我发现使用AES 256 CBC和保留IV很难从mcrypt切换到openssl.我对密码学有点新意,所以我真的不知道所有内容,但我理解基础知识.

假设我有以下代码

function encrypt($masterPassword,$data) 
{
    $keySize = mcrypt_get_key_size(MCRYPT_RIJNDAEL_256,MCRYPT_MODE_CBC);
    $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256,MCRYPT_MODE_CBC);
    $iv = mcrypt_create_iv($ivSize,MCRYPT_DEV_URANDOM);
    $key = mb_substr(hash('SHA256',$masterPassword),$keySize);
    $encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_256,$key,$data,MCRYPT_MODE_CBC,$iv);
    return base64_encode($iv . $encrypted);
}

function decrypt($masterPassword,$base64) 
{
    $keySize = mcrypt_get_key_size(MCRYPT_RIJNDAEL_256,MCRYPT_MODE_CBC);
    $key = mb_substr(hash('SHA256',$keySize);
    $data = base64_decode($base64);
    $iv = substr($data,$ivSize);
    $encrypted = substr($data,$ivSize,strlen($data));
    $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_256,$encrypted,$iv);
    return trim($decrypted);
}

如何“转换”此代码以使用mcrypt的openssl？