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Pure-PHP implementation of RC4. Uses mcrypt, if available, and an internal implementation, otherwise.
| Author: | Jim Wigginton |
| Copyright: | 2007 Jim Wigginton |
| License: | http://www.opensource.org/licenses/mit-license.html MIT License |
| Link: | http://phpseclib.sourceforge.net |
| File Size: | 348 lines (9 kb) |
| Included or required: | 0 times |
| Referenced: | 0 times |
| Includes or requires: | 0 files |
RC4:: (10 methods):
__construct()
isValidEngine()
setIV()
setKeyLength()
encrypt()
decrypt()
_encryptBlock()
_decryptBlock()
_setupKey()
_crypt()
| __construct() X-Ref |
| Default Constructor. Determines whether or not the mcrypt extension should be used. return: \phpseclib\Crypt\RC4 see: \phpseclib\Crypt\Base::__construct() |
| isValidEngine($engine) X-Ref |
| Test for engine validity This is mainly just a wrapper to set things up for \phpseclib\Crypt\Base::isValidEngine() return: bool param: int $engine see: \phpseclib\Crypt\Base::__construct() |
| setIV($iv) X-Ref |
| Dummy function. Some protocols, such as WEP, prepend an "initialization vector" to the key, effectively creating a new key [1]. If you need to use an initialization vector in this manner, feel free to prepend it to the key, yourself, before calling setKey(). [1] WEP's initialization vectors (IV's) are used in a somewhat insecure way. Since, in that protocol, the IV's are relatively easy to predict, an attack described by {@link http://www.drizzle.com/~aboba/IEEE/rc4_ksaproc.pdf Scott Fluhrer, Itsik Mantin, and Adi Shamir} can be used to quickly guess at the rest of the key. The following links elaborate: {@link http://www.rsa.com/rsalabs/node.asp?id=2009 http://www.rsa.com/rsalabs/node.asp?id=2009} {@link http://en.wikipedia.org/wiki/Related_key_attack http://en.wikipedia.org/wiki/Related_key_attack} param: string $iv see: self::setKey() |
| setKeyLength($length) X-Ref |
| Sets the key length Keys can be between 1 and 256 bytes long. param: int $length |
| encrypt($plaintext) X-Ref |
| Encrypts a message. return: string $ciphertext param: string $plaintext see: \phpseclib\Crypt\Base::decrypt() see: self::_crypt() |
| decrypt($ciphertext) X-Ref |
| Decrypts a message. $this->decrypt($this->encrypt($plaintext)) == $this->encrypt($this->encrypt($plaintext)). At least if the continuous buffer is disabled. return: string $plaintext param: string $ciphertext see: \phpseclib\Crypt\Base::encrypt() see: self::_crypt() |
| _encryptBlock($in) X-Ref |
| Encrypts a block param: string $in |
| _decryptBlock($in) X-Ref |
| Decrypts a block param: string $in |
| _setupKey() X-Ref |
| Setup the key (expansion) see: \phpseclib\Crypt\Base::_setupKey() |
| _crypt($text, $mode) X-Ref |
| Encrypts or decrypts a message. return: string $text param: string $text param: int $mode see: self::encrypt() see: self::decrypt() |