php写的AES加密解密类分享

params['encryptKey'] : $key,mcrypt_enc_get_key_size($module)); /* Create the IV and determine the keysize length,use MCRYPT_RAND * on Windows instead */ $iv = substr(md5($key),mcrypt_enc_get_iv_size($module)); /* Intialize encryption */ mcrypt_generic_init($module,$key,$iv);

    /* Encrypt data */
    $encrypted = mcrypt_generic($module,$plaintext);

    /* Terminate encryption handler */
    mcrypt_generic_deinit($module);
    mcrypt_module_close($module);
    return base64_encode($encrypted);
}

/**
 * This was AES-128 / CBC / NoPadding decrypted.
 * @author Terry
 * @param string $encrypted     base64_encode encrypted string
 * @param string $key
 * @throws CException
 * @return string
 */
public static function AesDecrypt($encrypted,$key = null)
{
    if ($encrypted == '') return '';
    if(!extension_loaded('mcrypt'))
        throw new CException(Yii::t('yii','AesDecrypt requires PHP mcrypt extension to be loaded in order to use data encryption feature.'));

    $ciphertext_dec = base64_decode($encrypted);
    $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128,mcrypt_enc_get_key_size($module));

    $iv = substr(md5($key),mcrypt_enc_get_iv_size($module));

    /* Initialize encryption module for decryption */
    mcrypt_generic_init($module,$iv);

    /* Decrypt encrypted string */
    $decrypted = mdecrypt_generic($module,$ciphertext_dec);

    /* Terminate decryption handle and close module */
    mcrypt_generic_deinit($module);
    mcrypt_module_close($module);
    return rtrim($decrypted,"");
}

/**
 * Returns the length of the given string.
 * If available uses the multibyte string function mb_strlen.
 * @param string $string the string being measured for length
 * @return integer the length of the string
 */
private static function strlen($string)
{
    return extension_loaded('mbstring') ? mb_strlen($string,'8bit') : strlen($string);
}

/**
 * Returns the portion of string specified by the start and length parameters.
 * If available uses the multibyte string function mb_substr
 * @param string $string the input string. Must be one character or longer.
 * @param integer $start the starting position
 * @param integer $length the desired portion length
 * @return string the extracted part of string,or FALSE on failure or an empty string.
 */
private static function substr($string,$start,$length)
{
    return extension_loaded('mbstring') ? mb_substr($string,$length,'8bit') : substr($string,$length);
}

}

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