function __construct($I, $P, $mul)
{
parent::__construct($I, $P);
$this->A = gmp_strval(gmp_mul($this->N, "{$mul}"), 16);
}
parent::__construct($I, $P);
$this->a = gmp_random();
$this->A = gmp_strval(gmp_powm($this->g, $this->a, $this->N), 16);
}
function setSalt($salt)
{
$this->salt = $salt;
$this->x = gmp_init(hash('sha256', $salt . $this->P), 16);
}
function getA()
{
return $this->A;
}
function setB($B)
{
$this->B = gmp_init($B, 16);
$this->u = gmp_init(hash('sha256', $this->A . $B), 16);
$this->S = gmp_powm(gmp_sub($this->B, gmp_mul($this->k, gmp_powm($this->g, $this->x, $this->N))), gmp_add($this->a, gmp_mul($this->u, $this->x)), $this->N);
}
}
// don't output if we're included into another script.
if (!debug_backtrace()) {
$I = 'email';
$P = 'password';
$S = new SRPServer($I, $P);
$C = new SRPClient($I, $P);
$C->setSalt($S->getSalt());
$S->setA($C->getA());
$C->setB($S->getB());
print $S->getProof() === $C->getProof() ? "OK\n\n" : "Not OK :(\n\n";
}