c_bind.cpp

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#include "secp256k1.hpp"
 
using namespace bb;
 
// Silencing warnings about reserved identifiers. Fixing would break downstream code that calls our WASM API.
// NOLINTBEGIN(cert-dcl37-c, cert-dcl51-cpp, bugprone-reserved-identifier)
WASM_EXPORT void ecc_secp256k1__mul(uint8_t const* point_buf, uint8_t const* scalar_buf, uint8_t* result)
{
    using serialize::write;
    auto point = from_buffer<secp256k1::g1::affine_element>(point_buf);
    auto scalar = from_buffer<secp256k1::fr>(scalar_buf);
    secp256k1::g1::affine_element r = point * scalar;
    write(result, r);
}
 
WASM_EXPORT void ecc_secp256k1__get_random_scalar_mod_circuit_modulus(uint8_t* result)
{
    secp256k1::fr output = secp256k1::fr::random_element();
    write(result, output);
}
 
WASM_EXPORT void ecc_secp256k1__reduce512_buffer_mod_circuit_modulus(uint8_t* input, uint8_t* result)
{
    auto bigint_input = from_buffer<uint512_t>(input);
 
    uint512_t barretenberg_modulus(secp256k1::fr::modulus);
 
    uint512_t target_output = bigint_input % barretenberg_modulus;
    write(result, target_output.lo);
}
// NOLINTEND(cert-dcl37-c, cert-dcl51-cpp, bugprone-reserved-identifier)