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//! Modular exponentiation software fallback using aurora-engine-modexp (non-hints, non-zkVM builds only). //! Returns exactly `mod_len` bytes per EIP-198 spec. pub fn modexp(base: &[u8], exp: &[u8], modulus: &[u8]) -> Vec<u8> { aurora_engine_modexp::modexp(base, exp, modulus) }