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add risc0 zone

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Giacomo Pasini 2024-06-19 20:15:59 +02:00
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.DS_Store
Cargo.lock
methods/guest/Cargo.lock
target/

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[workspace]
resolver = "2"
members = ["host", "methods"]
# Always optimize; building and running the guest takes much longer without optimization.
[profile.dev]
opt-level = 3
[profile.release]
debug = 1
lto = true

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# RISC Zero Rust Starter Template
Welcome to the RISC Zero Rust Starter Template! This template is intended to
give you a starting point for building a project using the RISC Zero zkVM.
Throughout the template (including in this README), you'll find comments
labelled `TODO` in places where you'll need to make changes. To better
understand the concepts behind this template, check out the [zkVM
Overview][zkvm-overview].
## Quick Start
First, make sure [rustup] is installed. The
[`rust-toolchain.toml`][rust-toolchain] file will be used by `cargo` to
automatically install the correct version.
To build all methods and execute the method within the zkVM, run the following
command:
```bash
cargo run
```
This is an empty template, and so there is no expected output (until you modify
the code).
### Executing the project locally in development mode
During development, faster iteration upon code changes can be achieved by leveraging [dev-mode], we strongly suggest activating it during your early development phase. Furthermore, you might want to get insights into the execution statistics of your project, and this can be achieved by specifying the environment variable `RUST_LOG="[executor]=info"` before running your project.
Put together, the command to run your project in development mode while getting execution statistics is:
```bash
RUST_LOG="[executor]=info" RISC0_DEV_MODE=1 cargo run
```
### Running proofs remotely on Bonsai
_Note: The Bonsai proving service is still in early Alpha; an API key is
required for access. [Click here to request access][bonsai access]._
If you have access to the URL and API key to Bonsai you can run your proofs
remotely. To prove in Bonsai mode, invoke `cargo run` with two additional
environment variables:
```bash
BONSAI_API_KEY="YOUR_API_KEY" BONSAI_API_URL="BONSAI_URL" cargo run
```
## How to create a project based on this template
Search this template for the string `TODO`, and make the necessary changes to
implement the required feature described by the `TODO` comment. Some of these
changes will be complex, and so we have a number of instructional resources to
assist you in learning how to write your own code for the RISC Zero zkVM:
- The [RISC Zero Developer Docs][dev-docs] is a great place to get started.
- Example projects are available in the [examples folder][examples] of
[`risc0`][risc0-repo] repository.
- Reference documentation is available at [https://docs.rs][docs.rs], including
[`risc0-zkvm`][risc0-zkvm], [`cargo-risczero`][cargo-risczero],
[`risc0-build`][risc0-build], and [others][crates].
## Directory Structure
It is possible to organize the files for these components in various ways.
However, in this starter template we use a standard directory structure for zkVM
applications, which we think is a good starting point for your applications.
```text
project_name
├── Cargo.toml
├── host
│ ├── Cargo.toml
│ └── src
│ └── main.rs <-- [Host code goes here]
└── methods
├── Cargo.toml
├── build.rs
├── guest
│ ├── Cargo.toml
│ └── src
│ └── method_name.rs <-- [Guest code goes here]
└── src
└── lib.rs
```
## Video Tutorial
For a walk-through of how to build with this template, check out this [excerpt
from our workshop at ZK HACK III][zkhack-iii].
## Questions, Feedback, and Collaborations
We'd love to hear from you on [Discord][discord] or [Twitter][twitter].
[bonsai access]: https://bonsai.xyz/apply
[cargo-risczero]: https://docs.rs/cargo-risczero
[crates]: https://github.com/risc0/risc0/blob/main/README.md#rust-binaries
[dev-docs]: https://dev.risczero.com
[dev-mode]: https://dev.risczero.com/api/generating-proofs/dev-mode
[discord]: https://discord.gg/risczero
[docs.rs]: https://docs.rs/releases/search?query=risc0
[examples]: https://github.com/risc0/risc0/tree/main/examples
[risc0-build]: https://docs.rs/risc0-build
[risc0-repo]: https://www.github.com/risc0/risc0
[risc0-zkvm]: https://docs.rs/risc0-zkvm
[rustup]: https://rustup.rs
[rust-toolchain]: rust-toolchain.toml
[twitter]: https://twitter.com/risczero
[zkvm-overview]: https://dev.risczero.com/zkvm
[zkhack-iii]: https://www.youtube.com/watch?v=Yg_BGqj_6lg&list=PLcPzhUaCxlCgig7ofeARMPwQ8vbuD6hC5&index=5

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[package]
name = "host"
version = "0.1.0"
edition = "2021"
[dependencies]
methods = { path = "../methods" }
risc0-zkvm = { version = "1.0.1" }
tracing-subscriber = { version = "0.3", features = ["env-filter"] }
serde = "1.0"

