/**
* Sets the key.
*
* Keys can be of any length. Twofish, itself, requires the use of a key that's 128, 192 or 256-bits long.
* If the key is less than 256-bits we round the length up to the closest valid key length,
* padding $key with null bytes. If the key is more than 256-bits, we trim the excess bits.
*
* If the key is not explicitly set, it'll be assumed a 128 bits key to be all null bytes.
*
* @access public
* @see \phpseclib\Crypt\Base::setKey()
* @param String $key
*/
function setKey($key)
{
$keylength = strlen($key);
switch (true) {
case $keylength <= 16:
$key = str_pad($key, 16, "");
break;
case $keylength <= 24:
$key = str_pad($key, 24, "");
break;
case $keylength < 32:
$key = str_pad($key, 32, "");
break;
case $keylength > 32:
$key = substr($key, 0, 32);
}
parent::setKey($key);
}
/**
* Sets the key.
*
* Keys can be of any length. RC2, itself, uses 1 to 1024 bit keys (eg.
* strlen($key) <= 128), however, we only use the first 128 bytes if $key
* has more then 128 bytes in it, and set $key to a single null byte if
* it is empty.
*
* If the key is not explicitly set, it'll be assumed to be a single
* null byte.
*
* @see \phpseclib\Crypt\Base::setKey()
* @access public
* @param string $key
* @param int $t1 optional Effective key length in bits.
*/
function setKey($key, $t1 = 0)
{
$this->orig_key = $key;
if ($t1 <= 0) {
$t1 = $this->default_key_length;
} elseif ($t1 > 1024) {
$t1 = 1024;
}
$this->current_key_length = $t1;
// Key byte count should be 1..128.
$key = strlen($key) ? substr($key, 0, 128) : "";
$t = strlen($key);
// The mcrypt RC2 implementation only supports effective key length
// of 1024 bits. It is however possible to handle effective key
// lengths in range 1..1024 by expanding the key and applying
// inverse pitable mapping to the first byte before submitting it
// to mcrypt.
// Key expansion.
$l = array_values(unpack('C*', $key));
$t8 = $t1 + 7 >> 3;
$tm = 0xff >> 8 * $t8 - $t1;
// Expand key.
$pitable = $this->pitable;
for ($i = $t; $i < 128; $i++) {
$l[$i] = $pitable[$l[$i - 1] + $l[$i - $t]];
}
$i = 128 - $t8;
$l[$i] = $pitable[$l[$i] & $tm];
while ($i--) {
$l[$i] = $pitable[$l[$i + 1] ^ $l[$i + $t8]];
}
// Prepare the key for mcrypt.
$l[0] = $this->invpitable[$l[0]];
array_unshift($l, 'C*');
parent::setKey(call_user_func_array('pack', $l));
}
/**
* Sets the key.
*
* Keys can be between 1 and 256 bytes long. If they are longer then 256 bytes, the first 256 bytes will
* be used. If no key is explicitly set, it'll be assumed to be a single null byte.
*
* @access public
* @see \phpseclib\Crypt\Base::setKey()
* @param String $key
*/
function setKey($key)
{
parent::setKey(substr($key, 0, 256));
}
/**
* Default Constructor.
*
* Determines whether or not the mcrypt extension should be used.
*
* $mode could be:
*
* - \phpseclib\Crypt\Base::MODE_ECB
*
* - \phpseclib\Crypt\Base::MODE_CBC
*
* - \phpseclib\Crypt\Base::MODE_CTR
*
* - \phpseclib\Crypt\Base::MODE_CFB
*
* - \phpseclib\Crypt\Base::MODE_OFB
*
* If not explictly set, \phpseclib\Crypt\Base::MODE_CBC will be used.
*
* @see \phpseclib\Crypt\Base::Crypt_Base()
* @param optional Integer $mode
* @access public
/**
* Sets the key.
*
* Keys can be of any length. Rijndael, itself, requires the use of a key that's between 128-bits and 256-bits long and
* whose length is a multiple of 32. If the key is less than 256-bits and the key length isn't set, we round the length
* up to the closest valid key length, padding $key with null bytes. If the key is more than 256-bits, we trim the
* excess bits.
*
* If the key is not explicitly set, it'll be assumed to be all null bytes.
*
* Note: 160/224-bit keys must explicitly set by setKeyLength(), otherwise they will be round/pad up to 192/256 bits.
*
* @see \phpseclib\Crypt\Base:setKey()
* @see setKeyLength()
* @access public
* @param String $key
*/
function setKey($key)
{
if (!$this->explicit_key_length) {
$length = strlen($key);
switch (true) {
case $length <= 16:
$this->key_size = 16;
break;
case $length <= 20:
$this->key_size = 20;
break;
case $length <= 24:
$this->key_size = 24;
break;
case $length <= 28:
$this->key_size = 28;
break;
default:
$this->key_size = 32;
}
}
parent::setKey($key);
}
/**
* Sets the key.
*
* Keys can be of any length. Blowfish, itself, requires the use of a key between 32 and max. 448-bits long.
* If the key is less than 32-bits we NOT fill the key to 32bit but let the key as it is to be compatible
* with mcrypt because mcrypt act this way with blowfish key's < 32 bits.
*
* If the key is more than 448-bits, we trim the excess bits.
*
* If the key is not explicitly set, or empty, it'll be assumed a 128 bits key to be all null bytes.
*
* @access public
* @see \phpseclib\Crypt\Base::setKey()
* @param String $key
*/
function setKey($key)
{
$keylength = strlen($key);
if (!$keylength) {
$key = "";
} elseif ($keylength > 56) {
$key = substr($key, 0, 56);
}
parent::setKey($key);
}
/**
* Sets the key.
*
* Keys can be of any length. DES, itself, uses 64-bit keys (eg. strlen($key) == 8), however, we
* only use the first eight, if $key has more then eight characters in it, and pad $key with the
* null byte if it is less then eight characters long.
*
* DES also requires that every eighth bit be a parity bit, however, we'll ignore that.
*
* If the key is not explicitly set, it'll be assumed to be all zero's.
*
* @see \phpseclib\Crypt\Base::setKey()
* @access public
* @param string $key
*/
function setKey($key)
{
// We check/cut here only up to max length of the key.
// Key padding to the proper length will be done in _setupKey()
if (strlen($key) > $this->key_size_max) {
$key = substr($key, 0, $this->key_size_max);
}
// Sets the key
parent::setKey($key);
}
