Design question

[Voronkov Konstantin]

Hello All!   I have design quesion about using cipher modes and block ciphers.   I need to enumerate cipher modes and block ciphers. E.g. Alice encrypts  message, she uses CFB algoritghm and AES cipher. I want to save some CFB id and AES id and append it to message. Then B wants to decrypt message. I'm about to use something like this:   switch(mode) {   case CBC: {     case DES: {        CFB_Mode<DES>::Decryption cfbE(key, DES::DEFAULT_KEYLENGTH, iv);        ...     }     case AES: {        CFB_Mode<AES>::Decryption cfbE(key, AES::DEFAULT_KEYLENGTH, iv);        ...     }     ...   }   case CFB: {     case DES: {        CFB_Mode<DES>::Decryption cfbE(key, DES::DEFAULT_KEYLENGTH, iv);        ...     }     case AES: {        CFB_Mode<AES>::Decryption cfbE(key, AES::DEFAULT_KEYLENGTH, iv);        ...     }     ...   }   ... }   I feel there is some way to avoid this terrible swithes, but structure of CryptoPP  is bit complicated for me, and I can not understand how to solve my task without such switched.   Can you hint how to solve my task with CryptoPP library, please?   Best Regards, Voronkov Konstantin