Function GenerateOutputRangeproofNonce

src/blind.cpp:234–247

Creates ECDH nonce commitment using ephemeral key and output_pubkey

// Creates ECDH nonce commitment using ephemeral key and output_pubkey
uint256 GenerateOutputRangeproofNonce(CTxOut& out, const CPubKey output_pubkey)
{
    // Generate ephemeral key for ECDH nonce generation
    CKey ephemeral_key;
    ephemeral_key.MakeNewKey(true);
    CPubKey ephemeral_pubkey = ephemeral_key.GetPubKey();
    assert(ephemeral_pubkey.size() == CConfidentialNonce::nCommittedSize);
    out.nNonce.vchCommitment.resize(ephemeral_pubkey.size());
    memcpy(&out.nNonce.vchCommitment[0], &ephemeral_pubkey[0], ephemeral_pubkey.size());
    // Generate nonce
    uint256 nonce = ephemeral_key.ECDH(output_pubkey);
    CSHA256().Write(nonce.begin(), 32).Finalize(nonce.begin());
    return nonce;
}

bool GenerateRangeproof(std::vector<unsigned char>& rangeproof, const std::vector<unsigned char*>& value_blindptrs, const uint256& nonce, const CAmount amount, const CScript& scriptPubKey, const secp256k1_pedersen_commitment& value_commit, const secp256k1_generator& gen, const CAsset& asset, std::vector<const unsigned char*>& asset_blindptrs)
{