diff options
Diffstat (limited to 'system/libraries/Encryption.php')
| -rw-r--r-- | system/libraries/Encryption.php | 78 |
1 files changed, 63 insertions, 15 deletions
diff --git a/system/libraries/Encryption.php b/system/libraries/Encryption.php index b85d7da36..1a61967a7 100644 --- a/system/libraries/Encryption.php +++ b/system/libraries/Encryption.php @@ -123,6 +123,13 @@ class CI_Encryption { 'sha512' => 64 ); + /** + * mbstring.func_override flag + * + * @var bool + */ + protected static $func_override; + // -------------------------------------------------------------------- /** @@ -145,8 +152,10 @@ class CI_Encryption { return show_error('Encryption: Unable to find an available encryption driver.'); } + isset(self::$func_override) OR self::$func_override = (extension_loaded('mbstring') && ini_get('mbstring.func_override')); $this->initialize($params); - if ( ! isset($this->_key) && strlen($key = config_item('encryption_key')) > 0) + + if ( ! isset($this->_key) && self::strlen($key = config_item('encryption_key')) > 0) { $this->_key = $key; } @@ -337,7 +346,7 @@ class CI_Encryption { return FALSE; } - isset($params['key']) OR $params['key'] = $this->hkdf($this->_key, 'sha512', NULL, strlen($this->_key), 'encryption'); + isset($params['key']) OR $params['key'] = $this->hkdf($this->_key, 'sha512', NULL, self::strlen($this->_key), 'encryption'); if (($data = $this->{'_'.$this->_driver.'_encrypt'}($data, $params)) === FALSE) { @@ -392,7 +401,7 @@ class CI_Encryption { if (in_array(strtolower(mcrypt_enc_get_modes_name($params['handle'])), array('cbc', 'ecb'), TRUE)) { $block_size = mcrypt_enc_get_block_size($params['handle']); - $pad = $block_size - (strlen($data) % $block_size); + $pad = $block_size - (self::strlen($data) % $block_size); $data .= str_repeat(chr($pad), $pad); } @@ -480,13 +489,13 @@ class CI_Encryption { ? $this->_digests[$params['hmac_digest']] * 2 : $this->_digests[$params['hmac_digest']]; - if (strlen($data) <= $digest_size) + if (self::strlen($data) <= $digest_size) { return FALSE; } - $hmac_input = substr($data, 0, $digest_size); - $data = substr($data, $digest_size); + $hmac_input = self::substr($data, 0, $digest_size); + $data = self::substr($data, $digest_size); isset($params['hmac_key']) OR $params['hmac_key'] = $this->hkdf($this->_key, 'sha512', NULL, NULL, 'authentication'); $hmac_check = hash_hmac($params['hmac_digest'], $data, $params['hmac_key'], ! $params['base64']); @@ -509,7 +518,7 @@ class CI_Encryption { $data = base64_decode($data); } - isset($params['key']) OR $params['key'] = $this->hkdf($this->_key, 'sha512', NULL, strlen($this->_key), 'encryption'); + isset($params['key']) OR $params['key'] = $this->hkdf($this->_key, 'sha512', NULL, self::strlen($this->_key), 'encryption'); return $this->{'_'.$this->_driver.'_decrypt'}($data, $params); } @@ -536,8 +545,8 @@ class CI_Encryption { { if (mcrypt_enc_get_modes_name($params['handle']) !== 'ECB') { - $iv = substr($data, 0, $iv_size); - $data = substr($data, $iv_size); + $iv = self::substr($data, 0, $iv_size); + $data = self::substr($data, $iv_size); } else { @@ -564,7 +573,7 @@ class CI_Encryption { // Remove PKCS#7 padding, if necessary if (in_array(strtolower(mcrypt_enc_get_modes_name($params['handle'])), array('cbc', 'ecb'), TRUE)) { - $data = substr($data, 0, -ord($data[strlen($data)-1])); + $data = self::substr($data, 0, -ord($data[self::strlen($data)-1])); } mcrypt_generic_deinit($params['handle']); @@ -589,8 +598,8 @@ class CI_Encryption { { if ($iv_size = openssl_cipher_iv_length($params['handle'])) { - $iv = substr($data, 0, $iv_size); - $data = substr($data, $iv_size); + $iv = self::substr($data, 0, $iv_size); + $data = self::substr($data, $iv_size); } else { @@ -827,17 +836,17 @@ class CI_Encryption { return FALSE; } - strlen($salt) OR $salt = str_repeat("\0", $this->_digests[$digest]); + self::strlen($salt) OR $salt = str_repeat("\0", $this->_digests[$digest]); $prk = hash_hmac($digest, $key, $salt, TRUE); $key = ''; - for ($key_block = '', $block_index = 1; strlen($key) < $length; $block_index++) + for ($key_block = '', $block_index = 1; self::strlen($key) < $length; $block_index++) { $key_block = hash_hmac($digest, $key_block.$info.chr($block_index), $prk, TRUE); $key .= $key_block; } - return substr($key, 0, $length); + return self::substr($key, 0, $length); } // -------------------------------------------------------------------- @@ -863,6 +872,45 @@ class CI_Encryption { return NULL; } + // -------------------------------------------------------------------- + + /** + * Byte-safe strlen() + * + * @param string $str + * @return integer + */ + protected static function strlen($str) + { + return (self::$func_override) + ? mb_strlen($str, '8bit') + : strlen($str); + } + + // -------------------------------------------------------------------- + + /** + * Byte-safe substr() + * + * @param string $str + * @param int $start + * @param int $length + * @return string + */ + protected static function substr($str, $start, $length = NULL) + { + if (self::$func_override) + { + // mb_substr($str, $start, null, '8bit') returns an empty + // string on PHP 5.3 + isset($length) OR $length = ($start >= 0 ? self::strlen($str) - $start : -$start); + return mb_substr($str, $start, $length, '8bit'); + } + + return isset($length) + ? substr($str, $start, $length) + : substr($str, $start); + } } /* End of file Encryption.php */ |