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// These constants represent the RISC-V ELF and the image ID generated by risc0-build.
// The ELF is used for proving and the ID is used for verification.
use methods::{METHOD_ELF, METHOD_ID};
use risc0_zkvm::{default_prover, ExecutorEnv};
use std::collections::BTreeMap;
type Note = BTreeMap<u32, u32>;
fn main() {
// Initialize tracing. In order to view logs, run `RUST_LOG=info cargo run`
tracing_subscriber::fmt()
.with_env_filter(tracing_subscriber::filter::EnvFilter::from_default_env())
.init();
let in_note: BTreeMap<u32, u32> = [(0, 1000)].into_iter().collect();
let in_note_cm = calculate_note_hash(&in_note);
let out_note: BTreeMap<u32, u32> = [(0, 990), (1, 10)].into_iter().collect();
let out_note_cm = calculate_note_hash(&out_note);
let ptx_root = [0u8; 32];
let in_ptx_path: Vec<[u8; 32]> = vec![[0; 32]];
let out_ptx_path: Vec<[u8; 32]> = vec![[0; 32]];
println!("Before: {:?}", in_note);
let from = 0;
let to = 1;
let amount: u32 = 10;
let env = ExecutorEnv::builder()
.write(&ptx_root)
.unwrap()
.write(&in_ptx_path)
.unwrap()
.write(&out_ptx_path)
.unwrap()
.write(&in_note_cm)
.unwrap()
.write(&out_note_cm)
.unwrap()
.write(&from)
.unwrap()
.write(&to)
.unwrap()
.write(&amount)
.unwrap()
.write(&in_note)
.unwrap()
.build()
.unwrap();
// Obtain the default prover.
let prover = default_prover();
// Proof information by proving the specified ELF binary.
// This struct contains the receipt along with statistics about execution of the guest
let opts =
risc0_zkvm::ProverOpts::default().with_receipt_kind(risc0_zkvm::ReceiptKind::Groth16);
let prove_info = prover.prove_with_opts(env, METHOD_ELF, &opts).unwrap();
// extract the receipt.
let receipt = prove_info.receipt;
// TODO: Implement code for retrieving receipt journal here.
// For example:
// let output: BTreeMap<u32, u32> = receipt.journal.decode().unwrap();
// println!("After: {:?}", output);
// The receipt was verified at the end of proving, but the below code is an
// example of how someone else could verify this receipt.
receipt.verify(METHOD_ID).unwrap();
}
fn calculate_note_hash(n: &Note) -> [u8; 32] {
let mut out = [0u8; 32];
out[0] = n.len() as u8;
out
}

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[package]
name = "methods"
version = "0.1.0"
edition = "2021"
[build-dependencies]
risc0-build = { version = "1.0.1" }
[package.metadata.risc0]
methods = ["guest"]

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fn main() {
risc0_build::embed_methods();
}

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[package]
name = "method"
version = "0.1.0"
edition = "2021"
[workspace]
[dependencies]
risc0-zkvm = { version = "1.0.1", default-features = false, features = ['std'] }
blake2 = "0.10"

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use risc0_zkvm::guest::env;
use std::collections::BTreeMap;
/// Public Inputs:
/// * ptx_root: the root of the partial tx merkle tree of inputs/outputs
/// * in_note_cm: a commitment to the input note
/// * out_note_cm: a commitment to the output note
/// Private inputs:
/// * in_note: a note corresponding to the input commitment
/// * in_ptx_path: the path from a leaf containing the input state commitment in the ptx
/// * out_ptx_path: the path from a leaf containing the output state commitment in the ptx
/// * from: u32, the account to transfer from
/// * to: u32, the account to transfer to
/// * amount: u32, the amount to transfer
///
type Note = BTreeMap<u32, u32>;
fn main() {
// public input
let ptx_root: [u8; 32] = env::read();
let in_ptx_path: Vec<[u8; 32]> = env::read();
let out_ptx_path: Vec<[u8; 32]> = env::read();
let in_note_cm: [u8; 32] = env::read();
let out_note_cm: [u8; 32] = env::read();
let from: u32 = env::read();
let to: u32 = env::read();
let amount: u32 = env::read();
// private input
let in_note: Note = env::read();
// check the note is consistent with the state commitment and is part of the path
assert_eq!(in_note_cm, calculate_note_hash(&in_note));
// verify the input state commitment is part of the partial tx
assert!(verify_path(&ptx_root, &in_ptx_path, &in_note));
// the note is just the state
let mut state = in_note.clone();
// compute transfer
let from = state.entry(from).or_insert(0);
*from = from.checked_sub(amount).unwrap();
*state.entry(to).or_insert(0) += amount;
// check that the new state is consistent with the output state commitment and it's part of the output
assert_eq!(calculate_note_hash(&state), out_note_cm);
let out_note = state;
assert!(verify_path(&ptx_root, &out_ptx_path, &out_note));
}
fn calculate_note_hash(n: &Note) -> [u8; 32] {
let mut out = [0u8; 32];
out[0] = n.len() as u8;
out
}
fn verify_path(_ptx_root: &[u8; 32], _ptx_path: &[[u8; 32]], _note: &Note) -> bool {
// for now we just return true
true
}

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include!(concat!(env!("OUT_DIR"), "/methods.rs"));

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[toolchain]
channel = "stable"
components = ["rustfmt", "rust-src"]
profile = "minimal"