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ixnar  ·  4570 days ago  ·  link  ·    ·  parent  ·  post: A simple hexadecimal "bignum" library, in C.

Have you tried GNU MP? It computes stuff in binary as you'd expect (well, in 32- or 64-bit words), from which you can build your hex strings. It's written in C and there's a C++ wrapper with friendly operator overloading if that's your thing.