c - Modular arihmetics in AtMega -


i developing device firmware cryptographic functions. use codevisionavr ide , atmega324 microcontroller. need implement modular exponentiation function this:

unsigned long xpowymodn(unsigned long x, unsigned long y, unsigned long n)

but there no data types bigger long types in codevisionavr! is way implement function without operating numbers more 2^32-1(long)?


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