zkm2.rs

/*
To implement a zero-knowledge proof as an API in Rust, you can use the following steps:

Install the necessary Rust dependencies, such as the bellman crate for 
implementing zero-knowledge proofs and the actix-web crate for creating the API.

Define the data structures and algorithms for the specific zero-knowledge proof
 that you want to implement. 
This will vary depending on the proof, but it could include structures 
for representing the statement and the secret,
 and algorithms for generating a proof and verifying it.

Implement the API endpoints for generating and verifying the zero-knowledge proof.
 For example, you could create a /generate-proof endpoint that takes the statement
  and the secret as input and returns the proof,
   and a /verify-proof endpoint that takes the statement, 
   the proof, and a public verification key as input and 
   returns a boolean indicating whether the proof is valid.

Use the actix-web crate to define the routes for each endpoint 
and specify the HTTP methods that are allowed (e.g. GET, POST).

Test the API using a tool like Postman to ensure that the endpoints are working as
 expected and that the zero-knowledge proof is being generated and verified correctly.

Here is an example of what the code for the zero-knowledge proof API might look like:

*/

extern crate actix_web;
extern crate bellman;

use actix_web::{web, App, HttpResponse, HttpServer, Result};
use bellman::groth16::{
    create_random_proof, generate_random_parameters, prepare_verifying_key, verify_proof,
};
use bellman::pairing::bls12_381::{Bls12, Fr};
use std::collections::HashMap;

// Define the data structures and algorithms

#[derive(Debug)]
struct Statement {
    // Define the fields for the statement here
}

#[derive(Debug)]
struct Secret {
    // Define the fields for the secret here
}

#[derive(Debug)]
struct Proof {
    // Define the fields for the proof here
}

fn generate_proof(statement: web::Json<Statement>, secret: web::Json<Secret>) -> Result<HttpResponse> {
    // Generate a proof for the given statement and secret

    let statement = statement.into_inner();
    let secret = secret.into_inner();

    let params = generate_random_parameters::<Bls12, _, _>(statement, secret).unwrap();
    let proof = create_random_proof(statement, &params, secret).unwrap();

    Ok(HttpResponse::Ok().json(proof))
}

fn verify_proof(
    statement: web::Json<Statement>,
    proof: web::Json<Proof>,
    data: web::Data<HashMap<String, Vec<u8>>>,
) -> Result<HttpResponse> {
    // Verify the given proof for the given statement

    let statement = statement.into_inner();
    let proof = proof.into_inner();

    let pvk = prepare_verifying_key(&data.lock().unwrap());
    let is_valid = verify_proof(statement, &proof, &pvk).unwrap();

    Ok(HttpResponse)}
// Define the API routes

fn main() -> std::io::Result<()> {
    let public_verification_key = web::Data::new(HashMap::new());

    HttpServer::new(move || {
        App::new()
            .register_data(public_verification_key.clone())
            .route("/generate-proof", web::post().to(generate_proof))
            .route("/verify-proof", web::post().to(verify_proof))
    })
    .bind("127.0.0.1:8080")?
    .run()
}