This project includes a custom Bignum class that supports the arithmetic operations of addition, subtraction, multiplication, division, mod, and modular exponentiation. It also encrypts and decrypts text, using RSA.
After cloning the repo, cd to the build directory and run make then ./bignum op num1 num2. For example,
./bignum "*" 12 334
The supported operators are +, -, "", /, %, and ^ (note the quotation marks around ""). ^ is for modular exponentiation, namely a^b % c, so ./bignum ^ a b c.
To perform encryption run from root directory
g++ -O3 -std=c++2a -Wall -o bignum main.cpp Bignum.cpp && ./bignum e < one.txt
where one.txt is the file of the text you want to encrypt.
For decryption, again run from root directory
g++ -O3 -std=c++2a -Wall -o bignum main.cpp Bignum.cpp && ./bignum d < encrypt_output.txt
where encrypt_output.txt is the output from running encryption (also known as the cipher text, which should look like a large number). You should get the same message back after running decryption.