Valida VM API

Lita’s Valida zk-VM stack sets a new standard in zero-knowledge proving, leading in speed, efficiency, modularity and development productivity.

See Valida documentation

This crate is a wrapper around valida executable and facilitates usage of valida by providing Rust API for running, proving and verification of Valida programs.

lib.rs:

Valida VM API

Lita’s Valida zk-VM stack sets a new standard in zero-knowledge proving, leading in speed, efficiency, modularity and development productivity.

See Valida documentation

This crate is a wrapper around valida executable and facilitates usage of valida by providing Rust API for running, proving and verification of Valida programs.

Two examples are attached. The first one proves program1. The other one proves program2. Their sources and prebuilt versions are included in the crate in the folder test_data.

program1 reads an integer from stdin, increments it and prints result to stdout.

program2 just unconditionally terminates execution with __valida_builtin_fail().

Example 1

#[cfg(target_arch = "x86_64")]
use valida_vm_api_linux_x86::*;
#[cfg(target_arch = "arm")]
use valida_vm_api_linux_arm::*;
use tempfile::NamedTempFile;
use tmpfile_helper::*;
use std::fs;
use std::path::Path;
use std::default;

fn main() {
  let program = Path::new("test_data").join("program1");

  let valida = create_valida().unwrap();

  // stdin is an ASCII representation of character 'a'
  let stdin = bytes_to_temp_file("a".as_bytes()).unwrap();
  let stdout = NamedTempFile::new().unwrap();

  let run_status = valida.run(
      &program,
      stdout.as_ref(),
      stdin.as_ref(),
      Default::default());

  // Check that program terminated with success, i.e. STOP opcode
  assert_eq!(run_status, RunStatus::TerminatedWithStop);

  let stdout_content = fs::read_to_string(stdout.as_ref()).unwrap();
  // Check that stdout contains ('a' + 1)
  assert_eq!(stdout_content, "b");

  let proof = NamedTempFile::new().unwrap();
  let prove_status = valida.prove(
      &program, proof.as_ref(),
      stdin.as_ref(),
      Default::default(),
      Default::default());

  // Proving of a program that terminates with STOP opcode must succeed
  assert_eq!(prove_status, ProveStatus::Success);

  let verify_status_correct_statement = valida.verify(
      &program,
      proof.as_ref(),
      stdout.as_ref(),
      Default::default(),
      Default::default());

  // Verification of a program that terminates with STOP opcode and outputs 'b' must succeed
  assert_eq!(verify_status_correct_statement, VerifyStatus::Success);

  let incorrect_stdout = bytes_to_temp_file("c".as_bytes()).unwrap();
  let verify_status_incorrect_statement = valida.verify(
      &program,
      proof.as_ref(),
      incorrect_stdout.as_ref(),
      Default::default(),
      Default::default());

  // Verification of a program that terminates with STOP opcode
  // and outputs something else than `b` must fail
  assert_eq!(verify_status_incorrect_statement, VerifyStatus::Failure);
}

Example 2

#[cfg(target_arch = "x86_64")]
use valida_vm_api_linux_x86::*;
#[cfg(target_arch = "arm")]
use valida_vm_api_linux_arm::*;
use tempfile::NamedTempFile;
use tmpfile_helper::*;
use std::fs;
use std::path::Path;
use std::default;

fn main() {
  let program = Path::new("test_data").join("program2");

  let valida = create_valida().unwrap();

  // stdin and stdout do not matter for this program
  let stdin = bytes_to_temp_file("".as_bytes()).unwrap();
  let stdout = NamedTempFile::new().unwrap();

  let run_status = valida.run(
      &program,
      stdout.as_ref(),
      stdin.as_ref(),
      Default::default());

  // Check that program terminated with failure, i.e. FAIL opcode
  assert_eq!(run_status, RunStatus::TerminatedWithFail);

  let proof = NamedTempFile::new().unwrap();
  let prove_status = valida.prove(
      &program,
      proof.as_ref(),
      stdin.as_ref(),
      Default::default(),
      Default::default());

  // Proving of a program that terminates with STOP opcode may succeed
  assert!(prove_status == ProveStatus::Success || prove_status == ProveStatus::Failure);

  let verify_status = valida.verify(
      &program,
      proof.as_ref(),
      stdout.as_ref(),
      Default::default(),
      Default::default());

  // Verification of a program that terminates with FAIL opcode must fail
  assert_eq!(verify_status, VerifyStatus::Failure);
}