#PHP版对称加密,python重写的

#对称加密解密
def encrypt(data, key):
    str = base64.b64encode(data.encode(encoding='utf-8'))
    strArr = list(str.decode('utf-8'))
    strCount = len(strArr)
    for k,v in enumerate(key):
        if k<strCount:
            strArr[k] = strArr[k] + v
    return ''.join(strArr).replace('=','O0O0O').replace('+','o000o').replace('/','oo00o')

def decrypt(data, key):
    str = data.replace('O0O0O','=').replace('o000o','+').replace('oo00o','/')
    strArr = re.findall(r'.{2}', str)
    strCount = len(strArr)
    for k,v in enumerate(key):
        if k<=strCount and strArr[k] is not None and strArr[k][1] == v:
            strArr[k] = strArr[k][0]
    return base64.b64decode(''.join(strArr)).decode('utf-8')

class Symmetry
{
    /**
     * 简单对称加密算法之加密
     * @param String $string 需要加密的字串
     * @param String $skey   加密EKY
     * @return String
     */
    public static function encode($string = '', $skey = 'cxphp')
    {
        //先使用 MIME base64 对数据进行编码后的字符串转换为数组
        $strArr   = str_split(base64_encode($string));
        //计算数组中单元数目
        $strCount = count($strArr);
        //拼接上加密KEY
        foreach (str_split($skey) as $key => $value) {
            $key < $strCount && $strArr[$key] .= $value;
        }
        //替换字符返回加密字符串
        return str_replace(array('=', '+', '/'), array('O0O0O', 'o000o', 'oo00o'), join('', $strArr));
    }

    /**
     * 简单对称加密算法之解密
     * @param String $string 需要解密的字串
     * @param String $skey   解密KEY
     * @return String
     */
    public static function decode($string = '', $skey = 'cxphp')
    {
        //反替换字符串,在变为数组
        $strArr   = str_split(str_replace(array('O0O0O', 'o000o', 'oo00o'), array('=', '+', '/'), $string), 2);
        $strCount = count($strArr);
        foreach (str_split($skey) as $key => $value) {
            $key <= $strCount && isset($strArr[$key]) && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];
        }
        return base64_decode(join('', $strArr));
    }
}

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