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Rijndael, AES: adjustments to what key sizes are and aren't allowed

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This commit is contained in:
terrafrost 2014-08-13 09:56:49 -05:00
parent cb8f991752
commit 35fd2888ea
2 changed files with 58 additions and 0 deletions
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52
phpseclib/Crypt/AES.php
View File

@ -152,4 +152,56 @@ class Crypt_AES extends Crypt_Rijndael
{ {
return; return;
} }
/**
* Sets the key length
*
* Valid key lengths are 128, 192, and 256. If the length is less than 128, it will be rounded up to
* 128. If the length is greater than 128 and invalid, it will be rounded down to the closest valid amount.
*
* @see Crypt_Rijndael:setKeyLength()
* @access public
* @param Integer $length
*/
function setKeyLength($length)
{
switch ($length) {
case 160:
$length = 192;
break;
case 224:
$length = 256;
}
parent::setKeyLength($length);
}
/**
* Sets the key.
*
* Rijndael supports 5x different key lengths, AES only supports 3x different key lengths.
*
* @see Crypt_Rijndael:setKey()
* @see setKeyLength()
* @access public
* @param String $key
*/
function setKey($key)
{
parent::setKey($key);
if (!$this->explicit_key_length) {
$length = strlen($key);
switch (true) {
case $length <= 16:
$this->key_size = 16;
break;
case $length <= 24:
$this->key_size = 24;
break;
default:
$this->key_size = 32;
}
$this->_setupEngine();
}
}
} }

6
phpseclib/Crypt/Rijndael.php
View File

@ -702,9 +702,15 @@ class Crypt_Rijndael extends Crypt_Base
case $length <= 16: case $length <= 16:
$this->key_size = 16; $this->key_size = 16;
break; break;
case $length <= 20:
$this->key_size = 20;
break;
case $length <= 24: case $length <= 24:
$this->key_size = 24; $this->key_size = 24;
break; break;
case $length <= 28:
$this->key_size = 28;
break;
default: default:
$this->key_size = 32; $this->key_size = 32;
} }