Add BigInteger support for EC arithmetic - #14
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Restructure all EC arithmetic functions to work with both int and BigInteger moduli. This enables compilation for 256-bit primes. Key changes: - to_montgomery/to_standard: accept Python int p_int directly - inpl_rsub: accept Python int p_int, extract concrete modulus from aux_data - kaliski_mod_inv: p is static Python int, _mk_bi only for QuantumModulus - q_ec_add_inpl: extract concrete modulus via _p_int for classical ops - Add _p_int() and _bi() helpers for BigInteger/int interop - Add BigInteger test cases (k=1,2,3) using boolean_simulation
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Summary
Add BigInteger support for the elliptic-curve arithmetic integration.
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Notes
This PR is opened from the current committed branch state only.
Local uncommitted work was intentionally left out.