Net_SSH2::_encryption_algorithm_to_key_size PHP Method

    function _encryption_algorithm_to_key_size($algorithm)
    {
        switch ($algorithm) {
            case 'none':
                return 0;
            case 'aes128-cbc':
            case 'aes128-ctr':
            case 'arcfour':
            case 'arcfour128':
            case 'blowfish-cbc':
            case 'blowfish-ctr':
            case 'twofish128-cbc':
            case 'twofish128-ctr':
                return 16;
            case '3des-cbc':
            case '3des-ctr':
            case 'aes192-cbc':
            case 'aes192-ctr':
            case 'twofish192-cbc':
            case 'twofish192-ctr':
                return 24;
            case 'aes256-cbc':
            case 'aes256-ctr':
            case 'arcfour256':
            case 'twofish-cbc':
            case 'twofish256-cbc':
            case 'twofish256-ctr':
                return 32;
        }
        return null;
    }