this.generate_key_image = function(tx_pub, view_sec, spend_pub, spend_sec, output_index) {
    if (tx_pub.length !== 64) {
        throw "Invalid tx_pub length";
    }
    if (view_sec.length !== 64) {
        throw "Invalid view_sec length";
    }
    if (spend_pub.length !== 64) {
        throw "Invalid spend_pub length";
    }
    if (spend_sec.length !== 64) {
        throw "Invalid spend_sec length";
    }
    var recv_derivation = this.generate_key_derivation(tx_pub, view_sec);
    var ephemeral_pub = this.derive_public_key(recv_derivation, output_index, spend_pub);
    var ephemeral_sec = this.derive_secret_key(recv_derivation, output_index, spend_sec);
    var k_image = this.generate_key_image_2(ephemeral_pub, ephemeral_sec);
    return {
        ephemeral_pub: ephemeral_pub,
        key_image: k_image
    };
};