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Similar to DES-ECB & CBC but might want to organise it in one class instead of inheriting from base class

Right now rcon values are declared as const array in aes128.h. Add function to calculate rcon values on the go instead of storing them inside of an array.

Markdown docs for ECB and CBC mode

Implement DES in ECB mode.

Currently, the AES algorithm is implemented only in the 128 bit version. Change the implementation so that is works for any version - 128, 192, 256.

Document RSA implementation:

• algorithms used: euclidean and extended euclidean
• steps to calculate variables used in RSA
• libraries used

Implement modes such as ECB, CBC etc in a generic way so that it is not algorithm dependant.

AES in Cipher Feedback mode

Feistel cipher returns values different than in the documentation used: https://page.math.tu-berlin.de/~kant/teaching/hess/krypto-ws2006/des.htm

It shall be checked once again if there's no error

Add PRNG for generating the IV

Implement DES in CBC mode.

Make documentation for modes such as ECB, CBC etc. generic as they work for different algorithms in the same way. This will help to avoid duplicates e.g.: AES-ECB and DES-ECB.

AES in Counter Mode

DES implementation currently uses bitsets. Convert bitsets to uints to simplify the implementation.

AES in Output Feedback mode

Change the implementation of RSA so that the keys generated have hex string format

Fix the preprocessing of messages: 56 bit < message < 64 bit