Collaboration diagram for Auth_OpenID_DiffieHellman:

Public Member Functions
	Auth_OpenID_DiffieHellman ($mod=null, $gen=null, $private=null, $lib=null)
	getSharedSecret ($composite)
	getPublicKey ()
	usingDefaultValues ()
	xorSecret ($composite, $secret, $hash_func)

Data Fields
	$mod
	$gen
	$private
	$lib = null

Detailed Description

Definition at line 43 of file DiffieHellman.php.

Member Function Documentation

Auth_OpenID_DiffieHellman::Auth_OpenID_DiffieHellman	(	$mod = `null`,
		$gen = `null`,
		$private = `null`,
		$lib = `null`
	)

Definition at line 50 of file DiffieHellman.php.

References $gen, $lib, $mod, $private, Auth_OpenID_getDefaultGen(), Auth_OpenID_getDefaultMod(), and Auth_OpenID_getMathLib().

    {
        if ($lib === null) {
            $this->lib = Auth_OpenID_getMathLib();
        } else {
            $this->lib = $lib;
        }
        if ($mod === null) {
            $this->mod = $this->lib->init(Auth_OpenID_getDefaultMod());
        } else {
            $this->mod = $mod;
        }
        if ($gen === null) {
            $this->gen = $this->lib->init(Auth_OpenID_getDefaultGen());
        } else {
            $this->gen = $gen;
        }
        if ($private === null) {
            $r = $this->lib->rand($this->mod);
            $this->private = $this->lib->add($r, 1);
        } else {
            $this->private = $private;
        }
        $this->public = $this->lib->powmod($this->gen, $this->private,
                                           $this->mod);
    }

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Auth_OpenID_DiffieHellman::getPublicKey ( )

Definition at line 87 of file DiffieHellman.php.

    {
        return $this->public;
    }

Auth_OpenID_DiffieHellman::getSharedSecret ( $composite )

Definition at line 82 of file DiffieHellman.php.

Referenced by xorSecret().

    {
        return $this->lib->powmod($composite, $this->private, $this->mod);
    }

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Auth_OpenID_DiffieHellman::usingDefaultValues ( )

Definition at line 92 of file DiffieHellman.php.

References Auth_OpenID_getDefaultGen(), and Auth_OpenID_getDefaultMod().

    {
        return ($this->mod == Auth_OpenID_getDefaultMod() &&
                $this->gen == Auth_OpenID_getDefaultGen());
    }

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Auth_OpenID_DiffieHellman::xorSecret	(	$composite,
		$secret,
		$hash_func
	)

Definition at line 98 of file DiffieHellman.php.

References Auth_OpenID\bytes(), and getSharedSecret().

    {
        $dh_shared = $this->getSharedSecret($composite);
        $dh_shared_str = $this->lib->longToBinary($dh_shared);
        $hash_dh_shared = $hash_func($dh_shared_str);
        $xsecret = "";
        for ($i = 0; $i < Auth_OpenID::bytes($secret); $i++) {
            $xsecret .= chr(ord($secret[$i]) ^ ord($hash_dh_shared[$i]));
        }
        return $xsecret;
    }