Computing big numbers

Hi, im new in this group and i hope my question can be new too (i doubt
that) , im implementing a big number library , i have made sums and
multiplications with big numbers.
i need to do this for a microcontroler to have the ability of
public-key algorithms.
maybe discret log , i would like to implement modulus , i can implement
my current work without modulus... but it will be better and ill
restrict my bandwidth if i make this. but im having problems , does
anybody know a good starting website or how can i search in google for
big number arithmetic in computers, i have search , but with no
success, GMP is a little complex to understand , and if i made
multuplication and sum smaller than GMP i think modulus will be much
smaller

Thanks

.

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