PHPExcel_Reader_Excel5_RC4 Class Reference

Collaboration diagram for PHPExcel_Reader_Excel5_RC4:

Public Member Functions
	__construct ($key)
	RC4 stream decryption/encryption constrcutor. More...
	RC4 ($data)
	Symmetric decryption/encryption function. More...

Data Fields
	$s = array()
	$i = 0
	$j = 0

Detailed Description

Definition at line 35 of file RC4.php.

Constructor & Destructor Documentation

__construct()

PHPExcel_Reader_Excel5_RC4::__construct

(

$key

)

RC4 stream decryption/encryption constrcutor.

Parameters

string

$key

Encryption key/passphrase

Definition at line 47 of file RC4.php.

References $i, $j, $key, $t, and s.

        {
                $len = strlen($key);

                for ($this->i = 0; $this->i < 256; $this->i++) {
                        $this->s[$this->i] = $this->i;
                }

                $this->j = 0;
                for ($this->i = 0; $this->i < 256; $this->i++) {
                        $this->j = ($this->j + $this->s[$this->i] + ord($key[$this->i % $len])) % 256;
                        $t = $this->s[$this->i];
                        $this->s[$this->i] = $this->s[$this->j];
                        $this->s[$this->j] = $t;
                }
                $this->i = $this->j = 0;
        }

Member Function Documentation

RC4()

PHPExcel_Reader_Excel5_RC4::RC4

(

$data

)

Symmetric decryption/encryption function.

Parameters

string

$data

Data to encrypt/decrypt

Returns

string

Definition at line 72 of file RC4.php.

References $data, $i, $j, $t, and s.

        {
                $len = strlen($data);
                for ($c = 0; $c < $len; $c++) {
                        $this->i = ($this->i + 1) % 256;
                        $this->j = ($this->j + $this->s[$this->i]) % 256;
                        $t = $this->s[$this->i];
                        $this->s[$this->i] = $this->s[$this->j];
                        $this->s[$this->j] = $t;

                        $t = ($this->s[$this->i] + $this->s[$this->j]) % 256;

                        $data[$c] = chr(ord($data[$c]) ^ $this->s[$t]);
                }
                return $data;
        }

Field Documentation

$i

PHPExcel_Reader_Excel5_RC4::$i = 0

Definition at line 39 of file RC4.php.

Referenced by __construct(), and RC4().

$j

PHPExcel_Reader_Excel5_RC4::$j = 0

Definition at line 40 of file RC4.php.

Referenced by __construct(), and RC4().

$s

PHPExcel_Reader_Excel5_RC4::$s = array()

Definition at line 38 of file RC4.php.

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The documentation for this class was generated from the following file:

• libs/composer/vendor/phpoffice/phpexcel/Classes/PHPExcel/Reader/Excel5/RC4.php