143 lines
2.8 KiB
Plaintext
143 lines
2.8 KiB
Plaintext
protected $cipherType = MCRYPT_RIJNDAEL_128;
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protected $cipherMode = MCRYPT_MODE_CBC;
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public function setEncryptionMode($mode = 'cbc', $strength = 128)
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{
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switch ((int) $strength)
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{
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default:
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case '128':
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$this->cipherType = MCRYPT_RIJNDAEL_128;
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break;
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case '192':
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$this->cipherType = MCRYPT_RIJNDAEL_192;
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break;
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case '256':
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$this->cipherType = MCRYPT_RIJNDAEL_256;
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break;
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}
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switch (strtolower($mode))
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{
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case 'ecb':
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$this->cipherMode = MCRYPT_MODE_ECB;
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break;
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default:
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case 'cbc':
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$this->cipherMode = MCRYPT_MODE_CBC;
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break;
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}
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}
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public function encrypt($plainText, $key, $iv = null)
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{
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$iv_size = $this->getBlockSize();
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$key = $this->resizeKey($key, $iv_size);
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$iv = $this->resizeKey($iv, $iv_size);
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if (empty($iv))
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{
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$randVal = new Randval();
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$iv = $randVal->generate($iv_size);
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}
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$cipherText = mcrypt_encrypt($this->cipherType, $key, $plainText, $this->cipherMode, $iv);
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$cipherText = $iv . $cipherText;
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return $cipherText;
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}
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public function decrypt($cipherText, $key)
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{
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$iv_size = $this->getBlockSize();
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$key = $this->resizeKey($key, $iv_size);
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$iv = substr($cipherText, 0, $iv_size);
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$cipherText = substr($cipherText, $iv_size);
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$plainText = mcrypt_decrypt($this->cipherType, $key, $cipherText, $this->cipherMode, $iv);
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return $plainText;
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}
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public function isSupported(Phpfunc $phpfunc = null)
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{
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if (!is_object($phpfunc) || !($phpfunc instanceof $phpfunc))
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{
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$phpfunc = new Phpfunc();
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}
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if (!$phpfunc->function_exists('mcrypt_get_key_size'))
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{
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return false;
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}
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if (!$phpfunc->function_exists('mcrypt_get_iv_size'))
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{
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return false;
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}
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if (!$phpfunc->function_exists('mcrypt_create_iv'))
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{
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return false;
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}
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if (!$phpfunc->function_exists('mcrypt_encrypt'))
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{
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return false;
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}
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if (!$phpfunc->function_exists('mcrypt_decrypt'))
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{
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return false;
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}
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if (!$phpfunc->function_exists('mcrypt_list_algorithms'))
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{
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return false;
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}
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if (!$phpfunc->function_exists('hash'))
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{
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return false;
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}
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if (!$phpfunc->function_exists('hash_algos'))
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{
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return false;
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}
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$algorightms = $phpfunc->mcrypt_list_algorithms();
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if (!in_array('rijndael-128', $algorightms))
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{
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return false;
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}
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if (!in_array('rijndael-192', $algorightms))
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{
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return false;
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}
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if (!in_array('rijndael-256', $algorightms))
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{
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return false;
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}
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$algorightms = $phpfunc->hash_algos();
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if (!in_array('sha256', $algorightms))
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{
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return false;
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}
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return true;
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}
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public function getBlockSize()
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{
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return mcrypt_get_iv_size($this->cipherType, $this->cipherMode);
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} |