) {

switch(strlen($c)) {

case 1:

return ord($c);

case 2:

$n = (ord($c[0]) & 0x3f) << 6;

$n += ord($c[1]) & 0x3f;

return $n;

case 3:

$n = (ord($c[0]) & 0x1f) << 12;

$n += (ord($c[1]) & 0x3f) << 6;

$n += ord($c[2]) & 0x3f;

return $n;

case 4:

$n = (ord($c[0]) & 0x0f) << 18;

$n += (ord($c[1]) & 0x3f) << 12;

$n += (ord($c[2]) & 0x3f) << 6;

$n += ord($c[3]) & 0x3f;

return $n;

}

}