124 lines
3.3 KiB
Markdown
124 lines
3.3 KiB
Markdown
# zkUtil  [](https://crates.io/crates/zkutil)
|
|
|
|
A tool to work with zkSNARK circuits generated by circom compiler. Based on circom import code by @kobigurk
|
|
|
|
**The generated keys are currently incompatible with upstream Websnark and require using a custom fork**
|
|
|
|
## Usage examples:
|
|
|
|
```shell script
|
|
# Getting help
|
|
> zkutil --help
|
|
zkutil
|
|
A tool to work with SNARK circuits generated by circom
|
|
|
|
USAGE:
|
|
zkutil <SUBCOMMAND>
|
|
|
|
FLAGS:
|
|
-h, --help Prints help information
|
|
-V, --version Prints version information
|
|
|
|
SUBCOMMANDS:
|
|
export-keys Export proving and verifying keys compatible with snarkjs/websnark
|
|
generate-verifier Generate verifier smart contract
|
|
help Prints this message or the help of the given subcommand(s)
|
|
prove Generate a SNARK proof
|
|
setup Generate trusted setup parameters
|
|
verify Verify a SNARK proof
|
|
|
|
# Getting help for a subcommand
|
|
> zkutil prove --help
|
|
zkutil-prove
|
|
Generate a SNARK proof
|
|
|
|
USAGE:
|
|
zkutil prove [OPTIONS]
|
|
|
|
FLAGS:
|
|
-h, --help Prints help information
|
|
-V, --version Prints version information
|
|
|
|
OPTIONS:
|
|
-c, --circuit <circuit> Circuit R1CS or JSON file [default: circuit.r1cs]
|
|
-p, --params <params> Snark trusted setup parameters file [default: params.bin]
|
|
-r, --proof <proof> Output file for proof JSON [default: proof.json]
|
|
-i, --public <public> Output file for public inputs JSON [default: public.json]
|
|
-w, --witness <witness> Witness JSON file [default: witness.json]
|
|
|
|
# Suppose we have circuit file and a sample inputs
|
|
> ls
|
|
circuit.circom input.json
|
|
|
|
# Compile the circuit
|
|
> circom -rw circuit.circom
|
|
Constraints: 10000
|
|
Constraints: 20000
|
|
Constraints: 30000
|
|
Constraints: 40000
|
|
Constraints: 50000
|
|
|
|
# Generate a local trusted setup
|
|
> zkutil setup
|
|
Loading circuit...
|
|
Generating trusted setup parameters...
|
|
Has generated 28296 points
|
|
Writing to file...
|
|
Done!
|
|
|
|
# Calculate witness from the input.json
|
|
# At the moment we still need to calculate witness using snarkjs
|
|
> snarkjs calculatewitness
|
|
|
|
# Generate a snark proof
|
|
> zkutil prove
|
|
Loading circuit...
|
|
Proving...
|
|
Saved proof.json and public.json
|
|
|
|
# Verify the proof
|
|
> zkutil verify
|
|
Proof is correct
|
|
|
|
# Generate a solidity verifier contract
|
|
> zkutil generate-verifier
|
|
Created verifier.sol
|
|
|
|
# Export keys to snarkjs/websnark compatible format
|
|
> zkutil export-keys
|
|
Exporting params.bin...
|
|
Created proving_key.json and verification_key.json
|
|
|
|
# Verify the same proof with snarkjs
|
|
> snarkjs verify
|
|
OK
|
|
|
|
# Here's a list of files that we have after this
|
|
> ls
|
|
circuit.circom circuit.r1cs circuit.wasm input.json params.bin proof.json public.json Verifier.sol proving_key.json verifying_key.json witness.json
|
|
```
|
|
|
|
Also see `test.sh` for example
|
|
|
|
# Installation
|
|
|
|
Install Rust
|
|
|
|
```shell script
|
|
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
|
|
```
|
|
|
|
Install zkutil globally
|
|
|
|
```shell script
|
|
cargo install zkutil
|
|
# Make sure `~/.cargo/bin` is in $PATH (should be added automatically during Rust installation)
|
|
```
|
|
|
|
Or alternatively you can compile and run it instead:
|
|
|
|
```shell script
|
|
git clone https://github.com/poma/zkutil
|
|
cd zkutil
|
|
cargo run --release -- prove --help
|
|
``` |